Part I: Construction sequence of cover culvert: survey and setting out → trench excavation → box culvert bottom plate → side wall masonry → cover concrete pouring → manhole masonry → box culvert backfilling.
Reinforced concrete soil foundation
(1) Construction method: steel bars are made in the workshop with supporting professional machines and tools, and the skeleton is bound in place; In the bottom plate, the rebar with d≥22mm shall be mechanically connected, and the rebar with D < 22mm shall be connected by flash welding or lap welding. The formwork consists of composite steel formwork, finished release agent, steel pipe and square steel bar. Concrete is produced centrally in the mixing station, transported by electric hopper, manually put into the mould, and compacted by vibrator and plate vibrator.
(2) Process flow
Measuring and positioning alignment → concrete cushion → measuring and positioning alignment → binding and welding steel skeleton → formwork erection → pouring concrete → covering and watering maintenance → formwork removal maintenance → backfilling soil.
(3) Key points of construction
After inspection by the supervisor, such as slot inspection, line inspection, elevation inspection, witness to the second interview sheet of various materials, concrete mixture ratio and template, steel skeleton and protective layer, embedded column steel dowel, etc. , reach the standard before pouring concrete. Template reinforcement, the size meets the requirements of the drawings. When the concrete reaches the strength required by the specification, the formwork can be removed, and plastic film or straw bag should be covered before and after formwork removal for maintenance. Ф16 or more steel bar supports (@ @ 1.0m, plum blossom arrangement) shall be arranged between double-layer steel bars of foundation slab to ensure the position of upper and lower steel bars. Column steel dowel is spot-welded into skeleton with closed stirrup in advance, the lower closed hoop is welded and positioned with foundation reinforcement, and the upper end is fixed with steel pipe hanger to ensure accurate and firm positioning.
Cover plate construction method
The cover plate was originally designed as a precast reinforced concrete slab with a width of 1 m. In order to speed up the construction period, the cast-in-place concrete slab is proposed for this project.
The slab culvert is provided with a vertical expansion joint every 20 meters. Concrete columns are set on both sides of the expansion joint, and rubber waterstops are embedded in the columns. The cover plate reinforcement is made in a processing factory with supporting professional machines and tools, and the skeleton is bound in place. Formwork is made of plastic-coated bamboo plywood (12 and 18mm thick), which is mechanically installed and removed; Roof formwork support adopts wheel-buckle or bowl-buckle steel pipe scaffold. Concrete is produced in mixing station, transported by concrete mixer, pumped and poured; The roof and constructional column shall be vibrated by vibrator, flat vibrator and attached vibrator. The pouring interval of adjacent plates shall not be less than 3 days.
Reinforcement engineering: the vertical reinforcement joints of columns should be located on two sections with a spacing of ≮ 60 cm; Connecting covered electrode: E43 15, 16,18,28 covered electrode for first-class reinforcement, E50 15, 16,18,28 covered electrode for second-class and second-class and first-class reinforcement. When binding, the wires at the adjacent binding points are buckled into a figure of eight; Reinforcing horse stool support (φ 14, @ @ 1m, plum blossom layout) is set between double-layer reinforcing steel mesh pieces to ensure the correct position; Use mortar with the same proportion as concrete as cushion block to control the protective layer of steel bar, and there shall be no negative difference. It is forbidden to pad steel bars.
(3) Formwork project: adopt high-strength plastic-coated bamboo plywood formwork, calculate the distance between the square timber belt and the steel tie rod, and ensure the strength, rigidity and reinforcement of the formwork; Template demolition time must conform to the requirements of the specification, it is forbidden to use a sledgehammer or crowbar hard hit hard pry; Dismantled templates, accessories, etc. It is forbidden to throw, pile up in the designated place, and clean, maintain and apply isolation agent in time for reuse.
