JP2004251008A - High-pressure injection water cutoff method using water cut-off material composed of hydrophilic one-component polyurethane prepolymer, and the material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure injection water cutoff method and a water cutoff material, which enable appropriate cutoff by establishing required performance, that is, injection filling properties, cutoff adhesive properties and durability, even for a water leakage crack such as a cracked part of a concrete structure and a placing joint part thereof. <P>SOLUTION: A cutoff material injecting hole 2 is drilled in the water leakage crack 3 of a concrete wall 1 at a prescribed angle with respect to a concrete surface layer, so that a hermetically sealed chamber 5 for retaining the cutoff material can be formed while crossing the crack 3; next, an injection plug 7 with a non-return valve is fitted into the hole 2 after the crack 3 of the concrete surface layer is sealed and after a hollow reinforcing member 12 filled with a water-absorbing polymer 11 is inserted into the chamber 5; after that, the cutoff material 4, which is mainly composed of a hydrophilic one-component polyurethane prepolymer, is pressure-injected from the injection plug 7 so as to be infilled into the hermetically sealed chamber and the water leakage crack in prescribed quantities; and the cutoff material 4 is made to permeate into the water leakage crack while being foamed by the chemical reaction of the water-absorbing polymer and infiltrating water. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-pressure injection water-stopping method and a water-stopping material for a water-stopping material made of a hydrophilic one-component polyurethane prepolymer capable of properly stopping water leakage cracks such as cracks and joints in a concrete structure.
[0002]
[Prior art]
In order to stop water from leaking concrete walls, they must have the following performance.
(1) Injection can be performed deep into discontinuous portions such as joints and cracks (injection filling property).
(2) Good adhesion to wet concrete surface (waterproof adhesion).
(3) It has excellent alkali resistance and the like (durability).
[0003]
For this reason, the conventional water stopping method is to inject an injection agent composed of a moisture-curable polyurethane prepolymer under high pressure into water leakage cracks such as cracks and joints in concrete structures, and to cure by reacting with water. Although the leakage is stopped while allowing the polyurethane prepolymer to react and harden simply with water, a large amount of injection material is injected into the water leakage crack and quickly cured, so that the polyurethane prepolymer Addition of catalysts and foaming accelerators that increase the reaction rate has been actively performed.
[0004]
According to this method, a hardened body is rapidly formed on the surface of a concrete structure, but fine cracks are left without penetrating into the inside of the concrete structure. No attempt has been made to recover the adhesion of fine cracks and the recovery of the physical strength and water tightness of the concrete structure itself which has been reduced by water leakage.
[0005]
Therefore, there has been provided a water stopping method that solves the problems of the conventional water stopping method and that economically and surely stops the water, and also restores the strength and water tightness of the concrete structure itself.
[0006]
In this water stopping method, a sealed chamber is formed along a water leakage crack of a concrete structure, and a predetermined amount of a water stopping filler containing a hydrophilic one-component polyurethane prepolymer as a main component is injected into the sealed chamber. After that, the closed chamber is closed and retained and allowed to stand, and the hydrophilic one-pack type polyurethane prepolymer and the water leakage in the concrete structure gradually react with each other. It penetrates and hardens into the gap to seal and bond the crack. The water-stopping method uses a water-stopping injectant that penetrates into the concrete structure while securely adhering fine cracks, thereby reducing the physical strength and watertightness of the concrete structure itself that has been reduced due to water leakage. Is recovering. (For example, see Patent Document 1)
[0007]
[Patent Document 1]
Japanese Patent Publication No. 6-78520 (1st page, claims, 9 lines from the last line of the left column on page 4 to 7 lines of the left column on page 5; FIGS. 1 and 2)
[0008]
Thus, the water-stopping filler containing a hydrophilic one-pack type polyurethane prepolymer as a main component used in the water-stopping method exhibits sufficient compressive strength and bending strength and sufficient tensile strength of the cured film. However, since its viscosity is adjusted to about 2800 mPa · s, and the penetration of the water-stopping filler into the leak crack depends only on the foaming pressure and volume expansion generated by the chemical reaction with the intruding water. However, it is difficult to reliably inject the water-stopping injecting agent into a water-penetrating crack such as a crack or a joint in a large civil engineering concrete structure depending on the situation such as insufficient infiltration water.
[0009]
On the other hand, a water stopping method for a large concrete structure has also been proposed as in the following example.
