3D printed steel fiber reinforced concrete tunnel preliminary support grating arch frame and construction method thereof

Abstract

The invention provides a 3D printed steel fiber reinforced concrete tunnel preliminary support grating arch frame and a construction method thereof. The arch frame is divided into a plurality of unitjoints in the extending direction of the arch frame. Each unit joint is formed in an integral printed manner through 3D printing equipment. Each unit joint comprises a 3D printed outer support plate,a 3D printed reinforcing support, a 3D printed inner side support and 3D printed bolt connecting plates. The 3D printed bolt connecting plates are arranged at the head end and the tail end of each unit joint. Transverse plates of two L-shaped plates on the same side of two adjacent unit joints are mutually connected to form the overall arch frame. According to the arch frame, the steel fiber reinforced concrete outer support plates are large in stress area, can bear surrounding rock pressure more effectively than grating steel frame main reinforcement, and can effectively ensure stress performance of preliminary support components. The arch frame is integrally manufactured by adopting the printing form of a 3D printer, the weight of the arch frame is low compared with grating steel arch frame preliminary support components, hoisting and installing are facilitated, and the hoisting cost can be reduced effectively. Meanwhile, the situation that traditionally, grating steel frame is welded and machined manually on preliminary support site is avoided, the labor cost is reduced, and the construction period is shortened.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a 3D printed steel fiber concrete tunnel initial support grid arch frame and a construction method thereof which can be used in underground excavation tunnel construction, and is applicable to various underground excavation tunnels requiring initial support construction. Background technique [0002] With the rapid development of the economy and the continuous improvement of the level of urbanization, the development of underground space has become one of the main directions of urban space development, and there are more and more underground structures. Underground tunnels are the main components of urban underground space development. , occupies an important position. At present, most of the initial support of underground excavation tunnels are constructed with grid steel frames, and there are the following problems: [0003] 1. Poor construction accuracy of the gri...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a 3D printed steel fiber reinforced concrete tunnel primary support grid arch frame and its construction method. The technical problems of difficult construction and high cost for workers, as well as the technical problems that the existing concrete prefabricated arch frame can only be prefabricated with slabs, self-heavy, hoisting, transportation and installation are very difficult

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