JPH02252813A - Measurement of crushing range and its device in blast injection work process - Google Patents

Abstract

PURPOSE:To improve measuring accuracy and simplify a device by rotatably blasting water or a bentonite liquid at the time of construction or after construction of blast injection construction, and determining an inner diameter of an excavation hole from an oscillation wave and a receiving wave generated. CONSTITUTION:When measuring is made at the time of construction of blast injection construction, a blast device 13 is attached to a lower end part of an underwater monitor 2, and installed at given depth of a guide hole 1. When measuring is conducted after the construction, the device 13 is attached to a lower end part of a rod, and installed in the bottom of a crushing hole 21. And concurrently with the rotation of the device 13, a pump 9 is actuated, and water or a bentonite liquid is blasted from high pressure and low pressure nozzles. Moreover an ultrasonic wave is oscillated from an ultrasonic transceiver 8, and a reflection wave from its crushing hole 21 wall is received. The inner diameter of the crushing hole 21 can be measured with a ground instrument based on these oscillation and receiving waves.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application ¥f] The present invention relates to a method and apparatus for measuring a fracture range in an injection injection method.

[Conventional technology] Measuring the fracture range of the ground and rock during construction using the injection injection method is one of the basic technologies for controlling the quality of the finished columnar solids and improving the efficiency of the construction method.

For this reason, when excavating underground continuous walls or cast-in-place piles, the fracture range is usually measured by reflecting ultrasonic waves in the bentonite liquid, and this is reflected in construction management.

[Problem to be solved by the invention] However, when the concentration of cement particles or soil particles is extremely high, as in the case of injection injection method, even if the ultrasonic waves are transmitted, they are attenuated. Therefore, it is necessary to increase the output of the ultrasonic waves, use a parabolic antenna to efficiently catch reflected waves, use the scooking method, or improve the accuracy of the obtained data. Technological development regarding processing methods, etc. is progressing. However, further research is required to put it into practical use, and the device is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for measuring a fracture range in an injection injection method with good measurement accuracy and a simple structure.

[Findings] When ultrasonic waves are sent into a multi-layered jet of bentonite liquid or water, and the waves reflected from the wall are received as they propagate through the same jet, the attenuation of the ultrasonic waves is extremely small and clear data can be obtained. The present invention was made based on this knowledge, and the measuring device is relatively simple.

[Means for Solving the Problems] According to the present invention, during or after the injection injection method,
Water or bentonite liquid is rotated injected, ultrasonic waves are oscillated in the jet, the reflected waves of the oscillated waves from the borehole wall are received, and the inner diameter of the borehole is determined from these oscillated waves and received waves. A method for measuring the fracture range in the injection injection method is provided.

Further, according to the present invention, there is provided a nozzle that injects high-pressure water or bentonite liquid, an ultrasonic transducer surrounded by a protective cylinder at the center back of the nozzle, and a transducer connected to the ground. A device for measuring a crushing range in an injection injection method, characterized in that it is provided with a transmission/reception cable, a pump for pumping water or bentonite liquid to the nozzle, a data transmitter/receiver, an ultrasonic oscillator, and a data recorder. provided.

It is preferable that the nozzle is composed of a central high-pressure nozzle and an annular low-pressure nozzle provided around the high-pressure nozzle, and that both of these nozzles and an ultrasonic transducer constitute an injection device.

In addition, when the measurement is performed during the construction of the injection injection method, the injection device is attached to the lower end of an underwater monitor using known technology and installed at a predetermined depth of the guide hole, and when the measurement is performed after the construction of the injection method, the injection device is installed at the lower end of the rod. It is preferable to attach it to the hole and install it at the bottom of the crushing hole.

[Function] In the method and device for measuring the crushing range in the injection injection method configured as described above, the injection device is rotated, the pump is activated to inject water or bentonite liquid from both nozzles, and ultrasonic wave transmission and reception is performed. An ultrasonic wave device emits ultrasonic waves and the reflected waves from the walls of the fracture hole are received, and based on these oscillated waves and received waves, the inner diameter of the fracture hole is measured by equipment installed on the ground.

At this time, the ultrasonic waves are protected from the influence of the nozzle jet by the protective cylinder, and are propagated through the nozzle jet and reflected, so attenuation is extremely small and accurate measurement values can be obtained.

Therefore, since clear records can be obtained by transmitting and receiving high-frequency ultrasound waves, reading errors are small.

In addition, accurate data can be obtained even in ground where the difference in acoustic impedance is extremely small, such as between slurry and earth.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an apparatus for implementing the invention.

In the figure, a triple tube 3 and a triple tube swivel 4 are sequentially connected above an underwater monitor 2 inserted into a guide hole 1 at a predetermined depth. The triple tube 3 is rotatably supported by a support device 5, and the triple tube swivel 4 is suspended by a crane 6. By moving the triple tube swivel 4 up and down by the crane 6, the underwater monitor 2 is moved up and down. It has become so. The triple pipe swivel 4 is connected to a grout pump, a compressor, and a high-pressure water pump (not shown).

The measuring device includes an injection device 13 provided at the lower end of the underwater monitor 2 and equipped with an ultrasonic transducer 18 (described later), a transmitting/receiving cable 7 connected to the ultrasonic transducer 18, and a lower part of the support device 5. a data transmitter/receiver 8 installed on the ground and connected to a transmitting/receiving cable 7, a pump 9 that sends water or bentonite liquid to an injection device 13 installed on the ground, and a wireless transmitter/receiver 10.
, an ultrasonic oscillator 11 and a data recorder 12.

