JP4030893B2 - High pressure injection water stop method and water stop material for water stop material made of hydrophilic one-component polyurethane prepolymer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-pressure injection water-stop method and a water-stop material for a water-stop material made of a hydrophilic one-component polyurethane prepolymer that can appropriately stop water cracks such as cracks and joints in a concrete structure.
[0002]
[Prior art]
In order to stop the leaking concrete wall, it must have the following performance.
(1) It is possible to inject deeply into the discontinuous part of jointing and cracking (injection filling property).
(2) Adhere well to wet concrete surface (water stop adhesion).
(3) Excellent alkali resistance (durability).
[0003]
For this reason, the conventional water-stop method injects an injectant made of moisture-curing polyurethane prepolymer at high pressure into leaking cracks such as cracks and joints in concrete structures, and cures by reaction with water. In order to inject a large amount of injectant into the water leakage crack and cure rapidly by simply utilizing the reaction hardening of the polyurethane prepolymer with water, Addition of a catalyst or a foaming accelerator for increasing the reaction rate has been actively carried out.
[0004]
In this method, a hardened body is rapidly formed on the surface layer portion of the concrete structure, but fine cracks are left without entering the concrete structure. However, it was not possible to recover the physical strength and water tightness of the concrete structure itself, which was deteriorated due to water leakage.
[0005]
Accordingly, there is also provided a water stopping method that solves the problems in the conventional water stopping method and economically and reliably stops water, and also restores the strength and water tightness of the concrete structure itself.
[0006]
In this water stop method, a sealed chamber is formed along a water leak crack in a concrete structure, and a predetermined amount of a water stop injecting agent containing a hydrophilic one-component polyurethane prepolymer as a main component is injected into the sealed chamber. After that, the sealed chamber is closed and retained and left. The hydrophilic one-part polyurethane prepolymer and the water leakage in the concrete structure react gradually, and the water leakage cracks due to the foaming pressure and volume expansion. The cracks are sealed and bonded by entering and hardening in the gap. This water-stopping method ensures the physical strength and water-tightness of the concrete structure itself, which has been reduced by water leakage, by securely adhering fine cracks while infiltrating the water-stopping injection into the concrete structure. Is recovering. (For example, see Patent Document 1)
[0007]
[Patent Document 1]
Japanese Examined Patent Publication No. 6-78520 (first page, claims section, page 4 left column, last line 9 to page 5, left column seventh line, FIGS. 1 and 2)
[0008]
Therefore, the water-stopping injectant based on the hydrophilic one-component polyurethane prepolymer used in the water-stopping method exhibits a sufficient compressive strength and bending strength and a sufficient tensile strength of the cured film. However, the viscosity is adjusted to about 2800 mPa · s, and the penetration of the water-stopping injectant into the water leakage crack is due only to the foaming pressure and volume expansion generated by the chemical reaction with the intrusion water. However, it has been difficult to reliably infiltrate the water-injecting agent with respect to leakage cracks such as cracks and joints in civil engineering-type large concrete structures depending on the situation such as insufficient intrusion water.
[0009]
On the other hand, a water stop method for a large concrete structure has also been proposed as in the following example.
[0010]
In this construction method, as shown in FIG. 7, an outline of the construction is perforated from the inside of the concrete wall surface 20, and the opening position 22 is made of concrete while passing through the center portion of the gap portion by the joint portion 21 (or crack portion). An injection hole 24 is formed so as to be the central position 23 of the thickness. (FIGS. 7A and 7B) Next, an injection tool 26 is attached to the opening 25 of the injection hole 24 to form a pressure region 28 between the bottom 27 of the injection hole and the injection tool 26. , 100 to 350 kg / cm of the filler 29 from the injection tool 26 to the pressure region 28²Injecting at an injection pressure of. (Fig. 7 (C), (D))
[0011]
The filler 29 is made of a hydrophobic polyisocyanate or a hydrophilic polyisocyanate, and is injected up to 30 flowing out to the inside of the concrete wall surface 20 and collected in the gap portion of the joint portion 21 (or crack portion). The discharged water is discharged and the gap is replaced with the filler 29. (Fig. 7 (E))
[0012]
And the filler after injection | pouring hardens | cures in the space | gap part of a joint part (or crack part) by being cured, and it reaches this stage and removes the injection tool 26 from the opening part 25 of an injection hole, and concrete. Finishing 31 of the wall surface 20 is performed. (Fig. 7 (F))
[0013]
Therefore, the hydrophobic polyisocyanate or hydrophilic polyisocyanate that is a filler is concerned with environmental problems due to the addition of a catalyst and a curing accelerator that increase the reaction rate, and the following problems are also present in the method. I have it.
