Novel shallow-buried tunnel support structure applicable to urban sensitive areas and construction method of novel shallow-buried tunnel support structure applicable to urban sensitive areas

Abstract

The invention belongs to the technical field of tunnel and underground engineering and particularly relates to a novel shallow-buried tunnel support structure applicable to urban sensitive areas and a construction method of the novel shallow-buried tunnel support structure applicable to the urban sensitive areas.The novel shallow-buried tunnel support structure comprises an advanced support, a primary support and a prefabricated tunnel lining which are sequentially arranged from outside to inside along the radial direction of a tunnel, wherein the primary support comprises a plurality of concrete-filled steel tube arches which are arranged at intervals along the longitudinal direction of the tunnel, a form is erected and form concrete is poured between every two adjacent concrete-filled steel tube arches, and the concrete-filled steel tube arches are formed by pouring early-strength concrete through adjustable prestressed steel tubes.The novel shallow-buried tunnel support structure applicable to the urban sensitive areas effectively solves the ubiquitous problems of excessive ground surface settlement, difficulty in deformation control, water leakage, lining cracking and the like in a current urban shallow-buried tunnel construction process so as to guarantee that ground surface buildings nearby the tunnel, pipelines along the tunnel and road traffic are not affected by underground engineering construction.

Description

technical field [0001] The invention belongs to the technical field of tunnels and underground engineering, and in particular relates to a new type of support structure for shallow-buried tunnels suitable for urban sensitive areas and a construction method thereof. Background technique [0002] With the rapid development of urban construction, there are more and more shallow buried and underground excavation projects, such as urban subways and large pipe networks. The existing shallow buried and underground excavation method is improved on the basis of the new Austrian method. The anchor shotcrete support is used as the initial support. Due to the limited thickness of the shotcrete shotcrete layer, the maximum thickness should not exceed 35cm and the amount of springback during the shotcrete process Larger; the ordinary steel arch is a passive support, which can only bear the relaxation load of the surrounding rock and cannot actively bear it. During the construction of the ...

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Problems solved by technology

[0003] Aiming at the defects and deficiencies in the prior art, the purpose of the present invention is to provide a new type of support structure and construction method for shallow-buried tunnels suitable for urban sensitive areas, which can effectively solve the common problems in the construction process of current urban shallow-buried tunnels. Surface settlement is too large, deformation is difficult to control, water leakage, lining cracking and other problems, so as to ensure that the surface buildings near the tunnel, pipelines along the line and road traffic will not be affected by underground construction

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