JPH0571120A - Soil improvement material mixing and supplying method - Google Patents

Abstract

PURPOSE:To perform continuous mixing correctly as designed in a flow system by throwing cement, fresh water and an additive to keep the optimum gravity in real time according to the filling conditions for cement milk filled in a digging hole in a soft foundation improvement and clearing an estimation error during control. CONSTITUTION:Cement is pneumatic-transported from a hopper 1 to a mixer 5, an additive is supplied by a pump 11' and fresh water is supplied through a control valve 14'. The throw-in amounts of the material are detected by flow meters 13, 15, and the optimum throw-in amounts thereof are measured quickly by controllers 17, 18, 19, 20. Further, the amounts are recorded in real time in a recording device 20. Accordingly, according to the depth of a stirring blade 29 in a digging hole, supplied cement milk 28 is quickly worked at a required gravity, and an estimation error during manufacturing can be cleared so as to manufacture cement milk as designed.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the technical field of performing optimum flow-type control of the improvement material when the improvement material such as soft ground is injected by injecting the improvement material such as cement milk.

[0003]

[0002]

[0004]

2. Description of the Related Art As is well known, in Japan, where the land is narrow, effective use of land is extremely important from all angles, and there are many mountainous areas and forest areas and the coastline is complicated. In the terrain, it is extremely difficult to effectively supply land for a potentially large demand, and in order to meet the rapidly increasing demand, for example, the supply by increasing the strength of so-called soft ground such as near shallow beaches, rivers, lakes and marshes is effective from the old days. As various means, various research and development improvements have been made and put to practical use.

[0005]

Although there is a technique such as a so-called sand drain for improving the ground such as the soft ground, a technique such as a so-called chemical grout method for positively injecting the improving material into the improved ground is rapid. Has spread to.

[0006]

However, since injection of the seed improving material into the ground, improvement through stirring, etc. may cause pollution problems such as groundwater contamination in the ground, so that proper injection as designed by equivalence mixing Is strongly demanded, and continuous mixing technology through automatic control is being adopted.

[0007]

[0005]

[0008]

By the way, in the conventional continuous injection technique by automatic control of the improved material, since the so-called batch type aspect is adopted, the agitator is connected to the mixer. First, a batch of cement milk having a predetermined specific gravity is manufactured by a mixer, and when the whole amount of the cement milk in the mixer can be injected, the agitator in the next stage pressure-feeds it to the improved device. Has been done.

[0009]

[0006] Therefore, not only a mixer and an agitator are required to be installed side by side, but also because of the batch type,
Not only the mixer but also the design volume of the agitator becomes large, the whole becomes bulky and the plant becomes large, and the power of the mixer and the agitator must be designed at the maximum power. Since a large amount of fresh water is added to the mixer and then the measured cement and additives of the improvement material are added at once, it takes a considerable time to disperse the cement and additives in fresh water. However, there is a problem that the operation efficiency is poor and the control management is complicated.

[0010]

[0007] Since it is a batch type, the discharge amount of the transport pump changes drastically.
The mixing ratio of fresh water and additives must be kept constant,
It had the drawback that control, management, and work were extremely complicated.

[0011]

[0008]

[0012]

The object of the invention of the present application is to solve the problem of batch-type supply of an improving material such as cement milk to be used for soil improvement such as soft soil based on the above-mentioned prior art, and to solve the problems. A controller built into a computer can control the drive of the transport pump and automatically control each supply material to allow the appropriate amount of each material to be added in real time and to mix and stir in real time to meet the actually required improvement material. It is possible to pump the improved material, and it is possible to perform accurate improvement work and maintain the strength of the ground as designed, which is an excellent mixed ground improvement material benefiting the field of civil engineering application in the construction industry. It is intended to provide a method.