④ Concrete engineering: According to the design strength, impermeability grade and materials used on site, the waterproof concrete with admixture is scientifically designed and tested by the "absolute volume method"; Cement dosage ≮300kg/m3, suitable water-cement ratio 0.5 ~ 0.6, sand ratio 28 ~ 38%, lime-sand ratio 1.5 ~ 2.5, and mixed sand-gravel mass density > 2000 kg/m3; Admixtures should be dense, waterproof, water reducing agent, air entraining agent and expansion agent. Depending on the situation, the dose should be determined by experiments; Weigh the ingredients in strict accordance with the construction ratio; When mixing concrete, first mix sand, stone and cement for 0.5 ~ 1.0 min, then add water to mix 1.5 ~ 2.5 min, and finally add additives diluted with water to mix1.5 ~ 2.5 min; Before pouring, the accumulated water, sawdust and other sundries in the formwork should be cleaned up and moistened with water; Wall construction joints should be chiseled before the formwork is erected to expose stones, remove laitance and soft layer, wet before pouring concrete, spread mortar in the same proportion as concrete, and remove stones with a thickness of 2.5cm；; When the drop of pouring concrete for constructional column exceeds 2.0m, open the window with string tube, chute or template; After the initial setting of the protective layer concrete, press the light with an iron trowel to increase the surface compactness; Concrete is not easy to be compacted in real time in embedded parts or dense steel bars, so fine stone concrete is used and the compaction is strengthened with chip vibrator head; After concrete pouring, water and wet curing shall not be less than 14d. Make waterproof concrete inspection specimens and control specimens as required.
Part II: Construction scheme of slab culvert 1. General situation of the project:
This culvert is a reinforced concrete slab culvert, with the central pile number K6 1+69 1, the intersection angle of 45 degrees, the span of 4m, the clear height of 3m, the culvert length of 47.42m, and the retaining wall at the entrance and exit.
Second, the planned construction period
Planned commencement date: June 25th, 20 10,
Planned completion date: July 30th * *.
Third, the main materials
Prefabricated round tube and cover plate are used.
Four, the main construction methods and technology
(a), construction preparation and lofting
Before construction, check the setting-out according to the design drawings, and check whether the location of the new culvert is correct and whether the geological conditions are consistent with those described in the design drawings in combination with the actual situation on site, so as to avoid unnecessary influence on the overall index of the structure due to the inconsistency of elevation, location and geological conditions.
Before the formal construction, remove the vegetation and attachments on the foundation. After the demolition, the foundation shall be positioned and set out according to the position of the designed slab culvert and passage.
(2), foundation pit excavation
Excavate according to the excavation line of foundation pit released by surveyors (slope gradient is determined according to soil quality and excavation depth). Generally, dig 0.5 ~ 1.0m more on each side. Mechanical excavation is adopted for excavation, and dump trucks are transported to the spoil ground. If the foundation pit is deeply excavated, it shall be excavated step by step, and when it is away from the basement 15cm, it shall be manually cleaned to the design elevation to prevent disturbing the basement and overbreak. Drainage ditches and collecting wells are set around the foundation pit, and the accumulated water in the foundation pit is pumped out of the foundation pit in time to ensure that the basement is not soaked by water. After the foundation pit excavation is completed, check whether the bearing capacity of the basement meets the design and specification requirements. If it does not meet the design requirements or is inconsistent with the design, it should be reported to the relevant departments in time for proper handling. After meeting the requirements, the foundation construction of the next working procedure can be carried out.
(3), foundation construction
After the inspection of foundation pit excavation, the surveyors will release the foundation line, set up the formwork and use the steel formwork. Template should be solid, joint tight and smooth, and measure the marker line of foundation concrete pouring height. There shall be no water and sundries in the foundation pit. After the foundation formwork is supported, before pouring the foundation concrete, the release agent should be painted in time and the bottom surface of the foundation should be wetted with clear water. When pouring foundation concrete, if the pouring height is more than 2m, it should fall through the string tube or chute facilities, and the pouring thickness of each layer should be controlled within 30cm. Below the discharge port, the concrete stacking height shall not exceed1m. Concrete is mixed by concrete mixing station and transported by concrete truck. The chute or crane is hoisted into the mould, and the concrete is vibrated by the internal vibrator. Avoid excessive vibration or vibration leakage, and ensure that the exposed surface of concrete is smooth, flat and beautiful. Sprinkle water for health preservation in time after formwork removal, not less than 7 days. After the foundation strength reaches the formwork removal strength, the formwork should be removed immediately, and the formwork should be tapped lightly to avoid damaging the main concrete or scratching the concrete surface.
