The invention provides an integrated jack for a static load test of a building pile foundation. A piston of a piston body and the lower portion of an inner cavity of an oil cylinder form a loading pressure chamber, and the piston of the piston body and the upper portion of the inner cavity of the oil cylinder form an unloading pressure chamber. A cavity space is formed in a piston rod of the piston body. An oil storage region, a motor and a plunger pump are arranged in the cavity space. An oil inlet of the plunger pump is connected with the oil storage region. Two oil channels are formed in the wall of the oil cylinder and are communicated with the loading pressure chamber and the unloading pressure chamber respectively. Two working oil ports of a reversing valve are communicated with the two oil channels. An oil inlet of the reversing valve is communicated with the plunger pump, and an oil returning port of the reversing valve is communicated with the oil storage region. By means of the jack, the defects generated by a traditional lifting jack used for the field static load test can be obviously overcome, and the stability of the static load test and the accuracy of a measuring system can be improved through test equipment on the whole.
Integrated jack for static load test of building pile foundation
2015-12-16
Patent
Electronic Resource
English
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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|European Patent Office | 2024
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