JPH0726263A - Grout composition for stabilization of soil or the like and work of stabilization, strengthening and water stop of soil therewith - Google Patents

Abstract

PURPOSE:To obtain a grout composition for binding sand, rock, brick or coal or for sealing cavities in bedrock or an artificial structure and to provide the stabilization work performed therewith. CONSTITUTION:This grout composition comprises a polyol and/or an organic polyamide compound (A), an organic polyisocyanate compound (B) and at least 5 pts.wt. water per 100 pts.wt. total of components A and B. The stabilization work comprises grouting rock, ground, an artificial structure or the like with this composition.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to rock solids having fracture zones and unstable stabilization of unstable soft ground, water leakage, water stop of rocks or springs with spring water, and ground and concrete for shield excavation work. Filling voids between segments, sealing voids such as earth and sand, rocks, bricks, coal, etc., cracking artificial structures such as concrete, stable strengthening waterproofing method for voids, etc. Regarding things.

[0002]

2. Description of the Related Art Conventionally, inorganic or organic grout has been injected as one of the methods for strengthening unstable rocks and grounds and for filling cracks and voids in artificial structures, to some extent.

However, a detailed check of these methods has not always yielded satisfactory results. For example, the cement milk system, which is commonly used, is in the form of a suspension, so the permeability to cracks such as rocks and artificial structures and ground layers such as gravel is poor, and the consolidation speed is slow, and strength development occurs. Since it is slow, it is not possible to achieve the purpose of early and stable strengthening of unstable rocks when excavating tunnels and underground ground, which are required to consolidate and develop strength in a short time. In addition, the injected cement milk is diluted and washed away even if there is spring water or water leakage. Also, the water-based two-liquid system grout, which is a typical inorganic grout, has a low solidified strength of about 3 to 10 kg / cm ² , and further changes with time when the solidified material comes into contact with water.
There is a problem that the main components such as Na ₂ O and SiO ₂ are leached out, resulting in alkali contamination and a significant decrease in strength.

On the other hand, organic grouts such as urea also have problems such as insufficient consolidation strength and elution of hardening components and auxiliary components such as sulfuric acid and formalin.

Further, Japanese Patent Publication No. 63-63687 and 63-63688.
JP, JP 63-7413 JP, 63-7490 JP, JP
63-7491, 63-8477, 63-35913, etc. describe a method for consolidating rock mass by injecting a fast-curing rigid urethane foam system containing polyol and polyisocyanate as main components. However, although it can be expected to have a consolidation effect, it has the following problems.

That is, the reaction temperature after the two liquids are mixed becomes extremely high, and the ground having large voids,
If you inject a large amount into a void such as the back of an existing tunnel,
Reaction heat is accumulated, and the temperature of foamed and cured urethane resin, including raw material polyol, additives, and polyisocyanate, reaches a temperature above the ignition point, which may cause a fire, the viscosity of the polyol component is high, and the polyisocyanate component In order to improve the dispersibility with
Since it is necessary to dilute with an organic solvent, it is not preferable in terms of safety and hygiene, and since the above raw materials are used, it is extremely expensive and there are problems such as environmental pollution.

Generally, according to the method using a rigid urethane foam, as described in the above-mentioned literature, a foaming agent such as a polyol and freon, a catalyst, a foam stabilizer, and 0 to 2 parts by weight per 100 parts by weight of the polyol. By mixing a small amount of a mixed liquid such as water with polyisocyanate at a predetermined ratio, a solidified body having an expansion ratio of 2 to 30 times can be obtained. However, in this method, since a large amount of heat is generated during the reaction when forming a foamed solidified body, it is possible to foam-mold a large amount at a time, or even for molded articles with a wall thickness of 10 mm or more and civil engineering applications. When a large amount is injected into the void, there is concern that the internal scorch and further fire may be generated due to the accumulated heat of reaction. Therefore, it has been recognized that it cannot be applied to voids in rock, ground, artificial structures, and backfilling materials for shield construction.

