JPH0757946B2 - Kneading fluid production control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a batcher plant that is pressure-fed to a processing machine.
The present invention relates to a kneading fluid production control device for controlling the production of a kneading fluid such as slurry or mortar to be poured into soil.

[Prior Art] Conventionally, a batcher plant that produces a kneading fluid in which materials such as cement, aggregate or water are kneaded and pumps the kneading fluid to a processor is used for various constructions. . Then, in order to properly inject the kneading fluid that is pressure-fed from the batcher plant to the processor, a speed detector that detects the entry speed of the injection pipe of the processor into the ground is provided. A flow meter for measuring the discharge amount of the kneading fluid pumped by the pump is provided. Calculate the injection amount of the kneading fluid per unit time according to the approach speed detected by this speed detector, and make sure that the calculated injection amount and the actual injection amount detected by the flow meter are the same. It is known that the pump is controlled so that the kneading fluid can permeate into the underground area requiring stabilization without excess or deficiency (Act No. 57-46440).

[Problems to be Solved by the Invention] However, in such a conventional one, the kneading fluid is
It is produced by a batch mixer and pumped to the processor. However, piles are formed in the ground one after another by the processing machine, the soil quality is improved, and while the excavation is being performed by the processing machine, do not empty the agitator that stores the kneading fluid,
A batch mixer produces a kneading fluid, which is successively discharged to an agitator. Therefore, when the excavation is completed, a large amount of excess kneading fluid may remain in the agitator or batch mixer, resulting in a waste of material.

Therefore, the present invention aims to solve the above problems,
An object of the present invention is to provide a kneading fluid production control device that prevents wasteful kneading fluid production.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configurations as means for solving the problems. That is, as illustrated in FIG. 1, the material is weighed and charged into the batch mixer M2 by the material charging device M1 that charges the material according to the set amount to batch-produce the kneading fluid, and from the batch mixer M2 to the agitator M3. Discharge and store, while excavating, a flow meter M5 that measures the flow rate to a processing machine M4 that injects the kneading fluid into the soil through an injection pipe.
Control means M7 for pumping the kneading fluid in the agitator M3 to the processor M4 by a pump M6 while measuring by
In a kneading fluid production control device having, a residual amount detector M8 for detecting the kneading fluid amount of the agitator M3 storing the kneading fluid, and a depth detection for detecting the penetration depth of the injection pipe into the soil. Bowl M9
During excavation, a unit usage amount calculation means M10 for calculating the usage amount of the kneading fluid per unit depth from the flow rate by the flow meter M5 and the penetration depth by the depth detector M9, and the final pile When excavating, based on the usage amount per unit depth, calculate the kneading fluid amount necessary to excavate the remaining depth, kneading fluid excluding the remaining amount by the remaining amount detector M8 This is the configuration of the kneading fluid production control device, characterized by comprising: a changing means M11 for changing the set value of the material feeder M1 according to the amount.

[Operation] In the kneading fluid production control device having the above-described configuration, the material feeding device M1 measures the material, and feeds the material according to the set amount set by the control means M7 to the batch mixer M2. Then, the batch mixer M2 kneads the input materials to batch-produce a kneading fluid, and discharges the kneading fluid to the agitator M3. The pump 6 pressure-feeds the kneading fluid stored in the agitator M3 while the flow rate is measured by the flow meter M5.
The processor M4 injects the kneading fluid into the soil while excavating.

Then, the remaining amount detector M8 detects the amount of kneading fluid remaining in the agitator M3, and the depth detector M9 detects the penetration depth of the injection pipe into the soil. Also, the unit usage calculation means M10
During the excavation, the amount of kneading fluid used per unit depth is calculated from the flow rate detected by the flow meter M5 and the approach depth detected by the depth detector M9.

Further, the changing means M11, when excavating the final pile, based on the usage amount per unit depth, calculates the kneading fluid amount necessary to excavate the remaining depth, by the remaining amount detector M8 The set value of the material feeder M1 is changed according to the amount of the kneading fluid excluding the detected remaining amount. The material according to the changed set value is charged from the material charging device M1 to the batch mixer M2, and the production amount of the kneading fluid is adjusted.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic layout diagram of a kneading fluid production control apparatus according to an embodiment of the present invention. Reference numeral 1 is a cement silo, which is connected so that the stored cement can be put into the measuring tank 2. The measuring tank 2 is provided with a measuring device 4 so that the weight of the cement put into the measuring tank 2 can be measured. Further, the weighing tank 2 is provided with a gate 8 which is opened and closed by driving the cylinder 6, and below the gate 8, a batch mixer 10 is arranged.

