(1) Prepare \ x0d \ x0d \ 1. Re-survey of construction: Re-survey the positions of measurement data such as road center piles and benchmark piles at intersections and toll stations, and reinforce the control piles. \x0d\\x0d\2。 Raw material preparation \ \ x0d \ (1), aggregate: hard, clean, without weathering, needle-like particles, silt content, organic matter content meet the specification requirements, and aggregate gradation meets the design and specification requirements. \ x0d \ \ (3), stone: the texture is hard, clean, dense and free from weathering, and the physical and mechanical indexes such as ultimate compressive strength meet the design requirements, and the appearance indexes such as geometric dimensions meet the specification requirements. \ x0d \ x0d \ (2) Concrete mix ratio \ x0d \ x0d \ 1, which is intended to be used in mechanized construction and small supporting machinery construction. Five days before the project is used, the central laboratory is entrusted to carry out raw material test and mix proportion design according to the standard method requirements of relevant regulations. Mix design should include details such as concrete flexural and compressive strength, aggregate grading requirements, water cement ratio, consistency, cement dosage, quality control, etc. \x0d\\x0d\2。 Submit the mix design report and general instructions to the supervision engineer for approval in time. After the concrete mix design is approved, the trial mixing shall be conducted immediately. \x0d\\x0d\ (III) Sampling inspection \x0d\\x0d\ Conduct sampling inspection according to the requirements of relevant specifications, make two groups of compressive and flexural specimens, and conduct compressive and flexural strength tests for 7 days and 28 days respectively. \x0d\\x0d\ IV。 Concrete pouring \ x0d \ x0d \ 1. Preparation of base course: \ x0d \ x0d \ (1) Before the cement concrete surface course is laid, all pumice, sundries and dust on the base course should be removed to keep the surface clean. \ x0d \ x0d \ (2) Whether there are ruts, looseness and other parts that do not meet the specified requirements at the grass-roots level. Should be dug, removed and filled with similar mixture, compaction thickness shall not be less than 8cm, shaping, rolling, and achieve the required compactness. \ x0d \ x0d \ 2。 Preparation of construction machinery: \ x0d \ x0d \ According to the project scale, construction quality and progress requirements, appropriate construction machinery shall be configured, and its technical performance shall meet the requirements of concrete pavement construction. Name, model, specification, quantity, etc. All kinds of construction machinery on site shall be listed and submitted to the supervision engineer for approval. \x0d\\x0d\3。 Formwork: \ x0d \ x0d \ (1) Formwork is made of steel plate material and equipped with appropriate devices to ensure that the formwork connection is firm and reliable, so that it can withstand the impact and vibration of tamping and finishing equipment when pouring concrete. \x0d\\x0d\(2) The formwork installation shall be straight without distortion; Adjacent steel formwork shall be tightly connected by flat head locking, and slurry shall not leak; Template joints shall not move in any direction. The height of formwork shall be the same as the thickness of concrete pavement, with an error of +0 and -5mm \ x0d \ \ x0d \(3) Formwork for expansion joints and construction joints shall be laid out and drilled according to the design positions of dowel bars and tie rods. \x0d\\x0d\(4) The formwork is completely pressed on the base course in the whole length, and it is correctly placed according to the slope and longitudinal direction required by the edge of the completed pavement. \x0d\\x0d\(5) Before pouring concrete, the formwork shall be thoroughly cleaned and coated with isolation agent. \x0d\\x0d\4。 Reinforcement setting: \ x0d \ x0d \ The installation of steel mesh, corner reinforcement and edge reinforcement shall comply with relevant specifications. \x0d\\x0d\5。 Concrete mixing and transportation: \ x0d \ x0d \ (1) Concrete mixing and transportation meet the specification requirements. \x0d\\x0d\(2) The longest allowable time from the discharge of concrete mixture to the completion of pouring is determined by the laboratory according to the initial setting time of cement and the construction temperature, and reported to the supervision engineer for approval. \x0d\\x0d\6。 Concrete paving: \ x0d \ x0d \ (1) Before paving the concrete mixture, the spacing, height, lubrication and stability of the formwork and the installation positions of steel bars, dowel bars and tie rods shall be comprehensively inspected. \x0d\\x0d\(2) The concrete shall be paved with an approved paver, and the paving shall be continuous. If the work stops halfway for some reason, construction joints shall be set according to the instructions of the supervision engineer. \x0d\\x0d\(3) After concrete is mixed, it shall be fully vibrated along the surface of the formwork within the whole length of the formwork and on both sides of all expansion joints. The vibrator shall not touch the joint device and the side formwork, and shall not touch the steel mesh, dowel bar and pull rod. In any position, the vibrating time shall not be less than the specification requirements, and then vibrating with a flat vibrator. Then use vibration leveling beam for vibration leveling, and the vibrating beam should move in parallel and level it back and forth for 2-3 times. \x0d\\x0d\7。 Surface finishing: \ x0d \ x0d \ (1) After the concrete paving, tamping and leveling operations are completed, it will be further leveled with approved finishing equipment, so that the concrete surface can reach the required transverse slope and flatness. \x0d\\x0d\(2) No water shall be sprayed on the concrete surface during finishing operation. \x0d\\x0d\(3) Manual repair of joints and uneven concrete surface shall be carried out on the working bridge approved by the supervision engineer, and the working bridge shall not be supported on the concrete that has not yet reached the required strength. \x0d\\x0d\(4) Dressing operation shall be carried out while the concrete is still plastic and workability, so as to ensure that the water and laitance on the concrete surface are removed. Water spraying and dry cement are prohibited in low-lying areas on the surface, and must be filled and trimmed with fresh concrete. \x0d\\x0d\8。 