[0013]

[0009]

[0014]

[Means and Actions for Solving the Problems] In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the above-mentioned object and has the scope of the above-mentioned claims, is constructed in order to solve the above-mentioned problems. When performing ground improvement via the cement milk method etc. for the soft ground, etc., at the start of the work, or at the end of the work, clean water is pressure-fed to the improvement device through the injection hose by the transport pump through the mixer to clean and humidify the Next, while supplying a predetermined amount of improving material such as cement to the mixer, adding a set amount of fresh water and additives, mixing for a predetermined time, uniformly stirring and dispersing, and injecting via a transport pump. The hose is pressure-fed to the improvement device, and in the process, the amount of the improvement material pumped by the transportation pump is detected in a predetermined manner, and the specific gravity is measured by the controller,
Alternatively, the improved state is measured by detecting the depth of the injection pipe of the improved device, and the amount of the improved material and the amount of fresh water and additives added to the mixer are controlled so that the optimum improved state is achieved. The amount of the improving material in the mixer is measured by the liquid level measurement or by the load cell, etc., and the optimum mixing and supplying of the improving material is performed in a flow system. In addition, it is possible to record the data detected or measured during driving in real time and use it as a reference data for the subsequent improvement material injection or the next improvement step. The technical means of doing so.

[0015]

[0010]

[0016]

An embodiment of the invention of this application will be described below with reference to the drawings.

[0017]

In the embodiment shown in FIG. 1, the "a" side shows a control mechanism and the "b" side shows an improved device. In this embodiment, the cement milk 28 for the soft ground 24 is used.
This is a mode of improvement by the improving material, and the cement milk 28 from the injection pipe 27 of the improving device 26 is agitated and injected into the hole 25 formed in the soft ground 24 by the agitating blade 29. 27 is given a predetermined pushing force or a pulling action by the rotation driving device 22, and the depth thereof can be detected by the depth gauge 23.

[0018]

In the control mechanism "a", reference numeral 1 is a cement hopper made of an improved material, which is supported by the load cell 2 of the weight detection device, and the rotary feeder 3 is provided at the discharge port thereof for driving. It is connected to an air transport pipe 4 connected to the device 3 ′ and connected to a predetermined compressed air source, and the tip of the air transport pipe 4 faces the mixer 5.
The mixer 5 is supported by the load cell 6 of the weight detector and its weight is detected, and the cement milk 28
The supply amount of is measured.

[0019]

A stirring blade 5'is provided in the mixer 5 so that the motor 7 can perform a predetermined rotary mixing and stirring action.

[0020]

An injection hose having a transport pump 8 and a flow meter 9 in series at the bottom discharge port of the mixer 5.
10 is connected, the tip of the injection hose 10 is connected to the swivel joint 22 'of the injection pipe 27 of the improvement device 26, is supplied from the injection pipe 27 into the drilled hole 25, and is agitated by the agitating blade 29 in a predetermined manner to inject it. It is supposed to be done.

[0021]

Further, the predetermined additive in solution form from the additive tank 11 is supplied to the mixer 5 by the pump 11 'through the flowmeter 13 through the passage 12 to the mixer 5, and at the same time, the fresh water is added. Fresh water from the tank 14 is also supplied to the mixer 5 via the control valve 14 ′ and the flow meter 15 by the passage 16.

[0022]

The dotted line in the mechanical diagram "a" of FIG. 1 indicates the electrical connection circuit of each mechanical section.
Reference numerals 17, 18, 19, and 20 are controllers each incorporating a predetermined microcomputer, and 17 is an automatic controller for controlling the total amount of cement supplied as the material for the improvement material. The load program of the cement hopper 1 is input with a design program in advance. 2 is electrically connected to the driving device 3'of the rotary feeder 3 as well as is electrically connected to the rotary feeder 2 to output an operation signal in accordance with the flowchart shown in FIG.

[0023]

The controller 18 controls the total supply amount of the cement milk 28 as an improving material, and is electrically connected to the flow meter 9 to input the pumping amount, and
It is connected to the load cell 6 and can be calculated back from its total weight so that the discharge rate can be measured.
It is also electrically connected to the motor 7 to automatically control the rotation speed of the cement milk 28 so that the optimum cement milk 28 is produced, and is also electrically connected to the transportation pump 8 to control the discharge amount. It is designed to be automatically controlled.

[0024]

Numeral 19 is a controller for controlling the total supply of fresh water, which controls the opening / closing of the control valve 14 ', and
The flow meter 15 is used to measure the weight supplied to the mixer 5.

[0025]

Reference numeral 20 is a controller for the supply amount of the additive, which automatically controls the supply amount of the supply pump 11 'so that the flow rate of the flow meter 13 to the mixer 5 can be measured. ing.

