Shield Tunneling Machine – TBM

NHI Group has produced more than 70 sets of different types of shield tunneling machines, meanwhile exported to the Middle East, Southeast Asia etc. Shield tunneling machines have advantages of high efficiency construction, better safety and reliability characteristics, and will be developed to diameter upsizing and adapt big burial depth, high water pressure stratum, etc.

Micro TBM

Micro TBM

Micro TBM is used for city municipal administration underground water supply and drainage pipelines, communication power cable pipe, oil and gas pipeline etc. It is the small size of TBM whose diameter under 3m. Micro TBM produced by NHI Group can adopt different geological conditions, such as soft soil stratum, ultraclay stratum, hard rock stratum etc.

NHI Group is able to make the whole complete machine plan, such as drive type and hinge joint modes. Reasonable structure configuration, operating flexible, reliable performance, energy conservation and environment protection, all makes our machine reach international advanced level. This TBM can save cost in city municipal administration underground water supply and drainage pipelines project.

Slurry Balance TBM

Slurry Balance TBM

Slurry Balance TBM is adaptable to the geological condition of low ground water pressure and high soil permeability coefficient, which is widely applied to the operation of road, rail tunnels crossing the river and sea.

Slurry Balance TBM adopts the advanced technology of air cushion bentonite, which can control the pressure of tunnel face accurately and reduce the impacts of land subsidence. The cutter can be selected flexibly by the geological condition in order to achieve the maximum efficiency. Moreover, it adopts the proprietary technology of changing cutter under normal pressure, which achieves the safe activities of changing cutter with normal pressure underwater.

The core technology of slurry system’s high-pressure scouring can ensure that the cutter cannot be incrusted under conducting soft ground construction. The seal for main drive adopts specific technology. Slurry balance TBM can be operated continually under pressure of 10bar for 10000 hours. This TBM improves the safety performance and reliability for constructions of large, long and deep tunneling.

Earth Pressure Balance TBM

Earth Pressure Balance TBM

Earth Pressure Balance TBM mainly consists of cutter, anterior shield, middle shield, tail shield. It is applied to less underground water, stickiness stratum of small permeate coefficient, grittiness stratum and gravel stratum.

This TBM has many functions, such as excavation advance, synchronize lining, becoming to hole disposable, etc. It will keep soil mass pressure of excavation cabin, maintain relative stability of excavation facial through by accurately controlling the muck displacement of excavation cabin. In order to improve the plasticity, liquidity and water tightness of soil mass, and the excavation efficiency of cutter, it reduces cutter abrasion through by inject bubble, polymer and bentonite from cutter to excavation face. Different cutter structure and cutter tool configuration makes it suitable for wide and complicated geological condition.

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