JP3353183B2 - Mud water property measurement method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring properties of muddy water used in a drilling method such as a mud shield method, a continuous underground wall method or a reverse method.

[0002]

2. Description of the Related Art A large amount of muddy water generated by an excavation method is discarded as industrial waste, and a part of the muddy water is reused for transporting excavated earth and sand while stabilizing a face and a groove wall.
In order to control the properties of the mud required for this reuse, measurement of the mud specific gravity using a mud balance, a funnel viscometer (V
= 500 cm ³ ), and the measurement of the sand content using a sand meter was performed manually.

[0003]

However, manual measurement has the disadvantage that accurate measurement values cannot be obtained due to the inclusion of artificial errors, and measurement cannot be performed in a shorter time. .

A measuring apparatus and a measuring method in which a part of the measuring operation is automated are described in JP-A-3-14839 and JP-A-1-169090. The measuring device described in Japanese Patent Application Laid-Open No. 3-148039 automates the measurement of the specific gravity of muddy water and the funnel viscosity. However, since the measurement of the sand content must be performed manually, human errors cannot be eliminated, and it takes a long time to complete the measurement.

[0005] The measuring method described in Japanese Patent Application Laid-Open No. 1-169090 selectively measures the sand fraction and the specific gravity of muddy water and the funnel viscosity. However, the measurement of the funnel viscosity shown in the publication is different from the actual funnel viscosity of the muddy water because the muddy water after removing the sand is used. In addition, the measurement of sand content, the specific gravity of muddy water, and the measurement of funnel viscosity cannot be performed continuously, so it takes not only a long time to complete all measurements but also the same muddy water to be measured. There was a disadvantage that it could not be used.

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide a method and an apparatus for measuring the properties of mud which can measure the specific gravity, viscosity and sand content of the mud automatically and in a short time with high accuracy and continuously. I do. It is a second object of the present invention to provide a mud property measuring apparatus capable of automatically measuring the specific gravity and viscosity of mud before classifying sand.

[0007]

According to the method for measuring the properties of muddy water of the present invention, the step of measuring the weight of muddy water stored in the muddy water measuring container 20, the flow of muddy water from the muddy water measuring container 20, and the completion of the outflow. Measuring the required outflow time, then classifying the sand contained in the mud drained from the mud measuring container 20, measuring the weight of the classified sand, and measuring the mud weight and the mud measuring container The method includes the steps of calculating a specific gravity from the amount of muddy water stored in the tank 20, calculating a viscosity based on the outflow time, and calculating a sand fraction based on the weight of the sand.

The muddy water property measuring apparatus according to the present invention requires first weight measuring means 22 for measuring the weight of the muddy water stored in the muddy water measuring container 20, and the muddy water flowing out of the muddy water measuring container 20 until the outflow ends. Outflow time measurement means 22 for measuring the outflow time, classification means C for classifying sand contained in the muddy water flowing out of the muddy water measurement container 20, and second weight measurement means 29 for measuring the weight of the classified sand content A specific gravity calculating means 37a for calculating the specific gravity from the muddy water weight and the amount of muddy water stored in the muddy water measuring container 20, a viscosity calculating means 37c for calculating the viscosity of the muddy water based on the outflow time, and a classified sand component. Sand content calculating means 3 for calculating the sand content based on the weight
7d.

[0009]

The operation of the present invention is as follows. The weight of the muddy water and the amount of muddy water before the classification of the sand are measured, and the muddy water is discharged from the muddy water measuring container, and the outflow time required until the outflow is completed is measured. Then, the sand content contained in the muddy water discharged from the muddy water measuring container is classified, and the weight of the classified sand is measured.

