1, project overview
1. 1 Overview
This project is a playground project of primary school in Bafang Community, with a planned investment of 570,000 yuan. The project includes a 250-meter-long plastic track around the city, an artificial grass football field around the city, two small basketball courts, and sports venues such as bunkers and table tennis areas.
1.2 technical standard
The circular runway is 6.3m wide, all made of plastic, and the small football field is 47.5m wide: the flag-raising platform is located in the loop of the north, with a length of 4m and a width of 3m, and adopts a brick flag base; The bunker is located on the outside of the runway, with a run-up distance of 18m, a bunker length of 8m, and a bunker width of 6m, and its periphery is higher than the original ground 1cm. The walls of the bunker are made of bricks and polished with powdered cement mortar. The football field is planted with artificial turf, and the basketball court is trimmed with cement concrete.
1.3 construction period
The bidding documents of this project require a construction period of 2 months, and our company will advance the original construction period according to similar construction experience to ensure that all the quantities are completed within 54 days.
2. Construction deployment
2. 1 construction organization
According to the actual situation of this project, combined with our company's management experience, this project will set up a project management organization at the first level, which will be solely responsible for the construction management of this project on behalf of the head office. The project management department consists of five groups: engineering technology group, quality inspection and safety group, mechanical ministry of materials and equipment, comprehensive office and central laboratory. It is divided into earthwork construction group, concrete construction group, plastic construction group and measurement group.
2.2 The main functions of each department
Project management department: responsible for organizing the production, operation and investment control of the project, coordinating the relationship between various departments and organizing the operation of the quality management system.
Technology Department: Implement the relevant national technical policies and the owner's technical management system, and be fully responsible for the technical work of the project construction; Be responsible for formulating the construction plan, compiling the construction organization design, participating in the construction budget and final accounts, and auditing the construction settlement; Be responsible for making decisions and reporting on major technical issues such as tests and measurements during construction.
Engineering Department: responsible for engineering technology business, preparing project progress plan, collecting and sorting out monthly survey reports, collecting and sorting out completion data, actively cooperating with the work area to implement control survey, handling general technical problems by itself, and providing reliable information for the project manager.
Quality inspection department: responsible for the quality management and the formulation of the project excellence plan, and organize their implementation, responsible for the investigation and handling of engineering quality accidents, and timely report to the superior. Cooperate with the supervision engineer to control the project quality, and be responsible for the daily construction quality supervision of the project. The quality inspection department has a central laboratory, which is responsible for the standard experiment before construction, the detection experiment during construction, the identification experiment after construction and data collation, and at the same time, it guides and supervises the experimental work in the work area and provides timely treatment suggestions for the project manager.
Mechanical materials department: responsible for organizing mechanical materials to enter the site, maintaining mechanical management equipment, giving practical guidance to the work area, providing ten-day and monthly material plans, and making the whole construction link run effectively.
General department: responsible for raising funds for the whole project, reviewing the capital flow in the whole process, proposing the capital flow plan, conducting cost accounting, and providing decision-making basis for the project manager; Responsible for uploading and issuing, political propaganda, local coordination, document management, administrative management, meeting arrangement and production safety, regularly check and implement the safety situation, and promote civilized construction.
3, the main component project construction scheme, construction method
3. 1 Preparation before construction
Contractor's permanent building
After entering the site, pay close attention to the construction of project headquarters and processing workshop. The temporary houses of this project and the construction team are planned to be rented outside.
3.2 Construction survey
Plane control adopts total station coordinate method to set out, and elevation is measured by level.
Verify the center line of the runway, comprehensively retest and encrypt the traverse points and leveling points provided by the design department, and recheck the center line and sideline.
According to the road center coordinates provided by the design drawings, the coordinates of each pile number are calculated, the calculation program is compiled, and each element point of the horizontal curve is calculated.
Add leveling points and permanent leveling points in relatively stable areas, so that the construction survey will be transferred to the site as little as possible.
