JPH03100222A - Control of pouring-in of grout and pouring controller and pouring control circuit - Google Patents

Abstract

PURPOSE:To prevent the clogging of a pipe by detecting concentration of grout from each detected flow rate in a water flow rate detector and an original liquid flow rate detector and the constants such as the previously set specific gravity and compounding ratio of original liquid and adjusting an original liquid adjusting valve so that a designated concentration is obtained. CONSTITUTION:When a pump 7 for original liquid is operated, the original liquid in an original liquid storage tank 5 is sent into an original liquid adjusting valve 8. Then, a pump 3 for water is operated, and the opening degree of a water adjusting valve 4 is properly adjusted, and the water in a water storage tank 1 is allowed to flow into a convergence flow pipe 13, and the flow rate of the water is detected by a water flow rate detector 11. Then, the opening degree of the original liquid adjusting valve 8 is properly adjusted. Then, the original liquid flows in the convergence flow pipe 13 and converges with water, and the flow rate of the original liquid is detected by an original liquid flow rate detector 12. Further, the convergence flow liquid is mixed in a mixer 14, and formed into grout, and the pouring pressure is detected by a pressure detector 15, and the grout is poured into the ground 18 through a pouring-in pipe 16 and a pouring pipe 17 on the ground side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grout injection control method, an injection control device, and an injection control circuit used for ground reinforcement, water stoppage, etc. in dam and tunnel construction.

[Prior art] As a conventional technique for grout injection, Japanese Patent Application Laid-open No. 59-9892
Publication No. 2 discloses a technology for controlling flow rate and pressure using an automatic three-way flow rate adjustment valve, and is published in Japanese Patent Application Laid-Open No. 59-218.
15 and Japanese Unexamined Patent Publication No. 59-21816 disclose techniques for controlling concentration. Also, JP-A-59-98
No. 924 discloses a technique that uses a concentration detector as a means for determining concentration.

When these known techniques are combined, the flow rate, pressure, and concentration of grout can be controlled, but there are the following problems.

(t): A degree control is performed on the suction side of the infusion pump, and flow rate and pressure control is performed on the discharge side of the infusion pump, so the device is divided into two blocks, making relocation troublesome and time-consuming, and reducing work efficiency. bad.

(2) Concentration control is difficult to stabilize due to differences and changes in the water level of the stock solution storage tank and the water head of the added water.

(3) There is a problem with the resolution of the concentration detector, making concentration control unstable.

(4) The concentration detector is expensive, making the device expensive.

Due to the above reasons, it has been difficult to put it into practical use.

Furthermore, Japanese Patent Application Laid-Open No. 57-108309 discloses that the hydraulic pressure and oil amount supplied to the pump are controlled based on the detected values of the flow rate and pressure detector, and the flow rate and pressure of the grout are indirectly controlled by this control. A flow pressure and concentration control technique is disclosed in which the concentration is controlled by continuously supplying water and cement to a mixer connected to the other end of the suction line. However, the above technology had the following problems.

(1) Hydraulic drive injection pump, hydraulic unit, Miki length,
Equipment such as a cement quantitative supply device and a cement reeling device is required, which makes the device large and difficult to use on site, including relocation.

(2) The equipment becomes expensive, and if a large number of equipment is required, the equipment cost is too high.

(3) If the pressure increases and the injection flow rate decreases at the end of injection, there is a high possibility that cement will precipitate in the pipeline and cause blockage, leading to interruptions in construction and increased costs for restoration.

(4) Due to the volume of the pipe line between the mixer motherboard and the injection pipe, it is not possible to quickly follow the concentration switching instruction.

For the reasons described above, the above technology has not yet become widespread.

Also, JP-A-61-22410 and JP-A-61-2
Publication No. 2411 discloses that water is added to the stock solution that has passed through the injection side port of an automatic 3-hour flow rate adjustment valve that controls the flow rate and pressure via the water flow rate adjustment valve, and the water flow rate adjustment valve is controlled based on the detected value of the concentration detector. Techniques are disclosed for controlling concentration. However, the above technology had the following problems.

