(1) Ready?

1. Construction survey: survey the positions of survey data such as piles, toll stations and benchmark piles in the road.

Re-survey and reinforce the control piles. ?

2. Raw material preparation?

(1), aggregate: hard, clean, without weathering, needle-like particles, with mud content and organic matter content conforming to regulations.

Fan requirements, aggregate gradation meets the design and specification requirements.

(2) Cement: Stability, fineness modulus, initial setting time and final setting time meet the design and specification requirements.

(3) Stone: physical and mechanical indexes such as hardness, cleanliness, compactness, no weathering and ultimate compressive strength.

Comply with the design requirements, geometric dimensions and other appearance indicators meet the specification requirements.

(2) Concrete mix proportion?

1, crush the cement of concrete pavement planned for mechanized construction and small supporting machinery construction.

(Gravel) Stone, sand, additives and other materials? Five days before use in the project? Entrusted the central laboratory according to relevant regulations.

Does the standard method require raw material test and mix design? Mixing design should include mixing.

Flexural tensile and compressive strength of concrete, aggregate grading requirements, water cement ratio, consistency, cement dosage, quality control, etc.

Festival. ?

2. Submit the mix design report and general instructions to the supervision engineer for approval in time. concrete design

After approval? Try mixing now. ?

(3) sampling inspection?

Do sampling inspection according to the requirements of relevant specifications? Do two groups of compressive specimens and two groups of flexural specimens? 7 days and 28 days respectively.

Day compressive strength and flexural strength test. ?

Fourth, concrete pouring?

1, grassroots establishment?

(1) Before paving the cement concrete surface? All pumice, sundries, dust, etc. Should it be removed at the grassroots level? protect

Keep the surface clean? And tidy up the drainage facilities. ?

(2) Whether there are ruts, looseness and other parts that do not meet the specified requirements at the grass-roots level. Should be dug up. same

Class mixed filling? Its compaction thickness shall not be less than 8cm. Reshaping and rolling? And meets the requirement of compactness.

Beg. ?

2, construction machinery preparation?

According to the project scale, construction quality and schedule requirements? Configure the appropriate construction machinery? Its technical performance should meet the requirements.

Construction requirements of concrete pavement. And the name, model, specification,

Quantity, etc? List submitted to the supervision engineer for approval. ?

3. template?

(1) Is the template made of steel plate? And equipped with appropriate devices to ensure that the formwork connection is firm and reliable? pour into

When pouring concrete, it can withstand the impact and vibration of tamping and finishing equipment. ?

(2) the template installation should be straight? No distortion? Adjacent steel formwork shall be tightly connected by flat head locking? Do not leak slurry?

Template joints shall not move in any direction. The height of formwork should be the same as the thickness of concrete pavement? The mistake is

+0, -5 mm.?

(3) Formwork for expansion joints and construction joints? According to the design position of dowel bar and pull rod, drill hole is released. ?

(4) The whole length of the formwork is completely pressed on the base? And correct the slope of the road edge as required.

Degree and vertical placement. ?

(5) the template should be thoroughly cleaned? And apply isolation agent before each concrete pouring. ?

4. Reinforcement setting?

Installation of steel mesh, corner reinforcement and edge reinforcement? Must comply with the provisions of the relevant specifications. ?

5. Concrete mixing and transportation?

(1) The mixing and transportation of concrete meet the specification requirements. ?

(2) After the concrete mixture is discharged from the mixer, what is the longest allowed pouring time? According to the water in the laboratory

How to determine the initial setting time and construction temperature of mud? And report to the supervision engineer for approval. ?

6. Concrete paving?

(1) Before paving concrete mixture? How about the spacing, height, lubrication and stability of the formwork? And steel

The installation positions of steel bars, dowel bars and pull rods shall be comprehensively inspected. ?

(2) The concrete shall be paved with approved paving materials. Is the paving continuous? If it happens for any reason

Halfway down? Construction joints shall be set according to the instructions of the supervision engineer. ?

(3) Ready mixed concrete? Use an internal vibrator to expand along the surface of the formwork for the whole length of the formwork.

Fully vibrate both sides of the sewing device. The vibrator is not allowed to touch the joint device and the side formwork? Do not touch the steel mesh,

Pins and tie rods? In any position? Vibrating time should not be less than the specification requirements? Then use a flat vibrator to vibrate.

Tao. And then use the vibrating leveling beam to vibrate leveling? Should the vibrating beam move in parallel? Go back and forth 2-3 times. ?

7. Surface dressing?

(1) After the concrete paving is completed, tamp and level it? Use approved surface treatment equipment for further leveling? make hay of

The concrete surface reaches the required transverse slope and flatness. ?

(2) When the operation is completed? Don't sprinkle water on the concrete surface. ?

(3) artificial repair joints and uneven concrete surface? On the working bridge approved by the supervision engineer

Continue? The working bridge shall not be supported on concrete that has not yet reached the required strength. ?

