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Interface primary support system for auxiliary transverse channel of mined metro station and construction method

A technology of subway stations and construction methods, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of unguaranteed construction quality of three-dimensional steel frames, high processing accuracy, and inability to prevent temporary exposure of suspended surfaces, etc., to achieve improved processing The effect of accuracy requirements and processing difficulty, shortening construction period, and reducing operation risk

Pending Publication Date: 2020-06-12
KUNMING SURVEY DESIGN & RES INST OF CREEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current common practice is to excavate the main steel frame within the scope of the entrance by one-time blasting to the outer contour of the main side wall and erect the three-dimensional arched steel frame immediately. The size parameters of each three-dimensional arched steel frame are different. In order to ensure the limit, the processing of the steel frame requires extremely high machining accuracy, so the quality of the three-dimensional steel frame at the interface cannot be guaranteed. Moreover, even if the steel frame is immediately erected on site and sprayed to seal the initial support, the problem of temporary exposure of the suspended surface cannot be eliminated. Holes The construction of the door interface is still the working condition of "opening the hole first and then supporting it", which is extremely risky; if it is in a poor stratum such as weak surrounding rock and fracture zone, the station tunnel and ground buildings will be directly threatened during the period when the suspended surface is exposed. The collapse of the tribe, the consequences are unimaginable

Method used

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  • Interface primary support system for auxiliary transverse channel of mined metro station and construction method
  • Interface primary support system for auxiliary transverse channel of mined metro station and construction method
  • Interface primary support system for auxiliary transverse channel of mined metro station and construction method

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Embodiment 1

[0043] This embodiment further elaborates the present invention in combination with the construction method of the underground excavation station of Qingdao Line 4, the on-site implementation of the portal interface and the patent drawings.

[0044] Such as figure 1 As shown, the primary support system of the interface of the submerged cross passage of the submerged subway station in this embodiment includes the primary support system of the station tunnel pick-up plate, the primary support 2 of the auxiliary tunnel and the additional portal system inside the interface.

[0045] The additional portal support system includes the additional portal steel frame 3 and the primary support sprayed concrete, the vertical support steel frame 10 between the additional portal and the initial support of the pick-up plate, the advance support pipe shed 6, and the expansion shell anchor of the initial support of the pick-up plate pole 7.

[0046] The station tunnel should select the approp...

Embodiment 2

[0057] Such as Figure 4 As shown, the construction method of the primary support system in this embodiment, the difference between this embodiment and Embodiment 1 is only in the excavation stage of variable section of the station tunnel at the interface of step (1): the station tunnel is excavated according to the existing method ,Such as figure 2 As shown in the figure, assuming that the station tunnel’s standard cross-section initial support outline 11 steel frame to the outer contour of the interface portal ≥ 1.5m when the station tunnel pick-up plate initial support expansion excavation range, according to the interface portal span is higher than the straight point 8 to start the expansion excavation The outline of the initial support 1 of the slab-type station tunnel adjusts the arc of the station arch on the side of the gate to the initial straight wall 4 of the station tunnel, and the additional gate can invade the range of the secondary lining structure 5 of the sub...

Embodiment 3

[0059] In the construction method of the initial support system of this embodiment, in step (1), if the surrounding rock is poor, the outline of the initial support 1 of the pick-up type station tunnel is not applied, and the straight point 8 of the initial support of the station tunnel is taken. Arc-shaped excavation is carried out along the outline of the original branch of the station tunnel to ensure the stress on the arch of the tunnel and control the settlement. The rest are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to an interface primary support system for an auxiliary transverse channel of a mined metro station and a construction method. The primary support system comprises a bridging piece type station tunnel primary support, an auxiliary tunnel primary support and an additional tunnel primary support system at the inner side of an interface. The interface primary support system canaccomplish stress conversion at a tunnel before the interface channel is holed, and also greatly improves steel frame processing precision needs and processing difficulty, so that the interface tunnelaccomplishes cut-off and break-away excavation of a station arch part side wall steel frame under protection of effective support, the station arch part suspended surface exposure problem caused by holing is solved, and construction risk is reduced.

Description

technical field [0001] The invention relates to an interface initial support system, in particular to an interface initial support system for an auxiliary cross channel of a submerged subway station, and also relates to a construction method thereof, which belongs to the field of design and construction of subway tunnels. Background technique [0002] Underground excavation method is often used to build subway stations in existing rock formations. The characteristics of single-arch, large-span and large-section tunnels in underground excavation stations often require opening holes in the arc-shaped side walls of station top arches to form interfaces for auxiliary passages. When the opening is opened, the station arch above the portal hangs in the air and is easy to collapse. With the increase of the span and height of the auxiliary portal, the opening of the suspended surface prevents the load from the upper station arch from being transmitted downward, and the station arch i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/14E21D11/10E21D11/18E21D20/00
CPCE21D11/105E21D11/14E21D11/18E21D20/00
Inventor 孟小伟夏靖张椿民杨陈相赵平方洪波孙庆洁陈歆高骏
Owner KUNMING SURVEY DESIGN & RES INST OF CREEC
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