Method for primary support with corrugated steel plate and concrete combined structure taking place of steel grating

Abstract

The invention discloses a method for primary support with a corrugated steel plate and concrete combined structure taking the place of a steel grating. The corrugated steel plate and concrete combined structure is formed by assembling and connecting an upper supporting corrugated plate, a side wall corrugated plate and an inverted arch corrugated plate into a ring; two arch feet of an upper step of a cavern are fixedly provided with two pieces of H-section steel, and the upper end of the upper supporting corrugated plate and the upper end of the side wall corrugated plate are supported and fixed through the H-section steel; two arch feet of a lower step are fixedly provided with two pieces of channel steel, the lower end of the side wall corrugated plate is supported and fixed through the channel steel, and an inverted arch lap joint is reserved on the lower end of the side wall corrugated plate; the upper supporting corrugated plate, the side wall corrugated plate and the inverted arch corrugated plate are sequentially connected through flanges in the longitudinal direction; concrete is poured among the upper supporting corrugated plate, the side wall corrugated plate, the inverted arch corrugated plate and surrounding rock. The structure is manufactured through the structure mixing a corrugated steel plate and the concrete, stress is balanced through the structure and the surrounding rock, strength of the primary support is guaranteed, and the structure has the advantages that construction is facilitated, the period is short, efficiency is high, stability is high, and cost is low.

Description

technical field [0001] The invention belongs to the field of primary support for tunnels, in particular to a construction method for primary support of a corrugated steel plate and concrete composite structure. Background technique [0002] At present, the structural types used for the initial support of tunnels are basically single section steel (mainly I-beam) or steel grids, with a single structure. When using the step method to excavate and carry out the initial support of the tunnel, if a small section is excavated and steel grids are used as the initial support, the concrete cannot bear the load immediately after the shotcrete, and must go through a maintenance process, so the construction progress is affected. Certain restrictions. In addition, a large amount of steel material is consumed, and the thickness of the initial lining is also greater than that of the corrugated steel plate after replacing it. It is often necessary to excavate a larger section, which is not...

AI Technical Summary

Problems solved by technology

[0002] At present, the structural type used for the initial support of tunnels is basically a single section steel (mainly I-beam) or steel grid, with a single structure

When using the step method to excavate and carry out the initial support of the tunnel, if a small section is excavated and steel grids are used as the initial support, the concrete cannot bear the load immediately after the shotcrete, and must go through a maintenance process, so the construction progress is affected. certain restrictions

In addition, a large amount of steel material is consumed, and the thickness of the initial lining is also greater than that of the corrugated steel plate after replacing it. It is often necessary to excavate a larger section, which is not only time-consuming, but also increases the cost of construction.

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