JP3760012B2 - Water stop method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for stopping a water leakage point, in particular, maintaining a sufficient water stoppage even when the water pressure of the water leakage is high and the amount of water leakage is large, and even if the water leaks only at the water leakage point, the water leakage does not occur. The purpose is to provide a water stop method that does not occur.
[0002]
[Prior art]
Conventionally, as a method for stopping water leakage from a large crack such as a jumper portion formed in a frame made of concrete or the like, the following methods are known. First, in a state where a plurality of vinyl tubes are inserted into the water leakage location, the periphery of these tubes is covered with quick setting cement so that the water leaks out through the tube. Next, one of the plurality of tubes is left and the others are mechanically sealed one after another, and a water-stopping agent is injected into the unsealed tube at a high pressure and cured instantaneously. And stop the water.
[0003]
[Problems to be solved by the invention]
However, the conventional water stop method has the following problems. When the water stoppage is performed by the above method, the strength of the water stop portion is not sufficient. Therefore, when the water pressure of the water leak is high, the water stop portion may be damaged by the water pressure and the water leak may occur again. Further, when the amount of water leakage is very large, the above-described method cannot be applied, and the water stoppage is practically difficult.
In addition, when the temperature of the enclosure fluctuates due to changes in temperature, etc., the enclosure may expand and contract, causing the interval between leaked points to expand or narrow, resulting in damage to the water stop and re-leakage. .
The present invention has been made in view of the above circumstances, and maintains sufficient water stoppage even when the water leakage pressure is high and the amount of water leakage is large, and water leakage occurs even when the water leakage location is expanded or narrowed. The purpose is to provide a water stop method that does not occur.
[0004]
[Means for Solving the Problems]
The problem is that the porous body sheet communicating with the outer surface so as to cover the water leakage location is applied to the water leakage location of the housing, and the plate body extending over almost the entire surface of the porous material sheet is arranged on the plate. The problem is solved by a water-stop construction method in which the body is fixed to the housing, a hydrophilic polymerization-curing liquid water-stopping agent is injected from an injection port provided in the plate body, and the porous sheet is impregnated.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of the water stop construction method of the present invention will be described with reference to FIG.
In the figure, reference numeral 1 denotes a casing made of concrete or the like, and reference numeral 2 denotes a jumper portion that serves as a water leaking portion of the casing 1. The junker portion is a portion where the concrete is not sufficiently filled when the concrete is placed, and a portion remains as a void, and water enters from the outside through this portion.
[0006]
In the method of this example, first, a plurality of bolts 3 are fixed around the junker portion 2 on the side of the leaked water of the housing 1 so as to protrude substantially perpendicularly to the wall surface of the housing 1.
Next, the porous body sheet 4 is applied to the housing 1 so as to cover the jumper portion 2. The porous sheet 4 is made of a porous body that communicates with the outer surface. The porous sheet 4 is pressed against the water-stop portion, holds a hydrophilic liquid water-stop agent therein, and cures there, and has excellent mechanical strength (compressive strength and tensile strength) and stretchability. Also preferred are those that have compression elasticity, excellent durability, and easily penetrated by a hydrophilic liquid waterproofing agent, such as foams with an open cell structure, fiber masses formed by entanglement of relatively hard fibers, etc. Used for.
[0007]
As this porous material, one having a compressive strength (conforming to JIS K6401) of 5 kg / cm ² or more, a tensile strength (conforming to JIS K6301) of 2 kg / cm ² or more, and an elongation (conforming to JIS K6301) of 50% or more is used. It is preferable. If these values are within the above range, the water pressure of the water leakage is high and water can be reliably stopped even when the amount of water leakage is large. Even when the interval between the junkers 2 varies due to the expansion and contraction of the housing 1, It is preferable because re-leakage hardly occurs because it can follow the fluctuation. Specific examples of the porous body include urethane foam and steel wool. Among them, it is particularly preferable to use a urethane foam having no cell membrane.
[0008]
The porous sheet 4 is sufficiently large to completely cover the junker portion 2 and its thickness is appropriately set according to the amount of water leakage, but is preferably 40 to 60 mm. A plurality of insertion holes 4 a for inserting the bolts 3 are formed in the vicinity of the peripheral edge of the porous sheet 4. Moreover, the porous body sheet 4 may be one sheet, and may be laminated and used as about 2 to 10 sheets.
[0009]
Next, the plate body 5 is disposed on the porous body sheet 4. The plate body 5 is for keeping the porous sheet 4 in contact with the housing 1 and is preferably made of a material having high rigidity such as stainless steel or carbon steel. The plate body 5 is sized to cover almost the entire surface of the porous sheet 4, and the thickness is preferably 0.5 to 3 cm. An injection port 5 a for injecting a water-stopping agent is formed in the approximate center of the plate body 5. The inner diameter of the injection port 5a is preferably about 6 to 51 mm (1/4 "to 2"), and a plug 9 can be attached to the injection port 5a via a brushing 7 and a nipple 8. ing. A plurality of insertion holes 5 b for inserting the bolts 3 are formed in the vicinity of the peripheral edge of the plate body 5.
