Shield tunnel internal supporting trolley system under small spacing, shallow soil covering and small radius conditions

Abstract

The invention discloses a shield tunnel internal supporting trolley system under small spacing, shallow soil covering and small radius conditions. The shield tunnel internal supporting trolley systemcomprises a trolley track, a muck vehicle track, a trolley and a muck vehicle, wherein the trolley track and the muck vehicle track are arranged at the bottom of a tunnel, the trolley is matched withthe trolley track, and the muck vehicle is matched with the muck vehicle track; the trolley track adopts an original track on which a shield trolley walks; and the trolley comprises a frame, a walkingmechanism and a supporting mechanism, the upper portion of the frame can contain a ventilation pipeline, the lower portion of the frame stretches across the muck vehicle and does not interfere with the muck vehicle, the supporting mechanism comprises arc-shaped plate supports, sliding hinge pieces and telescopic jacking pieces, the arc-shaped plate supports are distributed on the upper portion and the two sides of the tunnel, gaps exist between the adjacent arc-shaped plate supports, the arc-shaped plate supports are slidably hinged to the frame through the sliding hinge parts, the arc-shapedplate supports are telescopically connected with the frame through the telescopic jacking pieces, and when the telescopic jacking pieces drive the arc-shaped plate supports to be ejected out and retracted back, the sliding hinge parts play a role in guiding and limiting. According to the system, duct pieces are prevented from being damaged, advancing spaces of the ventilation pipeline and muck isreserved, and the influence on the first-departure line tunnel is reduced to the minimum.

Description

technical field [0001] The invention belongs to the field of tunnel construction, and in particular relates to an internal support trolley system of a shield tunnel under the condition of small spacing, shallow covering soil and small radius. Background technique [0002] The shield tunneling method has become the mainstream method of tunnel construction due to its high degree of mechanization, safe and efficient excavation, and strong adaptability to most geological terrains. However, with the continuous deepening of urban development in recent years, more requirements have been put forward for the construction of urban rail transit. Constrained by many conditions such as urban development planning, existing building foundations, natural gas and water supply pipelines, etc., urban subway tunnels are gradually developing in the direction of shallow covering soil, small spacing, and small radius. Except for a few cities, most of the urban rail transit is located in soft soil...

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Problems solved by technology

[0004] The results of literature research show that there are relatively few researches and developments on supporting trolley devices in tunnels, and all existing devices have obvious defects, for example, Chinese invention patent (publication number CN104314588A) and Chinese utility model patent (publication number CN209040834U) A proposed inner circular support system for shield tunnels adopts the method of cross support and prestressing respectively to reinforce the circular ring support to achieve the inner support effect. Move forward without leaving space for the muck truck to travel; another example is the Chinese invention patent (publication number CN108590679) which proposes a kind of inner support stress trolley, which uses a mechanical folding method to realize the inner circle support and leaves enough space for the dregs The earth truck was unearthed, but the walking of this trolley requires the cooperation of pre-installed rails, support formwork and bottom sleepers, and there is no space for ventilation ducts. The cost of the entire trolley support device is high and the force on the inner circle support is insufficient Uniform, mechanical round braces are prone to damage

[0005] In view of the above defects in the existing support systems and methods in shield tunnels, it is difficult to take into account the actual needs of the continuous construction of the first line tunnel and the excavation and movement of the subsequent line tunnel.

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