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Dewatering and drainage structure of foundation pit deep drop area and construction method thereof

A construction method and technology for dredging and drainage, which can be used in infrastructure engineering, construction, etc., can solve the problems of unavoidable water gushing, labor and time consumption, and achieve the effect of avoiding water gushing in foundation pits.

Inactive Publication Date: 2014-12-03
SHANGHAI NO 7 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the foundation pit depth area where the bottom of the pit is not closed and the precipitation is not in place, the structure of grouting into the pit after water gushing or repairing the dewatering well can not avoid the phenomenon of water gushing, and the construction method consumes manpower and time. The purpose of the present invention It is to provide a drainage structure and construction method in the depth area of ​​the foundation pit. The drainage layer and the reinforced cement pipe filled with gravel are used to realize the collection and drainage of the groundwater in the foundation pit. The drainage of the groundwater is more thorough and avoids the subsequent construction water gushing phenomenon

Method used

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  • Dewatering and drainage structure of foundation pit deep drop area and construction method thereof
  • Dewatering and drainage structure of foundation pit deep drop area and construction method thereof
  • Dewatering and drainage structure of foundation pit deep drop area and construction method thereof

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Embodiment 1

[0028] Example 1: Combining Figure 6 Illustrate the draining and draining structure of the depth area of ​​the foundation pit in this embodiment. In the prior art, a cushion layer, a waterproof layer and a structural bottom plate are successively laid in the foundation pit from bottom to top, wherein the waterproof layer is made of a waterproof coiled material laid on the cushion layer become. In the hydrophobic drainage structure of the present invention, a hydrophobic layer 21 is arranged under the cushion layer 22, and the reinforced cement pipe 10 is vertically arranged on the lower part of the hydrophobic layer 21, and is closely attached to the hydrophobic layer 21; and the filter tube 13; the filter tube 13 is vertically arranged in the middle of the cavity of the reinforced cement pipe 10, that is to say, the outer diameter of the filter tube 13 is smaller than the inner diameter of the reinforced cement tube 10, and the length of the filter tube 13 is shorter than th...

Embodiment 2

[0034] Embodiment 2: Combination Figure 1 to Figure 7 Illustrate the construction method of the drainage structure of foundation pit fall depth zone of the present invention, concrete steps are as follows:

[0035] S101: if figure 1 As shown, excavate to the lowest elevation of the depth area of ​​the foundation pit, and grade the foundation pit according to the lowest elevation (or excavate to the lowest elevation of the group of foundation pits, and grade the group of pits according to the elevation of the deepest pit), Such as figure 2 As shown, the reinforced cement pipe 10 is placed at the lowest elevation through the caisson method. Specifically, the bottom of the pit is excavated. The top of the reinforced cement pipe 10 is lower than the elevation of the position where the cushion layer is to be laid;

[0036] S102: if image 3 As shown, a gravel layer 11 is laid at the bottom of the inner cavity of the reinforced cement pipe 10 to prevent sand from pouring in a...

Embodiment 3

[0045] Embodiment three: different from embodiment two, such as Figure 4 As shown, in step S103, the edge of the bottom end of the hydrophobic layer 21 is located at a certain distance below the top of the reinforced cement pipe 10, so that the hydrophobic layer 21 wraps the top of the reinforced cement pipe 10, and prevents the sand and soil outside the reinforced cement pipe 10 from being mixed with groundwater. Flow into the reinforced cement pipe 10, and then block the filter pipe 13 of the steel pipe well, causing problems such as poor groundwater precipitation.

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Abstract

The invention discloses a dewatering and drainage structure of a foundation pit deep drop area and a construction method thereof, and relates to the foundation pit engineering field. The dewatering and drainage structure of the foundation pit deep drop area and the construction method thereof aim at solving the problems that when an existing pit grouting or supplement drilling dewatering well structure and a method thereof perform foundation pit dewatering, a water burst phenomenon can not be avoided, and manpower and time are consumed. The dewatering and drainage structure of the foundation pit deep drop area comprises a drainage layer arranged below a cushion layer, a reinforcement cement pipe adhered to the lower portion of the drainage layer and a steel tube well formed by steel tubes and a filter tube, wherein the filter tube is arranged in a cavity of the reinforcement cement pipe, the reinforcement cement pip wraps the filter tube after filled with gravel, and the steel tubes run through all layers and a structure bottom plate. The construction method of the dewatering and drainage structure of the foundation pit deep drop area includes steps: 1) arranging the reinforcement cement pipe on a position of the lowest elevation; 2) laying a gravel layer at the bottom of the reinforcement cement pipe, placing the steel tube well on the gravel layer, and filling the reinforcement cement pipe with the gravel; 3) laying the drainage layer, the cushion layer and a waterproof layer on the reinforcement cement pipe; 4) feeding a water pump into the filter tube for drawing water; 5) obtaining the structure bottom plate through pouring, and placing the tops of the steel tubes above the structure bottom plate; 6) fetching out the water pump and blocking off the steel tube well.

Description

technical field [0001] The invention relates to the technical field of foundation pit engineering, in particular to a drainage structure and a construction method for a partial depth area of ​​a foundation pit. Background technique [0002] With the rapid development of the modern construction industry, there are more and more high-rise and super high-rise buildings. Due to the large load on the upper part of the high-rise and super high-rise buildings, most of them adopt compensatory foundations. Generally, multi-storey basements are set up to facilitate the stability of the buildings, resulting in a large foundation depth. , the excavation of the foundation pit is deep, especially when the deep foundation pit is excavated in the area with a high groundwater level, the soil aquifer is cut off, and the groundwater will continue to seep into the foundation pit, causing quicksand, slope instability or a decrease in the bearing capacity of the foundation. Therefore, before or d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/20
Inventor 孙祖根郑杰秦立标王沛斌
Owner SHANGHAI NO 7 CONSTR