An assembled construction method for backfilling the bottom of a shield tunnel
A construction method and technology for shield tunneling, which are applied to tunnels, fillings, earth-moving drilling and mining, etc., can solve the problems of construction organization and material transportation organization, long concrete curing time, poor construction operation environment, etc., and shorten the construction time. The effect of reducing the construction period, reducing construction safety risks, and improving construction quality
Active Publication Date: 2019-07-19
CHINA RAILWAY DESIGN GRP CO LTD
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Problems solved by technology
According to the current level of construction technology, the backfilling of the tunnel bottom of the shield tunnel is basically cast-in-place construction, that is, after the tunnel is penetrated, the tunnel bottom is backfilled in the tunnel; the investment in cast-in-place construction is relatively large, and the construction rate is low. Arrangement and material transportation organization are more troublesome, the construction environment is relatively poor, and the concrete curing time after cast-in-place is longer
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Embodiment
[0046] 1. Production of prefabricated blocks for tunnel bottom backfill
[0047] (1) The backfill prefabricated block at the bottom of the tunnel is prefabricated in advance with high-precision steel molds in the factory. The structural section is crescent-shaped, the lower surface is arc-shaped, concentric with the surface of the shield segment, and the upper surface is horizontal. It is a concrete solid structure; it is assembled and constructed synchronously with the shield tunnel segment to speed up the construction speed of the backfill structure at the bottom of the tunnel.
[0048] (2) The width of the prefabricated block is 4.29m, and the height is 0.61m, so as to meet the walking of the supporting trolley behind the shield machine; in order to facilitate the assembly and fixation of the prefabricated structure, four supports are set on the lower surface of the prefabricated block, and the size is 500mm (L) × 300mm (width) × 50mm (height), reserve a 50mm-thick gap in t...
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The invention discloses a shield tunnel bottom backfill fabricated construction method. The backfill fabricated construction method comprises the following steps that firstly, during the constructionof a shield tunnel, precast blocks and shield pipe pieces are fabricated simultaneously, and the blocks are connected by bolts; then, grouting materials are injected into the space between the lower surfaces of the precast blocks and the inner surfaces of the pipe pieces through grouting holes reserved on the precast blocks; in addition, cast-in-place of a leveling layer of a construction track base plate and differential-settlement longitudinal beams arranged on corresponding areas of both sides of the precast blocks is carried out on the upper surfaces of the precast blocks. By engineering practice verification, according to the shield tunnel bottom backfill fabricated construction method, tunnel backfill and the shield tunnel can be constructed synchronously, the construction efficiencyof tunnel backfill is enhanced, the overall construction period of the shield tunnel is shortened, the operation environment of tunnel bottom backfill is improved, and the construction safety risk isreduced.
Description
technical field [0001] The invention belongs to the field of backfill construction at the bottom of a shield tunnel, and in particular relates to an assembled construction method for backfill at the bottom of a shield tunnel. Background technique [0002] With the development and utilization of urban underground space, the shield tunneling method has gradually become the main method for constructing urban underground tunnels due to its advantages of high efficiency, rapidity, safety and reliability. According to the current level of construction technology, the backfilling of the tunnel bottom of the shield tunnel is basically cast-in-place construction, that is, after the tunnel is penetrated, the tunnel bottom is backfilled in the tunnel; the investment in cast-in-place construction is relatively large, and the construction rate is low. Arrangement and material transportation organization are more troublesome, the construction environment is relatively poor, and the concre...
Claims
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IPC IPC(8): E21D9/06E21F15/00
CPCE21D9/0607E21F15/00
Inventor 唐伟王乐明王世清张继清贾辉万自强
Owner CHINA RAILWAY DESIGN GRP CO LTD