JPH11124576A - Process for grouting into ground and filler mixer/ejector for use therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process which comprises mixing a urethane grout for ground with a fine inorganic powder such as PS(paper sludge) ash and wherein the cost of applying the grout can be reduced by substituting a urethane grout with PS ash, and PS ash can be effectively used. SOLUTION: There are provided a process for grouting a two-package reactive grout comprising package A containing a polyol and package B containing an isocyanate into ground, which process comprises mixing package A with an inorganic fine powder such as paper sludge ash in a monopump to form a slurry, mixing the mixture with package B just before application with a static mixer 40 to form a setting grout and pouring this grout into ground and an apparatus used for this process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a ground filling filler for improving the strength of a ground, stopping water, fixing rock bolts, etc. by injecting and solidifying a chemical solution into cavities, voids or perforations in the ground. And a filler mixing and discharging device used in the method.

[0002]

Background of the Invention Conventionally, fillers for stabilizing the ground and fixing rock bolts include cement mortar,
Urethane chemicals and the like are used. Cement mortar has good workability and fillability, but has a large specific gravity of 2 or more.
Further, separation or bleeding of the material is liable to occur, and it takes several hours until the fluidity is lost. For this reason, where there is running water or spring water, the packing may flow out or run away. Furthermore, it takes 2-3 days for the initial strength to be obtained.

[0003] The urethane chemical is a two-liquid curable chemical mainly composed of a liquid A containing a polyol and a liquid B containing an isocyanate. Since foaming and curing proceed simultaneously in a short time, there is no problem such as outflow, the injection is easy, and the load on the periphery is small because the cured body is lightweight. However, there is a problem that construction costs are high because organic chemicals, particularly polyols, are expensive. It is conceivable to add an inorganic filler to the urethane-based chemical solution to reduce the amount of the chemical solution, but in general, mixing the chemical solution and the inorganic filler reduces the fluidity, so that a uniform mixture cannot be obtained or the injection step is blocked. Problems occur. Therefore, the composition and use of the urethane-based chemical-inorganic filler mixed chemical are extremely limited.

On the other hand, in recent years, there has been a problem in treating incineration residues (PS ash) of paper sludge discharged by a recycled paper making process. That is, in the recycled paper making process, pulp fibers are collected through a deinking process, a defibration process, and the like, and the recycled paper is made using the pulp fiber as a stock. In this process, a large amount of sludge is generated. Paper sludge
Or this waste called pulp sludge (pulp sludge) is made up of inorganic components such as fillers, sizing agents, pigments, etc. contained in waste paper and organic components such as fine fibers separated in the defibration process, When it is discharged into an environmental water system, it sludges and is usually incinerated. After separating this paper sludge, it is pulverized and dried with hot air, then put into an incinerator and incinerated at about 800 to 900 ° C.
It is S ash.

[0005] With the increase in the production of recycled paper, the amount of PS ash discharged has become enormous. However, PS ash is an alkaline powder composed of a fine powder or a brittle aggregate thereof. Therefore, if the PS ash is left outdoors or used for landfill, it scatters around and adversely affects the environment. For this reason, it is desired to develop a method for solidifying PS ash to prevent its escape into the environment and effectively using the processed product.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a urethane chemical for injection filling, which can obtain strength in a shorter time than mortar, even if a large amount of inorganic fine powder such as PS ash is mixed. It is an object of the present invention to provide a construction system for ground injection filler which does not cause problems such as blockage at the time, does not cause a decrease in strength of a cured body, and can achieve a reduction in construction cost using a urethane chemical.

[0007]

DISCLOSURE OF THE INVENTION The present inventors have studied in view of the above-mentioned problems, and as a result, have a liquid A containing an inorganic fine powder and a component having reactivity with isocyanate and a liquid B containing isocyanate. In the two-component reaction type chemical injection method for ground injection, after mixing the liquid A and the inorganic fine powder into a mixed slurry using a monopump, the mixed slurry and the liquid B are mixed using a static mixer immediately before filling. According to the method of forming a mixed chemical solution and injecting it into the ground, the inorganic fine powder component such as PS ash can be stably mixed up to about 1/3 of the total amount of the chemical solution. A significant cost reduction of the method can be realized.

