Abstract
With the rapid development of urban rail transit construction, the development and utilization of underground space is increasing. Water leakage in underground structures not only affects the normal use of buildings and reduces the surface aesthetic quality of structures, but also long-term water leakage can easily lead to corrosion of structural reinforcement, thereby reducing structural safety. Therefore, water leakage control during structural construction is particularly important. This article takes the No. 2 shield tunnel conversion section of Shanghai Rail Transit Chongming Line as an example, introducing measures such as non-destructive leakage detection of diaphragm walls, optimization of structural back-construction procedures, and installation of wall-penetrating embedded parts for drainage in the lining wall, which greatly reduce the risk of water leakage in the structure, ensure project quality, and provide reference for similar underground structure water leakage control in the future.
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Preamble
Study on Seepage and Leakage Water Control of the Foundation Pit at the Shield Transition Section of Line 2, Chongming Line, Shanghai Metro
Chen Wenyu¹
(¹ Shanghai Tunnel Engineering Co., Ltd., Shanghai 200000, China)
Abstract
With the rapid development of urban rail transit construction, the utilization and development of underground space has become increasingly extensive. Seepage and leakage in underground structures not only affect normal operation and degrade the visual quality of structural surfaces, but also lead to reinforcement corrosion over time, compromising structural safety. Consequently, controlling seepage and leakage during construction is of paramount importance. Taking the shield transition section of Line 2 of the Shanghai Metro Chongming Line as a case study, this paper presents measures including non-destructive leakage detection of diaphragm walls, optimization of the structural reconstruction sequence, and installation of embedded wall-penetrating drainage components in the lining wall. These measures significantly reduced the risk of structural seepage and leakage, ensured project quality, and provide valuable reference for similar underground structure seepage control projects in the future.
Keywords: seepage and leakage; diaphragm wall; wall-penetrating embedded components; quality control