Joints: \ x0d \ (1) Longitudinal joints: \x0d\\x0d\ Set longitudinal construction joints according to drawings. The longitudinal construction joint adopts flat seam tie rod type, and the tie rod is set according to the drawing requirements. The tie rod is made of steel bars and set in the middle of the thickness of the plate, parallel to the plate surface and perpendicular to the seam wall. After half a panel is completed, asphalt shall be painted on the seam wall, but the tie rod shall not be polluted. \x0d\\x0d\(2) Transverse expansion joints: \ x0d \ x0d \ (1) Expansion joints shall be set according to the types required by the drawings, and the expansion joints shall be vertical to the center line of the road surface and the joint walls shall be vertical. The expansion joints of adjacent lanes should be set on the same cross section, and the joint width should be consistent. The lower part of expansion joint is provided with expansion joint plate, and the upper part is filled with joint filler. Concrete and other sundries are not allowed to be plugged anywhere in the gap. \ x0d \ x0d \ ②。 The movable end of expansion joint dowel bar can be set at one end of expansion joint or staggered. The sleeve at the movable end of the dowel bar is made of metal or plastic, and the maximum clearance between the inner diameter of the sleeve and the dowel bar is 1.5mm, which enables the dowel bar to move freely. The sliding end of dowel bar should be coated with grease or lubricant to prevent dowel bar from sticking to concrete. \x0d\\x0d\③。 The gap between the dowel bar and the end of the sleeve is filled with asphalt wadding. \ x0d \ \ x0d \ (4)。 The fixing method of dowel bar shall be reported to the supervision engineer for approval. The fixed dowel bar must be parallel to the center line of the road, and it is forbidden to shift the components during concrete pouring. \x0d\\x0d\(3) Transverse contraction joint: \ x0d \ x0d \ (1) The form, size and spacing of contraction joint shall be set according to the requirements specified in the drawings. \ x0d \ \ x0d \ (2), kerf is cut by concrete sawing machine, and kerf time depends on the type of cement used and climatic conditions. Generally, when the concrete strength reaches 1 ~ 1.5 MPa, it is advisable to kerf, and each kerf operation must be completed at one time. The powder and sundries in the joints are completely removed. \ x0d \ x0d \ ③ When kerbstone and concrete pavement are constructed as a whole, the joint shall extend to 5cm above kerbstone. \x0d\\x0d\(4) Transverse construction joints: \ x0d \ x0d \ (1) When the work is finished every day or the pouring process is interrupted for more than 30 minutes, butt joints perpendicular to the road centerline shall be set. \ x0d \ x0d \ (2), the position of construction joints shall overlap with expansion joints or contraction joints as much as possible, and the construction shall be carried out at expansion joints in the form of expansion joints. \ x0d \ x0d \ (3). According to the design requirements, the dowel bar or tie rod must be parallel to the center line of the pavement and perpendicular to the joint wall. \ x0d \ \ x0d \ (4), in the form of flat seam and dowel bar. Half the length of dowel bar is anchored in concrete, and the other half is coated with grease or lubricant, allowing it to move; In the form of flat seams and tie rods, both ends are anchored. \ x0d \ x0d \ ⑤。 When laying adjacent slabs, the seam wall of the poured concrete slab shall be coated with asphalt, but the tie rod or dowel bar shall not be polluted. \x0d\\x0d\9。 Form removal, maintenance and joint sealing: \ x0d \ (1) Form removal: \x0d\\x0d\①. When the concrete strength reaches the design strength requirements of relevant codes, the formwork can be removed and the consent of the supervision engineer can be obtained. \ x0d \ x0d \ ② After formwork removal, the honeycomb, pitted surface, board edge and other damages should be repaired, and the transverse expansion joint should be opened to the full depth along the edge of the concrete panel in time. \x0d\\x0d\(2) Maintenance: \ x0d \ x0d \ Cement concrete pavement can be heat-insulated and maintained after slit. After being soaked with geotextile, cover it with water for maintenance. The number of sprinklers per day depends on the climate. The general curing period of cement concrete pavement is 14 ~ 2 1 day, and it will be appropriately extended when the temperature is low. Vehicles are prohibited from driving during the maintenance period, and traffic can be opened only after reaching the design strength. \x0d\\x0d\(3) Sealing: \ x0d \ x0d \ (1) All joints and slots in the concrete panel are sealed with caulking according to the requirements and positions of the design drawings. \ x0d \ x0d \ ②。 Joints and grooves shall be dry and free of dust, concrete fragments or other sundries. \ x0d \ x0d \ 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, which is impermeable to water. \ x0d \ \ x0d \ (4), caulking materials should be filled from the bottom of the groove to the road surface, and the gap with a depth greater than 2.5cm should be caulked in at least two layers, each layer being roughly equal in thickness. \x0d\\x0d\⑤。 The joint filling operation makes the joint filling material flush with the road surface in high temperature season and slightly lower than the road surface in low temperature season. \ x0d \ x0d \ ⑥。 With the progress of the project, the sealing materials should have enough time to harden before opening to traffic. \ x0d \ x0d \ 10。 Quality control: \ x0d \ x0d \ ① During the construction process, the compressive strength and flexural strength of concrete and the allowable deviation of the dosage of various components in the mixture should be tested according to the specification requirements. And according to the relevant provisions of the specification, evaluate the qualified strength of concrete. \ x0d \ x0d \ ②。 Appearance, pavement kerbs are straight and smooth, and joints are full and dense.