(4), the main construction
After the foundation concrete construction is completed and the concrete reaches a certain strength, the platform body construction will be carried out, the platform body position line will pop up, the foundation surface laitance at the platform body position will be manually chiseled, cleaned and rinsed, and then the platform body template will be erected. The formwork is supported by steel formwork and steel pipe scaffold. When erecting wall formwork, the scaffold must be supported on the ground with sufficient bearing capacity to prevent the scaffold from sinking and the concrete structure from deforming. Formwork support should be firm and stable, and joints should be tight and smooth. The flatness and verticality of formwork support must meet the specification requirements. After the formwork is erected, check the flatness, verticality and geometric dimensions of the formwork according to the specification requirements.
When pouring concrete, assign special personnel to look after the formwork to prevent slurry leakage and formwork leakage. Concrete is mixed by concrete mixing station and transported by concrete truck. Transport vertically by crane, put the cylinders in the mould one after the other, and pour them in layers, with the thickness of each layer controlled within 30cm. When vibrating, the vibrating rod should be inserted into the lower layer by 5 ~ 10 cm, so as to ensure the good combination of the upper and lower layers of concrete, and it is forbidden to vibrate excessively or leak vibration, so as to ensure that the concrete is light outside and solid inside. After the completion of concrete pouring, the concrete should be cured as soon as possible after the surface mud is collected. Sprinkle water in time after form removal to ensure the humidity of concrete curing and the quality of concrete. According to the design requirements of drawings, a settlement joint is set every 4 ~ 6mm. The settlement joint is lined with 2cm thick asphalt pine board and 2cm wide. The settlement joint is filled to the depth of 10cm with asphalt plug and slotted with 2cm thick 15 cement mortar.
(5), pile cap construction
The steel bars used in the capping cap are cut, processed and bound in the steel bar workshop. After passing the self-inspection, report to the supervision engineer for signature and change the order. When shuttering, the clear distance between two back walls should be accurately measured, so that the hollow slab can be hoisted smoothly. Then the formwork is erected, the concrete is transported vertically by crane, and the concrete is poured from one end to the other at one time.
(6), protective layer construction
1. Cast-in-situ reinforced concrete is adopted, and concrete is mixed centrally. All the concrete is supplied by the mixing station, and the concrete is directly poured after being transported in place by the truck.
2. Cast-in-place formwork for cover plate adopts steel formwork, and steel pipe support scheme is adopted for support.
3. The protective layer reinforcement is uniformly processed and formed in the processing shed, and then pulled to the site for installation. The processing and installation of steel bars shall comply with the relevant requirements of Technical Specification for Construction of Highway Bridges and Culverts (JTJ04 1-2000). Protective layer reinforcement should focus on controlling the length of main reinforcement, the thickness of protective layer of main reinforcement, the position and spacing of reinforcement in diagonal reinforcement area.
4. Before pouring the cover concrete, check the supports, scaffolding, templates, steel bars, etc. Before pouring. Debris, water and dirt on the steel bars in the formwork should be cleaned up. If there is any gap in the template, immediately fill it tightly, and whether the internal surface of the template is coated with release agent and uniform. If it's not painted, make up the brush immediately.
5. Pouring should be carried out continuously, avoiding construction joints, and the construction section should be located at the settlement joint of culvert.
6. When pouring concrete, insert vibrator for vibrating compaction. When the plug-in vibrator vibrates, its moving distance should not exceed 1.5 times of the action radius of the vibrator, and pay attention to keeping a distance of 50 ~ 100 mm from the side formwork; After each vibration, the vibrator should be slowly raised while vibrating; When vibrating, the vibrator should avoid colliding with the formwork, steel bars and other pretreatment parts; For each vibrating part, the concrete must be vibrated to stop sinking, no bubbles will appear, and the surface will be smooth and pulpy. Then use a surface vibrator to vibrate the cover plate, and control the vibrator plate to cover the vibrating part about 10cm in real time to avoid vibration leakage.
(7), ancillary works construction
The retaining wall at the entrance and exit and the paving at the entrance shall be constructed according to the description of design drawings and the requirements of construction specifications. The retaining wall is paved with 7.5 mortar rubble at the entrance. The strength of the mortar used shall meet the label specified in the design, and the cement, sand and water used shall meet the quality requirements of the specification. There should be a weighbridge on site, and the amount of sand used each time must be determined by the weighbridge. Mortar mixing water is the domestic drinking water for site construction personnel. Mortar shall be mechanically stirred and mixed as required to maintain proper fluidity. Generally used within 3 ~ 4 hours; When the temperature exceeds 30℃, use it within 2 ~ 3 hours; Mortar that segregates and bleeds during long-distance transportation or storage should be re-stirred before masonry; Solidified mortar shall not be used.