(1) When grout is injected at a low temperature, the injection flow rate is human, but the undiluted solution is a small flow rate. It is difficult to control the flow rate smoothly and the concentration of the grout is unstable.

(2) When low-concentration grout is required at the initial stage of injection, the concentration in the section from the confluence pipe to the concentration detector is not detected, so the automatic 3-way flow rate adjustment valve is activated by the signal from the flow rate pressure detector. If this occurs, the stock solution will flow into the injection tube, which is undesirable.

(3) Due to the resolution limit of the concentration detector, it is difficult to distinguish between water cement specific gravity and 8, and between 8 and 10, and the flow rate control of water added to adjust the concentration is unstable, making the grout concentration unstable.

(4) The concentration detector is expensive and the cost of the device becomes too high.

For the reasons described above, the above technology has not yet been put into practical use.

[Problems to be Solved by the Invention] The purpose of the present invention is to provide a grout injection control method, an injection control device, and an injection control circuit that satisfy the following matters in order to solve the problems of the prior art described above. .

(1) Pipe blockage is unlikely to occur due to cement precipitation due to a decrease in flow velocity within the vessel.

(2) The device can be used near the injection port to prevent blockage in the injection tube.

(3) In order to effectively fill joints in the rock during grouting work, even a small amount of undiluted solution should not directly flow into the grout.
The density of grout gradually increases from water to density.

(4) It is possible to accurately determine the low concentration water-cement ratio of 6.8.10.

(5) The grout concentration is stable and can quickly follow concentration instructions.

(6) The device must be small and lightweight and can be provided at low cost.

[Means for Solving the Problems 1] In order to achieve the above object, the grout injection control method of the present invention sends water from a water storage tank to a confluence pipe via a paddy pump water regulating valve and a water flow rate detector, and The undiluted solution in the undiluted solution storage tank,
The liquid is sent to the merging pipe via the undiluted liquid pump, the undiluted liquid regulating valve, the undiluted liquid flow rate detector, and the water is combined with the water V, the detected pressure of the pressure detector installed in the merging pipe or the injection pipe following it, and the water flow rate detector and the undiluted liquid. Adjust the water adjustment valve so that the sum of the flow rates detected by the flow rate detectors or the flow rate detected by the combined flow rate detector installed in the confluence pipe or injection pipe does not exceed the preset maximum pressure and maximum flow rate, and adjust the water flow rate. It is characterized by a combined liquid, that is, grout, based on the flow rate detected by the detector, the flow rate detected by the stock solution flow rate detector, and constants such as the specific gravity and blending ratio of raw materials set in advance.

The grout injection control device of the present invention also includes a water adjustment valve and a water flow rate detector that adjust the amount of water sent from the water supply pipe to the merging pipe, and a water flow rate detector that adjusts the amount of stock solution sent from the undiluted solution supply pipe to the merging pipe. The pressure of the grout formed by merging in the merging pipe, or the pressure of the water and/or undiluted solution before merging. It is characterized by being equipped with a pressure detector that detects.

Further, the grout injection control circuit of the present invention includes a flow rate pressure calculation circuit that sets the limits of flow rate and pressure when injecting grout into the ground, that is, the maximum flow rate and maximum pressure, and the above-mentioned pressure detector and water flow rate detector. , a flow rate pressure comparison circuit that inputs the detected values of the raw solution flow rate detector and/or the combined flow rate detector and compares the wave peaks, and a water adjustment valve drive circuit that operates the water adjustment valve based on the result of the flow rate pressure comparison circuit, and The concentrated liquid concentration, cement specific gravity, ben-1-henite specific gravity, and relative to cement are necessary to calculate the concentration of the combined liquid based on the detected amounts of the water flow rate detector, raw liquid flow rate detector, and/or combined flow rate detector. A constant calculation circuit that presets constants such as the mixing ratio of bentonite, a flow rate detected by a water flow rate detector, a raw solution flow rate detector, and/or a combined flow rate detector, and a set value of the constant calculation circuit are used to calculate the combined liquid, that is, grout. Do you want to show the concentration of '? An f2 degree circuit, a temperature calculation circuit that predetermines the grout concentration a2, or a concentration indicating circuit that can automatically indicate the grout concentration from the concentration switching conditions and the detected values of the injection flow rate and injection pressure, and the wavy line. The present invention is characterized by comprising a concentration comparison circuit that compares the concentration determined in step 1 with a set or instructed concentration, and a concentration comparison circuit that drives the concentration adjustment valve based on the result of the concentration comparison circuit.

