A method for bonding new and old concrete interfaces with planted bars

Abstract

The invention discloses a method for bonding new and old concrete interfaces by means of planting bars. The method includes steps of (1), checking the quality of a base material concrete, and carrying out roughening treatment on the surfaces of the base material concrete with the strength grade not lower than C20; (2), carrying out bar planting construction, including line snapping positioning, hole drilling, hole cleaning, glue injecting, bar planting and acceptance checking, on the base material concrete with the surfaces which are already subjected to roughening treatment; (3), pouring new concrete. The method has the advantages that parameters of the distance between the centers of every two adjacent planted bars, the anchoring depths of the planted bars, the distances from the edges of bar planting locations to the edges of the base material concrete, the relations between the diameters of drilled holes and the diameters of the planted bars and the like are reasonably optimized, and accordingly the purposes of enhancing the new and old concrete bonding strength, improving the stress performance, constraining relative displacement of the new and old concrete interfaces, enhancing the anti-shear ability, effectively controlling damage such as rutting, upheaval and reflection crack of the new concrete and prolonging the service lives can be achieved.

Description

technical field [0001] The invention relates to the field of reinforcement and maintenance of cement concrete pavement, in particular to a method for bonding new and old concrete interfaces by planting bars. Background technique [0002] In recent years, concrete has been widely used in civil engineering and road engineering because of its excellent engineering properties. Under the influence of natural environment and human activities, a large number of concrete structures around the world experience varying degrees of aging and damage every year; especially in my country, concrete structures are widely used. Due to improper design, construction and maintenance, even newly-built concrete structures , There will also be diseases such as honeycombs, cavities, cracks and even collapses, which will seriously affect the normal use of the structure and greatly shorten the service life of the structure. The survey shows that the bonding strength of the concrete bonding surface wil...

AI Technical Summary

Problems solved by technology

However, there is no established calculation theory and construction specification for the method of strengthening the joint surface of new and old concrete by planting bars

There are many factors affecting the mechanical connection performance of steel bars, and the quantitative analysis of each factor on the performance is particularly rare, which limits the practical use of mechanical connection parts for steel bars to a certain extent.

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