JPH09287161A - Water cutoff material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cutoff material which is not easily affected by recurrence of a leakage condition. SOLUTION: This material is such that a water cutoff part 5 is formed in a part which has reacted with water and an unaffected part 6 which has not reacted with water yet is formed in a part having the water cutoff part 5 in-between. Even if water breaks the cutoff part 5 when external force acts on a leaking part such as a crack, the material in the unaffected part 6 reacts with water and exhibits a water cutoff effect. The water cutoff effect continues until the unaffected part 6 is exhausted.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a waterproof material.

[0002]

2. Description of the Related Art When a wall of a concrete structure buried in the ground is cracked, if water such as groundwater exists in the buried place, the water will pass through the crack to the inside of the structure. Water may get in. In order to prevent such water leakage, it is preferable to use a water blocking material.

For this purpose, conventionally, urethane-based water blocking materials are often used, and one of the urethane-based water blocking materials is supplied under the trade name "OH1A". . This "OH1A" uses water as a hardening material, and it becomes possible to stop water by sufficiently absorbing and swelling water.

[0004]

However, this "OH1
When "A" is injected into the portion where water should be stopped, its surface first reacts with water, but because it is hydrophilic, water passes through the reaction portion and the unreacted portion reacts sequentially, Everything reacts at once. Therefore, if external force acts again on the water leakage part such as a crack and the reaction part collapses,
There is a problem that the water leakage state will recur.

Further, as described above, the water can be stopped only when the water is sufficiently absorbed and swollen, and when the water is withdrawn, the material is suddenly changed, and a shrinkage phenomenon called "thinning" occurs. There is a problem that water leakage will start again. Therefore, in that case, it is necessary to carry out repair work after the work is completed.

[0006] Therefore, an object of the present invention is to solve the above problems and to provide a water blocking material which is unlikely to cause a recurrence of a water leakage state.

[0007]

In order to achieve this object, the present invention provides that a water-stop portion is formed in a portion that has reacted with water, and that the portion with the water-stop portion interposed still reacts with water. The non-reacted portion is formed so as not to be formed.

With such a structure, since the unreacted portion which has not yet reacted with water is formed in the portion where the water blocking portion is interposed, the external force acts again on the water leakage portion such as cracks. Then, even if water breaks the water stop,
The material of the subsequent unreacted portion reacts with water to exert a water blocking effect. This water-stopping effect continues until the unreacted part disappears.

Further, according to the present invention, a semi-impermeable layer is formed between the water blocking portion formed by the reaction with water and the unreacted portion,
Do not let water infiltrate into the unreacted part from the water shut off part. Therefore, this unreacted part does not react at one time, and therefore, even if water is withered, it does not shrink significantly. When the water breaks the water stop portion, the unreacted portion reacts with water for the first time at that time to become the water stop portion. Therefore, after the construction, even if external force acts again on this construction part, no special repair work is required,
You can leave it alone.

[0010]

EXAMPLES The water blocking material of the present invention can be obtained, for example, by mixing fats and oils with a urethane type water blocking material.
Specifically, for example, as described above, the urethane water-stopping material supplied under the trade name "OH1A" and the engine oil supplied under the trade name "Mobile Multi Grade 7.5W-30" are used. It is preferable to mix these in an appropriate ratio.

This "OH1A" has, as a typical property,
It is a colorless to pale yellow liquid with a specific gravity of 1.08 and 2.
Viscosity at 0 ° C is 350 cps, curing time at 20 ° C when the OH1A / water mixture ratio (volume ratio) is 10/90 is 4 minutes, and it has the characteristics of a highly elastic gel. -Used for purposes such as preventing water leakage.

"Mobile Multi Grade 7.5W-3
"0" has a typical SAE viscosity of 7.5 W-3.
0, API service is SF equivalent, specific gravity is 0.87
6. Hue is dark green, pour point is -35 ° C, viscosity at 40 ° C is 66.7cSt, and viscosity at 100 ° C is 1
It has a viscosity index of 0.9 cSt, a viscosity index of 149, a sulfated ash of 0.77% by weight, and an alkali number of 6.1 mgKOH / g.

