New-old concrete combining construction method at local repair section

Abstract

The invention relates to a new-old concrete combining construction method at a local repair section. The construction method comprises the following steps of: (1) old concrete grooving: sawing joints on the old concrete on one side of a combination surface by a joint saw and uniformly arranging grooves at equal intervals; (2) groove cleaning: cleaning away the concrete within a grooving range in the step (1) by using impacting equipment and manually chiseling away edge-corner areas to form flat groove bottoms; (3) combination surface scabbling: scabbling the cutting surface of the middle and old concrete in the step (1); (4) interfacial agent spraying: spraying an interfacial binding agent on the combination surface of the new-old concrete; (5) steel bar laying: laying steel bars or steel bar supports in the grooves arranged in the step (1); and (6) new concrete pouring: pouring the new concrete inside the erected steel bar supports and the grooves. The new-old concrete combining construction method provided by the invention is simple in construction method and flexible in technological operation, can enable the new and old concrete at the local repair section to be closely combined, is durable and stable, and is widely applicable to new-old concrete engineering practice at the local repair section.

Description

technical field [0001] The invention belongs to the field of concrete construction, and in particular relates to a construction method for combining new and old concrete in a partial repair section. Background technique [0002] Combination of new and old concrete Construction is a common problem in concrete construction, especially in the partial repair of concrete, the combination of new and old concrete is more common. The strength of the combination layer of new and old concrete not only involves the layering, block pouring, superimposed beam and slab structural design of large volume concrete, but also has important implications for the maintenance and reinforcement of a large number of currently damaged concrete buildings. its important practical significance. If the treatment is not good, the following problems often appear in the joint part: the new and old concrete cannot be combined to bear the force; the temperature shrinkage of the new concrete and the cracks of...

AI Technical Summary

Problems solved by technology

If the treatment is not good, the following problems often occur at the joint part: the new and old concrete cannot be combined to bear the force; the temperature shrinkage of the new concrete and the old concrete will cause cracks, and subsequent diseases will occur with the infiltration of water

The first method effectively eliminates the possibility of the above-mentioned hazards, but undoubtedly causes waste and increases the construction cost, and the latter method loses its use in the local repair section due to site restrictions.