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Core soil excavation method for double-side-wall pilot tunnel construction of subway station

A technology for double-sided guide pits and subway stations, which is applied in earth-moving drilling, underground chambers, shaft equipment, etc. Speed ​​and the effect of ensuring construction safety

Active Publication Date: 2019-09-13
林同棪国际工程咨询(中国)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above problems, the present invention provides a core soil excavation method for the construction of double side wall pilot pits in subway stations, which can increase the excavation speed of the core soil, effectively solve the problem of instability of the surrounding rock of the tunnel vault after the core soil contacts, and ensure construction Safety

Method used

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  • Core soil excavation method for double-side-wall pilot tunnel construction of subway station
  • Core soil excavation method for double-side-wall pilot tunnel construction of subway station

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Embodiment 1

[0029] see figure 1 and figure 2 , a method of excavating core soil for construction of double-side wall guide pits in subway stations, comprising the steps of:

[0030] S1: On the basis of the initial advance support of the arch frame 10 of the main tunnel, the excavation of the left and right pilot pits and the completion of the temporary supporting steel frame 9 on both sides of the central pilot pit, the construction preparations before the excavation of the core soil of the central pilot pit are carried out; including : (1) assembling the core soil excavation trolley 4; (2) before dismantling the temporary support steel frame 9, laying out the monitoring and measuring points, and obtaining the initial data of the core soil stress distribution before dismantling; (3) Excavators, loaders and other machinery are evacuated or controlled to avoid dismantling the steel frame by direct destruction, so as to prevent the deformation and instability of the initial support system ...

Embodiment 2

[0040]Project overview: The first phase of Chongqing Rail Transit Line 9 (Gaotanyan-Xingke Avenue) project, Milooliang Station is the tenth station on the whole line. The station is located directly below the Milooliang Overpass at the intersection of Yu'ao Avenue and Jianxin West Road, and is laid perpendicular to the east-west direction of Yu'ao Avenue. On the south side of the small mileage end of the station is the 9-story concrete structure (pile foundation) of Kangjuyuan. The horizontal distance between the structure and the excavation contour of the station is 11m, and the pile bottom is 17m away from the vault of the station. On the south side of the central part of the station, there is a gravity abutment of Yu'ao Avenue and the pile foundation of the overpass bridge. , the bottom of the gravity abutment is 29m away from the vault of the station, and the pile base of the overpass is 25m away from the vault of the station; The starting mileage of the station is YDK11+4...

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Abstract

The invention relates to the technical field of constructional engineering, and discloses a core soil excavation method for a double-side-wall pilot tunnel construction of a subway station. The core soil excavation method comprises the steps that a three-step method is adopted to excavate core soil of a middle pilot tunnel, wherein an upper step and a middle step are synchronously excavated and constructed, the upper step and the middle step are staggered by 5 meters, and the lower step is lagged behind the upper step by about 25 meters and the lower step and the upper step are followed up andexcavated synchronously; vault I-beams are installed to form a ring, system anchor bolts are arranged and advanced construction is performed at a main tunnel part, and concrete is sprayed; and afterthe completion of lower step excavation, inverted arch construction of a main tunnel is performed, second lining waterproofing construction is performed, water-stop belts are installed, and two liningconcrete is poured. Synchronous excavation construction of the upper step and the middle step is performed, the upper step and the middle step are staggered by 5 meters, the lower step is lagged behind the upper step by about 25 meters and the lower step and the upper step are followed up and excavated synchronously, and temporary support and second lining construction are performed in time, so that the excavation speed of the core soil is increased, the problem of instability of surrounding rock of the tunnel vault after core soil contact is effectively solved, and the construction safety isensured.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a core soil excavation method for the construction of a double side wall guide pit of a subway station. Background technique [0002] Since the beginning of the 21st century, with the continuous development of the economy, the continuous improvement of comprehensive national strength and the continuous application of high technology, my country's tunnel and underground projects have achieved unprecedented rapid development. In recent years, in order to meet the growing traffic demand, there are more and more applications of large-section subway station tunnels. There are many methods for excavating subway station tunnels, such as full-face excavation, middle partition (CD), cross middle partition (CRD), and double-side-wall pilot tunnels. Due to the extremely complex deformation mechanism of the surrounding rock of large-section subway station tunnels, the tunne...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21D11/18E21D11/38
CPCE21D9/006E21D11/102E21D11/107E21D11/183E21D11/38
Inventor 史宁强童晨材靳晓光朱文会史作璟成冬钟盈舒小刚丁其乐夏贤冲罗维张中亚
Owner 林同棪国际工程咨询(中国)有限公司