[0008]

Therefore, as a result of intensive studies in view of the above-mentioned conventional techniques, the present inventors have found that a large amount of water is added to a polyol and / or an organic polyamine compound and an organic polyisocyanate compound. Unexpectedly, there is no fire or scorch when the added material is injected into rocks, ground, or artificial structures, and it is possible to stabilize and strengthen these rocks, grounds, or artificial structures stably, and to provide a void seal. Finally, they finally found that they could stop the water, and completed the present invention.

[0009]

[Means for Solving the Problems] That is, the present invention provides (A)
Polyol and / or organic polyamine compound, (B)
Organic polyisocyanate compound, and (C) the (A)
The first invention is an injectable liquid chemical composition for stabilizing soil and the like, which is composed of 5 parts by weight or more of water per 100 parts by weight of the total amount of the component and the component (B). Drill a hole, insert a hollow injection bolt into the hole,
A second aspect of the present invention is a stable water-stop construction method for rock or ground, characterized by injecting the stabilizing injection chemical composition into the rock or ground through an opening of a bolt and solidifying the composition. A third aspect of the present invention is a stable reinforcing water stop method for an artificial structure, which comprises inserting an injection pipe, injecting the stabilizing chemical liquid composition for stabilization into the artificial structure through the injection pipe, and solidifying the composition. It is what

[0010]

[Operations and Examples] When the composition for injecting chemicals for stabilizing soil or the like of the present invention is injected into rock, ground or artificial structure, the heat generated during the reaction is water due to the large amount of added water. Is lost as the heat of vaporization during the evaporation of
Even when the heat storage temperature is usually 150 ° C or higher, heat generation can be suppressed to a temperature of 100 ° C to 120 ° C, which is the boiling point of water, so that no fire or scorch will occur.

Further, when the stabilizing injectable liquid composition of the present invention is used, since a hard foamed polyurethane solidified body mainly containing a urea bond is formed, the solidified strength is large and the void seal is large. Excellent effect and stability enhancement result,
It is possible to effectively enhance the stability of rocks, ground, and artificial structures, and to seal voids and stop water.

The injectable liquid composition of the present invention contains a polyol and / or an organic polyamine compound as the component (A).

The hydrogen group value of the polyol is preferably 10 to 2000 mgKOH / g in order to obtain a hard foamed solidified body. Further, in order to facilitate mixing of the polyol and water, it is preferable that the polyol is slightly hydrophilic as it has excellent compatibility with water, specifically, a hydroxyl value of 300 mgKOH / g or less. The ethylene oxide unit has a molecular weight of 0 to 99.5% by weight, preferably 10 to 9%.
It is preferable to add 9.5% by weight to give hydrophilicity.

Specific examples of the polyol include dihydric alcohols such as 1,3-butanediol, 1,4-butanediol and 1,6-hexanediol; ethylene glycol, diethylene glycol, triethylene glycol,
Propylene glycol, dipropylene glycol, butylene glycol, acetylene glycol, glycerin,
Examples thereof include trimethylolpropane, diglycerin, castor oil, dehydrated castor oil, sorbitol, and sucrose alone or in a mixture; and polyols obtained by addition-polymerizing alkylene oxides such as propylene oxide and ethylene oxide. In addition, ethylenediamine, aniline,
Amine polyols obtained by addition-polymerizing alkylene oxides such as propylene oxide and ethylene oxide to tolylenediamine, mono-, di- or triethanolamine are also effective. Furthermore, various polyester polyols obtained by dehydration condensation reaction of dibasic acids such as adipic acid and phthalic anhydride with glycols and triols such as ethylene glycol, diethylene glycol and trimethylolpropane, and lactone-based compounds obtained by ring-opening polymerization of ε-caprolactam. Polyester polyol, phosgenation of polyol, polycarbonate diol synthesized by transesterification method with diphenyl carbonate, other acrylic polyol, polybutadiene polyol,
Furthermore, Mannich polyols, novolac resins, phenolic polyols obtained by addition-polymerizing propylene oxide or ethylene oxide to resol resins, etc., radical-polymerized vinyl monomers such as acrylonitrile and styrene in polyols, and these polymers Examples thereof include polymer polyols dispersed and dissolved in a polyol, polytetramethylene glycol obtained by cationic polymerization of tetrahydrofuran, and modified polyols obtained by addition-polymerizing alkylene oxides with these.