3.3 Construction of Sand Cushion for Runway Basement
20cm thick 5% cement stabilized macadam base
It is planned to use unscreened gravel, river sand and 5% cement to form cement stabilized gravel. Gravel and river sand must meet the specification requirements, and can only be used after testing and trial matching meet the requirements, achieving good gradation. Sand and gravel materials shall not contain harmful and weathered impurities, and the mud content shall not exceed the specification requirements. According to the width and thickness of each subbase and the specified compaction dry density, and according to the determined mixture ratio, the number of gravel and debris required for each segment is calculated respectively, and the stacking distance of each vehicle is calculated. When paving with grader, the loose paving coefficient should be determined in advance through experiments, which is about 1. 15 ~ 1.25. When paving, it should be as flat as possible, and the place where the grader can't level can be supplemented by manual leveling. The edge should be paved 20 ~ 30cm wide to ensure that the roller at the edge can enrich the rolling.
The principle of rolling is "slow first and then fast", and the principle of rolling type is "light first and then heavy". In the process of light pressure and voltage stabilization, it should be checked at any time. If uneven phenomenon is found, it shall be leveled at any time. After rolling for 2-4 times, it should be re-rolled, the rolling speed should be increased to 30-35 m/min, and the water consumption should not exceed 0.5Kg/m2 each time, and it should be rolled to the required compactness. Roller tracks should overlap 25 ~ 30cm, and the edges should be pressed for 2 ~ 3 times. After the degree of compaction is qualified, remove the pulp width and cover the straw bag for wine curing for not less than 7 days.
3.4 Cement concrete panel
template
Before the formwork installation, the floating soil and sundries on the surface of the base approved by the supervision engineer shall be removed and the necessary finishing shall be carried out. Template adopts steel template, its strength, stiffness and stability should meet the requirements of installation, joints should be tight, ensure no slurry leakage, after installation should be coated with isolation agent. Before pouring, the on-site technical director, the builder and the quality inspector should carefully check whether it is firm and whether the geometric dimensions meet the design requirements. Concrete can be poured only after it is accepted. When the formwork is dismantled, it can only be dismantled after being notified by the on-site technical director according to the provisions of the construction specification.
concrete work
The materials for paving concrete shall be tested at least 28 days before the design coordination, and the test sheet shall be submitted to the supervision engineer for approval. This project adopts centralized concrete mixing station, and the mixture ratio should be strictly controlled as required. The concrete mixture is transported to the pouring site by dump truck to prevent slurry leakage and segregation. In winter construction, cover or heat preservation measures should be taken when necessary, and the discharging height during discharging and paving should not exceed1.5m. When there is obvious segregation, it should be mixed again during paving. Using artificial paving, shovel down. It is forbidden to throw and rake to prevent concrete mixture from segregation. Vibrating adopts flat vibrator and vibration eliminator, which can fully meet the construction requirements of concrete in this project. The vibrating time of each part shall be subject to the mixture stopping sinking, no more bubbling and radiation mortar, and it is not advisable to vibrate too much. When vibrating, it is supplemented by manual leveling, and check the template for deformation and looseness at any time. Roller-type paving and leveling machine for cement concrete pavement is used for leveling. When the sun is exposed or the dry wind blows, a shade shed should be built for construction. After the surface is leveled, according to the surface structure depth required by the drawing, the texture is made on the concrete surface along the cross slope direction to meet the anti-sliding requirements of the concrete pavement. After the concrete panel is finished, it is necessary to spread straw bags and spray water for maintenance in time.