The water-blocking material of the present invention can be obtained by mixing "OH1A" and "Mobile Multigrade 7.5W-30" in an appropriate ratio, but by changing the mixing ratio, The water blocking material can have a desired specific gravity. For example, for 1 liter of "OH1A", 1 to "Mobile Multigrade 7.5W-30"
By mixing about 0.4 liter, a water blocking material having a small specific gravity and suitable for use on the water surface can be obtained. On the contrary, by mixing 0.4 liters or less of "Mobile Multi Grade 7.5W-30" with 1 liter of "OH1A", it is possible to obtain a water blocking material suitable for underwater use. it can.

The water blocking material of the present invention can be injected into the water leak portion by a so-called pressure pneumatic method. In other words, if water is leaking from the crack and water is flowing outside the crack, it is usually difficult to inject the waterproof material. It can be closed, pressurized air can be injected into this closed portion to discharge the water, and then the water blocking material can be injected in the state where the water is exhausted.

FIG. 1 shows that a crack 3 is generated in a concrete wall 2 of a concrete structure 1 buried in the ground,
When water leaks from the outside of the structure 1 to the inside of the structure 1 through the crack 3, a state in which the water blocking material 4 of the present invention is injected into the ground outside the wall 2 by a pneumatic method is shown. The water blocking material 4 is injected while being attached to the surface of the concrete wall 2. Then, this injection reacts with water to form the water stop portion 5 formed of a non-returned water film on the outside. In addition, the unreacted portion 6 that has not yet reacted with water inside the water blocking portion 5
Is stable in the wrapped state. When this pneumatic method is adopted, water is flooded around the water blocking material 4 after 10 to 20 minutes have passed after the injection.

The waterproof material 4 injected by the pneumatic method is
Eventually, it becomes a uniform rubber, but the time required until then is 50 hours when 1 to 0.6 liters of "Mobile Multigrade 7.5W-30" is mixed with 1 liter of "OH1A". That is all. In contrast, for example, when 0.4 liter of "Mobile Multigrade 7.5W-30" is mixed with 1 liter of "OH1A", it takes 40 hours or more. Similarly, when 0.3 liter is mixed, it takes 30 hours or more, and when 0.2 liter is mixed, it takes 10 hours or more.

FIG. 2 illustrates an example in which a water blocking material is injected by the so-called V-cut method. Here, the inner surface of the concrete wall 2 in which the crack 3 has occurred is cut into a V-shaped cross section, and the cut portion 7 is injected so as to be filled with the water blocking material 4. At the crack 3 in the cut portion 7 and in the vicinity thereof, the water blocking material 4 reacts with water to form a water blocking portion 5, and an unreacted portion 6 is formed at a position where the water blocking portion 5 is interposed.

Table 1 shows the case where the water blocking material of the present invention is used,
A comparison of the characteristics when "OH1A" is used alone is shown.

[0019]

[Table 1]

As is clear from Table 1, the water blocking material of the present invention can be made into a water blocking material having completely different properties from the original "OH1A" simply by mixing "OH1A" with engine oil. It was possible to improve the characteristics remarkably compared with the original "OH1A". In addition, there was no negative impact on the environment.

When "OH1A" was used, the skeleton was broken when a large amount was injected or when the hose was injected into the V-cut.

[0022]

As described above, according to the present invention, a water blocking portion is formed in a portion that has reacted with water, and an unreacted portion that has not yet reacted with water is formed in a portion with this water blocking portion interposed. Since the structure is formed, even if external force acts again on the leaked part such as cracks and water breaks the water stop part, the material of the unreacted part that follows it reacts with water and stops. The water effect is exerted, and this water stopping effect can be maintained until the unreacted part is exhausted. Therefore, the required water stopping performance can be maintained for a long period of time, and the recurrence of the leakage condition can be effectively prevented. . In addition, since the water is still impermeable between the water-stop portion and the unreacted portion and water does not penetrate from the water-stop portion to the unreacted portion, the unreacted portion does not react at one time, and therefore the water withers. However, if the water does not shrink significantly and the water breaks the still part, the unreacted part reacts with the water for the first time to become the still part at that point, so after the construction, external force acts again on this part. Even in such a case, there is an advantage that no repair work is required and it can be left as it is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a water blocking material of the present invention is injected by a pneumatic method.

FIG. 2 is a cross-sectional view showing a state where the water blocking material of the present invention is injected by the V-cut method.

[Explanation of symbols]

 4 Water blocking material 5 Water blocking part 6 Unreacted part

Claims (1)

[Claims] 1. A water blocking portion is formed in a portion that has reacted with water, and an unreacted portion that has not yet reacted with water is formed in a portion with the water blocking portion interposed therebetween. Water stopping material.