Separated type tunnel arch-replacement supporting structure and construction method thereof

Abstract

The invention relates to a separated type tunnel arch-replacement supporting structure and a construction method thereof. The supporting structure comprises a supporting structure body. A cavity grouting hole, an original steel frame, a new steel frame, a grouting small guide pipe, dwarf side walls, a temporary inverted arch structure, a reinforcing steel bar net, an inverted arch and a secondarylining structure are arranged on the supporting structure body. The temporary inverted arch structure is composed of an I-type steel frame and lock pin steel pipes and is erected in the middle heightposition of a tunnel and reinforced through a wood wedge. The inverted arch is located on the lower side of the bottom face of the tunnel. The original steel frame and the new steel frame are erectedin the tunnel. The grouting small guide pipe is arranged in the cross section of the original steel frame. The dwarf side walls are located on the two sides in the tunnel. The grouting steel floral pipes are arranged the arch legs and arc waist of the tunnel and the corners of the dwarf walls. The reinforcing steel bar net is arranged between the steel frames. The secondary lining structure is located on the inner side of the reinforcing steel bar net. Compared with existing arch-replacement construction, the problems of time and labor waste, safety and quality are solved, and the remarkable economic benefits are obtained.

Description

technical field [0001] The invention relates to a supporting structure of a split tunnel, in particular to a split tunnel arch changing supporting structure and a construction method thereof. Background technique [0002] The center of the national development strategy is shifting from the eastern coastal areas to the central and western inland areas, which requires vigorous development of transportation. However, the central and western parts of my country are mountainous, and tunnels need to be built to cross the mountainous areas in the process of building roads or railways. The safety problems of the tunnel mainly include cracks and deformations during the construction period. If they are not controlled and repaired, it will have a major impact on the safety of the entire structure of the tunnel. Therefore, it is necessary to replace the arch at the deformation of the initial support structure of the tunnel. [0003] The traditional arch replacement construction is gener...

AI Technical Summary

Problems solved by technology

[0003] The traditional arch replacement construction is generally a full hall bracket erected during the arch replacement process. This construction mode requires a lot of manpower and material resources, and is prone to accidents during the erection process, so it is no longer suitable for current construction requirements; the current mainstream The tunnel arch replacement construction adopts grouting support structure, but the layout of grouting pipes, grouting pressure, and temporary support settings will change greatly due to engineering geological conditions, tunnel forms, etc., especially the supporting structure.

For example: the arch replacement construction method mentioned in document CN201210220525.7 requires a large number of temporary supports to be installed and removed during the entire arch change period. Although the safe construction is guaranteed, the construction period cannot be guaranteed; document CN201720057979. The arch replacement construction structure mentioned in 5 needs to set the foundation beam at the center of the steel arch frame, and use the foundation beam as the base point to set vertical, oblique and transverse supports inside the tunnel to ensure the stability of the tunnel structure during the arch replacement period. There is the same problem as above, that is, the erection of the support structure is time-consuming and labor-intensive

Images