Furthermore, it is equipped with a water tank 12 in which water is stored.
When the water pump 14 is operated, the water in the water tank 12 can be supplied to the batch mixer 10 via a water meter 16 that measures the water amount. In this embodiment, the cement silo 1, the measuring tank 2, the water tank 12,
The water pump 14 and the water meter 16 constitute a material feeder M1 that measures cement and water, which are the materials of the kneading fluid, and inputs them into the batch mixer 10.

The batch mixer 10 is a blade that is rotationally driven by a motor 18.
It is equipped with 20 and mixes the input cement, water, etc. to produce a kneading fluid. This batch mixer 10
A gate 24 that can be opened and closed by a cylinder 22 is provided.
Is opened so that the kneading fluid batch-produced for each kneading can be discharged to the agitator 26 provided below the gate 24.

The agitator 26 has blades 30 rotated by a motor 28.
The kneading fluid discharged from the batch mixer 10 is stored while being stirred so as not to separate. In this embodiment, the capacity of the agitator 26 is twice the amount of one batch produced by the batch mixer 10. And agitator 26
A level meter 32 for detecting the level of the kneading fluid stored in the agitator 26 is provided in the. This level total 32
For example, there are those that detect the level of the kneading fluid by utilizing the reflection of ultrasonic waves on the surface of the kneading fluid, and those that detect the level by raising and lowering the float as the level of the kneading fluid rises and falls. Used.

In addition, this agitator 26 includes three suspension metal fittings 34, 36 (2
(Only one is shown)
It is hung so that the weight is evenly applied to 4, 36, and the hanging metal fittings 34, 36 hang the agitator 26 swingably around their respective fulcrums. Then, a remaining amount detector 38 for detecting the weight of the suspended object is attached to one of the hanging metal fittings 36 in a state where the agitator 26 is oscillatably suspended. This remaining amount detector 38, in this embodiment,
A pin type load cell is used.
Is 1/3 of the weight suspended by all suspension metal fittings 34, 36.
Added weight. The detected weight is tripled and the weight of the agitator 26 is subtracted from the value to detect the weight of the kneading fluid in the agitator 26.

The agitator 26 is connected with a pump 40 for feeding the kneading fluid under pressure. In this embodiment, a hydraulic drive type piston pump is used for the pump 40, and the kneading from the pump 40 is performed by a hydraulic drive circuit (not shown). The discharge amount of the fluid per unit time can be adjusted. Further, the discharge side of the pump 40 is connected to the processor 44 via a flow meter 42 that detects the discharge amount of the kneading fluid from the pump 40.

In this embodiment, the flow meter 42 has a configuration in which a blade (not shown) is rotated according to the discharge amount of the kneading fluid that is pressure-fed, and the discharge amount is detected from the relationship between the discharge amount and the rotation speed. And the cement silo 1 and batch mixer described above
10, the water tank 12, the agitator 26, the pump 40, and the water meter 42 are incorporated into a common machine frame (not shown) to form a portable batcher plant 43.

Further, the processor 44 is configured to control the descending speed of the injection pipe 64 by adjusting the feeding speed of the wire 62 while rotating the injection pipe 64 suspended by the wire 62. The rotary drilling blade 46 is attached to the tip of the injection pipe 64, drives the rotary drilling blade 46 to soften the soil, drills the hole 48, and at the same time injects the kneading fluid fed under pressure. It can be injected into the soil from a discharge port (not shown) at the tip of the. Further, a depth detector 66 that outputs a pulse signal as the wire 62 is fed is provided.

The above-mentioned meter 4, water meter 16, remaining amount detector 38, etc. are connected to an electronic control circuit 50 provided in the batcher plant 43, and this electronic control circuit 50 is a well-known CPU 52, ROM 54,
The RAM 56 is configured as the center of a logical operation circuit, and an input / output circuit 58 for performing input / output with an external motor or the like is connected to each other via a common bus 60.

The CPU 52 inputs signals from the meter 4, the water meter 16, the level meter 32, the remaining amount detector 38, and the flow meter 42 via the input / output circuit 58, and based on this signal and the data in the ROM 54 and RAM 56. CP
U52 is connected to the water pump 14, the motor 18, the
A drive signal is output to a control valve or the like (not shown) that drives each of the cylinders 6, 24 and the pump 40 to control each mechanism.