It is necessary to ensure the smooth connection between culvert body and trench bed, and to ensure the smooth flow of upstream and downstream water. The gap between the culvert retaining wall and the tunnel body should be filled with asphalt batting and caulked with 1:2 cement mortar.
(9) Concrete pouring requirements
1. Concrete mixing: According to the test data, concrete is mixed, and the mixed concrete has suitable slump and workability.
2. Concrete transportation: transport by truck or other means, no matter which way is adopted, the workability of concrete is guaranteed, segregation is not allowed, and the slump of concrete is detected at any time during pouring.
3. Pouring: The pouring concrete should be horizontally layered at one time, and the thickness of the pouring layer should be controlled within 30cm. The upper concrete shall be poured before the initial setting of the lower concrete, and the first concrete shall be vibrated immediately. The vibrator is inserted into the lower concrete for 5 ~ 10 cm at a time to ensure the close combination of the upper and lower concrete, the compactness of the concrete and the smoothness of the surface. The head of the vibrator shall not collide with the formwork, and keep a distance of 5 ~ 10 cm from the side wall of the formwork to prevent the formwork from loosening, shifting and deformation due to collision.
4. Concrete pouring records should be made in the pouring process, and concrete specimens should be made according to regulations, and the supervision engineer should conduct spot checks on the specimens before further notice. Samples shall be made and maintained as required.
5, demolition, maintenance:
(1), after the completion of concrete pouring, the surface should be cured as soon as possible after the slurry is collected, and the water should be sprayed for at least 7 days, and the top surface should be covered with sacks to keep wet. Sprinkle water in time after form removal to ensure the humidity and quality of concrete curing.
(2) Before the strength of concrete reaches 2.5Mp during the curing period, it shall not bear the load of pedestrians and means of transport.
(3) After the foundation strength reaches the formwork removal strength, the formwork shall be removed immediately and tapped lightly to avoid damaging the main concrete or scratching the concrete surface.
Verb (abbreviation of verb) safe production
(a), designated persons on-site safety.
Establish and improve the responsibility system for production safety, clarify their respective job responsibilities, and designate special personnel to be responsible for site safety during construction.
(2), steel bar operation safety operation points
1, unfold the round bar into a card to prevent rebound.
2. When the steel bar is straightened, the fixture should be fastened and the ground anchor should be stable. Personnel are prohibited from passing through the 2m-wide area along the lacing. When using the grinder, it is not allowed to touch the push rod with the chest and abdomen, and loosen it slowly, and it is not allowed to loosen it at one time.
3, reinforced pile should be scattered, neat, avoid the heap and pressure.
4. When cutting with a cutting machine, the load capacity of the machine cannot be exceeded. When the moving blade moves forward, it is forbidden to feed, and the distance between the hand and the blade shall not be less than 15cm.
5. Wear masks and gloves when using rust remover to remove rust. It is forbidden to remove the rust on the steel bar of the hook.
6. When bending the long steel bar on the machine, someone should hold it and stand outside the bending direction. When you turn around and bend over, you should prevent people and things from colliding.
7. When straightening steel bars, it is forbidden to adjust the rollers and wear gloves during the operation of the machine. When adjusting to the end, personnel must avoid it to prevent the steel bar from shaking and hurting people.
8, binding wall, column reinforcement should build homework shelf, shall not stand on the steel skeleton or climb up and down the steel skeleton.
9, tall steel skeleton should be fixed with temporary support to prevent dumping.
(3), the specific operation safety operation points
1, conduit and string pipe joint must be firmly connected. When pouring concrete, no one is allowed to enter within 2m of the orifice.
2. The hopper door of concrete hopper must be closed and fastened before loading and lifting, so as to prevent it from being pushed open and dumped during lifting.
3. In the process of digging a hole, if the soil water content around the pile hole is high and there is quicksand, straw should be inserted into the steel bar to prevent the sediment from flowing out. If the water seepage is serious, steel bars can be driven around the retaining wall to avoid collapse around the pile hole.
4. When pouring beams and columns, an operation console should be set up, and it is not allowed to stand on the formwork or support.
5. Corresponding protective (inspection) measures should be taken for dumping operations that are in danger of dumping and falling.
6, when using vibrator should wear rubber shoes, wet hands shall not touch the switch, the power cord can not have broken skin leakage.