[0014]
(1) Even if an injection hole is provided at the center of the concrete thickness, it is injected without blocking the joints and cracks, so that it is difficult for the filler to enter the ground due to the intrusion of water with pressure. Since it is easy to inject inside, even if it flows out to the indoor side, there are many cases where it is not filled in the back, and the injection filling property is not good.
(2) Polyurethane fillers such as hydrophobic polyisocyanate and hydrophilic polyisocyanate have no foaming pressure, low strength, unfavorable adhesion and durability, and form highly durable and highly reliable waterproof adhesive It is difficult to re-leak water. (For example, see Patent Document 2)
[0015]
[Patent Document 2]
Japanese Patent No. 3306375 (identification symbols “0009” to “0017”, FIGS. 1 and 3)
[0016]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above situation, and it is possible to ensure the foam filling of the water-stopping material and prevent the filling and sealing against water leakage cracks such as cracks and joints in mass concrete. The present invention provides a high-pressure injection water-stop method and a water-stop material for a water-stop material made of a hydrophilic one-pack type polyurethane prepolymer that can establish water-adhesion and durability required performance and can stop water appropriately.
[0017]
[Means for Solving the Problems]
  The high-pressure injection water-stop method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 1 is a water-stop material comprising a hydrophilic one-component polyurethane prepolymer as a main component for a concrete structure. In the injection water-stop method, the water-sealing material injection hole is drilled at a predetermined angle from the concrete surface with respect to the water leakage crack of the concrete structure, and a sealed chamber is provided to hold the water-stopping material in a state of crossing the water leakage crack. Forming and then sealing the leak cracks in the concrete surfaceMoisture includedA hollow reinforcing member filled with a polymeric water-absorbing polymerIn a sealed roomAfter insertion, an injection plug with a backflow prevention valve is attached to the water stop material injection hole, and then a water stop material mainly composed of a hydrophilic one-component polyurethane prepolymer is injected from the injection plug to leak water in the sealed chamber. Fill the cracks with a predetermined amount and use a water-absorbing polymer as the water-stopping material.Moisture contained inIt is characterized by infiltrating into the water leakage crack while foaming by a chemical reaction with intrusion water, and injection filling and waterproofing adhesiveness even for water leakage cracks such as cracks and joints in large concrete structures And the required performance of durability is established and water is stopped appropriately.
[0018]
The high-pressure injection water-stop method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 2 is the high-pressure injection water-stop method according to claim 1, wherein an injection confirmation hole for a water leakage crack is provided. In addition to the above function, in addition to the above function, the reaction water and the reaction water and the water from the cracks in the concrete surface By observing that the water-stopping material flows out, it can be confirmed that the water-stopping material is also injected into the leaked crack.
[0019]
The high-pressure injection water-stop method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 3 is the high-pressure injection water-proof method according to claim 1 or 2, wherein the water leakage cracks in the concrete surface layer In addition to the above functions, the water leakage cracks in the concrete surface layer are sealed in the water leakage cracks and the sealed chamber that crosses the water leakage cracks. By observing that the reaction water flows out from the water, it is possible to confirm the crossing of the water stop material injection hole against the water leakage crack.
[0020]
The high-pressure injection water-stop method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 4 is the water-stop method for water-stopping according to any one of claims 1 to 3. In addition to the above functions, in addition to the above functions, the pressure of the water-stopping material and the occurrence of volume expansion are generated. It further enhances the function of sealing and cracking by entering and hardening into the gap between leaking cracks.
[0021]
The high-pressure injection water-stop method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 5 is the water-stop method for water-stopping according to any one of claims 1 to 4. The material is injected into the sealed chamber and the water leakage crack at a pressure of 10 to 20 MPa. In addition to the above function, the water stop material before foaming is appropriately infiltrated into the space between the water leakage cracks.
[0022]
The high-pressure injection water-stop method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to the invention described in claim 6 is the high-pressure injection water-stop method according to any one of claims 1 to 5. In addition to the above functions, the amount of water-stopping material used can be adjusted appropriately in order to determine the filling and injection amount of the material in consideration of the expansion ratio exhibited by the chemical reaction with the intrusion water. it can.
