T/JSTJXH 6-2022 Urban rail transit engineering shield pipe component prefabrication and assembly technical standards

Scope

Main technical content: At present, cities such as Nanjing, Wuxi, Suzhou, Xuzhou, Changzhou, and Nantong in our province have started construction of urban rail transit projects. There are many construction lines, most of which are underground lines, and the demand for precast concrete segments is huge. However, from the current situation, the existing national design, production, testing, and production-related standards for precast concrete segments lack uniformity and are not closely integrated with the production process. In particular, there is a lack of standard provisions for process control; some technical indicators are set too low or are not clear enough; the quality of finished segments is uneven, and quality problems occur from time to time. To effectively improve the production quality of precast concrete segments, standardize the production process and inspection procedures of segments, and reduce quality problems, based on the current national standards and norms for segment design and production, and relying on urban rail transit construction projects, combined with the actual situation of our province, the "Technical Regulations for Concrete Segments of Urban Rail Transit in Jiangsu Province" are compiled. Unified technical standards for segment production are formulated in aspects such as raw materials and concrete mix ratios, molds and assembly, steel reinforcement cage production, concrete pouring, segment curing, demoulding and repair, finished product inspection, and marking. This will provide important guidance for standardizing the production of precast concrete segments for urban rail transit in our province in the future.

Development Information

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