7, found in the vibration template bulge, deformation should immediately stop operation and processing.
(4), electricity safety points
1, it is forbidden to connect or disconnect with load, and it is forbidden to operate with electricity.
2. Don't pull wires or install electrical equipment without permission.
3, the electrical equipment to reliable grounding, electrical switch to install distribution box, and leakage protector, hold people accountable.
4, someone get an electric shock, should immediately cut off the power supply, first aid.
5, electrical fire, should immediately cut off the power supply, use foam extinguisher or dry sand to put out the fire.
6, cables and other electrical equipment such as aging should be replaced in time.
(5), welding machine safety operation procedures
1, welding machine shell must be well grounded, welding machine should be equipped with a separate switch, electrode holder and wire must be well insulated and firmly connected.
2. It is forbidden to weld containers and pipelines under pressure. When welding live equipment, the power supply must be cut off. When welding containers and pipelines with flammable, explosive and toxic substances, they should be cleaned first and all orifices should be opened. When welding in a wet place, you should stand on an insulating board or a wooden board.
3, wire, ground wire contact with wire rope is prohibited, wire rope and mechanical and electrical equipment shall not be used instead of the zero line, all ground wire joints must be firmly connected.
4. Wear protective glasses or a mask when removing welding slag.
5. When multiple welders are welded together, the welding platform or weldment must be grounded, and a light shield is set.
6. Open-air welding operation should be stopped during thunderstorm.
7, before welding in flammable and explosive gas or liquid diffusion area, must obtain the permission of the relevant departments.
8, when welding, should remove the surrounding flammable items or reliable coverage, isolation. After welding, cut off the power supply of the welding machine, check the operation site and confirm that there is no fire danger before leaving.
(6), aerial work, scaffolding operation safety operation points
1. Operators on the shelf must fasten their seat belts and stand firm.
2. Before setting the first row of wall-connected pieces, throw braces should be set appropriately to ensure the stability of the shelf and the safety of workers on the shelf.
3. When transferring and placing bars on the shelf, attention should be paid to prevent imbalance.
4, the installation of heavy bar or poor working conditions, should avoid single operation alone.
5, bracing, wall parts and other integral Rachel bars should be fashionable with the increase of shelf height to ensure the stability of the whole shelf.
6, on the way to the erection, the shelf shall not be concentrated (overload) stacked bar materials.
7, the erection should be unified command and coordination.
8, to ensure that the size of the frame, the verticality and levelness of the bar, node structure and fastening degree meet the design requirements.
9. It is forbidden to use bars whose materials, specifications and defects do not meet the requirements.
10, according to the opposite procedure for erection and demolition work.
1 1. The wall part of each floor must be removed after all the detachable bars on it are removed. It is forbidden to loosen the wall first.
12, all loose bars must be taken out and put down in time, so as to avoid danger caused by wrong support or wrong leaning.
13, remove the bar and scaffolding should be lifted to the ground in time, it is forbidden to throw down from the shelf.
14, aerial work must wear safety helmet, fasten your seat belt, and the seat belt must be fastened to a solid structure.
(7), template operation safety operation points
1. Unqualified formwork, steel bars, connectors and supports shall not be used.
2, according to the shuttering process, before the model is not connected and fixed, temporary support should be set to prevent the formwork from toppling.
3, tall shuttering operation should have safe operation shelf, it is forbidden to use tie rods and support climbing up and down.
4, it is forbidden to stand on the mould operation or walking on the beam mould.
5, the template must be set firmly, reliable connection.
6. The time for dismantling the formwork shall be approved by the construction technicians.
7, demolition must be carried out in order, it is strictly prohibited to pry, hard hit or pry down, pull down.
8, remove the template should be shipped out in a timely manner to focus on stacking, to prevent the nail prick the foot.
9, demolition of beam slab, template, should be added in accordance with the provisions, top bracing.
(8), gas welding safety operation procedures
1. Flammable and explosive articles shall be removed or isolated and covered around the welding site.
2. Welding in the diffusion area of flammable and explosive gas or liquid shall be approved by relevant departments.
3. The acetylene generator must be equipped with safety devices and safety chains to prevent backfire, and the spherical floating barrel must have explosion-proof balls. The thickness of rubber film on the floating barrel should be1~1.5mm, and the area should not be less than 60% ~ 70% of the cross-sectional area of the floating barrel.