[0023]
The water-stopping material according to the present invention is used for each of the above-described high-pressure injection water-stopping methods, and the water-stopping material containing a hydrophilic one-component polyurethane prepolymer as a main component has a viscosity of 700 to 1400 mPa · s. It is characterized by the fact that it has improved filling and filling properties against water leakage cracks in large concrete structures, and has established water-stopping with excellent water-stopping adhesion and durability.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, a high-pressure injection waterproofing method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer is formed by drilling a water-stopping material injection hole at a predetermined angle from a concrete surface layer against a water leakage crack of a concrete structure. After forming a sealed chamber for retaining the water stop material in a state of crossing the water leakage crack, and then sealing the water leakage crack in the concrete surface layer and inserting a hollow reinforcing member filled with a polymeric water-absorbing polymer into the sealed chamber Attach an injection plug with a backflow prevention valve to the water stop material injection hole, then pressurize a water stop material mainly composed of a hydrophilic one-component polyurethane prepolymer from the injection plug to form a sealed chamber and a water leakage crack. Basically, a predetermined amount is filled, and the water blocking material is infiltrated into the water leakage crack while foaming by a chemical reaction with the polymer water-absorbing polymer and the intrusion water. Drilling the water leakage crack in a state that crosses the water leakage crack from the concrete surface layer to the concrete surface side of the water stop injection hole at a predetermined angle, or the leakage crack of the concrete surface layer into After the reaction water is pressure-injected from the water-stopping material injection hole and wetted, it is sealed, or the water-stopping material is injected after the reaction water is injected at a pressure of 10 to 20 MPa into the leaking crack and the sealed chamber crossing the leaking crack. It is characterized by injecting under pressure and determining the filling injection amount in consideration of the expansion ratio exhibited by the chemical reaction with the intrusion water.
[0025]
Hereinafter, an embodiment of a high-pressure injection waterproofing method according to the present invention will be described in detail with reference to the drawings.
[0026]
FIG. 1 is a diagram showing an embodiment in which the high-pressure injection waterproofing method according to the present invention is applied to a concrete wall having a large wall thickness. FIG. 1 (a) shows a water stoppage due to a water leakage crack caused by a crack generated on a concrete wall surface. The process of drilling the material injection hole is shown.
[0027]
The water stop injection hole 2 drilled from the inside of the concrete wall 1 has an angle of about 60 degrees with respect to the discontinuous surface of the crack 3 and the water stop injection hole 2 having a diameter of 10 mm crosses the discontinuous surface. The airtight chamber 5 for holding the water blocking material 4 is formed. In the case of the present embodiment, the water-stopping material injection hole 2 is opened at a position about 2/3 of the wall thickness deeper than the center position of the concrete wall 1, and the injection hole is arranged on a crack or joint surface. On the other hand, it goes in a zigzag pattern.
[0028]
  The drilling depth of the drill must beDiscontinuous surfaceIn consideration of crossing, the hole is further drilled to a position that is 100 mm or more deeper than the estimated distance to the discontinuous surface.
[0029]
FIG. 1 (b) shows a state in which the injection plug with a backflow prevention valve in the next step is mounted. After the water stop material injection hole 2 has been drilled, the water stop material inlet hole 2 is necessary. The concrete powder remaining inside is carefully removed by air blow.
[0030]
In this step, the injection plug 7 with the backflow prevention valve is attached to the opening 6 of the water stop material injection hole 2. At this time, the hollow reinforcing member 12 in which the sealed water chamber 5 is filled with the polymer water-absorbing polymer 11. And the surface of the crack 3 is sealed with quick setting cement 8 or the like. As a result, when the water-stopping material is injected from the opening 6, the water-stopping material is prevented from leaking inward from the crack 3 of the concrete wall 1. The water stop material volume-expanded by foaming generated while chemically reacting with the contained moisture is filled deeply outside the concrete frame.
[0031]
  The water supply to the polymer water-absorbing polymer 11 is supplied at a stage where the polymer water-absorbing polymer 11 is filled in the hollow reinforcing member 12, or the sealed chamber 5 is filled with the polymer water-absorbing polymer 11 in the hollow. After inserting the reinforcing member 12, it can be considered that the water 9 injected at a pressure of 5 to 10 MPa is supplied from the following injection plug 7 with a backflow prevention valve, but the water-absorbing polymer 11 is impregnated with the water in advance. It is better to fillIt can be said.
[0032]
  Fig. 1 (c) shows that the waterstop material is sealed and cracked.Discontinuous surfaceThe pre-process for inject | pouring into is shown.
  In this step, water 9 is injected from the injection plug 7 with a backflow prevention valve at a pressure of 5 to 10 MPa.Discontinuous surfaceIn addition, water 9 sufficient for the foam hardening reaction of the water stop material 4 is supplied in advance.
