Supportless construction structure and supportless construction method for round deep base pit

A construction method and deep foundation pit technology, which is applied in the direction of foundation structure engineering, excavation, sheet pile wall, etc., can solve the problems of affecting the excavation speed of foundation pit, slow construction speed, waste of resources, etc., and achieve good compressive performance and surrounding area The effect of lower maintenance cost and faster construction speed

Inactive Publication Date: 2012-08-15
张全胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above-mentioned commonly used construction methods all use internal supports, and internal supports will affect the excavation speed in the foundation pit, and need to be replaced and removed, resulting in slow construction speed and waste of resources, resulting in high cost

Method used

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  • Supportless construction structure and supportless construction method for round deep base pit
  • Supportless construction structure and supportless construction method for round deep base pit
  • Supportless construction structure and supportless construction method for round deep base pit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1: An unsupported construction structure of a circular deep foundation pit, which is provided with a circle of three-axis mixing piles 1, a circle of bored piles 2 and several purlins 3, and several of the three-axis mixing piles are surrounded by a circle And a continuous circle, some of the bored piles form a circle with intervals, the circle of three-axis stirring piles is located at the periphery of the circle of bored piles, and each of the purlins They are all circular shapes formed by one-time pouring, the first purlin is a crown beam, and the crown beam is poured on the pile top of the circle of bored cast-in-place piles, and the main reinforcement of the bored cast-in-place piles should be placed in the crown beam, 其余围檩皆浇注于所述一圈钻孔灌注桩的内圈侧面上且与钻孔灌注桩固定连接,相邻围檩在竖直方向上存在间距。

[0066] Except the crown beam, the rest of the purlins are provided with several hanging bars 4 and inserting bars 5 , and the hanging bars and inserting bars are welded to the main bars 2...

Embodiment 2

[0067] Embodiment 2: A kind of unsupported construction method of circular deep foundation pit, carry out according to the following steps:

[0068] (1)场地平整:三轴搅拌机施工前,必须先进行场地平整,清除施工区域的表层硬物和地下障碍,为了加强承重荷载可采用垫钢板方法便于桩架行走;

[0069] (2) Measurement and setting out:

[0070] a. According to the measuring point provided by the construction unit as the reference point, arrange on-site measurement control points and elevation control points;

[0071] b. The measurement control point is arranged at the center of the foundation pit enclosure structure plane;

[0072] c. Measure and release the position of each three-axis mixing pile and each drilled cast-in-place pile pile by pile;

[0073] d. The three-axis stirring pile is placed on the central axis, slotted according to the circle, and then the central axis air hole is measured to control the pile position;

[0074] (3) Three-axis mixing pile construction

[0075] a. According to the positioning of the three-axis mixing pile, excava...

Embodiment 3

[0105] Example 3: Take KONE Elevator (Kunshan) test tower foundation pit (the foundation pit completed floor pouring on March 15, 2012, and is now undergoing construction of the main structure), the project is located in the high-tech industrial park of Kunshan City, Jiangsu Province Inside, the height of the tower is about 235m above the ground, and it will become the tallest elevator test tower in the world after completion. The excavation depth of the foundation pit of this project is 15.10m, the plane shape is circular, and the diameter is 45.8m. Take the following construction steps:

[0106](1) Site leveling: site leveling, removal of surface hard objects and underground obstacles in the construction area;

[0107] (2) Measurement and setting out:

[0108] a. According to the measuring point provided by the construction unit as the reference point, arrange on-site measurement control points and elevation control points;

[0109] b. The measurement control point is arr...

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Abstract

The invention discloses a supportless construction structure and a supportless construction method for a round deep base pit. The supportless construction method comprises the steps as follows: carrying out three-shaft stirring pile construction, cast-in-situ bored pile construction, earth mass grouting reinforcement, earth excavation, first enclosing purlin construction, subsequent earth excavation, next enclosing purlin construction, subsequent earth excavation and cushion layer and bottom plate construction so as to obtain a deep base pit bracing structure mainly comprising a circle of three-shaft stirring pile, a circle of cast-in-situ bored pile and a plurality of enclosing purlins. The bracing structure has no supporting structure; the arch effect of the earth mass is utilized; the earth pressure on the bracing structure is reduced; the external load is converted into the internal pressure on the enclosing purlins by the arch effect of the enclosing purlins at the same time; the characteristic of good pressure resistance of concrete is brought into full play; and as no supports are provided, the processes of dismounting and replacing the supports are removed, so that the maintenance expense of the base pit is reduced and the construction speed is quick.

Description

technical field [0001] The invention belongs to the field of building construction, and in particular relates to a construction structure and a construction method of a circular deep foundation pit. Background technique [0002] With the rapid development of China's economy and the acceleration of urbanization, land resources are becoming more and more tense. In order to make full use of land resources and alleviate the difficulties of urban land use, it has become inevitable for buildings to develop high-altitude and underground. In the process of development and utilization of underground space, Deep foundation pit engineering has become an unavoidable problem. Foundation pits are an important part of high-rise buildings and large-scale municipal projects. In the reconstruction of old cities, foundation pit engineering is often concentrated in the center of the city. The foundation pit project is a large-scale soil excavation project. The most direct consequence is the red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D5/46E02D5/36
Inventor 张全胜
Owner 张全胜
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