Further, the depth detector 66 is connected to an electronic control circuit 70 mounted on the processor 44. The electronic control circuit 70 has the same configuration as the electronic control circuit 50 described above, and the known CPU 7
2, ROM74, RAM76 is configured as the center of the logical operation circuit, and the input / output circuit 78 for inputting / outputting to / from the common bus 80
And are connected to each other via.

The CPU 72 inputs the signal from the depth detector 66 via the input / output circuit 78, and based on this signal and the data in the ROM 74 and the RAM 76, the CPU 72 outputs the signal from the electronic control circuit 50 via the input / output circuit 78. Various signals are exchanged with the input / output circuit 58 to control each mechanism.

Next, the processing performed in the electronic control circuit 50 of the batcher plant 43 described above will be described with reference to the flowchart shown in FIG.

First, prior to the operation of the batch mixer 10 or the like, the weight Wc of cement added per batch or the addition of water is input by a keyboard provided in the processor 44 (not shown) or an IC card inserted in an IC card reader. The weight Ww and the flow rate of the kneading fluid are input, and RA of the electronic control circuit 70 in the processor 44 is input.
Memorized in M76. Then, the set weights Cc and Ww of cement and water and the flow rates of the kneading fluids that have been set are transmitted from the electronic control circuit 70 by the processing described below, and the electronic control circuit
It is read into 50 (step 100). And the processor 44
It is determined whether or not the start command is transmitted from the electronic control circuit 70 of the above to the electronic control circuit 50 of the batcher plant 43 (step 110).

When the start command is not sent, wait until it is sent, and when it is sent, the water pump 14 is operated and the water tank
The water in 12 is supplied into the batch mixer 10 via the water meter 16. Then, when the supplied water amount is detected by the water meter 16 and the water amount reaches the set input weight Ww,
The operation of the water pump 14 is stopped. In addition, cement is loaded from the cement silo 1 into the weighing tank 2, the weight of the loaded cement is measured by the weighing machine 4, and when the weight reaches a preset loading weight Wc, the loading is stopped.
Then, the cylinder 6 is driven, the gate 8 is opened, and the cement in the measuring tank 2 is put into the batch mixer 10. Thus, when water and cement are added, the motor
Rotate 18 to mix water and cement with the blades 20, and start production of the kneading fluid with the batch mixer 10 (step 120).

Then, after stirring for a certain period of time, the cylinder 22 is driven, the gate 24 is opened, and the kneaded and kneaded fluid is discharged from the batch mixer 10 to the agitator 26 and stored (step 130). In the present embodiment, when the batch production by the batch mixer 10 is performed twice, the agitator 26 becomes full, and when the accumulation is completed, the completion signal is transmitted to the electronic control circuit 70 of the processor 44 (step 140).

Next, a discharge command to be described later is transmitted to the electronic control circuit 70 of the processor 44.
It is judged whether it is transmitted from (step 150),
When there is no transmission, the operation waits, and when there is a transmission, the operation of the pump 40 is started (step 160). Then, the flow rate of the kneading fluid sent from the pump 40 to the processor 44 is measured by the flow meter 42.
And sends the measured flow rate to the electronic control circuit 70 of the processor 44 (step 170). Further, the measured flow rate is compared with a preset flow rate, and the kneading fluid in the agitator 26 is treated with the kneading fluid in the processing machine 44 while adjusting the discharge rate of the pump 40 so that the measured flow rate becomes the set flow rate. (Step 180).

Then, the weight Wa of the kneading fluid remaining in the agitator 26
Is detected by multiplying the value detected by the remaining amount detector 38 by 3, and subtracting the weight of the agitator 26 measured in advance from the value. Then, the weight Wa of this kneading fluid is calculated by the following formula in consideration of the specific gravity of the kneading fluid of cement and water.
(Step 190).

Va = Wa / γ γ = K × (R + 1) / (K × R + 1) Here, K is the true specific gravity of cement, and R is water weight / cement weight.

