JP2829845B2 - Cavity detector outside the underground pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to air sinuses spacecraft you search a cavity occurring outside the underground pipes, such as sewer pipes.

[0002]

2. Description of the Related Art If a cavity is formed around the outside of a sewage pipe buried in the ground, there is a danger that the surface of the sewage pipe will collapse, and rocks, etc. will fall in the cavities and cause serious damage to the sewage pipe. There is also. Therefore, when burying a sewer pipe, work will be carried out so as not to create a cavity around the outside, but groundwater from the connection part of the sewer pipe or a crack generated in the sewer pipe, or the connection part of the mounting pipe, If the groundwater infiltrates, the surrounding soil and sand will flow out into the pipe with the infiltration of the groundwater, and even if the amount of groundwater leakage is small, a large cavity will be formed at the leakage location for a long time. Therefore, it is necessary to perform exploration of the cavity outside the sewer pipe at an appropriate time or periodically, and perform a repair operation to fill the cavity based on the exploration result. As an exploration method, a radar exploration method is employed in which electromagnetic waves are transmitted from the ground to the ground using an exploration vehicle, and a cavity is explored based on the time required until reception of a reflected wave from a sewer pipe.

[0003]

The radar exploration method searches for a cavity based on the difference in the propagation speed of electromagnetic waves depending on the presence or absence of a cavity. However, if groundwater is accumulated in the cavity, the propagation speed of the electromagnetic wave is reduced. Since there is almost no difference from the case where there is no pit, it is often impossible to determine the presence or absence of a cavity when the sewer pipe is buried below the groundwater level. Further, when electromagnetic waves are transmitted underground, unnecessary reflections are extremely large, and accurate detection may not be possible due to these unnecessary reflections. Since the transmission of strong electromagnetic waves is often restricted by radio regulations, the radar search method is unsuitable for the exploration around sewer pipes buried deep.

[0004] The present invention therein, the underground pipe outside can be reliably exploration cavities deeper occurring outside underground pipe
And an object thereof is to provide a cavity spacecraft for use in air-dong exploration methods.

[0005]

In the present invention, there is provided a means for solving], bombard the underground pipe, you explore the cavity of the outer ground tube by measuring the vibration generated in the ground line by the impact. Shock is as long as it gives a vibration in the ground tube (many underground pipe surface) ground tube, etc. When granting or if vibration wave applying mechanical shock to. The impact causes vibrations in the underground pipe, and the form of the vibration depends on the presence or absence of a cavity at the location of the impact. Therefore, by measuring the vibration generated in the underground pipe, the presence / absence and position of the cavity can be grasped. Then, when groundwater is accumulated in the cavity or not, soil and sand etc. are deposited thinly on the outer surface of the underground pipe, and when there is a cavity outside the underground pipe, soil and sand etc. are not deposited Even in such cases, since the shape of the vibration is different, it is possible to determine these items from the measurement results.

A cavity detector outside the underground pipe according to the present invention is provided with a moving body moving in the underground pipe, an impact device provided on the moving body for applying an impact to the underground pipe, and an impact device provided by the impact apparatus. and it includes a vibration sensor for measuring the vibration generated in the ground tube and by the impact. When the moving body stops at an appropriate position, the impact device operates , and the vibration generated in the underground pipe is measured by the vibration sensor. By repeating this work, cavities are surveyed over the entire length of the underground pipes, but cavities often occur at leak locations, so they are often used at the connections of sewage pipes, cracks in sewage pipes, or connections of attachment pipes. The search position may be limited. As a vibration sensor, a contact-type sensor such as a pickup is often used, but a non-contact high-sensitivity receiver is sometimes used.

[0007] The moving body is provided with a drilling device for drilling a hole in the underground pipe, and a repair device for injecting a filler such as concrete into the cavity from the hole drilled by the drilling device . When a cavity is formed, a repair operation for filling the cavity is necessary. However, by performing the repair operation at the same time as the exploration operation, the work efficiency can be improved.