[Function] In the grout injection control method of the present invention, the water supplied from the water supply pipe and the stock solution supplied from the stock solution supply pipe are combined in a confluence pipe to form grout, and the grout is injected into the ground from the injection pipe. In addition to adjusting the water flow rate with a water adjustment valve so that the pressure and flow rate do not exceed the preset maximum pressure and maximum flow rate, the detected flow rate of water and stock solution, and the preset specific gravity and blending ratio of raw materials, etc. The concentration of the grout is known from the constant, and the grout is injected by adjusting the stock solution adjustment valve to reach the specified concentration. The grout concentration can be adjusted steplessly and quickly, and the ao can be injected with stability.

The grout injection control device of the present invention includes a water regulating valve and a water flow rate detector, a stock solution regulation valve and a stock solution flow rate detector, and/or a combined flow rate detector, and detects the pressure of grout or the pressure of water and/or stock solution. Since the grout injection control method is equipped with a pressure detector, the grout injection control method described above can be carried out without any problem.

Further, the grout injection control circuit of the present invention includes a flow pressure calculation circuit, a flow pressure comparison circuit, a water adjustment valve drive circuit, a constant calculation circuit, a concentration indication circuit, a temperature calculation circuit, a g degree indication circuit,
Although the apparatus is equipped with a concentration comparison circuit and a stock solution adjustment valve driving circuit, by adding a detection injection control circuit to the above-mentioned apparatus, the injection control method can be performed automatically and accurately.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a grout injection system diagram, in which 1 is a water storage tank, 2 is a water supply pipe connected to the water storage tank 1, and 3 is a water supply pipe connected to the water storage tank 1.
is a water pump attached to the water supply pipe 2, 4 is a water adjustment valve attached to the tip of the water supply pipe 2, 5 is a stock solution storage tank equipped with an agitator, and 6 is connected to the stock solution storage tank. 7 is a pump for stock solution attached to the stock solution supply pipe 6, 8 is a stock solution regulating valve attached to the tip of the stock solution supply pipe 6, and 9 is a pump for stock solution adjusted by the stock solution regulating valve 8. When the flow rate is low, the flow rate of the stock solution supply pipe 6 decreases and cement particles precipitate, and the flow rate flowing through the stock solution supply pipe 6 is made sufficiently large so that the stock solution supply pipe 6 does not become clogged, and excess stock solution is always sent to the stock solution storage tank 5. It is a return pipe configured to return.

10 is the confluence point of the water in the water supply pipe 2 and the undiluted solution in the undiluted solution supply pipe 6;
11 is a water flow rate detector attached to the water supply pipe between the water regulating valve 4 and the confluence point 1o, and 12 is the raw solution regulating valve 8 and the confluence point 1o.
a stock solution flow rate detector attached to the stock solution supply pipe between 13;
1 is a confluence pipe where the adjusted water and the stock solution are combined; 14 is a mixer provided at the end of the confluence pipe 13; and 1 is a mixer for mixing the water and the stock solution;
5 is a pressure detector attached to an injection pipe 16 connected to the other end of the mixer 14, and 17 is a ground-side injection pipe that is bored and buried in the ground 18.

In the device shown in the system diagram above, when the water storage tank 1 is filled with water and the water pump 3 is operated, if the water regulating valve 4 is closed, the water supply pipe between the water pump 3 and the water regulating valve 4 is The water in 2 is kept at a constant pressure.