The specific gravity of the mud is calculated from the mud weight and the amount of mud, and the viscosity of the mud is calculated based on the outflow time of the mud. In addition, the sand content of the muddy water is calculated based on the weight of the sand.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the entire muddy water property measuring apparatus of the present invention, FIG. 2 is an enlarged front view of a main part thereof, and FIG. 3 is a side view thereof. The apparatus includes an adjusting tank 1 for temporarily storing muddy water fed from a shield device or the like (not shown), a cushion tank A for releasing the muddy water supplied from the adjusting tank 1 to the atmosphere, and a specific gravity of the muddy water. A muddy water measuring section B for measuring viscosity, a classifying section C as a classifying means for classifying sand in muddy water flowing out of the muddy water measuring section B, and a control section D for controlling driving of each section of the present apparatus. The cushion tank A, the muddy water measuring section B, and the classifying section C are arranged on the frame body FL.

The frame body FL comprises four standing frames 2
And a large frame 7 in which the upper end, intermediate portion and lower end of the upright frame 2 are connected by connecting frames 3, 4, 5 and 6, respectively, and a small frame 8 arranged on the upper portion. The muddy water measuring section B is mounted on the connecting frame 4 of the large frame 7, and the classifying section C is mounted on the connecting frame 5. A ladder F is provided on the back side of the frame body FL.
La is provided.

The small frame 8 is composed of four standing frames 8a erected on the intermediate portion of the connecting frame 3 of the large frame 7, and the upper ends thereof are connected by connecting frames 8b, 8b, 8c, 8c. The connection frames 8b and 8c
The cushion tank A is placed on the top.

A suction pump P for feeding muddy water temporarily stored therein to the cushion tank A is disposed in the adjusting tank 1, and a mud feeding pipe is provided between the suction pump P and the cushion tank A. 9 are provided. Also,
A branch pipe 10 for returning muddy water supplied from the suction pump P to the adjusting tank 1 is formed in the middle of the mud feeding pipe 9, and a cushion tank A is formed from the branch pipe 10.
The three-way valve 11 is provided in a portion reaching.

The three-way valve 11 has a path (a) from the mud feed pipe 9 to the cushion tank A, and a path (b) for discharging muddy water stored in the overflow cylinder 12 described later of the cushion tank A from the discharge pipe 13. And is switched at a predetermined timing by a drive signal from the control unit D.

The cushion tank A is connected to the three-way valve 11 and has an overflow cylinder 12 provided with a screen 12a for removing dust contained in muddy water, and a mud receiving tank 14 having the overflow cylinder 12 fixed to the center of the bottom plate.
And an outflow pipe 15 fixed to an end of the bottom plate 14a.

The muddy water fed from the three-way valve 11 to the overflow cylinder 12 is cleaned of dust by the screen 12a, flows out of the upper part of the overflow cylinder 12 into the mud receiving tank 14, and is released to the atmosphere. It flows down from the outflow pipe 15 to the muddy water measuring section B via the outflow pipe 15a.

Above the cushion tank A, a mud receiving tank 1 is provided.
4 and three shower nozzles 16 for cleaning the inside of the overflow cylinder 12 are arranged. Further, an opening / closing valve 18 driven by the control unit D is provided in the middle of a water supply pipe 17 for supplying the washing water to the shower nozzle 16.

The muddy water measuring section B has a cylindrical hopper 19
A funnel viscometer 20 as a muddy water measuring container, an outflow valve 21 provided at an outlet 20a of the funnel viscometer 20, and a first weight for measuring the weight of muddy water stored in the funnel viscometer 20 Load cell 22 as measuring means and outflow time measuring means, and shower nozzle 2
3, 23, 24.

On the side wall of the hopper 19, the amount of mud stored in the funnel viscometer 20 is kept constant.
A surplus discharge pipe 19a for discharging surplus muddy water is connected, and the discharged surplus muddy water is discharged to the outside via a discharge pipe 19b.

The funnel viscometer 20 has a capacity V of 2
It is 400 cm ³ . The outlet 20a is formed to have a larger diameter than that of a general funnel viscometer (V = 500 cm ³ ) so as to prevent sand and the like contained in muddy water from clogging.

