Foundation and Backfill of Bellows Culvert

Structure Plate Corrugated Pipe Culvert is both rigid and flexible, and it must rely on the interaction between soil and structure to exert its bearing capacity. The weight of the backfill and the pressure generated by the live load will be transferred to the filler on the side of the structure and the soil layer below. The supporting soil layer (generally refers to the foundation) below the structure must be sufficient to provide v1. Construction technical requirements

1. Requirements for foundation and backfill materials

The corrugated steel plate culvert is made of steel plate material and has strong adaptability to deformation. The basic material can be replaced with gravel, gravel soil or sandy soil. Try to use granular materials with good structural properties, and must not contain giant pebbles or rocks. Stones with a particle size exceeding 75mm shall not be contained within 300mm around the structure.

2. Compactness requirements

The foundation should be layered and compacted with a vibration compaction machine with a compaction degree of not less than 93%; the wedge-shaped part of the bottom of the pipe can be compacted obliquely by small compaction machinery or artificial wood rods; the backfilling on both sides should be symmetrical construction, layered backfilling The thickness of each layer does not exceed 750px; the compaction degree of both sides and top of the culvert is the same as that of the same elevation subgrade; when the backfill thickness above the culvert exceeds 750px, the static pressure of the roller is used.ertical and horizontal support.

Structure Plate Corrugated Pipe Culvert

3. Scope and thickness of backfill

In the frozen ground area, the range on both sides of the culvert pipe ≥0.5 times the aperture (minimum 0.5 meters), the thickness above the top of the culvert pipe is ≥0.5 meters (0.8 meters when the pipe diameter is greater than 3 meters), fill the gravel within this rectangular range.

In the non-frozen soil area, the gravel is filled with gravel below half of the pipe diameter on both sides, and the filling range on both sides is ≥0.5 times of the pore diameter (minimum 0.5m); the half of the pipe diameter on both sides and the top can be filled with the same material as the roadbed filler.

Second, the construction process preparation before construction → construction lofting → setting up cofferdams → drainage dredging → leveling the site → foundation layering backfill → testing compaction, water content, etc. → leveling → leveling the site → construction lofting → installing culverts → testing Longitudinal slope of culvert bottom→detect culvert pipe sealing and spray anti-corrosion coating→position of culvert pipe→wedge backfilling and tamping→layer backfilling on both sides→detect compaction degree, water content, etc.→layer topfilling of pipe top→detect compaction degree, including Water volume, etc. → Import and export processing.

Corrugated Culvert Pipe Suppliers remind you that during the construction of corrugated steel structures, the owner should appoint a supervisor with relevant knowledge to supervise the construction process and an inspector to ensure that the installation work fully meets the specifications or design requirements.

(1) For small corrugated steel pipe culverts (150-1600 mm), inspections should be carried out at the construction stage of foundation, pipe foundation, arch axillary, arch line and minimum fill thickness. In general, construction records are not required for small structures.

(2) For larger corrugated steel pipes (1800-3000mm) and structural plate corrugated pipes, inspection should be carried out at all stages of assembly and installation.

(3) For large-span structures with a span of more than 3m, on-site inspectors with relevant knowledge should be sent to carry out continuous inspections. They are authorized to accept or reject construction procedures or equipment. The construction inspection of large-span structures should be recorded, and the inspection and control efforts should be the same as the traditional bridge construction.