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

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...

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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

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