[0008] Preferably, the moving body is provided with a confirming means inserted into the cavity through a hole formed by the drilling device in order to grasp the size of the cavity. In order to inject the filler into the cavity without excess or shortage, it is necessary to accurately grasp the size of the cavity. As a confirmation means, a television camera is often used, but a means for measuring a cavity volume such as an ultrasonic sensor may be used in some cases.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a state in which a cavity detector outside an underground pipe according to the present invention is disposed in a sewer pipe.

The cavity detector 1 includes a hammer device 7 (impact device), a vibration sensor device 9, a perforation device 11, a television camera device 13, and a repair device 15 on a moving body 5 having a caterpillar 3 in order from the front. It is inserted into the sewer pipe B from the manhole A, and moves in the sewer pipe B in the direction of arrow C (toward the downstream manhole D). The cavity probe 1 has a power / signal cable 17 and a hose cable 19.
The power / signal cable 17 and the hose cable 19 pass through the manhole A and extend to the ground. The power supply / signal cable 17 is drawn into the observation vehicle 21 arranged on the ground, supplies power to the cavity detector 1, transmits a detection signal from the vibration sensor device 9, and inputs the signal to a personal computer (not shown). In addition, a video signal is transmitted to display a photographing result of the television camera device 13 on a monitor (not shown). The hose cable 19 extends into a control device 23 located on the ground, and is connected to an air compressor (not shown), a hydraulic pump (not shown), and a filler supply device (not shown).

FIG. 2 is a diagram showing details of the cavity detector 1.

The hammer device 7 includes a cylinder 2 having an upper opening and a piston rod 27 of a cylinder 25 provided on the moving body 5.
9, an iron hammer 33 having a sealing ring 31 on its outer periphery is housed in the cylindrical body 29 so as to be able to move up and down in a gas-tight manner, and a disk-shaped upper end of the cylindrical body 29 is provided. A protective rubber disk 35 is attached so as to close the opening. The cylinder 25 operates by hydraulic pressure from a hydraulic pump in the control device 23 (see FIG. 1), and the iron hammer 33 operates by air pressure from an air compressor in the control device 23. Air pressure is supplied into the cylindrical body 29 from a supply hose 36 housed in the hose cable 19. The vibration sensor device 9 includes a compression coil spring 4 at the tip of a piston rod 39 of a cylinder 37 provided on the moving body 5.
1, a piezoelectric pickup 43 (vibration sensor) is attached, and the cylinder 37 is operated by hydraulic pressure from a hydraulic pump. Then, the drilling device 11 is provided with a piston rod 47 of a cylinder 45 provided on the moving body 5.
A motor 49 is attached to the output shaft 51 of the motor 49.
And a diamond wheel 53 having a diameter of about 50 mm and having a conical tip portion is fixed, and the cylinder 45 is operated by hydraulic pressure from a hydraulic pump. The television camera device 13 has a television camera 59 (confirmation means) fixed to a piston rod 57 of an actuator 55 provided on the moving body 5. The actuator 55 is actuated by hydraulic pressure from a hydraulic pump to operate the piston rod 57. Is extended and retracted. Further, the repairing device 15 is a device in which an ejector 65 having a larger diameter than the diamond wheel 53 is fixed to a piston rod 63 of a cylinder 61 provided on the moving body 5, and the cylinder 61 is operated by hydraulic pressure from a hydraulic pump to eject The device 65 ejects the filler supplied from the filler supply device in the control device 23 from the ejection port 66.

A drill may be used in place of the diamond wheel.

FIG. 3 is a diagram for explaining the process of searching for a cavity.