The organic polyamine compound is a component for reacting with an organic polyisocyanate compound which is a component (B) described later to form a skeleton of a solidified body, as in the case of the above-mentioned polyol. Effective in improving strength. The organic polyamine compound is not particularly limited,
In order to obtain a composition containing water in excess, a water-soluble or hydrophilic one is preferable.

Specific examples of the organic polyamine compound include diamines such as ethylenediamine, tri, tetra, penta, hexamethylenediamine and urea,
Monoalcoholamines such as monoethanolamine,
Aromatic primary and secondary amines such as toluenediamine, diethyltoluenediamine, diphenylmethanediamine, m-phenylenediamine, xylylenediamine, 3,3'-dichloro-4,4'-diaminodiphenylmethane, and the end of polypropylene glycol Examples include various amine compounds such as various aminated Jeffamine series (manufactured by Jefferson Chemical Company), polytetramethylene glycol and diester of aminobenzoic acid (manufactured by Kodak). These organic polyamine compounds can be used alone as the component (A) in combination with the organic polyisocyanate compound as the component (B), but they are used in combination with the polyol from the viewpoints of economic efficiency, control of reaction curing time, workability, etc. It is practical to do so.

If necessary, for example, trichloromonofluoromethane (F-11), dichlorodifluoromethane (F-12), etc. may be added to the component (A) as a foaming agent. It is not necessary to use the effervescent agent, and there is no problem even if it is used in an extremely small amount as compared with the usual formulation.

As the foam stabilizer, if necessary, organopolysiloxane, oxyethylated higher alcohol, etc. may be added to the component (A) in a small amount. When the foam stabilizer is blended, it is effective for compatibility with polyisocyanate and foam control of foam cells. The compounding amount of the foam stabilizer is usually a polyol and / or an organic polyamine compound which is the component (A).
It is 3 parts or less with respect to 100 parts (weight part, the same applies hereinafter).

Further, as a catalyst for promoting reaction curing of the organic polyisocyanate composition as the component (B) and the polyol and / or organic polyamine compound as the component (A), for example, dibutyltin dilaurate or octyl acid is used. A metal catalyst such as stannous and a tertiary amine such as alkylamine and triethylamine are usually added in an amount of about 0.01 to 5 parts per 100 parts of the component (A).

Further, when a large amount of water is added to the component (A), it is expected that the pH will change with time due to water.
It is preferable to incorporate a pH buffer to keep the pH of the system in the neutral range. Examples of such buffering agents include potassium dihydrogen phosphate, disodium hydrogen phosphate, sodium tetraborate (borax) and the like. The blending amount of these pH buffers may be about 1% by weight with respect to the amount of water.

Furthermore, if necessary, an antioxidant, a heat resistance imparting agent, an antioxidant, an antifungal agent and the like may be added to the component (A).

The organic polyisocyanate compound as the component (B) is a component that reacts with the component (A) to form polyurethane. The organic polyisocyanate compound is not particularly limited, but any one of isocyanate monomers, polymers thereof such as dimers and trimers, and compounds modified with alcohol or polyol are effective.
The organic polyisocyanate preferably has an isocyanate group content of 5 to 48% by weight, particularly 10 to 33% by weight, from the viewpoint of solid physical properties. Specific examples of such organic polyisocyanate compound include, for example, polymethylene polyphenyl isocyanate, liquid diphenylmethane diisocyanate, tolylene diisocyanate, crude tolylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, naphthalene diisocyanate, hydrogenated diphenylmethane diisocyanate, trimethylene xylylene diisocyanate. A single or a mixture of polyisocyanates such as isocyanate; further, an adduct body obtained by modifying the above polyisocyanate with water or a lower mono- to polyhydric alcohol, or a urethane prepolymer containing a terminal isocyanate group obtained by reacting a polyisocyanate with various polyols. Further, these adducts; or prepolymers and the above-mentioned various polyisos Such one or more a mixture of the Aneto; further catalyst was added to the polyisocyanate, and the like that a dimer or trimer.