[0010]
In this method, as shown in the outline of the construction shown in FIG. 7, the opening position 22 of the concrete wall surface 20 is changed while the opening position 22 is formed through the center of the void formed by the joint 21 (or crack). An injection hole 24 is formed so as to be located at the center 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 pressurized area 28 between the bottom 27 of the injection hole and the injection tool 26. The filler 29 is injected into the pressurized area 28 from the injection tool 26 at an injection pressure of 100 to 350 kg / cm ² . (FIGS. 7C and 7D)
[0011]
As the filler 29, a hydrophobic polyisocyanate or a hydrophilic polyisocyanate is used, and the filler 29 is injected up to 30 flowing out into the concrete wall surface 20 and is accumulated in the gap of the joint 21 (or crack). The water is discharged and the voids are replaced with the filler 29. (FIG. 7E)
[0012]
Then, the filler after the injection is cured and hardened in the gap of the joint (or crack) by being cured. At this stage, the injection tool 26 is removed from the opening 25 of the injection hole and the concrete is removed. Finishing 31 of the wall surface 20 is performed. (FIG. 7 (F))
[0013]
Therefore, environmental problems are feared by adding a catalyst or a curing accelerator which enhances the reaction rate to the hydrophobic polyisocyanate or the hydrophilic polyisocyanate which is a filler, and the following problems are caused in the method. Have
[0014]
(1) Even if an injection hole is provided at the center position of the concrete thickness, it is injected without closing the joints and cracks, so that it is difficult for the filler to enter the ground due to the action of infiltration water with pressure. Since it is easy to inject into the inside, even if it flows out into the room side, there are many cases where the inner part is not filled, and the filling and filling properties are not good.
(2) Polyurethane fillers such as hydrophobic polyisocyanate and hydrophilic polyisocyanate have low foaming pressure, low strength and poor adhesion and durability, so they form a highly durable and highly reliable water-stop adhesive. Difficult to re-leak. (For example, see Patent Document 2)
[0015]
[Patent Document 2]
Japanese Patent No. 3306375 (identification symbols “0009” to “0017” last line, FIGS. 1 and 3)
[0016]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has been proposed to prevent injecting and filling properties by ensuring foaming of a water-stopping material even for water leakage cracks such as cracks and joints in mass concrete. The present invention provides a high-pressure injection water-stopping method and a water-stopping material for a water-stopping material composed of a hydrophilic one-pack type polyurethane prepolymer which can establish a required performance of water adhesion and durability and can appropriately stop water.
[0017]
[Means for Solving the Problems]
The high-pressure injection water-stopping method for a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to the invention according to claim 1, wherein the water-stopping material mainly comprises a hydrophilic one-component polyurethane prepolymer for a concrete structure. In the waterproofing method, a watertight material injection hole is drilled at a predetermined angle from the concrete surface against a watertight crack in the concrete structure, and a closed chamber that holds the watertight material while crossing the watertight crack is provided. Then, after inserting a hollow reinforcing member filled with a high-molecular-weight water-absorbing polymer into a closed chamber to seal water leakage cracks in the concrete surface layer, an injection plug with a non-return valve is attached to the water-stopping material injection hole. Thereafter, a water-stop material mainly composed of a hydrophilic one-pack type polyurethane prepolymer is injected under pressure from an injection plug, and a predetermined amount is filled into the closed chamber and the water leakage crack. It is characterized by foaming due to chemical reaction with water and infiltration water and penetrating into water leakage cracks, and is also capable of injecting and filling water leakage cracks such as cracks and joints in large concrete structures. The required performance of durability and durability is established and water is stopped properly.
[0018]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to the second aspect of the present invention is the method of the high-pressure injection / water-stopping method according to the first aspect, wherein an injection confirmation hole for a water leakage crack is provided. It is characterized by drilling at a predetermined angle from the concrete surface to the concrete surface layer side from the water blocking material injection hole to the concrete surface layer side, in addition to the above function, reaction water and water from the concrete surface layer leakage cracks By observing the outflow of the waterproof material, it can be confirmed that the waterproof material is injected even during the leakage crack.
[0019]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to the third aspect of the present invention is the method of the high-pressure injection / water-stopping method according to the first or second aspect. It is characterized in that the reaction water is pressurized and injected from the water-stopping material injection hole into the water leakage crack and the closed chamber traversing the water leakage crack and wetted, and then sealed, and in addition to the above functions, the water leakage crack on the concrete surface layer is added. By observing the reaction water flowing out from the, it can be confirmed that the water stoppage material injection hole crosses the water leakage crack.
[0020]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to the invention of claim 4 is the method for water-stopping / water-injection according to any one of claims 1 to 3. It is characterized by pressurizing and injecting the reaction water into the water leak crack and the closed chamber traversing the water leak crack and then injecting the reaction water. This promotes penetration and hardening into the gap between the leak cracks, further strengthening the function of sealing the cracks.
