Open caisson sealing bottom water drainage device and construction method

Abstract

The invention discloses an open caisson sealing bottom water drainage device and a construction method. The device comprises a well tube. A head sealing cover is connected with the top of the well tube. Water permeable holes are evenly formed in a tube wall on the lower portion of the well tube. Filter screens are arranged on the outer side of the tube wall of the lower portion of the well tube and at the bottom of the well tube, wherein the outer side of the tube wall is provided with water permeable holes. The head sealing cover is connected with the well tube through threads. The filter screen is a three-layer dense screen sheet and fixed on the lower portion of the well tube through an iron wire. The open caisson sealing bottom water drainage device has the advantages of being simple in manufacture, convenient to install, good in open caisson sealing bottom water draining and water sealing effect, low in investment cost and capable of improving project efficiency.

Description

technical field [0001] The invention relates to a caisson construction device in a construction project, in particular to a caisson bottom sealing drainage device. Background technique [0002] The existing drainage method for caisson bottom sealing generally uses a sump pit reserved in the gravel layer at the bottom of the deep well, and then the water in the sump is drained, and then the bottom sealing concrete is poured directly. This construction method is used before the initial setting of the bottom sealing concrete. When the groundwater level rises at the bottom of the well, taking away part of the concrete cement slurry often causes water leakage at the bottom of the sealing layer. Generally, after sealing the bottom, use plugging king or chemical grouting to repair the leakage. large, and there are security risks. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a caisson bottom sealing drainage device which is simple in manufa...

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Problems solved by technology

[0002] In the existing drainage method for caisson bottom sealing, generally, a sump is reserved in the crushed stone layer at the bottom of the deep well, and then the water in the sump is drained, and then the bottom concrete is poured directly. Part of the concrete cement slurry is taken away during the rise of the groundwater level at the bottom of the well, which often causes water leakage in the bottom sealing layer. Generally, after sealing the bottom, use plugging king or chemical grouting to repair the leakage. The plugging treatment is expensive, labor-intensive, and time-consuming. Big, and there are security risks

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