Installation of Culvert Pipes and Assembled Bridge Culverts

Inspect the specifications, length, and overall appearance quality of the corrugated steel pipe. Those not meeting design requirements or with pipe body damage shall not be used.

Inspect the bottom foundation of the culvert for flatness, compactness, elevation, and the setting of the pre-set arch camber. Determine the culvert position, center axis, and midpoint.

Ensuring the center axis and midpoint coincide, discharge pipe sections sequentially starting from one side. When connecting sections, align the ends and keep flange faces parallel. Rotate and translate the pipe body to align the flange bolt holes. Insert an elastic seal between the end faces. Evenly tighten using the supplied bolts and nuts to ensure connection strength and sealing.

After connecting every 3~5 sections, inspect the culvert position and pipe body alignment. Use jacks or other reasonable methods to correct the entire culvert pipe, ensuring it accurately remains on the center axis of the designated design position.

For circular or circular-arch assembled corrugated steel pipe culverts, inspect the specifications and appearance quality of each corrugated plate. Those not meeting design requirements or with defects shall not be used.

Inspect the bottom foundation of the culvert for flatness, compactness, elevation, and the setting of the pre-set arch camber. Determine the culvert position, center axis, and midpoint. Piece-by-piece assembly of corrugated steel pipes is generally carried out sequentially, piece by piece and section by section, within the trench at the determined installation position. For smaller diameter corrugated metal pipes, segmented assembly can be completed outside the trench before placing the segments into the trench at the determined position for final whole-pipe connection.

For corrugated steel pipes assembled within the trench, assemble the base plate first. Position the first corrugated plate using the center axis and midpoint as the datum, then extend towards both ends until the culvert inlet and outlet. Circumferential splicing should also start from the midpoint datum point, proceeding upwards sequentially from the bottom. Circumferential lap joints of adjacent segments must be staggered; overlapping of four layers or more at the lap joint is strictly prohibited.

After each section is assembled, inspect the cross-sectional shape. Adjust promptly if standards are not met. Perform roundness and position correction of the pipe section every 5 meters of installation. If misalignment or deformation occurs, use jacks, positioning tie rods, or other effective methods for correction and adjustment. Ensure the entire culvert pipe remains on the center axis of the designated design position.

Inspect the specifications and appearance quality of each corrugated plate used for assembly. Those not meeting design requirements or with defects shall not be used.

During assembly, inspect the cross-sectional shape. Adjust promptly if standards are not met. Perform shape and position correction every 5 meters of installation. If misalignment or deformation occurs, use jacks, positioning tie rods, or other effective methods for correction and adjustment. Ensure the entire bridge culvert remains on the center axis of the designated design position.

After the pipe body assembly is complete and the shape/position verified as correct, promptly fill, fix, and protect the connection points between the bottom corrugated plates on both sides of the bridge culvert and the embedded parts in the supporting foundation by secondary concrete pouring. For piece-by-piece assembled corrugated steel pipe bridge culverts, after sequential overlapping and lapping of each piece, pre-tighten 5~6 bolt-nut sets at intervals on each piece. This facilitates subsequent adjustment of the position and angle of other pieces. After all pieces of the entire bridge culvert are spliced and alignment adjusted, then evenly tighten all bolts and nuts. Furthermore, the torque applied to all bolts during splicing should reach 200~400 Nm and must not exceed the bolt's allowable torque.

During the assembly of corrugated steel pipes, inspect the pipe body's cross-sectional shape and the straightness of the entire bridge culvert. Shape deformation should be controlled within 2%; deformation exceeding the standard must be corrected promptly.