[0021]
The high-pressure injection water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to the invention of claim 5 is the method according to any one of claims 1 to 4, wherein The material is injected into the closed chamber and the water leak crack at a pressure of 10 to 20 MPa. In addition to the above function, the water stop material before foaming is appropriately penetrated into the gap between the water leak cracks.
[0022]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to the invention of claim 6 is the method for stopping water-pressure in the high-pressure injection / water-stopping method according to any one of claims 1 to 5. It is characterized in that the filling amount of the material is determined in consideration of the expansion ratio exhibited by the chemical reaction with the infiltration water, and in addition to the above functions, the amount of the water-stopping material can be appropriately adjusted. it can.
[0023]
The water-stopping material according to the present invention is used in each of the above-described high-pressure injection water-stopping methods, and has a viscosity of 700 to 1400 mPa · s in a water-stopping material containing a hydrophilic one-pack type polyurethane prepolymer as a main component. It is characterized by improving the pouring and filling properties even for water leakage cracks in large concrete structures, and establishing water stoppage with excellent water stoppage adhesiveness and durability.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
The high-pressure injection water-stopping method for a water-stopping material composed of a hydrophilic one-pack type polyurethane prepolymer according to the present invention comprises 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 closed chamber that holds the water-stopping material in a state of crossing the water leakage crack, then, after inserting the hollow reinforcing member filled with the high molecular weight water-absorbing polymer into the closed chamber while closing the water leakage crack on the concrete surface layer, Attach an injection plug with a non-return valve to the water-stopping material injection hole, and then pressurize and inject a water-stopping material containing hydrophilic one-component polyurethane prepolymer as the main component from the injection plug to create a crack in the closed chamber and water leakage cracks. Filling a predetermined amount, the water stopping material is foamed by a chemical reaction with the high-molecular-weight water-absorbing polymer and the infiltration water, and is basically penetrated into the leak crack. At a predetermined angle from the concrete surface layer, drill a hole crossing the water leak crack on the concrete surface side from the water blocking material injection hole, or leak the water surface crack in the concrete surface layer into a water leak crack and a closed room crossing the water leak crack. After the reaction water is pressurized and injected from the water-stopping material injection hole and wetted and sealed, the water-stopping material is injected with the reaction water at a pressure of 10 to 20 MPa into the leak crack and the closed chamber traversing the leak crack. It is characterized in that the injection is performed under pressure, and the filling injection amount is determined in consideration of the expansion ratio exhibited by the chemical reaction with the infiltration water.
[0025]
Hereinafter, an embodiment of a high-pressure injection water stopping method according to the present invention will be described in detail with reference to the drawings.
[0026]
FIG. 1 is a view showing an embodiment in which a 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 structure for stopping water leakage due to cracks occurring on a concrete wall. 4 shows a step of drilling a material injection hole.
[0027]
The drilling of the water blocking material injection hole 2 performed from the inside of the concrete wall 1 is performed at an angle of about 60 degrees with respect to the discontinuous surface of the crack 3 and the water blocking hole 2 having a diameter of 10 mm crosses the discontinuous surface. The closed chamber 5 for holding the water blocking material 4 is formed. In the case of the present embodiment, the water blocking material injection hole 2 is formed 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 at a crack or a joint surface. On the other hand, they go in a zigzag pattern.
[0028]
The drilling depth of the drill is 100 mm or more deeper than the estimated distance to the discontinuous surface in consideration of reliably crossing the discontinuous surface.
[0029]
FIG. 1 (b) shows a state in which the injection plug with a check valve is mounted in the next step. After drilling the water-stopping material injection hole 2, the water-stopping material pouring hole 2 is provided as necessary. Concrete powder remaining in the inside is carefully removed by air blow.
[0030]
In this step, an injection plug 7 with a check valve is attached to the opening 6 of the water-stopping material injection hole 2. In this case, the hollow reinforcing member 12 in which the high-molecular water-absorbing polymer 11 is filled in the closed chamber 5 is used. And the surface of the crack 3 is closed with quick-setting cement 8 or the like. In this way, when the water-stopping material is injected from the opening 6, the water-stopping material is prevented from leaking from the cracks 3 of the concrete wall 1 to the inside. The water-stopping material, which has undergone volume expansion due to foaming generated while undergoing a chemical reaction with the contained water, is deeply filled to the outside of the concrete skeleton.