Of these various organic polyisocyanate compounds, liquid diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate, urethane isocyanate prepolymers containing terminal isocyanate groups and adducts are preferred from the viewpoints of consolidation strength, safety and health and economical efficiency. It is preferable that the composition has a very low volatility under the so-called handling environment temperature, is in a liquid state, and has a consolidation strength and an economical efficiency. Further, a water-dispersion type in which polymethylene or polyphenylisocyanate is partially modified with a lower alcohol ethoxylate obtained by adding 1 to 10 mol of ethylene oxide to 1 mol of methyl alcohol, ethyl alcohol, etc. is also useful.

If desired, the component (B) may be mixed with a high boiling diluent, a plasticizer, a liquid flame retardant and the like.

The blending ratio of the component (A) and the component (B) (component (A) / component (B)) (weight ratio) is generally 1/10 to
10/1 is preferable, and 1/3 to 2/1 is more preferable.
When the blending ratio is smaller than the above range, the curing time becomes long, and the obtained solidified body tends to be brittle, and when it exceeds the above range, the solidified body becomes soft, The strength tends to be very low.

The reaction equivalent ratio of the OH groups and NH ₂ groups of the polyol in the component (A) to the NCO groups in the component (B) is (OH + NH ₂ ) / NCO of 1/10 to 10/1. Is preferable, and 1/3 to 2/1 is more preferable. When the reaction equivalent ratio is larger than the above range, the solidified body becomes soft and its strength becomes very small, and when it is smaller than the above range, the curing time becomes long and the solidified body becomes solidified. Body strength tends to be weak and brittle.

The injectable liquid composition of the present invention contains water as the component (C).

Water reacts with the organic polyisocyanate compound as the component (B) to form a urea bond and at the same time generates carbon dioxide gas, which is foamed by the action of the carbon dioxide gas to form a foam solidified body, and a large amount of Due to the presence of water, some of it reacts with the NCO group, but at this time (OH + NH
_{Since 2} + water) / NCO (equivalent ratio) reacts so as to be approximately 1/1 to 10/1, excess water exists. This excess water evaporates and takes away the heat of reaction generated when the components (A) and (B) are mixed, suppresses excessive heat storage, and prevents scorch and fire. Have. Water also has the effect of lowering the viscosity of the (A) component, improving the permeability of the injection work and the ground, and improving the miscibility with the (B) component.

The content of water is 5 parts or more based on 100 parts of the total amount of the components (A) and (B). The amount of water is (A)
If the total amount of the component and the component (B) is less than 5 parts with respect to 100 parts, a fire or scorch is likely to be generated due to heat storage of the reaction heat during the reaction solidification with the organic polyisocyanate compound of the component (B). The effect of lowering the viscosity of the component (A) becomes small, the injection work becomes difficult, and the strength of the reaction solid is delayed. If the water content is too large, the solidified body tends to be foamed excessively and become brittle. Therefore, in the present invention, the blending amount of water is preferably 5 to 50 parts.

The injectable liquid composition of the present invention contains various polymeric materials for improving the elasticity and mechanical strength of the solidified body,
For example, solvent type vulcanized or unvulcanized rubber, that is, butadiene rubber, chloroprene rubber, styrene-butadiene rubber, ethylene-propylene rubber and their emulsions, various acrylic resin emulsions, polyvinyl alcohol, ethylene-vinyl acrylate resin emulsion, polyurethane. A bitumen emulsion such as dispersion, polyethylene oxide, or asphalt or rubber-containing asphalt can be appropriately added to the component (A) and / or the component (B).