Reinforcement setting
Steel mesh should be prefabricated in advance, and a layer of concrete mixture should be laid at the bottom when placed. Paving height should be based on the design position of steel mesh with a certain amount of settlement in advance. After the steel mesh is in place, continue pouring concrete, and be careful not to trample the steel mesh. When placing corner reinforcement, a layer of concrete mixture should be laid at the corner where the reinforcement is placed. The paving height should be pre-loaded with a certain degree of settlement than the design position of reinforcement. After the corner reinforcement is in place, flatten it with concrete mixture. When placing the edge reinforcement, first lay a layer of concrete mixture along the edge and compact it to the height set by the reinforcement, then place the edge reinforcement and flatten it with concrete mixture at the bend.
expansion joint
The expansion joint should be set perpendicular to the center line of the pavement, and the joint wall should be vertical. Foam board should be placed according to the design requirements, and the joint width should be consistent. Mud is not allowed in the joints. After the pavement reaches the design strength, dig a foam board of more than 4cm, and then caulk. The steel dowel shall be φ 25 round steel, and the fixed end shall be welded with the steel bar in the concrete slab. The movable ends should be staggered on both sides of the joint according to the design, and coated with asphalt and plastic sleeves. The fixed dowel bar must be parallel to the center line of the road surface and the board surface.
Filling and embedding
All joint grooves of concrete slabs shall be filled with caulking material as specified in the drawings, and the caulking materials and methods shall be approved by the supervision engineer. After the expiration of concrete curing period, joint filling should be done in time, and the joint must be kept dry and clean before joint filling to prevent sand and gravel from falling into the joint. The joint sealant should be tightly attached to the concrete joint wall, and it can not be opened to traffic until the joint sealant is fully hardened.
3.5 Plastic surface structure
The runway surface of this project is made of plastic, and plastic products are made by professional manufacturers, and professional construction teams are hired for construction.
Matters needing attention in construction:
Drain plate and drain hole should be straight, smooth and firmly installed, and the surface of drain plate should be consistent with the elevation of asphalt concrete surface without obvious height.
The reinforced concrete structure number is above 250, and its appearance is bright and clean, and it glows with the beating.
The external dimensions of cement concrete structures with internal drainage shall be controlled within the design radius of -0. 10-0. 12m. ..
At the junction of plastic runway and inner and outer cement concrete edge, the concrete edge should be controlled to be 8- 10 mm higher. Ditch cover plate's lateral connection surface is vertical. This design brings great inconvenience to the construction and directly affects the quality of the inner ring groove. The difference between the bottom surface and the top surface of the cover plate is 1cm, and the bottom surface is wide and the top surface is narrow, so that the connecting side surface forms an inclined plane with a large bottom and a small top. This design and construction is convenient. When two ditch cover plate pieces are connected, the bottom is tight, and there is a seam of 1cm on it, forming a V-shape. With this connection, cement mortar can be easily poured into the joint and smoothed when jointing, so that the ring groove is formed as a whole and the high quality of the project is guaranteed.
3.6 Construction of fuel tank
First, the central line pile of coal bunker is set out by total station, and then the excavation width of cable trench is set out according to the excavation depth, width, working face and slope ratio. The excavation depth is controlled by level, and the excavation is measured manually.
After the foundation pit excavation is completed, the next step of construction can only be carried out after the supervision and owner's acceptance and hidden verification.
3.7? M5 cement mortar 240 thick Mu 10 brick flagpole.
First of all, red bricks must be sent for inspection, and M5 cement mortar should be designed and tested.
(1) Before assembling the red brick, water it to ensure that the water content is about 10%.
(2) When assembling, it should be horizontal and vertical, with full mortar and staggered joints. The assembly method is "three-in-one" and the operation method is "three-in-one masonry method", that is, one brick, one shovel and one squeeze.
According to the design requirements, embedded cable trench bracket. After the plastering of the inner ditch is completed, the back of the abutment outside the ditch can be manually rammed and filled, and the remaining soil can be transported abroad.
In the face of complicated operating procedures, many people will undoubtedly feel headache, but how can we ensure the smooth progress of the project without rigorous planning scheme and adequate preparation and response scheme? If you don't know how to write the plan of the plastic track, it is better to refer to the example provided by Bian Xiao for your reference, and then make your own construction plan of the plastic playground according to the general situation of the project you received. I believe your project and work will be successfully completed.
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