[0031]
The water supply to the high-molecular-weight water-absorbing polymer 11 is performed at the stage where the high-molecular-weight water-absorbing polymer 11 is filled in the hollow reinforcing member 12, or the high-molecular-weight water-absorbing polymer 11 is filled in the closed chamber 5. After the reinforcing member 12 is inserted, it can be considered that the water is supplied by the water 9 injected at a pressure of 5 to 10 MPa from the following injection plug 7 with a check valve. It can be said that it is more desirable to fill them.
[0032]
FIG. 1 (c) shows a pre-process for injecting the water-stopping material into the closed chamber and the uncontinuous surface of the crack.
In this step, water 9 is injected at a pressure of 5 to 10 MPa from the injection plug 7 with a check valve, and sufficient water is supplied between the closed chamber 5 and the uncontinuous surface of the crack 3 for foaming and hardening of the water-stopping material 4. 9 is supplied in advance.
[0033]
In addition, while confirming whether or not the water blocking material injection hole 2 is connected to the uncontinued surface of the crack 3, while draining infiltration water, at the same time as for confirming the filling state of the water blocking material, This will be described in another embodiment described later.
[0034]
FIG. 1 (d) shows a step of injecting the water-stopping material into the closed chamber and the uncontinuous surface of the crack.
In the present embodiment, the water-stopping material 4 is injected into the water-stopping 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 non-return valve is disposed. Move to 7 and perform high pressure injection sequentially. The water-stopping material 4 according to the present invention is composed of the high-molecular-weight water-absorbing polymer 11, the water 9 supplied to the crack 3 and the closed chamber 5 after all the injection is completed and the crack 3 and the closed chamber 5 are retained. Due to the chemical reaction with water permeating from the outside of the concrete body, it foams and expands volume before it hardens.
[0035]
Due to this volume expansion, the water stopping material 5 surely penetrates to every corner of the crack 3 outside the concrete frame, and can completely stop water in the entire area of the crack 3.
The hardening of the water-stopping material is started after the end of the volume expansion, but after the water-stopping material has hardened after a predetermined curing period, as shown in FIG. The concrete wall 1 is finished with a repair mortar or the like by breaking the part and removing the quick setting cement 8.
[0036]
As described above, in the high-pressure injection water-stopping method according to the present invention, the water-stopping material is injected at a high pressure and foaming generated by a chemical reaction with the high-molecular-weight water-absorbing polymer by sealing the inner surface of the cracked concrete wall. Due to volume expansion, the concrete will be filled deeply to the outside of the concrete body, and even for large concrete structures, it is required to be able to inject and fill water leakage cracks such as cracks and joints, as well as water-tight adhesion and durability. Performance has been established and appropriate water stoppage has been achieved.
[0037]
Next, another embodiment of the high-pressure injection water stopping method according to the present invention will be described.
The present embodiment is characterized in that a hole for confirming injection of water leakage cracks is drilled at a predetermined angle from the concrete surface layer so as to cross the water leakage crack on the concrete surface layer side from the water stoppage material injection hole. In addition to the function of the form, by observing that the reaction water and the waterproof material flow out from the leak crack on the concrete surface layer, it can be confirmed that the waterproof material is also injected into the leak crack. .
[0038]
FIG. 2 is an embodiment diagram in which an injection confirmation hole is drilled in a water leakage crack in a concrete wall, and FIG. 2 (a) shows a water blocking material injection hole and an injection confirmation hole in a crack generated in a concrete wall. The step of drilling is shown.
[0039]
In this embodiment, as in the above-described embodiment, the water-stopping material injection hole 2 is drilled, and the injection confirmation hole 10 is provided with the crack 3 located on the concrete surface layer side of the water-stopping material injection hole 2. It is opened at a predetermined angle from the concrete surface so as to cross the continuous surface. The injection confirmation hole 10 is opened at a position approximately 100 mm from the surface of the concrete wall 1 so as to cross the discontinuous surface, and an opening with the discontinuity surface of the injection confirmation hole 10 is opened in the concrete wall 1. It is formed at a position before the opening position of the water blocking material injection hole 2 with the discontinuous surface.
[0040]
This allows drainage of infiltration water that has penetrated into the discontinuous surface of the crack 3, and at the same time, confirms the filling state while improving the filling property when the water-stopping material 5 is injected from the water-stopping material injection hole 2. Is also possible.
[0041]
FIG. 2 (b) shows a state in which the injection plug with a check valve is mounted. However, as in the above-described embodiment, the concrete remaining in the water blocking material pouring hole 2 may be used as necessary. The powder is carefully removed by air blow.
[0042]
When the injection plug 7 with a backflow prevention valve is attached to the opening 6 of the water blocking material injection hole 2, the surface of the crack 3 is closed with quick-setting cement 8 or the like. By being open, the infiltration water is drained, and at the same time, as is confirmed in the next step, the water-stopping material injection hole 2 is connected to the uncontinuous surface of the crack 3 and the filling state of the water-stopping material is checked. You can check it.
