Internal support trolley system of shield tunnel under the condition of small spacing, shallow covering soil and small radius

Abstract

The invention discloses an internal supporting trolley system of a shield tunnel under the condition of small spacing, shallow covering soil and small radius. The track of the trolley adopts the original track of the shield trolley; the trolley includes a frame, a running mechanism and a supporting mechanism. The upper part of the frame can accommodate the ventilation duct, and the lower part spans the muck truck without interfering with it. The support mechanism includes arc braces, sliding hinges and telescopic top pieces. The arc braces are distributed on the upper part and both sides of the tunnel with gaps between them. The arc braces are slidably hinged to the vehicle frame through sliding hinges. 1. Through the telescopic connection between the telescopic top piece and the vehicle frame, when the telescopic top piece drives the arc-shaped plank to push out and retract, the sliding hinge plays the role of guiding and limiting. This system avoids segment damage, leaves space for ventilation ducts and muck to travel, and minimizes the impact on the starting line tunnel.

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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