Further, in the present invention, various flame retardants, flame retardant auxiliaries, inorganic modified fillers and the like are added as additives in order to improve the consolidation strength of the consolidated body and the flame retardant effect. can do.

As the flame retardant, either an addition type or a reaction type can be used. Specific examples of the addition type include phosphorus-containing halogen-containing compounds such as tributyl phosphate, tricresyl phosphate and tris monochloroisopropyl phosphate; halogen-containing compounds such as chlorinated paraffin, pentabromoethylbenzene and decabromodiphenyl ether. can give. Specific examples of the reactive type include dibromoneopentyl glycol, tetrabromobisphenol A, O, O-diethyl N, N-dihydroxyethylaminomethylphosphonate, and various phosphorus-containing polyols having a hydroxyl group or an amino group. Examples thereof include halogen-containing phosphorus compounds.

Specific examples of the flame retardant auxiliary include antimony trioxide, molybdenum oxide, barium metaborate, zinc borate, aluminum hydroxide, magnesium hydroxide, melamine, melamine isocyanurate, red phosphorus, and the like.
Examples thereof include titanium phosphate, ammonium polyphosphate, calcium carbonate, calcium silicate and the like. These are used in combination with the flame retardant or alone to enhance the flame retardant effect.

Specific examples of the inorganic modified filler include, for example, Portland cement, colloidal cement having a small particle size, alumina cement, silica, calcium carbonate, calcium sulfate, bentonite, blast furnace slag, quick lime, slaked lime, fly ash, gypsum, Examples include carbon and pigments. These inorganic modified fillers have a property of hardening together with the urethane component to form a composite solid body, and as a result, the strength of the solid body, the durability, the effect of sealing cracks and voids, the flame retardant effect, etc. are significantly improved. .

The blending amount of these flame retardant, flame retardant auxiliary and inorganic modifying filler is such that the total amount of the components (A) and (B) is 100
It is preferable that the amount is adjusted to 0 to 100 parts, especially 10 to 70 parts.

These are usually the (A) component or
It is blended with any of the components (B) and injected into the pump.

The injectable liquid composition of the present invention comprises a polyol and / or an organic polyamine compound as the component (A),
(B) an organic polyisocyanate compound as a component and
As a component (C), it basically consists of 3 liquids of water, usually (A)
A mixture of the ingredient and the ingredient (C) is mixed in advance with the ingredient (B) immediately before being poured into rock. As a mixing method, a known method can be adopted.

In the present invention, the curing time is 10 in terms of stabilization of unstable ground, water blocking effect and work efficiency.
Seconds to 10 minutes, preferably 10 seconds to 5 minutes are preferable. The curing time can be adjusted mainly by adjusting the type and blending amount of the catalyst.

When the chemical composition of the present invention is used,
No scorch or fire is generated, injection workability is improved, it is economical, and a urea bond with a foaming ratio of about 1.5 to 30 times, which is excellent in strength, void sealing effect, stability strengthening effect, and durability. Since a rigid urethane foam solidified body is mainly formed, the rock, the ground, and the artificial structure are stably strengthened, the voids are sealed, and the water is stopped very well.

A special injectable drug solution in the present invention (A)
Injectable chemical composition consisting of component, (B) component and (C) component is injected into soft or unstable ground with many voids and cracks, rock, fracture zone layer, and artificial structures with cracks and voids. Although it is solidified, the method of solidification by injection is not particularly limited, and a known method can be adopted. For example, (C) component was added.
Using a comparative blending pump that can control the injection amount, pressure, blending ratio, etc. of component (A) and component (B), separate (A) component with (C) component and (B) component separately. A rock bolt with a hole that is installed in a tank and has a built-in static mixer, check valve, etc., fixed in advance at a predetermined location (for example, a plurality of holes drilled at intervals of 0.5 to 3 m) such as rock. Each component in the tank was injected at an injection pressure of 0.5 to 50 kg / cm ² · G through an injection rod, and a predetermined amount of component (C) was added through a static mixer (A).
There is a method in which the component and the component (B) are uniformly mixed, and the mixture is injected and infiltrated into a predetermined unstable rock or ground to be hardened to stabilize and solidify.