The shower nozzles 23, 23
9 and the funnel viscometer 20 are disposed at positions for cleaning muddy water, and the shower nozzle 24 is disposed at a position for cleaning muddy water within the surplus discharge pipe 19a. A water supply branch pipe 25a for supplying wash water to these shower nozzles 23, 23, 24 is connected to a water supply pipe 25 formed by branching from the water supply pipe 17 and includes a control unit. An opening / closing valve 26 driven by D is provided.

The classifier C comprises a sieve 27 for classifying sand contained in muddy water flowing out of the funnel viscometer 20, a chute 28 having the sieve 27 mounted therein, and a pair of second weight measuring means. , And shower nozzles 30a, 30b.

The chute 28 has a cylindrical portion 28a and a funnel portion 28 formed in an inverted conical shape below the cylindrical portion 28a.
b and the discharge pipe 28c are integrally formed,
It is supported by three cylinders 31 mounted on the connecting frame 5 so as to be able to move up and down.

The pair of load cells 29, 29 are disposed on both sides of the funnel 28b of the chute 28, and the outer wall of the funnel 28b is provided with a contact piece 28d, 28d are provided. These contact pieces 28d, 28d
When the cylinder rod 31a is driven to extend, it is separated from the load cells 29, 29, and when the cylinder rod 31a, 31a is driven to retract, it comes into contact with the load cells 29, 29.

The sieve 27 is rotatably supported in a vertical plane about a pair of shafts 32 and 33 provided opposite to the side wall of the cylindrical portion 28a of the chute 28. A vibrator 34 for giving required vibration to the sieve 27 is attached to one shaft 32 of the pair of shafts 32, 33, and a motor M as a reversing means for rotating the sieve 27 is mounted on the other shaft 33. Has been fixed.

The vibrator 34 provides a vibration for classifying sand contained in the muddy water supplied to the sieve 27. The motor M moves the sieve 27 between a horizontal posture receiving muddy water and a posture turned 180 degrees from the posture and turned over.
Is reciprocally inverted. Therefore, the sand remaining on the sieve 27 is discarded downward by the reversing operation.

The shower nozzles 30a and 30b are arranged above the chute 28, and one of the shower nozzles 30a and 30b is used as the shower nozzle 30a.
Is for injecting washing water linearly toward the sieve 27, thereby functioning as a muddy water film breaking means for breaking up a muddy water film formed on the sieve 27.

The other shower nozzle 30b is configured to jet cleaning water conically so as to wash muddy water adhering to the chute 28 and the sieve 27. In the middle of the water supply pipe 25 reaching the shower nozzles 30a and 30b,
An opening / closing valve 35 driven by the control unit D is provided.

The control unit D includes a control panel 36 provided with a display lamp, a printer, and the like, a CPU (Central Processing Unit) 37 for taking in measured values from the load cells 22, 29, etc., performing calculations, and outputting the measured values to the outside. A programmable sequencer 38 serving as a control center of the entire apparatus, and a storage unit MR constituted by a ROM (Read Only Memory) storing programs, data, and the like to be executed by the CPU 37.
(See FIG. 4).

The storage unit MR stores the following programs and the like. (1) A muddy amount correction program in which a correction formula for correcting the muddy amount based on a change in viscosity of the mud stored in the funnel viscometer 20 is coded. That is, when the viscosity of the mud changes, the surface tension also changes, and the amount of mud actually stored in the funnel viscometer 20 increases or decreases. Therefore, the amount of muddy water actually stored in the funnel viscometer 20 is obtained by correcting the amount of muddy water by the change in viscosity of the muddy water.

(2) A specific gravity calculation program for calculating the specific gravity by dividing the weight of the mud stored in the funnel viscometer 20 by the corrected amount of mud. (3) A viscosity calculation program coding a relational expression between the time from the start of muddy water discharge to the end thereof and the viscosity.