[0033]
  The water stop material injection hole 2 has cracks 3.Discontinuous surfaceWhile checking whether it is connected to theConfirmationThe construction to do will be described in other embodiments described later.
[0034]
  Fig. 1 (d) shows the water-stopping material in the sealed chamber and cracks.Discontinuous surfaceThe process of injecting is shown.
  In the present embodiment, the water stop material 4 is injected into the water stop material injection hole 2 at a pressure of 10 to 20 MPa, and after filling a predetermined injection amount, the next injection plug with a backflow prevention valve is disposed. Move to 7 and inject high pressure sequentially. The water-stopping material 4 according to the present invention has the water 9 supplied to the polymer water-absorbing polymer 11, the crack 3 and the sealed chamber 5 after all the injections are completed and the crack 3 and the sealed chamber 5 are reserved. By chemically reacting with water penetrating from the outside of the concrete frame, it foams and expands before it hardens.
[0035]
By this volume expansion, the water stop material 5 surely penetrates to the corners of the crack 3 on the outside of the concrete casing, and the entire area of the crack 3 can be completely stopped.
Curing of the water-stopping material is started after the end of the volume expansion, but after the water-stopping material has hardened through a predetermined curing period, the head of the injection plug 7 with the backflow prevention valve is shown in FIG. While folding the part, the quick setting cement 8 is also removed, and the concrete wall 1 is finished with repair mortar or the like.
[0036]
As described above, the high-pressure injection waterproofing method according to the present invention seals the inner surface of the cracked concrete wall, so that the water-stopping material is injected at high pressure and foamed while chemically reacting with the polymer water-absorbing polymer. Due to the volume expansion due to the above, it will be filled deeply outside the concrete frame, and even for large concrete structures, it is necessary to fill and seal against water leakage cracks such as cracks and joints, waterproof adhesion and durability Performance is established and appropriate water stoppage is achieved.
[0037]
Next, another embodiment of the high-pressure injection waterproofing method according to the present invention will be described.
This embodiment is characterized in that the injection confirmation hole for the water leakage crack is drilled at a predetermined angle from the concrete surface layer so as to cross the water leakage crack to the concrete surface layer side of the water stop material injection hole. In addition to the function of the form, by observing that the reaction water and the water stop material flow out from the water leak crack in the concrete surface layer, it can be confirmed that the water stop material is also injected into the water leak crack. .
[0038]
FIG. 2 is a diagram showing an embodiment in which an injection confirmation hole is drilled in a water leak crack in a concrete wall. FIG. 2A shows a water stop material injection hole and an injection confirmation hole in a crack generated on a concrete wall. The process of drilling is shown.
[0039]
In the present embodiment, the water-stopping material injection hole 2 is drilled in the same manner as in the above-described embodiment, and the injection confirmation hole 10 is not damaged by the crack 3 located on the concrete surface side of the water-stopping material injection hole 2. It is opened at a predetermined angle from the concrete surface layer so as to cross the continuous surface. The injection confirmation hole 10 is opened at a position about 100 mm from the surface of the concrete wall 1 so as to cross the discontinuous surface, and an opening with the discontinuous surface of the injection confirmation hole 10 is opened in the concrete wall 1. The water stop material injection hole 2 is formed at a position before the opening position with the discontinuous surface.
[0040]
In this way, the infiltration water that has penetrated into the discontinuous surface of the crack 3 is drained, and at the same time, the filling condition when the water-stopping material 5 is injected from the water-stopping material injection hole 2 is improved and the filling state is confirmed. Is also possible.
[0041]
FIG. 2 (b) shows a state in which the injection plug with a backflow prevention valve is mounted, but the concrete remaining inside the water stop material pouring hole 2 as necessary, as in the above embodiment. The powder is carefully removed by air blow.
[0042]
  When the injection plug 7 with the backflow prevention valve is attached to the opening 6 of the water stop material injection hole 2, the surface of the crack 3 is sealed with the quick-setting cement 8 or the like. By being opened, the water-stopping material injection hole 2 is cracked 3 so that the intrusion water is drained and confirmed in the next process.Discontinuous surfaceIt is possible to check the connection status and the filling condition of the water stop material.
[0043]
  Fig. 2 (c) shows that the water-stopping material injection hole is cracked.Discontinuous surfaceMake sure that the water-stopper is connected to the sealed chamber and cracks.Discontinuous surfaceThe process of confirming the filling status of the water-stopping material when injecting into the water.