Further, when a stock solution is produced in a mixer (not shown), introduced into the stock solution storage tank 5, and stirred by a stirrer while operating the stock solution pump 7, the stock solution in the stock solution storage tank 5 is adjusted to the stock solution. If the initial state of the stock solution adjustment valve 8 is set so that the entire amount flows to the return pipe 9, the stock solution will flow through the stock solution storage tank 5, the stock solution supply pipe 7, the stock solution adjustment valve 8, and the return pipe 9. It will be a cycle.

When the water regulating valve 4 is set to an appropriate level and water is allowed to flow into the merging pipe 13, the water flow rate detector 11 detects the flow rate of the water. Next, when the opening degree of the stock solution flow rate detector side of the stock solution adjustment valve 8 is adjusted appropriately, the stock solution flows into the merging pipe 13 and merges with the water.
Moreover, the flow rate of the stock solution is detected by the stock solution flow rate detector.

The confluent liquid that has joined in the confluence pipe 13 is further mixed in the mixer 14 to become grout, the injection pressure is detected by the pressure detector 15, and the confluent liquid passes through the injection pipe 16 and the ground side injection pipe 17 to the ground 18.
injected into.

To explain the actual injection state in more detail, it is known that the transition of injection pressure and flow rate is divided into immediately after the start, early injection period, and late injection period, and follows the following process.

(1) Immediately after starting, the pressure and flow rate do not reach the maximum pressure and maximum flow rate.

(2) In the first half of injection, although the flow rate has reached the maximum flow rate, the pressure has not reached the maximum pressure and is still rising (constant flow rate control).

(3) In the latter half of injection, the pressure reaches the maximum pressure and the flow rate is gradually reduced to maintain the maximum pressure (constant pressure control).

Immediately after the above-mentioned start, the opening degree of the water adjustment valve 4 opens and the detected flow rate of the water flow rate detector 11 increases, and the sum of the detected flow rate of the water flow rate detector 1] and the detected flow rate of the stock solution flow rate detector 12 reaches the maximum injection. The grout concentration is determined from the flow rate detected by the water flow rate detector 11 and the flow rate detected by the stock solution flow rate detector 12, and the concentration is lower than a preset concentration. In this case, the stock solution adjustment valve 8 is operated so that the flow rate of the stock solution flowing from the stock solution adjustment valve 8 into the stock solution flow rate detector 12 is increased by an appropriate amount, and the concentration of the grout is adjusted to maintain a preset concentration.

On the other hand, if the concentration of grout is to exceed a preset concentration, a flow rate sensor 12 for the raw solution is detected from the raw solution regulating valve 8.
The stock solution regulating valve 8 is adjusted so as to reduce the amount of stock solution flowing into the tank appropriately.

In the first half of injection, the water flow rate detector 11 and the stock solution flow rate detector 1
2, the opening degree of the water flow rate regulating valve 4 is appropriately adjusted so that the sum of the detected flow rate of the water flow rate detector 11 and the detected flow rate of the raw solution flow rate detector 12 does not exceed the maximum flow rate. At the same time, the concentration of the grout is known from the flow rate detected by the water flow rate detector 11 and the raw solution flow rate detector 12, and the raw solution regulating valve 8 is operated to maintain the set concentration, so that the detected pressure of the pressure detector 15 becomes the set pressure. Continuously reaching [knocked]. When the pressure detected by the pressure detector 15 reaches the set pressure, the injection enters the latter half of injection, in which the injection flow rate is gradually reduced so as not to exceed the set pressure.

In the latter half of the injection, when the detected pressure of the pressure detector 15 is about to exceed the preset set pressure, the opening degree of the water regulating valve 4 is adjusted appropriately to reduce the amount of water flowing into the water flow rate detector 11. At the same time, the grout concentration is determined from the flow rate detected by the water flow rate detector 11 and the flow rate detected by the raw solution flow rate detector 12, and the raw solution regulating valve is adjusted to maintain the set concentration.

Note that the pressure detector 15 for detecting the pressure of the grout is installed on the outlet side of the mixer 14;
If the pressure loss is sufficiently small compared to the injection pressure, it may be installed in the mixing pipe 13 on the inlet side of the mixer 140, between the water regulating valve 4 of the water supply pipe 2 and the junction 10, and in the stock solution supply pipe 6. It may be provided between the stock solution regulating valve 8 and the confluence point 10.

