A seamed pipe curtain for submerged tunnels in water-rich strata

Abstract

The invention discloses an occlusive pipe curtain for a bored tunnel in a water-rich stratum and a construction method of the occlusive pipe curtain. The occlusive pipe curtain for the bored tunnel in the water-rich stratum comprises an occlusive pipe curtain body which is horizontally arranged along a tunnel excavation contour line. The occlusive pipe curtain body comprises clay-cement occlusive piles and concrete filled steel tube occlusive piles, wherein every two adjacent clay-cement occlusive piles are spaced from each other by a jump hole, and each concrete filled steel tube occlusive piles is arranged between the corresponding adjacent clay-cement occlusive piles. The invention further discloses the construction method of the occlusive pipe curtain for the bored tunnel in the water-rich stratum. The construction method comprises the following steps that the clay-cement occlusive piles are horizontally constructed along the tunnel excavation contour line; the concrete filled steel tube occlusive piles are constructed between the adjacent clay-cement occlusive piles; and a tunnel section is excavated step by step, and a steel tunnel body supporting frame is erected. According to the occlusive pipe curtain for the bored tunnel in the water-rich stratum and the construction method of the occlusive pipe curtain, a box type waterproof curtain body is formed through the occlusive pipe curtain body arranged outside the tunnel excavation contour line and a grout-preventing wall on the side wall of a transverse construction channel jointly, so that the waterproof effect of the tunnel excavation section is achieved; a supporting system is formed by the occlusive pipe curtain body and the steel tunnel body supporting frame jointly, and the technical effect of effectively controlling the deformation of the stratum can be achieved due to the fact the supporting and bearing capacity of the supporting system is high .

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an articulating pipe curtain for tunnels excavated in water-rich formations. Background technique [0002] At present, shallow burial and underground excavation methods (PBA method, partial excavation method, etc.) all take anhydrous conditions as the prerequisite for implementation in terms of technology. In subway construction and other on-site construction without precipitation conditions, a large amount of grouting is generally used to reinforce the soil around the cavern to form a water-resistant layer to realize the excavation of the underground structure. The disadvantage of this grouting water-stopping process is that a relatively strictly closed barrier is required to prevent groundwater from entering the hole, but the uncertainty of soil grouting makes it difficult to control accurately, and the operation It can only be enlarged in scale, increasing the sco...

AI Technical Summary

Problems solved by technology

The disadvantage of this grouting water-stopping process is that a relatively strictly closed barrier is required to prevent groundwater from entering the hole, but the uncertainty of soil grouting makes it difficult to control accurately, and the operation It can only be enlarged in scale, increasing the scope of grouting reinforcement, resulting in greater waste; a large amount of stratum grouting often brings unexpected damage to surrounding underground structures; a large amount of grouting (including additives) brings certain deterioration of stratum characteristics and certain groundwater pollution; the grouting process operation is independent of the excavation operation, requiring separate equipment and additional process links, especially in pebble formations, the efficiency of drilling grouting holes is extremely low, resulting in extremely slow construction progress; the effect of grouting water blocking Difficult to guarantee, especially in high confined water formations and sand and pebble formations, it is often difficult to achieve the expected effect of grouting water plugging

The main advantages of this construction method are: the construction has little impact on the surrounding environment, and the ground subsidence is very small. Under the condition of doing a good job of grouting outside the segment and blocking water, it can effectively reduce the impact of groundwater on the excavation of the main earthwork; the main disadvantages are: cost In addition, this method carries out a large number of processes such as cutting, welding, sealing, forming, binding, pouring, etc. in a pipe curtain with a diameter of 2m. The on-site operating conditions and working environment are poor, and the construction progress is slow.

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