[0044]
  In this step, water 9 is injected at a pressure of 5 to 10 MPa from the injection plug 7 with a backflow prevention valve, and the injected water 9 is injected into the sealed chamber 5 and the crack 3 from the water stop material injection hole 2.Discontinuous surfaceAnd penetratedDiscontinuous surfaceThe water stoppage material injection hole 2 is cracked 3 because it flows out of the injection confirmation hole 10.Discontinuous surfaceIt can be confirmed that sufficient water for foaming and hardening of the waterstop material 4 has been supplied in advance.
[0045]
  In addition, as in the above-described embodiment, the water-stopping material 4 is injected from the water-stopping material injection hole 2 at a pressure of 10 to 20 MPa after the present step.Discontinuous surfaceIt is a thing of reconfirmation that it is connected.
[0046]
  That is, the water stop material 4 is cracked 3Discontinuous surfaceWhen water is injected at a high pressure, the water blocking material 4 first flows out from the injection confirmation hole 10 which is more easily penetrated than the outside of the concrete frame where the intrusion water pressure is acting.Discontinuous surfaceIt is confirmed that is sufficiently filled with the water-stopping material.
[0047]
In the present embodiment, the injection check hole 10 is closed with cotton, a wooden piece, a rubber plug or the like so that the water stop material 4 does not flow out when the water stop material 4 is confirmed to flow out. The filling amount is filled.
[0048]
Accordingly, the waterstop material 4 is chemically reacted and foamed in the same manner as in the above embodiment, and is cured after being deeply penetrated to the outside of the concrete frame with sufficient volume expansion required. Will establish water.
[0049]
Further, in another embodiment, the water leakage cracks in the concrete surface layer are sealed after the water leakage cracks and the sealed chamber crossing the water leakage cracks are wetted by pressure injection of the reaction water in another embodiment. In addition to the functions of the above-mentioned embodiment, it is confirmed that the water stop material injection hole surely crosses the leak crack by simply observing that the reaction water flows out from the leak crack on the concrete surface layer. it can.
[0050]
FIG. 3 is a view of another embodiment for confirming that the water-stopping material injection hole crosses the leak crack of the concrete wall.
[0051]
  In the present embodiment, the water 9 is injected from the injection plug 7 with a backflow prevention valve at a pressure of 5 to 10 MPa, but the cracks 3 appearing on the surface of the concrete wall are not sealed with rapid cement or the like. Therefore, the injected water 9 flows from the water stop material injection hole 2 into the sealed chamber 5 and the crack 3.Discontinuous surfaceAnd penetratedDiscontinuous surfaceHowever, since the water outflow from the crack 3 appearing on the surface of the concrete wall, the water stop injection hole 2 isDiscontinuous surfaceIt can be confirmed that sufficient water for foaming and hardening of the waterstop material 4 has been supplied in advance.
[0052]
  Then, the injection of the water-stopping material 4 performed after the above confirmation is performed after the crack 3 appearing on the surface of the concrete wall is sealed with a quick-setting cement or the like, so that a predetermined amount of the water-stopping material 4 is cracked. ThreeDiscontinuous surfaceWhen injected at a high pressure, it foams while chemically reacting with the polymeric water-absorbing polymer 11 as in the above embodiment, and is hardened after deeply penetrating to the outside of the concrete frame by volume expansion.
[0053]
As described above, the high-pressure injection waterproofing method for a waterproofing material comprising a hydrophilic one-component polyurethane prepolymer according to the present invention is excellent in workability, injection filling property, waterproof adhesiveness and durability as described below. Therefore, it has excellent water-stopping effect on cracks that are leaking, can be expected to have long-term water-stopping durability, and at the same time, shortens the construction period and ensures a beautiful finish. Can be easily deceived.
[0054]
(1) Since it is high-pressure injection with the surface of cracks and joints sealed, the pressure can be transferred to the water-stopping material without waste and injected into every corner of narrow cracks.
{Circle around (2)} The foam hardening reaction that occurs while chemically reacting with the polymer water-absorbing polymer is slow, and since the infiltration is performed with the expansion pressure after high-pressure injection, it is possible to stop water in every corner of a narrow crack.
[0055]
Next, the water stop material used in the high pressure injection water stop method according to the present invention will be described.
The water-stop material according to the present invention is a water-stop material mainly composed of a hydrophilic one-component polyurethane prepolymer, and has a viscosity of 700 to 1400 mPa · s at room temperature. In addition, it has improved injection filling properties, and has established a water stop with excellent water stop adhesion and durability.
