某下穿通道快速化预制拼装工艺总体设计方案

Overall Design Scheme of Rapid Prefabrication Process for an Underground Channel

随着国家城市化进程的不断加快,传统现浇工艺存在着施工质量相对较差、对周边环境影响较大、劳动力成本不断上升等一系列问题,与国家提出的高质量发展目标存在一定差距,为此国家从政策方面开始推行预制拼装工艺。以某斜交下穿通道工程采用预制拼装工艺为例,从结构分块、接缝形式及防水、吊点布置等关键环节进行了系统性的研究与探讨,提出了一整套的设计方案,为工程的建成提供了有力的技术支撑,同时也为类似工程提供了有意义的参考借鉴。

With the continuous development of the national urbanization process,the traditional cast-in-place process has a series of problems,such as relatively poor construction quality,great impact on the surrounding environment and rising labor cost,etc.,which are different from the high quality development goal proposed by the state.Therefore,the prefabrication technology is started to implement in China from the policy aspect.Taking the prefabrication process of an underground channel as an example,the key links of block structure,joint form,waterproof material and hoisting point layout are systematically studied and discussed.A set of design scheme is proposed.The relevant experience can provide the technical support for grouting density.In terms of detectability,there are the safety risks.On the basis of absorbing the advantages of the common pier joint types for cross-sea bridges and municipal elevated bridges,the wet joint type of locking steel joint with straight threaded sleeve or taper sleeve+small amount of cast-in-situ concrete is proposed.This kind of joint type is safe,reliable,economical and fast,which can be referred for the design and construction of the similar projects.