[0026]

The controller 18 for controlling the total weight of the cement milk 28 is connected to the controller 17 for control, and the controller 19 for automatic control of fresh water, and
It is also electrically connected to a controller 22 for additive supply control.

[0027]

Reference numeral 21 is a fully automatic recording device, which is a controller 17 for cement, a controller 18 for cement milk, a controller 19 for fresh water, and a controller for additives.
It is electrically connected to 20 so that the measured quantities can be recorded in real time.

[0028]

Further, the depth measuring device 23 for the stirring blade 29 of the improved device 26 is electrically connected to the fully automatic recording device 21 and the cement milk controller 18 so that the depth of the stirring blade 29 can be measured in real time. The amount of cement milk 28 supplied at the depth can be optimally supplied.

[0029]

In the automatic control continuous mixing system having the above-mentioned structure, the procedure of the work will be described with reference to the flow chart shown in FIG. 2. First, the cement used at the start of the soft ground improvement work, the specific gravity of the additive, and the aqueous solution of the additive. Mixing ratio, total length of injection hose 10 and inner diameter,
Initial numerical data such as the drilling diameter, the number of drilling holes, the mixing ratio of cement to the improved ground 24, and the work program are input to the controller 18.

[0030]

When the inside of the injection hose 10 is initially dry, or when there is a residue from the previous work, flow-over resistance at the time of flow type supply of the cement milk 28 and the like are generated, which is as designed. Since it may be difficult to supply water, the total amount of clean water for cleaning and humidifying at the start and end of work is calculated from the total length and inner diameter of the injection hose entered above, and the control valve 14 'is opened to open the fresh water. The fresh water from the tank 14 is supplied into the mixer 5, and in the process, the set amount is supplied by the flow meter 15 and the transport pump 8 is operated to supply the fresh water into the injection hose 10 to perform predetermined cleaning work and humidification. , When the supplied amount is detected by the flow meter 9 and the set amount is supplied, the transportation pump 8 is stopped and the improved ground 1 m
^The controller 18 calculates the required amount of cement milk, the weight of cement, the weight of additive, and the weight of fresh water for ^3. First, the controller 19 opens the control valve 14 ′ by the controller 19 to supply the fresh water into the mixer 5. , When the supply flow rate is detected by the flow meter 15 and reaches a predetermined amount, the control valve 14 'is closed, and then the calculated amount of cement is rotated by the rotary feeder 3 through the driving device 3'. It is supplied to the mixer 5, and the supply amount is detected and measured from the weight input by the load cell 6 of the mixer 5, and
The additive is supplied from the tank 11 to the mixer 5 by the pump 11 ′, and the feed rate of the additive is measured by the flow meter 13 and the load cell 6.

[0031]

Then, the controller 18 rotates the motor 7 and the stirring blade 5'is rotated for a predetermined time by the number of rotations in which the optimum cement milk state is reached, and the optimum cement milk 28
When is manufactured, an injection start command is transmitted to the improvement device 26, the rotary drive device 22 is operated, and the injection pipe 27 is pushed into a predetermined position, or the extraction process is started, and the cement in the hole 25 is cemented. The milk 28 is injected at the same time as the operation of the transport pump 8 is started. At that time, the depth of the stirring blade 29 of the injection pipe 27 is detected by the depth measuring device 27 and input to the controller 18, and the fully automatic recording device 21 is real-time. Is automatically recorded in real time.

[0032]

Of course, the fully automatic recording device 21 inputs and records the input amount and specifications of each material and the like in each process described above.

[0033]

Then, the injection pipe for data of the injection amount change per unit time in the improved process is calculated by the controller 18 by detecting the depth of the stirring blade 29 of the depth gauge 23.
The push-up or pull-up speed of 27 is calculated, and the optimum amount of cement milk 28 supplied per unit time is calculated from the speed, and the transport pump 8 is automatically controlled, and the actual amount of cement milk 28 to be fed is sent. Controls the transport pump 8 so that the required cement milk 28 is detected by the flow meter 9.

