Composite lining structure of shield water delivery tunnel, and construction method for same

Abstract

The invention discloses a composite lining structure of a shield water delivery tunnel, and a construction method for the same. The composite lining structure of the water delivery tunnel comprises ashield tunnel pipe sheet on an outmost layer and a steel lining on an inner layer, wherein the steel lining is cylindrical; and a reinforcement ring is welded on the outer surface of the steel lining.The composite lining structure is characterized in that a flexible liner is disposed at a degree of 240 DEG-300 DEG on the outer surface of the steel lining; a drainage floral tube is disposed on theouter surface of the steel lining; a longitudinal drainage pipe is disposed on the bottom of the inner side of the shield tunnel pipe sheet; the drainage floral tube communicates with the longitudinal drainage tube by a connecting conduit; and a concrete filling layer is filled between the shield tunnel pipe sheet and the steel lining and between the shield tunnel pipe sheet and the flexible liner. The composite lining structure disclosed by the invention has the beneficial effects that bearing proportions of tubes on different composite lining layers can be allocated rationally; a bearing advantage of tube materials can be exerted; a possibility in cracking and breaking of the concrete filling layer and the shield tunnel pipe sheet is reduced; and with a systematic meshed drainage system, inward sinking and swelling on pipe walls of the steel lining caused by accumulation of external water pressures can be avoided, and pipeline water delivery efficiency is ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a composite lining structure of a water delivery tunnel and a construction method thereof. Background technique [0002] Shield water conveyance tunnel is an underground structure system constructed in rock (soil) by shield method, and it is an important part of underground water conveyance project. Especially when the water conveyance tunnel is buried deep underground, the water conveyance tunnel faces unfavorable conditions such as high internal and external water pressure, high surrounding rock pressure, and complex stratum conditions. At present, multi-layer lining is often used. There are three main problems faced. First, the outer concrete lining cracks under the high internal water pressure of the water conveyance tunnel lining structure, which will lead to the overall degradation of the bearing performance of the lining structure; second, after the concrete lin...

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Problems solved by technology

[0004] However, the existing water tunnel lining structure has the following defects: (1) The overall stiffness of the double-layer lining structure is too small, and the concrete lining structure is prone to serious cracking under high internal water pressure; (2) Although the three-layer lining structure is integral The rigidity is relatively high, but due to the unreasonable load sharing ratio, it will also lead to excessive load bearing of the concrete lining and the overall or partial cracking and damage; (3) The drainage system of the lining structure is single in structure, lacks systematicness, and has a high probability of blockage, which will cause The accumulation of water pressure will cause the steel lining to become concave and bulging and unstable; (4) the cracking and damage of the concrete lining will lead to an increase in maintenance costs during operation and reduce the durability and service life of the lining structure of the water conveyance tunnel

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