JP6325870B2 - Water stop method - Google Patents

Description

  The present invention relates to a water stopping method for stopping water leakage of an artificial structure in the presence of water. In detail, water stoppage treatment of water leakage points of artificial structures such as water storage containers and water tanks is simple, safe and effective with water contained without draining water in these artificial structures. It relates to the water stop method to be performed automatically.

  Conventionally, grout materials such as cement paste and mortar, and waterstop materials such as water glass and organic polymer compounds have been used for repairing cracks and voids in artificial structures where water leakage is observed. These water-stopping materials are used by methods such as applying or injecting water into cracks and gaps in water leakage points, but artificial surfaces that constantly come into contact with water, such as water storage containers, water tanks, or floor surfaces for drainage etc. In order to stop the water leakage point of a structure, it is common to drain the stored water or stop the inflow of drainage, and make the water stop in the artificial structure before performing the water stop treatment. .

  However, when artificial structures such as containers and water tanks are installed in narrow spaces, sufficient work space cannot be secured, or when water stoppage is urgently required due to an accident or disaster, etc. In situations where it is difficult to discharge the water stored in the artificial structure or move it to another place, the water stop treatment should be performed with the water stored in the artificial structure such as a container or water tank. Is required. In addition, in a state where water is stored, since it is difficult to confirm, the location of water leakage may be unclear.

  If the grout material is used with water in the artificial structure, the injected grout material will dissipate into the water and the water leakage location will not be filled with sufficient amount, or the filling state will be uneven and the water leakage will be The location may not be completely blocked and a sufficient water stop effect may not be exhibited. In addition, the ionic component in the grout material dissolves in water and flows out, the strength after curing decreases, and a sufficient water stop effect may not be exhibited.

  Therefore, as a grout material improved so as to be more suitable for use in water, for example, Patent Document 1 discloses a grout material in which fly ash and a specific surfactant are blended in cement. However, the method of using the grout material disclosed in Patent Document 1 is a method of pumping using a hose, and not only a hose but also a place for installing a pump for pumping is required. When it is difficult to secure a sufficiently large work space such as an artificial structure on the site, there is a risk that the work cannot be performed safely. On the other hand, when trying to perform a water-stop treatment simply by hand, etc. without using a large-scale device as in the case of pumping, the specific gravity is large and heavy because the grout material is mainly cement or mortar. There is a problem that workability is inferior.

  In addition, after curing, the whole becomes one lump, but the cured product of grout material is hard and strong, so it is difficult to remove it by cutting it small, for the purpose of redoing the water stop treatment or temporarily stopping water There is also a problem that it is difficult to use.

  A water-stopping material composed of organic polymer compounds, which is known as an underwater-curing water-stopping material that gradually cures even in the presence of water, is known from monomers and oligomers that cause a crosslinking reaction and a crosslinking agent. A two-component type is generally used in which two kinds of curing agent materials are mixed just before water stop work. As such a two-part water-stopping material, for example, Patent Document 2 discloses a liquid A comprising a curing accelerator selected from amino compounds and a metal salt aqueous solution having a specific gravity of 1 or more, a diisocyanate, and a bifunctional polyalkylene. A water-stopping material composed of two liquids with a liquid B containing a urethane prepolymer reacted with glycol is disclosed.

  A water-stopping material made of an organic polymer compound as described in Patent Document 2 is good in terms of workability because it has a smaller specific gravity and lighter than a grout material. However, the polymer compound may shrink with the progress of the cross-linking reaction, and at the time when the curing is completed, the leaked portion such as cracks and voids is not completely filled with the cured product, and a gap is formed. There is a risk of water leakage again. Moreover, since the hardened | cured material formed after hardening reaction is not so soft that it can cut | judge easily, there also exists a subject that the use for the purpose of redoing a water stop process again or temporarily stopping water is also difficult.