Accordingly, the present invention provides the following ground injection method and injection apparatus. (1) A liquid obtained by mixing a liquid A containing a component which is cured by the reaction with an isocyanate and an inorganic fine powder into a slurry in a monopump, and mixing the slurry with a liquid B containing an isocyanate in a static mixer. A method for constructing a ground filling filler, comprising injecting a liquid into the ground. (2) The method for constructing a ground filling filler as described in (1) above, wherein the liquid A contains water glass as a component which is cured by the reaction with the isocyanate. (3) The method for filling a ground filling filler according to the above (1) or (2), wherein the liquid A contains a polyol as a component which is cured by a reaction with the isocyanate. (4) The method for constructing a ground filling filler according to any one of (1) to (3), wherein the inorganic fine powder is used up to 50% by weight based on the total amount of the injected chemical liquid. (5) The method according to any one of (1) to (4) above, wherein the inorganic fine powder is paper sludge ash and / or fly ash. (6) The above-mentioned 1 to 5 wherein the liquid A further contains a surfactant.
The method for constructing a ground filling filler according to any one of the above.

(7) A lock bolt fixing method according to the filler application method described in any one of (1) to (6) above. (8) A first liquid reservoir 15 for storing a liquid A containing a component which is cured by a reaction with an isocyanate, a second liquid reservoir 25 for storing a liquid B containing isocyanate, and a first liquid reservoir 15 in the first liquid reservoir 15. A monopump 11 having a liquid supply section 13 and an inorganic powder input section 12a connected via a pump section 14 of the second type;
Through the liquid pump 27a and the mono pump 1
A static mixer 40 having a slurry injection section 18a connected to the first discharge end 11a and a mixed filler slurry discharge port 50.
A filler mixing and discharging apparatus used in the construction method according to any one of the above. (9) The filler mixing / discharging device according to the item 8, wherein the static mixer is built in the injection rod.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The ground injection method of the present invention basically comprises an aqueous solution containing a component which reacts with an isocyanate and cures, an inorganic fine powder such as PS ash, and an isocyanate. This is a urethane-based chemical liquid filling and filling method in which a mixture of liquid B containing as a main component is injected into the ground. In the conventional method that does not include the inorganic fine powder in the injection liquid, the liquid A and the liquid B
The liquid is mixed with a static mixer and injected into the ground (Fig. 1 (a)). In this method, when the inorganic fine powder is added to the liquid A (FIG. 1 (b)), clogging occurs in the stirring mixer or the static mixer. Therefore, as described above, the addition amount of the inorganic fine powder is limited to 20%. . On the other hand, in the method of the present invention, the liquid A and the inorganic fine powder are mixed in advance in a monopump to form a mixed slurry, and the mixed slurry is guided from the monopump to a static mixer, where it is mixed with the liquid B, and mixed with the ground. (FIG. 1 (c)). According to this method,
30% by weight or more of inorganic fine powder added to the total chemical volume
Even when the content was increased to about 50% by weight, an unexpected result was obtained in which no blockage of the pump / pipe occurred during the mixing and injection process.

Although the monopump is a kind of screw pump, it has a high conveying force, but the substance to be conveyed is apt to remain in a screw groove or the like after the conveyance is completed. For this reason, maintenance after use is troublesome, but in the present invention, only inorganic fine powder and liquid A, which are both water-soluble or water-dispersible substances, are sent into the monopump. Dirt can be easily washed away. Therefore, the handling and maintenance of the apparatus are easy and highly practical.

Hereinafter, a mixed slurry of a liquid A and an inorganic fine powder;
The liquid and a mixed injection system thereof, particularly a method of fixing a lock bolt, which is a preferable application example thereof, will be described in detail. (I) Liquid A-Inorganic Fine Powder Mixed Slurry The mixed slurry is composed of Liquid A component and inorganic fine powder. (1) Liquid A component The main component of Liquid A is an aqueous solution containing a component that reacts with isocyanate and cures. The most typical component for such a component is a polyol. The type of polyol that can be used in the present invention is not particularly limited, but examples of useful polyols include ethylene glycol, propylene glycol (1,2-propanediol), 1,3-propanediol, and 1,3-butanediol. And diols such as 1,4-butanediol, neopentyl glycol and hexylene glycol (hexanediol). Further, as long as it is a polyol which reacts with an isocyanate component to form a polyurethane resin and has two or more hydroxyl groups in a molecule, a compound other than a normal ether-based or ester-based polyol can be used.
Examples of such polyols include triols such as glycerin, trimethylolethane, and trimethylolpropane, and polyfunctional polyols such as castor oil.