[0043]
FIG. 2 (c) shows that the water-stopping material injection hole is connected to the crack-stopping surface, and the water-stopping material is filled when the water-stopping material is injected into the closed chamber and the crack-stopping surface. The process of checking a situation is shown.
[0044]
In this step, water 9 is injected at a pressure of 5 to 10 MPa from the injection plug 7 with a check valve, and the injected water 9 flows from the water blocking material injection hole 2 to the closed chamber 5 and the uncontinuous surface of the crack 3. And penetrates the entire area of the uncontinued surface, so that it also flows out of the injection confirmation hole 10. It can be confirmed that sufficient water was supplied in advance for foaming and hardening of the material 4.
[0045]
After this step, the water-stopping material 4 is injected from the water-stopping material injection hole 2 at a pressure of 10 to 20 MPa in the same manner as in the above embodiment. This is a reconfirmation of the connection with the unlucky side.
[0046]
That is, when the water-stopping material 4 is injected at a high pressure into the uncontinuous surface of the crack 3, the water-stopping material 4 first flows out from the injection confirming hole 10 which is more easily penetrated than the outside of the concrete frame on which the intrusion water pressure acts. As a result, it is confirmed that the unstoppable surface of the crack 3 is sufficiently filled with the waterproof material.
[0047]
In the present embodiment, when the outflow of the waterproof material 4 is confirmed, the injection confirming hole 10 is closed with a cotton, a wooden article, a rubber stopper, or the like so that the waterproof material 4 does not flow out. Is filled.
[0048]
Therefore, the water-stopping material 4 undergoes a chemical reaction and foams in the same manner as in the above-described embodiment, and at the same time, penetrates deeply to the outside of the concrete skeleton with a necessary sufficient volume expansion, and then hardens. Water will be established.
[0049]
Further, in another embodiment, the wet cracking is performed by injecting the reaction water from the water blocking material injection hole into the leak crack and the closed chamber traversing the leak crack by pressurizing the reaction water, and then the leak crack in the concrete surface layer is closed. In addition to the functions of the above embodiment, it is confirmed that the water stoppage material injection hole surely crosses the leak crack only by observing the reaction water flowing out from the leak crack in the concrete surface layer. it can.
[0050]
FIG. 3 is a view of another embodiment for confirming that a water blocking material injection hole crosses a water leakage crack in a concrete wall.
[0051]
In the present embodiment, the cracks 3 appearing on the surface of the concrete wall are not closed with quick-setting cement or the like, even though the water 9 is injected from the injection plug 7 with the check valve at a pressure of 5 to 10 MPa. Accordingly, the injected water 9 penetrates from the water blocking material injection hole 2 into the closed chamber 5 and the uncontinuous surface of the crack 3 and spreads over the entire area of the uncontinued surface, but the cracks 3 appearing on the surface of the concrete wall. Therefore, it can be confirmed that the water-stopping material injection hole 2 is connected to the discontinuous surface of the crack 3 and that sufficient water has been supplied in advance for foaming and hardening of the water-stopping material 4.
[0052]
The injection of the water-stopping material 4 performed after the above confirmation is performed after the cracks 3 appearing on the surface of the concrete wall are closed with quick-setting cement or the like, so that a predetermined amount of the water-stopping material 4 is cracked. When injected at high pressure into the discontinuous surface of No. 3, it foams while undergoing a chemical reaction with the high-molecular water-absorbing polymer 11 in the same manner as in the above embodiment, and is hardened after being deeply penetrated to the outside of the concrete body by volume expansion. Will be.
[0053]
As described above, the high-pressure injection / water-stopping method of a water-stopping material composed of a hydrophilic one-pack type polyurethane prepolymer according to the present invention is excellent in workability, injection-filling property, water-stopping adhesiveness and durability as described below. It has excellent water stopping effect of leaking cracks and can expect long-term water stopping durability, and at the same time, shortens the construction period and ensures a beautiful finish, so it can be applied to concrete walls with large wall thickness Can be easily compromised.
[0054]
{Circle around (1)} Since high pressure injection is performed by sealing the surface of cracks and joints, pressure can be transmitted to the water-stopping material without waste and can be injected into every corner of narrow cracks.
{Circle around (2)} The foaming hardening reaction that occurs while undergoing a chemical reaction with the high-molecular-weight water-absorbing polymer is slow, and penetration is performed by the foaming expansion pressure after high-pressure injection, so that water can be stopped at every corner of narrow cracks.
