A test device and method for water penetration resistance of concrete joints without lateral restraint

Abstract

The invention discloses a test device and method for water penetration resistance of concrete joints without lateral restraint force. The upper opening of the cylinder has an outer flange, and the lower part of the square cylinder is provided with an inner flange with a middle opening. The inner flange separates the square cylinder into two parts: the test block compartment and the water inlet compartment; the inner flange is provided with an elastic sealing gasket; The left and right cover plates are pressed and fixed on the outer flange of the square tube by fastening bolts; the water inlet cabin at the bottom of the square tube is connected to the water inlet and the hydraulic device, and connected to the water pressure gauge; the left and right cover plates are connected according to The shape and area of ​​the concrete joints are provided with observation ports for easy observation of water seepage. The invention can realize the anti-water penetration performance test of the new and old concrete joints under the action of no lateral restraint force.

Description

technical field [0001] The invention relates to a test device for the water penetration resistance of the joints of new and old concrete structures caused by construction intervals. Background technique [0002] In the civil engineering industry, there are parts where there are joints in the concrete structure due to the construction interval, such as the concrete joints and post-casting strips in the basement, the subway station structure with a laminated wall structure, and the joints of the fabricated underground structure Parts, concrete stubble parts of underground passages, post-repair parts of other engineering structures, etc. When these engineering structures are located below the groundwater level, these joints are often the places where the leakage is relatively concentrated during the operation and use stage, which has a great impact on the later use of the structure and the durability of the concrete, and will also cause certain damage. In serious cases, it may...

AI Technical Summary

Problems solved by technology

The main problem of using this method is: in order to prevent the concrete test block from being pushed out by the water pressure, the steel sleeve on the concrete impermeability instrument is a round table (small at the top and large at the bottom), so when installing the concrete impermeability test block and In the process of adding water pressure from the bottom, a hoop constraint will be formed between the concrete impermeability test block and the steel sleeve, which will increase the extrusion force between the new and old concrete, resulting in different degrees of closure of the joints, which cannot reflect The impermeability of the joints under actual working conditions

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