Further, polyols obtained by adding ethylene oxide, propylene oxide, ethylene propylene copolymer, etc. to these compounds or sugars such as sorbitol and sucrose can also be used. For example, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycol, polypropylene glycol, ethylene oxide-propylene oxide copolymer, glycerin trioxybutane, polyoxypropylene triol and the like can be mentioned.

Further, a polyol containing an amino group is also preferably used. Examples of such polyol compounds include diethanolamine, monoamines such as triethanolamine, and monoethanolamine, ethylenediamine, diethanolamine, triethanolamine,
Adducts obtained by adding ethylene oxide or propylene oxide to amines such as triethylenediamine and the like can be given.

The liquid A preferably contains water as a diluting liquid to the extent that the liquid does not adversely affect the curing reaction. The addition of water can increase the fluidity and reduce the amount of the polyol used to reduce the cost. However, if the dilution water is excessive, the inorganic fine powder to be added is separated,
At the time of the injection, there are problems such as that water is absorbed into the ground and the strength of the cured product is reduced by the reaction with the solution B. Therefore, the amount of water in the solution A is preferably 10 to 90% by weight of the total amount of the solution A.
The content is preferably 0% by weight or less.

In order to smoothly proceed with the reaction with the solution B, it is preferable to add a curing catalyst to the solution A. Examples of such catalysts include tertiary alkylamines such as dimethyloctylamine, dimethyllaurylamine, morpholine, and piperazine, and cyclic amines, dibutyltin dilaurate, triethylenediamine, imidazole, monoethanolamine, diethanolamine, triethanolamine, and the like. Water-soluble amine, betaine or imidazole type catalysts and the like can be mentioned. The addition amount of the curing catalyst is in the range of 0.1 to 20% by weight, preferably 0.5 to 10% by weight, based on the solution B.

Further, it is preferable to add a silicate such as water glass or a surfactant to the solution A. Water glass
This has the effect of compensating for the decrease in strength due to water dilution and hastening the generation of initial strength. The surfactant is useful for dispersing the inorganic fine powder in the drug solution, and also functions as a foaming agent and a fluidizing agent. Examples of such surfactants include anionic surfactants such as sodium salts, amine salts, ammonium salts, and alkyl phosphates such as alkyl sulfates, alkyl benzene sulfonates, ethoxy alkyl sulfates, and ethoxy alkyl benzene sulfates, and polyethylene glycol alkyls. Examples include nonionic surfactants such as ether. Among these surfactants, alkylamine oxides are preferred. The amount of surfactant added is based on additives such as inorganic fine powder and curing catalyst.
Preferably 100% by weight or less, more preferably 10 to 2%
0% by weight.

(2) Inorganic Fine Powder In the method of the present invention, PS ash is particularly preferably used as the inorganic fine powder. PS ash is a waste and can be obtained as an inexpensive raw material, which has a large effect of reducing construction costs. In addition, PS ash can be used as a useful resource by mixing it in a large amount up to about 1/3 of the total amount of the chemical solution. However, in the method of the present invention, inorganic fine powders other than PS ash can also be used. Examples of such inorganic fine powder include, but are not limited to, fly ash, blast furnace slag, silica, calcium carbonate, calcium sulfate, calcium sulfate (gypsum), clay, aluminum hydroxide, aluminum oxide, slaked lime, quicklime, and antimony trioxide. And inorganic fine particles selected from titanium oxide and the like. These inorganic fine powders including PS ash may be used as a mixture of two or more kinds.

(3) Production of Mixed Slurry Production of mixed slurry is performed in a monopump section of a mixing system described later. Usually, the preferred mixing ratio of powder: liquid A is 1: 0.5 to 1: 2, more preferably 1.2: 0.8 to 0.8:
It is in the range of 1.2. If the amount of the powder is used at a ratio equal to or more than the upper limit value, a problem occurs in conveying and pouring the slurry. When used at a ratio below the lower limit, the cost reduction effect is reduced.

