JP2857781B2 - Road surface cutter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter device for cutting asphalt, concrete and the like on a road surface, and in particular, to a road device while preventing damage to a pipe buried under the road surface. The present invention relates to a road surface cutter device capable of cutting a surface.

When laying communication cables, conduits, and the like along a road surface, an operation of cutting a pavement roadbed on the road surface with a cutter or the like is required. At this time, if gas pipes, water pipes, power pipes, communication cable pipes, etc. buried underground are in the shallow layer where the cutter blade can reach, accidents may occur in which these pipes are cut or damaged. . For this reason, the location of buried pipes has been surveyed in advance, but the conventional means for checking buried pipes mainly uses electromagnetic induction.If this method is used, the detection target is limited to metal pipes. Excavation has been performed by hand excavation for reasons such as the fact that there is a problem in measurement accuracy due to the influence of surrounding metal objects. However, such pre-position confirmation and manual excavation work are a major obstacle to improving the efficiency of construction work.Therefore, a road surface cutter device that can cut the road surface while accurately grasping the underground buried objects is desired. It is rare.

[Conventional technology]

To date, the following techniques have been proposed as means for preventing damage to pipes buried underground when cutting a road surface with a cutter device.

Search lever method (FIG. 7) In this technique, a search lever 72 is provided at the tip of a cutter blade 71, and the resistance when the search lever 72 contacts a pipe 76 buried under a road surface 77 is represented by an electric signal. The signal is amplified by an amplifier 73 and input to a signal analysis unit 74. The signal is detected to detect a pipe, and the cutter blade rotation driving unit 75 is stopped. An apparatus for detecting a buried object of an excavator having the above functions is proposed by the present applicant as Japanese Utility Model Laid-Open No. 58-54473.

Magnetic field detection method using stray current (Fig. 8) In this technique, two electromagnetic induction sensors 82 and 83 for reception are mounted in front of a cutter blade 81 and are buried under a road surface 89 by a stray current in the soil. Receiving a magnetic field (induction magnetic field) 88 induced from the buried pipe 80 and converting the received signal to an amplifier 84
The signal is amplified by the filter circuit 85, and the signal obtained from the electromagnetic induction sensors 82 and 83 is compared by the comparator 86. When the buried pipe 80 is detected, the cutter blade rotation drive unit 87 stops cutting the buried pipe 80. . A cutter device with a metal buried object detector having the above functions is proposed by the present applicant as Japanese Utility Model Laid-Open No. 3-72905.

Electromagnetic wave transmission / reception method (FIG. 9) In this technique, an electromagnetic wave generated by an electromagnetic wave generation circuit 92 is emitted from a transmission antenna 91 toward the underground 97 and hits an object 98 such as a buried pipe having different electrical characteristics. Utilizing the fact that radio waves are reflected therefrom, the reflected wave is received by the receiving antenna 93, sampled and captured by the sampling device 94, the reflected wave is processed by the waveform analyzer 95, and the reflected wave is transmitted to the underground 97. An object 98 is displayed on the display device 96 on a screen.

[Problems to be solved by the invention]

However, each of the above techniques has the following problems.

Search lever method (Fig. 7) If the moving speed of the cutter device increases, there is a risk that the resistance of the search lever 72 may not be detected,
It is difficult to increase the detection distance of the metal tube by increasing 72.

Magnetic field detection method using stray current (Fig. 8) The stray current in the soil is not constant depending on the location.
There is a problem that the magnetic field excited by the sensor cannot be received by the sensors 82 and 83.

Electromagnetic wave transmission / reception method (FIG. 9) Since the purpose is mainly to detect a buried pipe existing in a deep part, an antenna unit for transmitting / receiving electromagnetic waves must be large. In addition, the main body for analyzing and displaying the reflected wave is large and heavy, and furthermore, the antenna and the main body are connected by a cord, so that there is a problem in workability such as a limited working range.

The present invention has been made to solve the above-mentioned problems of the prior art, and does not limit the detection target, and detects a buried pipe without being affected by environmental conditions, and cuts a road pavement by civil engineering work. It is an object of the present invention to improve the work efficiency by preventing the accident of cutting the buried pipe.

