JPH11124577A - Process for grouting into ground and apparatus 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 effective 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 to form a wet powder, mixing the powder with package B just before application in a monopump 11 to form a slurry 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]

2. Description of the Related Art Conventionally, a cement-based mortar, a urethane-based chemical, or the like has been used as an injection filler for stabilizing the ground and fixing a rock bolt. Cement mortar has good workability and fillability, but has a large specific gravity of 2 or more. Also,
A large amount of water is used to improve the filling property.However, separation and bleeding of the material are likely to occur, and it takes several hours until the fluidity is lost. You may run away. Furthermore, it takes 2-3 days for the initial strength to be obtained.

[0003] The urethane chemical is a two-part curable chemical composed of a liquid A containing a polyol and a liquid B containing an isocyanate. Because foaming and curing proceed simultaneously in a short time,
There is no problem such as outflow. Injection is also easy. Moreover, the load on the periphery is small since the cured body is lightweight. However, the organic chemical solution has a serious problem that the construction cost is high because the component compounds are expensive. It is conceivable to add an inorganic filler to the urethane-based chemical to reduce the amount of the chemical,
In general, when a chemical solution and an inorganic filler are mixed, there is a problem that a uniform mixture cannot be obtained due to a decrease in fluidity, and a clogging occurs at an injection stage. 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 found that a two-pack reaction type ground injection for liquid A composed of a liquid A containing inorganic fine powder and polyol and a liquid B containing isocyanate. In the chemical liquid injection method, after the liquid A is added to the inorganic fine powder to form a wet powder, the wet powder and the liquid B are mixed using a monopump immediately before filling to form a slurry chemical, It has been found that by injecting this into the ground, it is possible to mix and inject inorganic fine powder components such as PS ash up to 40% by weight or more based on the total amount of the chemical solution, and have completed the present invention.

Accordingly, the present invention provides the following ground injection method and injection apparatus. (1) After the liquid A containing the polyol is added to the inorganic fine powder to form a wet powder, the wet powder and the liquid B containing the isocyanate are mixed in a monopump to form a slurry-like liquid chemical on the ground. A method for constructing a ground filling filler, characterized by injecting. (2) The method according to the above (1), wherein the inorganic fine powder is used in an amount of up to 50% by weight based on the total amount of the slurry drug solution. (3) The method according to the above (1) or (2), wherein the inorganic fine powder is fly ash and / or paper sludge ash. (4) A lock bolt fixing method according to the filler application method according to any one of (1) to (3).

(5) Monopump 11 having hopper 12 for charging wet powder and liquid injection section 13, liquid injection section 13
Pump means 14 connected to the
The pump means 14 comprises a B liquid reservoir 15 connected to the pump means 14 via a liquid transfer pipe 16, and a control unit 20.
Controlling the pump means 14 to feed the B liquid in an amount corresponding to the wet powder input amount from the B liquid reservoir 15 to the monopump 11. The equipment to use. (6) The apparatus according to the above (5), further comprising a cleaning liquid supply unit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The injection method according to the present invention basically involves injecting a mixture of a liquid A (polyol), an inorganic fine powder and a liquid B (isocyanate). In the conventional method in which the injection liquid does not contain inorganic fine powder, the liquid A and the liquid B are mixed by 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 static mixer. Therefore, the amount of the inorganic fine powder to be added is limited to 20% as described above. On the other hand, in the method of the present invention, the liquid A and the inorganic fine powder are mixed in advance into a wet powder, mixed with the liquid B in a monopump, and injected into the ground (FIG. 1 (c)). As a result, the amount of the inorganic fine powder added can be increased to 40% by weight or more.

Hereinafter, the wet powder, the liquid B, and a mixture injection system thereof will be described in detail. (I) Wet Powder The wet powder comprises the liquid A component and the inorganic fine powder. (1) Liquid A component The kind of the polyol which is the main component of the liquid A is not particularly limited. Examples of useful polyols include ethylene glycol, propylene glycol (1,2-propanediol), and 1,3-propane. Diols such as diol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, hexylene glycol (hexanediol) and the like can be mentioned. 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 or the like 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. However, among the polyether polyols, compounds having an OH value of about 300 or more are preferable.

