A method of excavating a foundation pit

A technology of foundation pit and extension direction, which is applied in excavation, foundation structure engineering, construction and other directions, which can solve problems such as settlement and achieve the effect of reducing costs

Active Publication Date: 2021-11-02
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +1
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a foundation pit excavation method to solve the technical problem that using the dewatering method in the prior art to drain groundwater may easily cause a large area of ​​settlement outside the pit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method of excavating a foundation pit
  • A method of excavating a foundation pit
  • A method of excavating a foundation pit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] During construction, first determine the seepage direction of groundwater inside the foundation pit area to be excavated (such as figure 1 (indicated by the middle arrow), and then construct the foundation pit enclosure structure 1, and excavate the soil layer above the groundwater level, wherein, the area surrounded by the foundation pit enclosure structure 1 is the area to be excavated. It should be noted that the foundation pit enclosure structure is a conventional structure for foundation pit construction.

[0043] Such as figure 1 As shown in , the area of ​​the foundation pit to be excavated is divided into n excavation sections with roughly equal areas. Section I starts from the downstream of the groundwater seepage direction, and at the junction of sections I and II a 1 Precipitation zone 2 is set at the position, and precipitation zone 2 intersects with the groundwater seepage direction inside the foundation pit area to be excavated.

[0044] Such as Figure...

Embodiment 2

[0053] The difference from Example 1 is that the precipitation zone is composed of a plurality of precipitation wells, each precipitation well is arranged at intervals along the direction perpendicular to the groundwater seepage, the precipitation wells are filled with filter material, and a filter pipe is arranged in the filter material, and the filter pipe is connected with a drainage The drain pipe is connected with a water pump, and the water pump is used to pump out the groundwater in the dewatering well.

Embodiment 3

[0055] The difference from Example 1 is that after Section I is completed, the junction a of Sections I and II is removed first 1 The water pump, drainage pipe, water filter pipe and filter material at the place, and then at the junction of Sections II and III a 2 Dig the catchment ditch at the place, and make the junction a 1 The drainage pipes, filter pipes and filter materials at the place are put into the gutter to form a precipitation belt, and then the second section is excavated.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for excavating a foundation pit. The method for excavating a foundation pit comprises the following steps: step 1, setting a precipitation zone in the area of ​​the foundation pit to be excavated, and the direction of groundwater seepage in the area between the precipitation zone and the area of ​​the foundation pit to be excavated Intersect; Utilize the groundwater in the precipitation belt setting area of ​​described precipitation belt suction, before groundwater is blocked to precipitation belt; Step 2, excavate the area that is positioned at the downstream of precipitation belt on the groundwater seepage direction; Step 3, in the area of ​​precipitation belt A precipitation zone is set on the side upstream of the groundwater seepage direction; step 4, excavating an area located downstream of the newly set precipitation zone in the groundwater seepage direction. This foundation pit excavation method only dewaters in the foundation pit to avoid large area settlement outside the pit.

Description

technical field [0001] The invention relates to a foundation pit excavation method. Background technique [0002] When the foundation pit is excavated, groundwater is often encountered, and the method generally adopted for the treatment of groundwater is precipitation. Precipitation in cohesive soil layer, due to the small compressive modulus of the soil layer, the effective stress in the soil layer increases during the precipitation process, which may cause a large area of ​​additional settlement on the ground, resulting in deformation of surrounding buildings or underground pipelines or even destroy. [0003] If a closed water-stop curtain is used, the inside of the foundation pit still needs to be drained to drain the existing groundwater; if a non-closed water-stop curtain is used, precipitation needs to be done inside and outside the pit at the same time. Above-mentioned two kinds of water-stop curtains all have complex construction technology and high cost. Content...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02E02D19/10E02D19/08E02D19/22
CPCE02D17/02E02D19/08E02D19/10E02D19/22
Inventor 石岭张文龙高飞龙孟凡立刘璞马志强王玉龙康伟蒋维周宾李永辉
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap