Sealing method after excavation of deep foundation pit downfall pipe well

A technology for downfall pipes and deep foundation pits, which is applied in infrastructure engineering, construction, etc., can solve problems such as inability to form a vacuum and affect the use efficiency of downfall vacuum tube wells, and achieve the effects of easy operation, convenient installation and disassembly, and cost savings

Active Publication Date: 2021-01-15
CHINA MCC20 GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Deep foundation pits need to adopt dewatering measures before excavation. In order to improve the effectiveness of dewatering measures, a vacuum is applied in the downwater tube well. However, after excavation of deeper foundation pits, the filter section of the vacuum tube well hole will be dug through, resulting in vacuum dewatering. The inside of the tube well is connected to the outside, and a vacuum cannot be formed, which affects the use efficiency of the dewatering vacuum tube well

Method used

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  • Sealing method after excavation of deep foundation pit downfall pipe well
  • Sealing method after excavation of deep foundation pit downfall pipe well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1, figure 1 Under the condition that the earthwork is not excavated, the well cap is buckled on the downcomer well 6 at this time. The well cap has threading pipe 4, drain pipe 5 and vacuum pipe 3 respectively. The water pump drainage pipe in the tube well and the drainage pipe outside the well, the vacuum tube is connected to the vacuum pump outside the well, and the plastic film 7 is wound and sealed between the well cap and the downfall tube well, and the wrapped film will be automatically adsorbed on the outer wall of the downwater well and the outer wall of the well cap Play a sealing role.

Embodiment 2

[0012] Example 2, figure 2 After excavating the foundation pit, dig through the clay sealing layer on the upper part of the filter section. At this time, the inside of the dewatering well is connected with the outside atmosphere through the permeable filter material, and a vacuum cannot be formed in the dewatering well. At this time, the well cap is buckled in according to working condition 1 On the downcomer well, dig out a layer of the filter section at the bottom of the foundation pit and put on the filter section sealing gland and seal it with clay. The upper part of the filter section sealing gland is wrapped with a plastic film to seal the downwater tube well. The vacuum downwater tube well is in the case of working condition 2 It can ensure that the well is sealed to form a vacuum, and give full play to the effectiveness of the vacuum downwater tube well. Working condition 2 can be used repeatedly in the case of multi-layer excavation, so that the deep foundation pit do...

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Abstract

The invention relates to deep foundation pit construction, in particular to a precipitation pipe well in a deep foundation pit. According to the method for closing a precipitation pipe well after excavating of a deep foundation pit, a closing well cap and a filter section sealing gland are included; the sealing gland is manufactured by plastic or glass fiber reinforced plastics in a shaped mode, the closing well cap is manufactured according to the diameter of the precipitation pipe well, and the filter section sealing gland is manufactured according to the diameter of the precipitation pipe well and the diameter of a borehole filter section; in the unexcavated state of earthwork, the well cap is buckled on the precipitation pipe well at the moment, and the well cap is provided with a threading pipe, a drainage pipe and a vacuum pipe; the threading pipe is connected with a water pump power source in a precipitation pipe, the drainage pipe is connected with a water pump drainage pipe inside the precipitation pipe well and a drainage pipe outside the well, and the vacuum pipe is connected with a vacuum pump outside the well; and the well cap and the precipitation pipe well are sealedin a plastic film winding mode, and the wound film is automatically adsorbed on the outer wall of the precipitation well and the outer wall of the well cap under the vacuum effect to achieve the sealing effect. According to the method for closing the precipitation pipe well after excavating of the deep foundation pit, the vacuum degree of the precipitation pipe well can be ensured, mounting and demounting are convenient, and the cost is saved.

Description

technical field [0001] The invention relates to deep foundation pit construction, in particular to a deep foundation pit downwater well. Background technique [0002] Deep foundation pits need to adopt dewatering measures before excavation. In order to improve the effectiveness of dewatering measures, a vacuum is applied in the downwater tube well. However, after excavation of deeper foundation pits, the filter section of the vacuum tube well hole will be dug through, resulting in vacuum dewatering. The inside of the tube well is connected to the outside, and a vacuum cannot be formed, which affects the use efficiency of the dewatering vacuum tube well. Contents of the invention [0003] The invention aims at overcoming the defects of the prior art, and provides a method for sealing a deep foundation pit downfall pipe well after excavation. The invention can ensure the vacuum degree of the downcomer well, is convenient to install and disassemble, and saves cost. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/10
CPCE02D19/10
Inventor 杨前
Owner CHINA MCC20 GRP CORP
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