The invention relates to a single-liquid-path composite piston type jack for a load box. The single-liquid-path composite piston type jack is mainly used in a self-balancing static load test of a foundation pile. The composite piston type jack for the load box comprises a cylinder body and a piston, wherein a cylinder body top plate is connected with a load box top plate, a through hole for allowing the piston to move up and down is formed in a cylinder body bottom plate, and a liquid inlet is formed in the side wall of the cylinder body; and the piston comprises a convex piston and a concave piston, the convex piston body comprises a piston plate and a piston column, the piston plate is located at the top of the piston column, a protrusion is arranged at the top of the piston plate, the piston column is inserted into an inner cavity of the concave piston, a channel is formed in the convex piston and used for communicating the concave piston with the liquid inlet, a liquid outlet is formed in the side wall of the concave piston, and a bottom plate of the concave piston is connected with a load box bottom plate. The composite piston type jack has the following advantages that 1, small-area and large-tonnage pressurization detection is realized; 2, the strength and integrity of a pile body of the foundation pile are ensured; 3, the machining difficulty is reduced; and 4, after static-load pile testing is achieved, a loading liquid is discharged firstly, and then grouting is carried out.

    本发明涉及一种用于荷载箱的单液路复合活塞式千斤顶,主要用于基桩自平衡静载试验中。一种用于荷载箱的复合活塞式千斤顶,包括缸体和活塞,缸体顶板与荷载箱顶板连接,缸体底板上开设有容活塞上下移动的通孔,缸体侧壁上开设有进液口;活塞包括凸形活塞、凹形活塞,凸形活塞包括活塞板、活塞柱,活塞板位于活塞柱顶部,其顶部设有凸起,活塞柱插入凹形活塞内腔,在凸形活塞上开设有通道,用于连通凹形活塞与进液口,在凹形活塞的侧壁上开设有出液口,凹形活塞的底板与荷载箱底板连接。本发明具有如下优点:1、实现了小面积大吨位的加压检测;2、保证了基桩桩身强度及完整性;3、降低了加工难度;4、实现了静载试桩后,先排出加载液,再进行注浆。


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    Title :

    Composite piston type jack for load box


    Additional title:

    一种用于荷载箱的复合活塞式千斤顶


    Contributors:
    QIAN KUN (author) / CHEN XIONG (author) / ZHANG ZHI (author) / LU PING (author) / WU XIAN (author) / CHEN LEI (author)

    Publication date :

    2021-05-28


    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 / E02D FOUNDATIONS , Gründungen



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