[Means for solving the problem]

FIG. 1 (a) shows a configuration of a first embodiment of a road surface cutting cutter device of the present invention which achieves the above object. The apparatus according to the first embodiment includes a cutter blade driving means 9 for rotating the cutter blade 1 for cutting a road surface, and an electromagnetic wave provided in the vicinity of the road surface and moving downward along the road surface in conjunction with the cutter blade driving means 9. , A transmitting antenna 2 for applying a pulse signal to the transmitting antenna 2, a receiving antenna 4 for receiving a reflected wave of an electromagnetic wave from an object buried under a road surface, and a received reflected wave. And a display section 6 for displaying the obtained underground cross-sectional pattern.

The apparatus according to the second embodiment of the present invention includes a cutter blade driving unit 9 that rotates the cutter blade 1 that cuts a road surface,
A transmission / reception antenna 7 provided near the road surface, capable of emitting electromagnetic waves downwardly of the road surface in conjunction with the cutter blade driving means 9 and capable of receiving reflected waves of electromagnetic waves from objects buried under the road surface; A transmission / reception switch 8 for switching the connection destination of the transmission / reception antenna 7; an electromagnetic wave generating means 3 for applying a pulse signal to the transmission / reception antenna 7 via the switch 8; And a display means 6 for displaying the obtained underground cross-sectional pattern.

[Action]

ADVANTAGE OF THE INVENTION According to the road surface cutting cutter device of this invention, the miniaturized antenna part is provided in front of a cutter part, an electromagnetic wave is radiated into the ground through a transmission antenna, and a buried pipe exists in a shallow underground part. Sometimes the electromagnetic waves from this buried pipe are received by a receiving antenna. The received electromagnetic waves are analyzed, the reflected waves from the buried pipe are displayed on a small display unit, and the buried pipe can be detected based on the image pattern of the buried pipe.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a cutter device for cutting a road surface according to an embodiment of the present invention.
20 shows the configuration of 20. A cutter blade 11 is provided on the road surface 13 side of the cutter body 10 of the cutter device 20, and the rotation of the cutter blade 11 is controlled by the cutter blade drive circuit 2. Note that a power supply for supplying power to the cutter blade drive circuit 12 is not shown in this drawing. A transmission / reception antenna unit 30 is provided in front of the cutter blade 11, and a transmission antenna 21 and a reception antenna 27 are provided inside the antenna unit 30. These transmitting antenna 21 and receiving antenna 27
Are connected to a sampling device 26 via an electromagnetic wave generating circuit 22 and a receiving circuit 26, respectively. Electromagnetic wave generation circuit
22 generates a pulse wave, sends it to the transmitting antenna 21 and emits it, and the signal received by the receiving circuit 26 is a sampling device every 1 cm or 2 cm depending on the moving distance of the antenna.
A section pattern calculation circuit 24 connected to the sampling device 23 creates an underground section observation pattern from the sampled reception waveform sampled at 23 and collected for a specified moving distance. The underground section observation pattern thus obtained is displayed on the screen of the display device 25 according to the intensity.

In addition, in order to prevent reflection at the near end of the antenna unit 30, the cutter body 10 side is blocked by an electromagnetic wave absorbing material 29, and wheels 28 are provided on the bottom surface of the antenna unit 30.
The wheels 28 are made of a dielectric material that is well connected to the ground surface, thereby improving operability. The transmitting / receiving antenna section 30 is provided with a rubber dielectric 34 for blocking electromagnetic waves around its bottom in order to prevent the electromagnetic waves from leaking outside, and furthermore, the antenna 21 is installed horizontally on the ground. Two switches 31 are provided on a diagonal line on the bottom surface of the antenna unit 30 so that an electromagnetic wave can be generated and transmitted only when the switch is turned on.