4, acetylene generator parts and pipe fittings shall not be made of copper, shall not be directly placed under wires, shall not be placed in the same place with oxygen cylinders, and the distance from flammable, explosive and open flames shall not be less than 10m. Soap water and open flame are strictly prohibited in gas leakage inspection.
5. Oxygen cylinders, oxygen meters and cutting and welding tools are strictly prohibited from being contaminated with grease.
6, oxygen cylinders should have shockproof apron, fastening safety helmet, avoid collision and violent vibration, prevent exposure.
7. When oxygen cylinders, acetylene hoses and backfire prevention safety devices are frozen, they should be thawed with hot water or steam, and baking with fire is strictly prohibited.
8. When igniting, the gun shall not be pointed at people, and the burning torch shall not be placed on the workpiece or on the ground. When carrying acetylene and oxygen, it is not allowed to put it in a metal container to prevent gas from escaping and causing a combustion accident.
9. After the work, the oxygen cylinder valve should be closed, the safety cover should be screwed on, and the acetylene generator should be packed in accordance with the regulations. Only after checking the site and confirming that there is no fire danger can you leave.
Six, quality assurance measures
1, establish and improve the quality assurance system
Project intends to set up a quality management leading group, headed by the project manager, with the chief engineer and the construction section chief as deputy heads, and members composed of leaders in charge of various businesses. The project intends to set up full-time quality inspection engineers, and the team will set up full-time quality inspectors. Quality management cadres and quality inspectors at all levels will keep track of the work, find existing problems in time, hold regular quality analysis meetings, study and formulate improvement measures, listen to the opinions of construction, design and supervision engineers with an open mind, correct them in time, and further promote and improve quality management.
2. Improve the quality awareness of all employees.
Engineering quality includes product quality, process quality and construction quality, which are closely related. Engineering quality is the final result of construction activities, which depends on the process quality, while working quality is the guarantee and foundation of process quality and engineering quality, and engineering quality is a systematic project. Leadership is the key, system is the means, and technology is the guarantee. After the team enters the site, special quality awareness education will be carried out in different projects and procedures, with strong pertinence, so that everyone can understand the quality requirements and know the quality standards and objectives. Implement leadership control and civilized construction. Establish and improve rules and regulations such as quality rewards and punishments to meet the requirements of construction quality standards in terms of technical equipment and material security such as personnel and machinery.
3. Pay close attention to the process quality to ensure the overall quality.
Establish a quality "three inspections" system based on mass self-inspection, which combines self-inspection, mutual inspection and handover inspection, and a test work system for inspection before, during and after construction. The procedure is to report to the team quality inspection engineer after the team quality inspector passes the self-inspection, report to the quality inspection engineer of the project management department after the team inspection, and then report to the on-site supervision engineer for inspection to ensure the quality of each working procedure.
Adhere to the system of "three obedience, five non-construction, one-vote veto", that is, the progress, workload and measurement are subject to the quality of the project, and the quality problem is rejected by one vote. In the process of construction, due to insufficient construction preparation, the necessary tests are not up to standard, the construction scheme and quality assurance measures are not determined, the design drawings are not approved, and the technical disclosure is not carried out, so the construction is not carried out. Resolutely rework unqualified processes.
4. Carry out standardization work.
1) The project is operated in strict accordance with the standardization, so as to achieve standardized inspection of working procedures, and all inspections have conclusions. The main working procedures of each project are operated in strict accordance with the operation standards, and new technologies, new processes and new methods are applied in various construction and production to ensure the quality of standardized operations.
2) Strict technical standards and earnestly respect supervision.
According to the construction drawings, it conforms to the technical specifications and regulations listed in the bidding documents. When the design is inconsistent with the actual situation, it should be reported to the supervision engineer for review and settlement. Strictly implement the supervision engineer visa system and accept the supervision engineer's inspection and guidance at any time.
3) Strictly control materials
The purchased materials must be complete with three certificates. After entering the site, samples should be taken according to the regulations, and they can be used only after passing the inspection. And large materials must be ordered by manufacturers with good quality and high reputation.
5. Technical measures
Engineering quality assurance measures are an important link to ensure the engineering quality of this bid. It is necessary to establish and improve the quality system, improve the quality awareness of all employees and clarify the quality objectives.
(1) Establish a well-equipped site laboratory.