(4) A program for calculating the percentage of sand in which a relational expression between the weight of the sand measured by the load cells 29, 29 of the classifying section C and the percentage of sand is coded. That is, since the relationship between the amount of muddy water, the weight of sand contained therein, and the sand content is expressed by a predetermined formula, the sand content is calculated from the amount of muddy water and the weight of sand content. (5) Mud water outflow time from the funnel viscometer 20;
Conversion formula with the outflow time of muddy water from a general funnel viscometer (V = 500 cm ³ ).

The CPU 37 has the following functions based on the above programs and the like. (1) Correction means 37b (see FIG. 4) for correcting the amount of muddy water stored in the funnel viscometer 20 by a muddy water amount correction program stored in the storage unit MR. (2) Specific gravity calculating means 37a for calculating the specific gravity of muddy water by a specific gravity calculation program stored in the storage unit MR. (3) A viscosity calculating unit 37c that calculates the viscosity of the muddy water according to the viscosity calculation program stored in the storage unit MR. (4) A sand content calculating means 3 for calculating the sand content of the muddy water by the sand content calculation program stored in the storage unit MR.
7d.

The operation of the present apparatus will be described with reference to the flowchart shown in FIG. <Measurement of muddy water weight> In steps 1 to 5, the weight of muddy water stored in the funnel viscometer 20 is measured.

Step 1 (indicated by S1 in the figure; the same applies hereinafter): The outflow valve 21 of the muddy water measuring section B is closed, and the empty weight of the entire muddy water measuring section B is measured by the load cell 22. Step 2: rods 31a, 31 of cylinders 31, 31
The classifier C is driven to degenerate, the classifier C is supported by the load cells 29, 29, and the empty weight of the entire classifier C is measured. These empty weights are stored in a main memory (not shown) in the CPU 37.

Step 3: The three-way valve 11 is opened for a predetermined time to feed a required amount of muddy water to the cushion tank A. The fed mud is supplied from the outflow pipe 15 to the funnel viscometer 20 of the muddy measuring section B. At this time, muddy water injected over the capacity of the funnel viscometer 20 is
It is discharged outside from the surplus discharge pipe 19a.

Step 4: After a predetermined time has elapsed, the weight of the entire muddy water measuring section B after supplying the muddy water to the funnel viscometer 20 is measured by the load cell 22.

Step 5: If the weight of the entire muddy water measuring section B is equal to or greater than the preset reference weight, the weight of the muddy water is calculated by subtracting the empty weight of the muddy water measuring section B from that weight. And then proceeds to step 6.

If the total weight of the muddy water measuring section B is less than the reference weight, the process proceeds to step 12, in which the muddy water supply is reported as abnormal by a buzzer or the like, and the measuring operation is stopped. Step 6: While activating the vibrator 34,
Open the on-off valve 35 to open the shower nozzles 30a, 30b
Spray the washing water from.

<Measurement of Outflow Time of Mud Water Flowing Out from Funnel Viscometer> In steps 7 to 9, the outflow time of mud water flowing out of the funnel viscometer 20 is measured.

Step 7: Open the outflow valve 21 to allow the muddy water stored in the funnel viscometer 20 to flow out. When the outflow valve 21 is driven to open, the load cell 2
2, the change in the weight of the entire muddy water measuring section B is measured.
Further, the discharged muddy water passes through the sieve 27 of the classifying section C, which is vibrated while the washing water is jetted, and at this time, the sand contained in the muddy water is classified.

Step 8: If there is no change in the weight of the entire muddy water measuring section B before the reference time, the flow proceeds to Step 10 to notify the abnormal outflow of the muddy water by a buzzer or the like and perform the measuring operation. To stop.