[0034]

In addition, cement milk 28 per unit time
In response to the weight of fresh water, the weight of cement, and the weight of the additive, which are calculated from the respective amounts supplied, the fresh water is supplied to the mixer 5 by opening / closing the control valve 14 ', and the cement is driven by the rotary feeder 3 The rotation speed controlled by 3'and the supply of the required weight to the mixer 5 are controlled by the load cell 2, and the additive is fed to the mixer 5 by the weight calculated by the pump 11 'and the flow meter 13. It

[0035]

The work procedure up to this point is as shown in the flowchart of FIG.

[0036]

Therefore, there is a possibility that cumulative errors of cement, fresh water, and additives will occur in the process automatically controlled by the controllers 17, 18, 19, 20. In other words, if the weight of the cement milk 28 in the mixer 5 is within the set numerical range, the controller 18 calculates it based on the weight detected by the load cell 2 and exceeds the allowable range. Regardless of the discharge rate of the transport pump 8, the predetermined coefficient input in advance is multiplied by the set input rates of fresh water, cement, and additive to constantly set the liquid level of the cement milk 28 in the mixer 5 to the set level. Is controlled to automatically set the feed weight for each feed.

[0037]

Then, when the depth gauge 23 detects that the depth of the stirring blade 29 in the drilled hole 25 of the improved ground 24 has reached a predetermined depth, that is, when the predetermined improvement is completed, the feed material is supplied. The transportation pump 8 is also stopped, and the injection pipe 27 of the improvement device 26 is moved to the next drilling hole 25 for phosphorus, and the stirring blade 29 is again exposed to the drilling hole 25. When the depth gauge 23 detects the start depth, the automatic control of all the mechanisms is restarted again, where the improved ground 2
4, or, if there is no change in the specific gravity of the cement milk 28 to be injected according to the properties of the drilled hole 25, all systems continue automatic control with the specific gravity of the cement milk 28 up to that point, and the cement When the change of the specific gravity of the milk 28 is input, the automatic control based on the change instruction is performed according to the procedure of the flow sheet of FIG. 2 according to a predetermined input.

[0038]

When the injection of cement milk 28 in the hole 25 is stopped for the sake of the final hole or design work for design improvement, the operation completion button (not shown) is pressed. Therefore, when the stroke end is reached within the allowable range depending on whether or not the amount of the cement milk 28 in the mixer 5 of the set stroke in the perforated hole 25 after the work is stopped according to the design program is satisfied, Stroke end is controller 18 with depth gauge 23
Detected, where all feeds are stopped, during which the cement milk 28
Is supplied to the injection pipe 27 by the transport pump 8.

[0039]

Of course, during this period, the stirring blade 5'in the mixer 5 is kept at a predetermined rotation speed by the motor 7.

[0040]

When the depth gauge 23 detects the stroke end, it means that the cement milk 28 in the mixer 5 has reached the permissible range close to zero by the above-mentioned process, and therefore the control valve 14 'is opened to clear water. Is supplied to the mixer 5 for a predetermined amount, and is supplied to the inside of the injection hose 10 by the transport pump 8 for cleaning. When the predetermined flow rate is reached, all work steps are completed and the system is stopped.

[0041]

The clean fresh water to be fed at the time of work or at the end of work is the swivel joint 22 of the improvement device 26.
It is designed to be discharged into a designated drain tank immediately before the '.

[0042]

In this way, the cement milk 28 in the improvement work of the entire process can always maintain the optimum mixing level, maintain the specific gravity of the cement milk 28 as designed, and perform continuous flow type supply. ..

[0043]

In the experimental mode as a design example, if the discharge rate of the cement milk transport pump is 100 liters per minute and the time required for mixing in the mixer is 1 minute, the cement in the mixer 5 is Regarding the liquid level of milk, it was found that the volume of cement milk in the mixer could be 9 liters, and in the case where the batch type mode of the general conventional mode is adopted, the discharge time from the mixer to the agitator is The feed time of each feed to the mixer would only be an extra of the total minimum mixing time, which would result in a significant difference in throughput per unit of time, and the flow-type aspect of the invention of this application. In comparison with the batch type, the plant volume is reduced to 1/3 or less even with the mixer alone. Furthermore, from the agitator part or mixer to the agitator. Discharge cock or valve portion at the connecting portion, the inclusion of a power unit of the agitator, the entire volume found to be about 1/10, compact, be lighter, but the compact was found.

