Hydraulic jacking system of transporting girder vehicle

Abstract

The invention belongs to hydraulic jacking systems, and relates to a hydraulic jacking system of a transporting girder vehicle, which comprises four hydraulic jacking cylinders loaded with displacement sensors, four electrical control proportioning valves, four ball valves, an operating handle, a controller and a warner, wherein the four hydraulic jacking cylinders are divided into two groups, that is, a front group and a rear group; rod chambers of the two hydraulic jacking cylinders in each group are connected by a hydraulic pipeline; one of the ball valves is arranged in the middle of the pipeline; likewise, rodless chambers of the two hydraulic jacking cylinders in the group are connected; when the four ball valves in the front group and the rear group are closed, the hydraulic jacking cylinders form four points for supporting a box girder; when the two ball valves in one group are closed, and the two ball valves in the other group are opened, the hydraulic jacking cylinders form four points acting on the box girder and three points for supporting the box girder so as to ensure that the box girder is not twisted during the lifting and transporting processes; during the process of the lifting of the box girder, the displacement sensors monitor the lifting heights of the cylinders in a real-time manner; and when the lifting speed of the some cylinder is too high, the controller gives out a command to the control valve to a proportional control valve to automatically adjust the lifting speed of the cylinders and further ensure that the box girder is not inclined during the process of lifting.

Description

technical field

[0001] The invention relates to a hydraulic jacking system, in particular to a hydraulic jacking system of a beam transport vehicle. Background technique

[0002] In the construction of high-speed railways in western my country, the box girder is often transported from the girder yard to the box girder erection site through a tunnel. The top surface interferes with the upper arch of the tunnel, so a hydraulic jacking system is now used to solve this problem. The specific method is: before the box girder is put on the beam transport vehicle, first adjust the jacking oil cylinder to a lower position, and then put the box girder on the jacking oil cylinder for transportation. When the box girder is transported to the construction site, the beam transport vehicle and frame After the bridge machine is docked, raise the jacking cylinder to a certain height, place the beam moving trolley at a proper position under the box girder, then lower the jacking cylinder,...

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