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A platform for research: civil engineering, architecture and urbanism
Releasing and tensioning device adopting pre-tensioning method and used for prestressed ribs on upper flange of precast concrete beam
The invention relates to a releasing and tensioning device adopting a pre-tensioning method and used for prestressed ribs on an upper flange of a precast concrete beam, and belongs to the technical field of prestressed construction for bridges. The releasing and tensioning device adopting the pre-tensioning method and used for the prestressed ribs on the upper flange of the precast concrete beam comprises an anchoring unit and a releasing and tensioning unit, wherein the anchoring unit comprises a tensioning counter-force beam and a steel backing plate welded to the tensioning counter-force beam, an anchorage device for anchoring the prestressed ribs is arranged at one end, away from the tensioning counter-force beam, of the steel backing plate, and a U-shaped clamping plate is arranged between the anchorage device and the steel backing plate; and the releasing and tensioning unit comprises a releasing and tensioning base welded to the tensioning counter-force beam, tensioning supporting feet are fixedly connected to the releasing and tensioning base, through holes allowing the prestressed ribs to penetrate through are formed in the tensioning supporting feet, and tensioning equipment for releasing and tensioning the prestressed ribs step by step is arranged at the tail ends of the tensioning supporting feet. According to the invention, when the prestressed ribs are released and tensioned, the tensioning equipment only needs to tension the prestressed ribs to reach a designed tensioning force, and then the U-shaped clamping plate is detached. Tension required for releasingand tensioning the prestressed ribs does not need to exceed a force applied during tensioning, so that the risk that the prestressed ribs are broken due to overlarge stress is fundamentally avoided.
本申请涉及一种先张法预制混凝土梁上翼缘预应力筋放张装置，属于桥梁预应力施工技术领域，包括：锚固单元，其包括张拉反力梁和焊接在张拉反力梁上的钢垫板，钢垫板上远离张拉反力梁的一端设有锚固预应力筋的锚具，锚具与钢垫板之间设有U形卡板；放张单元，其包括焊接在张拉反力梁上的放张底座，放张底座上固定连接有张拉撑脚，张拉撑脚上开设有穿入预应力筋的通孔，张拉撑脚的末端设有逐级放张预应力筋的张拉设备。本申请对预应力筋放张时，张拉设备只需将预应力筋张拉至设计张拉力，然后拆除U形卡板。使得预应力筋放张所需的拉力无需超过张拉时所施加的力，从根本上规避了预应力筋因应力过大出现断裂的风险。
Releasing and tensioning device adopting pre-tensioning method and used for prestressed ribs on upper flange of precast concrete beam
The invention relates to a releasing and tensioning device adopting a pre-tensioning method and used for prestressed ribs on an upper flange of a precast concrete beam, and belongs to the technical field of prestressed construction for bridges. The releasing and tensioning device adopting the pre-tensioning method and used for the prestressed ribs on the upper flange of the precast concrete beam comprises an anchoring unit and a releasing and tensioning unit, wherein the anchoring unit comprises a tensioning counter-force beam and a steel backing plate welded to the tensioning counter-force beam, an anchorage device for anchoring the prestressed ribs is arranged at one end, away from the tensioning counter-force beam, of the steel backing plate, and a U-shaped clamping plate is arranged between the anchorage device and the steel backing plate; and the releasing and tensioning unit comprises a releasing and tensioning base welded to the tensioning counter-force beam, tensioning supporting feet are fixedly connected to the releasing and tensioning base, through holes allowing the prestressed ribs to penetrate through are formed in the tensioning supporting feet, and tensioning equipment for releasing and tensioning the prestressed ribs step by step is arranged at the tail ends of the tensioning supporting feet. According to the invention, when the prestressed ribs are released and tensioned, the tensioning equipment only needs to tension the prestressed ribs to reach a designed tensioning force, and then the U-shaped clamping plate is detached. Tension required for releasingand tensioning the prestressed ribs does not need to exceed a force applied during tensioning, so that the risk that the prestressed ribs are broken due to overlarge stress is fundamentally avoided.
本申请涉及一种先张法预制混凝土梁上翼缘预应力筋放张装置，属于桥梁预应力施工技术领域，包括：锚固单元，其包括张拉反力梁和焊接在张拉反力梁上的钢垫板，钢垫板上远离张拉反力梁的一端设有锚固预应力筋的锚具，锚具与钢垫板之间设有U形卡板；放张单元，其包括焊接在张拉反力梁上的放张底座，放张底座上固定连接有张拉撑脚，张拉撑脚上开设有穿入预应力筋的通孔，张拉撑脚的末端设有逐级放张预应力筋的张拉设备。本申请对预应力筋放张时，张拉设备只需将预应力筋张拉至设计张拉力，然后拆除U形卡板。使得预应力筋放张所需的拉力无需超过张拉时所施加的力，从根本上规避了预应力筋因应力过大出现断裂的风险。
Releasing and tensioning device adopting pre-tensioning method and used for prestressed ribs on upper flange of precast concrete beam
一种先张法预制混凝土梁上翼缘预应力筋放张装置
NI YU (author) / LU SHENGCHENG (author) / LI XUDONG (author) / PAN JUN (author) / XU PING'AN (author) / REN XIAOMING (author) / YU BENJUN (author) / LEI YUNHUA (author) / WANG KAIPENG (author)
2021-03-05
Patent
Electronic Resource
Chinese
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