JP2003201711A - Water stop material for anchor and cutoff method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water stop material for an anchoring method having excellent cutoff performance even to cement-containing water, seawater or the like and capable of being installed by a simple method, and also provide a cutoff method. <P>SOLUTION: A tape-shaped and/or beltlike structure in which a water- absorbing resin is sealed into an external facing material partially having water permeability by the quantity of weight per a square meter of 500-20,000 g/m<SP>2</SP>and/or a water stop material for an anchor in which the water-absorbing resin is sealed into a doughnut-shaped or lotus root-shaped external facing material by 0.001-1 g/cm<SP>3</SP>; and the cutoff method using the water stop material are provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stop material for anchors and a water stop method for strengthening the ground, and more particularly to a water stop material and a water stop method for sealing a gap between anchor ropes.

[0002]

2. Description of the Related Art In the fields of construction and earth construction, an anchor construction method using an anchor steel wire is generally performed in order to strengthen slopes and underground ground and prevent collapse of walls. In this anchor construction method, an excavation hole is opened in a slope or underground ground, mortar or concrete is poured into the hole, and one end of the anchor steel wire is inserted and hardened therein. After that, by fixing the hardened anchor steel wire in a tensioned state, a stress against the tension is generated to prevent the underground ground and the wall from collapsing. However, when the excavation opening is opened, groundwater often flows out from the ground, and when groundwater flows out, the groundwater flows out and the soil and sand particles in the ground gradually flow out. There was a problem that the effect of the anchor itself was lost due to the formation of cavities in the peripheral area such as concrete in the ground where the steel wire was fixed for a long time. In order to solve this problem, it is necessary to prevent the drainage of groundwater etc. from the excavation hole containing the anchor steel wire,
As a water stop method for this, a cloth bag equipped with a mortar inlet is put in the gap between the excavation hole and the anchor steel wire, and the mortar is pressed into the cloth bag to fill the gap and harden the mortar. A method of stopping water is generally performed (for example, see Patent Document 1).

[0003]

[Patent document] Japanese Patent Laid-Open No. 63-130821

[0004]

However, since the anchor steel wire is used in a state in which about 3 to 15 wires are bundled for the strength at the time of tension, the excavation hole and the anchor steel wire are expanded by the expansion of the cloth bag. Although the gap with the outer periphery of the wire can be filled, the gap between the anchor steel wires cannot be filled, and there was a problem that water blocking was insufficient. Furthermore, in this method, water is stopped by press-fitting and hardening the mortar, but the time when the anchor steel wire is usually pulled is after the press-fitted mortar has set, so when the anchor steel wire is pulled. Due to the movement of the steel wire by several cm to several tens of cm, the hardened mortar is cracked or a new gap is formed, and there is a problem that water leakage occurs again.

[0005]

Means for Solving the Problems As a result of intensive investigations by the inventors of the present invention to obtain a water-stopping material having the above-mentioned problems improved, a tape-shaped and / or strip-shaped water-stopping water-containing resin containing a predetermined amount of a water-absorbent resin is obtained. If water and / or doughnut-shaped or lotus root-shaped water stopping material is used, not only the above problems can be prevented but also almost complete water stopping is possible, and it is also possible to flexibly deal with the movement of the anchor steel wire. The inventors have found that and reached the present invention. That is, the present invention is the following (1) to (5). (1) An anchor composed of a tape-shaped and / or band-shaped structure in which a water-absorbent resin is enclosed in an exterior material having at least a part of water permeability in a basis weight of 500 to 20,000 g / m ^2. Water-stopping material; (2) Comprising a water-stop structure having one or more anchor steel wire insertion lumens; the structure having the lumen at least partly made of a water-permeable material (3) At least a part of the water-stopping material for anchor, wherein 0.001 to 1 g / cm ³ of water-absorbent resin is enclosed in the hollow part of the exterior material which is a columnar hollow body per the maximum inner volume of the hollow part; Made of water-permeable material, length 1-50c
Anchor steel consisting of a sheet-shaped waterproof structure in which a water-absorbent resin is enclosed in a sheet-shaped exterior material having a width of 0.5 to 30 cm and a basis weight of 500 to 20,000 g / m ^2. (4) Water absorption of 0.001 to 1 g / cm ³ per maximum volume of the hollow part in a hollow columnar exterior material at least a part of which is formed of a water-permeable material. An anchor steel wire gap-sealing core-type water-stopping material, which is composed of a columnar water-stopping structure in which a water-soluble resin is encapsulated; (5) Between a cutting opening for an anchor and an anchor steel wire and / or an anchor rope. The water-stopping method for anchors, characterized in that the above-mentioned water-stopping material or a combination of two or more thereof is disposed in the gap.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a swelling / expanding agent for stopping water, a water-absorbent resin is enclosed in an exterior material at least a part of which has water permeability. Examples of the water absorbent resin used in the present invention include anionic water absorbent resins such as carboxylic acid (salt) water absorbent resins, sulfonic acid (salt) water absorbent resins, nonionic water absorbent resins, and cationic water absorbent resins. Can be mentioned. Examples of the carboxylic acid (salt) -based water-absorbent resin include crosslinked products of poly (meth) acrylic acid (alkali metal salt) and crosslinked products of starch / (meth) acrylic acid graft polymer (alkali metal salt). be able to.

As the sulfonic acid (salt) type water absorbent resin,
(Meth) acrylamide-N-alkyl (C1-C1
5) Crosslinked product of sulfonic acid and / or its alkali metal salt, crosslinked product of alkyl (meth) acrylate (C1-5) sulfonic acid (alkali metal salt), crosslinked product of styrene sulfonic acid (alkali metal salt) And the like; and a cross-linked product of a copolymer of these sulfonic acid-based polymer constituents and a carboxylic acid-based monomer represented by (meth) acrylic acid (alkali metal neutralization salt) and the like.

