Shield receiving construction system and construction method suitable for complex stratum

Abstract

The construction system comprises a pre-buried steel ring, the pre-buried steel ring is anchored in a secondary lining structure of an underground excavation transverse channel on the outer side of a shield receiving hole, an additional water stop device is fixedly installed on the inner arc face of the steel ring, and an adjustable jacking device is fixed to the outer ring face of the steel ring in a sealed mode; the primary supporting structure of the underground excavation transverse channel within the inner diameter range of the inner ring face and the primary supporting structure on the peripheral side are integrally cut and separated to form a primary supporting tunnel portal, and a traction device is arranged on the inner side of the primary supporting tunnel portal. The device is ingenious in structural design, deformation and displacement of the primary supporting tunnel portal can be restrained when the primary supporting tunnel portal is cut off, danger caused by structural instability is prevented, safe chiseling of the tunnel portal primary supporting structure and safe receiving of a shield tunneling machine can be achieved on the premise that the supporting and sealing functions of the underground excavation transverse channel primary supporting structure on stratum water and soil are not damaged, and the construction efficiency is improved. Therefore, the safety and stability of the whole receiving process of the shield tunneling machine are ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel shield construction, in particular to a shield receiving construction system and a construction method suitable for complex strata. Background technique [0002] With the development of urban construction, the problem of difficult land occupation for subway construction has become more and more prominent. During shield receiving and construction, due to the constraints of land occupation and pipeline problems, it is often impossible to construct open-cut shield receiving wells. Therefore, more and more projects use undercut horizontal passages to receive shield machines. The undercut transverse channel is generally located in the dense area of ​​ground buildings and underground pipelines. During the construction of the undercut transverse channel, there will be disturbance to the stratum. The tunnel receiving hole of the shield tunnel is a primary anchor shotcrete structure with poor rigidity. Dur...

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Problems solved by technology

However, the freezing method usually takes about 75 days, the construction period is long, and the cost is high. Once a water passage is formed between the shield body, segments, soil, and portal during the shield receiving process, the frozen body will melt in a short time , so as to lose the support and water blocking effect, and then cause danger; when receiving in a closed box, in order to avoid the steel grid in the initial support structure at the door from blocking the cutter head and spiral, the initial support structure needs to be completely chiseled first , the soil body will be exposed during the chisel removal process, resulting in the risk of cave door collapse. Secondly, the length of the airtight box usually needs to be greater than the length of the shield body. Due to the limited space inside the underground excavation cross passage, the airtight box is installed inside the underground excavation cross passage. , Filling soil and other operations are very difficult, which leads to long construction period and difficult construction

[0006] Based on the above-mentioned many technical problems existing in the removal of the initial support structure of the portal and the receiving shield machine in the transverse passage, there is no relevant and proper solution. Therefore, it is urgent to find an effective solution to solve the above problems

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