When pouring into the roof of a tunnel, for example, a hole is drilled at a predetermined interval of, for example, about 2 m using a 42 mmφ bit with, for example, a jumbo machine to obtain a depth of 2 m and a boring angle. An injection hole of 10 to 30 ° is provided, and a lock bolt having a static mixer inserted therein is inserted into the injection hole, and the mouth of the lock bolt is a waste cloth, a quick-setting cement, or a foamed hard material to prevent backflow of the injected chemical solution. It is preferable to seal using a waste cloth or the like impregnated with a urethane resin in advance, and then inject the chemical liquid by the method described above. The injection work is terminated when the injection pressure rises sharply or when the injection amount of about 20% by volume more than the predetermined injection amount is injected. Generally, 30 to 20 chemicals per injection hole
You can inject 0 kg.

When backfilling and filling the clearance (on average about 5 cm) between the ground and the shield segment in the shield construction, a single tube rod with a static mixer is installed in the injection holes set at regular intervals inside the shield segment. And added (C) ingredient in the same manner as above.
The components (A) and (B) are injected in a fixed amount at a predetermined mixing ratio. In addition, stable strengthening water stoppage such as cracks in artificial structures is, for example, for the crack surface, drilled to a diameter of 10 mm and a depth of 5 to 10 cm at intervals of 20 to 50 cm to remove shavings in the holes. Blow out the dust with compressed air, put absorbent cotton on the drilled hole to a thickness of about 5 mm, and then from it, about 10 mm in diameter and 20 to 30 mm in length.
Drive the injection pipe of and set it so that the injected chemical does not leak. For cracks and leaks, U-shaped or V-shaped cuts should be made at a pitch of approximately 30 cm, and the injection pipe should be fixed with quick-setting cement. Next, pass a Y-tube or T-tube with a static mixer inside,
Injecting pressure of 0.5 to 20 kg / cm ² · G, preferably 0.5 to ² kg of (A) component plus (C) component and (B) component at a prescribed blending ratio using a proportional blending pump or a hand pump. /cm
Inject a specified amount of ²・ G. The injection volume may generally be the estimated void volume plus α.

The stable water-stop construction method of the present invention does not cause scorch or fire due to heat generation during injection and solidification of a chemical solution, has low viscosity of the chemical solution, and has permeability to unstable ground, cracks, crush zones, etc. It is possible to stabilize unstable rocks and ground over a wide range, and also to stabilize artificial structures and stop water. In addition, the formed cured solid has high strength and durability, is excellent in adhesion to and adhesion to bedrock, and is economical, and is therefore practical.

Hereinafter, the present invention will be described in more detail based on production examples and examples, but the present invention is not limited to these examples.

Production Examples 1 to 7 and Comparative Production Examples 1 and 2 The components (A) and (B) shown in Table 1 were separately prepared, and water was mixed with the component (A). The component (B) was added to and mixed with the component under stirring.

Time from gelling to gelation (gel time), rise time, compression test of the obtained solid (J
As a result of IS R 5201), Table 1 shows the density (JIS K 5400), the temperature due to the heat of reaction, and the presence or absence of scorch.

[0047]

[Table 1]

The abbreviations in Table 1 are as follows.