[0055]
Next, a water stopping material used in the high pressure injection water stopping method according to the present invention will be described.
The water-stopping material according to the present invention is characterized in that the water-stopping material having a hydrophilic one-pack type polyurethane prepolymer as a main component has a viscosity of 700 to 1400 mPa · s at normal temperature, and has a water leakage crack in a large concrete structure. In addition, the injection filling property is improved, and a water stoppage with excellent water stoppage adhesiveness and durability is established.
[0056]
The water-stopping material according to the present invention is mainly composed of a hydrophilic one-pack type polyurethane prepolymer. The hydrophilic one-pack type polyurethane prepolymer basically has a property of foaming and hardening by reacting with water. Has, for example, a polyalkylene glycol, a polyalkylene glycol alkyl ether, a polyalkylene glycol aryl ether, a polyalkylene glycol alkyl aryl ether, or a mixture of a polyalkylene glycol and an organic acid ester of a polyalkylene glycol, and an isocyanate group. It is a reaction product obtained by reacting the organic compound with the organic compound.
[0057]
Here, polyalkylene glycol, polyalkylene glycol alkyl ether, polyalkylene glycol aryl ether, and polyalkylene glycol alkyl aryl ether are polymers of ethylene oxide or propylene oxide or copolymers thereof, and have a molecular weight of 1,000 to 10,000. The organic acid ester of polyalkylene glycol is a polycarboxylic acid ester of the polyalkylene glycol. Specific examples of the polycarboxylic acid include maleic acid, adipic acid, and phthalic acid.
[0058]
The polyalkylene glycol, polyalkylene glycol alkyl ether, polyalkylene glycol aryl ether, polyalkylene glycol alkylaryl ether, or a compound having the isocyanate group that reacts with a mixture thereof with an organic acid ester of polyalkylene glycol, isocyanate A compound having at least two groups, specifically, tolylene diisocyanate, methylene diphenyl diisocyanate (polymethylene polyphenylene isocyanate), xylylene diisocyanate, hexamethylene diisocyanate, and the like. Among them, tolylene diisocyanate and methylene diphenyl diisocyanate are preferred for controlling the curing speed.
[0059]
The ratio of a polyalkylene glycol, a polyalkylene glycol alkyl ether, a polyalkylene glycol aryl ether, a polyalkylene glycol alkylaryl ether, or a mixture of a polyalkylene glycol and an organic acid ester of a polyalkylene glycol and an organic compound having an isocyanate group is as follows: The reaction is preferably carried out within the range of 1 to 10 isocyanate groups per 1 hydroxyl group. It is not preferable to react the former hydroxyl group at a ratio of less than one isocyanate group per one, since the degree of polymerization is lowered and the curability is inferior. On the other hand, if the number is more than 10, it is not preferable because the polymerization rate becomes high and it is difficult to control the curing rate.
[0060]
The reaction method of the hydrophilic one-pack type polyurethane prepolymer is a general known method, in which the hydrophilic one-pack type polyurethane prepolymer (2R-NCO) comes into contact with water (H ₂ O). A reaction formula for forming a cured product (R-NHCONH) while expanding and expanding a chemical reaction by generating carbon dioxide gas (CO ₂ ) by the following process is as follows.
_{2R-NCO + H 2 O →} R-NHCONH-R + CO 2
[0061]
In the present embodiment, the viscosity of the hydrophilic one-pack type polyurethane prepolymer is adjusted to 700 to 1400 mPa · s, and the viscosity is adjusted so that the following various characteristics can be exhibited.
[0062]
○ Specific gravity 1.16 g / cm ³
○ Apparent density 0.09 g / cm ²
○ Compressive strength 0.15 to 0.19 MPa
○ Bending strength 0.41 to 0.61 MPa
○ Closed cell rate 77.8 to 80.2%
○ Temperature-viscosity characteristics Figure 4
[0063]
1 shows a comparison between a conventional hydrophilic one-pack polyurethane prepolymer and a hydrophilic one-pack polyurethane prepolymer according to the present invention for general use and winter use.
[0064]
○ Foaming rate Fig. 5 General use (a), winter use (b)
Since the reaction of the hydrophilic one-pack type polyurethane prepolymer becomes faster as the temperature becomes higher, the foaming time becomes shorter as the temperature rises.
[0065]
○ Foaming ratio Fig. 6 For general use (a), for winter (b)
The expansion ratio of the hydrophilic one-pack type polyurethane prepolymer increases as the temperature increases, and the expansion ratio tends to decrease as the mixing ratio of water increases, and no difference due to water quality is observed.
