Method for connecting intermittent discrete steel structure pipe joints jacked in batches and tunnel portal

Abstract

The invention discloses a method for connecting intermittent discrete steel structure pipe joints jacked in batches and a tunnel portal. The method comprises the following steps that 1, anchor bars and a tunnel portal ring are pre-embedded on the side wall of a lining of the tunnel portal, and the anchor bars and the tunnel portal ring are fixed; 2, a grouting pipe is pre-buried in the side wall of the lining; and 3, the steel pipe joints are jacked, and after jacking of the steel pipe joints is completed, a gap between the side wall of the lining and the steel pipe joints is blocked by grouting in the grouting pipe. The tunnel portal ring and the steel pipe joints are connected and sealed through end sealing plates, a waterproof barrier is formed, water flowing out of a gap between a pipe piece and the working well tunnel portal is effectively blocked, and the safety of the tunnel portal in a pipe jacking construction period is fundamentally guaranteed; construction is convenient and fast, operation is easy, the connection forming effect is good, and the welding quality is guaranteed; compared with a traditional connecting port, a post-pouring ring beam does not need to be constructed, economic benefits are high, and operability is high.

Description

technical field [0001] The invention relates to the technical field of underground structures, in particular to a method for connecting discrete steel structure pipe joints with gaps and portals jacked in batches. Background technique [0002] With the rapid development of my country's economy and the continuous increase of population density, there are fewer and fewer ground resources that can be developed, and the land utilization rate has become saturated. Therefore, the development of cities into underground space is an inevitable trend of the development of international metropolises. [0003] The underground excavation method in the prior art has gradually become the preferred method for constructing underground structures in complex environments due to its advantages of less interference to the ground environment. As a kind of underground excavation method, the pipe curtain method has the advantages of low noise during construction, small surface settlement, low cons...

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Problems solved by technology

[0004] When the existing pipe curtain method is used, in the construction of connecting the pipe joint and the opening of the working well, the ring beam of the opening is usually constructed after the pipe joint is jacked and penetrated. It takes a long time, and there is a gap between the pipe joint and the working well structure, and The steel pipe joints are jacked in batches, and groundwater and fine sand are easy to flow out of the gaps, and take away the cement slurry in the concrete, making it difficult to guarantee the construction quality of the door ring beam, resulting in more leakage points after the door ring beam is closed , the plugging effect of grouting in the later stage is also limited, and even the ground subsidence is caused by the loss of groundwater and soil through the gap, which poses a major risk

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