Further, a polyol containing an amino group is also suitably 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 may be diluted with water to such an extent that the liquid does not adversely affect the curing reaction. The addition of water can increase fluidity and reduce the amount of polyol used, thereby reducing costs. However, if the amount of dilution is excessive, the inorganic fine powder to be added will be separated, water will be absorbed into the ground at the time of injection, and the strength of the cured product will decrease due to 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. In order to obtain sufficient strength, the amount of water is set to 60% by weight or less.
Preferably, the polyol content is at least 40% by weight.

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.

(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. Moreover, PS ash can be used as a useful resource in a large amount of up to 40% by weight or more based on 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 Wet Powder The production of wet powder is carried out by conventional solid-liquid mixing means. For example, a mixer such as a ball mill can be used.
The addition amount of the solution A to the inorganic fine powder is preferably 10 to
It is in the range of 70% by weight, more preferably 25-50% by weight. After mixing, they may be ground or dried as required.

(II) Liquid B Component The liquid B component is an isocyanate which reacts with the polyol of the liquid A to form a cured product. As such an isocyanate, a prepolymer containing a polymeric MDI or a monomeric MDI as a raw material and containing a self-emulsifying primary OH in water is preferable. Examples of the polyisocyanate used in the production of such a prepolymer include diphenylmethane diisocyanate, 1,4-butane diisocyanate, dicyclohexylmethane diisocyanate, 1,6-hexane diisocyanate, cyclohexane diisocyanate,
1,5-bisisocyanate-1,3,3-trimethylcyclohexane, m-xylylene isocyanate,
Aliphatic diisocyanates such as 3-bis- (isocyanatomethyl) benzene and methylcyclohexane diisocyanate, 2,4- or 2,6-tolylene diisocyanate, m- or p-phenylene diisocyanate;
Examples thereof include 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-mentioned isocyanate with a polyalkylene glycol. Such polyalkylene glycols can be polyethylene glycol or ethylene oxide (EO)-
A propylene oxide (PO) copolymer is used.

(III) Mixing Injection System The mixing of the wet powder and the liquid B is performed by a device including a monopump as a main part illustrated in FIG. The mixing apparatus shown in FIG. 2 includes a monopump 11 having a wet powder introduction hopper 12 and a liquid injection section 13 at one end, a pump means 14 connected to the liquid injection section 13 via a liquid transfer pipe 17, B connected to the pump means 14 via the liquid transfer pipe 16
It comprises a liquid reservoir 15 and a control unit 20, and controls the pump means 14 by the control unit 20 to feed an amount of the liquid B corresponding to the amount of wet powder charged from the liquid B reservoir 15 to the monopump 11. I do.

The wet powder charging hopper 12 may be provided with a stirring means in order to prevent the wet powder from solidifying. The lower portion of the hopper 12 is connected to the wet powder input section 12a of the monopump 11, and feeds the wet powder into the monopump by gravity or the action of the stirring means. Measuring means for measuring the consumption of the wet powder may be provided in the hopper or at the connection with the monopump, and information on the consumption of the wet powder may be sent to the control means 20.

The liquid injection section 13 may have a conventional configuration 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 oval cross section (generally, a shape obtained by adding a semicircle to both ends of a rectangular shape). The rotor is mounted inside a stator (stator) made of a material and rotates eccentrically inside the stator.
As the rotor rotates, the material in the rotor and stator is transported by the screw principle. In addition, the mono pump,
It is commonly used to transport viscous substances such as chocolate, butter, and asphalt, and such a monopump can be used in the present invention. The inner diameter, length, rotor pitch, etc. vary depending on the slurry composition,
Usually, an inner diameter of 5 to 10 cm, a length of 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 wet powder and the liquid B proceeds smoothly in the pump, and the slurry as the mixture is blocked. It was possible to discharge without any. In addition, since the monopump has a strong and stable conveyance force, the discharge amount per unit time is stable, and further, no clogging or the like occurs in the injection part located after the monopump 11.

