灌浆套筒-预应力组合连接装配式高墩设计思考及实践

Design Thinking and Practice of Grouting Sleeve-Prestressed Composite Connecting Fabricated High Pier

摘要:

为适应建筑的工业化发展和推广，桥梁预制装配技术在市政工程中得到了广泛的应用。灌浆套筒连接由于其传力机制明确，且连接构造简单，在桥梁下部结构的预制装配式连接中应用较多。在城市大型立交枢纽中，桥梁高度较高，常规的套筒连接装配式桥墩由于立柱尺寸和配筋受限，实际应用较困难。针对灌浆套筒-预应力组合连接装配式桥墩进行研究，结果表明：该连接形式通过施加预应力，可减小立柱尺寸，有效提高立柱的承载力；采用的带有自锁功能的钢绞线锚具，锚固性能可靠、施工工艺简单、质量易保证、成本较低；立柱节段间采用钢筋套筒连接及对砂浆垫层进行坐浆，可使施工快速、立柱不需匹配预制、受力可靠。灌浆套筒-预应力组合连接构造的设计经验可为日后同类装配式高墩的工程应用提供参考。

Abstract:

In order to adapt to the development and promotion of construction industrialization, the bridge prefabrication and assembly technology have been widely applied in municipal engineering. The grouting sleeve connection is widely used in prefabricated and assembled connections of bridge substructures due to its clear force transmission mechanism and simple connection structure. In large urban interchange hubs, the bridge height is relatively high, and the conventional sleeve connected prefabricated bridge piers are difficult to apply due to limited column size and reinforcement. The grouting sleeve-prestressed composite connecting fabricated pier is studied. The results show that this connection form can reduce the size of the column and effectively improve the bearing capacity of the column by applying prestress. The steel strand anchor with self-locking function has the characteristics of reliable anchoring performance, simple construction process, easy quality assurance and low cost. The column segments are connected by reinforced sleeve and the mortar cushion is starched, which can make the construction quick, the columns not need to be matched prefabricated and the stress reliable. The design experience of grouting sleeve-prestressed composite connecting structure can provide the reference for the engineering application of similar prefabricated high piers.