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Construction method for deep foundation pit supporting and protecting system

A construction method and technology for deep foundation pits, which are applied in basic structure engineering, excavation, sheet pile walls, etc., can solve the problems of high construction cost, hidden safety hazards of reinforced structures, long construction period, etc., saving construction period, and simple and easy construction technology. , cost-saving effect

Active Publication Date: 2016-10-26
JIANGSU JIANGZHONG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there are still certain problems in the implementation of the above methods: 1. The above implementation methods all have high construction costs and long construction periods; 2. There are certain safety hazards in the reinforced structure

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] The construction method of the deep foundation pit supporting support system in this embodiment, the specific steps are as follows:

[0030] (1) Positioning: After the excavation of the trench, measure the elevation, and draw a mark on the surrounding pile; then the drilling rig is accurately positioned, and the base is leveled, and the inclination of the drill pipe is checked with a compass. The positioning deviation of the drilling hole is less than 5cm, the deviation of the hole inclination is less than 3°, the deviation of the pile diameter does not exceed 2cm, and the construction is strictly according to the design pile length;

[0031] (2) Hole forming: Drainage ditches and circulating slurry pools should be dug in the site before the hole forming construction, so as to avoid the construction being affected by the random discharge of mud. Multi-row and multi-directional rotary jet mixing and reinforced piles should be drilled with special drilling rigs. After the...

Embodiment 2

[0041] This embodiment is illustrated by an engineering example. The multi-row multi-directional rotary jet mixing reinforced row pile + inclined steel pipe support system foundation pit combination support pile is used in the deep foundation pit construction of the department store in the No. 3 plot of Maoyetiandi, Taizhou. Because the project is limited by the construction site, the use of pile row support has great advantages. The high rigidity of the pile row can effectively ensure the safety of the foundation pit and the surrounding environment; the pile row construction and earthwork excavation are staggered, which can shorten the exposure time of the foundation pit , Effectively guarantee the construction period; the steel support construction technology is simple and easy, it has good deformation control ability and high stability, and is an innovative technology applied in deep foundation pit support in recent years. Compared with traditional support, it has great econ...

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Abstract

The invention relates to a construction method for a deep foundation pit supporting and protecting system. According to the construction method, multi-row multi-direction jet-grouting mixing reinforced piles are combined with foundation pit composite supporting and protecting piles in a diagonal steel pipe supporting system, and the multi-row multi-direction jet-grouting mixing reinforced piles can be used for reinforcing adjacent soil, thereby forming relatively-high-strength anchor piles; hot-rolled seamless steel pipes are adopted for diagonal steel pipe supporting; and generally, steel pipes with the pipe diameter of 400 mm, 600 mm or 800 mm are adopted. The construction method has the advantages that compared with a traditional row pile supporting scheme, the scheme that the multi-row multi-direction jet-grouting mixing reinforced piles are combined with the foundation pit composite supporting and protecting piles in the diagonal steel pipe supporting system can save the cost by 20-50% and shorten the construction period by 40% when being used for excavation of a foundation pit with the excavation depth of 10-15 m and the area of 10,000 square meters or above; the steel supporting construction technique is simple and feasible, and can be reused; and accordingly, compared with a general supporting and protecting structure, the deep foundation pit supporting and protecting system is lower in cost and more remarkable in comprehensive benefit.

Description

technical field [0001] The invention belongs to the field of construction, and relates to a construction method for building foundation pits, in particular to a construction method for a deep foundation pit support system. Background technique [0002] In the construction industry, a foundation pit refers to the space below the ground excavated for the construction of building foundations and basements. The foundation pit is a temporary pit excavated for the foundation of the building. It is a temporary project. Its function is to provide a space for the foundation masonry to be carried out in the position specified by the design. In general, a foundation pit with an excavation depth greater than or equal to 5M is called a deep foundation pit. [0003] At present, most of the deep foundation pit construction in my country adopts reinforced concrete support as the support system, that is, a circle of reinforced concrete structure pouring piles is arranged around the foundati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D5/22
CPCE02D5/22E02D17/04
Inventor 蔡雪松田俊沈永龙张松祥洪晖王良银范海辉蔡栋沈百寿张乃建沙凌云
Owner JIANGSU JIANGZHONG GROUP
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