In FIGS. 2 and 3, the injection device 13 is provided with a low-pressure nozzle 14 that injects low-pressure water or bentonite liquid in an annular shape around a high-pressure nozzle 14 that injects high-pressure water or bentonite liquid, respectively. It is connected by hoses 16,17 to a pump 19 on the ground.

An ultrasonic transducer 1 is located deep in the center of the high-pressure nozzle 14.
8 is provided, and its surroundings are covered with a protective tube 19 to prevent the influence of high-pressure jets of water or bentonite liquid. This ultrasonic transducer 18 is connected to a data transceiver 8 via a transmitting/receiving cable 7.

There are two types of measurement: a method in which measurement is performed in real time during the construction of an injection method such as a column jet method, and a method in which measurement is performed after the construction of the method, and the present invention can be carried out in either case.

FIGS. 4(a) and 4(b) show embodiments of real-time implementation.

First, to the construction depth that is the target of construction, for example, a diameter of 15 mm.
(Drill a guide hole 1 of about 1 m (Fig. 4(a)).

Next, the underwater monitor 2 with the injection device 13 installed at its lower end is installed at a predetermined depth (FIG. 4(b)).

Next, the column jet 20 is injected from the underwater monitor 2 to crush the ground, and the nozzle 14 of the injection device 13 is injected.
From step 15 onwards, the water source oscillates ultrasonic waves from the ultrasonic transducer 18 while injecting bentonite liquid, and processes the oscillated waves and the reflected waves from the hole wall of the crushing hole 21 with equipment 10 to 12 on the ground. , measure the inner diameter of the crushing hole 21 (Fig. 3(C)),
At this time, even in a slurry with large suspended particles and high viscosity of the injection material such as cement milk in the column jet method, the ultrasonic waves carried on the jet of water or bentonite liquid have very little attenuation and are extremely accurate. data can be obtained.

The fifth (!I(a) to c) shows a mode in which construction and measurement are performed with a time lag.

First, after completing the injection injection method such as the column jet method,
The construction machine 22, etc. is removed (Fig. 5(a)) Next, the injection device 13 is attached to the lower end of the rod 23, and installed at the bottom of the crushing hole 21 filled with slurry 24 such as cement milk. Figure (b)).

Next, the rod 23 is rotated to operate the pump 9 on the ground, and the ultrasonic transducer 18 emits ultrasonic waves to measure the inner diameter of the borehole 21 in the same manner as described above (FIG. 5(c)).
).

[Effect of the invention] Since the present invention is configured as explained above,
This produces the effects described below.

When performing injection injection methods such as the column jet method, ultrasonic wave attenuation is extremely low even in slurry with large suspended particles such as cement milk as the injection material and high viscosity, resulting in extremely accurate data.

can be obtained.

In addition, depending on the type of ground, for example, water jets or bentonite liquid jets, which are the propagation paths of ultrasonic oscillation waves and reflected waves, can be applied to non-collapsible cohesive soil or collapsible sandy soil. It can be used with a jet stream.

In addition, accurate data can be obtained even during construction on ground where the difference in acoustic impedance is extremely small, such as between slurry and earth.

Additionally, accurate data can be obtained both during and after construction.

In addition, since the work can be carried out in the entire area of the ground, it is possible to economically use injection materials such as cement milk, improve the ground accurately in the planned area, and improve construction efficiency.

In addition, the nozzle is configured as a double nozzle consisting of a high-speed nozzle in the center and a low-speed annular nozzle (if necessary, a multiple nozzle with three or more layers) to increase the effective flying distance of the central jet.
Even in high viscosity slurries exceeding 000 centipoise,
It is possible to perform measurements up to a range of about m.

In addition to the injection injection method, it can also be applied to the bottom of a hole in a cast-in-place pile, where the suspended particles are large and the apparent specific gravity is large.

In addition, since the ultrasonic oscillator is installed inside the nozzle,
The structure is simple.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an example of an apparatus for implementing the present invention, Fig. 2 is a side sectional view showing an injection device, Fig. 3 is a view taken in the direction of arrow A in Fig. 2, and Fig. 4 (a) is not shown. Figure 5 (a) to (C) are route diagrams showing a mode in which construction and measurement are carried out with a time lag. 7... Transmission/reception cable 8... Ultrasonic transceiver 9... Pump 10... Wireless transceiver 1
1... Ultrasonic oscillator 12... Data recorder
13... Injection device 14... High pressure nozzle 15.
...Low pressure nozzle 18...Ultrasonic transducer 19...
・Protection f! J 21... Fracture hole 2 Figure IA Figure 3 Figure 1

Claims (2)

[Claims] (1) During or after construction of the injection injection method, water or bentonite liquid is rotated and ultrasonic waves are oscillated in the jet,
A method for measuring a fracture range in an injection injection method, characterized by receiving reflected waves of the oscillation waves from the borehole wall, and determining the inner diameter of the borehole from these oscillation waves and the received waves. (2) A nozzle that injects high-pressure water or bentonite liquid, an ultrasonic transducer surrounded by a protective tube at the center of the nozzle, and a transmission/reception cable that connects the transducer to the ground. An apparatus for measuring a fracture range in an injection injection method, comprising: a pump for pumping water or bentonite liquid to the nozzle; a data transmitter/receiver; an ultrasonic oscillator; and a data recorder.