JPS5851113B2 - How to repair cracks in concrete, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing cracks occurring in structures made of concrete, stone, etc.

Traditionally, cracks that occurred in concrete, etc.
All of them were repaired using the so-called ■ cut method disclosed in No. 10420.

This V-cut method requires troublesome repair work and cannot be expected to produce a beautiful finish, so it is recommended for narrow cracks.
Recently, a method of directly injecting repair fluid into cracks has been used.

As this direct press-fitting method, as described in Japanese Patent Publication No. 10573/1986, adhesive tape is pasted at regular intervals across the crack, the crack is covered with a sealant, leaving the exposed part of the tape, and then the tape is applied. A method is disclosed in which a repair liquid is filled into the crack after peeling off, setting an injection port, providing an elastic tip at the tip of the nozzle of a repair liquid filling machine and pressing it against the injection port.

However, with this method, when the tape is peeled off to form the injection port, it is not always possible to reliably peel off the seal part by the width of the tape, and a gap may occur between the elastic product port and the seal part or crack surface. In addition, if the crack surface is a rough surface with severe irregularities, a gap will be created between the elastic layer and the crack surface.

Furthermore, one worker must communicate with a thin crack that is the liquid opening of the elastic material in a state that cannot be visually recognized, and it is often impossible to communicate with the thin crack.

If filling of the repair liquid is started in such a state, the repair liquid may leak or collect and solidify only at the entrance of the crack, making it impossible to expect a complete repair.

In addition, according to Japanese Patent Publication No. 52-25020, tapes made of paraffin or synthetic resin are pasted on the cracks at small intervals, and connecting pieces made of paraffin or synthetic resin have a hole in the center. A method is disclosed in which a repair liquid is pasted onto the above-mentioned small-spaced cracks and a repair liquid is injected into the cracks through the holes.

However, even with this method, there is a difference in level between the tape and the wall surface, and it is not possible to prevent a gap from forming between the end of the tape and the connecting piece, and the wall surface is rough and uneven. In some cases, the tape or connecting pieces may not be properly attached9.
It cannot be denied that gaps will occur.

Therefore, the repair liquid leaks, causing a lack of pressure, and the repair liquid does not reach the deep part of the crack until it hardens, making it impossible to expect a complete repair even with this method.

In addition, with paraffin tapes and connecting pieces, the adhesive surface is melted by heating, so although the above problem can be solved to some extent in theory, conversely, the melted paraffin also blocks the injection port 1. Moreover, since the wall surface of the retardant exposed to the hot sun is heated to such a high temperature, paraffin tapes and connecting pieces cannot be used because they will melt.

An object of the present invention is to correct the shortcomings of the direct press-fit repair method and to prevent repair fluid from leaking.

In order to solve this technical problem, the present invention.

After sealing 2 by applying a sealing material made of synthetic resin or inorganic material over the crack 1, holes 3 are bored at appropriate intervals in the seal 2 over the crack 1, and the hole 5 is formed using an elastic material. The pad 4 is pasted on the seal 2 to make the hole 3 of the seal communicate with the hole 5 of the pad, and then the nozzle 6 of the repair liquid filling machine is pressed against the pad 4, and the repair liquid is poured into the crack 1 from the hole 5 of the pad. The technical means is to fill the

According to this technical means, since the pad is pasted on top of the seal on the crack, even if the crack surface is uneven, a smooth surface is formed by the sealant and the pad 4 and the seal 2 are bonded together. Adhesion can be performed reliably, and the sealing effect is also sufficient.

Furthermore, as a result of adhering the pad 4 to a smooth surface, no unevenness occurs on the surface of the pad 4, and as shown in FIG. There will be no leakage of the repair liquid from the crack, and sufficient injection pressure can be applied to completely fill the repair liquid into the crack.

To make a hole in the seal, once the seal has hardened, use a knife, screwdriver, etc. to peel or scrape the seal, or punch a hole in the seal with a cone-shaped object. good.

Further, the pad is preferably made of soft rubber or synthetic resin, nonwoven fabric through which the repair liquid does not pass, or the like.

When filling with repair fluid, usually multiple pads are pasted,
For cracks on a flat surface, fill with repair liquid from the edge, and for cracks on an elevation, fill from the bottom.

As shown in FIG. 1, first, the nozzle 6 is brought into pressure contact with the pad 44a and the repair liquid is filled. At this time, the other pad 4b is
, 4c serve as an exhaust hole.

) When the liquid reaches the next pad 4b, filling is stopped and the hole 5 of the pad 4a is closed with adhesive tape or the like.

Next, the nozzle 6 is brought into pressure contact with the pad 4b to fill the repair liquid, and the same procedure is repeated nine times. When the repair liquid has hardened, the 7-rule 2 and the pad 4 are removed, and the repair work is completed.

Incidentally, if the crack is short, one pad may be attached and one end of the crack may be filled with the repair liquid without being sealed so that it can be evacuated.

Figures 3 to 6 show that by changing the shape of the nozzle tip,
This makes the contact area between the nozzle and the pad more airtight.

FIG. 3 shows that a tapered portion 12 is provided at the tip of the nozzle 11, and when the nozzle 11 is pressed against the pad 4, the tip 13 of the nozzle enters the hole 5 of the pad, and the tapered portion 12 is inserted into the hole 5. It will be in close contact with the upper edge of.

FIG. 4 shows a knife 16 on the outer periphery of the tip of the nozzle 15.
When the nozzle 15 is brought into pressure contact with the pad 4, the knife 16 strongly presses the pad 4, and the two come into close contact with each other.

In FIG. 5, a step part 22 is formed on the tip surface of the nozzle 21, a protrusion part 23 is provided in the center of the step part 22, and the liquid flow path is exposed.
1 is pressed against the pad 4, the stepped portion 22 and the outer peripheral portion 24 of the protrusion come into close contact with the pad.

In this case, it is desirable that the outer diameter of the outer peripheral portion 24 be the same as or slightly larger than the inner diameter of the hole 5 of the pad.

In FIG. 6, a convex portion 31 is formed at the center of a pad 30, and a concave portion 33 is formed at the tip of a nozzle 32.

When the nozzle 32 is pressed against the pad 30, the two fit together at the uneven portions and come into close contact with each other.

In this case, it is desirable that the outer diameter of the convex portion 31 be the same as or slightly larger than the inner diameter of the concave portion 33 of the nozzle.

Furthermore, in this case, the outer periphery of the convex portion 31 and the inner periphery of the recessed portion 33 may be tapered to fit together.

Even in these cases, the same effect as shown in FIG. 2 can be obtained. In particular, in the embodiments shown in FIGS. 3, 5, and 6, the liquid flow path of the nozzle Since the pad and the hole in the pad communicate completely, repair work becomes easier.

[Brief explanation of the drawing]

Figure 1 is a plan view when filling a crack with repair liquid, Figure 2
The figure is a cross-sectional view of the nozzle in pressure contact with the A-A' section in Figure 1, and Figures 3, 4, 5, and 6 are in other embodiments in which the nozzle is in pressure contact with the pad. FIG. 1...Crack, 2...Seal, 3.
...hole, 4...pad, 5...
Hole, 6...nozzle.

Claims (1)

[Claims] 1 After sealing the crack by applying a sealant made of synthetic resin or inorganic material, holes are made at appropriate intervals in the seal over the crack, and a pad made of an elastic material with the holes formed is placed on the seal. Crack repair in concrete, etc., characterized by pasting the seal and communicating the hole in the pad with the hole in the pad, and then applying pressure to the pad with the nozzle of a repair liquid filling machine to fill the crack with repair liquid through the hole in the pad. Method.