[0056]
The water-stopping material according to the present invention is mainly composed of a hydrophilic one-component polyurethane prepolymer, but this hydrophilic one-component polyurethane prepolymer basically has a property of foaming and curing by reacting with water. For example, polyalkylene glycol, polyalkylene glycol alkyl ether, polyalkylene glycol aryl ether, polyalkylene glycol alkyl aryl ether, or a mixture of polyalkylene glycol and organic acid ester of polyalkylene glycol, and an isocyanate group. It is a reaction product obtained by reacting with an organic compound.
[0057]
Here, polyalkylene glycol, polyalkylene glycol alkyl ether, polyalkylene glycol aryl ether, and polyalkylene glycol alkyl aryl ether are ethylene oxide or propylene oxide polymers or copolymers thereof, and have a molecular weight of 1000 to 10,000. The organic acid ester of polyalkylene glycol is a polyvalent carboxylic acid ester of polyalkylene glycol, and specific examples of the polyvalent carboxylic acid include maleic acid, adipic acid, and phthalic acid.
[0058]
Examples of the compound having an isocyanate group that reacts with the polyalkylene glycol, polyalkylene glycol alkyl ether, polyalkylene glycol aryl ether, polyalkylene glycol alkyl aryl ether, or a mixture thereof with an organic acid ester of polyalkylene glycol include isocyanate. A compound having at least two groups, and specific examples include tolylene diisocyanate, methylene diphenyl diisocyanate (polymethylene polyphenylene isocyanate), xylylene diisocyanate, hexamethylene diisocyanate, and the like. Of these, tolylene diisocyanate and methylene diphenyl diisocyanate are preferable for controlling the curing rate.
[0059]
The ratio of polyalkylene glycol, polyalkylene glycol alkyl ether, polyalkylene glycol aryl ether, polyalkylene glycol alkyl aryl ether, or a mixture of polyalkylene glycol and organic acid ester of polyalkylene glycol and an organic compound having an isocyanate group is The former is preferably reacted in the range of 1 to 10 isocyanate groups per hydroxyl group. When the former hydroxyl group is reacted at a ratio of less than one isocyanate group, the degree of polymerization is lowered and the curability is inferior. On the other hand, the number of 10 or more is not preferable because the polymerization rate is high and the control of the curing rate is difficult.
[0060]
The reaction method of the hydrophilic one-component polyurethane prepolymer is a reaction performed by a generally known method, and the hydrophilic one-component polyurethane prepolymer (2R-NCO) is water (H₂Carbon dioxide (CO) in contact with O)₂The reaction formula for forming a cured product (R-NHCONH) while foaming and expanding by causing a chemical reaction to generate) is as follows.
2R-NCO + H₂O → R-NHCONH-R + CO₂
[0061]
In the present embodiment, the viscosity of the hydrophilic one-component polyurethane prepolymer is adjusted to 700 to 1400 mPa · s, and in addition to this, it is blended so as to exhibit the following various characteristics.
[0062]
○ Specific gravity 1.16 g / cm^Three
○ Apparent density 0.09 g / cm²
○ Compressive strength 0.15 to 0.19 MPa
○ Bending strength 0.41-0.61 MPa
○ Closed-cell ratio 77.8-80.2%
○ Temperature-viscosity characteristics Fig. 4
[0063]
The conventional hydrophilic one-component polyurethane prepolymer and the general one and the winter one for the hydrophilic one-component polyurethane prepolymer according to the present invention are shown in comparison.
[0064]
○ Foaming speed Fig. 5 General use (a), Winter use (b)
Since the hydrophilic one-component polyurethane prepolymer becomes faster as the reaction becomes higher in temperature, the foaming time becomes shorter as the temperature increases.
[0065]
○ Foaming ratio Fig. 6 General use (a), Winter use (b)
The foaming ratio of the hydrophilic one-component polyurethane prepolymer increases as the temperature increases, and the foaming ratio tends to decrease as the mixing ratio of water increases, and there is no difference in water quality.
[0066]
○ Tensile strength of cured product with suppressed foaming 35-42 MPa
[0067]
  The water-stopping material according to the present invention is mainly composed of a hydrophilic one-component polyurethane prepolymer, and has the above characteristics, so that cracks and joints generated in a concrete structure having a large wall thickness can be obtained.Discontinuous surfaceOn the other hand, a water-stop material mainly composed of a hydrophilic one-component polyurethane prepolymer easily penetrates when injected at high pressure from an injection plug with a backflow prevention valve attached to the water-stop material injection hole. Thus, the water-stopping material can form a water-stopping adhesive system having excellent adhesion to a wet surface, strength properties of the cured product, and tensile strength.