Further, the flow rate of Grau l- can be determined from the water flow rate detector 11 and the stock solution flow rate detector 12 by the dotted line, but a separate combined flow rate detector (not shown) may be provided in the combined pipe 13 or the injection pipe 16. . Furthermore, there is no problem in providing any two of the three water flow rate detectors 11, undiluted solution flow rate detector 12, and combined flow rate detector, and finding the other one by calculation.

FIG. 2 shows an example of a control circuit block diagram for the above-mentioned injection control device, in which 19 is a flow rate pressure calculation circuit that presets the maximum flow rate FW maximum pressure Pw specified in construction specifications, etc., and 20 inputs the detected pressure P of the pressure detector 15, the detected flow @QW of the water flow rate detector 11, and the detected flow rate Qg of the raw solution flow rate detector 12, and calculates the maximum pressure pw of the set value of the flow rate pressure calculation circuit 19 and the pressure detection. The detected pressure [ ] of the water flow rate detector 15 is compared, and the sum of the detected flow rate QW of the water flow rate detector 11 and the detected flow rate QO of the raw solution flow rate detector 12 is compared with the maximum flow rate Fw of the set value of the flow rate pressure calculation circuit 19. This is a flow rate pressure comparison circuit that sends a control signal to the water adjustment valve drive circuit 21 that drives the water adjustment valve 4 based on the result.

22 is a constant necessary to calculate the concentration of the combined liquid (grout) from the detected flow NQW of the water flow rate detector 11 and the detected flow MQq of the raw solution flow rate detector 12, that is, the concentration of the raw solution Ko cement specific gravity [) C bentonite specific gravity A constant calculation circuit 23 presets Db and the concentration of bentonite mixed into cement, etc., and a constant calculation circuit 23 calculates the concentration of the combined liquid from the set value of the constant calculation circuit 22 and the detected flow rate of the water flow rate detector 11 and the raw solution flow rate detector 12. A concentration calculation circuit 24 calculates the concentration by calculation, a depth calculation circuit 24 presets the concentration to be injected, and 25 compares the concentration of the combined liquid calculated by the concentration calculation circuit 23 with the IK set by the Ia degree calculation circuit 24. The Ia degree comparison circuit sends a control signal to the stock solution adjustment valve drive circuit 26 that drives the stock solution adjustment valve 8 based on the result.

In FIG. 2, the maximum flow rate FW is input to the flow rate pressure calculation circuit 19.
and the maximum pressure P to V, set the concentration of the stock solution [KO cement specific gravity [)C bentonite specific gravity Db] and the mixing ratio of bentonite to cement in the constant calculation circuit 22, and set the grout to be injected in the concentration calculation circuit 24. Set the concentration of

When the water pump 3 and the stock solution pump 7 operate and the water regulating valve 4 opens, the water flow rate detector 11 and the pressure detector 15 output signals corresponding to the detected values. The detected flow rate Qw of the water flow rate detector 11 is inputted to the flow rate comparison circuit 20 and the 'a opening calculation circuit 23, and the detected pressure P of the pressure detector] 5 is inputted to the flow rate pressure comparison circuit 20. In the flow rate pressure comparison circuit 2o, the detected pressure P of the pressure detector 15 is first calculated by the flow rate pressure calculation circuit 19.
When the detected pressure P exceeds the maximum pressure Pw, the water adjustment valve drive circuit 21 issues a signal to close the opening of the water adjustment valve 4. Also, if the detected pressure is lower than the maximum pressure pw, the flow rate pressure comparison circuit 2
0, the sum of the detected flow rate @QW of the water flow rate detector 11, the detected flow rate Qq of the raw solution flow rate detector 12 (the detected flow rate O in the initial state of the raw solution regulating valve 8), and the maximum flow rate F of the flow rate pressure calculation circuit 19.
If the flow is below the maximum flow NEW, the flow pressure comparison circuit 20 sends a signal to the water adjustment valve drive circuit 21 to open the water adjustment valve 8, and if the flow exceeds the maximum flow FW. If so, a reverse signal is sent and the water regulating valve 4 is adjusted so that the detected flow rate and pressure do not exceed the set flow rate and pressure.

