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Upper-soft lower-hard ground subway station foundation pit support system and construction method thereof

A support technology for subway stations and foundation pits, which is applied in infrastructure engineering, excavation, construction, etc., and can solve problems such as complex geological conditions, difficult construction, and large excavation diameters

Active Publication Date: 2016-12-07
CHINA RAILWAY 20 BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the excavated piles to be constructed is Φ2m~Φ3m and the depth of the pile holes is 23m~25m. Due to the complex geological conditions in the construction area, the presence of quicksand layers, and the large excavation diameter, the actual construction is difficult

Method used

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  • Upper-soft lower-hard ground subway station foundation pit support system and construction method thereof
  • Upper-soft lower-hard ground subway station foundation pit support system and construction method thereof
  • Upper-soft lower-hard ground subway station foundation pit support system and construction method thereof

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Embodiment Construction

[0069] Such as figure 1 The support system for the foundation pit of a subway station in upper soft and lower hard strata, including the enclosure structure arranged outside the foundation pit 16-5 of the constructed subway station and the intermediate support arranged in the middle of the inner side of the foundation pit 16-5 of the subway station structure;

[0070] The intermediate support structure includes a plurality of excavated piles, which are arranged from front to back along the longitudinal length direction of the foundation pit 16-5 of the subway station, and the plurality of excavated piles are all vertical. layout; the hole-digging piles are steel pipe concrete piles, and the diameter of the steel pipe concrete piles is Φ550mm~Φ650mm; figure 2 , the steel pipe concrete pile includes a steel pipe support column 1 located in the constructed subway station, a middle node structure arranged in the middle of the steel pipe support column 1 and a lower node structur...

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Abstract

The invention discloses an upper-soft lower-hard ground subway station foundation pit support system and a construction method thereof. The support system comprises a building envelope distributed on the outer side of a constructed subway station foundation pit and a middle supporting structure distributed in the middle of the inner side of the subway station foundation pit. The middle supporting structure comprises a plurality of digging piles distributed from front to back. The digging piles are steel pipe concrete piles, and each steel pipe concrete pile comprises a steel pipe supporting column, a middle joint structure and a lower joint structure. The construction method comprises the steps that the building envelope and the middle supporting structure are constructed correspondingly; and when the middle supporting structure is constructed, the multiple digging piles in the middle supporting structure are constructed from front to back correspondingly, and when the drilled piles are constructed, the process comprises the following steps of firstly, pile hole excavation, secondly, steel pipe column hoisting and thirdly, concrete pouring. According to the upper-soft lower-hard ground subway station foundation pit support system and the construction method, design is reasonable, construction is easy and convenient, and the use effect is good; the upper-soft lower-hard ground subway station foundation pit can be effectively supported; and stability in the foundation fit excavation process and stability generated after foundation fit excavation is completed are ensured.

Description

technical field [0001] The invention belongs to the technical field of subway station construction, and in particular relates to a foundation pit support system and a construction method for a subway station on upper soft and lower hard strata. Background technique [0002] The subway station is an important building in the urban rail transit network. It is a place for passengers to take off, transfer and wait. The cover-excavation method is a new engineering construction method adopted when the underground engineering needs to cross obstacles such as roads and buildings. Specifically, after the ground is excavated to a certain depth, the top is closed, and the rest of the substructure is in the closed area. Construction under the roof. The main structure can be done forward or reversed. When using the cover-excavation method to construct a subway station in upper hard and lower soft ground, the construction is more difficult. For example, when constructing the Wusi Squar...

Claims

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Application Information

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IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 吴应明任少强郭朋超朱红桃张照龙
Owner CHINA RAILWAY 20 BUREAU GRP
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