[0010]
Next, a nut or the like is fastened to the bolt 3 to firmly fix the plate body 5 to the housing 1. As a result, the porous sheet 4 is strongly pressed against the housing 1 and is in contact with no gap. At this time, the leaked water leaking from the jumper portion 2 has little resistance, so that most of the leaked water flows out through the inlet 5a, and the peripheral edge of the porous body sheet 4 is strongly pressed against the housing 1 by the plate body 5 so that the water leaks. As a result, only a small part of the leaked water flows out from the peripheral edge of the porous sheet 4. In this state, rapid cement mortar or the like is applied between the peripheral edge of the plate body 5 and the housing 1 to stop the water.
[0011]
Next, a liquid water-stopping agent is injected from an injection port 5 a of the plate body 5 at an injection pressure of 1 to 150 kg / cm ² using a general-purpose injection pump, and impregnated in the porous body sheet 4. After the injection, the injection port 5a is sealed with a blind cap, for example. The water-stopping agent is hydrophilic and is polymerized and cured, that is, contains one or more types of monomers, and has a low viscosity and fluidity before the monomers are polymerized. A type that cures together is suitable. For example, a crosslinkable monomer and a vinyl monomer added with a polymerization catalyst together with water are used, and the vinyl monomer is preferably a hydrophilic vinyl monomer. Examples of hydrophilic vinyl monomers Examples thereof include (meth) acrylic acid and metal salts thereof, vinyl acetate, vinyl alcohol, maleic acid and metal salts thereof, and among these, (meth) acrylic acid metal salts are preferred. Any metal ion forming the (meth) acrylic acid metal salt can be used, but for example, a magnesium salt can be preferably used.
[0012]
As the crosslinkable monomer, a polyfunctional monomer is used, and among these, polyfunctional (meth) acrylates are preferable, and among these (meth) acrylates, one or more are shown as exhibiting relatively high hydrophilicity. Those having (meth) acryloyloxy groups at both ends of the main chain consisting of alkylene glycol are more preferred. Specific examples of such polyfunctional monomers include ethylene glycol di (meth) acrylate and diethylene glycol di (meth). Examples include acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, and polypropylene glycol di (meth) acrylate.
[0013]
After mixing, the crosslinkable monomer and the vinyl monomer are polymerized with a certain curing time to be cured into a hydrous gel state. As a water-stop agent, it is insoluble in water in a cured state, has sufficient stretchability, has water tightness, that is, has a property of swelling when absorbed, and has chemical resistance and bacteria resistance. It is preferable to use a material excellent in heat cycle resistance (−70 to 100 ° C.), acid resistance and alkalinity.
[0014]
As the polymerization catalyst used for the water-stopping agent, it is preferable to use a redox catalyst. As the redox catalyst, for example, a catalyst containing ammonium persulfate, potassium persulfate or the like as an oxidant component and sodium thiosulfate, Rongalite, sodium sulfite, triethanolamine or the like as a reducing agent component can be used. The addition amount of the polymerization catalyst is usually 0.1 to 100 parts by weight with respect to 100 parts by weight of the monomer, and is appropriately selected from the above range so that the curing time of the water-stopping agent is 5 to 60 seconds. It is preferable to set.
[0015]
The compounding ratio of each component in the water-stopping agent is not particularly limited, but is 12 to 24% by weight of a polyfunctional monomer, 8 to 16% by weight of a vinyl monomer, 50 to 70% by weight of water, and a redox catalyst. Examples thereof include an agent A consisting of 10% by weight of the amine component, and an agent obtained by mixing a B agent consisting of 0.5 to 2% by weight of peroxide in an equal weight mixture of ethylene glycol and water just before use.
[0016]
The water-stopping agent separates at least a part of each of the above components from the other components so that the polymerization reaction does not proceed, and these are mixed immediately before use, so that the mixture has not yet undergone the polymerization reaction. While being in a cured state, it is used so as to be injected into the porous sheet 4.
The injected water-stopping agent spreads over the entire porous sheet 4 and reaches the surface of the casing 1 in contact with the porous sheet 4, and is cured in a state in which the junker portion 2 is completely sealed by contacting the surface without any gap. At this time, the water-stopping agent is cured in a state where it is in contact with the housing 1 with almost no adhesion.
[0017]
If the junker part 2 is water-stopped according to the above method, water can be reliably stopped even when the water pressure is high and the amount of water leak is large. That is, when the water leakage pressure is high, for example, 0.5 kg / cm ² or more and the amount of water leakage is large, a force in the direction of water leakage is applied to the porous sheet 4 by the water pressure. Since the plate body 5 having high rigidity is firmly pressed against the housing 1, the water leakage pressure is suppressed here, and the amount of water entering the porous sheet 4 is also reduced. Therefore, the operation of pouring the water-stopping agent into the porous sheet 4 can be easily performed, and re-leakage hardly occurs after the water is stopped.