In addition, the concentration calculation circuit 23 calculates the combined liquid based on the detected flow rate Qw of the water flow rate detector 11 and the detected flow rate Qg of the raw solution flow rate detector 12 that are input to the concentration calculation circuit 23 and the set value set in the constant calculation circuit 22. When calculating the concentration of the grout, if the undiluted solution has not yet flowed in, the detected flow rate QQ of the undiluted solution flow rate detector 12 is O, so the calculated concentration also becomes 0, and the concentration of the grout set in the depth calculation circuit 24 is reached. Because it has not reached
A signal is output from the concentration comparison circuit 25 to the stock solution adjustment valve drive circuit 26 to increase the amount of stock solution flowing from the stock solution adjustment valve 8 toward the stock solution flow rate detector 12. When the stock solution flows from the stock solution adjustment valve 8 to the stock solution flow rate detector 12 side, a detected flow rate QCJ is outputted, and the outputted detected flow ffiQg is manually inputted to the flow rate pressure comparison circuit 20 and the concentration calculation circuit 23.

Raw solution flow rate detector 12 input to flow rate pressure comparison circuit 20
The detected flow rate QCJ is the detected flow rate Qw of the water flow rate detector 11.
and the detected pressure P of the pressure detector 15 becomes the set pressure P.
If the detected flow rate Q (J and Qw) is lower than the set flow rate Fw, then the opening of the water regulating valve 4 is opened, and if the sum of J and Qw is lower than the set flow rate Fw, the detected flow rate is compared with the set flow rate FW. In this case, the reverse operation is performed by sending the water to the water regulating valve drive circuit 21 and adjusting the water regulating valve 4.

Also, the undiluted solution flow rate detector 1 input to the 'a opening calculation circuit 23
The concentration of the combined liquid is calculated in the concentration calculation circuit 23 from the detected flow ffiQg of No. 2, the detected flow rate QW of the water flow rate detector 11 input in the same way, and the set value set in advance in the constant calculation circuit 22. The result is sent to the concentration comparison circuit 25 and compared with the set concentration of the concentration calculation circuit 24, and if the set concentration has not been reached, the flow rate of the stock solution flowing from the stock solution regulating valve 8 to the stock solution flow rate detector 12 side is increased. If the concentration exceeds the set concentration, a signal is sent to the undiluted solution regulating valve drive circuit 26 to perform the opposite movement, and the undiluted solution regulating valve 8 adjusts the concentration of the combined solution.

It should be noted that the 'a opening degree comparison circuit 25 does not use the grout concentration inputted to the concentration calculation circuit 24h16, but automatically calculates the grout concentration based on the concentration switching conditions specified by the construction specifications, etc., and information on the injection flow rate and pressure. It is also possible to input a concentration instruction from an automatic concentration switching instruction circuit (not shown) that can be used to specify concentration. In this case, the operator does not have to set the concentration in the concentration calculation circuit 24 each time, Injection that satisfies the switching conditions can be performed automatically.

[Effect of the invention] This invention is configured as described above and has the following effects.

(1) The flow rate, pressure, and concentration can be controlled by simply adding a water flow rate detector and a water regulating valve to the conventional device, so the conventional device can be used.

(2) Since the device can be used near the injection site, it is possible to quickly respond to yA degree changes without delay, and the amount of grout waste can be minimized, reducing the cost of materials such as cement and waste. Reduction in grout processing costs, injection]
This can significantly reduce strikes.

(3) Since grout is mixed with water and the stock solution immediately before injection to adjust the desired concentration, the scale of the equipment is approximately 173 mm compared to the conventional method, which always produces grout at the required concentration.
It can be made lighter and smaller.

(4) By pouring water first and allowing the undiluted solution to join together after a while, the undiluted solution will not flow directly into the ground under any circumstances, making it possible to inject stable and highly reliable Cf1j grout. It has excellent construction properties.

