Construction method of enclosure structure with ultra-short underground walls

Abstract

The invention relates to a foundation pit project in the civil transportation construction industry, in particular to a construction method of an enclosure structure with ultra-short underground walls, wherein the enclosure structure is used for a foundation pit therebelow which is used for the construction of leading a tunnel to pass through a shield zone, and the method comprises the following steps: carrying out trench forming construction according to the size of each pair of the ultra-short underground walls to be constructed, wherein the bottom of the dug trench section is positioned not less than 0.5m above the top of a shield; then hoisting and placing a steel bar cage and filling concrete in the trench section for constructing the pair of the ultra-short underground walls; further carrying out the trench forming construction between the ultra-short underground walls for constructing the trench section which is vertical to the ultra-short underground walls, wherein the bottom of the trench section is leveled with the bottom of the trench section of the ultra-short underground walls; and hoisting and placing the steel bar cage and filling the concrete in the trench section for constructing transverse underground wall short walls. The construction method has the advantage of ensuring the smooth passing through of the shield at later stage; compared with the traditional practice of leading the shield to pass through glass fiber bar underground walls, the shield does not need to pass through the underground walls, thereby reducing the project risk and the cost.

Description

technical field [0001] The invention relates to a foundation pit project in the civil engineering, transportation and construction industry, and in particular to a construction method for a foundation pit and an enclosure structure with an ultra-short underground wall, which is used for tunnel crossing construction in a shield section below it. Background technique [0002] In urban transportation construction, it often happens that after the foundation pit structure is excavated on the ground, the shield section tunnel crossing construction is carried out below it. The construction of the foundation pit generally involves the surrounding enclosure structure: the reinforced concrete underground diaphragm wall cast on site, and usually in order to ensure the overall stability of the foundation pit during excavation, the insertion ratio of the underground wall is generally greater than 0.7. In other words, the tunnel boring machine will need to drill through the underground wa...

AI Technical Summary

Problems solved by technology

Even so, judging from the existing project implementation experience, there are still relatively large construction risks in the later shield cutting through the underground wall

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