Plastic micro packer and construction method using it

Abstract

Disclosed are a plastic micro packer for repairing cracks of structure and a method for repairing middle or low pressure cracks using the plastic micro packer: The micro packer is connected to a hole formed in a crack to inject, repairing solution into the crack of a concrete structure, and includes: a hollow rubber sleeve having a screw portion formed on the inner surface thereof; a hollow packer body having a screw coupling portion screwed with the screw portion and a nozzle portion connected to a repairing solution injector; and a cove; member connected to the nozzle portion to prevent leakage of repairing solution. The screw portion of the rubber sleeve has a wide top and a narrow bottom, and thereby, is closely contacted to the hole while the lower portion of the screw portion is expanded in a radial direction when the screw: coupling portion is screwed with the screw portion. A flange portion is formed at the front end of the rubber sleeve to prevent excessive induction of the rubber sleeve into the hole.

Description

TECHNICAL FIELD [0001] The present invention relates to a plastic micro packer and a middle- or low-pressure crack repairing method using the same, and more particularly, to a plastic micro packer and a middle- or low-pressure crack repairing method using the same, which have a simple and improved structure to allow economical construction. BACKGROUND ART [0002] In general, cracks may occur in the outside or the inside of concrete structures or buildings due to various causes, i.e., dry contraction, temperature change, water leakage or others. Furthermore, in places where lots of loads are applied, such as floors of underground parking lots, or in places where waterproofing layer and finishing concrete layer of general floor slabs are constructed weakly, the finished concrete layers often come off even though they are not exposed to the outside of the structure or building. Most of cracks caused by normal dry contraction of concrete do not have any influence on the structure or buil...

AI Technical Summary

Benefits of technology

The present invention provides a plastic micro packer and a middle- or low-pressure crack repairing method using the same. The plastic micro packer has a simple structure and is convenient to construct. It can be used even on edged portions of a structure, which are difficult to repair. The plastic micro packer prevents stop of cracks caused by pulverized concrete powder and allows construction even if the holes for inserting the packer are shallow. The plastic micro packer can be easily connected to a hole in a crack and a repairing solution can be smoothly injected. The method includes steps of forming holes in cracks of a concrete structure, drilling deeper holes, cutting and cleaning pulverized concrete powder, connecting a rubber sleeve to the inner surface of the hole, connecting a packer body to the rubber sleeve, injecting the repairing solution into the crack, stopping the nozzle, and cutting and finishing the packer body and rubber slee. The method also includes steps of mounting check windows and sealing cracks to prevent leakage of the repairing solution.

Problems solved by technology

In general, cracks may occur in the outside or the inside of concrete structures or buildings due to various causes, i.e., dry contraction, temperature change, water leakage or others.

Furthermore, in places where lots of loads are applied, such as floors of underground parking lots, or in places where waterproofing layer and finishing concrete layer of general floor slabs are constructed weakly, the finished concrete layers often come off even though they are not exposed to the outside of the structure or building.

Most of cracks caused by normal dry contraction of concrete do not have any influence on the structure or building, but cracks occurring by excessive dry contraction or other causes may have severely bad influences on the structure or building.

Water and air may enter the cracks and the come-off portions of the structure or building, and the water and air entering facilitate efflorescence of concrete of the structure or building and incur corrosion of reinforcing rods, and thereby life of the structure or building is reduced and safety is deteriorated.

However, the conventional packer has a complex structure because of a check valve 1 for preventing backflow of the repairing solution.

Furthermore, work is difficult and inconvenient because tightening force generated when the worker rotates the injection member 2 expands the sleeve 5.

Moreover, because the sleeve 5 expanded after the worker rotates the injection member 2 is contacted to the crack, the contact level or force is imperfect.

As a result, the conventional packer is not economical due to an excessive working period of time.

Additionally, if the crack formed in the hole where high pressure acts is filled with pulverized powder generated during the perforation by a drill, repairing solution provided by the packer cannot be injected smoothly, and excessive pressure is loaded inside the hole, and thereby, the concrete structure or building can be destroyed.

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