[0044]

Further, since the operating capacity is determined by the mixing capacity of the mixer and the power of the agitator is not required, it has been found that the running cost is about ⅕, which leads to cost reduction.

[0045]

The embodiment of the invention of this application is not limited to the above-mentioned embodiments, and the improving material to be applied is not limited to cement milk, but can be applied to other coagulating materials. The aspect of can be adopted.

[0046]

Further, as an application example, not only the mixing mechanism in ground improvement, but also the automatic control continuous mixing for other grout pumps and the like can be applied to the automatic continuous mixing for other chemical grout mortar and the like. That is.

[0047]

[0041]

[0048]

As described above, according to the invention of this application, basically, in the mixed supply method of the ground improvement material used for the soft ground improvement etc., the input amount to the mixer for inputting each supply material is set to the discharge amount of the transport pump. Automatically control the discharge amount (supply amount) of the improvement material by the transportation pump by detecting and measuring the specific gravity through the controller built into the computer and measuring the amount of the improvement material in the mixer. , The input amount of each supply material can be automatically controlled, and the accumulated error of the material of the improvement material and other supply materials to be input into the mixer is cleared, and the reliable improvement in the equivalence relation that mathematically matches the design. An excellent effect is achieved that the materials can be mixed and supplied.

[0049]

[0042] Then, since the optimum mixing and stirring can be performed in real time to the required density, specific gravity, etc. of the improving material at the time of applying the improving material, the desired amount can be accurately fed under pressure. It is possible to ensure the accuracy of ground strength, etc. according to the design, and to achieve an excellent effect that the reliability of construction is significantly improved.

[0050]

Further, in terms of design, the control data is recorded in real time while performing prompt control of not only the improved material but also other input and supply materials, so that the construction after the construction is completed. There is also an advantage that it can be used as reference data for quality control and similar construction.

[0051]

Since it is possible to manage and control the amount of fresh water input as well as the material of the improving material and other improvements, the residue of the improving material is surely cleaned at the start and end of the construction, and the next mixing is performed. There is an effect that the supply of moderate humidity can be performed and the supply can be smoothly performed.

[0052]

In this way, the supply process to the construction site or the state of the improved material such as the desired specific gravity at the construction site can be controlled so as to be detected promptly in real time. There is an effect that construction can be performed.

[Brief description of drawings]

 The drawings are aspects of one embodiment of the invention of this application.

FIG. 1 is a schematic diagram of a construction control mechanism.

FIG. 2 is a flowchart of automatic control.

[Explanation of symbols]

 24 ... Improved ground 26 ... Improvement device 5 ... Mixer 8 ... Transport pump 10 ... Injection hose 17,18,19,20 ... Controller 5 '... Stirring blade

Claims (5)

[Claims] 1. A viscous property improving material for an improving device installed on a predetermined improved ground is added and mixed by a mixer in predetermined amounts of the improving material, fresh water, and additives, and uniformly dispersed by an injection hose through a transportation pump. In the ground improvement material mixed supply method adapted to perform pressure-feeding in a flow system, the discharge amount of the improvement material of the transportation pump is detected and the specific gravity of the improvement material is measured through a controller, and the amount of the improvement material in the mixer is also measured. Is also measured,
Based on these measurement data, the amount of each of the improving material, fresh water, and additive added to the mixer is controlled so that optimum mixing and stirring of the improving material can be performed, and the amount of the improving material, the specific gravity, and the improving material, water injection, A method for mixing and supplying ground improvement material, wherein each detection data of the amount of additives added is recorded in real time. 2. A set amount of fresh water is made to flow from the mixer to the improvement device at the start and end of the operation by the improvement device.
A method for mixing and supplying ground improvement material as described in the item. 3. The method for mixing and supplying ground improvement material according to claim 1, wherein the amount of the improvement material in the mixer is determined by measuring the liquid level. 4. The method for mixing and supplying ground improvement material according to claim 1, wherein the optimum mixing and stirring is performed at an optimum rotation speed of mixing of the mixer. 5. The control of the discharge amount of the improvement material and the addition amounts of the improvement material, fresh water, and additive to the mixer are carried out through a controller by detecting an improved state by an improving device. The method for mixing and supplying ground improvement material according to claim 1.