(II) Component B The component B is not particularly limited as long as it is an isocyanate which reacts with the polyol of the solution A to form a cured product, but a hydrophilic isocyanate is preferred. Primary MOH, self-emulsifying in water, made from polymeric MDI and monomeric MDI
Are preferred. Examples of the polyisocyanate used for producing such a prepolymer include diphenylmethane diisocyanate, 1,4-butane diisocyanate, dicyclohexylmethane diisocyanate, 1,6-hexane diisocyanate, cyclohexane diisocyanate, and 1,5-bisisocyanate.
Aliphatic diisocyanates such as 1,3,3-trimethylcyclohexane, m-xylylene isocyanate, 1,3-bis- (isocyanatomethyl) benzene and methylcyclohexane diisocyanate, 2,4- or 2,
Examples thereof include 6-tolylene diisocyanate, m- or p-phenylene diisocyanate, and 1,5-naphthylene diisocyanate. Diphenylmethane diisocyanate is particularly preferred. Diphenylmethane diisocyanate has various isomers, and any of them can be used. These mixtures may be used.

The prepolymer is obtained by reacting the above-described isocyanate with a polyalkylene glycol. Such polyalkylene glycols can be polyethylene glycol or ethylene oxide (EO)-
A propylene oxide (PO) copolymer is used. The optimal mixing ratio of the mixed slurry (comprising A liquid + inorganic powder) and B liquid varies depending on factors such as the content of the A liquid in the slurry, the viscosity of the slurry, and the required curing time. In the range of 3: 1 to 0.5: 1, more preferably
The range is 1.8: 1 to 2.2: 1. If the amount of the slurry is excessive, there is a problem that the injection into the ground does not proceed smoothly or the hardening after the injection becomes insufficient. Even if the liquid B is excessive, the curing after the injection becomes insufficient.

(III) Mixing and Injection System The mixing of the liquid A and the inorganic fine powder, and the mixing and injection of the mixed slurry obtained thereby and the liquid B are performed by the system illustrated in FIG. The system of FIG. 2 basically includes (1) a premixing section (mixed slurry forming section), (2) a final mixing section (injected drug solution forming section), (3) a control section, and (4) an injecting section. Hereinafter, each unit will be described.

(1) Premixing Section (Mixed Slurry Forming Section) The mixed slurry forming section has an inorganic powder charging section 1 at one end.
2a and a monopump 11 having a liquid injection section 13; a pump means 14 connected to the liquid injection section 13 via a liquid transport pipe 17; and a pump for storing the liquid A connected to the pump means 14 via a liquid transport pipe 16. One reservoir 15 is provided. The pump unit 14 is electrically connected to the control unit 30, and under the control of the pump unit 14, absorbs a required amount of the liquid A from the first liquid reservoir 15 and sends the liquid to the monopump 11. Stirring means may be provided in the inorganic powder receiving hopper 12 in order to avoid solidification of the powder. The lower portion of the hopper 12 is connected to the inorganic powder input section 12a of the monopump, and feeds the inorganic powder into the monopump by gravity or by the action of the stirring means. Hopper 1
The introduction of the powder into 2 may be appropriately performed while observing the consumption. If necessary, in the hopper or at the connection with the monopump, a measuring means is provided for measuring the powder consumption,
Information on the powder consumption may be sent to the control unit 30.

The liquid injection section 13 may have a conventional structure in which a resin or steel liquid transfer pipe 17 is fixed in a threaded structure. The pump unit 14 is not particularly limited as long as the pump unit 14 can adjust the liquid sending amount according to the control signal. For example, a rotary pump, a plunger pump, or the like is used.

The monopump 11 is made of a metal and basically has a male screw-type rotor (rotor) having a circular cross section, and an elastic section having an elliptical cross section (generally, a shape obtained by adding a semicircle to both ends of a rectangle). The rotor is mounted inside a stator (stator) made of a material, and the rotor rotates eccentrically in the stator. As the rotor rotates, the material in the rotor and stator is transported by the screw principle. In addition, the monopump is a conventional pump that conveys a viscous substance such as chocolate, butter, and asphalt, and such a monopump can be used in the present invention. The inner diameter, length, rotor pitch and the like vary depending on the composition of the slurry, but usually, an inner diameter of about 5 to 10 cm, a length of about 0.1 to 1 m, and a rotor pitch of about 1 to 20 cm can be used.

