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Profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system and construction method thereof

A technology of foundation pit support and double-row piles, which is applied in foundation structure engineering, excavation, construction, etc., can solve problems such as prone to lateral collapse, achieve good support effect, prevent lateral bulging, and simple structure Effect

Pending Publication Date: 2017-12-22
GUANGDONG CONSTR ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a support system for foundation pits of double-row piles inserted in the back of the outer row, which plays a good role in vertical and lateral support for foundation pits before earthwork excavation and backfilling of foundation pits, and The construction method of the foundation pit support system is proposed, which realizes the vertical excavation of the foundation pit earthwork, and effectively solves the problem that the overhanging part of the foundation pit support system is prone to lateral collapse before the earthwork is backfilled during the vertical excavation process of the foundation pit. Safety hazards

Method used

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  • Profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system and construction method thereof
  • Profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system and construction method thereof
  • Profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system and construction method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to figure 1 with Figure 10 , a support system for a foundation pit with outer-row and rear-inserted steel double-row piles, which includes a crown beam 1 , support piles 2 , stirring piles 3 , waist beams 4 and support columns 5 arranged in the foundation pit.

[0041] A number of mixing piles 3 are arranged vertically and horizontally along the edge of the foundation pit to form a water-stop curtain, and several supporting piles 2 are arranged vertically and horizontally along the side of the water-stop curtain to form a support body. The cast-in-situ pile structure is composed of a steel casing 21, a steel cage 22 inserted in the steel casing 21, and concrete poured in the steel casing 21. The mixing pile 3 has a section above the supporting pile 2.

[0042] The side of the crown beam 1 is connected to the side of the water-stop curtain, and the bottom is connected to the top of the support body. The crown beam 1 adopts a reinforced concrete structure and is c...

Embodiment 2

[0047] refer to Figure 2 to Figure 10 , the construction method of the outer row and rear insertion type steel type double row pile foundation pit support system of embodiment 1, which comprises the following construction steps.

[0048] Step 1, refer to figure 2 According to the conventional technology construction mixing pile 3, after all the mixing piles 3 become piles to form a water-stop curtain, an earthwork excavation is carried out, and the earthwork excavation reaches the elevation position of the bottom surface of the waist beam 4.

[0049] Step 2, refer to Figure 3 to Figure 6 , construct the support pile 2 and the support column 5 in sequence;

[0050] Step 2.1, refer to image 3 , dig the support pile hole at the side support pile position of the water-stop curtain, sink the steel casing 21 into the support pile hole so that the top is at the elevation of the bottom surface of the crown beam 1, place the steel cage 22 in the steel casing 21 and make it 50 m...

Embodiment 3

[0065] The difference between the construction method of the outer row and rear inserted double-row pile foundation pit support system of this embodiment and the embodiment 2 lies in the specific construction process of the hanging net sprayed concrete layer 6, and the construction of the step 3.3 and step 4.4 is used to replace the embodiment 2 In step 5, complete the hanging net sprayed concrete layer 6 in the foundation pit support system of embodiment 1, specifically:

[0066] Step 3.2 also includes step 3.3 after step 3.2 in step 3 of embodiment 2. The metal hanging net is hung above the waist beam 4 on the side of the mixing pile of the water-stop curtain above the waist beam 4, and the thickness of 100mm to 150mm is formed by spraying concrete on the metal hanging net. Hanging net sprayed concrete layer 6.

[0067] Step 4.3 also includes step 4.4 after step 4.3 in step 4 of embodiment 2. The metal hanging net is hung between the waist beam 4 and the crown beam 1 on the ...

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Abstract

The invention provides a profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system. The system comprises a crown beam, a supporting body composed of multiple supporting piles and a waterproof curtain composed of multiple stirring piles. Especially, the system comprises a waist beam and supporting columns. The waist beam is arranged on the side of the waterproof curtain and above the crown beam. The supporting columns are vertically arranged at the tops every other one to three supporting piles. The lower portions of the supporting columns are inserted into the crown beam and the supporting piles in a penetrating manner, a top seat connected with the waist beam is arranged at the top of each supporting column, transverse tie bars are welded to the upper ends of the supporting columns and connected to a waist beam steel bar or penetrate the waist beam to be planted in the stirring piles. A construction method of the foundation pit supporting system is provided. The construction method comprises the steps that firstly, after construction of the waterproof curtain, earth excavation is carried out for the first time; secondly, the supporting piles are constructed, and after concrete pouring of the supporting piles is completed, the supporting columns are constructed immediately; thirdly, the waist beam and the top seats of the supporting columns are constructed; and fourthly, the crown beam is constructed after earth excavation of the second time, and construction is completed. According to the system, the problem of the potential safety hazard that an overhanging part of the foundation pit supporting system is prone to suffering from lateral collapsing before earthwork backfilling is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a support system for foundation pits of buildings and a construction method for the support system. Background technique [0002] Before the earthwork excavation of the foundation pit of the building, in order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, it is necessary to carry out the construction of the support system on the side wall of the foundation pit and its surrounding environment to play a role in supporting the foundation pit. , reinforcement and protection. Existing support systems usually include several columns and support beams. The columns are vertically arranged in the foundation pit, and the support beams are horizontally supported on the top of the foundation pit through the columns. The construction steps of this foundation pit support system are as follows: The Chinese pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 张春辉陈一乔何嘉伟龚欢罗庆华许雄关王庆鑫江宏伟郭智云张磊吴贤壮朱德铭谢升昌叶耀金蓝涛陈建荣龙伟辉
Owner GUANGDONG CONSTR ENG GRP
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