Construction method for blocking depressurization well by adopting accelerated cement

Abstract

The invention discloses a construction method for blocking a depressurization well by adopting accelerated cement. The construction method includes the step 1, filling a filter pipe on the bottom of a well casing with the accelerated cement after precipitation and before well blocking, step 2, blocking gaps around the filter pipe after the cement hardens when meeting underground water in the casing and after the cement seeps into the filter pipe, step 3, pumping residual water in the well casing out after the cement reaches initial setting time, step 4, welding two layers of water stop steel plates outside the well casing, step 5, carrying out primary microdilatancy concrete pouring and smashing in the casing when the water level on the bottom of the casing does not rise obviously after the cement sets and hardens in the bottom of the casing, step 6, guaranteeing that water seepage does not exist below a casing mouth, welding short steel bars in the plane, placing a flange ring, and carrying out full weld on the portion, above the ring face and the portion, around a casing wall, step 7, welding and sealing the steel plates fully on the upper portion of the flange after full-weld is carried out on the flange, and then carrying out secondary microdilatancy concrete pouring in a high casing until the casing mouth face is flat, and step 8, pouring the high casing and a bottom plate to a bottom plate structural face after well blocking is completed. According to the construction method, operation is quick and convenient, well blocking periods are short, cost is low, and the construction method can be applied to later-stage different water yield situations of the depressurization well in a pit.

Description

Technical field [0001] The invention relates to the field of construction, and in particular to a construction method for plugging a pressure-reducing well by using quick-setting cement to improve the water-stop effect after the pressure-reducing well is blocked. Background technique [0002] With the rapid development of modern construction industry, large-scale buildings are equipped with deeper and larger basements. The use of underground space in deep foundation pits has become a trend in modern buildings. With the continuous excavation of foundation pits, the phenomenon of groundwater surges There are certain hidden safety hazards to the construction of deep foundation pits, and at the same time, the dewatering effect of deep foundation pits is required to be higher and higher. In the construction, in order to speed up the progress of the project, the dewatering construction generally needs to reach the designed dewatering depth within a few weeks before the excavation of th...

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Problems solved by technology

[0005] (2) For the normal water output of the decompression well in the later stage of the pit greater than 6m 3 In the case of / h, special well sealing measures are considered, generally in the form of filling melon seeds in the well pipe and then grouting, but the sealing process is more complicated, there are more plugging procedures and the plugging period is longer, for the whole The construction progress of the foundation pit floor has a certain influence

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