In the present invention, by using a monopump characterized by one of the features that the shear stress is small, the mixing of the inorganic powder and the liquid A proceeds smoothly in the pump,
In addition, the mixture slurry can be discharged without blockage. In addition, since the monopump has a strong and stable conveyance force, the discharge amount per unit time is stable, and further,
No blockage or the like occurs in the mixing portion with the solution B located after the monopump 11. The control unit 30 is electrically connected to the pump unit 14, and controls the pump unit 14 by manual operation of an operator or automatically based on information on the amount of wet powder consumed sent from the hopper 12, The amount of liquid absorbed from the first liquid reservoir (A liquid reservoir) 15 and the amount of liquid supplied to the monopump 11 are adjusted.

(2) Final Mixing Section (Injection Chemical Forming Section) A mixed slurry of the powder and the liquid A mixed in the monopump 11 is connected to the monopump discharge end 11a via a slurry transport pipe 18 through a slurry injection section. A static mixer 4 having a liquid injection portion 27a and a slurry discharge port 50 connected to a second liquid reservoir 25 for storing the liquid B via liquid transport pipes 26 and 27 and a pump means 24;
Guided to zero. The pump unit 24 is electrically connected to the control unit 30, and controls the pump unit 24 according to the amount of the mixed slurry by manual operation or based on information sent from the mixed slurry forming unit or the static mixer. The required amount is absorbed from the second reservoir 25 and sent to the static mixer 40. Static mixer 4
0 may be conventional. As shown in FIG. 2, it is preferable that the injection is carried out into the ground in combination with the mixing, and the static mixer 40 may be separately provided in front of the injection rod.

(3) Control Unit The control unit 30 is for absorbing a chemical solution from each reservoir and sending it into a monopump or a static mixer according to preset conditions. Practically, it is installed in a single housing together with the pumping means 14 and 24 of the liquid A and liquid B sending systems, and by providing a control panel on the surface of the housing, the state of the liquid type, the amount of liquid sent, etc. Various operations such as display, switching of liquid type, adjustment of the liquid sending amount, and switching of operation mode (for example, manual operation, automatic operation mode, etc.) are performed in an integrated manner.

(4) Injection part As described above, the finally obtained liquid A + inorganic fine powder + B
The liquid mixture is injected and filled into the ground or perforations. Conventional injection means can be used for the injection. For example, an injection rod, a hollow lock bolt, a filling hose, or the like can be used. The length of the injection rod or the like depends on the amount of the inorganic fine powder, but generally a long rod of about 5 to 10 m can be used. As described above, it is preferable to use a rod or lock bolt with a built-in static mixer.
The above description is for describing a typical example of the system, and the configuration of each unit within the technical idea of the present invention,
In particular, it is possible to change and modify the configuration of the final mixing section, control section, and injection section.

(IV) Construction Method The construction method of the present invention is also effective for improving the strength of the ground and stopping water by injecting and solidifying a chemical solution into the cavities and voids of the ground, particularly, Useful for fixing rock bolts to ground. In the lock bolt method, a hole is formed in a wall surface and / or a roof of a tunnel, and a lock bolt as a support member is inserted and fixed in the hole. Usually, as shown in FIGS. 3 (a) and 3 (b), they are installed almost radially as viewed from the extension axis of the tunnel 60. By providing the lock bolt 70, a force corresponding to the tensile force acts on the tunnel wall surface as an internal pressure, whereby the ground 100 near the tunnel in a biaxial stress state is maintained in a triaxial stress state. As a result, a decrease in the strength or the load carrying capacity of the ground is prevented (internal pressure effect). In addition, the ground around the tunnel, which is integrated by the internal pressure effect and has increased load carrying capacity, forms a ground arch by being uniformly displaced inward. Further, the insertion of the lock bolt also has the effect of increasing the shear resistance of the ground.