When the cavity detector 1 (see FIG. 2) stops at the search position, the piston rod 39 of the cylinder 37 extends and presses the pickup 43 against the inner wall of the sewer pipe B. The pickup 43 of the vibration sensor device 9 includes the compression coil spring 4
Due to the contraction of 1, it comes into contact with the inner wall with an appropriate pressing force. Next, until the piston rod 27 of the cylinder 25 extends and the upper end approaches the inner wall, the cylindrical body 2 of the hammer device 7 is moved.
9 (FIG. 3a). Then, compressed air is supplied from a supply hose 36 through a supply port 67, and the iron hammer 33 supported by the sheet 69 collides with the inner wall of the sewer pipe B via the protective rubber disc 35.
Is raised (FIG. 3b). Since the air vent 71 is provided at the upper end of the cylindrical body 29, the iron hammer 33 smoothly rises inside the cylindrical body 29. The pickup 43 measures the vibration generated in the sewer pipe B due to the collision of the iron hammer 33. Although the supply of compressed air is performed only for a short time, the iron hammer 33 instantaneously descends after the collision and moves away from the inner wall (an intermediate portion of the cylindrical body 29 (the iron hammer 33 that has collided with the inner wall).
An air vent 73 is also provided at a lower position.
When the supply of the compressed air is stopped, the iron hammer 33 descends until it is supported by the sheet 69, the piston rods 27 and 39 of the cylinders 25 and 37 contract, and the cylindrical body 29 and the pickup 43 descend (FIG. 3C).

FIG. 4 is a view for explaining the process of repairing the cavity.

When it is confirmed from the detection signal from the pickup 43 that the cavity E is generated, the cavity probe 1
(See FIG. 2) moves slightly forward and stops. And
With the operation of the motor 49 of the drilling device 11, the cylinder 45
The piston rod 47 extends to press the diamond wheel 53 against the inner wall of the drain pipe B, and a hole F is made in the inner wall (FIG. 4A). Thereafter, when the piston rod 47 of the cylinder 45 contracts and the diamond wheel 53 descends, the cavity detector 1 moves a little forward again and stops.
Then, the piston rod 57 of the actuator 55 extends to insert the television camera 59 into the cavity E from the hole F. The inserted television camera 59 has a piston rod 57.
Rotates along with the rotation of, and photographs the entire cavity E (FIG. 4B). When the piston rod 57 of the actuator 55 contracts and the television camera 59 descends, the cavity detector 1 moves a little further forward and stops. Thereafter, the ejector 65 is brought into contact with the inner wall of the sewer pipe B such that the piston rod 63 of the cylinder 61 extends and the ejection port 66 enters the hole F. The ejector 65 injects the amount of the suspension-type filler corresponding to the size of the cavity E grasped by the video signal from the television camera 59 of the television camera device 13 into the cavity E from the ejection port 66 (FIG. 4c). After the suspended filler is in a semi-cured state, the piston rod 63 of the cylinder 61
Contracts and the ejector 65 of the repair device 15 descends, and the repair work is completed.

[0019]

As described above, the underground pipe of the present invention
The cavity explorer on the side has a simple configuration but is effectively empty.
It can explore a cave.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a cavity detector outside an underground pipe according to the present invention is disposed in a sewer pipe.

FIG. 2 is a diagram showing details of a cavity detector.

FIG. 3 is a diagram illustrating a process of searching for a cavity.

FIG. 4 is a diagram illustrating a process of repairing a cavity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cavity detector 5 Moving body 7 Hammer device (impact device) 11 Drilling device 15 Repair device 43 Pickup (vibration sensor) 59 TV camera (confirmation means) B Sewer pipe (underground pipe) E Cavity

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01V 1/00 F16L 55/00 G01N 29/26 G01N 29/12

Claims (2)

(57) [Claims] 1. A moving body moving in an underground pipe, and the moving body
An impact device that impacts the underground pipe provided on the body,
Vibration generated in underground pipe by impact applied from impact device
And a vibration sensor for measuring the following, wherein the moving body further comprises a perforation device for perforating an underground pipe,
Filler into the cavity from the hole made by this drilling device
And a repair device for injecting.
A cavity probe outside the underground pipe. 2. The moving body ascertains the size of a cavity.
For this purpose, the hole drilled by the punch
Claims characterized by comprising a confirmation means to be inserted
Item 2. A cavity explorer outside the underground pipe according to Item 1 .