Manufacturing method for penetration-type crack of large-size concrete block

Abstract

The invention discloses a manufacturing method for a penetration-type crack of a large-size concrete block. A key point of the method is as follows: firstly pouring a concrete block to be pressed, andbreaking the concrete block, replacing a section of the broken concrete block in a mould and forming a first-pouring concrete block, pouring concrete into an empty part remained in the mould, forminga later-pouring concrete block, finally breaking the concrete block by using a construction gap between two parties, re-closing under the action of a guiding pipe, and forming the penetration-type crack. The manufacturing method for the penetration-type crack of the large-size concrete block is capable of successfully separating the large-size concrete block and splicing two sections exactly after separating.

Description

technical field The invention relates to the field of repairing reinforced concrete structures, in particular to a method for manufacturing penetrating cracks in large-sized concrete blocks. The large size means that the cross-section of the concrete block exceeds 30cm╳30cm. Background technique During the service process of concrete materials, due to various internal and external factors such as plastic shrinkage, dry shrinkage, structural deformation, and external loads, structural joints and non-structural joints will occur. In order to prevent cracks from endangering the safety, durability and normal use of the structure, it is necessary to fill in mortar, resin and other materials in time to repair the cracks. However, after the crack is repaired, whether the poured mortar reaches the deepest position of the crack, what is the specific depth of the mortar repair, and what is the effect of the crack repair? A new research topic and research direction, that is, modeling,...

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Problems solved by technology

At present, there is no equipment and method for making cracks in the industry, but the researchers put forward two ideas: one is the shrinkage method, that is, the concrete block is suddenly cooled and heated to make it expand and contract to form cracks, but the above scheme can only be used in Shallow local cracks are formed on the surface of the concrete structure, which cannot penetrate the concrete block; the second is to use pressurization equipment to place the two ends of the concrete block in the air, and press down the suspended section in the middle of the concrete block to forcibly break it into Two sections, and then rejoin the two sections to make them close together to form a penetrating crack. The disadvantage of the above method is that the two sections of concrete after crushing are no longer on the same straight line. In actual operation, it is difficult to separate the two sections. The sections are completely aligned, so the actual joining process is difficult; more importantly, it breaks the concrete along the width direction and needs to rejoin the sections along the length direction. Hard pressing in the width direction will definitely cause two sections to occur along the width direction. The deformation makes the concave-convex particles of the two sections no longer coincide. In this way, it is difficult or even impossible to reassemble the two sections along the length direction, and naturally no penetrating cracks can be produced.

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