Novel tunnel initial support structure and construction method

Abstract

The invention relates to a novel tunnel initial support structure. The novel tunnel initial support structure includes a support foundation, a connecting type steel column, a steel arch, a steel plate, micro-expansion fine stone concrete and quick-setting fine stone concrete; the support foundation is cast-in-place reinforced concrete structure, the connecting type steel column is located on the support foundation, lateral anchoring ribs are arranged on the adjacent sides, close to the contour line of a tunnel, of the support foundation and the support foundation is anchored in the outer stratum of the tunnel, inverted arch reserved ribs are reserved on the outer side surface of the support foundation, and the support foundation is provided with grooves for placing water collecting pipes;the steel arch and the connecting type steel column are connected by bolts or welding; the steel plate is a light and thin straight-surface steel plate or corrugated steel plate, and the steel plate and the steel arch are connected by welding and units of the steel plate are connected by welding. The novel tunnel initial support structure has beneficial effects that compared with a traditional initial support structure, the structure of the novel tunnel initial support structure is relatively simple, the implementability is better, the micro-expansion fine stone concrete filled tunnel excavation surface plays a certain backpressure role, and stability of the tunnel excavation surface can be ensured.

Description

technical field [0001] The invention relates to a tunnel initial support structure and a construction method, in particular to a novel tunnel initial support structure and a construction method. Background technique [0002] At present, the traditional primary support structure of tunnels is a combined force-bearing structure composed of anchor rods, steel mesh, steel frames and shotcrete. Although this type of primary support structure is widely used, it also has certain problems, such as The huge dust pollution inside the tunnel caused by rod drilling and shotcrete seriously damaged the cardiopulmonary function of workers, the excessive deformation caused by the release of initial stress around the tunnel, and the messy and irregular drainage inside the tunnel. To a certain extent, it also restricts the technical development and progress of the primary support structure of tunnels in my country. Therefore, the traditional primary support structure needs innovation and transf...

AI Technical Summary

Problems solved by technology

[0002] At present, the traditional primary support structure of tunnels is a combined force-bearing structure composed of anchor rods, steel mesh, steel frames and shotcrete. Although this type of primary support structure is widely used, it also has certain problems, such as The huge dust pollution inside the tunnel caused by rod drilling and shotcrete seriously damaged the cardiopulmonary function of workers, the excessive deformation caused by the release of initial stress around the tunnel, and the messy and irregular drainage inside the tunnel. To a certain extent, it also restricts the technical development and progress of the primary support structure of tunnels in my country. Therefore, the traditional primary support structure needs innovation and transformation to meet the construction needs of socialist modernization in the new era.

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