JPS6245379B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing water leakage in concrete slabs in buildings.

In general, concrete slabs are made by forming a waterproof layer of asphalt, rubber sheet, etc. on the surface of the concrete body, and a finishing layer of mortar on the surface, because the waterproof layer is made of a different material that is difficult to adapt to concrete. The upper and lower surfaces of the waterproof layer are likely to float, and cracks are likely to occur internally due to shrinkage of the mortar and concrete.As a result, rainwater that has entered through cracks on the mortar surface or peeled-off parts of the mortar joints will be absorbed into the finished layer. The cracks flow into the upper floating part of the waterproof layer through the cracks in the waterproof layer, and then enter the lower floating part through peeling or breakage points of the waterproof layer seams, and then move to cracks in the concrete body and reach the bottom surface of the concrete body. Water leaks from. As a result, water leaked from places unrelated to the flooded area, and it was virtually impossible to detect the source of the water leak from the leak. It was waterproofed. but,
In this case, if there is a flooded area within the area where waterproofing has been applied, the water leakage will be stopped, but if it is outside the area, it cannot be stopped, so currently waterproofing is applied over a very wide area. are giving. However, with this method, unnecessary parts were waterproofed, resulting in a large waste of materials and labor.

Therefore, the present applicant focused on the process of water movement from the flooded area to the leaking area, and found that water leakage could be completely prevented by blocking cracks and floating parts along the way.Based on this principle, the applicant Developed a method for repairing water leaks in slabs (Patent application No. 52-53834)
issue). This invention attempts to form a slit to surround the water leakage point, fill this slit with a waterproof repair material to form a waterproof enclosure, and use this waterproof enclosure to block cracks, etc. that serve as water flow paths. However, this method requires a lot of effort to form the slit, and even if you insert a nozzle such as a piston pump into the slit and try to press the repair material into the slit, the repair material will not reach the opening area of the slit. It was found that although it was possible to fill only the slits, it was completely impossible to fill cracks or floating parts that extended from the slits because of the large size. In other words, this method attempts to form a waterproof enclosure surrounding the leakage area to block water from entering from outside the enclosure, and does not attempt to fill repair materials into cracks or the like within the enclosure. If there are flooded areas, it is impossible to prevent water leakage. Furthermore, since this waterproof enclosure is formed only on the finishing layer above the waterproof layer, there is a drawback that water moving through the floating portion below the waterproof layer cannot be blocked at all.

In view of these points, the present invention further improves the above-mentioned invention and aims to obtain a more complete water leakage repair effect. A large number of small holes are drilled at intervals through the waterproof layer, and the pump nozzle is inserted into these small holes to fill the cracks, floating parts, etc. that are occurring inside the small holes and towards the leakage area. This is an attempt to prevent water leakage by filling the repair material deeply. That is, when a pump nozzle is inserted into a small hole and the repair material is forced in by pump pressure, the pressed repair material has no place to escape, so strong pressure is applied and it is sufficiently filled into cracks and floating parts. Therefore, a small area of ^1m2 or less is usually sufficient for repair.
Moreover, the small hole can be easily drilled with a drill, and unlike the case of using a small gap, it can be safely drilled to a depth that reaches the slab body, making the drilling work easy. Unlike the case where a gap is formed surrounding the gap and filled with repair material, water leakage prevention treatment can be performed with a small amount of materials and labor. In particular, since the small holes are drilled at intervals, the strength of the concrete slab itself will not be reduced even if the holes are deep enough to penetrate the waterproof layer. Since it can also be filled with repair material, it is possible to block all gaps leading to water leakage points and perform complete water leakage prevention treatment.

Especially in this method, when the small holes drilled at intervals are connected to each other by a floating part or crack at the bottom, the repair material press-fitted into the floating part from one small hole Since the repair material flows into the adjacent small hole and comes out, it is possible to confirm that the repair material has been sufficiently filled into the floating part in that area, and also to omit filling the raised small hole. This has the effect of allowing efficient repair work to be carried out.

If water leaks from multiple locations in the concrete slab, this method does not necessarily involve drilling small holes at intervals around the leakage location, but instead drills the holes at intervals in a grid pattern. By press-fitting repair material into the area, water leaks can be stopped at multiple locations. Additionally, since the repair material used in this method contains water in the gaps within the concrete slab, it hardens in a sealed state due to a hydration reaction.
In addition, materials that do not shrink upon curing, are waterproof, and have adhesive properties with concrete and waterproof layers, such as mixtures of cement and synthetic resin emulsion or commercially available two-component epoxy. type resin is most suitable.

Next, an embodiment of the water leakage repair method according to the present invention will be described with reference to the drawings.

Example 1 As shown in Figures 1 and 2, at a position approximately 1 m away from water leakage point 1 of concrete slab A,
Using a drill, small holes 4 with a diameter of 9 mm are drilled at intervals of about 100 to 500 mm to penetrate the waterproof layer 2 and reach the slab body 3 so as to surround this water leakage point, and the piston is inserted into the small holes 4. When the nozzle of the type pump is inserted and the repair material 5 is press-fitted, the repair material 5 is fed into the crack 6 and the floating part 7, and is also fed into the adjacent small hole 4 which communicates with the crack 6 and the floating part 7. At this point, stop the press-fitting and make a new small hole 4.
The repair material 5 is press-fitted into the hole, and the repair material 5 is sequentially filled.

As the repair material 5 in this case, a mixture of cement and synthetic resin emulsion was used as described above. Since the hardening of both is rapidly promoted, even the cracks 6 and the gaps between the floating portions 7 in a sealed state are completely hardened and water movement is prevented. Therefore, even if the location of the water intrusion in the finishing layer 8 was unknown and repair of this location was impossible, water leakage could be stopped.

Note that 9 in the figure is a broken portion of the waterproof layer 2.

Example 2 As shown in Figures 3 and 4, small holes 4 with a diameter of 9 mm are bored at intervals along the grid-like joints 10 of the finishing layer 8 in the concrete slab A. A repair material 5 was press-fitted into the hole 4 in the same manner as in the previous example.

As a result, in order to block the crack leading from the water inundation point 11 formed at the joint 10 to the water leakage point 1, and the gap between the floating parts 7 near the joint 10, and to prevent the movement of water to the water leakage point 1, The leakage has completely stopped.

In both of the above embodiments, if the flooded area is obvious, it goes without saying that it is better to apply a waterproof coating such as mortar, asphalt, etc. to the flooded area in addition to the above-mentioned treatment, or to perform a sheet waterproofing treatment.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the method according to the present invention, Fig. 2 is an enlarged vertical sectional view of the same, Fig. 3 is a plan view showing another embodiment, and Fig. 4 is an enlarged longitudinal sectional view of the same. . A...Concrete slab, 1...Water leakage point, 2...
Waterproof layer, 3...Slab body, 4...Small hole, 5...Repair material, 6...Crack, 7...Floating part, 8...Finishing layer, 9...Broken part of waterproof layer, 10...Joint, 11...Flooded area.

Claims (1)

[Claims] 1. In a concrete slab formed by forming a waterproof layer on the slab body and a finishing layer on top of the waterproof layer, there are a number of small holes penetrating the waterproof layer from the surface of the finishing layer to surround the leakage point on the lower surface of the slab body. By drilling holes at intervals, fitting the pump nozzle into the small holes, and press-fitting a waterproof repair material into the cracks, floating parts, etc. that lead to the small holes and the leakage area. A concrete slab water leakage repair method characterized by preventing water leakage.