[0068]
As mentioned above, although the present invention has been described in detail based on the embodiment, the high-pressure injection water-stop method and the water-stop material of the water-stop material made of the hydrophilic one-component polyurethane prepolymer according to the present invention are the above-described embodiments. Of course, various modifications can be made by applying what is already known at the time of filing without departing from the spirit of the present invention.
[0069]
【The invention's effect】
  The high-pressure injection waterproofing method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 1 is an injection-stopping of a water-stopping material containing a hydrophilic one-component polyurethane prepolymer as a main component for a concrete structure. In the water construction method, a water blocking material injection hole is drilled at a predetermined angle from the concrete surface to a water leakage crack of a concrete structure to form a sealed chamber for retaining the water blocking material in a state of crossing the water leakage crack, and then As well as sealing water leakage cracks in the concrete surfaceMoisture includedA hollow reinforcing member filled with a polymeric water-absorbing polymerIn a sealed roomAfter insertion, an injection plug with a backflow prevention valve is attached to the water stop material injection hole, and then a water stop material mainly composed of a hydrophilic one-component polyurethane prepolymer is injected from the injection plug to leak water in the sealed chamber. Fill the cracks with a predetermined amount and use a water-absorbing polymer as the water-stopping material.Moisture contained inIn addition, it is characterized by infiltrating into the water leakage crack while foaming by chemical reaction with intrusion water, so it is excellent in the specific water stop effect of the cracking as described below, and has long-term water stop durability. It can be expected, shortening the construction period and ensuring a beautiful finish, so that it can easily be constructed on a concrete wall with a large wall thickness, and it establishes the required performance of injection filling property, waterproof adhesiveness and durability appropriately Demonstrates the ability to stop water.
[0070]
(1) Since high pressure injection is performed with the surface of cracks and joints sealed, the pressure is transmitted to the water stop material without waste and can be injected to every corner of narrow cracks.
(2) High polymer water-absorbing polymerMoisture contained inThe foam hardening reaction that occurs while undergoing a chemical reaction is slow, and since the infiltration is carried out with the expansion pressure after high-pressure injection, it is possible to stop water in every corner of a narrow crack.
[0071]
The high-pressure injection waterproofing method for a water-stopping material comprising the hydrophilic one-component polyurethane prepolymer according to claim 2 is the high-pressure injection waterproofing method according to claim 1, wherein an injection confirmation hole for a water leakage crack is provided on a concrete surface layer. In addition to the above effects, in addition to the above effects, the reaction water and the water stoppage are obtained from the water surface cracks in the concrete surface layer. By observing that the material flows out, it is possible to confirm that the water-stopping material is being injected even during the water leakage crack.
[0072]
The high-pressure injection waterproofing method for a water-stopping material comprising the hydrophilic one-component polyurethane prepolymer according to claim 3 is the high-pressure injection waterproofing method according to claim 1 or 2, wherein leakage cracks in the concrete surface layer are leaked. In addition to the above effects, it reacts from water leakage cracks in the concrete surface layer because the reaction water is injected under pressure from the water-stopping material injection hole into the sealed chamber that crosses the cracks and the water leakage cracks, and then sealed. By observing the outflow of water, the effect of confirming the crossing of the water-stopping material injection hole against the water leakage crack is demonstrated.
[0073]
The high-pressure injection water-stop method for a water-stopping material comprising the hydrophilic one-component polyurethane prepolymer according to claim 4 is the high-pressure injection water-stop method according to any one of claims 1 to 3, wherein the water-stop material is leaked. Since the reaction water is injected under pressure after being injected into the sealed chamber that crosses the crack and the water leakage crack, in addition to the above effects, the generation of foaming pressure and volume expansion of the water-stopping material is promoted. It has the effect of further strengthening the function of sealing and cracking by entering and hardening in the gap between leaking cracks.
[0074]
The high-pressure injection water-stop method for a water-stopping material comprising the hydrophilic one-component polyurethane prepolymer according to claim 5 is the high-pressure injection water-stop method according to any one of claims 1 to 4, Since it is characterized in that it is injected into the sealed chamber and the water leakage crack at a pressure of 10 to 20 MPa, in addition to the above effects, it exhibits the effect that the water-stopping material before foaming can be appropriately infiltrated between the water leakage cracks. Yes.
[0075]
The high-pressure injection water-stop method for a water-stopping material comprising the hydrophilic one-component polyurethane prepolymer according to claim 6 is the same as the high-pressure injection water-stop method according to any one of claims 1 to 5, In addition to the above effects, the injection amount is determined in consideration of the foaming ratio exhibited by the chemical reaction with the intrusion water. ing.