Step 9: If there is no change in the weight of the muddy water measuring section B, the time until the change in the weight disappears is
The outflow time of a general funnel viscometer (V = 500 cm ³ ) is converted by the conversion formula stored in the storage unit MR, and this time is stored as the outflow time of the muddy water, for example, in the main memory, etc. Proceed to 11. On the other hand, if there is a change in the weight of the muddy water measuring section B, step 8
Return to

<Calculation of viscosity and specific gravity of muddy water and correction of muddy water amount> In step 11, calculation of viscosity and specific gravity of muddy water and correction of muddy water amount are performed. Step 11: The viscosity of the muddy water is calculated by the viscosity calculating means 37c based on the outflow time of the muddy water stored in the main memory or the like. The amount of muddy water stored in the main memory or the like is corrected by the correcting means 37b.
Further, the specific gravity calculating means 37a calculates the specific gravity by dividing the muddy water weight by the corrected muddy water amount.

Step 12: The open / close valve 26 is opened for a predetermined time, and the funnel viscometer 20 is washed by the shower nozzles 23, 23.

<Calculation of Sand Fraction> Step 13: After a lapse of a predetermined time, the vibrator 34 is stopped, and the open / close valve 35 is closed.
Is driven to retract. Thereby, the classification part C
Is measured by the load cells 29, 29. The sand content calculating means 37d calculates the sand content from the measured sand content and the corrected muddy water amount. Through the above steps, the calculation of the specific gravity, the viscosity, and the sand content is completed. The following steps are cleaning operations of each part. Step 14: The opening and closing valve 18 and the opening and closing valve 26 are opened, and the cushion tank A and the funnel viscometer 20 are washed.

Step 15: After closing the open / close valves 18, 26, open / close the open / close valve 3 of the shower nozzles 30a, 30b.
5 and the vibrator 34 is activated and the sieve 27 is opened.
And the hopper 28 are cleaned. Step 16: After the sand is discarded by inverting the sieve 27 several times, the vibrator 34 is stopped. If the muddy water measurement is to be performed again after the above muddy water measurement operation is completed, the process returns to Step 1 and the measurement is repeated.

The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the invention. (1) In the above embodiment, an example was described in which only one shower nozzle 30a was provided as muddy water film breaking means, but a plurality of shower nozzles may be provided.

(2) If the funnel viscometer (V = 2400 cm ³ ) described in the above embodiment is used, the measurement error can be reduced, but a general funnel viscometer (V = 500 cm ³ ) can be used. May be used.

(3) The reversing means is not limited to the motor, and an actuator such as a pneumatic or hydraulic cylinder may be used.

(4) In the above embodiment, when the sand is dumped from the sieve, the vibrator 34 is used to invert the sieve while applying vibration, but the sieve is inverted without applying vibration. Is also good.

[0053]

According to the present invention, the following effects can be obtained. (1) After measuring the weight of muddy water containing sand, the muddy water is drained from the muddy water measuring container, and the outflow time required until the end of the outflow is measured. Therefore, the muddy water is actually used before the sand is classified. The data required for calculating the specific gravity and the viscosity of the muddy water can be continuously obtained, and the specific gravity and the viscosity can be accurately calculated.

(2) Since the amount of muddy water is corrected based on the change in viscosity of muddy water, even when the viscosity of muddy water changes, the actual amount of muddy water stored in the muddy water measurement container can be obtained. Thereby, the specific gravity and viscosity of the muddy water can be obtained more accurately.

(3) If the viscosity of the muddy water is calculated based on the time from the start of the outflow of the muddy water from the muddy water measuring container until the change in weight is eliminated, a photoelectric sensor or the like for detecting the outflow of the muddy water is separately installed. It is not necessary to perform the measurement, and the reliability of the measurement can be improved.

(4) When the muddy water film breaking means is provided,
Since the mud film formed on the sieve can be rapidly destroyed, the weight of the sand can be accurately measured, and the measurement time can be shortened. Furthermore, if a shower nozzle is used as the muddy water film breaking means, the muddy water film can be easily broken with a simple structure.

[Brief description of the drawings]

FIG. 1 is a front view showing the entire muddy water property measuring device of the present invention.

FIG. 2 is an enlarged front view of the main part.

FIG. 3 is a side view thereof.

FIG. 4 is a block diagram illustrating an electrical configuration of a control unit.

FIG. 5 is a flowchart showing the operation of the muddy water property measuring device of the present invention.

