Supporting head assembly, supporting axial force servo system and driving mode of supporting axial force servo system

Abstract

The invention relates to a supporting head assembly. The supporting head assembly comprises a main frame, an oil tank arranged in the main frame, a controller, a pump station, a hydraulic motor, a threaded rod, a center hole jack and a bearing device; the center hole jack comprises a cylinder body and a piston, the center of the cylinder body is through, and a through center hole is formed in thecylinder body; the bearing device comprises a bearing piece, a ball head support clamped at the end of the bearing piece and a bearing plate connected to the bearing piece through the ball head support; the hydraulic motor and the threaded rod are arranged at the rear end of the center hole of the center hole jack, the bearing device is arranged at the front end of the center hole of the center hole jack. The front end of the piston abuts against the bearing piece, the controller is used for controlling the pump station to load or unload the center hole jack so as to drive the bearing device to move front and back, and the controller is also used for controlling the hydraulic motor to drive the threaded rod to advance and retreat forwards and backwards so as to lock or unlock the bearing device.

Description

technical field [0001] The invention relates to the field of deformation control of foundation pit enclosure structures in foundation pit engineering, in particular to a support head assembly for displacement control of foundation pit enclosure structures, a support axial force servo system and a driving method thereof. Background technique [0002] The foundation pit is a temporary structure, which is an underground pit well that provides construction space for the foundation of the building or the underground structure. The side wall of the foundation pit needs to be supported during excavation to prevent the deformation of the foundation pit from causing damage to adjacent buildings. The underground components are damaged. Concrete support has been gradually replaced by steel support due to the long construction period, difficulty in dismantling after the support work is completed, and waste of materials. At present, most projects only use concrete support in the first su...

AI Technical Summary

Problems solved by technology

Concrete support has been gradually replaced by steel support due to the long construction period, difficulty in dismantling after the support work is completed, and waste of materials. At present, most projects only use concrete support in the first support of the foundation pit, and the rest use steel support.

Generally, when rigid supports are used, prestress is applied according to design requirements, but during construction, as time goes by, the prestress applied to steel supports will decrease, sometimes by a lot, even by more than 50%. At this time, it is difficult to apply the supporting axial force, which causes the displacement of the foundation pit enclosure structure. When the displacement is too large, it will directly affect the safety of buildings, roads, subways, etc. next to the foundation pit.

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