(4) The finishing operation should be carried out when the concrete is still plastic and workability? To ensure that the concrete table

Remove moisture and laitance from the surface. On the low surface? No water or dry cement? Must be mixed with fresh mixture.

Concrete filling and finishing. ?

8. seams?

(1) longitudinal seam?

Set longitudinal construction joints according to the drawings. Longitudinal construction joints are flat joints and pull rods? And set according to the requirements of drawings.

Rod? Is the tie rod made of rebar? Set the middle plate thickness? Parallel to the chessboard And perpendicular to the seam wall. In half a painting

After the panel is completed? Paint asphalt on the seam wall? But it shall not pollute the pull rod. ?

(2) Transverse expansion joint?

(1), set expansion joints according to the type required by the drawings? Is the expansion joint perpendicular to the center line of the pavement? The seam wall must be vertical? Adjoin with

The expansion joints of lanes are located on the same cross section? The gap width should be consistent. The lower part of the expansion joint is provided with an expansion joint plate? Upper pouring

Filling joint material. Concrete and other sundries are not allowed to be plugged anywhere in the gap. ?

(2) The movable end of dowel bar of expansion joint? May be located at one end of the seam. Can also be staggered. Movable end sleeve of dowel bar

Is it made of metal or plastic? The maximum clearance between the inner diameter of the sleeve and the dowel bar is 1.5mm? Can be used as a dowel bar

Free activities? Should the sliding end of dowel bar be coated with grease or lubricant? To prevent the dowel from sticking to the concrete.

Together. ?

(3) The gap between the dowel bar and the end of the sleeve is filled with asphalt hemp. ?

(4) The setting method of dowel bar fixing device shall be reported to the supervision engineer for approval? Fixed dowel bars must be parallel.

On the center line of the road? When pouring concrete, it is forbidden to move components. ?

(3) Transverse contraction joint?

(1), the form, size and spacing of contraction joints shall be set as specified in the drawings. ?

(2) Sawing and cutting with a concrete sawing machine? The sawing time depends on the type of cement used and the climatic conditions?

Generally when the concrete strength reaches 1? Is 1.5MPa sawing suitable? Each sawing operation must be completed at one time.

The powder and sundries in the joints are completely removed. ?

(3) When kerbstone and concrete pavement are integrally constructed? Joints should be 5 cm above kerbs.

(4) Transverse construction joints?

(1) at the end of the work every day or when the pouring process is interrupted for more than 30 minutes? Should be set perpendicular to the road centerline.

Flat seam construction joint. ?

(2) The position of construction joints shall coincide with expansion joints or contraction joints as much as possible? Located at the expansion joint, it should be built in the form of expansion joint. ?

(3), according to the design requirements set dowel bar or pull rod? The dowel or tie rod must be parallel to the road centerline and perpendicular to the joint wall. ?

(4), using flat seam and dowel bar form. Half the length of dowel bar is anchored in concrete? The other half is oiled.

Are grease or lubricants allowed to move? When flat seams and tie rods are used? Anchored at both ends. ?

(5), paving adjacent plates? Should the seam wall of the poured concrete panel be coated with asphalt? But it shall not pollute the pull rod or transmit force.

Rod. ?

9. Demolition, maintenance and sealing?

(1) ripping?

(1), when the concrete strength reaches the design strength required by relevant specifications, dismantle the formwork? And get the approval of the supervision engineer.

Agreed. ?

(2), after ripping? Any damage to the honeycomb, pits and board edges should be repaired? Transverse expansion joints will condense in time.

The edge of the clay slab is completely open. ?

(2) health?

Can the cement concrete pavement be heat-insulated and maintained after the cracks are opened? Cover with geotextile after soaking and water conservation? each

The number of sprinklers per day depends on the climate? The general curing period of cement concrete pavement is 14? 2 1 day? Applicable when the temperature is low.

Extension. Vehicles are prohibited from driving during maintenance? It can only be opened to traffic after reaching the design strength. ?

(3) sealing?

(1), all joints and gaps on the concrete panel are sealed with caulking materials according to the requirements and parts of the design drawings. ?

(2) The joint groove shall be dry, free of dust, concrete chips or other sundries. ?

③ The caulking material shall be heated and caulked according to the method recommended by the manufacturer. The joint filler is closely attached to the concrete joint wall.

There is no water seepage. ?

(4) The joint sealant should be filled from the bottom of the groove to the pavement? At least two layers shall be filled for seams with a depth greater than 2.5cm..

Each layer is roughly equal in thickness. ?

(5) In hot season, the joint filling materials should be flush with the road surface? The low temperature season is slightly lower than the road surface. ?

6, caulking with the progress of the project? Before opening to traffic? The caulking material should have enough time to harden. ?

10, quality control?

(1), during the construction process, did the concrete mixture test the compressive strength and flexural strength of concrete according to the specification requirements? And mixing

Allowable deviation of dosage of various components in the mixture. And according to the relevant provisions of the specification? Evaluate the concrete to be qualified.

Degree. ?

② In appearance, the kerb on the pavement is straight and the curve is smooth? Joint filling is full and dense. ?