JPH02296111A - Method and apparatus for measuring flow rate of high pressure ground hardening material and the like - Google Patents

Abstract

PURPOSE:To measure the flow rate of fluid which is sent with pressure at the outside of a measuring pipe by bonding a transducer to which ultrasonic- wave transmitting and receiving elements are molded to the wall of a pressure sending pipe on the discharge side of a high pressure pump, and measuring the difference between the transmitting frequency and the receiving frequency. CONSTITUTION:A measuring pipe 11 passes the lower part of a pipe-passing housing. A transducer 12 to which an ultrasonic-wave transmitting element A and a receiving element B are molded is bonded to the outer wall of the pipe. A pressure sensor 13 is arranged at the wall pipe 13 at the neighboring part of the transducer 12. The transducer 12 and the sensor 13 are connected with cables 14 and 15. The measured values inputted from the transducer and the sensor are operated, and the numerical values are displayed on a display device. In this way, the flow rate of fluid sent with pressure can be measured from the outside of the measuring pipe.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for stabilizing soft ground, the preparation of foundations for structures, and a lining constructed to prevent collapse and water leakage during excavation of horizontal shafts such as tunnels and shafts. The present invention relates to a method and an apparatus for mainly measuring the flow rate of a soil hardening material injected into the ground at high pressure when creating a layer.

[Conventional technology] Conventionally, this type of flow measurement has been carried out using electromagnetic flowmeters, but recently, the injection pressure of soil hardening material has become extremely high, and soil hardening materials with high density and viscosity are being used. As a result, the electrodes and lining exposed on the inner wall of the measurement tube were damaged by fluid pressure and suspended particles.

Therefore, the flow rate measurement of high-pressure soil hardening material has come to be performed on the suction side of the pressure pump.

In addition, pressure measurement and flow rate measurement for pumping soil hardening material are performed separately, although they are closely related in ground injection, and data display and management are also inconsistent.

[Problems to be solved by the invention] With conventional methods, it is not possible to directly grasp the numerical value on the discharge side.
Calculations are cumbersome and inaccurate. Moreover, the flow rate of high-pressure soil hardening material has an extremely important meaning, as it directly affects the target ground and causes ground uplift and cracks, and is correlated with the pumping pressure, so it is important to understand and manage it in a unified manner. This is absolutely necessary.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention adopts a calculation system that utilizes the Doppler effect by transmitting and receiving reflected ultrasonic waves, and performs measurements from outside the measurement tube. This is how it was done. In addition, a pressure sensor is installed near the flow measurement point to enable unified understanding of flow rate data and pressure data, and the measurement system, counter system, and data system are integrated into a unit for efficient operation and management. It has been made possible to do so.

[Function] The ultrasonic waves emitted from the transmitting element of the transducer pass through the pipe wall of the pressure pipe, and are reflected when they hit the air bubbles in the ground hardening material, which is the pumped fluid, the slurry, and the turbulent surface of the liquid (pressure boundary surface). The signal reaches the receiving element and is received. Since the frequency of ultrasonic waves changes in proportion to the flow velocity (Doppler effect), the following relational expression holds true, where Δf is the difference between the frequencies of transmission and reception, and V is the velocity.

t, ==-2°0°S0°f, v In the above relational expression, C is the sound speed of the transducer, θ is the incident angle of the ultrasonic wave, and f is the oscillation frequency.

The frequency of the received ultrasonic waves is electrically converted and input into a counter system, where it is converted into l/min and displayed as a count.

[Example] One embodiment of the present invention will be described below with reference to the drawings.

1 is a tube housing through which a measuring tube 11 passes, a transducer 12 having an ultrasonic transmitting element A and a receiving element B molded thereon is adhered to the outer wall of the tube, and a pressure sensor 13 is arranged on the tube wall alongside this. It is set up. Of course, the transducer 12 may be a single head in which the elements AB are molded into one capsule, or a duel head in which the elements AB are molded in separate capsules.

Reference numeral 2 denotes a counter system, which is equipped with a main power source 21, connects a transducer 12 and a pressure sensor 13 through cables 14 and 15, calculates measured values input from each, and displays numerical values on a display 21 and 22.

3 is the recording system, which includes transducers and sensors,
The information signal from the counter system 2 is recorded by connecting it to a recorder, thereby automatically recording and writing a data chart. Additionally, the signal output from the recorder can be input to a floppy IC card by connecting it to a computer. 4
The pipe housing 1, counter system 2, and recording system 3 are each removably housed in the frame, allowing the whole to be configured into a compact unit and placed in different locations as needed. .

[Effects of the Invention] Since the present invention is configured as described above, the flow rate can be measured without using any member exposed from the outside of the measurement pipe into the pipe.
It is possible to measure the flow rate of high-pressure soil hardening material, etc., which is a high-speed fluid with a high degree of wear, on the discharge side of the high-pressure pump P, and the flow rate measurement range is 4001/n+in, and the pressure measurement range is 800.
Enables measurement up to kg/c+J.

In addition, accurate numerical values can be obtained through measurement on the discharge side that responds immediately to the actual situation, and pressure can also be measured at the same time, making it possible to perform reliable injection and create a stable hardened layer through unified numerical control. The measurement target is cement slurry,
Wide range of applications including air mortar, mortar, sludge, lime water, chemical plant slurry, mine drainage, and human waste. Furthermore, since the unit is configured to be detachable, measurement, calculation, and recording can be conveniently arranged according to the situation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a front view of the entire unitized unit, Fig. 2 is an overall explanatory view showing the installation situation of the device, and Fig. 3 is an explanation showing the inside of the pipe housing. In the figures, A is a side sectional view and B is a longitudinal sectional view. FIG. 4 is an explanatory diagram showing the state of reflection of ultrasonic waves in the case of a single-head transducer, and FIG. 5 is an explanatory diagram showing the state of reflection of ultrasound waves in the case of a single-head transducer. 1~Pipe housing 11~Measuring tube 12~Transducer 13~Pressure sensor 14.15~Cable 2~Counter system 21.22~Display display 3~Recording system 4~Frame A~Transmission element B~
Receiving element P ~ High pressure pump D ~ High pressure pump discharge side S
~ Suction side W ~ Curing material injection device Patent applicant Suzuki Partial Figure 4 Figure r

Claims (4)

[Claims] (1) A transducer with a molded ultrasonic transmitting element and a receiving element is glued to the wall of the high-pressure pump discharge pipe that pumps soil hardening material, etc., and transmits ultrasonic waves to eliminate air bubbles and slurry in the fluid. , or a method for measuring the flow rate of high-pressure soil hardening materials, etc., which is characterized by reflecting it on a pressure boundary surface and receiving it, and measuring the flow rate of the pumped fluid based on the difference between the frequencies of transmission and reception. (2) A flow rate measuring device for high-pressure soil hardening materials, etc., consisting of a transducer with molded ultrasonic transmitting and receiving elements connected to a counter system by cable. (3) Claim (2) states that a housing is provided through which a pressure-feeding pipe for measurement fluid passes, and a transducer in which an ultrasonic transmitting element and a receiving element are molded, and a pressure measurement sensor are disposed inside the housing. Flow measurement device for high-pressure soil hardening materials, etc. (4) Claim (2) characterized in that the pipe housing, the counter system, and the recording system are connected and made into a unit by a frame body in which these are removably housed.
Flow rate measuring device for high-pressure ground hardening materials, etc.