JP 2008-037727 A JP-A-7-097566

  The present invention provides a water stop treatment that can easily, safely, and effectively perform a water stop treatment of artificial structures such as containers and water tanks for storing water in a state where water enters these artificial structures. A method is provided. In particular, when artificial structures such as water storage containers and water tanks are installed in narrow spaces, or due to accidents or disasters, sufficient work space cannot be secured, and artificial structures Even if it is difficult to discharge the water stored in the tank or move it to another place, the water leaks in an artificial structure such as a container or aquarium, and the location of the leak is unclear. Even in such a case, it is an object to provide a water stop method capable of performing a water stop treatment in a simple, safe and effective manner.

  In order to solve the above-mentioned problems, the present inventors diligently studied, and by using a two-component underwater curable adhesive and a water-absorbing resin, water leakage can be easily, safely and effectively in the presence of water. The present inventors have found that the water can be stopped at the point and have reached the present invention.

That is, the present invention is as follows.
(1) A water-stopping method for stopping water leakage in an artificial structure that stores water in a state where water is contained, the water-absorbing resin powder, and the main component and curing of a two-component underwater curable adhesive The water-absorbent resin powder is prepared by mixing a water-repellent agent with a water-repellent agent and then pouring the water-stopper material into a leaking portion of an artificial structure and swollen with the two-component underwater curable adhesive and water. Water-stopping method characterized in that water leakage is stopped by curing in water in an integrated state.
(2) The water stop method according to (1), wherein the water stop material is poured upstream of a flow path flowing into the water leak point of the artificial structure, and the water stop material is poured into the water leak point of the artificial structure. .
(3) The water stop method according to (1) or (2), in which, when the water leak location of the artificial structure is unknown, the water stop material is introduced into a location where water leak is expected.
(4) The ratio of the total amount of the main component and the curing agent of the two-component underwater curable adhesive constituting the water-stopping material and the water-absorbent resin powder is in the range of 15: 1 to 50: 1 by weight ratio. The water stopping method according to any one of the above (1) to (3).
(5) The water stopping method according to any one of (1) to (4), wherein the base resin constituting the main component of the two-component underwater curable adhesive is an epoxy resin.
(6) The water stopping method according to any one of (1) to (5), wherein the water-absorbent resin powder is crosslinked sodium polyacrylate.

  In the water-stopping method of the present invention, as the water-stopping material, a water-stopping material is prepared by mixing a water-absorbing resin powder and a two-component underwater curable adhesive, and the prepared water-stopping material is poured into water. Water leakage can be stopped with a simple operation. Moreover, even if the water stop location is unknown, it is only necessary to put it in a location where water leakage is expected.

  The water-stopping material thrown into the water causes the water-absorbing resin powder to absorb water first because the reaction between the main agent and the curing agent constituting the two-component underwater-curing adhesive proceeds slowly. The whole water material swells and the volume increases. Therefore, the water-stopping material that has entered the cracks and gaps in the water leakage portion swells, so that the cracks and gaps are completely filled with the composition. After that, the two-component underwater curable adhesive is cured, and the cracks and voids at the water leakage location are completely filled with a cured product in which the underwater curable adhesive and the water absorbent resin are integrated. Can be stopped.

  That is, according to the water stopping method of the present invention, mixing is easy because the main agent and the curing agent are liquid, which is an advantage of the two-component underwater curing adhesive composed of the main component of the organic polymer compound and the curing agent. In addition, it is lighter and easier to handle than grout materials, so that the water stop effect can be enhanced while maintaining the advantage of excellent workability.

  Furthermore, in the present invention, the water-stopping material thrown into the water is cured in a state where the whole is integrated, but the water-absorbing resin powder which has absorbed water and swelled to increase its volume is a two-component underwater curing type. It has a structure in which an adhesive is bonded. Therefore, the cured product formed from the waterstop material is softer than a cured product formed from a grout material, a known organic two-component underwater curable adhesive composed only of the main agent and the curing agent. Since it becomes hardened | cured material and can be collect | recovered easily, it becomes possible to implement removal of hardened | cured material other than the water leak location after completion | finish of a water stop treatment, and water stop treatment again.

