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A platform for research: civil engineering, architecture and urbanism
Method for preventing and treating L-shaped cracks of hollow slab girder bridge
The invention discloses a hollow slab girder bridge L-shaped crack control method, which is realized by arranging prestressed tendons in a hollow slab boundary beam preparation process, and specifically comprises the following process steps: 1, lofting and positioning; 2, mounting an anchoring device; 3, tension prestress is determined; 4, pulling the prestressed tendons; 5, tensioning and anchoring the prestressed tendons; and 6, end sealing and completion. According to the method, aiming at the L-shaped crack, structural reinforcement and crack prevention and control are combined, a calculation method of the prestress needed by bridge reinforcement is innovatively provided, and the calculated prestress value is adopted for reinforcement. Prestress is applied to a boundary beam midspan parting area, so that the stress amplification effect caused by a guardrail parting is counteracted, the stress state of a side plate is improved, cracks are prevented, and the durability of an original structure is improved. Development of novel L-shaped cracks is restrained from the source, the reinforcement cost is greatly reduced, the reinforcement construction period is shortened, and the traffic recovery time is shortened.
本发明公开了一种空心板梁桥L型裂缝防治方法，通过在空心板边梁制备过程中内部设置预应力筋的方式来实现，具体包括如下工艺步骤：1、放样定位；2、锚固装置安装；3、确定张拉预应力；4、预应力筋穿束；5、预应力筋张拉并锚固；6、封端，完工。本发明针对L型裂缝，将结构补强和裂缝防治相结合，创新地提出桥梁加固所需预应力计算方法，采用计算所得的预应力值进行加固。通过对边梁跨中分缝区施加预应力，进而抵消护栏分缝引起的应力放大效应，改善边板受力状态，防治裂缝的发生，提升原结构耐久性。从源头上遏制了新型L型裂缝的发展，极大降低了加固成本，缩短了加固施工工期，减少了交通恢复时间。
Method for preventing and treating L-shaped cracks of hollow slab girder bridge
The invention discloses a hollow slab girder bridge L-shaped crack control method, which is realized by arranging prestressed tendons in a hollow slab boundary beam preparation process, and specifically comprises the following process steps: 1, lofting and positioning; 2, mounting an anchoring device; 3, tension prestress is determined; 4, pulling the prestressed tendons; 5, tensioning and anchoring the prestressed tendons; and 6, end sealing and completion. According to the method, aiming at the L-shaped crack, structural reinforcement and crack prevention and control are combined, a calculation method of the prestress needed by bridge reinforcement is innovatively provided, and the calculated prestress value is adopted for reinforcement. Prestress is applied to a boundary beam midspan parting area, so that the stress amplification effect caused by a guardrail parting is counteracted, the stress state of a side plate is improved, cracks are prevented, and the durability of an original structure is improved. Development of novel L-shaped cracks is restrained from the source, the reinforcement cost is greatly reduced, the reinforcement construction period is shortened, and the traffic recovery time is shortened.
本发明公开了一种空心板梁桥L型裂缝防治方法，通过在空心板边梁制备过程中内部设置预应力筋的方式来实现，具体包括如下工艺步骤：1、放样定位；2、锚固装置安装；3、确定张拉预应力；4、预应力筋穿束；5、预应力筋张拉并锚固；6、封端，完工。本发明针对L型裂缝，将结构补强和裂缝防治相结合，创新地提出桥梁加固所需预应力计算方法，采用计算所得的预应力值进行加固。通过对边梁跨中分缝区施加预应力，进而抵消护栏分缝引起的应力放大效应，改善边板受力状态，防治裂缝的发生，提升原结构耐久性。从源头上遏制了新型L型裂缝的发展，极大降低了加固成本，缩短了加固施工工期，减少了交通恢复时间。
Method for preventing and treating L-shaped cracks of hollow slab girder bridge
一种空心板梁桥L型裂缝防治方法
LI CUIHUA (author) / LIU XUELIANG (author) / PENG WEIBING (author) / HUANG XINGYU (author)
2024-07-05
Patent
Electronic Resource
Chinese
| European Patent Office | 2022
| European Patent Office | 2022
Efficient shear-resistant reinforcing method for prestressed hollow slab girder bridge
| European Patent Office | 2023