Testing machine for testing reciprocating load adjustable concrete member hydraulic fracture

Abstract

The invention provides a reciprocating load adjustable concrete member hydraulic fracture testing machine. The reciprocating load adjustable concrete member hydraulic fracture testing machine comprises a power transmission frame, an anticlockwise transmission gear, an indirect gear, a clockwise transmission gear, a one-way bearing, a crankshaft, a transmission link, a guide rail, an axial force sensor, an actuation connecting rod, a convex type loading frame, a concave type loading frame, a bearing, a force transferring steel shaft, a high pressure sealed cylinder, a sealed cylinder connecting rod, a non-contact type flash ranging window, an exhaust vent and a water filling pipe, wherein the power transmission frame drives the anticlockwise transmission gear and the clockwise transmission gear to rotate in sequence, further the convex type loading frame and the concave type loading frame move up and down alternatively, and reciprocated load loading can be achieved; the one-way bearing can rotate to change direction freely, and can be used for adjusting different tooth number meshed regions of gears, so as to adjust different repeated loadings. The testing machine provided by the invention is multifunctional, the process is safe and controllable, the operation is simple and convenient, the structure is simple, and the testing machine can be used for researching the problem of hydraulic fracture of concrete members under high water pressure and reciprocating loading effects.

Description

technical field [0001] The invention belongs to the technical field of hydraulic splitting simulation experiments of hydraulic concrete buildings, in particular to a testing machine for testing hydraulic splitting of concrete components under different reciprocating loads. It is suitable for exploring the mechanism and law of hydraulic splitting of hydraulic concrete structures under different reciprocating loads, and can also be used to study methods to reduce the damage of hydraulic splitting. Background technique [0002] Concrete is one of the main engineering materials in hydraulic structures. During the construction and operation of hydraulic projects, cracks will inevitably appear due to various factors. Below, physical phenomena such as expansion, expansion, and interpenetration are collectively referred to as hydraulic fracturing. However, in traditional concrete structure design, it is often easy to ignore the influence of water load in cracks on the structure, wh...

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Problems solved by technology

The former cannot apply hydrodynamic load because the crack is completely inside the specimen, and can only measure the hydrostatic pressure when the specimen splits and the final expansion path of the crack after the split ends, and cannot observe the real-time process of splitting; the latter Most of them can only apply static load or impact load, and the cracks can only open in one direction. Some patents suggest using springs or magnets to provide tension to dynamically close the cracks. However, the tension provided is limited, and the closing process may not be possible. Sufficient, there is a big gap with the actual situation

In addition, under the action of reciprocating loads such as earthquakes and high water pressure, the cracks will close after cracking. Due to the decrease in structural strength, the closing process must be faster than the opening process of the cracks, which has not been realized in the existing research.

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