In order for the lock bolt method to exhibit a sufficient effect, it is necessary to securely fix the lock bolt in the ground 100. For this reason, a method is generally adopted in which the lock bolt is entirely bonded to the ground (the inner surface of the perforation). Specifically, (i) a method of hardening the cement mortar by inserting a lock bolt into the perforated hole in which the cement mortar is injected, (ii) a bag filled with the cement mortar or the resin-based adhesive is placed in the perforated and placed, A method in which the bag is broken by inserting a lock bolt to fill and fix the fixing material in the hole, or (iii) after being inserted into the hole previously drilled, or by using a driving or self-drilling lock bolt. There is a method in which a fixing material is injected around the rock bolt after being poured into the ground. The method (i) cannot be applied to a mountain with many springs. The method (ii) has a feature that the fixing can be surely performed, but has a problem that the construction cost is high. In addition, in order to carry out these methods, the ground must be such that the hole can be made independent.

The construction method according to the present invention comprises the above (i) and (ii)
It is suitable for use in i), particularly in the lock bolt fixing method of (iii). The fixing method (iii) can also be applied to an upwardly constructed portion as shown in the side sectional view of FIG. 3 (b). It has a great feature that it can be applied to For this reason, the fixing of the rock bolt according to the method of the present invention can be carried out in various grades of ground from a ground with high independence of drilling to a soft ground with low independence. . When the method of the present invention is used for fixing a rock bolt,
After the lock bolt 70 is inserted into the hole 90 formed therein, the lock bolt 70 is driven or self-drilled, and then the fixing solution containing the inorganic fine powder is injected into the hole according to the method described above. The injection can be performed through the tube portion 75 when a hollow lock bolt is used (FIG. 4).
(a)). When a solid lock bolt is used, a filling hose or a small-diameter injection pipe 80 may be provided on the side of the lock bolt (FIG. 4B), and the injection may be performed through this.

The lock bolt is usually a high-strength rod or cylindrical member such as steel or FRP, but the method of the present invention is suitable for fixing a cable bolt made of a PC steel stranded wire or a high-strength resin wire. Can also be used. As described above, the method of the present invention for applying a ground filling filler material is described for fixing a rock bolt. However, the method of the present invention can also be used for filling a ground or repairing a crack in a concrete building.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for constructing a ground filling filler according to the present invention will be described below with reference to examples. In the following examples, the compressive strength is determined by the compressive strength test method for concrete (JIS-A1108).
Is a value measured for the cured product according to Example 1 PS ash 100 parts, polyol (polypropylene glycol (OH value 500)) 15 parts, curing catalyst (amine type) 1
Parts, 2 parts of surfactant and 82 parts of water glass with a monopump (φ50 mm, total length: 30 cm, rotor pitch: 5)
cm) to prepare a mixed slurry. On the other hand, a cylindrical injection rod having two injection holes at the end and incorporating a static mixer (inner diameter: 10 mm, length: 3 m)
Is prepared, and the mixed slurry and isocyanate (MDI polyalkylene glycol prepolymer) are injected through the injection hole.
The B solution containing the mixture is supplied at a mixed slurry: B solution supply ratio of 2: 1.
(Weight ratio). The discharge from the injection rod was a liquid in which the liquid A, the liquid B and the PS ash were uniformly mixed, and a discharge of 10 liters per minute could be realized.

When the discharged material was injected into a transparent acrylic tube (internal volume: 0.01 m ³ ) which was regarded as a perforated hole, the filling was completed without blocking the injection rod. After the curing was completed, the cured product was cut out and the interior was observed. As a result, the PS ash was uniformly dispersed and fixed. The cured polyurethane body had a uniaxial compressive strength of 200 kgf / cm ² and a specific gravity of 1.2.
Met. The curing time is about 30 minutes after mixing the mixed slurry and the B liquid. After the discharge was completed, the inside of the monopump was washed with water and observed for disassembly. As a result, the residual slurry in the monopump was completely drained. Therefore, the construction method of the present invention can be carried out without problems even in a site where the use of the organic cleaning liquid is restricted.

Comparative Example 1 Using the same liquid A and PS ash as in Example 1, a mixed liquid A-PS ash was prepared by a stirrer and mixed with liquid B at a ratio of 2: 1.
(Weight ratio), and supplied into a static mixer. When the weight ratio of PS ash to the liquid (liquid A + liquid B) was changed and the discharge state from the inside of the static mixer was examined, it was difficult to discharge when the weight ratio of PS ash / (liquid + PS ash) was 15%. %, The discharge was intermittent even if the chemical solution supply pressure was increased, and it was confirmed that stable injection and filling were impossible.