[0018]
Further, since the water-stopping agent is impregnated into the porous sheet 4 having stretchability and compression elasticity and is not adhered to the casing 1, the temperature of the casing 1 fluctuates due to temperature change or the like, and its length is Even when the gap is slightly changed and the interval between the junker portions 2 is expanded or narrowed, the porous sheet 4 and the water-stopping agent keep the junker portion 2 sealed without breaking.
Further, since the cured product of the water-stopping agent has the property of absorbing water and expanding, it comes into contact with the water leakage and swells by absorbing the water leakage, and comes into contact with the housing 1 more densely. Further enhanced.
[0019]
In the water stop construction method, a highly rigid plate body 5 is disposed on the porous sheet 4 covering the junker portion 2 of the housing 1 and the plate body 5 is fastened to the housing 1. Even when the pressure is high and the amount of water leakage is large, the porous sheet 4 can be kept in contact with the casing 1 without any gaps, the junker portion 2 can be kept sealed, and the water-stopping property can be maintained.
In addition, even when the interval between the junker portions 2 is enlarged or narrowed, the porous sheet 4 can maintain the sealed state of the junker portion 2 and maintain the water-stopping property.
[0020]
【Example】
Hereinafter, specific examples will be shown to further clarify the effects of the present invention.
(Example)
The water stop construction method of the present invention was applied to water leakage from a junker portion of an existing wall body made of reinforced concrete having a length of 20 m, a height of 7 m, and a thickness of 40 cm. In this wall body, one side is a water storage portion, and this surface is always in contact with water. There was a jumper portion with a distance of 100 mm and a length of 20 cm along the length direction at a position corresponding to a water depth of 0.5 m in the water storage portion of this wall, and water leakage occurred constantly from this portion.
[0021]
First, eight bolts were fixed so as to protrude perpendicularly to the wall body around the jumper portion of the leaking side surface of the wall body. Next, six urethane foam sheets, which are rectangular porous sheets having a width of 60 cm, a height of 1 m, and a thickness of 10 mm, are prepared and laminated, and the entire junker portion is completely covered on the wall body. I guessed so. A rectangular stainless steel plate having a width of 60 cm, a height of 1 m, and a thickness of 6 mm was placed on the foam sheet, and the plate was fixed to the wall using the bolts. The plate has an inlet with a diameter of 1/4 "in the center. Next, rapid cement is applied between the peripheral edge of the plate and the wall, and after this portion is stopped, A water-stopping agent was injected from the above-mentioned injection port at an injection pressure of 20 kg / cm ² and impregnated into the entire foam sheet using 25 wt% polyethylene glycol dimethacrylate, magnesium acrylate. Agent A consisting of 10% by weight, 55% by weight of water and 10% by weight of triethanolamine, and Agent B consisting of 49.5% by weight of ethylene glycol, 49.5% by weight of water and 1% by weight of ammonium persulfate The mixture was used.
After the wall body stopped according to the above method was left for one year, it was examined whether or not water leakage occurred.
[0022]
(Comparative example)
Five vinyl tubes are inserted over the same length of the wall of the junker as in the embodiment, and the junker is closed using the quick-setting cement, leaving the tube. After the book was left and the others were folded and sealed, a curable waterproofing agent made of urethane resin was injected into the unsealed tube to close the tube. After leaving the wall stopped in this way for one year, it was examined whether or not water leakage occurred.
[0023]
As a result of the above test, in the wall body water-stopped by the construction method of the comparative example, the water-stop portion was damaged and water leakage occurred, whereas in the wall body water-stopped by the construction method of the example, water leakage occurred. Thus, it was found that good water-stopping property was maintained.
[0024]
【The invention's effect】
As described above, in the water stop construction method of the present invention, the plate body is disposed on the porous sheet covering the leaked portion of the housing, and the plate body is fastened to the housing. Even when the amount of water leakage is large, the porous body sheet can be kept in contact with the housing without gaps, the water leakage location can be kept sealed, and the water stoppage can be maintained.
In addition, even when the gap between the water leakage points is expanded or narrowed, the porous sheet can keep the water leakage point sealed and maintain the water stoppage.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a housing that has been water-stopped by an example of the water-stop method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Junker part (water leak location), 4 ... Porous body sheet, 5 ... Plate body, 5a ... Injection port

Claims (1)

A porous sheet that communicates with the outer surface so as to cover the leaked portion is applied to the leaked portion of the casing, and the plate body is placed on the casing in a state in which a plate body that extends over almost the entire surface of the porous sheet is disposed thereon. A waterproofing method, wherein a hydrophilic polymerization curable liquid waterproofing agent is injected from an injection port provided in the plate body and impregnated into the porous sheet.

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