Construction of horseshoe steel corrugated pipe culvert

Corrugated Pipe Culverts

The construction method of large diameter horseshoe shaped steel corrugated pipe culvert for channel, the steps of the constructions are Measurement and layout，Excavation of foundation pit.

Foundation construction: After the foundation pit is excavated, the foundation treatment is carried out and the pre arch degree of the culvert bottom foundation is set; check out the base of the foundation loading capacity, the evenness,standard height and width, if all factors are qualified, the foundation construction can be carried out. The loading capacity of foundation can not be lower than 250 Kpa, the Base gravel layer on the foundation base is hard gravels and the dimension of the gravel can not large than 50mm, the thickness of the layer should be 0.5m. the compactness is least 96%. The thickness of gravel layers on the bottom of horseshoe shaped steel corrugated pipe is 0.2m.

1. Steel corrugated pipe assembly: A type plate, B type plate, C type plate, and D type plate components composed of steel corrugated plates are connected in a closed shape in head to tail order, and the connection points of each plate component are connected together by 8.8 grade high-strength bolts.There is a rubber strip between the two panels at the connection place; After the overall connected, then longitudinally connected and installed symmetrically from the center to both ends. The overlap between the outer and inner panels is fixed by bolts, nuts, and washers;

2.Sealing and anti-corrosion treatment: Sealing:After the pre tightening torque of the lap joint outside the corrugated pipe culvert meets the requirements, special sealant is used for the connection between the steel corrugated pipe and the pipe, as well as for all bolt hole gaps. to prevent water seepage occurs at the connection of one corrugated plate. Anti-corrosion treatment of corrugated pipe culvert，The horseshoe shaped corrugated pipe culvert plate and connections should be Hot dip galvanizing. Main while,For the condition of moderate and weak corrosion, On the basis of galvanizing, coating or epoxy resin coating should be used, with a total coating thickness of 0.3-1mm. Under strong corrosive conditions, cement mortar or concrete protective layer should be covered to reduce the corrosion of steel corrugated pipes.

3.Construction of end walls: After the assembly of the corrugated pipe culverts, before construction, to measure the horseshoe shaped corrugated pipe, the diameter and dimension should be not exceed ±2% than design size.The end wall plays a role in retaining soil and guiding water, ensuring the stability of the roadbed or embankment at the culvert. The construction process of the end wall includes scaffolding erection, form work and bracket installation, and installation stability is important, followed by concrete pouring and ensuring good compactness

4.Concrete pouring of culverts inside; After the installation of the corrugated pipe culvert, pouring a carriageway inside the culvert with 40cm thickness. 1% slope is needed to Prevent water accumulation.

5.Construction of octagonal walls; The octagonal wall is built with M10 mortar bricks, and the joints should be staggered with each other. The joints should be full and not dry, stacked, or elevated. Finally, the pointing and plastering should be completed.

6.Back filling around pipes. Back filling is very important, including back filling the pipe body, back filling on both sides of the pipe bottom, and back filling on the top of the pipe.