Then, based on the level detected by the level meter 32, it is determined whether or not the amount of the kneading fluid in the agitator 26 is less than or equal to a predetermined value, that is, less than half of the maximum capacity of the agitator 26 in this embodiment ( Step 200). If it is less than half, the cylinder 22 is driven to open the gate 24, and the agitator 26 is newly discharged from the batch mixer 10 (step
210), the empty batch mixer 10 is charged with water and cement according to the set values, similarly to the process of step 120 described above. Then, the blades 20 knead the mixture to produce a kneading fluid (step 220.) Next, whether or not the pile is the final pile is determined by a signal transmitted from the electronic control circuit 70 of the processor 44 (step 220). 230),
If it is not the final pile, the processes from step 170 onward are repeated again. By repeatedly executing the process, the flow rate of the pump 44 is adjusted while measuring the flow rate discharged from the pump 40, and an appropriate amount of the kneading fluid is pressure-fed to the processor 44. Then, when the kneading fluid in the agitator 26 is consumed up to the specified value or less, the batch mixer 10 discharges the kneading fluid in which water and cement according to the set value are kneaded.

On the other hand, if it is determined that it is the final pile, the new setting value corresponding to the new production amount transmitted from the electronic control circuit 70 of the processor 44 is read in the processing of step 100 by the processing described later. The set value is changed and set (step 240). Then, it is judged whether or not this new production amount is 0 (step 250), and if it is not 0, the processing from step 170 onward is repeatedly executed. This step 220
By performing the treatment of, the batch mixer produces water and cement according to the newly set new production amount.
It is thrown into 10. Further, the kneading fluid produced with this new production amount is discharged to the agitator 26 by the process of step 210 and is pumped to the processor 44 by the pump 40.

Then, as a result of the processing in step 240, the new production amount becomes 0
Is set, and when it is determined to be 0 by the processing of step 250, whether the processing is completed or not is determined by the electronic control circuit of the processor 44.
Judgment based on the signal transmitted from 70 (step 26)
0). When the processing is not completed, the above-mentioned step 170
The following process is repeated, and the kneading fluid is pressure-fed to the processor 44 while measuring the flow rate from the pump 40. Since the new production amount is set to 0, even if the amount of the kneading fluid in the agitator 26 becomes small, in the process of step 220, the batch mixer 10 is not newly supplied with water and cement. That is, only the kneading fluid remaining in the agitator 26 is pressure-fed to the processor 44.

When it is determined that the processing has been completed, the operation of the pump 40 is stopped, and the kneading fluid is not pressure fed to the processing machine 44 (step 27).
0). Then, this control process is once terminated. Incidentally, in the present embodiment, the execution of the processing of steps 100 to 220, 260, 270 is
Acts as control means M7.

Next, the processing performed in the electronic control circuit 70 of the processing machine 44 described above will be described with reference to the flowcharts shown in FIGS.

First, prior to the operation of the processor 44, a set value of materials necessary for producing a kneading fluid such as a cement input weight Wc and a water input weight Ww per batch is input via a keyboard, an IC card or the like not shown. Is stored in the RAM 76 by the electronic control circuit 70 of the processor 44. The electronic control circuit of the processor 44 also sets the necessary values for excavation such as the depth Ls of the pile to be excavated by the processor 44, the stirring diameter D, the flow rate of the kneading fluid, the cement injection ratio α, and the flow rate of the kneading fluid. It is input to 70 and stored in RAM 76 (step 300). Here, the cement input ratio α is the weight of cement to be input per unit volume of the excavated hole 48.

Then, the input set value is transmitted to the electronic control circuit 50 of the batcher plant 43 (step 310), and is read by the electronic control circuit 50 of the batcher plant 43 by the processing of step 100 described above. Then, the production start command signal is sent from the electronic control circuit 70 of the processor 44 to the batcher plant.
It is transmitted to the electronic control circuit 50 of 43 (step 320), and the processing of step 110 causes the batcher plant 43 to start the production of the kneading fluid.

Next, it is determined whether the kneading fluid is stored in the agitator 26,
The step 14 of the electronic control circuit 50 of the batcher plant 43
It is determined by whether or not the accumulation completion signal is transmitted by the processing of 0 (step 330). When the completion signal is not transmitted, it waits until it is transmitted, and when it is transmitted, a kneading fluid discharge command signal is transmitted (step 340). In response to this signal, the batcher plant 43 starts the operation of the pump 40 and pressure-feeds the kneading fluid to the processor 44 by the processing of steps 150 and 160.

Then, the flow rate command signal of the kneading fluid is transmitted, and the rotary drilling blade is
The wire 62 is fed at a preset speed while rotating the 46, and excavation is started (step 360). The batcher plant 43 receives this flow rate command signal and executes the processing of steps 170 and 180 so that the commanded flow rate is achieved.