As the nonionic water-absorbing resin, (meth)
Acrylamide polymer crosslinked product, vinyl alcohol polymer crosslinked product, ethylene oxide polymer crosslinked product, hydroxyalkyl (C2-5) (meth) acrylate crosslinked polymer, polyethylene glycol (PEG number average molecular weight: 200-4, 000) (meth) acrylate polymer cross-linked product, methoxy PEG (number average molecular weight of PEG: 20
0-4,000) (meth) acrylate cross-linked polymer, starch cross-linked product, hydroxyethyl cellulose cross-linked product: and constituents of these nonionic polymers and carvone represented by (meth) acrylic acid (alkali metal neutralization salt) Examples thereof include crosslinked products of copolymers of acid (salt) monomers.

The cationic water-absorbing resin is a dialkyl (C1-4) aminoalkyl (C2-6) (meth)
Acrylate and its quaternary salts (alkyl (C1-C1
4) Halide or dialkyl (reaction product with C1-4 sulfuric acid), dialkyl (C1-4) aminohydroxyalkyl (C2-6) (meth) acrylate and quaternary salts thereof, dialkyl (carbon) Number 1 to 4) Amino (meth) acrylamide and its quaternary salt, dialkyl (C 1 to 4) amino hydroxyalkyl (meth) acrylamide and its quaternary salt, N-alkyl (C 1 to 4)
Polymer cross-linked products of cationic monomers (a) represented by aminovinylpyridinium halides, trialkyl (C1-4) allyl ammonium halides, etc .; these cationic monomers (a) and (meth) acrylamide, vinyl alcohol (acetic acid Vinyl saponification product), hydroxyalkyl (C2-5) (meth) acrylate, PEG
(Number average molecular weight: 200 to 4,000) (meth) acrylate, polymethoxy PEG (Number average molecular weight of PEG:
200 to 4,000) Copolymer crosslinked product with a nonionic monomer (b) typified by (meth) acrylate; typified by the cationic monomer, the nonionic monomer and (meth) acrylic acid Examples thereof include crosslinked copolymers of the carboxylic acid monomer (c).

In the present invention, among the anionic water absorbent resins such as carboxylic acid water absorbent resins and sulfonic acid water absorbent resins, nonionic water absorbent resins and cationic water absorbent resins, sulfonic acid water absorbent resins, Nonionic water-absorbing resin and cationic water-absorbing resin, concrete for fixing anchors, cement, mortar, soil, even with respect to water containing polyvalent metal present in groundwater, etc., decrease in water absorption for a long period of time. A small amount can be preferably used. When a carboxylic acid-based monomer is copolymerized as a sulfonic acid-based water-absorbent resin, a nonionic water-absorbent resin, and a cationic water-absorbent resin, the copolymerization ratio of the carboxylic acid-based monomer is 5%.
It is preferably 0% by weight or less, more preferably 30% by weight or less. When the copolymerization ratio of the carboxylic acid-based monomer exceeds 50% by weight, the carboxylic acid component is gradually cross-linked by cement-containing water, ground water or polyvalent metal ions, leading to a decrease in the absorption amount of the water-absorbent resin, which results in long-term May leak water.

A conventionally known method is used as a method for producing these water absorbent resins. The cross-linking method may be an ordinary method, for example, a polymerizable cross-linking agent having 2 to 6 or more double bonds in the molecule [N, N'-methylenebisacrylamide, trimethylolpropane triacrylate, pentaerythritol trichloride. Allyl ether, etc.] is added at the time of polymerization of the monomer to obtain a cross-linked product by copolymerization; a reactive cross-linking agent having 2 to 6 or more functional groups capable of reacting with the monomer and the polymer in the molecule [polyisocyanates ( MDI, TDI, etc.), polyglycidyl compounds (ethylene glycol diglycidyl ether, polyglycerol polyglycidyl ether, glycidyl methacrylate, etc.), polyols (glycerol, polyglycerol, etc.), polyamines (polyethyleneimine, ethylenediamine, tetraethylenepentamine, etc.) ) Etc.] A method of adding a monomer before polymerization, after polymerization, or after preparing an uncrosslinked polymer at an arbitrary stage, and heating it as necessary to obtain a crosslinked body; although depending on the kind of the polymer, the uncrosslinked polymer is usually 100 Examples of the method include a method of obtaining a crosslinked product by heating at a temperature of not less than 0 ° C, preferably at least 130 ° C and thermally crosslinking. Of these cross-linking methods, allyl ether type polymerizable cross-linking agents represented by pentaerythritol triallyl ether and bis (meth) acrylamide type cross-linking agents represented by N, N′-methylenebisacrylamide are used for cross-linking. The water-absorbing resin does not easily dissolve or deteriorate for a long period of time because the cross-linked structure is unlikely to cause hydrolysis or the like even for alkaline water such as concrete or cement over a long period of time. Therefore, it is more preferable.

The absorption capacity of the water-absorbent resin used in the present invention is preferably 30 to 2,000 times with respect to tap water. If cement is used to fix the anchor and construction of a property near the coastline is taken into consideration, the cement content is increased. It is more preferable that the absorption amount for water or seawater is high, that is, the absorption amount for cement supernatant is 30 to 300 g / g or more, and the absorption amount for artificial seawater is 15 to 200 g / g, and long-term water stopping property is also added. Then, the reduction rate of the absorption amount after repeated to the cement supernatant and artificial seawater is 70%.
The above are particularly preferable.