(Polyol) GP-350: Triol having a weight average molecular weight of 350 obtained by addition-polymerizing propylene oxide to glycerin [hydroxyl value 480 mgK
OH / g] G-1000-30: Propylene oxide is addition-polymerized to glycerin, and then ethylene oxide is further addition-polymerized at the terminal to give triol having a weight average molecular weight of 1000 and a repeating unit ratio of 30% by weight derived from ethylene oxide [ Hydroxyl value 168 mgKOH / g] EDA-2P: Tetraol with a weight average molecular weight of 272, obtained by adding 2 mol of propylene oxide and 2 mol of ethylene oxide to 1 mol of ethylenediamine [hydroxyl value 825 mgKOH / g] TEG: triethylene glycol [hydroxyl value 753 mgKOH / g g] So-850: Polyol obtained by addition-polymerizing propylene oxide to sorbitol and having a weight average molecular weight of 850 [hydroxyl value 400 mgK
OH / g] GE-300: Triol with a weight average molecular weight of 300 obtained by addition-polymerizing ethylene oxide to glycerin [hydroxyl value 561mgKOH /
g] DR-2000: Propylene glycol with ethylene oxide /
Propylene oxide = 80/20 (weight ratio) Addition polymerization of mixed alkylene oxide Weight average molecular weight 2000 diol [Hydroxyl value 56 mg KOH / g] GEM-300: Glycerin with ethylene oxide addition polymerization triol of weight average molecular weight 300 is anhydrous Modified polyol partially esterified with maleic acid [hydroxyl value 400mgKOH
/ g] TEA: Triethanolamine [hydroxyl value 1130mgKOH / g] (foam stabilizer) DKS Silicone D332: Dai-ichi Kogyo Seiyaku Co., Ltd., modified polysiloxane (catalyst) Dabco 33LV: Triethylenediamine dissolved in dipropylene glycol [Concentration 33% by weight] DBTL: Dibutyltin dilaurate (polyisocyanate) C-MDI: Polymethylene polyphenyl polyisocyanate (NCO group content 32% by weight) So-MDI: Weight of sorbitol added with propyne oxide A modified C-MDI was produced by adding and reacting 5 parts of a polyol having an average molecular weight of 1000 into 95 parts of C-MDI under heating and stirring,
Propylene carbonate (5 parts) was added to 100 parts of the modified C-MDI and diluted [NCO group content 27% by weight] DP-MDI: 4 parts of dipropyne glycol was added to 96 parts of C-MDI, Diluted by adding 5 parts of ethylene glycol diacetate to modified C-MDI heated and reacted [N
CO group content 26% by weight] C-3053: Nippon Polyurethane Industry Co., Ltd., Coronate 30
53 [Water-dispersible C-MDI, NCO group content 29% by weight] (Additive) SBR: Styrene-butadiene resin emulsion [nonvolatile content 40% by weight] EVA: Ethylene-vinyl acetate resin emulsion [nonvolatile content 45% by weight] Example 1 Fifteen holes were drilled in a tunnel roof having a crush zone using a jumbo machine with a 42 mmφ bit at 2 m intervals at a drilling angle of 25 to 35 ° (angle with respect to the tunnel excavation direction). Carbon steel (JIS G 3445, STKM 17C) injection bolt (outer shape)
27.2 mm, inner system 15 mm, length 3 m, static mixer and check valve internal) were inserted, and a knitted cloth made by impregnating about 30 cm of the mouth with a two-component hard urethane foam resin was pressed with an iron rod to seal it.

Then, to each of the fixed injection holes, the chemical solution obtained in Production Example 2 in Table 1 was injected at an injection pressure of about 5 to 10 kg / cm ^2.
-In G, about 80 to 120 kg was injected per hole.

About 120 minutes after the chemical solution was injected, the state of improvement of the ground was examined by excavation. As a result, the consolidation range was a hemispherical shape with a radius of 2 m, and the consolidation was stabilized.

The solidified portion of injection is sampled with a sampler of 5 cmφ × 10 cm
It was 55 kg / cm ² when the uniaxial compressive strength was measured by sampling in the shape of a cylinder. Sampling was not possible in the unimproved area because of the shatter zone. As a result, the effectiveness of the drug solution of the present invention was sufficiently proved, and it was revealed that a consolidation stabilizing layer was formed.

