UHPC 湿接缝浇筑在排水工程中的施工应用控制

Construction Application Control of UHPC Wet Joint Pouring in Drainage Engineering

摘要:

预制拼装技术是水务结构施工工艺的重要发展趋势，接缝处理是当前预制拼装技术的关键技术难点。超高性能混凝土（UHPC）具有强度高、韧性大、耐久性好等技术优势，成为解决预制拼装结构接缝连接的有效途径。考虑到该技术在水务工程领域应用相对较少，根据实际工程开展了相关的研究。首先，针对UHPC湿接缝在排水结构的适用性问题、临时支撑的快速周转、高温与低温施工等难点进行了分析研究，通过全尺寸UHPC浇筑工艺试验，对施工参数进行了探索，并提出了高温与低温条件下浇筑策略。研究保证了UHPC湿接缝浇筑施工的顺利进行，有效提高了预制拼装施工效率，提升了湿接缝浇筑质量。

Abstract:

Prefabricated assembly technology takes on the critical development tendency of water structure construction technology. However, joint treatment is one of the key technical difficulties in current prefabricated assembly technology. The ultrahigh performance concrete (UHPC) has the technical advantages such as high strength, high toughness and good durability, which has become an effective way to solve the joint connection of prefabricated assembly structures. Considering that this technology is relatively rarely used in the field of water engineering, the related research has been conducted according to the actual engineering project. The analysis and study are carried out on the difficulties of applicability of UHPC wet joint in drainage structures, rapid turnover of temporary supports, high temperature and low temperature construction. The construction parameters are explored through the full-scale UHPC pouring process test. And the pouring strategy under the high temperature and low temperature conditions is proposed to ensure the smooth progress of UHPC wet joint pouring construction, effectively improve the efficiency of prefabricated assembly construction, and improve the quality of wet joint pouring.