The invention discloses an accurate tensioning jack for a whole bundle of prestressed steel strands, which belongs to the technical field of civil engineering construction and comprises a tensioning large jack body and a jack base mounted at one end of the tensioning large jack body, a large jack piston cavity is formed on the inner side of the tensioning large jack body, and a large jack piston is mounted in the large jack piston cavity in a sliding and sealing manner. The large top piston divides the large top piston cavity into a tensioning oil cylinder and a large back-jacking oil cylinder, the tensioning oil cylinder and the large back-jacking oil cylinder are connected with a tensioning oil nozzle and a large back-jacking oil nozzle respectively, the outer end of the large top piston stretches out towards the end away from the jack base, and adjusting screws are evenly installed on the end face of the outer end of the large top piston in the circumferential direction. The outer end of the adjusting screw is rotationally connected with a small pre-tensioning jack through a tailstock, and the axis of the small pre-tensioning jack is parallel to the axis of the large tensioning jack body. According to the device, under the condition of the same tensioning elongation, the tensioning force borne by each steel strand is the same, stress is more uniform, the tensioning quality meets the requirement, and tensioning is safer.

    本发明公开了一种整束预应力钢绞线精确张拉千斤顶,属于土木工程施工技术领域,包括张拉大顶本体、安装在张拉大顶本体一端的千斤顶基座,张拉大顶本体的内侧形成有大顶活塞腔,大顶活塞腔内滑动密封安装有大顶活塞,大顶活塞将大顶活塞腔分隔成张拉油缸和大回顶油缸,张拉油缸和大回顶油缸分别连接有张拉油嘴和大回顶油嘴,大顶活塞的外端朝向远离千斤顶基座的一端伸出,大顶活塞的外端端面上沿周向均匀安装有调节螺钉,调节螺钉的外端通过尾座转动连接有预拉小顶,预拉小顶的轴线与张拉大顶本体的轴线平行。本发明装置在相同张拉伸长量的条件下,使得每根钢绞线承受的张拉力相同,受力更为均匀,使得张拉质量满足要求,张拉更为安全。


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    Title :

    Precise tensioning jack for whole bundle of prestressed steel strands


    Additional title:

    一种整束预应力钢绞线精确张拉千斤顶


    Contributors:
    OU LIXIN (author) / LIU YI (author) / TIAN LAOHU (author) / YANG TONGQUAN (author) / CAI KUNKUN (author) / XU SONGQI (author) / JING XIANGYU (author) / SUN CHAO (author) / MA BIN (author) / DUAN WENXUAN (author)

    Publication date :

    2025-01-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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