The shape of the water-absorbent resin is not particularly limited, but for example, granular, granular, granulated, scaly, lumpy,
Pearl-like, fibrous, etc. The particle size of the particles of the water absorbent resin is not particularly limited, but preferably 1 to 1 in terms of average particle size.
2,000 microns, more preferably 50-1,000
It is a micron particle. The average particle size means the mass average particle size, and the mass average particle size is the particle size distribution of each cross-linked polymer, the horizontal axis is the particle size, and the vertical axis is plotted on a logarithmic probability paper of the content on a mass basis. It is measured by the method of determining the particle size at which 50% of the mass is reached.

In the present invention, the water-absorbent resin is enclosed in the exterior material in order to prepare the water-stopping material. The amount of the water-absorbent resin enclosed varies depending on the structure of the water-stopping material. When the waterproof material is a tape-shaped and / or strip-shaped structure (water-proof structure), the amount of water-absorbent resin enclosed depends on the thickness and material of the exterior material, the width of the exterior material, the type of water-absorbent resin, etc. It depends, but preferably 5
00-20,000 g / m ² , more preferably 1000
~ 10,000 g / m ² . When the basis weight of the water-absorbent resin is 500 g or more, the water blocking material swells sufficiently and complete water blocking can be achieved. On the other hand, the basis weight is 20,000
When it is g or less, the thickness of the water blocking structure does not become too thick, workability for installation is good, and there is no case where a gap is formed to prevent water blocking, and it is economical.

When the water-stop structure is formed into a lotus root-like or donut-like bag, the amount of the water-absorbent resin added is 0.001 to 1 g / c per internal volume (V) when the exterior material is inflated.
m ³ , preferably 0.01 to 0.6 g / cm ³ . A lotus root-like or donut-like bag means. V = [Lo ² −Σ <k = 1-n> Li ² ]? L / 4π Lo: Inner circumference of outer tube Li: Outer circumference of inner tube n: Number of inner tubes Σ <k = 1-n>: Sum of n Li ² L: Length of outer material (inner dimension) n When = 1, V = [Lo ² −Li ² ]? If the L / 4π encapsulation amount is less than 0.001 g / cm ³ , the swelling of the water-absorbent resin may not be sufficient due to insufficient swelling of the water-stopping resin, while the bulk density of the water-absorbent resin may be insufficient. Depending on the condition, 1 g / cm @ 3 of resin may not fit in the bag.

The exterior material used in the present invention needs to have at least a part having water permeability so that water can contact the water-swellable water-absorbent resin. Water may only be able to enter through the gaps in the exterior material, but in order to be able to quickly absorb the water, at least a part of the exterior material has water permeability and the water absorbent resin swells due to water absorption. It is preferable that the material has wet strength and flexibility in a wet state to the extent that tearing does not occur even when it is performed. For this reason,
A fabric, a mesh film, and the like, and a multi-layered combination thereof are preferable. The ratio of the area having water permeability to the area of the entire exterior material is preferably 25% or more, more preferably 50% or more, and particularly preferably 75%.
That is all. Here, the water permeability is preferably 30 seconds or less, more preferably 15 seconds or less, and particularly preferably 5 seconds or less, in terms of the time (seconds) in which 100 ml of 25 ° C. ion-exchanged water passes through an area of 100 cm ^2. is there. If the normal strength of the exterior material is preferably 2 kg / cm or more, preferably 3 kg / cm or more in both length and width, no problem in handling occurs. The wet strength (tensile strength after immersion in ion-exchanged water at 25 ° C. for 1 minute) is preferably 0.05 kg / cm or more, more preferably 0.1 kg / cm or more. The cloth is not particularly limited as long as it has the above-mentioned wet strength, and any synthetic fiber (polyester, polyamide, vinylon, acrylic fiber, etc.), semi-synthetic fiber (acetate, rayon, etc.), natural fiber (cotton, All fiber materials such as silk, wool, etc., and their mixed products (blended products, etc.) can be applied. It may be woven or non-woven. Examples of the mesh film include a sheet of polyethylene, polypropylene or the like having many fine holes formed therein. The water-permeable material is preferably made of a fabric of natural fibers and / or synthetic fibers, a mesh film, or a combination of two or more thereof.

In the present invention, when the waterproof material structure is a tape-shaped and / or strip-shaped structure, in order for the water-swellable water-absorbent resin that has absorbed water to expand uniformly in the packaging material, It is desirable that the water-absorbent resin be fixed to the exterior material in a state where the amount of resin per hit is almost evenly sandwiched,
Therefore, a felt-like nonwoven fabric is particularly preferable among the above materials. As the felt, woven felt, press felt, needle punch felt, etc. are generally called as felt, and are described in, for example, "Handbook of Industrial Textile Materials" (Japanese Textile Machinery Society, pp. 362-381). Things can be used. Is not particularly limited basis weight of the felt is preferably from 50 to 1000 g / m ^2, in particular 100 to 500 g / m ² is preferred.

In the present invention, the method for producing the tape-shaped and / or strip-shaped water blocking material structure is particularly preferable as long as the water absorbing resin can be enclosed in a predetermined amount and the structure can have a predetermined size. Although not limited, for example, one in which a water absorbent resin is enclosed between sheets of the exterior material and cut into a predetermined size as necessary, one in which a water absorbent resin is enclosed in a bag-shaped exterior material of a predetermined size, etc. Can be mentioned as a preferable example.
The water-absorbent resin may be formed by bending one sheet and inserting the sheet between them, or may be sandwiched between at least two sheets. The two sheets may be the same or different. For example, one may have a lower strength than the other. Further, the tape-shaped and / or strip-shaped water-stopping structure has a resin sandwiched at least in the longitudinal opening of the water-stopper so that the water-absorbent resin is not extruded from the water-stopper even after swelling. It is desirable that it is blocked in a closed state.