FIG. 6 is a flowchart showing a continuation of the operation shown in FIG. 5;

[Description of Signs] 20 Funnel viscometer as muddy water measuring container 22 Load cell as first weight measuring means and outflow time measuring means 27 Sieve 29 Load cell as second weight measuring means 30a Shower nozzle as muddy water film breaking means 34 Vibrator 37a Specific gravity calculating means 37b Correcting means 37c Viscosity calculating means 37d Sand fraction calculating means B Muddy water measuring section C Classifying section as classifying means M Motor as inverting means

Continuing on the front page (72) Inventor Tatsuaki Yotsuka 2-5-12 Higashikanda, Chiyoda-ku, Tokyo Environmental Engineering Co., Ltd. (72) Mikio Suzuki 2-5-1-12 Higashikanda, Chiyoda-ku, Tokyo Environment Engineering Co., Ltd. (56) References JP-A-3-148039 (JP, A) JP-A-1-169090 (JP, A) JP-A-4-109354 (JP, U) (58) Fields surveyed (Int .Cl. ⁷ , DB name) G01N 11/00-11/16 E21B 21/00 E21D 9/06 301 G01N 5/00 G01N 9/36

Claims (9)

(57) [Claims] A step of measuring the weight of the mud stored in the mud measuring container, and causing the mud to flow out of the mud measuring container;
Measuring the outflow time required until the end of the outflow; thereafter, classifying sand contained in the mud discharged from the mud measuring container; measuring the weight of the classified sand; and Calculating a specific gravity from the amount of muddy water stored in the muddy water measuring container, calculating a viscosity based on the outflow time, and calculating a sand fraction based on a weight of the sand. The method for measuring the properties of muddy water characterized by the following. 2. The method for measuring the properties of muddy water according to claim 1, wherein the time from when the muddy water flows out of the muddy water measuring container to when there is no change in weight is measured as the muddy water outflow time. 3. The method for measuring properties of mud according to claim 1, further comprising the step of correcting the amount of mud stored in the mud measuring container based on the change in viscosity of the mud. 4. The step of classifying sand contained in the muddy water discharged from the muddy water measuring container includes the steps of vibrating a sieve to destroy a muddy water film formed on the sieve, and discarding the sandy content. 4. The method for measuring properties of muddy water according to claim 1, further comprising the step of inverting the sieve. 5. A first weight measuring means for measuring the weight of the mud stored in the mud measuring container, an outflow time measuring means for flowing out the mud from the mud measuring container and measuring an outflow time required until the outflow ends. Classification means for classifying sand contained in the muddy water discharged from the muddy water measurement container, second weight measurement means for measuring the weight of the classified sandy content, muddy water weight and amount of muddy water stored in the muddy water measurement container Specific gravity calculation means for calculating the specific gravity from, viscosity calculation means for calculating the viscosity of the muddy water based on the outflow time, and a sand fraction calculation means for calculating the sand fraction based on the weight of the classified sand An apparatus for measuring the properties of muddy water, comprising: 6. The time from when the muddy water starts flowing out of the muddy water measuring container to when there is no change in weight is defined as the muddy water outflow time, and the viscosity calculating means calculates the viscosity of the muddy water based on the muddy water outflow time. The muddy water property measuring device according to claim 5, characterized in that: 7. The muddy water property measuring device according to claim 5, further comprising a correction means for correcting the amount of muddy water stored in the muddy water measuring container based on a change in viscosity of the muddy water. 8. Classification means includes a sieve for classifying sand contained in muddy water, a vibrator for vibrating the sieve, a muddy film breaking means for breaking muddy water film formed on the sieve, and a sieve. 8. The muddy water property measuring device according to claim 5, further comprising a load cell for measuring the weight of the sand, and a reversing means for reversing the sieve so as to dump the sand. 9. The apparatus for measuring properties of muddy water according to claim 8, wherein the muddy water film breaking means is a shower nozzle for jetting washing water toward a sieve.