The rigid foundation at the bottom of the geocell is cast with C20 SLATE concrete. The anchor can be made of 18mmR235 steel bars, the length of the anchor connecting the cell and the rigid foundation is 1.0m, and the length of the anchor connecting the cell is 0.5m. The horizontal spacing of the anchor is 1.0m~2m, and the longitudinal spacing is 2.0m.
The geocell is made of high-density polyethylene and polypropylene, the welding distance is 80cm, the height of the geocell is 20cm, the wall thickness of the geocell is 1.2mm, and the tensile strength at the weld is 10.6kN/m. The low temperature embrittlement temperature is -60℃ and the softening temperature of Vica is 125℃.
Construction process:
(1) The purchased geocell materials must have a factory certificate and test report, and random samples should be taken every 5000m3 for strength index tests, and the results must meet the design requirements.
Lofting hanging line: To restore the piles in the route, determine the embankment filling boundary according to the design diagram and the actual ground elevation (to ensure the shoulder compaction degree, each side is widened by 30-50cm), determine the filling layer thickness according to the corresponding loose paving factor, and drive side piles (20m spacing, gradient section encrypted), mark the layer thickness on the side piles and connect them with nylon rope to control the filling width and layer thickness.
Fill transportation: according to the actual amount of transport vehicles, according to the thickness of the loose spread to calculate the distance of the pile by the special command.
(2) When laying the geoglage room, it is necessary to completely open the geoglage room, and fix the surrounding area, and the filling can be accepted before the acceptance room, and the mechanical equipment is strictly prohibited to travel on it before the material is laid. Spreading: When spreading, the thickness and width should be controlled by hanging line, and the filling should be roughly spread out by the bulldozer first, and then the leveling. Section 95 was leveled with a grader. The whole time to form 2% to 4% of the road arch.
Sprinkling or cooling: Check the moisture content of the filler, and use the method of sprinkling or cooling to control its water content within the best water content of ±2% (alcohol drying method on site to quickly determine the moisture content).
(3) The retaining wall cell packing requires uniform particle size, and the maximum particle size shall not be greater than 5cm. The filling thickness of each layer is not more than 30cm, but not less than 25cm. The packing can be rolled after leveling, and the compaction degree of the packing is controlled by 93%.
Rolling: Check the thickness, flatness and water content of the loose paving before rolling, and roll quickly after meeting the requirements. When rolling, it should follow the principles of first light and then heavy, first stable and then vibration, first low and then high, first slow and then fast, and wheel track overlap, from both sides to the middle, the transverse joint generally overlaps 1/3 wheel track, and the adjacent sections before and after should be longitudewise overlapped 1.0-1.5m. Achieve no leakage pressure, no underpressure, no dead Angle.
(4) Anti-rust measures should be taken to fix the anchor nails in the geocell.
(5) Temporary drainage measures should be taken during construction
Detection:
The compaction degree was measured by sand filling method. Level, steel rule to detect width, elevation, slope; 3 meters straight ruler to detect flatness.