Example 2 A mixed slurry was prepared in the same manner as in Example 1 except that 100 parts of fly ash was used instead of PS ash, and the supply ratio of the slurry: B solution was changed to 2: 1 (weight ratio). A filling experiment was performed as in Example 1. The filling was completed without causing the injection rod to be blocked, and after the completion of curing, the cured product was cut out and the interior was observed. As a result, the inorganic fine powder was uniformly dispersed and fixed. Further, the uniaxial compressive strength of the cured polyurethane body was 200 kgf / cm ² , and the specific gravity was 1.2.

[0038]

According to the method of the present invention, the amount of expensive organic chemicals used can be reduced, so that the injection filling method can be carried out at a lower cost. Further, since PS ash, which conventionally has a problem in waste disposal, can be used as a raw material of inorganic fine powder, its practical significance is extremely large. further,
The effect of improving the strength of the cured polyurethane can also be obtained by adding the inorganic fine powder. In particular, it is useful as a fixing method of a lock bolt.

[Brief description of the drawings]

FIG. 1 shows a filler mixing process according to the conventional method (a), the comparative method (b) and the method (c) of the present invention.

FIG. 2 shows a schematic configuration of an example of a drug solution filling and filling system of the present invention.

FIG. 3 is a cross-sectional view schematically illustrating a driving mode of a lock bolt.

FIG. 4 is a cross-sectional view schematically illustrating a filling mode of a lock bolt fixing solution.

[Explanation of symbols]

11 Monopump, 12 Powder hopper, 13
Liquid injection part, 14 pump means, 15 first reservoir (A
Liquid reservoir, 16, 17 liquid transport pipe, 18 slurry transport pipe, 24 pump means, 25 first liquid reservoir (B liquid reservoir), 26, 27 liquid transport pipe, 30 control unit, 40 static mixer, 50 mixed filler Slurry outlet, 60 tunnel, 70 rock bolt, 75 hollow part, 80 injection pipe, 90 perforation, 100 ground

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI // (C04B 28/26 24:28) C09K 103: 00 (72) Inventor Kenji Nagatsu Komaki City, Aichi Prefecture Tsu 3600 No.Tokai Rubber Industries Co., Ltd. (72) Inventor Osamu Wakisaka Omaki Komaki City, Aichi Prefecture Kita-gaiyama character 3600 No.Tokai Rubber Industries Co., Ltd. Japan Construction Mechanization Association Construction Mechanization Laboratory

Claims (9)

[Claims] 1. A slurry obtained by mixing a liquid A containing a component which is cured by a reaction with an isocyanate and an inorganic fine powder in a monopump, and mixing the slurry with a liquid B containing an isocyanate in a static mixer. And filling the ground mixture with the ground liquid. 2. The method according to claim 1, wherein the liquid A contains water glass as a component hardened by the reaction with the isocyanate. 3. The method according to claim 1, wherein the liquid A contains a polyol as a component which is cured by a reaction with the isocyanate. 4. The method according to any one of claims 1 to 3, wherein the inorganic fine powder is used in an amount of up to 50% by weight based on the total amount of the injected chemical solution. 5. The method according to claim 1, wherein the inorganic fine powder is paper sludge ash and / or fly ash. 6. The method of claim 1, wherein the liquid A further contains a surfactant. 7. A method for fixing a rock bolt according to the method for applying a filler according to claim 1. Description: 8. A first liquid reservoir 15 for storing a liquid A containing a component which is cured by a reaction with isocyanate, a second liquid reservoir 25 for storing a liquid B containing isocyanate, and the first liquid reservoir 15. A monopump 11 having a liquid supply unit 13 and an inorganic powder input unit 12a connected via a first pump unit 14, and a liquid pump connected to a second liquid reservoir 25 via a second pump unit 24 Injection section 1 connected to the section 27a and the discharge end 11a of the monopump 11
The filler mixing and discharging apparatus used in the construction method according to any one of claims 1 to 7, further comprising a static mixer (40) having a mixing filler (8a) and a mixed filler slurry discharging port (50). 9. The filler mixing and discharging device according to claim 8, wherein the static mixer is built in the injection rod.