Then, from the number of pulses per unit time output from the depth detector 66, the feeding speed of the wire 62 is detected, the ascending / descending speed of the injection tube 64 is obtained, and the flow rate detected by the flow meter 42 is The data is transmitted and read by the process of step 170 (step 370). Then, the actual input amount of the kneading fluid per unit volume is calculated from the ascending / descending velocity and the flow rate, and it is determined whether or not the input amount is appropriate (step 38
0). This determination is based on the ascending / descending speed of the injection pipe 64 and the flow rate of the flow meter 62, and the actual cement input ratio per unit volume is obtained. The actual cement input ratio and the preset process of step 300 are performed. The cement input ratio α is compared. If they do not match, step 35
By repeating the processing of 0 or less, the flow rate is changed so as to match them by the processing of step 350, the changed flow rate command signal is transmitted to the batcher plant 43, and the discharge rate of the pump 40 is changed.

If the input amount is appropriate, it is determined whether or not it is the final pile (step 390). Whether or not it is the final pile, in the present embodiment, the operator from the keyboard or the like of the processor 44, when starting the excavation of the final pile, the final pile instruction key is pressed,
An instruction to that effect is given. Alternatively, instead of this, the number of piles may be set in advance, the number of excavated piles may be counted, and the start of excavation of the final pile may be obtained.

If it is not the final pile, it is judged whether or not the excavation process is completed (step 420). If it is not completed, the processes from step 360 onward are repeatedly executed to inject the kneading fluid while excavating, one after another. And form piles. Whether or not the processing is completed is instructed by pressing the end key such as the keyboard of the processor 44.

On the other hand, when it is the final pile, the necessary amount estimation processing is executed (step 400). In this required amount estimation processing, as shown in FIG. 5, first, the required volume Vth of the kneading fluid required to form one pile from the design value is calculated by the following formula (step 500). .

Vth = [(KR + 1) / K] × (π × D 2/4) × L × α Here, L is the pile depth, P is stirred diameter, alpha is input ratio of cement, K is the true specific gravity of cement , R is weight of water / weight of cement per batch.

After the calculation, the calculated capacity Vth is
It is determined whether or not the quantity can be produced within one batch (step 510). If the quantity can be produced within one batch, the processing from step 410 onward is executed.

When the amount cannot be produced within one batch, the unit usage amount of the kneading fluid after the excavation of the final pile is started is detected. In the present embodiment, as shown in FIG. 6, the depth Li detected by the depth detector 66 at that time in the main processing repeatedly executed after the excavation of the final pile is started, and the remaining From the decrease amount Vi of the kneading fluid in the agitator 26 detected by the amount detector 38, the usage amount (= Vi / Li) of the kneading fluid per unit depth is calculated (step 520). In this embodiment, the execution of the process of step 520 works as the unit usage amount calculating means M10.

Then, the pulse signal output from the depth detector 66 is counted to detect the depth Li at that time (step 53).
0), and then the remaining depth is the preset pile depth Ls
Is calculated by subtracting the detected depth Li from (Ls-Li) (step 540). Next, the required amount Vo of the kneading fluid required to excavate the remaining depth is calculated by the following equation (step 550). In this embodiment, step 5
Execution of the processing of 30 to 550, 420, 240 serves as the changing means M11.

Vo = (Ls−Li) × Vi / Li When the required amount Vo is calculated, as shown in FIG. 4, the new production amount V of the kneading fluid, the input weight of water necessary for producing the new production amount V, and The input weight of cement is calculated and transmitted (step 410). The new production amount V is obtained by subtracting the remaining amount of the kneading fluid remaining in the agitator 26 from the required amount Vo (V = Vo-Va). When the new production amount V becomes 0 or a negative value, 0 is set as the new production amount V.
Further, when the new production amount V exceeds the production amount per batch by the batch mixer 10, the water input weight Ww and the cement input weight Wc set by the process of step 300 are set as they are. Then, when the new production amount V is less than the production amount per batch by the batch mixer 10, the addition of new water necessary to produce the kneading fluid having the cement input ratio α by the new production amount V. The weight Ww and the cement input weight Wc are set. The new production amount V is transmitted to the electronic control circuit 50 of the batcher plant 43, and the new production amount V is set by the processing in step 240 described above.

Next, it is judged whether or not the processing is completed (step 42).
0), when the processing is not completed, the processing from step 360 onward is repeatedly executed. When the processing is completed, the operation of the pump 40 is stopped, and the pressure feeding of the kneading fluid to the processor 44 is stopped (step 430). Then, the processor 44 is stopped and the control process is once ended.