  In the water-stopping method of the present invention, the water-stopping material is composed of a water-absorbent resin powder, a main component of a two-component underwater curable adhesive, and a curing agent. The method of mixing the water-absorbent resin powder and the two-component underwater curable adhesive (hereinafter referred to as “underwater curable adhesive”) is not particularly limited. For example, 1) a method of adding a mixture of an underwater curable adhesive main agent and a curing agent to the water absorbent resin powder and mixing them, and 2) either the main agent or the curing agent to the water absorbent resin powder. 3) A method in which the remaining one is added and mixed, 3) A method in which the main agent and the curing agent are added separately to the water-absorbent resin powder, and 4) A method in which the main component of the underwater curable adhesive is mixed. There is a method of adding a water-absorbent resin powder to a mixture with a curing agent and mixing them.

  Especially, the method of mixing these rapidly after adding the mixture which mixed the main ingredient and hardening | curing agent of the underwater hardening type adhesive agent beforehand to a water absorbent resin powder is preferable. The addition of the mixture may be either batch addition or divided addition. A highly uniform cured film can be formed by mixing the main component of the underwater curable adhesive and the curing agent as uniformly as possible.

  The ratio of the underwater curable adhesive and the water absorbent resin powder varies depending on the type of the underwater curable adhesive and the water absorbent resin powder to be used, and is not particularly limited, but is 15: 1 to 50 by weight. Is preferably in the range of 20: 1 to 40: 1. When the ratio of the water-absorbent resin powder is less than the above range, the water-absorbent resin powder has a poor effect of absorbing water and swelling, so that the water-stopping material that has entered the cracks or gaps in the water leakage point is It becomes difficult to express the water-stop effect that seals the gap. On the other hand, when the ratio of the water-absorbing resin powder exceeds the above range, when the water-absorbing resin powder swells by absorbing water, the formation of the cured film of the underwater curable adhesive is hindered. Insufficient formation makes it difficult to produce a water stop effect.

  As the base resin constituting the main component of the underwater curable adhesive, a known resin such as an epoxy resin or a urethane resin can be used. Among these, an epoxy resin is preferable because there is little variation in the curing reaction in water. Examples of the epoxy resin include diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, diglycidyl ether of hydrogenated bisphenol A, and alkylene oxide adducts of bisphenols having two or more epoxy groups in the molecule. Examples thereof include diglycidyl ether and phenol novolac epoxy resin.

  The form of the main component of the underwater curable adhesive is not particularly limited, and may be putty or liquid at room temperature, but liquid is preferable in terms of ease of mixing. Examples of commercially available products include three bond TB2083 (manufactured by Three Bond Co.) and bond E380 (manufactured by Konishi Co., Ltd.) for putty-like types, and epoch fix cold embedding resin (manufactured by Struers), Sea Cadure, etc. 53 (made by Nippon Seika Co., Ltd.).

  The curing agent for the underwater curable adhesive may be one selected from aliphatic amines, aromatic amines, alicyclic amines, polyamides, amine-modified polyamides, etc. that are putty-like or liquid at room temperature. A mixture of two or more is preferred.

  The ratio of the main agent and the curing agent is sufficient in the amount usually used as an underwater curable adhesive, and the active hydrogen equivalent of the amino group is 0.5 to 2.5 equivalents relative to the epoxy group of the epoxy resin of the main agent. It is preferable to use so that it becomes.

  The water-absorbing resin powder is not particularly limited as long as it is a resin powder that swells by absorbing water, but, for example, a crosslinked polyacrylate, a cross-linked product of starch and sodium acrylate graft copolymer. Saponified graft copolymers of starch and acrylonitrile, crosslinked polyalkylene oxides, and the like. Among these, crosslinked sodium polyacrylate is preferable because of its excellent water absorption.

