Protective construction method of excavating large area deep foundation pit in running sand confined water soil layer

A construction method and technology of deep foundation pits, applied in excavation, foundation structure engineering, sheet pile walls, etc., can solve problems such as construction period, large increase in cost, difficulty in guaranteeing construction quality, etc., so as to reduce construction difficulty and cost, and reduce construction cost. cycle effect

Active Publication Date: 2011-08-24
CHINA MCC20 GRP CORP
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, the construction period and cost increase are relatively large, and it is difficult to g

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
  • Protective construction method of excavating large area deep foundation pit in running sand confined water soil layer
  • Protective construction method of excavating large area deep foundation pit in running sand confined water soil layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Such as figure 1 Shown, the quicksand pressurized water soil layer of the present invention excavates and protects construction method of large area deep foundation pit, quicksand pressurized water soil layer is the first layer plowing and filling soil layer 1, the second layer of clay layer 2, the third layer of silty clay Sandwich silt layer 3, the 4th layer fine sand layer 4, this method comprises the following steps:

[0017] Step 1. The precipitation depth of deep foundation pit excavation is controlled within 500-1000 mm below the excavation surface to reduce the impact on the environment around the deep foundation pit;

[0018] Step 2: Set up a circle of sand-free tube wells 5 around the outside of the deep foundation pit to reduce the height of the pressurized water head in the fourth layer of powder and fine sand layer 4. The sand-free tube wells 5 are 2 meters away from the edge of the deep foundation pit, and the depth is greater than that of the deep foundat...

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 discloses a protective construction method of excavating a large area deep foundation pit in a running sand confined water soil layer. The method comprises the steps of: firstly, controlling the precipitation depth of the deep foundation pit in a range of 500mm to 1000mm below the excavation surface; disposing a circle of sandless tubular wells around the outer periphery of the deep foundation pit, wherein each sandless tubular well is 2 meters far from the deep foundation pit edge, 6 to 10 meters deeper than the bottom of the deep foundation pit, and 15 to 20 meters far from the neighboring sandless tubular well; laying reinforcing steel mesh sheets and disposing a circle of light-duty wellpoints on an inward side slope of the deep foundation pit; after starting the excavation, arranging a soil nail wall provided with weep holes for anchoring on a side slope of silty sand layer and silty clay layer with silt seam. By the method in the invention, the excavation of the large area deep foundation pit in the running sand confined water soil layer is ensured to be smooth, with no need to enlarge the excavation area. The difficulty of construction and the construction cost are lowered and the construction period is shortened.

Description

technical field [0001] The invention relates to a construction method for excavating and protecting a large-area deep foundation pit in a quicksand pressurized water soil layer. Background technique [0002] Deep foundation pit excavation enclosure is an important process in the process of deep foundation pit excavation. Improper enclosure will cause various failures in the excavation process, and seriously lead to the collapse of deep foundation pits; The enclosure work is particularly important. For example, the soil layer structure at the excavation site is the first layer of cultivated and filled soil layer, the second layer of clay layer, the third layer of silty clay sandwiched with silt soil layer, and the fourth layer of silty fine sand layer; The sand layer is a confined aquifer with a water head height of 6-7 meters and is located in the excavation layer of the deep foundation pit; if the foundation pit enclosure measures at this part are not appropriate, the excav...

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
IPC IPC(8): E02D17/02E02D17/04E02D19/20E02D17/20E02D5/74
Inventor 杨前
Owner CHINA MCC20 GRP CORP
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