隐盖梁小箱梁设计关键工序施工技术探析

Analysis on Key Construction Techniques for Design of Hidden Bent Cap and Small Box Beam

摘要:

隐盖梁小箱梁设计是将桥梁的盖梁与横梁设计成一体，通过现浇横梁将两侧搭设在临时支架上的预制小箱梁进行联结，最终形成连续箱梁结构，改变了传统的将箱梁安装在盖梁顶临时支座上，先简支后连续的施工方法。该设计在徐州市城市快速路改造项目中首次应用，设计、施工等方面效果显著，能有效降低桥梁高度，提高桥下地面道路净空，缩短引道及匝道长度，减少占用土地，充分利用城市有限空间，且具有结构形式美观、施工进度快、质量可靠、节能环保等优点，但其关键工序小箱梁架设及横梁现浇施工技术复杂、安全风险高，结合工程实践，对关键工序的施工工艺和技术进行探析，提出具体施工技术措施，为大家提供更多工程实践经验。

Abstract:

The design of hidden bent cap and small box beam is to integrate the bent cap and crossbeam of the bridge. The prefabricated small box beams erected on both sides on temporary supports are connected by cast-in-place crossbeams, ultimately forming a continuous box beam structure, which changes the traditional construction method of installing the box beam on the temporary support on the top of the bent cap, and simple-supporting first and then continuous. This design was first applied in the urban expressway renovation project in Xuzhou City, with significant effects in design and construction, which can effectively reduce the height of bridges, improve the clearance of ground roads under bridges, shorten the length of approach roads and ramps, reduce the land occupation, fully utilize the limited urban space, and has the advantages of beautiful structural form, fast construction progress, reliable quality, energy conservation and environmental protection. However, the key processes of small box beam erection and crossbeam cast-in-place construction technology are complex and have high safety risks. Based on engineering practice, the construction technology and techniques of key processes are analyzed, and the specific construction technical measures are proposed, providing more engineering practice experience for everyone.