Construction method of TBM-EPB double-mode shield in composite stratum

Abstract

The invention relates to the field of shielding construction and particularly relates to a construction method of a TBM-EPB double-mode shield in a composite stratum. The construction method sequentially comprises the following steps of 1 geological exploration, 2 shield field installation and debugging, 3 shield starting and tunneling, 4 shield tunneling mode switching, 5 normal tunneling and 6 sequential repeating of the steps 4 and 5 till construction is completed and the shield is lifted out. An inventor of the construction method sets the shield tunneling mode switching in the hard rock stratum close to an interface through long-range research and summarizing. Due to the fact that the hard rock stratum has higher hardness and strength and good self stability, namely a tunneling driving face does not need supporting under pressure and the collapse problem does not occur, the tunneling driving face is not needed to be reinforced during shield tunneling mode switching, input manpower and material resources are directly decreased on the premise that construction safety is ensured, and a construction period is further shortened.

Description

technical field [0001] The invention relates to the field of shield construction, in particular to a construction method of a TBM-EPB dual-mode shield in a composite stratum. Background technique [0002] Shield tunneling is a large-scale mechanical equipment used in tunnel engineering construction. It integrates rock breaking, slag extraction, lining, and support. It has the advantages of high automation, fast speed, safety and efficiency. In recent years, in tunnel projects has been widely used. [0003] In tunnel construction, it usually involves the construction of strata with different geological conditions. As far as shield construction is concerned, it needs to be divided into hard rock stratum and soft rock stratum according to the hardness of the stratum, and shield tunneling is also divided according to the hardness of the stratum. Correspondingly, it is divided into two tunneling modes, one is the TMB tunneling mode suitable for hard rock formations, and the othe...

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Problems solved by technology

[0006] However, there are still deficiencies in tunnel construction using the TBM-EPB dual-mode shield. In actual engineering, the inventor found that when the TBM-EPB dual-mode shield is used for mode conversion, it needs to be disassembled and transported during the conversion. The machine, the central swivel joint, the mud scraper in the soil pressure chamber and other components, so that during the conversion period, the excavation face cannot be supported under pressure, and this is the interface between soft and hard strata, and its geological conditions are complex. The stability is low, and it is very prone to collapse, which makes it impossible to switch the excavation mode, and even leads to safety accidents in severe cases. Therefore, in the current construction method, the tunnel face needs to be reinforced before the excavation mode is switched. In this way, It also prolongs the construction period and increases the construction cost.

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