As a method for preventing the water-absorbent resin from being extruded at the time of swelling, for example, a method of heat-sealing a part or all of the fibers constituting the cloth of the opening into a heat-sealing fiber, a method by sewing, a hot method Examples include a method of using an adhesive such as a melt and a method of sandwiching the opening with a film-like material, a method of fixing with heat sealing or an adhesive, a method of attaching by sewing using a hem so as to wrap the opening, and the like.
Any method may be selected as long as the water-absorbent resin is not extruded after swelling with water, but a heme-stopping method is more preferable in order to prevent extrusion of the water-absorbent resin almost completely. The material of the heme at this time is not particularly limited, but it is preferable that the material has wet strength and flexibility in a wet state to the extent that it does not break even when swollen in water.
Therefore, the above-mentioned cloth, mesh film and spunbond are preferable. Spunbond is particularly preferable.

Further, in the tape-shaped and / or strip-shaped water stopping material of the present invention, the water-swellable water-absorbent resin is added almost uniformly to the outer packaging material, and the needles are provided between the outer packaging material. It is also possible to partially fix it by a method such as punching or heat sealing to suppress or prevent the flow and uneven distribution of the water absorbent resin in the exterior material, and when water is absorbed, the water absorbent resin can expand without unevenness in the sheet Is.

In the present invention, when the water blocking material structure is in the form of a tape and / or a band, it can be cut into an appropriate size according to the shape of the cross section of the water blocking in terms of workability. Desirably, it is a tape or strip that can be cut. Regarding the dimensions of the waterproof material structure, the thickness is preferably 0.1 to 5 cm, the width is 0.3 cm to 50 cm, and the length is 0.1.
~ 100 m. More preferably, the thickness is 0.2 to 3c
m, width 0.5 to 30 cm, and length 0.5 to 50 m.
This value includes both before and after cutting. When the thickness is 0.1 cm or more, a predetermined amount of the water absorbent resin can be added, and the water blocking effect is sufficient, while when the thickness is 5.0 cm or less, the water blocking material structure is not too thick and the workability is good. It is easy to fill the gap between the anchor steel wire and the excavation hole.

Regarding the width of the water blocking material structure, the width is 0.3.
If the width is 50 cm or more, the waterproof material structure is not too thin, and the water blocking effect is sufficient. On the other hand, if the width is 50 cm or less, it is not necessary to push the waterproof material deep inside the excavation hole, and workability is good. is there. Regarding the length, if the length is 0.1 m or more, the water blocking material structure is not too short and the gap between the anchor steel wire and the excavation hole can be filled, and the water blocking effect becomes sufficient, while the length is 100 m.
When it is below, the water blocking material is not too large and the workability is good.

In the present invention, when the structure of the water blocking material is a donut shape or a lotus root shape, the method of making the water blocking material is, for example, a bag of a donut shape or lotus root shape exterior material part of which is opened in advance. Then, after adding a predetermined amount of the water-absorbent resin into the bag, a method of heat-sealing the opening so that the water-absorbent resin is not extruded from the water blocking material even after swelling from the opening, sewing Method, using an adhesive such as hot melt, sandwiching the opening with a film-like material and fixing with heat seal or adhesive, attaching by sewing using a hem so as to wrap the opening, etc. It is preferable to block by the method.

The size of the water-stopping material when the structure of the water-stopping material is donut-shaped or lotus root-shaped depends on the diameter of the excavation hole, the thickness of the anchor steel wire, and the number, but it is swollen by the swollen water-absorbent resin. The outer diameter of the outer casing is usually 5 to 30 cm (the outer circumference is 5
π to 30 π cm), preferably 10 to 20 cm. If the outer diameter of the exterior material is less than 5 cm, even if the water blocking material swells, the gap may not be completely filled and water leakage may occur. On the other hand, if the outer diameter exceeds 30 cm, the water blocking material may be successfully inserted into the excavation hole. It may be difficult to work and workability may deteriorate. The length of the water blocking material when the water blocking material is in the shape of a donut or lotus root depends on the depth of the excavation hole, but is usually 1 to 100 cm, preferably 5 to 50 cm. If the length is less than 1 cm,
There is a case where the water stop part is too short and the water stop is insufficient. On the other hand, if the length exceeds 100 cm, it may not be able to fit in the hole or the workability may deteriorate depending on the depth of the hole. There are cases.

The inner diameter of the donut-shaped waterproof material is
There is no particular limitation because it depends on the thickness and the number of anchor steel wires, but preferably the thickness of one anchor steel wire is 10 to 20.
mm, the number of 1 to 15 is generally,
The inner diameter is preferably 10 to 100 mm, more preferably 15 to 50 so that the anchor steel wire can be inserted in a dry state.
mm. The inner diameter when using a lotus root-like waterproof material is also
There is no particular limitation because it depends on the thickness of the anchor steel wire, but since the thickness of one anchor steel wire is about 10 to 20 mm as described above, if the expansion of the cloth of the exterior material is taken into consideration, The size is preferably about 5 to 30 mm, more preferably 6 to 20 mm, as an inner diameter when dried. Since the number of holes depends on the number of anchor steel wires used, it may be appropriately determined according to the number of anchor steel wires. In addition, although the expression of the inner diameter is used here, the shape of the inner hole is not particularly limited as long as the anchor steel wire can be inserted in a dry state, particularly for the lotus root-shaped waterproofing material, and any of a circle, an ellipse, a cut shape, etc. But good.