[0066]
○ Tensile strength of cured product with reduced foaming 35-42 MPa
[0067]
The water-stopping material according to the present invention has a hydrophilic one-pack type polyurethane prepolymer as a main component and has the above-mentioned characteristics. Again, the water-stop material containing a hydrophilic one-pack type polyurethane prepolymer as a main component easily penetrates when injected at a high pressure from an injection plug with a non-return valve installed in the water-stop material injection hole. With this configuration, the water-stopping material can form a water-stopping adhesive system excellent in adhesiveness to a wet surface, strength characteristics of a cured product, and tensile strength.
[0068]
As described above, the present invention has been described in detail based on the embodiment. However, the high-pressure injection water-stopping method and the water-stopping material of the water-stopping material made of the hydrophilic one-component polyurethane prepolymer according to the present invention are described in the above-mentioned embodiment. It is needless to say that the present invention is not limited to the above, and that various changes can be made by applying known ones at the time of filing without departing from the gist of the present invention.
[0069]
【The invention's effect】
The high-pressure injection / water-stopping method of a water-stopping material comprising a hydrophilic one-component polyurethane prepolymer according to claim 1, wherein the water-stopping material mainly comprising the hydrophilic one-component polyurethane prepolymer is injected into a concrete structure. In the hydraulic construction method, a watertight material injection hole is drilled at a predetermined angle from the concrete surface with respect to the water leakage crack of the concrete structure to form a closed chamber that holds the waterstop material in a state of crossing the water leakage crack, and then After closing the leak cracks in the concrete surface layer and inserting a hollow reinforcing member filled with a high-molecular-weight water-absorbing polymer into the closed chamber, attach the injection plug with a check valve to the water-stopping material injection hole, and then from the injection plug A water-blocking material containing a hydrophilic one-pack polyurethane prepolymer as a main component is injected under pressure, and a predetermined amount is filled into the closed chamber and the water leak crack. It is characterized by the fact that it penetrates into the water leakage cracks while foaming by chemical reaction with water, so it has an excellent water stopping effect of cracks leaking as follows, and long-term water stopping durability can be expected In addition, the construction period is shortened, the beautiful finish is secured, and the construction on the concrete skeleton with large wall thickness can be easily modified, and the required performance of injection filling, waterproofing adhesiveness and durability is established and water is stopped properly. The effect that can be exhibited.
[0070]
{Circle around (1)} Since high pressure injection is performed by sealing the surface of cracks and joints, pressure can be transmitted to the water-stopping material without waste and can be injected into every corner of narrow cracks.
{Circle around (2)} The foaming hardening reaction that occurs while undergoing a chemical reaction with the high-molecular-weight water-absorbing polymer is slow, and penetration is performed by the foaming expansion pressure after high-pressure injection, so that water can be stopped at every corner of narrow cracks.
[0071]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to the second aspect is the high-pressure injection / water-stopping method according to the first aspect, wherein the injection confirmation hole for the leak crack is formed on a concrete surface layer. It is characterized by drilling at a predetermined angle from the water-stopping material injection hole to the concrete surface side beyond the water leakage crack, so that in addition to the above effects, reaction water and water stoppage due to the water leakage crack on the concrete surface layer By observing the outflow of the material, the effect of confirming that the water-stopping material has been injected even during the leak crack is exhibited.
[0072]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to claim 3 is the method for water-tight / water-injection / waterproofing according to claim 1 or 2, It is characterized by reacting water into the closed chamber across the crack and the leak crack by pressurizing the reaction water from the water-stopping material injection hole and sealing it after wetting.Therefore, in addition to the above effects, the reaction from the leak crack on the concrete surface layer By observing the outflow of water, the effect of confirming the crossing of the water blocking material injection hole against the leak crack is demonstrated.
[0073]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to claim 4 is the method for high-pressure injection / water-stopping according to any one of claims 1 to 3, wherein the water-stopping material is leaked. Since the reaction water is pressurized and then injected into the closed chamber crossing the crack and the water leak crack, in addition to the above effects, the generation of the foaming pressure and the volume expansion of the water blocking material is promoted. This has the effect of penetrating and hardening into the gaps between the water leakage cracks and further strengthening the function of sealing the cracks.
[0074]
The high-pressure injection / water-stop construction method for a water-stopping material composed of a hydrophilic one-pack type polyurethane prepolymer according to claim 5, wherein the water-stopping material according to any one of claims 1 to 4, Since it is characterized by being injected into the closed chamber and the water leak crack at a pressure of 10 to 20 MPa, in addition to the above-mentioned effects, the water stopping material before foaming has an effect of being able to appropriately penetrate into the gap between the water leak cracks. I have.
