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1. Before the subgrade of the roadbed unit is constructed, the horizontal middle-drainage drainage pipe shall be buried.
Second, slotting: According to the design of the drawings and the location of the design piles measured by the surveying personnel, manual slotting is carried out. The width of the HDPE pipe is 1~2 cm wider than the pipe diameter, and the groove depth is 23 cm below the surface of the road bed. The length of the groove requires the inner side to be 10 cm from the center line, the outer side extends to the side slope, and the excavation section extends to the inner wall of the side ditch. The slope of the trough should be along the lateral drainage slope, and the slope should not be reversed to ensure that the water in the road is discharged outside the roadbed. Pull the cable before slotting to ensure straightness.
Third, take over: the two ends of each HDPE pipe must be tightened after the rubber ring to avoid water leakage.
4. Lower tube: After cleaning the bottom of the tank and connecting the tube according to the length of the tank, put the tube into the tank, and use the burlap cloth to tighten the mouth at the end of the central divider belt to prevent the debris from entering the tube and causing blockage.
V. Backfilling: Selecting the excavated fine-grained soil backfill, or using sand backfilling, must remove the big stone, and manually tamping after backfilling, the top surface of the backfilling soil should not be higher than the roadbed, lower than the surface of the roadbed 1~ 2 centimeters is appropriate, otherwise it will be crushed by the vehicle and cannot be discharged.
6. Cleaning up: The remaining soil after backfilling should be cleared and cleared immediately, and the road surface should be cleaned. The remaining soil of HDPE pipe should be centralized and unloaded at designated places such as the borrowing site, and should not be unloaded on the road.
VII. After the construction of the base layer of the filling section, on the brushed slope, in the water outlet according to the design size, the cast-out trapezoidal water outlet pad, the pad is cast by a shaped wooden mold, and the slope is flattened before pouring. And nailed three bamboo sticks of 25 cm long for stability.
8. It is necessary to ensure that there is a drain pipe at the lowest point of the vertical curve of the route to ensure that there is no water accumulation on the road surface. The super high pressure pipe is required to be placed in the super high section of the fill, and after the road bed is inspected, the position of the design according to the drawings is measured and staked in time. The pipe and well position are determined, and the small excavation machinery is slotted manually. The slope of the groove meets the design requirements to ensure smooth drainage, the groove width is not less than, the groove width is not less than 47cm, and the excavated waste residue is cleared and released in time. In the filling section, in order to ensure the thickness of the top of the pipe, ensure that the HDPE pipe is not crushed, and the bottom of the groove is reduced by 20 cm. In the ultra-high roadbed of the stone excavation section, the construction is carried out after the completion of the base layer.
Transparent Case Steel Tape Measure
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