A water blocking method using the water blocking material of the present invention will be described. In the anchor construction method, normally, an excavation hole with a depth of about 1 to 5 m is first opened in the ground or wall to be strengthened, and cement, fresh concrete, mortar, etc. are poured into the excavation hole up to about half of the excavation hole and injected. Put the anchor steel wire inside the cement or concrete before hardening and fix the hardening and anchor steel wire in this state. At this time, the anchor steel wire has such a length that the anchor steel wire is exposed to the outside by several meters (for example, 1 to 10 m) from the entrance of the excavation hole so that the anchor steel wire can be tensioned at a later date. In the method for installing the water blocking material of the present invention, since the numbers of the drill holes and the anchor steel wires are not always constant, the water blocking material before swelling is wound around the anchor steel wires outside the drill holes as shown in FIG. After cutting the water blocking material to a size that can almost fill the gap between the drill hole and the anchor steel wire, insert the water blocking material between the drill hole and the anchor steel wire for more complete water blocking. Is preferred. The waterproof material is
Since it is usually installed in this manner, it is preferably wound in a roll shape, which allows it to be used in any size and shape in accordance with the space. If it is in the form of a roll, it can be wound around the anchor steel wire, and cut and used when the diameter of the excavation hole is almost reached. Also, by winding a tape-shaped or strip-shaped material in a roll shape, the water blocking material can be made compact, so that workability is good for winding around the anchor steel wire.

In the anchor construction method, the number of anchor steel wires per excavation hole is usually plural (about 3 to 12) due to problems such as strength during pulling. Regarding the winding method when a tape-shaped or strip-shaped waterproof material structure is used for the anchor steel wire, a method of winding the waterproof material structure on the outside of a plurality of anchor steel wires may be used as shown in FIG. 3-1 and 3-
As shown in Fig. 2, in addition to winding the waterproof material in the gap between the anchor steel wires, or winding the tape-shaped or strip-shaped waterproof material structure around the cable, It is more preferable to wind the water blocking material structure around the outer circumference of the anchor steel wire by using another water-swellable core material or the like that fills the gap between the wires. That is, it is particularly preferable to use the core-type water blocking material for anchor steel wire gap sealing.

The water-swellable core material is a water-swellable material similar to the water-stopping material (a structure in which a water-absorbent resin is enclosed in a water-permeable exterior material), and anchor steel There is no particular limitation as long as it can fill the gap between the lines, but for example, (i) the tape-shaped or strip-shaped waterproofing material structure of the present invention [instead of the tape-shaped or strip-shaped ,
Sheet-shaped water-stopping material (square, etc.) may be cut into short pieces to wind around each anchor steel wire as a core material as shown in Fig. 4-1, and the water-stopping material is wound from the outside, (ii) the water-stopping material. It is possible to exemplify a method of cutting a part of the water material structure into short pieces, inserting the water material structure into the gap of the anchor steel wire as shown in FIG. 4-2 and then winding another water stopping material structure around the cable. . The size of the core material is not particularly limited as long as it is a size that can fill the gap between the anchor steel wires, but when the core material is used, it depends on the usage method, but the anchor steel wire The parallel length is preferably 1 to 50 cm, and the vertical length is preferably 0.5 to 30 cm. In the case of method (ii),
The core material is columnar [cylindrical,
Prisms (triangular, Y-shaped, T-shaped, X-shaped, H-shaped, star-shaped and the like in cross section) and their deformed shapes (such as those in which the side surfaces of the triangle are curved and recessed) may be used.

Next, a method of installing a donut-shaped or lotus root-shaped waterproof material as the waterproof material of the present invention will be described. When using a doughnut-shaped waterproofing material, draw an anchor steel wire.
As shown in 5, it is preferable to pass through the inner hole of the water blocking material and insert it into the excavation hole. In this case, the gap between the anchor steel wire and the excavation hole is filled, but it is difficult to fill the gap between the anchor steel wires, so when using a doughnut-shaped waterproof material, it is better to use the same core material as above. preferable. When using a lotus root type water stop material as the water stop material, as shown in Fig. 6, insert each anchor steel wire into each hole of the lotus root water stop material and then install it at the excavation hole. Is preferred. When using this shape of water blocking material, it is difficult to create a gap between the anchor steel wires, depending on the size of each hole and the thickness of the anchor steel wire.
It is not always necessary to use the above core material together.

[0030]

EXAMPLES The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited thereto. The water absorption amount of the water-absorbent resin used for the water blocking material, the absorption amount of the tap water, the absorption amount of the cement-containing water and the artificial seawater after the initial and repeated tests were tested by the following methods. Hereinafter, unless otherwise specified,% means mass%.

[Absorption amount of tap water] 0.10 g of a water-absorbent resin was added to 500 g of tap water, the mixture was stirred for 1 hour using a magnetic stirrer, and then swollen with a nylon screen having an opening of 75 μm. The resin was filtered, excess tap water was drained off, the weight of the water-absorbent resin on the nylon screen was measured, and the absorbed amount of tap water (g /
g).

[Amount of Cement Supernatant Absorbed Initially and Repeatedly] A container of 20 liters was charged with 1 Kg of ordinary Portland cement and 19 Kg of tap water, stirred sufficiently, and allowed to stand to allow the cement to settle, followed by decantation to cement. The supernatant was collected. After adding 1.00 g of water-absorbent resin to 500 g of this cement supernatant and stirring for 1 hour using a magnetic stirrer, 75 μm
The swollen water-absorbent resin was separated by using a nylon screen with an opening, the excess cement supernatant liquid was drained, the weight of the water-absorbent resin on the nylon screen was measured, and the initial absorption amount of the cement supernatant liquid was measured. (G / g).
Put all the swollen water-absorbent resin on the nylon screen into a beaker, and newly create cement supernatant liquid 500g
Was added, and the mixture was stirred for 1 hour, and the swollen water-absorbent resin was filtered off again using a 75 μm nylon screen. The same operation was repeated 10 times in total, and the absorption amount at the 10th time was defined as the absorption amount (g / g) after repeating the cement supernatant.

