Construction method for large ultra-deep well

Abstract

The invention discloses a construction method for a large ultra-deep well. In the method, the well is constructed by a drainage method of combining a waterproof curtain and deep well point dewatering; the well is manufactured and sunk; when the well is sunk to a preset depth, the well is constructed by a no drainage method; and when the well is sunk in place, concrete is used for sealing a bottom underwater. The method is characterized by comprising the following construction steps: a, constructing the waterproof curtain by using a rotary jet grouting pile; b, performing deep well point dewatering construction; c, prefabricating the well by sections; d, sinking the well by using the drainage method; e, sinking the well by using the no drainage method; and f, sealing the bottom by using the concrete underwater. The construction method for the large ultra-deep well has the advantages that: the construction steps are designed scientifically and reasonably, the construction period is shortened, piping and quicksand are avoided, the safety of surrounding buildings is ensured, and the construction cost of a project is saved.

Description

technical field [0001] The invention belongs to the technical field of building construction, and relates to a construction method for underground construction (structure), in particular to a construction method for a large ultra-deep caisson. Background technique [0002] The medium and thick plate swirl pool of Jiugang is the largest and deepest circular structure in the current domestic medium and thick plate project, with an outer diameter of 20m and a blade foot depth of -32.1m in the original design, C15 plain concrete bottom cover with a thickness of 2.0m, which was revised -30.1m, C35S6 waterproof concrete back cover, thickness 5m, no beam at the bottom, pool wall thickness mainly 1.5m, 1.2m, 1.0m, 0.8m. Because the construction area is located by the Yangtze River, the groundwater is extremely rich, and groundwater can be seen at about -3m. At the same time, the swirl pool is close to the steel rolling substation that has been put into use, so it cannot be construc...

AI Technical Summary

Problems solved by technology

If the drainage method (dry method) is used, the construction risk is too high, and it is difficult to sink in place

Once piping and quicksand occur, it will pose a serious threat to the safety of construction personnel and machinery, especially for the steel rolling substation in production, which may cause serious consequences of shutdown

[0004] Therefore known big excavation, support mode construction, and drainage method construction large-scale ultra-deep caisson all exist above-mentioned various inconveniences and problems

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