The control unit 20 is electrically connected to the pump means 14 and controls the pump means 14 by manual operation or automatically based on information on the consumption of the wet powder sent from the hopper 12. The amount of liquid absorbed from the B reservoir 15 and the amount of liquid sent to the monopump 11 are adjusted. Usually wet powder: B
The preferred mixing ratio of the liquids is in the range of 1: 0.25 to 1: 6, more preferably 1: 0.5 to 1: 3. If the amount of the wet powder is used at a ratio equal to or more than the upper limit, a problem occurs in conveying and pouring the slurry. When used at a ratio below the lower limit, the liquid B becomes excessive. The mixed slurry of the wet powder and the liquid B mixed in the monopump 11 is injected from the discharge end into the ground without passing through a static mixer. For injection, an injection rod, a lock bolt, or the like may be used. An injection rod having a length of about 5 to 10 m can be used.

Further, it is preferable that the mixing apparatus of the present invention is provided with a cleaning liquid supply means. For example, as shown in FIG.
And the transfer pipe 16, the pump 24
In addition, the cleaning liquid can be supplied through the transfer pipe 27. In the monopump, a rotor having a male screw structure has a conveying force, but after the operation is completed, the mixed slurry adheres to the screw groove. If this mixed slurry is left as it is, it hardens and closes the screw groove, losing the conveying force of the monopump.Therefore, at the end of the mixing and discharging of the slurry, it is necessary to immediately clean the inside of the monopump. Immediately after the mixing and discharging of the slurry chemical solution, the chemical solution system is switched to the cleaning system, and the inside of the monopump can be cleaned.

In this case, the cleaning system may be partly common to the B solution sending system. For example, the pump means 14 and the B liquid reservoir 1
5, a switching valve may be provided, and the switching valve may be connected to the washing liquid reservoir. In this configuration example, the path including the pump means 14 is shared by the cleaning system and the B solution sending system. Practically, the pump means for the liquid B liquid supply system and the cleaning system are installed in a single housing together with the control unit, and a control panel is provided on the surface of the housing, so that the state of the liquid type and the amount of liquid supply can be improved. 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.

(IV) Construction Method The construction method of the present invention is also effective for injecting and solidifying a chemical solution into cavities and voids in the ground to improve the strength of the ground and to stop water. 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 adhered to the ground. 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 of the present invention comprises the steps (i) and (ii) described above.
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 lock bolt according to the method of the present invention can be carried out in various grades of ground from a ground with high self-sustainability to a soft ground with low self-sustaining. When the method of the present invention is used for fixing a rock bolt, preferably, a hole 9
0, or insert the lock bolt 70
0 or self-drilling, and then a fixing solution containing an inorganic fine powder is injected into the hole according to the method described above. When the hollow lock bolt is used, the tube 75
(FIG. 4A). 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. However, 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 is described for fixing a rock bolt. However, the method of the present invention can also be used for other methods such as filling a ground or repairing a crack in a concrete building.

[0032]

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 300 parts, polyol (polypropylene glycol (OH value 500)) 10 parts, curing catalyst (amine type) 0.5
Parts and 90 parts of water were mixed by a ball mill to prepare a wet powder. On the other hand, a hopper and a drug solution inlet are provided at the end,
A monopump (φ50 mm, total length: 30 cm, rotor pitch: 5 cm) having a cylindrical injection rod (inner diameter: 10 mm, length: 3 m) attached to the other end was prepared.
The wet powder is charged into a hopper, and a liquid B containing isocyanate (MDI polyalkylene glycol prepolymer) is supplied from a chemical liquid inlet at a wet powder: liquid B supply ratio of 4: 3.
(Weight ratio). The discharge from the hollow rod is a slurry in which the wet powder and the liquid B are uniformly mixed.
Discharge of 10 liters per minute was 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 causing the injection rod to be blocked. After curing is complete,
When the cured product was cut out and the inside was observed, the PS ash was uniformly dispersed and fixed. The uniaxial compressive strength of the cured polyurethane body is 300 kgf / cm ² , and the specific gravity is
1.2. Curing time is about 3 after mixing wet powder and B liquid.
It takes about 0 minutes. After the discharge was completed, the organic cleaning liquid (hydraulic oil) was passed through the monopump for one minute. Upon disassembly and observation, the residual slurry in the monopump was completely drained. Therefore, it was confirmed that if cleaning was performed after the application, the application method using the monopump was sufficiently practical.

Example 2 A wet powder was prepared in the same manner as in Example 1 except that 300 parts of fly ash was used instead of PS ash, and the supply ratio of the wet powder to the liquid B was 4: 3 (weight ratio). A filling experiment was performed in the same manner 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. The uniaxial compressive strength of the cured polyurethane body is 320 k.
gf / cm ² , specific gravity was 1.3.

Comparative Example 1 A liquid-PS ash mixture was prepared using the same liquid A and PS ash as in Example 1, and the ratio with the liquid B was fixed at 4: 3 (weight ratio). Supplied. Liquid (A
When the weight ratio of PS ash to (liquid + liquid B) was changed and the state of discharge from the static mixer was examined, the weight ratio of PS ash / (liquid + PS ash) was 15%, causing difficulty in discharging, and exceeding 20%. However, even if the supply pressure of the chemical solution was increased, the discharge was intermittent, and stable injection and filling were impossible.

[0036]

According to the construction method of the present invention, the amount of expensive organic chemical solution can be reduced, so that the filling and filling method can be constructed 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 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 a drug solution injection 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 Wet powder hopper, 13
Liquid injection unit, 14 pump means, 15 B liquid reservoir, 1
6, 17 liquid transfer pipe, 20 control unit, 21 switching valve, 2
4 pump means, 25 washing liquid reservoir, 26, 27 liquid transfer pipe, 60 tunnel, 70 lock bolt, 75 hollow part, 80 injection pipe, 90 perforation, 100 ground

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code FI C09K 103: 00 (72) Inventor Kenji Nagatsu 3600 Gezu, Kokutoyama, Komaki-shi, Aichi Tokai Rubber Industries Co., Ltd. (72 ) Inventor: Osamu Wakisaka 3600, Gezu, Kita-gaiyama, Komaki City, Aichi Prefecture Inside Tokai Rubber Industries Co., Ltd. (72) Inventor Keiichiro Yokozawa 3154, Obuchi, Fuji City, Shizuoka Prefecture

Claims (6)

[Claims] 1. A liquid A containing a polyol is added to an inorganic fine powder to form a wet powder, and then the wet powder and a liquid B containing an isocyanate are mixed in a monopump to form a slurry chemical. A method for constructing a ground filling filler, characterized by injecting into a mountain. 2. The method according to claim 1, wherein the inorganic fine powder is added to the slurry in a total amount of 5%.
2. The method according to claim 1, wherein up to 0% by weight is used. 3. The method according to claim 1, wherein the inorganic fine powder is fly ash and / or paper sludge ash. 4. A method for fixing a rock bolt by the method for applying a filler according to claim 1. 5. A monopump 11 having a hopper 12 for charging wet powder and a liquid injection section 13, pump means 14 connected to the liquid injection section 13 via a liquid transfer pipe 17, and a liquid transfer pipe connected to the pump means 14. The control unit 20 controls the pump means 14 to discharge an amount of the B liquid from the B liquid reservoir 15 in accordance with the amount of the wet powder charged. The apparatus used in the method for constructing a ground filling filler according to claim 1, wherein the apparatus is fed into the monopump 11. 6. The apparatus according to claim 5, further comprising a cleaning liquid supply unit.