In order to ensure the engineering quality, firstly, according to the engineering needs, a site laboratory that can meet the test requirements is established, skilled personnel are selected, a strong test team is formed, and fully equipped test instruments are used to do all the test work well under the guidance of relevant experts. Testers must hold relevant certificates, and test instruments must be calibrated and approved by relevant state departments.
(2) According to the technical requirements of design and construction, do a good job in various tests and inspections.
After entering the site, before starting the construction, the different soils in the site should be investigated and sampled in detail, and the test and detection work should be done well on this basis.
(3) adopting new technologies and new equipment.
The adoption of new technology and equipment not only ensures the construction progress, but also ensures the construction quality. Advanced detector is used to monitor and guide the compaction process of subgrade to ensure that the construction process is always under effective monitoring.
④ Measurement work
Establishing a strong survey team equipped with advanced measuring instruments is a control means to ensure the engineering quality from the aspects of position, elevation and geometric size. Our unit will ensure that the survey work meets the requirements of engineering quality from the aspects of team and equipment.
A. Select technicians with high technical level and skilled operation to form a two-level capable survey team of the project management department and the construction team. Project intends to set up a survey team, mainly responsible for control survey, pay-off positioning survey, project review, inspection and other spot checks. Each team's measurement team is sent by the project management department, responsible for helping and supervising, and mastering the measurement work such as checking the construction progress and project quality self-inspection.
B. assemble advanced measuring instruments. The project department is equipped with advanced measuring instruments such as total station and precision level to fully ensure the measuring accuracy.
C. Records shall be carefully made during measurement, and all construction measurement records and calculation results shall be bound into a book according to project classification, with necessary text descriptions. The construction survey data (i.e. survey records and calculation results) of concealed works should be attached to the quality inspection of concealed works, and the construction survey data and completion survey data should be attached to the project completion acceptance.
⑤ Establish a professional team and send a team with rich construction experience and strong ability. Organized by the project department.
Seven, civilized construction
(a) site capacity, appearance layout measures
1, site layout
According to the actual situation of the site, the layout should be reasonable. "Five cards and one map" should be set up in the eye-catching position of the construction site, that is, the name card of the construction unit and the construction site, the safety production publicity card, the fire prevention notice card, the safety no major accident card, the list card of the main management personnel of the construction site, and the general construction plan. The specifications of the card are unified, and the main entry and exit points have publicity signs. On-site facilities and equipment are stacked according to the layout, and the site is arranged and adjusted with the structural progress.
2. Construction roads and construction sites
The construction road shall be smooth and tidy, free of garbage and scattered objects, and the surrounding area shall be kept clean, and the site shall be smooth and free of water; Centralized treatment and stacking of construction waste. During construction work, sprinklers should be equipped to sprinkle water to prevent dust from flying.
3, a large number of materials and equipment
Construction facilities, equipment, templates, etc. Should be neatly stacked, big template should be put in pairs smoothly, the angle is correct, foot hand fasteners should be classified into specifications, steel and steel bars should be piled up in a row;
(2) Health measures for life
1, life hygiene should be incorporated into the overall planning of the site, full-time health management personnel and cleaning personnel should be implemented, and the responsibility system should be implemented.
2. The domestic garbage in the construction camp and the construction site should be piled up in a centralized way. Collect and clean up waste parts, waste materials, cement bags, packing boxes, etc. And do a good job of on-site health work in time.
Eight, environmental protection
Environmental protection is one of the indicators of the comprehensive quality of our unit in the construction of expressway port dredging project in Changxing Island. In strict accordance with the requirements of the Environmental Protection Law, we will actively maintain the local natural environment and residents' clean and comfortable living and working environment, minimize the damage to the natural ecology caused by construction, protect the environment and strive for civilized and standardized construction sites. To this end, the following measures are formulated:
1. Designate a special person to contact the local government and environmental protection department, formulate environmental protection and civilized construction measures in combination with the actual construction situation and the laws and regulations of the state and government on environmental protection, and continuously improve the environmental awareness of all participants.
2. Set enough temporary sanitary facilities in the construction site and living quarters, clean them regularly, and plant flowers and trees around the living quarters to beautify the living environment.
3, equipped with special sprinkler, construction site and transportation road often sprinkler to reduce dust.
4, the use of construction machinery and transport vehicles installed muffler, reduce noise. Avoid arranging noisy machinery for construction at night, which will affect the rest of nearby residents.