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Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof

A construction method and deep foundation pit technology, which is applied in the direction of infrastructure engineering, excavation, protection devices, etc., can solve the problems of difficult targeted compensation grouting, difficulty in judging leaking parts, high grouting costs, etc., to solve the problem of pit bottom Uplift, ensure water isolation effect, increase earth pressure effect

Active Publication Date: 2015-10-28
RANKEN RAILWAY CONSTR GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of this method is that the amount of grouting is very large, especially when the confined water layer is thick and buried deep, the cost of grouting is quite high
Once the grouting body has local quality problems, water leakage occurs in the basement, and groundwater rushes into the rock and soil layer above the basement. huge, slow

Method used

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  • Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof
  • Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof
  • Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as Figure 4~5A deep foundation pit bottom seal and water-stop structure in strong permeable stratum is shown, including an underground diaphragm wall 1, an underwater plain concrete board 2, a reinforced concrete partition wall 3, an uplift pile 4 and an inner support 6, and the underground diaphragm wall 1 (equivalent to The water-stop curtain) is placed around the foundation pit by pouring, the inner support 6 is supported on the underground diaphragm wall 1, and the reinforced concrete partition wall 3 is arranged between the underground diaphragm walls 1, and the reinforced concrete partition wall 3 is formed through the underground diaphragm wall Formed by construction, the reinforced concrete partition wall 3 and the underground diaphragm wall 1 on each two sides are enclosed at the base to form a pouring warehouse, and the uplift pile 4 is poured on the base in the warehouse, and the reinforced concrete partition wall 3 and the underground diaphragm wall 1 ...

Embodiment 2

[0048] Such as Figure 4~5 In the bottom-sealing and water-stopping structure of a deep foundation pit in a strong water-permeable formation, on the basis of Example 1, a 0.5m-thick crushed stone layer 5 is laid on the underwater plain concrete slab 2, and a drainage blind pipe is arranged in the crushed stone layer. Eliminate the seepage water in the warehouse by separate warehouses to ensure the dry operation of the floor construction.

Embodiment 3

[0050] Such as Figure 4~5 In the bottom-sealing and water-stopping structure of a deep foundation pit in a strong water-permeable stratum, on the basis of Example 1, a groove is provided at the joint between the reinforced concrete partition wall 3 and the underwater plain concrete board 2; A groove is provided at the connection between the pile 4 and the underwater plain concrete board 2; a groove is provided at the connection between the underground diaphragm wall 1 and the underwater plain concrete board 2. In order to increase the shear resistance between the underwater plain concrete slab 2 and other support interfaces and ensure the waterproof effect.

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Abstract

The invention discloses a strongly-permeable stratum deep foundation pit bottom sealing water stopping structure, which comprises diaphragm walls, underwater plain concrete boards, reinforced concrete partition walls, uplift piles and inner supports, wherein the diaphragm walls are arranged around the foundation pit througgh casting; the inner supports support the diaphragm walls; the reinforced concrete partition walls are formed on the foundation pit below the diaphragm walls through casting; the reinforced concrete partition walls and the diaphragm walls of each two faces form a casting block in a surrounding mode on the foundation base; the uplift piles are casted on the foundation base inside the block; each underwater plain concrete board is formed through casting at each block opening formed by the reinforced concrete partition walls and the diaphragm walls in a surrounding mode; and the uplift piles are firmly embedded in the underwater plain concrete boards. The underwater plain concrete boards enhance overall strength and ridigity of the foundation pit bottom, dual effects of reinforced pit bottom and permeation prevention are provided, influences on stability of the pit bottom by high pressure water and raised pit bottom caused by excavation of the foundation pit can be effectively solved, and lateral displacement of the pit wall and settlement deformation of the surrounding enviornment can be well reduced.

Description

technical field [0001] The invention relates to the field of deep foundation construction in highly permeable strata, in particular to a bottom-sealing and water-stopping structure for deep foundation pits in highly permeable strata and a construction method thereof. Background technique [0002] At present, in deep foundation pit engineering, three methods are usually used to solve the engineering problems caused by confined water, such as precipitation outside the pit, vertical partition of curtain, and full grouting of the base. [0003] The first such as figure 1 The method of dewatering outside the pit, the design idea of ​​this method is: adopt the underground diaphragm wall as the enclosure structure, after the enclosure structure is completed, first carry out the construction of reducing the confined water inside and outside the pit, and when the confined water head drops to the design requirement Excavation of the foundation pit will be carried out after the elevat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04E02D19/18E02D19/16E02D31/02E02D31/12
Inventor 刘建伟卢致强潘秀明雷崇红吕高峰张建海贺长俊崔志杰郝志宏李铁生申小兵付波张美琴孟伟李明磊刘静涛刘卫华谭万忠贾飞宇高雄鹰陈琪娇
Owner RANKEN RAILWAY CONSTR GROUP
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