That is, the new production amount V is
When the production amount per batch by the batch mixer 10 is exceeded, water and cement having preset values are put into the batch mixer 10. Then, as the excavation depth becomes deeper, the required new production amount V becomes smaller, and the new production amount V becomes less than the production amount per batch by the batch mixer 10. At this time, the remaining excavation is completed with the kneading fluid remaining in the agitator 26 and the kneading fluid in an amount smaller than the amount that can be produced in one batch.

Therefore, when the values are lower, the new water input weight Ww and the cement input weight Wc necessary for producing the calculated new production amount V are set. The kneading fluid of this new production amount V is kneaded up by the batch mixer 10 and the agitator 26
And is pumped to the processor 44 by the pump 40.
Further, in the subsequent calculation, the new production amount V is set to 0. Therefore, when the excavation of the final pile is completed, the kneading fluid in the agitator 26 is pressure-fed to the processor 44, and the kneading fluid does not remain in the agitator 26. Further, even if the new production amount V is set to be slightly larger in consideration of the error, the kneading fluid remaining in the agitator 26 is small when the excavation of the final pile is completed.

In this way, in accordance with the excavation of the final pile, the new production amount V of the kneading fluid finally produced by the batch mixer 10 is calculated in consideration of the excavation depth of the pile, the amount of the kneading fluid used, and the like. And
Since the new production amount V is newly produced, almost no kneading fluid remains in the batch mixer 10 and the agitator 26 when the excavation of the final pile is completed. Therefore, when the excavation of the final pile is completed, a large amount of kneading fluid does not remain, and the waste of material can be prevented.

The present invention is not limited to the embodiments as described above, and may be implemented in various modes without departing from the scope of the present invention. For example, in the present embodiment, the batcher plant 43 and the processor 44 are provided with the electronic control circuits 50 and 70, respectively, but they may be configured to be implemented by one common electronic control circuit.

[Effects of the Invention] As described in detail above, the kneading fluid production control device of the present invention, in accordance with the excavation of the final pile, finally produces the kneading fluid produced by the batch mixer in an amount required thereafter. Since it is produced only, the kneading fluid hardly remains in the batch mixer and the agitator when the excavation of the final pile is completed, and it is possible to prevent the waste of the material.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the basic configuration of the present invention, FIG. 2 is an overall schematic layout diagram of a kneading fluid production control device as one embodiment of the present invention, and FIG. 3 is a batcher plant of the present embodiment. 4 is a flowchart showing an example of batcher plant control processing performed by the electronic control circuit of FIG. 4, FIG. 4 is a flowchart showing an example of processor control processing performed by the electronic control circuit of the processor of the present embodiment, and FIG. FIG. 6 is a flow chart showing an example of the required amount estimation processing performed by the electronic control circuit of the processing machine of the example, and FIG. 6 is a graph showing the relationship between the kneading fluid amount and the excavation depth in this embodiment. M1 …… Material feeder, M2,10 …… Batch mixer, M3,26 …… Agitator M4,44 …… Processor, M5,42 …… Flowmeter M6,40 …… Pump, M7 …… Control means M8,38 …… Remaining amount detector M9 …… Depth detector, M10 …… Unit usage calculation means M11 …… Change means, 1 …… Cement silo 2 …… Measuring tank, 12 …… Water tank 50, 70 …… Electronic control Circuit, 64 ... Injection tube

Claims (1)

[Claims] 1. A material is weighed and charged into a batch mixer by a material charging device that charges the material according to a set amount to batch-produce a kneading fluid, which is discharged from the batch mixer to an agitator for storage and injection while excavating. A kneading fluid having a control means for pumping the kneading fluid in the agitator to the processor by pouring the kneading fluid in the soil into a processor through a pipe while measuring the flow rate by a flow meter for measuring the flow rate. In the production control device, the remaining amount detector that detects the amount of the kneading fluid in the agitator that stores the kneading fluid, the depth detector that detects the penetration depth of the injection pipe into the soil, and A unit usage amount calculating means for calculating the usage amount of the kneading fluid per unit depth from the flow rate by the flow meter and the penetration depth by the depth detector, and before excavating the final pile, Based on the usage amount per unit depth, calculate the kneading fluid amount necessary for excavating the remaining depth, and according to the kneading fluid amount excluding the remaining amount by the remaining amount detector, the material A kneading fluid production control device comprising: a changing unit that changes the set value of the injector.