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Enclosure structure for ultra-large deep foundation pit soft soil and construction method

A technology of enclosure structure and construction method, which can be applied in basic structure engineering, excavation, construction, etc., can solve problems such as increasing construction difficulty and hidden safety hazards, and achieve the effect of reducing construction cost

Active Publication Date: 2022-07-08
CHINA RAILWAY CONSTR ENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the requirement of bearing capacity, it is necessary to set up some beam-slab members with super large cross-section, which increases the difficulty of construction and hidden safety hazards

Method used

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  • Enclosure structure for ultra-large deep foundation pit soft soil and construction method
  • Enclosure structure for ultra-large deep foundation pit soft soil and construction method
  • Enclosure structure for ultra-large deep foundation pit soft soil and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In order to solve the above problems, the present embodiment provides an enclosure structure for super-large deep foundation pit soft soil. The enclosure structure adopts an unsupported enclosure system. The ”-shaped cantilever is used as the main force-bearing member, and six bolts are added for structural reinforcement.

[0047] like figure 1 The cantilever structure shown is set in the soil around the foundation pit. The specific cantilever structure includes: multiple groups of double-row pile units 1 distributed in parallel along the edge of the foundation pit according to the enclosure requirements. And the double-row pile unit 1 is a "well"-shaped cantilever structure composed of double-row piles and at least two connecting beams. It also includes: multiple sets of anchor rods 104 that are pre-buried in the body and generate an outward tensile force for the double-row piles, which have better overturn resistance than the general unsupported enclosure structure,...

Embodiment 2

[0054] The present embodiment discloses a construction method for a soft soil enclosure structure for a super-large deep foundation pit, comprising the following steps:

[0055] Step 1, construction method pile construction;

[0056] Step 2. Construction of underground buttresses;

[0057] Step 3. Construction of the first connecting beam;

[0058] Step 4. Excavation of soil between piles;

[0059] Step five, anchor construction;

[0060] Step 6. Construction of the second connecting beam; generate a "well"-shaped cantilever structure;

[0061] Step seven, anchor construction.

[0062] The above steps are described one by one through the following text description.

[0063] the same steps image 3 It includes the following processes:

[0064] Step 101, construction preparation; including: site preparation and slurry preparation. The site preparation is further as follows: before construction, the original underground pipeline and foundation should be verified against t...

Embodiment 3

[0111] Based on Example 1 and Example 2, the first-phase project of a special community for science and technology entrepreneurship is located in the Hexi area of ​​a city. , the excavation depth is 14m, the soil is mainly silty and silty clay, and the underground three-layer structure is designed. Six bolts are used for structural reinforcement. Because it is an unsupported enclosure system, there is no concrete support inside the foundation pit, so that the thickness of the earthwork can be determined according to the characteristics of the excavator, which reduces the number of layers of the earthwork and speeds up the excavation efficiency of the earthwork. The construction period is reduced, which fundamentally saves the construction period. According to the needs of the project, the technicians have studied the construction technology of double-row PCMW construction method piles, soil excavation between piles, two coupling beams and underground buttresses in the enclosu...

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Abstract

The invention discloses an enclosure structure for ultra-large deep foundation pit soft soil and a construction method, and belongs to the technical field of building construction. Comprising a cantilever structure arranged in a soil body around a foundation pit; the cantilever structure comprises a plurality of groups of double-row pile units which are distributed in parallel along the edge of a foundation pit according to enclosure requirements; each double-row pile unit is of a #-shaped cantilever structure composed of double-row piles and at least two connecting beams. A #-shaped cantilever composed of double rows of PCMW construction method piles and two connecting beams is adopted as a main stress component, a plurality of anchor rods are additionally arranged for structural reinforcement, and meanwhile a plurality of underground buttresses are evenly arranged on the periphery of a foundation pit to serve as a safety reserve.

Description

technical field [0001] The invention belongs to the technical field of building construction, and particularly relates to an enclosure structure and a construction method for super-large deep foundation pit soft soil. Background technique [0002] With the continuous advancement of urbanization, buildings are developing in the direction of higher height and deeper foundation, and the area of ​​the foundation pit is getting larger and deeper. In the deep foundation pit enclosure system at home and abroad, the inner support enclosure system is a main enclosure structure system, and the technology has matured. However, on the surface of the embodiment example in recent years, when the area and depth of the foundation pit reach a certain value, the following problems will occur in the inner support envelope: [0003] After calculation, when the area of ​​the foundation pit exceeds 35,000 square meters, the cost for the enclosure structure and the area of ​​the foundation pit in...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/74E02D5/30E02D5/46E02D5/58
CPCE02D17/04E02D5/74E02D5/30E02D5/46E02D5/58Y02A30/60
Inventor 杨春生陆剑峰孙泽昌李超芮兴龙郑奎智张健马伟李苏畅吴建录程军宫文浩
Owner CHINA RAILWAY CONSTR ENG GROUP