The following is the relevant content about the installation of corrugated pipes in aqueduct projects brought to you by Zhongda Consulting for your reference.
The reserved holes of the prestressed steel beams are made of metal corrugated pipes. The diameter of the corrugated pipes is selected according to the design. The corrugated pipes of the beam anchoring steel beams are made of 90*19mm corrugated flat pipes. The bellows connection uses a larger corrugated pipe as the joint pipe. The joint pipe is 400mm long, and each end is inserted into the main bellows 200mm. Both ends of the pipe are sealed with tape to prevent slurry leakage at the joints. The end of the corrugated pipe extends 100mm into the bell mouth of the anchor pad, and the joint is sealed with tape. Corrugated pipe installation: Prestressed corrugated pipes are installed according to the design coordinates. Pipe "well" positioning steel bars are welded according to the steel beam coordinates. The position of the positioning steel bars is strictly controlled and inspected according to the design coordinates to ensure that the pipe position is accurate. In order to ensure the prestressed pipes For accurate positioning, positioning ribs can be added appropriately. The installation of prestressed corrugated pipes and the binding of web steel bars are carried out simultaneously. The installation of the corrugated pipe should be carried out from top to bottom and from outside to inside. It should be fixed as it is installed. When welding and fixing the steel bars, the corrugated pipe should be protected to avoid burns. When the structural steel bars interfere with the corrugated pipe, the structural steel bars should move to give way, but the structural steel bars should not be cut off at will. After the bellows is installed, carefully inspect it and seal it with wide tape if any holes are found.
In order to ensure the grouting effect, when installing the corrugated pipe of the first box girder, an exhaust pipe is placed at the peak of the pipe as a backup. Drill a small hole with a diameter of 2cm in the corrugated pipe, and use a plastic pipe to lead the exhaust hole upward 20cm out of the top plate of the box beam. The connection between the plastic pipe and the corrugated pipe is tied with wire and sealed with tape. If the vacuum grouting method is used and the grouting effect is good, the exhaust pipe may not be placed at the wave crest during subsequent construction.
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