Annular steel structure supporting construction method with open type TBM (tunnel boring machine)

Abstract

An open state is formed behind a shield of an open type TBM (tunnel boring machine), so that bolting and shotcreting with wire mesh and the like can be realized, when unfavorable geological conditions such as crushed zones are encountered, broken surrounding rock collapses and falls, which not only threatens the safety of operating personnel and equipment, but also greatly lowers the construction efficiency. The invention discloses an annular steel structure supporting construction method with the open type TBM. The supporting TBM is provided with a shield which has an annular steel structure installation space. When the unfavorable geological conditions are encountered, the annular steel structure can be fast erected in an assembly line mode under the protection of the shield, the shield is replaced with the annular steel structure for supporting the surrounding rock as the TBM tunnels; under the protection of the annular steel structure, an annular steel grating and a steel mesh hollow structure are used for carrying out the bolting and shotcreting supporting and the like, the previous extensive construction is changed to controllable standardized operation, the original open type unsafe environment is changed to a closed protected operation zone; the construction method disclosed by the invention is different from the passive supporting which is carried out after the surrounding rock collapses and falls; the annular steel structure actively close off the broken surrounding rock, then the surrounding rock becomes a part of the supporting structure, the work amount for backfilling concrete and removing slag is greatly reduced, and thus the method is more efficient and safer, the cost is reduced and the operation is easy to realize.

Description

technical field [0001] The invention relates to a tunnel excavation and support engineering full-face hard rock tunnel boring machine (TBM) construction technology, in particular to an open TBM construction method facing adverse geological conditions such as broken surrounding rock. Background technique [0002] The biggest advantage of the open TBM is because of its "open" feature. In the area behind its short shield, the surrounding rock is in an empty state, which makes support such as anchoring, mesh spraying, etc. easy to achieve. But it is precisely because of this feature that when facing adverse geological conditions such as broken surrounding rock, the broken surrounding rock in the air condition will collapse and fall, which not only poses a great safety threat to the personnel and equipment working here, but also Under such circumstances, the efficiency of the support operation is extremely low, and the effect is not good; in addition, all the broken rocks that ha...

AI Technical Summary

Problems solved by technology

In fact, it is unsafe, labor-intensive and time-consuming to carry out this process in the cave, and due to the harsh working environment, the whole process bores the construction personnel, so it is often dealt with. Not only is it difficult to guarantee the welding quality, but the quantity is often insufficient. There is a problem with the quality, and the overall bearing capacity of the arch frame is reduced

Therefore, twisting and deformation, wire invasion, etc. often occur, making it difficult for the boots to pass through

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