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Inverted arch prefabricated assembly structure suitable for loess highway tunnel and construction method

A road tunnel, prefabricated assembly technology, applied in the direction of infrastructure engineering, tunnel, tunnel lining, etc., can solve the problems of poor reinforcement effect and inconvenient construction of prestressed tendons on site, so as to reduce uneven settlement and reduce arch The effect of foot sinking and fast and reliable connection

Pending Publication Date: 2022-04-12
甘肃二车高等级公路项目管理有限公司 +2
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Problems solved by technology

[0007] The above-mentioned existing technology mainly relies on the prestressed tendons pierced at the top and bottom of the inverted arch to increase the structural strength of the inverted arch. Only the inverted arch is strengthened, and the arch foot is made by casting in situ or only prefabricated arch foot However, the cross-section of the arch foot is not optimized, and the reinforcement effect is not good; in addition, the prestressed tendons at the bottom of the prefabricated inverted arch are inconvenient to be stretched on site

Method used

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  • Inverted arch prefabricated assembly structure suitable for loess highway tunnel and construction method
  • Inverted arch prefabricated assembly structure suitable for loess highway tunnel and construction method
  • Inverted arch prefabricated assembly structure suitable for loess highway tunnel and construction method

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0041] Glossary

[0042] (1) Loess: A kind of light yellow or brownish-yellow soil, the particle composition is mainly silt particle size (content> 50%), the material particle size is uniform, with pores, no bedding, loose, and vertical joints developed. Quaternary continental sediments rich in calcium carbonate, sometimes containing sulfate or chloride salts, with pores visible to the naked eye.

[0043] (2) Inverted arch: an inverted arched structure set at the bottom of the tunnel to improve the stress conditions of the upper support structure, which is one of the main components ...

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Abstract

The invention relates to an inverted arch prefabricated assembly structure suitable for a loess highway tunnel and a construction method.The inverted arch prefabricated assembly structure comprises prefabricated inverted arch units, prestressed tendons are arranged at the tops of the prefabricated inverted arch units in a penetrating mode, and embedded steel plates used for being connected with grouting steel pipe piles are arranged at the bottoms of the prefabricated inverted arch units; each prefabricated inverted arch unit comprises a plurality of prefabricated blocks which are spliced and connected, and the outer ends of the two prefabricated blocks on the outermost side extend to form arch foot parts; the construction method comprises the steps of excavating the loess tunnel, carrying out splicing construction on the inverted arch prefabricated splicing structure, installing the prestressed tendons, tensioning and fixing the prestressed tendons, pouring the inverted arch filling layer and laying the plastic concrete buffer layer. Compared with the prior art, the method has the advantages that differential settlement of the arch springing relative to the middle of the inverted arch can be effectively reduced, and the like.

Description

technical field [0001] The invention belongs to the technical field of loess road tunnels, and relates to a prefabricated inverted arch structure, in particular to an inverted arch prefabricated assembly structure suitable for loess road tunnels and a construction method. Background technique [0002] When tunnels pass through weak surrounding rock areas such as loess, subsidence of arch feet and inverted arch bottom drums often occur, resulting in longitudinal cracks and even misalignment of the road surface, which seriously endangers the driving safety of the tunnel during operation. In view of the problem of longitudinal cracking of pavement caused by uneven settlement of tunnels, the existing reinforcement technology is "using prestressed prefabricated inverted arch structures". [0003] Patent application CN110617081A discloses an assembled prefabricated inverted arch structure of a road tunnel. The flange plate is welded on the end of the connecting member, the stiffen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/08E21D11/10E21D11/38E02D5/38E01C3/00
Inventor 刘宽富朱小明金明亮李国虎杜源马逸非杜诚诚孙州郭小青
Owner 甘肃二车高等级公路项目管理有限公司
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