  The water-absorbent resin powder preferably has a particle size of 100 μm to 1,000 μm, particularly preferably composed of a fine powder of 100 to 500 μm. If the particle size is too small, it becomes difficult to mix uniformly with the underwater curable adhesive, such as lumps. If the particle size is too large, it will be difficult to enter fine voids and holes, thus reducing the water stop effect. Tend. If it is 500 μm or less, the cured film formed by the underwater curable adhesive is less likely to be destroyed by the water-absorbent resin that has absorbed water and swelled and increased in volume, so that the water-stopping effect can be enhanced. Further, the size may be appropriately adjusted in accordance with the shape of the gap or hole.

  In order to prevent the prepared water-stopping material from becoming hard to express the water-stopping effect due to the progress of the curing of the underwater curable adhesive, it is desirable that the prepared water-stopping material is immediately put into the water leak point of the artificial structure after the preparation. The curing time can be adjusted by the type and amount of the curing agent.

  In the water stop method of the present invention, the form in which the water stop material is poured into water can be appropriately selected according to the viscosity of the water stop material. For example, when the viscosity of the water-stopping material is relatively low and has fluidity, it is preferable to add it by pouring into water. If the water-stopping material has a high viscosity and does not show fluidity, such as a putty, it is preferable to cut off an appropriate amount of the water-stopping material and form a dumpling into the water.

  Moreover, the method of throwing in the water stop material can be appropriately selected according to the structure of the artificial structure. For example, in the case of an artificial structure such as a container or a water tank having a leak point and having a flow path or a pipe that can put water into the artificial structure, the flow path or The water-stopping material of the present invention can be poured into the artificial structure by pouring the water-stopping material of the present invention upstream of the pipe. At that time, water may be allowed to flow through the flow path and the pipe, and the water stop material of the present invention may be put into the artificial structure together with the water. In addition, if the artificial structure having a lid on the upper portion can secure a space for opening the lid, the lid can be opened and the water-stopping material of the present invention can be introduced. Furthermore, by pouring a water-stopping material upstream of the water leakage location, the poured water-stopping material spreads in the artificial structure. Therefore, even if the leak location is unknown (specification is difficult), the leak location can be stopped by curing a part of the poured water stop material in a range including the leak location.

  In the case where the water-stopping material has a high viscosity and does not exhibit fluidity, the solvent can be diluted to a state that exhibits appropriate fluidity to dilute the water-stopping material, and then poured into water by the above method. The solvent used for dilution is not particularly limited as long as it is a solvent that dissolves the main component of the underwater curable adhesive, and for example, aromatic hydrocarbons such as toluene and xylene can be used.

  The water-stopping material may be added with a filler such as calcium carbonate, talc, clay, carbon black, or a coloring pigment, if necessary.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely using an Example, this invention is not limited only to a following example.

Example 1
As a two-component underwater curable adhesive, a trade name “Three Bond TB 2083” (manufactured by Three Bond Co., Ltd.) comprising an epoxy resin-based main agent and a polyamidoamine-based curing agent was used.
As the water-absorbent resin, commercially available powdered crosslinked sodium polyacrylate having a particle size of about 500 μm (the water absorption amount per 1 g of the water-absorbent resin was 350 g) was used.
After mixing 15 g of the main component of the two-component underwater curable adhesive and 15 g of the curing agent, the mixture was added to 0.855 g of the water-absorbent resin powder and mixed to prepare a putty-like waterstop material.

Insert a rubber plug (about 2 cm high) with a hole with a diameter of about 5 mm into the lower end of an acrylic cylinder with a diameter of about 5 cm, and insert another rubber plug into the lower portion of the rubber plug about 1 cm. Then, after sealing the hole, a cylindrical container containing 1 L of tap water was prepared, and the entire amount of the putty-like water-stopping material was put into tap water. The waterstop material gradually dropped in the water.
After 15 hours, the rubber plug inserted at the bottom of the rubber plug hole was removed, but no leakage of tap water in the acrylic tube was observed, and the hole portion of the rubber plug did not get wet. . In addition, tap water was poured from the top of the tube, but no leakage of tap water was observed. In addition, the water-stopping material that was input was cured in the shape of the hole of the rubber plug.

