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Natural pilot tunnel roof ripping method

A natural and positive hole technology, applied in the shaft lining, tunnel lining, underground chamber, etc., can solve the problems of lowering the stability of the support, losing the working platform, and increasing safety risks, so as to reduce artificial over-excavation and support the beam position Smooth, ensure the progress of the effect

Active Publication Date: 2018-09-14
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction technology that uses portal beams as the support points of the main tunnel arch is commonly used in tunnel roofing. Using this construction technology is likely to cause the local triangular overexcavation zone above the portal to be too large due to human factors, and the main tunnel arch connected to the portal will be too large. The frame is linear, which is not conducive to the stability of the structure
[0003] For example, the patent CN201520661628.6 discloses a technical solution for supporting a steel frame at the intersection of a tunnel. This method is restricted by the condition of the height difference between the roof of the auxiliary tunnel and the roof of the main tunnel. The height difference must be less than 2.2m;
If the steel frame support is also adjusted to a relative height difference of about 2.2m, the "herringbone" opening is too large, and the construction difficulty of the outriggers will be greatly increased, and the adjustment of the relative height difference will greatly reduce the stability of the support
The roof support also uses the inward inclination of the lower steps of the main hole to form inset outriggers, but the loss of the natural working platform during the roof will greatly increase the difficulty of the roof

Method used

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] A method for raising a roof through a natural guide tunnel, comprising the following steps:

[0036] S1. The welded support steel plate of the last arch frame 3 in the horizontal hole is used as the reserved connecting plate, the height of the reserved connecting plate 4 is 10cm, arranged perpendicular to the horizontal line, and the layout spacing is 0.8m;

[0037] S2. Along the direction of the small mileage of the tunnel, one side of the arch frame i...

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Abstract

The invention relates to the field of tunnel roof ripping, in particular to a natural pilot tunnel roof ripping method. In pilot tunnel roof ripping construction, a gantry is completely canceled, anda last arch truss of a transverse tunnel is reinforced to serve as a supporting point of an arch truss at a main tunnel intersection section. Compared with a gantry pilot tunnel method for tunnel construction, the method has advantages that a supporting crossbeam part is smooth, local manual overbreak is reduced, and the schedule, quality and safety in tunnel roof ripping construction are guaranteed.

Description

technical field [0001] The invention relates to the field of tunnel roofing construction, and more specifically, relates to a natural pilot tunnel roofing method. Background technique [0002] With the rapid development of my country's railway construction, long tunnels continue to emerge. In order to ensure the construction progress, appropriate auxiliary tunnels will be set up to increase the construction work surface, speed up the construction progress and improve the construction conditions. In the construction of the auxiliary tunnel entering the main tunnel, due to the complex structure of the intersection section and the frequent structural stress transformation, it is very important to master the roof construction technology in tunnel construction. The construction technology that uses portal beams as the support points of the main tunnel arch is commonly used in tunnel roofing. Using this construction technology is likely to cause the local triangular overexcavatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18E21D11/10
CPCE21D11/10E21D11/18
Inventor 李宏晋李佐付国宏张振国
Owner CHINA RAILWAY 12TH BUREAU GRP
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