Tunnel excavation support structure for stratum with soft upper part and hard lower part and tunnel excavation construction method

A technology for tunnel excavation and support structures, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of high safety pressure and low construction efficiency, achieve stable force, high construction efficiency, and reduce arch disturbance Effect

Pending Publication Date: 2019-04-05
RAILWAY NO 10 ENG GRP CO LTD
View PDF11 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the support structure of tunnels in the upper soft and lower hard strata mostly adopts the method of ellipse forming ring primary support and partial excavation support, which has low construction efficiency and high safety pressure.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Tunnel excavation support structure for stratum with soft upper part and hard lower part and tunnel excavation construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing by non-limiting embodiment:

[0020] As shown in the accompanying drawings, an excavation and support structure for tunnels in upper soft and lower hard strata includes an arch cover and hard rock 5 in the lower layer of the tunnel. The arch cover is composed of a plurality of arched steel frames 2, several small conduits 6 and shotcrete layers. The arched steel frames 2 are arranged in sequence along the tunnel direction and connected together. The arches of the arched steel frames 2 After the angle is enlarged, it is fixed on the hard rock 5 in the lower layer of the tunnel. The small conduit 6 is set at the vault and driven into the upper soft stratum 1 of the tunnel, and its tail is welded with the arched steel frame 2. The concrete layer wraps the arched steel frame 2 inside and forms a large arch foot 4 at the arch foot.

[0021] In order to improve the stability of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a tunnel excavation support structure for a stratum with a soft upper part and a hard lower part and a tunnel excavation construction method, and belongs to the technical fieldof tunnel construction. The tunnel excavation support structure for the stratum with the soft upper part and the hard lower part is characterized by comprising an arch cover and hard rock at the lower layer of a tunnel, the arch cover is composed of a plurality of arched steel frames, a plurality of small guide pipes and a sprayed concrete layer, the arched steel frames are sequentially arrangedand connected together in the direction of the tunnel and fixed to the hard rock at the lower layer of the tunnel after the arch angle is increased, the small guide pipes are arranged at the arch toppart and driven into the soft stratum of the upper portion of the tunnel, the tails of the small guide pipes are welded to the arched steel frames, the sprayed concrete layer wraps the arched steel frames, and large arch feet are formed at arch foot parts. According to the tunnel excavation support structure, the strength of the arch cover is high, the arch feet of the arch cover are supported onthe stable bed rock on both sides, the load of the arch cover can be transmitted to the hard bed rock at the lower layer, the structure and a mountain can jointly resist the load, the construction safety can be ensured, and the construction efficiency can be improved.

Description

technical field [0001] The invention relates to a tunnel excavation support structure, in particular to a tunnel excavation support structure applied to upper soft and lower hard strata, and belongs to the technical field of tunnel construction. The present invention also relates to a tunnel excavation construction method using the above-mentioned tunnel excavation support structure. Background technique [0002] The initial support arch cover method is a new subway station construction technology, which is suitable for upper soft and lower hard ground. It is the development of cover excavation technology. Compared with the second lining arch cover method, the arch angle beam is cancelled, and the construction process and material consumption are reduced. . However, the support structure of tunnels in the upper soft and lower hard strata mostly adopts the method of ellipse forming ring primary support and partial excavation support, which has low construction efficiency and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18E21D11/15E21D20/00
CPCE21D11/152E21D11/18E21D20/00
Inventor 常春章华敬华杨保全张海霞曾来仕杨成达赵坤殷倩倩
Owner RAILWAY NO 10 ENG GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap