JP5773488B2 - Aqueous slurry injection apparatus and aqueous slurry injection method - Google Patents

Description

  The present invention relates to aqueous slurry injection technology. In particular, the present invention relates to a technique for injecting an injection material containing a hydraulic inorganic substance such as cement as an active ingredient into the ground, rock or cavity.

  Injection materials are used to stop the ground and rocks, improve soft ground, and fill cavities. As a preferred injection material, for example, a cement-type injection material has been proposed. That is, the cement-based injecting material is generally cheaper than water glass or silica sol, easily obtains high strength, and is excellent in durability. Cement-based injecting materials are generally one-component type water-based slurry injecting cement and the like as active ingredients, and it is easy to ensure and adjust the working time required for work. It is divided into two-part injection materials that can easily obtain high strength. The two-part injection material is composed of two agents, an aqueous slurry containing a rapid-hardening substance and a setting accelerator as an active ingredient, and an aqueous slurry containing a cement such as Portland cement as an active ingredient. Is done.

  By the way, whether it is a one-component type injection material or a two-component type injection material, a continuous mixer is used for the production of this type of aqueous slurry, as shown in Patent Documents 1 to 6, As shown in Patent Document 7, a batch mixer is used. In the on-vehicle plant system and narrow places, a continuous mixer is often used because of its compact size.

  However, the bulk density of the powder in the feeder may differ, and in such a case, when a continuous mixer is used, there is a limit to continuously supplying the material. Furthermore, if there is an aqueous slurry leak or work interruption during the injection of the aqueous slurry, the continuous mixer must also suspend operation. At this time, the quality of the aqueous slurry after the start of operation varies. And it takes time to obtain an aqueous slurry of desired quality.

  On the other hand, since a batch type mixer measures each material for every batch, there is little variation in quality.

  However, since a large amount of aqueous slurry is produced at once, the aqueous slurry is often wasted.

JP-A-9-241638 JP 2000-202266 A JP 2006-342549 A JP 2007-23496 A JP 2007-33165 A JP 2009-96040 A JP 2001-219419 A

  Therefore, the problem to be solved by the present invention is to solve the above problems. In particular, the big problem of the conventional batch mixer, that is, the waste of the aqueous slurry is reduced, and the big problem of the continuous mixer, that is, the variation of the quality of the aqueous slurry at the time of resumption after cancellation is reduced. Furthermore, when injecting an aqueous slurry, the aqueous slurry can be provided efficiently and continuously, and an apparatus capable of providing such an aqueous slurry provides a compact technology.

The problem is
An aqueous slurry injection device for injecting an aqueous slurry containing a hydraulic composition,
The aqueous slurry injection device is:
A hydraulic composition feeder;
N (n is an integer of 2 or more) mixers for kneading the hydraulic composition and water;
A hydraulic composition transport path provided between the feeder and the n mixers;
An aqueous slurry storage tank;
A total of n transportations provided between each of the n mixers and the storage tank for transporting an aqueous slurry containing the hydraulic composition and water kneaded by the mixer to the storage tank. Road,
A pump for discharging and transporting the aqueous slurry in the storage tank to a target location;
The n mixers can be solved by an aqueous slurry injection device characterized in that the kneading capacity is a mixer of 50 liters or less.

  The subject is the aqueous slurry injection device, preferably configured to supply the hydraulic composition from the feeder to an empty mixer that does not hold the hydraulic composition. This is solved by an aqueous slurry injecting apparatus characterized in that an aqueous slurry obtained by kneading a hydraulic composition and water with a mixer is supplied from the mixer to the storage tank.

  The subject is the aqueous slurry injection device, preferably from a mixer to the storage tank so that the aqueous slurry in the storage tank maintains a specified amount even during discharge and transportation of the aqueous slurry by the pump. This is solved by an aqueous slurry injecting device characterized in that the aqueous slurry is supplied in order.

  The subject is the aqueous slurry injection device, preferably configured to stop the supply of the aqueous slurry from the mixer to the storage tank when the aqueous slurry in the storage tank exceeds a specified amount. This is solved by an aqueous slurry injection device characterized in that.

  The subject is the aqueous slurry injection device, preferably, when the aqueous slurry in the storage tank exceeds a specified amount, the hydraulic composition is contained in an empty mixer that does not hold the hydraulic composition. This is solved by an aqueous slurry injection device characterized in that it is configured not to be supplied.

  The subject is the aqueous slurry injection apparatus, preferably, the mixer includes a hydraulic composition meter, and a predetermined amount of the hydraulic composition is contained in the mixer by the hydraulic composition meter. This is solved by an aqueous slurry injection device characterized in that it is configured to be supplied.

  The subject is the aqueous slurry injection device, preferably, the mixer includes a water meter, and the water meter is configured to supply a specified amount of water into the mixer. This is solved by an aqueous slurry injection device characterized in that.

  The subject is the aqueous slurry injection device, preferably comprising an aqueous slurry amount detector for detecting the amount of aqueous slurry in the storage tank, and the aqueous slurry detected by the aqueous slurry amount detector. When the amount of the slurry is larger than the specified amount, the solution is solved by an aqueous slurry injection device configured to stop the supply of the hydraulic composition to the mixer.

  The subject is the aqueous slurry injection device, preferably comprising an aqueous slurry amount detector for detecting the amount of aqueous slurry in the storage tank, and the aqueous slurry detected by the aqueous slurry amount detector. When the amount of slurry is less than the specified amount, the problem is solved by an aqueous slurry injection device characterized in that the hydraulic composition is supplied to the mixer.

The problem is
An aqueous slurry injection method using the aqueous slurry injection device,
A discharge / transport step in which the aqueous slurry in the storage tank is discharged / transported to the target location by a pump,
a hydraulic composition supplying step in which a predetermined amount of the hydraulic composition is supplied to a certain mixer among n (n is an integer of 2 or more) mixers;
A kneading step in which the hydraulic composition supplied in the hydraulic composition supply step and a specified amount of water supplied to the mixer prior to the hydraulic composition supply step are kneaded by the mixer;
This is solved by an aqueous slurry injection method comprising an aqueous slurry supply step in which the aqueous slurry obtained in the kneading step is supplied into a storage tank.

  The subject is the method for injecting an aqueous slurry, and preferably includes an aqueous slurry amount detecting step for detecting an aqueous slurry amount in the storage tank, and the aqueous slurry amount detected by the aqueous slurry amount detecting step. Is more than the prescribed amount, it is solved by an aqueous slurry injection method characterized in that the supply of the hydraulic composition into an empty mixer not holding the hydraulic composition is stopped.

  The subject is the method for injecting an aqueous slurry, and preferably includes an aqueous slurry amount detecting step for detecting an aqueous slurry amount in the storage tank, and the aqueous slurry amount detected by the aqueous slurry amount detecting step. Is less than the prescribed amount, it is solved by an aqueous slurry injection method characterized in that the hydraulic composition is fed into an empty mixer that does not hold the hydraulic composition.

The problem is
A discharge / transport step in which the aqueous slurry in the storage tank is discharged / transported to the target location by a pump,
a hydraulic composition supplying step in which a predetermined amount of the hydraulic composition is supplied to a certain mixer among n (n is an integer of 2 or more) mixers;
A kneading step in which the hydraulic composition supplied in the hydraulic composition supply step and a specified amount of water supplied prior to the hydraulic composition supply step are kneaded by the mixer;
An aqueous slurry supply step in which the aqueous slurry obtained in the kneading step is supplied into a storage tank;
An aqueous slurry amount detecting step for detecting the amount of aqueous slurry in the storage tank,
When the aqueous slurry amount detected by the aqueous slurry amount detection step is larger than a specified amount, the supply of the hydraulic composition into an empty mixer that does not hold the hydraulic composition is stopped, and the aqueous slurry amount detection Solved by an aqueous slurry injection method characterized in that when the amount of aqueous slurry detected by the step is less than a prescribed amount, the hydraulic composition is fed into an empty mixer that does not hold the hydraulic composition. .

  A major problem with conventional batch mixers, that is, waste of aqueous slurry, has been improved, and a major problem with continuous mixers, that is, problems such as variations in quality of aqueous slurry when restarting after stopping Is done.

  In particular, when injecting an aqueous slurry, it is possible to efficiently provide an aqueous slurry of stable quality and provide an aqueous slurry like a continuous mixer.

  Furthermore, an apparatus having the above features can be configured compactly. In particular, the size can be reduced as compared with a conventional batch mixer.

Schematic of the aqueous slurry injection device of the present invention Schematic plan view of the aqueous slurry injection device of the present invention mounted on a vehicle Schematic operation of the aqueous slurry injection apparatus of the present invention Graph of density variation of aqueous slurry produced in the present invention Graph of density variation of aqueous slurry produced in the present invention

  The first invention is an aqueous slurry injection apparatus. This device is in particular a device for injecting an aqueous slurry containing a hydraulic composition. This device is mounted on a car, for example. In this case, it becomes movable. This apparatus comprises a feeder (hydraulic composition feeder). This apparatus includes a mixer (a mixer for kneading the hydraulic composition and water). The number of the mixers is n (n is an integer of 2 or more). Practically, the number is 10 or less. Preferably it is 5 or less. More preferably, it is 3 or less. Two may be sufficient. The reason is that the smaller the number, the smaller the overall size. Even in the case of two, the slurry of the aqueous slurry is quasi-continuous. Each of the mixers has a kneading capacity of 50 liters or less. A mixer of 30 liters or less is preferable. More preferably, the mixer is 20 liters or less. A mixer of 5 to 15 liters may be used. The lower limit would be practically 5 liters. The plurality of mixers may have different kneading capacities, but in reality, equivalent mixers are selected. Even if mixers having different kneading capacities are employed, the amounts kneaded by these mixers are substantially the same. This is because control becomes troublesome when the kneading amount is different. The apparatus includes a first transportation route (a transportation route for a hydraulic composition provided between the feeder and the n mixers). There may be a total of n first transport paths according to the n mixers. That is, one transport path may be provided independently corresponding to one mixer. A part of each transportation route may be shared. Alternatively, if the transport path is configured to be movable, that is, when supplying the hydraulic composition to the mixer, the hydraulic composition outlet of the transport path is positioned corresponding to each mixer, If the hydraulic composition can be supplied into the mixer, only one is required. The apparatus comprises a storage tank (aqueous slurry storage tank). This apparatus includes a second transport path (transport path for transporting an aqueous slurry containing the hydraulic composition and water kneaded by the mixer to the storage tank). The second transport path is provided between each of the n number of mixers and the storage tank. Therefore, the total number of the second transport routes is n. The n transport paths are independent of each other because n mixers are independent of each other. A part of each transportation route may be shared. Accordingly, each of the aqueous slurries produced by the n mixers is directly supplied to the storage tank. The apparatus includes a pump (a pump that discharges and transports the aqueous slurry in the storage tank to a target location).

  The apparatus is configured such that the hydraulic composition is supplied from the feeder to an empty mixer that does not hold the hydraulic composition (a plurality of mixers that are not currently kneaded). Has been. An aqueous slurry obtained by mixer mixing of the supplied hydraulic composition and water is supplied from the mixer to the storage tank. Preferably, even when the aqueous slurry is discharged and transported by the pump, the aqueous slurry is sequentially supplied from the mixer to the storage tank so that the aqueous slurry in the storage tank maintains a specified amount. . Preferably, when the aqueous slurry in the storage tank exceeds a predetermined amount, the supply of the aqueous slurry from the mixer to the storage tank is stopped. Preferably, when the aqueous slurry in the storage tank exceeds a specified amount, the hydraulic composition is not supplied into an empty mixer that does not hold the hydraulic composition. Preferably, a hydraulic composition meter is provided, and a predetermined amount of the hydraulic composition is supplied into the mixer by the hydraulic composition meter. The hydraulic composition meter is provided in the feeder or mixer. Preferably, each mixer is provided. It is preferably provided in the mixer. This is because the amount of the hydraulic composition supplied (introduced) into the mixer becomes more accurate because it is measured immediately before the supply into the mixer. Preferably, a water meter is provided, and a predetermined amount of water is supplied into the mixer by the water meter. The water meter is provided at the water source site or the mixer. Preferably, each mixer is provided. It is preferably provided in the mixer. This is because the amount of water supplied (introduced) into the mixer becomes more accurate because it is measured immediately before the supply into the mixer. Preferably, an aqueous slurry amount detector for detecting the amount of aqueous slurry in the storage tank is provided. When the aqueous slurry amount detected by the aqueous slurry amount detector is larger than a specified amount, the supply of the hydraulic composition to the mixer is stopped. Alternatively, when the aqueous slurry amount detected by the aqueous slurry amount detector is less than a predetermined amount, the hydraulic composition is supplied to the mixer.

  And according to the apparatus of this embodiment, the big problem of the conventional batch type mixer, ie, the waste of aqueous slurry, is improved. And the big problem of a continuous mixer, ie, the problem of the dispersion | variation in the quality of the aqueous slurry at the time of restarting after cancellation, is improved. In particular, when injecting an aqueous slurry, it is possible to efficiently provide an aqueous slurry of stable quality and provide an aqueous slurry like a continuous mixer. Furthermore, an apparatus having the above features can be configured compactly. In particular, the size can be reduced as compared with a conventional batch mixer. In addition, since the mixer and storage tank can be made smaller than when a conventional batch mixer is used, cleaning of the mixer and the like performed after the operation is simplified. Cleaning time is also shortened. Since less washing water is required, waste liquid treatment is easy.

  The second invention is an aqueous slurry injection method. An aqueous slurry injection method using the aqueous slurry injection device. The method includes a discharge / transport step in which the aqueous slurry in the storage tank is discharged / transported to a target location by a pump. The method includes a hydraulic composition supplying step in which a predetermined amount of hydraulic composition is supplied to a certain mixer among n (number (n) is as described above) mixers. In this method, the hydraulic composition supplied in the hydraulic composition supply step and the specified amount of water supplied to the mixer prior to the hydraulic composition supply step are kneaded by the mixer. A kneading step. The method includes an aqueous slurry supply step in which the aqueous slurry obtained in the kneading step is supplied into a storage tank. The method preferably includes an aqueous slurry amount detection step in which the amount of aqueous slurry in the storage tank is detected. When the aqueous slurry amount detected by the aqueous slurry amount detection step is larger than the specified amount, the supply of the hydraulic composition into an empty mixer that does not hold the hydraulic composition is stopped. And / or when the amount of the aqueous slurry detected by the aqueous slurry amount detection step is less than the specified amount, the hydraulic composition is supplied into an empty mixer that does not hold the hydraulic composition.

  The third invention is an aqueous slurry injection method. The method includes a discharge / transport step in which the aqueous slurry in the storage tank is discharged / transported to a target location by a pump. The method includes a hydraulic composition supplying step in which a predetermined amount of hydraulic composition is supplied to a certain mixer among n (number (n) is as described above) mixers. This method comprises a kneading step in which the hydraulic composition supplied in the hydraulic composition supply step and a specified amount of water supplied prior to the hydraulic composition supply step are kneaded by the mixer. It has. The method includes an aqueous slurry supply step in which the aqueous slurry obtained in the kneading step is supplied into a storage tank. The method includes an aqueous slurry amount detection step in which the amount of aqueous slurry in the storage tank is detected. When the aqueous slurry amount detected by the aqueous slurry amount detection step is larger than a specified amount, the supply of the hydraulic composition into the empty mixer not holding the hydraulic composition is stopped, and the aqueous slurry When the amount of aqueous slurry detected by the amount detection step is less than the specified amount, the hydraulic composition is supplied into an empty mixer that does not hold the hydraulic composition.

  This will be described in more detail below.

  The feeder for supplying the hydraulic composition is provided with a first transport path. The first transport path is constituted by, for example, a discharging screw. For example, as many discharging screws as the mixer are provided. An open / close valve is provided at the discharge port end of the discharge screw. When the measurement of the hydraulic composition is started, the on-off valve is opened, the screw rotates, and the cement-based hydraulic composition is supplied to the mixer. When the hydraulic composition is weighed by the desired amount, the screw stops and the on-off valve closes. The operation (rotation) of the screw is controlled by an inverter. Therefore, the supply amount per unit time can be adjusted. When approaching the measured value, the rotation of the screw can be slowed. In this way, errors due to time lag can be reduced. Therefore, the weighing accuracy is increased. What is necessary is just to select suitably the shape, a dimension, etc. of a feeder suitable for usage-amount. It is preferable that the cement-based hydraulic composition can be easily replenished and is made of a rust-resistant material such as stainless steel. The feeder is linked to, for example, a mixer or a storage tank. It is operated according to the pumping amount of the pump, and a specified amount of hydraulic composition is supplied to the mixer.

  There are a plurality of mixers in the present invention. The number of mixers is preferably 2 to 5 as described above. More preferably, it is 2-3. Each mixer is equipped with a measuring device capable of measuring the cement hydraulic composition supplied (discharged) from the supply machine. Each mixer is equipped with a water meter that can meter the blended water per batch. The amount of blended water suitable for blending the aqueous slurry to be mixed is measured. The shape and dimensions of each mixer are not particularly limited. However, the object of the present invention is greatly achieved by the mixer of 50 liters or less as described above. A mixer of 30 liters or less is preferable. More preferably, the mixer is 20 liters or less. A mixer of 5 to 15 liters may be used. If the size is 100 liters or more, for example, 200 liters, as in a conventional batch mixer, the object of the present invention is hardly achieved. In other words, the stirring (kneading) capacity per unit time in each mixer is equal to or less than the pumping amount per unit time of the pump (pumping pump) necessary for construction (aqueous slurry injection operation). In addition, it is in a range where continuous operation is possible and is as small as possible. The shape and dimensions of the stirring blades in each mixer are not particularly limited. A baffle or the like for increasing the stirring efficiency may be appropriately provided on the inner wall of the mixer. The number of rotations of the stirring blade is, for example, 500 to 1500 rotations per minute since stirring in a short time is required. Preferably it is 800-1000 rotations. Each mixer is connected to a feeder and a storage tank. Each mixer is operated according to the pumping amount of the pump.

  The aqueous slurry kneaded and produced by the mixer is supplied (discharged) to the storage tank. At the start of the operation, the aqueous slurry kneaded and produced by each mixer may be supplied (discharged) to the storage tank at a time. Of course, a prescribed amount of the hydraulic composition may be sequentially supplied to each mixer, kneading may be performed in order, and the aqueous slurry may be sequentially supplied (discharged) to the storage tank. However, after the storage tank is filled with the aqueous slurry, the hydraulic composition is sequentially supplied to the mixer, and the kneading is sequentially performed. Then, supply (discharge) of the aqueous slurry to the storage tank is performed sequentially (intermittently). Since the liquid preparation of the aqueous slurry is performed sequentially (intermittently), the waste of the hydraulic composition is reduced. The shape and dimensions of the storage tank are not particularly limited. The capacity of the storage tank is preferably not more than twice the pumping amount per unit time of the pump for pumping necessary for construction (aqueous slurry injection work). In addition, it is in a range where continuous operation is possible and is as small as possible. An aqueous slurry amount detector for detecting the amount of aqueous slurry in the storage tank is provided. The supply of the hydraulic composition is controlled by the output signal of the aqueous slurry amount detector. For example, when the amount of aqueous slurry detected by the aqueous slurry amount detector is larger than a specified amount, the supply of the hydraulic composition to the mixer is stopped. If the amount of aqueous slurry detected by the aqueous slurry amount detector is less than the specified amount, the hydraulic composition is supplied to the mixer. An agitator is attached to the storage tank as needed. The storage tank is interlocked with a feeder and a mixer, is operated according to the pumping amount of the pump, and the aqueous slurry is supplied to the pump.

  The aqueous slurry stored in the storage tank is supplied to a location (injection location) where the aqueous slurry is required by a pump (for example, a pump). The type of the pump (pressure feed pump) is not particularly limited. For example, any structure may be used as long as it has a structure suitable for transportation (pumping) of aqueous slurry. Depending on the amount of pump transportation (pumping), the feeder and mixer are operated in conjunction.

  The aqueous slurry injection device of this embodiment uses an aqueous slurry containing a hydraulic composition (for example, a cement-based hydraulic composition) as an injection material. The aqueous slurry may be a one-component type or a two-component type. It can be applied to any type. The cement-based hydraulic composition is a hydraulic composition containing cement as an active ingredient. In addition to cement, for example, it may contain a component for controlling the setting and curing state, such as a setting accelerator, a setting retarder, and a fast curing agent, and a component for adding other functions such as a thickener and a dispersing agent. . Such a component can be used for mortar and concrete as long as it does not interfere with the pouring property and loses the effect of the present invention. In addition, this kind of agent is supplied to a water meter (or a mixer), for example, and blended as appropriate. The cement used is not limited. Specifically, various portland cements such as normal, early strength, super early strength, low heat, moderate heat, various mixed cements such as blast furnace cement, fly ash cement and silica cement, and special cements such as eco cement are used. I can do it. It may contain a hydraulic substance such as gypsum. It may be a mortar with high fluidity in which fine aggregates such as sand and slag are added to the aqueous slurry.

  Hereinafter, specific examples will be given and described in detail. In the present embodiment, a case where there are two mixers will be described. However, the present invention is not limited to the following description. It is included in the present invention unless it deviates from the technical idea of the present invention described above.

  1 is a schematic view of an aqueous slurry injection apparatus according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the apparatus of FIG. 1 mounted on a vehicle, and FIG. 3 is a schematic operation diagram of the aqueous slurry injection apparatus. . FIG. 1 shows an apparatus used for a two-component type injection material composed of two liquids, liquid A and liquid B. In addition, when the 1 liquid type injection material comprised by 1 liquid is used, only the apparatus of the site | part of A liquid side is used, and the basic technical idea is the same.

  In each figure, 3 is a water tank. 4 is a water supply pump. Reference numerals 11 and 21 denote feeders. Reference numerals 11a and 21a denote material inlets to the feeders 11 and 21, respectively. A11b and B21b are motors. A11c, B11c, A21c, and B21c are screws. A11d, B11d, A21d, and B21d are discharge valves. A11e, B11e, A21e, and B21e are discharge ports. A12, B12, A22, and B22 are water meters. A12a, B12a, A22a, and B22a are supply valves. A12b, B12b, A22b, and B22b are weighing sensors. A12c, B12c, A22c, and B22c are discharge valves. A13, B13, A23, and B23 are mixers. The kneading capacity per unit time of the mixers A13, B13, A23, B23 is, for example, 10 liters. A13a, B13a, A23a, and B23a are measuring instruments. A13b, B13b, A23b, and B23b are motors. A13c, B13c, A23c, and B23c are stirring blades. A13d, B13d, A23d, and B23d are discharge valves. 14 and 24 are storage tanks. The maximum volume of the storage tanks 14 and 24 is, for example, 30 liters. Reference numerals 14a and 24a denote detection sensors. Reference numerals 14b and 24b denote motors. 14c and 24c are stirring blades. 15 and 25 are pressure feed pumps. Reference numerals 16 and 26 denote flow meters. 17 and 27 are pressure gauges.

  As will be understood from the above description, a symbol starting with a numeral 1 indicates a device of each part on the A liquid side, and a symbol starting with a numeral 2 indicates a device of each part on the B liquid side. A attached to the front of the number corresponds to the first mixer, and B attached to the front of the number corresponds to the second mixer. The apparatus on the A liquid side and the apparatus on the B liquid side are basically the same except for the processing object. Therefore, the operation of the device on the A liquid side will be described below. Since the same applies to the B liquid side, the operation of the B liquid side apparatus can be easily inferred from the following description.

  The feeder 11 is a cement-based hydraulic composition feeder. The feeder 11 includes a plurality of discharging screws A11c and B11c. The discharging screws A11c and B11c are driven by motors A11b and B11b (B11b not shown), respectively. Note that the motor A11b and the motor B11b basically do not operate simultaneously. Driven separately at different times. In conjunction with this drive, the discharge valves A11d and B11d operate. The cement-based hydraulic composition is replenished (supplied) from the inlet 11a. Even during the operation of the discharging screws A11c and B11c, the cement-based hydraulic composition can be replenished (supplied) from the charging port 11a.

  A specified amount of water (mixed water) measured by the water meters A12 and B12 is supplied to the mixers A13 and B13. Although it has been explained that the cement-based hydraulic composition is basically not supplied (input) simultaneously to the mixer A13 and the mixer B13, water (mixed water) is supplied (input) simultaneously to the mixer A13 and the mixer B13. May be. Of course, it may be supplied (input) in order as in the case of the cement-based hydraulic composition. However, after water (blended water) is supplied (input) to the mixers A13 and B13, the cement-based hydraulic composition is supplied (input) to the mixers A13 and B13.

  After a prescribed amount of water (mixed water) is supplied to the mixers A13 and B13, the cement-based hydraulic composition is supplied to the mixers A13 and B13. That is, the cement-based hydraulic composition discharged from the feeder 11 is measured by the measuring devices A13a and B13a. The scales A13a and B13a are interlocked with the motors A11b and B11b (B11b is not shown) of the discharge screws A11c and B11c and the discharge valves A11d and B11d. For example, when it is detected by the measuring instruments A13a and B13a that the supply amount (input amount) of the cement-based hydraulic composition into the mixers A13 and B13 has reached a specified amount, the motors A11b and B11b are stopped. The discharge valves A11d and B11d are closed. Therefore, supply (injection) of the cement-based hydraulic composition exceeding the specified amount does not occur.

  When the supply (injection) of the prescribed amount of the cement-based hydraulic composition into the mixer is started, the driving of the motors A13b and B13b is started. Thereby, stirring (kneading) by the stirring blades A13c and B13c is started. After stirring (kneading) for a predetermined time, the discharge valves A13d and B13d are opened. Thereby, the kneaded material (aqueous slurry) of the cement-based hydraulic composition and water is discharged. Then, the aqueous slurry is supplied (input: stored) to the storage tank 14.

  The apparatus of the present invention comprises a plurality of mixers. In this embodiment, there are two mixers. As described above, the cement-based hydraulic composition is not supplied (introduced) to the mixer A13 and the mixer B13 at the same time except for a special case (at the start). Of course, in any case, the cement-based hydraulic composition may be supplied (input) to the mixer A13 and the mixer B13 alternately. For example, while the mixer A13 is stirring (kneading), preparation for the stirring (kneading) work by the mixer B13 (standby for stirring (kneading) work) is performed. While the mixer B13 is stirring (kneading), preparation for the stirring (kneading) work by the mixer A13 (waiting for the stirring (kneading) work) is performed. That is, when the specified amount of water charged into one mixer and the specified amount of cementitious hydraulic composition are kneaded, only the specified amount of water is charged into the other mixer. That is, at this time, the cement-based hydraulic composition has not been charged into the other mixer.

  When the stirring (kneading) operation by the mixer A13 is finished, the cement-based hydraulic composition-containing aqueous slurry is discharged (injected) into the storage tank. After discharge (injection), the amount of aqueous slurry in the storage tank 14 is detected by a detection sensor 14 a provided in the storage tank 14. When this detected amount is less than the threshold value, a prescribed amount of cementitious hydraulic composition is discharged (injected) into the mixer B13 in a standby state (prepared state) in which only a prescribed amount of water has been introduced. Then, a stirring (kneading) operation is performed. After completion of the stirring (kneading) operation, the cement-based hydraulic composition-containing aqueous slurry is discharged (injected) into the storage tank 14. When the detected amount is larger than the threshold value, the cement-based hydraulic composition is not discharged (injected) into the mixer B13 and remains in a standby state.

  The aqueous slurry in the storage tank 14 is discharged and transported to a target location (aqueous slurry injection location) by a pressure pump 15. The amount of aqueous slurry in the storage tank 14 is reduced by the operation of the pressure pump 15. When the detected amount of the aqueous slurry in the storage tank 14 is less than the threshold value, the specified amount of the cement-based hydraulic composition is discharged (injected) into the standby mixer, and the stirring (kneading) work is performed. The aqueous slurry is discharged (injected) into the storage tank 14. Thereby, although it is intermittent, a predetermined amount of aqueous slurry is stored in the storage tank 14. Therefore, the aqueous slurry can be continuously injected into the injection point by the pressure pump 15. During the injection, the injection amount and the injection pressure are managed by the flow meter 16 and the pressure gauge 17. A motor, a discharge valve, a water meter, a metering sensor, a detection sensor, and the like are centrally controlled by a control panel.

Hereinafter, an example of producing a cement slurry using the liquid A side mixer will be described.
The feeder (W760mm L2210mm H1700mm volume 0.65 m ³⁾ 11, ultrafine particles cement (Arofikusu manufactured MC Pacific Ocean material) was supplemented. Water was supplied from the water tank (capacity: 2 m ³ ) 3 to the water meter A12 with the submersible pump 4, and 8 L of water was measured. This 8 L of water was supplied to a mixer (φ260 mm H400 mm stirring capacity 10 L) A13. Immediately thereafter, the motor A13b of the mixer A13 was driven, and the stirring blade A13c started to rotate (900 rpm). Next, the motor A11b was driven, the screw A11c started to rotate (payout amount 25 kg / min), and cement began to be put into the mixer A13. The amount of cement was weighed by a meter (load cell) A13a attached to the mixer. When 6 kg of cement was weighed, the discharge valve A11d was closed. Thereby, the cement input to the mixer A13 was stopped. The measuring time from the start of cement supply to the stop was 15 seconds. After weighing, stirring (kneading) was further continued for 5 seconds. The aqueous slurry (cement slurry) obtained by this stirring (kneading) was supplied (discharged) into the storage tank (φ400 mm H250 mm capacity 30 L) 14 with the discharge valve A13d opened. After the discharge, the discharge valve A13d was closed, and 8 L of water previously measured by the water meter A12 was supplied to the mixer A13. Note that immediately after 8 L of water is supplied to the mixer A13, the next batch is weighed.

  The aqueous slurry (cement slurry) supplied (discharged) into the storage tank 14 is stirred by the stirring blade 14c. The amount of aqueous slurry (cement slurry) in the storage tank 14 is detected by an electrode-type detection sensor 14 a provided in the storage tank 14. That is, the amount of aqueous slurry (cement slurry) is between the lowest liquid level (LL: aqueous slurry amount 5 L at the lowest liquid level in this example) and the highest liquid level (HL: aqueous slurry amount 22 L at the highest liquid level in this example). It is detected whether or not When the amount of aqueous slurry is below the maximum liquid level, 8 L of water and 6 kg of cement are continuously added to the mixer B13 in the same manner as in the case of the mixer A13, and after stirring (kneading), the kneading is performed. An aqueous slurry is supplied (discharged) into the storage tank 14. When the amount of the aqueous slurry exceeds the maximum liquid level, cement is not charged into the mixer B13, and the mixer B13 remains stopped.

  The storage tank 14 and the pressure pump 15 are connected by a suction hose, and an injection hose (a flow meter 16 and a pressure gauge 17 in the middle) is connected from the pressure pump 15 to the discharge port (injection port). And the aqueous | water-based slurry (cement slurry) in the storage tank 14 is supplied (discharged) from the discharge port (injection port). At the time of delivery (discharge), flow control by the flow meter 16 and pressure control by the pressure gauge 17 are performed. Since the aqueous slurry (cement slurry) in the storage tank 14 is consumed by the injection of the aqueous slurry into the injection site, the liquid level in the storage tank 14 is lowered. When the liquid level becomes equal to or lower than HL, cement measurement is started to the mixer in the standby state of either the mixer A13 or the mixer B13 based on the detection signal. After the cement is measured and kneaded (stirred), an aqueous slurry (cement slurry) is supplied (discharged) into the storage tank 14 from the mixer.

  In the unlikely event that the liquid level in the storage tank 14 falls below the minimum liquid level (LL), the operation of the pressure feed pump 15 is automatically stopped.

  Description of the above steps, that is, operation status of mixer A13 (mixer 1) and mixer B13 (mixer 2) (water supply / metering, cement supply / metering, kneading (stirring) of water and cement, kneading (stirring)) The state of discharge of the later aqueous slurry (cement slurry) into the storage tank 14), the operation state of the storage tank 14 (state of the liquid level in the storage tank 14), and the operation state of the pressure pump 15 are shown in FIG. Indicated. According to this, when one mixer is in operation, the other mixer is in a standby state (where standby means that the hydraulic composition is not charged (supplied) into the mixer. Water is a mixer) In this case, the kneading by the two mixers is alternately performed by repeating the operation and the standby in order, and the aqueous slurry (cement slurry) storage tank 14 is semi-continuously. To the inside. Therefore, it is difficult to cause an accident that the aqueous slurry (cement slurry) is basically lost from the storage tank 14 during the operation of injecting the aqueous slurry (cement slurry). In addition, the volumes of the mixers A13 and B13 are smaller than those of the conventional batch mixer, and even if they are added together, the volume is small, and therefore the amount of wasted cement is inevitably reduced. However, since each mixer is basically a batch mixer, there is no problem of variations in the quality of the aqueous slurry when the mixer is stopped or restarted. In addition, when the aqueous slurry is injected, the aqueous slurry can be provided efficiently and continuously. Moreover, the device that can provide the aqueous slurry is compact.

The quality of the aqueous slurry (cement slurry) obtained as described above was examined, and the results are shown in FIGS. FIG. 4 is a graph showing how the density of the aqueous slurry (cement slurry) produced by the mixer A13 (mixer 1) or the mixer B13 (mixer 2) varies. The calculated density value is 1.4 g / cm ³ , whereas the measured density value is 1.397 to 1.411 g / cm ³ , and the quality (density) of the aqueous slurry (cement slurry) is stable. You can see that FIG. 5 is a graph showing how the density fluctuates when the pressure pump is in operation and when the operation starts after stopping. It can be seen that the quality (density) of the aqueous slurry (cement slurry) is stable even when the pump is temporarily stopped.

  The above description was for a one-pack type injection material. In the case of the two-component type, the device on the B liquid side is used in the same manner. During injection, the A liquid in the storage tank 14 and the B liquid in the storage tank 24 are pumped and delivered by pumps 15 and 25, respectively. (Drained) and mixed in the middle, and then injected. And since the basic technical idea is the same, detailed description is abbreviate | omitted.

3 Water tank 4 Water supply pump 11, 21 Supply machine A11c, B11c, A21c, B21c Screw A11d, B11d, A21d, B21d Discharge valve A11e, B11e, A21e, B21e Discharge port A12, B12, A22, B22 Water meter A12b, B12b, A22b, B22b Metering sensors A12c, B12c, A22c, B22c Discharge valves A13, B13, A23, B23 Mixers A13a, B13a, A23a, B23a Meters A13c, B13c, A23c, B23c Stirring blades A13d, B13d, A23d, B23d Valves 14, 24 Storage tanks 14a, 24a Detection sensors 15, 25 Pressure feed pump

Claims (13)

An aqueous slurry injection device for injecting an aqueous slurry containing a hydraulic composition,
The aqueous slurry injection device is:
A hydraulic composition feeder;
First and second mixers for kneading the hydraulic composition and water;
A hydraulic composition transport path provided between the feeder and the mixer;
An aqueous slurry storage tank;
A transport path provided between each of the mixers and the storage tank for transporting an aqueous slurry containing the hydraulic composition and water kneaded by the mixer to the storage tank;
A pump for discharging and transporting the aqueous slurry in the storage tank to a target location;
The mixer, the kneading volume, both, Ri mixer der below 50 liters,
The aqueous slurry injection device is:
In the case where the amount of aqueous slurry in the storage tank is less than a specified amount at a stage after the initial start of the aqueous slurry injection device, when the feeder supplies a hydraulic composition to the mixer, Control means for not supplying the composition to all the mixers simultaneously and not supplying the hydraulic composition to at least one mixer
Aqueous slurry injection device according to claim <br/> be provided with a. The hydraulic composition is configured to be supplied from the feeder to an empty mixer that does not hold the hydraulic composition, and the aqueous slurry obtained by mixer mixing of the supplied hydraulic composition and water is removed from the mixer. The aqueous slurry injecting apparatus according to claim 1, wherein the apparatus is configured to be supplied to a storage tank. The aqueous slurry is configured to be sequentially supplied from the mixer to the storage tank so that the aqueous slurry in the storage tank maintains a specified amount even during discharge and transportation of the aqueous slurry by the pump. The aqueous slurry injection device according to claim 1 or 2. The aqueous slurry according to any one of claims 1 to 3, wherein when the aqueous slurry in the storage tank exceeds a specified amount, the supply of the aqueous slurry from the mixer to the storage tank is stopped. Injection device. When the aqueous slurry in the storage tank exceeds a specified amount, the hydraulic composition is configured not to be fed into an empty mixer that does not hold the hydraulic composition. Item 4. The aqueous slurry injection device according to any one of Items 4 to 4. The mixer comprises a hydraulic composition meter,
6. The aqueous slurry injection device according to claim 1, wherein a predetermined amount of the hydraulic composition is supplied into the mixer by the hydraulic composition meter. The mixer comprises a water meter,
The aqueous slurry injection device according to any one of claims 1 to 6, wherein a predetermined amount of water is supplied into the mixer by the water meter. Comprising an aqueous slurry amount detector for detecting the amount of aqueous slurry in the storage tank;
The hydraulic composition is configured to be stopped when the amount of aqueous slurry detected by the aqueous slurry amount detector is larger than a predetermined amount. Any aqueous slurry injector. Comprising an aqueous slurry amount detector for detecting the amount of aqueous slurry in the storage tank;
The hydraulic composition is configured to be supplied to the mixer when the aqueous slurry amount detected by the aqueous slurry amount detector is less than a predetermined amount. Aqueous slurry injector. An aqueous slurry injection method in which the aqueous slurry injection device according to any one of claims 1 to 9 is used,
A discharge / transport step in which the aqueous slurry in the storage tank is discharged / transported to the target location by a pump,
A hydraulic composition supplying step in which a specified amount of hydraulic composition is supplied to a mixer in the mixer;
A kneading step in which the hydraulic composition supplied in the hydraulic composition supply step and a specified amount of water supplied to the mixer prior to the hydraulic composition supply step are kneaded by the mixer;
An aqueous slurry supply step in which the aqueous slurry obtained in the kneading step is supplied into a storage tank,
When the hydraulic composition is supplied to the mixer when the amount of aqueous slurry in the storage tank is less than the specified amount after the initial start of the hydraulic composition supply step, the hydraulic composition is An aqueous slurry injection method , wherein all the mixers are not supplied at the same time, and the hydraulic composition is controlled not to be supplied to at least one mixer . An aqueous slurry amount detection step for detecting the amount of aqueous slurry in the storage tank;
When the aqueous slurry amount detected by the aqueous slurry amount detection step is larger than a specified amount, the supply of the hydraulic composition into an empty mixer not holding the hydraulic composition is stopped. The method for injecting an aqueous slurry according to claim 10. An aqueous slurry amount detection step for detecting the amount of aqueous slurry in the storage tank;
The hydraulic composition is supplied into an empty mixer that does not have a hydraulic composition when the aqueous slurry amount detected by the aqueous slurry amount detection step is smaller than a specified amount. An aqueous slurry injection method. A discharge / transport step in which the aqueous slurry in the storage tank is discharged / transported to the target location by a pump,
A plurality pieces of hydraulic composition supply step of defining the amount of the hydraulic composition to a certain mixer is supplied in the mixer,
A kneading step in which the hydraulic composition supplied in the hydraulic composition supply step and a specified amount of water supplied prior to the hydraulic composition supply step are kneaded by the mixer;
An aqueous slurry supply step in which the aqueous slurry obtained in the kneading step is supplied into a storage tank;
An aqueous slurry amount detecting step for detecting the amount of aqueous slurry in the storage tank,
When aqueous slurry amount detected by said aqueous slurry amount detecting step is larger than the specified quantity, it is not supplied in the hydraulic composition to an empty the mixer does not possess hydraulic composition, the hydraulic composition If the amount of aqueous slurry detected by the aqueous slurry amount detection step at a stage after the initial start of the supply step is less than a specified amount, the hydraulic composition is not supplied to all the mixers at the same time, and at least one An aqueous slurry injection method, wherein the hydraulic composition is supplied into an empty mixer which is controlled so that the hydraulic composition is not supplied to the mixer and does not hold the hydraulic composition.

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