[Initial absorption amount of artificial seawater and absorption amount after repetition] 1,000 g of artificial seawater prepared by using commercially available "Aquamarine" (trademark of artificial seawater, manufactured by Yasu Pharmaceutical Co., Ltd.) After adding 00 g and stirring for 1 hour using a magnetic stirrer, the swollen water-absorbent resin was filtered off using a nylon screen with a 75 μm opening, excess groundwater was drained off, and the water absorbency on the nylon screen was absorbed. The weight of the resin was measured and used as the initial absorption amount (g / g) of artificial seawater. Put all the water-absorbent resin on the nylon screen in a beaker, add 1,000 g of the newly created artificial seawater, and stir for 1 hour.
The swollen water-absorbent resin was filtered off using a nylon screen of m. The same operation was repeated 10 times in total, and the absorption amount at the 10th time was taken as the absorption amount (g / g) after repeating artificial seawater.

Example 1 996 g of 50% aqueous acrylamide solution, 4 g of sodium acrylate, 0.1 g of methylenebisacrylamide and 1000 g of ion-exchanged water were added to a 3 liter adiabatic polymerization tank, and the contents were uniformly dissolved. Cooled down. Nitrogen is passed through the contents to remove dissolved oxygen, and then 1 g of 1% hydrogen peroxide aqueous solution and 0.1% L-ascorbic acid aqueous solution 2
and 3 g of a 1% azo V-50 aqueous solution (manufactured by Wako Pure Chemical Industries, Ltd.) were added to initiate polymerization. After 10 hours, the contents were taken out, and the hydrogel was subdivided with a meat chopper, and then 10
Dry with a ventilation dryer at 0 ° C to dry the product to 100
Anionic water-absorbent resin crushed to ~ 1000μm (1)
Got The absorption amount of tap water, the initial absorption amount and the repeated absorption amount in the cement supernatant and artificial seawater of this water absorbent resin (1) were measured. The results are shown in Table 1. Feline vinylon non-woven fabric (Basis weight: 150 g / m ² ,
3000g / m of water-absorbent resin (1) in thickness of about 1mm)
^It was sprayed evenly so that it became ² . After stacking another non-woven fabric thereon, the two non-woven fabrics were fixed with a needle punch, and then cut into a width of 20 cm and a length of 3 m. The outer periphery was hem-stopped by using a polyester spun bond (width of about 3 cm) to prepare the water blocking material (A) of the present invention. The waterproof material had a thickness of about 4 mm.

Example 2 400 g of acrylamido-2-methylpropanesulfonic acid (Toagosei Co., Ltd.), 72 g of acrylic acid, 40 g of sodium hydroxide, 0.05 g of methylenebisacrylamide and ion-exchanged water were placed in a 3-liter adiabatic polymerization tank. 988g
Was added to dissolve the contents uniformly, and the mixture was cooled to 5 ° C. Nitrogen is passed through the contents to remove dissolved oxygen, then 1%
Hydrogen peroxide aqueous solution 1 g, 0.1% L-ascorbic acid aqueous solution 2 g and 1% azo V-50 aqueous solution (manufactured by Wako Pure Chemical Industries, Ltd.)
3 g was added to initiate polymerization. After 10 hours, the contents were taken out, and the hydrogel was subdivided with a meat chopper, then dried using a ventilation dryer at 100 ° C., and the dried product was pulverized to 100 to 1000 μm to obtain a water absorbent resin (2). Obtained. The water absorption amount of this water absorbent resin (2), the initial absorption amount in the cement supernatant and artificial seawater, and the absorption amount after repetition were measured. The results are shown in Table 1. A water blocking material (B) of the present invention was prepared in the same manner as in Example 1 except that the water absorbent resin (2) was used instead of the water absorbent resin (1).

Example 3 Instead of the water absorbent resin (1) used in Example 1, a commercially available water absorbent resin (3) (Sunfresh ST-573, polyacrylic acid Na crosslinked product, manufactured by Sanyo Chemical Industry Co., Ltd.) A water blocking material (C) of the present invention was prepared in the same manner as in Example 1 except that The absorption amount of tap water, the initial absorption amount and the repeated absorption amount in the cement supernatant and artificial seawater of this water absorbent resin (3) were measured. The results are shown in Table 1.

Example 4 To a 3 liter adiabatic polymerization tank, 600 g of 50% aqueous solution of acrylamide, 800 g of 70% aqueous solution of acryloyloxyethyltrimethylanimonium chloride, 0.1 g of methylenebisacrylamide and 600 g of ion-exchanged water were added, and the contents were added. After being uniformly dissolved, it was cooled to 5 ° C. Nitrogen is passed through the contents to remove dissolved oxygen, then 1%
Polymerization was started by adding 1 g of a hydrogen peroxide aqueous solution, 2 g of a 0.1% L-ascorbic acid aqueous solution and 3 g of a 1% azo V-50 aqueous solution. After 10 hours, the contents were taken out, the hydrogel was subdivided with a meat chopper, and then dried using a ventilation dryer at 100 ° C.
It was pulverized to 0 μm to obtain a water absorbent resin (4). The water absorption amount of this water absorbent resin (4), the initial absorption amount in cement supernatant and artificial seawater, and the absorption amount after repeated measurement were measured. The results are shown in Table 1. Approximately 2 mm thick cotton woven fabric is processed by sewing and has an outer diameter of 20 cm and an inner diameter of 4 c.
An outer packaging material of a coaxial double tubular bag having a length of m and a length of 20 cm was prepared. At this time, the internal volume of the exterior material is approximately 5730 cm ³
When the bag of the exterior material is sewn, 1,000 g (0.1745 g / cm ³ ) of the water absorbent resin (4) is added to the exterior material, and the encapsulated water absorbent resin does not spill. Thus, the water-stopping material (D) of the present invention was obtained by completely sealing.

