Spliced chamber cofferdam for repair of canal lining projects

Abstract

The invention discloses a spliced chamber cofferdam for repair of canal lining projects. The cofferdam is in an I shape can comprises top end cofferdams and a middle cofferdam, wherein the top end cofferdams are matched with the cross section of a canal in shapes and located at the two ends of the upstream and the downstream, and the middle cofferdam is arranged between the two top end cofferdams and located in the center of the canal. The cofferdams are formed by splicing a plurality of chamber bodies in the direction of water flow, every two chamber bodies connected in the direction of the water flow are communicated with each other, hydraulic doors used for opening or closing a water flow channel is arranged on the chamber bodies located at the top ends, the adjacent chamber bodies are connected with each other through lock catches and are provided with waterstops, bottom plates of the chamber bodies which are located at the center of the canal and are in contact with the bottom of the cannel can be disassembled, and a pedestrian path leading to the bottom of the canal is arranged at the tops of the chamber bodies of the middle cofferdam. The spliced chamber cofferdam for canal lining repair does not need a pile foundation, is stable without a root, and cannot damage canal lining concrete and water-stopping materials under the canal lining concrete. The spliced chamber cofferdam is convenient to assemble, disassemble, store, transport and construct, good in safety, capable of being repeatedly utilized, and particularly suitable for repair and replacement of the canal lining concrete of large water conveyance projects and the water-stopping materials under the canal lining concrete.

Description

technical field [0001] The invention relates to a water-retaining cofferdam suitable for the repair of channel lining engineering, especially for large-scale water conveyance projects where pile foundations are not allowed to be laid to avoid damage to the channel lining concrete and the water-stop material below it. Assembled gate box cofferdam repaired by lining engineering. Background technique [0002] Due to the uneven distribution of water resources, in order to alleviate the water shortage in water-scarce areas, large-scale water transfer projects have emerged as the times require. The water delivery channels of water diversion projects generally adopt open channels, PCCP pipes, and hidden culverts, and open channels are widely used because of their low cost. The structural type of the open water channel is mostly concrete lining with trapezoidal section, the lining thickness is 8cm-10cm, and there are insulation materials, composite geomembrane, drainage system, etc...

AI Technical Summary

Problems solved by technology

General earth-rock cofferdams, grass-soil cofferdams, and concrete cofferdams occupy a large area and are not suitable for channel engineering; wooden sheet pile cofferdams and steel sheet pile cofferdams need to go deep into the soil layer, which will damage the lining concrete and the lower water-stop structure. It is also not feasible; ordinary caisson cofferdam has poor stability, which is not conducive to safe construction

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