[0076]
The water-stopping material according to the present invention is used for each of the above-described high-pressure injection water-stopping methods, and the water-stopping material containing a hydrophilic one-component polyurethane prepolymer as a main component has a viscosity of 700 to 1400 mPa · s. Therefore, it is possible to establish water-stopping with excellent water-stopping adhesion and durability by improving the filling and filling properties against water leakage cracks in large concrete structures. It has the effect of forming a water-stopping adhesive system with excellent strength properties and tensile strength.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment in which a high-pressure water-stop method according to the present invention is applied to a concrete wall having a large wall thickness.
FIG. 2 is a diagram showing another embodiment in which the high-pressure water filling method according to the present invention is applied to a concrete wall having a large wall thickness.
FIG. 3 is a diagram showing another embodiment in which the high-pressure water filling method according to the present invention is applied to a concrete wall having a large wall thickness.
FIG. 4 is a temperature-viscosity characteristic diagram of a waterstop material according to the present invention.
[FIG. 5] Foaming speed chart of water-stopping material according to the present invention
FIG. 6 is an expansion ratio diagram of a waterstop material according to the present invention.
[Fig. 7] High-pressure injection stoppage for conventional concrete wall with large wall thickness
[Explanation of symbols]
1 concrete wall, 2 water-stopping material injection hole, 3 cracks, 4 water-stopping material,
5 sealed chamber, 6 opening, 7 injection plug with backflow prevention valve,
8 quick setting cement, 9 water, 10 injection confirmation hole,
11 polymer water-absorbing polymer, 12 hollow reinforcing member,
20 concrete wall, 21 joint, 22 opening position,
23 center position, 24 injection hole, 25 opening, 26 injection tool,
27 bottom, 28 pressure zone, 29 filler, 30 outflow,

Claims (7)

In the water-stopping method for water-stopping material consisting mainly of a hydrophilic one-component polyurethane prepolymer for concrete structures, the water-stopping material injection hole is cut at a predetermined angle from the concrete surface layer against leakage cracks in the concrete structure. and the hole, to form a closed chamber for holding a water stopping material while traversing該漏water crack, was then filled with a polymer based water polymer contains moisture while blocking the leakage cracking the concrete surface hollow After inserting a reinforcing member into the sealed chamber, an injection plug with a backflow prevention valve is attached to the water stop material injection hole, and then a water stop material mainly composed of a hydrophilic one-component polyurethane prepolymer is provided from the injection plug. and injected under pressure by a predetermined amount filled into the leakage cracks and the sealed chamber, saturated with該止waterstops in leakage cracks while blowing a chemical reaction with moisture and ingress water contained in the polymer-based water-absorbing polymeric High pressure injection water stop method of water stopping material comprising a hydrophilic one-polyurethane prepolymer, characterized in that to. 2. The hydrophilicity according to claim 1, wherein the injection confirmation hole for the water leakage crack is drilled at a predetermined angle from the concrete surface layer so as to cross the water leakage crack to the concrete surface layer side of the water stop material injection hole. A high-pressure injection water-stop method for water-stop materials made of a one-component polyurethane prepolymer. The leak crack of the concrete surface layer is sealed after being wetted by pressurizing the reaction water from the water-stopping material injection hole into the leak crack and the sealed chamber crossing the leak crack. A high-pressure injection waterproofing method for a waterproofing material comprising the hydrophilic one-component polyurethane prepolymer described in 1. The hydrophilic single liquid according to any one of claims 1 to 3, wherein the water-stopping material is injected under pressure after injecting the reaction water under pressure into the leakage crack and the sealed chamber crossing the leakage crack. High pressure injection water stop method for water stop material made of type polyurethane prepolymer. The water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to any one of claims 1 to 4, wherein the water-stopping material is injected into the sealed chamber and the water leakage crack at a pressure of 10 to 20 MPa. High pressure injection water stop method. The hydrophilic one-component polyurethane according to any one of claims 1 to 5, wherein the filling and injection amount of the water-stopping material is determined in consideration of the expansion ratio exhibited by the chemical reaction with the intrusion water. High-pressure injection water-stop method for water-stop material made of prepolymer The high-pressure injection water-stop method according to any one of claims 1 to 6, wherein the water-stop material comprises a hydrophilic one-component polyurethane prepolymer as a main component and has a viscosity of 700 to 1400 mPa · s. Water-stopping material mainly composed of hydrophilic one-component polyurethane prepolymer used in

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