High-accuracy load control device for support axial force, and use method thereof

Abstract

The invention relates to the field of bracing devices for foundation pit support structures, and specifically relates to a high-accuracy load control device for a support axial force, and a use methodthereof. The high-accuracy load control device for the support axial force comprises a jack (1), and is characterized by further comprising a reversing valve (2), a ball valve (41), an unloading valve (42), a high-pressure overflow valve (43), an oil pressure gauge (5), an oil pump (6), an oil tank (7), a stepper motor (8) and a controller (9), wherein a first oil inlet port of the reversing valve (2) is connected with an oil inlet end of the jack (1) through a first oil pipe (31); a second oil inlet port of the reversing valve (2) is connected with an oil outlet end of the jack (1) through asecond oil pipe (32); and the second oil pipe (32) is further connected with an oil unloading pipe (35). The high-accuracy load control device for the support axial force is compact in size, convenient to use, high in acceleration response, and high in adaptability.

Description

technical field [0001] The invention relates to the field of support devices for foundation pit enclosure structures, in particular to a high-precision load control device for supporting axial force and a method for using the same. Background technique [0002] When supporting the foundation pit, it is necessary to adjust the axial force of the steel support at all times according to the change of the earth pressure on the rear side of the enclosure structure, and finally reach a dynamic force balance state to ensure that the enclosure structure does not undergo large horizontal displacement. The axial force of the steel support is generally realized by adjusting the hydraulic pressure of the support system axially connected with it. The existing support system is mainly controlled by the numerical control pump station to control the pressure of the hydraulic system, so as to achieve the effect of adjusting the axial force of the steel support. The hydraulic system of the n...

AI Technical Summary

Problems solved by technology

The traditional numerical control hydraulic system generally adjusts the axial force of the steel support through the frequency conversion motor and the hydraulic control check valve, but the response frequency of the frequency conversion motor is not high enough, it is difficult to cope with the frequent start and stop of the system, and the response to the load adjustment is often not timely enough. Hysteresis, while adjusting the hydraulic pressure with a hydraulic control check valve, when dealing with complex and irregular earth pressure changes, the accuracy of the axial force control of the steel support is not good

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