A dewatering treatment method for foundation pits in steeply inclined strip-like interbedded composite strata

A treatment method, strip-shaped technology, applied in infrastructure engineering, construction, etc., can solve problems such as engineering and surrounding environment safety accidents, upper diving and surrounding environment changes, increase cost, etc., achieve good pressure reduction effect and reduce quantity , The effect of saving investment and construction period

Active Publication Date: 2021-11-02
徐州地铁集团有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Composite strata often refer to the stratum with the upper part being the soil layer and the lower part being the rock layer. According to similar engineering surveys at home and abroad, the dewatering of foundation pits in such strata is often conservative in design, increasing the cost and prolonging the construction period; in addition, if there is an upper submerged and the lower part of the confined water, the reduction of the confined water may lead to changes in the upper diving and the surrounding environment, and even cause engineering and surrounding environment safety accidents

Method used

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  • A dewatering treatment method for foundation pits in steeply inclined strip-like interbedded composite strata
  • A dewatering treatment method for foundation pits in steeply inclined strip-like interbedded composite strata
  • A dewatering treatment method for foundation pits in steeply inclined strip-like interbedded composite strata

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Embodiment 1

[0034] Such as Figure 1-4 As shown, a method for dewatering treatment of foundation pits in steeply inclined strip-shaped interlayer composite strata, the specific construction method is as follows:

[0035] Step 1, the underground diaphragm wall 8 of the foundation pit is completed; the foundation pit is composed of the shallow pit 1 of the open excavation hall, the deep pit 2 of the open excavation hall and the shallow pit 3 of the station; Excavation, and the shallow pit 1 of the open excavation hall and the deep pit 2 of the open excavation hall are connected by the shallow-deep pit boundary line 4;

[0036] Step 2, set grouting holes in the pre-buried casing of the underground diaphragm wall 8), and perform grouting 10 in the limestone cracks at the bottom of the wall in combination with the karst cave at the bottom of the wall; insert a grouting pipe into the grouting hole, and the grouting depth It is 9.5m in length from soil-rock interface to 5m below the bottom of D...

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Abstract

The invention discloses a dewatering treatment method for foundation pits of sharply inclined strip-shaped interlayer composite stratum; Well pit area, deepening area for cross-track cables, sump, underground diaphragm wall, inner limestone crack grouting, limestone crack grouting at the bottom of the wall, depressurization well, drainage well, confined water observation well and emergency recharge Wells and turn beam pits. The invention is especially suitable for groundwater treatment of complex stratum foundation pits with mixed filling soil in the upper part of the old city, hard plastic clay in the middle part and bedrock in the lower part. The present invention can be summarized as: "full closure, partial grouting, upper dredging, lowering pressure, bottom collection and drainage, external irrigation". The invention can reduce the number of dewatering wells and water pumping volume, save construction period and cost; at the same time, it can ensure the safety of the foundation pit and the surrounding environment, and obtain good economic and safety benefits.

Description

technical field [0001] The invention relates to the technical fields of construction engineering, urban rail transit, tunnels and underground engineering, in particular to a precipitation treatment method for foundation pits of steeply inclined strip-shaped interbedded bedrock composite strata. Background technique [0002] With the development of urbanization, there are more and more underground foundation pit projects, and the engineering and hydrogeology encountered are becoming more and more complex. The treatment of groundwater is very important to foundation pit engineering, and the successful treatment of groundwater is the prerequisite for the safety of foundation pit engineering. [0003] Composite strata often refer to the stratum with the upper part being the soil layer and the lower part being the rock layer. According to similar engineering surveys at home and abroad, the dewatering of foundation pits in such strata is often conservative in design, increasing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/10E02D19/06
CPCE02D19/06E02D19/10
Inventor 姚西平倪吉栋张存张昌伟胡清茂张国良翟可李龙王怀东梅展军杨晓猛李舸鹏孙浩
Owner 徐州地铁集团有限公司
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