Comparative Example 1 A mouth water packer (manufactured by Sep Corporation, described above), which is a commercially available waterproof material for anchors, was used as a comparative waterproof material (1). The structure of the mouth packer is a donut-shaped (hollow cylindrical) bag having a hole (about 4 cm) into which an anchor steel wire can be inserted at the center (outer diameter of about 20 cm when expanded, length of about 30 cm).
The structure has an injection port (with a check valve) into which mortar and the like can be press-fitted inside the bag.

[Installing Method of Water-Stopping Material] Since the installing method of the water-stopping material is slightly different depending on the structure of the water-stopping material, the difference will be described below. Water-stopping materials (A) to (C) of the present invention; 5 anchor steel wires having a diameter of 12 mm and a length of 1.5 m were put in an acrylic tube having an inner diameter of 15 cm and a length of 1 m assuming an excavation hole. .
The water blocking materials (A) to (C) of the present invention are wound outside the acrylic tube by the winding method shown in FIG. 3-1 while inserting the water blocking material between the anchor steel wires as well. The waterproof material is tightly wrapped around the circumference of the water, and the outer diameter of the wound waterproof material is about 1
The water blocking material was cut when it reached 5 cm (about 2.5 m). Slide the cut water-stop material along the anchor steel wire, and put it inside the acrylic tube assuming an excavation hole so that the water-stop material reaches the outlet on the opposite side of the tube and the water-stop material protrudes outside. Inserted so that it is completely inside the tube so that it does not get stuck. Water stop material (D) of the present invention; inner diameter 15c assuming an excavation hole
12 m diameter in a 1 m long acrylic tube
Five anchor steel wires having a length of m and a length of 1.5 m were put therein. The water blocking material (A) of the present invention was wound around each anchor steel wire once as a core material, and fixed with Velcro (registered trademark). Further, the water blocking material (D) was attached from above so as to cover the periphery thereof, and then inserted into an acrylic tube in the same manner as above. Comparative water stop material (1); inner diameter 15c assuming an excavation hole
12 m diameter in a 1 m long acrylic tube
Five anchor steel wires having a length of m and a length of 1.5 m were put therein. Insert 5 anchor steel wires together into the central hole of the comparative water stop material (A), slide the water stop material along the anchor steel wire, and insert it into an acrylic tube that assumes an excavation hole. It was completely inserted in the same way. After inserting the water blocking material, press the mortar into the water blocking material using the high-viscosity pump through the injection port, inflate the water blocking material with the mortar, and close the injection port so that the injected mortar does not come in backward. . After sealing, the mixture was left for about 1 day to cure the injected mortar.

[Water stop test-1] The acrylic tube containing the anchor steel wire was turned upside down and a clamp was used.
Fix it so that the acrylic tube is vertical (the inserted waterproofing material is located in the lower part of the acrylic tube), and from the upper part of the acrylic tube, transfer the cement supernatant used for measuring the absorption amount to the acrylic tube. It was poured until it became full, and when the water leaked from the water blocking material and the water level dropped, a liquid was always supplied so that the cement supernatant liquid would fill the acrylic tube. The time at which the liquid leaking from the lower part of the acrylic tube could be completely stopped after the cement supernatant was injected was defined as the stop time. When water leakage from the lower part stopped, it was left still in that state, and it was observed again for 30 days whether or not water leakage occurred again. When water leakage occurred, the time was recorded. The cement supernatant in the tube was replaced with a new one once a day so as to circulate. A similar test was conducted using tap water and artificial seawater instead of the cement supernatant. The results are shown in Table-2.

[Water stop test-2] After the water stop test-1 was completed, the anchor steel wire protruding from the lower side of the acrylic tube was fixed to the winch with a wire, and each anchor steel was fixed using the winch. The line was pulled and moved downward by 30 cm to observe whether water leakage occurred or not. By the movement of the anchor steel wire, if a new water leak occurs, in the same manner as in the water stop test-1, pour the cement supernatant liquid used for the measurement of the absorption amount again until the acrylic tube is full, When the water leaked from the water blocking material and the water level dropped, a liquid was supplied so that the cement supernatant liquid would always fill the acrylic tube. After the anchor steel wire was moved, the time when the liquid leaking from the lower part of the acrylic tube was completely stopped was defined as the re-stopping time. A similar test was conducted using artificial seawater instead of the cement supernatant. The results are shown in Table-2.

[0042]

[Table 1]

[0043]

[Table 2]

The following is clear from Tables 1 and 2. The water-stopping materials (A) to (C) and (D) of the present invention are capable of completely stopping water in the anchor method, which was not possible with the conventional water-stopping material (1). The water-stopping materials (A) and (B) of the present invention using a nonionic water-absorbent resin and a sulfone-based water-absorbent resin are used for the long-term absorption of cement supernatant or artificial seawater containing a polyvalent metal. It is possible to stop water for a long time with almost no decrease in water flow. The water-stopping materials (A) and (B) of the present invention cause a small amount of water leakage due to the movement of the anchor when the anchor is tensioned, but the water-absorbent resin to be accommodated flexibly responds to it in a short time. Water can be stopped.