(5) The current density switching is as follows: W/C is 10.8.6
．． 4.2.1 etc., which is carried out in stages with integer values,
Since the concentration can be adjusted quickly and steplessly, it is not constrained by conventional Glx switching standards and can contribute to the development of a new construction technology that changes the concentration with higher injection effects.

[Brief explanation of drawings]

FIG. 1 shows an example of a grout injection system diagram, and FIG. 2 shows an example of a grout injection control circuit block diagram. 1... Water storage tank 2... Water supply pipe 3... Water pump 4... Water adjustment valve 5... Raw solution storage tank 6...
Stock solution supply pipe 7... Stock solution pump 8... Stock solution adjustment valve 9... Return pipe 10... Merging point 11... Water flow rate detector 12... Stock solution flow rate detector 13... Merging Pipe 14...Mixer 15...Pressure detector 16
...Injection pipe 17...Ground side injection pipe 18...Ground]9...Flow rate pressure calculation circuit 20...Flow rate pressure comparison circuit 21...Water adjustment valve drive circuit 23...Concentration calculation Circuit 25...'a opening degree comparison circuit 22... Constant calculation circuit 24... Concentration calculation circuit 26... Stock solution adjustment valve drive circuit

Claims (3)

[Claims] (1) The water in the water storage tank is sent to the confluence pipe via the water pump, water adjustment valve, and water flow rate detector, and the undiluted solution in the undiluted solution storage tank is sent through the undiluted solution pump, the undiluted solution adjustment valve, and the undiluted solution flow rate detector. The water is then sent to a merging pipe and combined with the above water, and the pressure detected by a pressure detector installed in the merging pipe or the injection pipe following it, the sum of the detected flow rates of the water flow rate detector and the raw solution flow rate detector, or the merging pipe or injection pipe. Adjust the water adjustment valve so that the flow rate detected by the combined flow rate detector installed at , and the specific gravity of the raw material set in advance,
Knowing the concentration of the combined liquid, that is, the grout, from constants such as the mixing ratio,
A grout injection control method, characterized in that grout is injected by adjusting a stock solution regulating valve so that the concentration is specified. (2) A water adjustment valve and a water flow rate detector that adjust the amount of water sent from the water supply pipe to the merging pipe, and a undiluted solution adjustment valve and undiluted solution flow rate detector that adjust the amount of undiluted solution sent from the undiluted solution supply pipe to the merging pipe. and/or a merging flow rate detector installed in the merging pipe or injection pipe, and a pressure detector for detecting the pressure of the grout formed by merging in the merging pipe, or the pressure of the water and/or raw solution before merging. A grout injection control device characterized by: (3) A flow rate pressure setting circuit for setting the meteor and pressure limits when injecting grout into the ground, that is, the maximum flow rate and maximum pressure, and the pressure detector, water flow rate detector, and raw solution flow rate detector according to claim 2. , and/or a flow rate pressure comparison circuit that inputs and calculates and compares the detected values of the combined flow rate detector, and a water adjustment valve drive circuit that operates a water adjustment valve based on the result of the flow rate pressure comparison circuit, and the water flow rate detector , constants such as the concentration of the raw solution, specific gravity of cement, specific gravity of bentonite, and mixing ratio of bentonite to cement, which are necessary to calculate the concentration of the combined liquid based on the detected flow rate of the raw liquid flow rate detector and/or the combined flow rate detector. A concentration calculation circuit that calculates the concentration of the combined liquid, that is, grout, from a preset constant setting circuit, the detected flow rate of the water flow rate detector, the raw solution flow rate detector, and/or the combined flow rate detector, and the set value of the constant setting circuit. and a concentration setting circuit that presets the grout concentration, or a concentration indicating circuit that can automatically indicate the grout concentration based on the concentration switching conditions, injection flow rate, and detected values of injection pressure, and the concentration determined by calculation. 1. A grout injection control circuit comprising: a concentration comparison circuit that compares a set or instructed concentration; and a stock solution regulating valve drive circuit that drives a stock solution regulating valve based on the result of the concentration comparison circuit.