[0075]
The high-pressure injection / water-stopping method for a water-stopping material made of a hydrophilic one-pack type polyurethane prepolymer according to claim 6 is the same as the high-pressure injection / water-stopping method according to any one of claims 1 to 5, except that the water-stopping material is filled. Since the injection amount is determined in consideration of the foaming ratio exerted by the chemical reaction with the infiltration water, in addition to the above effects, the effect of appropriately adjusting the amount of the waterproof material is exhibited. ing.
[0076]
The water-stopping material according to the present invention is used in each of the above-described high-pressure injection water-stopping methods, and has a viscosity of 700 to 1400 mPa · s in a water-stopping material containing a hydrophilic one-pack type polyurethane prepolymer as a main component. As a result, it is possible to improve the filling and filling properties to prevent water leakage cracks in large concrete structures, and to establish a water stoppage with excellent water stoppage adhesiveness and durability. It has the effect of forming a water-stop bonding system having excellent strength characteristics and tensile strength.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment in which a high-pressure injection waterproofing method according to the present invention is applied to a concrete wall having a large wall thickness. FIG. 2 is another embodiment in which a high-pressure injection waterproofing method according to the present invention is applied to a concrete wall having a large wall thickness. FIG. 3 is another embodiment in which the high-pressure injection water-stopping 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 water-stopping material according to the present invention. 5: Foaming rate diagram of water-stopping material according to the present invention [Fig. 6] Foaming magnification diagram of water-stopping material according to the present invention [Fig. 7] Conventional high-pressure injection water-stopping work diagram for concrete wall with large wall thickness [Explanation of symbols]
1 concrete wall, 2 water blocking material injection hole, 3 crack, 4 water blocking material,
5 closed chamber, 6 opening, 7 injection plug with check valve,
8 quick setting cement, 9 water, 10 injection confirmation hole,
11 high molecular 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 pressurized area, 29 filler, 30 outflow,

Claims (7)

Injection of water-blocking material mainly composed of hydrophilic one-pack type polyurethane prepolymer into concrete structure In the water-stopping method, cut out the water-blocking material injection hole at a predetermined angle from the concrete surface layer against water leakage cracks in the concrete structure Drilling to form a closed chamber for retaining the water blocking material in a state of crossing the water leak crack, and then closing the water leak crack on the concrete surface layer and filling the closed chamber with a high molecular weight water-absorbing polymer. After inserting the member, an injection plug with a check valve is attached to the water-stopping material injection hole, and then a water-stopping material mainly composed of a hydrophilic one-component polyurethane prepolymer is injected under pressure from the injection plug. A hydrophilic material characterized in that a predetermined amount is filled in the closed chamber and the water leakage crack, and the water stopping material is penetrated into the water leakage crack while being foamed by a chemical reaction between the high molecular water-absorbing polymer and the infiltration water. High pressure injection water stop method of water stopping material comprising one-component polyurethane prepolymer. 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 to the concrete surface layer side of the water blocking material injection hole so as to cross the water leakage crack. High-pressure injection water-stopping method of water-stop material composed of one-component polyurethane prepolymer. 3. The leaked crack in the concrete surface layer is sealed after being wetted by injecting the reaction water into the leaked crack and the closed chamber traversing the leaked crack by injecting the reaction water from the water blocking material injection hole, and closing the leaked crack. 3. A high-pressure injection / water-stopping method for a water-stopping material comprising the hydrophilic one-pack type polyurethane prepolymer according to item 1. The hydrophilic liquid according to any one of claims 1 to 3, wherein the water-stopping material is pressure-injected after the reaction water is pressure-injected into the water leak crack and the closed chamber traversing the water leak crack. High-pressure injection water-stop method of water-stop material composed of polyurethane mold prepolymer. The water-stopping material comprising a hydrophilic one-pack type polyurethane prepolymer according to any one of claims 1 to 4, wherein the water-stopping material is injected into the closed chamber and the water leak crack at a pressure of 10 to 20 MPa. High pressure injection water stop method. The hydrophilic one-pack type polyurethane according to any one of claims 1 to 5, wherein the filling amount of the water-stopping material is determined in consideration of an expansion ratio exerted by a chemical reaction with the infiltrating water. High-pressure injection water-stop method of water-stop material made of prepolymer. The high-pressure injection water-stopping method according to any one of claims 1 to 6, wherein the water-stopping material is mainly composed of a hydrophilic one-pack type polyurethane prepolymer and has a viscosity of 700 to 1400 mPa · s. Water-stopping material mainly composed of a hydrophilic one-pack type polyurethane prepolymer for use in

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