[0045]

The anchor water-stopping material of the present invention has the following effects. The water-stopping material of the present invention enables complete water-stopping, which has hitherto not been obtained, even for groundwater, seawater, etc. containing cement and the like. Further, by selecting the type of water-absorbent resin, it is possible to stop water containing these polyvalent metal salts for a long time. Since the water-absorbent resin can move and swell flexibly in the water-stopping structure, even if a new gap is created due to the movement of the anchor when the anchor is tensioned, the gap can be self-repaired in a short period of time so that water can be stopped again. . Therefore, the secondary water stoppage and the tertiary water stoppage after the anchor movement, which has conventionally required a great deal of cost and time, becomes unnecessary. The water discharged from the excavation hole can be used to stop the water by swelling the material.Therefore, even if the water is discharged from the excavation hole at any time, the water can be stopped at any time just by setting it in the initial stage. It can be effective. In particular, when using a tape-shaped or strip-shaped waterproof material, the size can be adjusted arbitrarily, so that the size can be easily adjusted even if the diameter of the protective tube or the diameter of the cable is different. . Further, since it can swell along the gap, it is possible to prevent the formation of tap water, which has been apt to occur conventionally, by swelling. The water inside the protective tube can be used to stop the water by swelling the material, and since no effective reaction is used for stopping the water, it is possible to stop the water in a short time just by setting it. From the above, it is useful as a water stop material and a water stop method in slopes and anchor construction methods such as underground ground construction.

[0046]

[Brief description of drawings]

FIG. 1 is a side sectional view showing a method of installing a water blocking material of the present invention and a position of installation.

FIG. 2 is a cross-sectional view showing a method of installing the waterproofing material structure of the present invention on the outer circumference of an anchor steel wire.

FIG. 3 is a cross-sectional view showing an example of a preferable winding method of the water blocking material structure of the present invention.

FIG. 4 is a view in which a short piece of the water blocking material structure is used.

FIG. 5 is a cross-sectional view (right side) of a doughnut-shaped waterproofing material and a cross-sectional view (left side) when it is installed at an excavation hole.

FIG. 6 is a cross-sectional view (right side) of a lotus root type water blocking material and a cross-sectional view (left side) when it is installed at an excavation hole.

[Explanation of symbols]

1: Drilling hole 2: Concrete, mortar, etc. 3: Anchor steel wire 4: Water blocking material 5: Water-stop material strip 6: Water absorbent resin 7: Exterior material outer tube 8: Inner tube of exterior material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukio Zenitani             1 Sanyo 1-11, Hitotsubashi-honcho, Higashiyama-ku, Kyoto             Kasei Industry Co., Ltd. F-term (reference) 2D041 GA01 GC11

Claims (18)

[Claims] 1. A tape-shaped and / or band-shaped structure comprising a water-absorbent resin encapsulated in an exterior material, at least a portion of which is water-permeable, at a basis weight of 500 to 20,000 g / m ^2. , Waterproof material for anchors. 2. The structure has a thickness of 0.1 to 5 cm, a width of 0.3 to 50 cm, and a length of 0.1 to 10.
The water blocking material according to claim 1, which has a length of 0 m. 3. The water blocking material according to claim 1, wherein the structure has the water absorbent resin interposed between sheets. 4. The stop according to claim 1, wherein at least the opening in the lengthwise direction of the exterior material is closed by a method selected from the group consisting of sewing, heat sealing and bonding with an adhesive. Water material. 5. The water blocking material according to claim 1, wherein the exterior material is fixed by needle punching. 6. A water-blocking structure having one or a plurality of anchor steel wire insertion lumens; the structure having a columnar hollow body having the lumen at least partially formed of a water-permeable material. The water-stopping material for anchors, wherein 0.001 to 1 g / cm ³ of the water-absorbent resin is filled in the hollow portion of the outer casing material per the maximum inner volume of the hollow portion. 7. A bag-shaped exterior having a multi-tube structure in which the exterior material is composed of an outer tube and one or more anchor steel wire insertion lumen forming inner tubes disposed in the lumen thereof. The water blocking material according to claim 6, which is a material. 8. The waterproofing material according to claim 6, wherein the outer casing has a donut shape or a lotus root shape when the outer periphery and the hollow cross section are circular. 9. The length of the exterior material is 1 to 100 cm,
The waterproof material according to any one of claims 6 to 8, wherein the outer periphery of the outer casing is 5 to 30 cm when the outer periphery of the outer casing has a circular cross section. 10. A water-absorbent resin is contained in a sheet-like exterior material having a length of 1 to 50 cm and a width of 0.5 to 30 cm, at least a part of which is made of a water-permeable material, and 500 to 20,000 g of a water-absorbent resin.
An anchor steel wire gap sealing core-type water-stopping material composed of a sheet-like water-stopping structure that is sealed at a basis weight of / m ² . 11. A hollow columnar exterior material, at least a part of which is formed of a water-permeable material, has a volume of 0.
An anchor steel wire gap sealing core-type water-stopping material comprising a columnar water-stopping structure in which 001 to 1 g / cm ³ of water-absorbent resin is sealed. 12. The water absorbent resin is one or more selected from the group consisting of nonionic water absorbent resins, cationic water absorbent resins, and sulfonic acid water absorbent resins.
11. The waterproof material according to any one of 11. 13. The water-absorbent resin is produced by using a cross-linking agent, and the cross-linking agent is an allyl ether type and / or (meth) acrylamide type copolymerizable cross-linking agent. Any of the water blocking materials described. 14. The water blocking material according to claim 1, wherein the water permeable material is a fabric of natural fibers and / or synthetic fibers, a mesh film, or a combination of two or more thereof. 15. The water-stopping material according to claim 1, or a combination of two or more thereof, between the cutting opening for anchor and the anchor steel wire and / or in the gap between the anchor steel wires. , A method of stopping water of an anchor characterized by being provided. 16. A water blocking structure having a tape-shaped or band-shaped water blocking structure and / or an anchor rope insertion lumen is provided between the anchor cutting port and the anchor steel wire. 15. The water stopping method described in 15. 17. The water stop according to claim 15 or 16, wherein a circumference of the anchor rope is wrapped with a tape-shaped or strip-shaped water-stopping structure to seal between an anchor cutting port and the anchor rope. Method. 18. The water blocking method according to claim 15, wherein a core type water blocking material is arranged in the gap between the anchor steel wires.