Example 2 In order to stabilize the tunnel roof part of the granite crush zone having large voids, stabilization was carried out by injection of a chemical solution in Production Example 6 in Table 1. The construction method was the same as in Example 1.

That is, ten injection holes each having a depth of 2 m were drilled at intervals of about 2 m by using a 42 mmφ bit on the roof with a jumbo machine. The drilling angle was 20 °. A carbon steel lock bolt similar to that used in Example 8 (JIS G 3455, STKM 1
7C) was inserted and the mouth was sealed in the same manner as in Example 1.

70 to 110 kg (injection pressure 30 to 50 kg / cm ² · G) of the chemical solution of Production Example 6 in Table 1 was injected into each injection hole. Approximately 150 minutes after injecting the chemical solution, we dug around the injection hole and inspected it to check the stabilization status of the ground,
The consolidation area is a hemisphere with a radius of about 2 m, and
The large voids were dense and well sealed. In addition,
For reference, the single solidified portion of the chemical liquid of Example 6, which is sealed and solidified with a particularly large void portion, is 5 cmφ × with a sampler.
When the uniaxial compressive strength was measured by core sampling in a 10 cm columnar shape, it was 130 kg / cm ² .

Example 3 A crack was generated in the flat floor and the rising corner portion of the roof brick floor of a two-story building made of reinforced bricks, and water was leaking downstairs during rainfall. For this crack, use a drill with a diameter of 10 mm to drill 50 holes with a depth of about 5 cm at a pitch of about 30 cm, blow off the shavings and dust in the holes with compressed air, and then remove the absorbent cotton on the holes. It was put on 5 mm thick and an injection pipe with an outer diameter of about 10 mm was hammered in from above with a wooden hammer. A Y-shaped tube equipped with a static mixer was set in an injection pipe, and the components (A) and (B) and water in Production Example 4 in Table 1 were added to component (B) / (A) +
About 1 to 3 liters of water was injected per hole by a manual injection pump at a ratio of water (weight ratio) of 2.1 / 1 to 2.3 / 1.

After the injection, the injection pipe was removed, a cork stopper was driven in, and mortar was applied to finish. After about two weeks, there was heavy rainfall, but no water leakage as before, and it was proved to be very effective for crack sealing and water stopping.

[0058]

INDUSTRIAL APPLICABILITY The injectable liquid composition of the present invention and the stable water-stop construction method using the same have the following effects.

Even if a large amount of the injected chemical composition is injected, there is no risk of scorch fire due to heat storage.

Since a large amount of water is used, the viscosity of the injectable liquid chemical composition is low, the injecting operation is easy, and the permeability to soil is excellent.

Since water is added as an active ingredient, the cost is low and it is economical.

Since the strength of the solidified body is high, it is effective for the stable strengthening of unstable rock or ground.

As described above, the stabilized water stopping method using the injectable liquid chemical composition of the present invention has excellent characteristics, and it is possible to repair not only general mountain tunnels but also existing tunnels, urban civil engineering and shields. It is extremely effective for stabilizing and stopping water in construction work and repair work of artificial structures.

Claims (3)

[Claims] 1. A weight ratio of (A) polyol and / or organic polyamine compound, (B) organic polyisocyanate compound, and (C) 100 parts by weight of the total amount of the (A) component and (B) component. An injectable liquid composition for stabilizing soil and the like, which is composed of more than 1 part of water. 2. The stabilizing injection liquid chemical composition according to claim 1, wherein a plurality of holes are formed in the rock or ground at predetermined intervals, hollow injection bolts are inserted into the holes, and the openings of the bolts are used for stabilization. A stable and water-stopping construction method for rocks or ground characterized by injecting an object into rocks or ground to solidify. 3. An artificial structure characterized in that an injection pipe is inserted into the artificial structure, and the stabilizing injectable liquid chemical composition according to claim 1 is injected into the artificial structure through the injection pipe to be solidified. Stabilization and waterproofing method for structures.