(Examples 2 to 6)
Using the two-component underwater curable adhesive and the water-absorbent resin powder used in Example 1, 15 g of the main agent and 15 g of the curing agent were mixed. As shown in Table 1, a putty-like waterstop material was prepared in the same manner as in Example 1, except that the amount of the water-absorbent resin powder to be added was changed.
Next, in the same manner as in Example 1, a putty-like water-stopping material was put into an acrylic tube containing tap water, and after 15 hours, the rubber plug inserted in the lower part of the rubber plug hole was removed. Further, tap water was poured from the upper part of the cylinder to observe the state of water leakage, and the water stopping effect was determined according to the following criteria.
○: No tap water leaked.
Δ: Tap water started to ooze out and the rubber plug was observed to get wet.

  The above results are summarized in Table 1.

(Example 7)
ThreeBond TB2083 (manufactured by ThreeBond) was used as a two-component underwater curable adhesive. As the water-absorbent resin, commercially available powdered crosslinked sodium polyacrylate having a particle size of about 500 μm (the water absorption amount per 1 g of the water-absorbent resin was 350 g) was used.
After mixing 15 g of the main component of the two-component underwater curable adhesive and 15 g of the curing agent, the mixture was added to 0.855 g of the water-absorbent resin powder and mixed to prepare a putty-like waterstop material.
All of the putty-like water-stopping material was put into an acrylic container containing 0.7 liters of tap water and left for 15 hours. As a result, the inside of the container was completely filled with the water stop material. The waterstop material was uniformly dispersed.

(Example 8)
As a low-viscosity type two-component underwater curable adhesive, a trade name “Epofix” (manufactured by Struers) consisting of an epoxy resin main agent and a curing agent was used. The same water-absorbing resin as in Example 7 was used, and a pasty water-stopping material was prepared at the same ratio as in Example 7.
The pasted water-stopping material was put in an acrylic container containing 0.7 liters of tap water, and left for 15 hours. As a result, the inside of the container was completely filled with the water stop material. The waterstop material was uniformly dispersed.

Example 9
In Example 8, an experiment was performed in the same manner as in Example 8 except that artificial seawater was used instead of tap water. As a result, the water-absorbing property of the water-stopping material that was input was lowered, but the water-absorbing resin powder particles were adhered to each other.

  According to the water stop method of the present invention, since the water stop treatment of an artificial structure such as a container or a water tank in which water is stored can be easily performed, the water stop treatment of an artificial structure installed in a narrow place or It is suitable for water stop treatment of artificial structures in the event of an accident or disaster.

Claims (6)

  A water stopping method for stopping water leakage of an artificial structure that stores water in a state where water is contained, comprising a water absorbent resin powder, a main component of a two-component underwater curable adhesive, and a curing agent. After preparing the water-stopping material by mixing, the water-stopping material is thrown into the leaked portion of the artificial structure, and the two-component underwater curable adhesive and the water-absorbent resin powder swollen with water are integrated. The water-stopping method is characterized in that the water leakage portion is stopped by curing in water in a state of being converted into water.   The water stop method according to claim 1, wherein the water stop material is poured upstream of a flow path that flows into the water leak location of the artificial structure, and the water stop material is introduced into the water leak location of the artificial structure.   3. The water stop method according to claim 1, wherein when the water leak location of the artificial structure is unknown, the water stop material is introduced into a location where water leak is expected.   The ratio of the total amount of the main component and the curing agent of the two-component underwater curable adhesive constituting the water-stopping material and the water-absorbent resin powder is in the range of 15: 1 to 50: 1 by weight ratio. The water stop method in any one of Claims 1-3.   The water-stopping method according to any one of claims 1 to 4, wherein the base resin constituting the main component of the two-component underwater curable adhesive is an epoxy resin.   The water-stopping method according to any one of claims 1 to 5, wherein the water-absorbent resin powder is cross-linked sodium polyacrylate.