FIG. 3 is a bottom view of the antenna section 30 of FIG. 2 as viewed from the bottom side. In this figure, the shape of the transmitting antenna element 32 used for the transmitting antenna 21 and the shape of the receiving antenna element 33 used for the receiving antenna 27 are shown. In this embodiment, the shape of the transmitting antenna element 32 and the receiving antenna element 33 is a bow-tie type. Although the size of the antenna elements 32 and 33 is set to a size that can be mounted on the cutter device, since the detection depth depends on the size of the antenna, the target of the detection depth is set to 40 cm, and a size corresponding to this is set. For example, the length of one side is about 15 cm.
Also, from this figure, the positions and shapes of the electromagnetic wave absorbing material 29, the wheel 28, the rubber dielectric 34 for blocking electromagnetic waves, and the switch 31 can be confirmed.

Next, the operation of the road surface cutting cutter device configured as described above will be described. When the cutter device 10 starts operating, a pulse wave is generated by the electromagnetic wave generation circuit 22 in conjunction with the operation, and the electromagnetic wave is emitted from the antenna element 32 of the transmitting antenna 21 toward the ground. This transmitted wave is represented by the symbol S
Indicated by When the buried pipe 40 exists under the ground, the transmitted wave S
Is reflected by the buried pipe 40 having a different dielectric constant, but the reflected wave R reflected by the buried pipe 40 returns from the ground and is received by the receiving antenna 27 here. The received electromagnetic wave passes through the receiving circuit 26, and 1 cm or 2 cm depending on the moving distance of the antenna
The sampling is performed by the sampling device 23 every time. Then, when the sampled reception waveforms are aggregated for the designated moving distance, the underground cross-section observation pattern is calculated by the cross-section pattern calculation circuit 24 from the sampled reception waveform. The obtained underground section observation pattern is displayed on the screen of the display device 25 according to the intensity. The operator of the cutter device determines the presence or absence of a buried pipe on the basis of the shape of the reflected wave displayed on the screen.

4 (a) to 4 (c) show reflected waves from the buried pipe which are displayed as images on the display device 25 using this apparatus. The reflected wave from the buried pipe shown in (a) to (c) in FIG.
This is the reflection pattern when a 75mm steel pipe is buried in the position of.
Buried pipes generally include metal pipes, PVC pipes, fume pipes, pottery pipes, etc., but the electric field strength of the reflected wave is the strongest when it is from a metal object. Attenuation becomes large and detection becomes difficult. However, when the embedding position is about 40 cm, the amount of attenuation is small, so that it is possible to receive the reflected wave without distinction depending on the type of tube. In addition, the pattern mainly appears in a crescent shape, a half crescent shape, and an oval shape as shown in FIGS.

Therefore, based on the shape of the reflected waves from these buried pipes, the operator can check the waveforms obtained by actual measurement and stop the cutter when they match these waveforms to prevent accidents in cutting the buried pipes. it can.

FIG. 5 shows the configuration of another embodiment of the road surface cutting cutter device of the present invention. The same components as those in the embodiment of FIG. 2 are denoted by the same reference numerals and description thereof is omitted. .

The difference between the embodiment of FIG. 5 and the embodiment of FIG.
The transmitting antenna 21 and the receiving antenna 27 shown in the figure are integrated as a transmitting / receiving antenna 35, and the transmitting circuit and the receiving wave are switched by the switching circuit 36, thereby reducing the size of the antenna unit 30. Therefore, the antenna unit 30 shown in FIG.
The transmitting antenna element 32 and the receiving antenna element 33 in FIG.

Also in this device, an electromagnetic wave is generated by the electromagnetic wave generation circuit 22 in order to emit an electromagnetic wave from the antenna, and from the element 34 of the transmission / reception integrated antenna 35 which is in the transmission state by the transmission / reception switching circuit 36 provided on the way, The electromagnetic waves are emitted as transmission waves S toward the ground. This transmitted wave S is an object such as an underground pipe with a different dielectric constant.
The reflected wave R reflected at 40 and emitted from the buried tube 40 is received by the transmission / reception integrated antenna element 34.

At this time, the transmission / reception switching circuit 36 set to a time that does not coincide with the transmission timing of the electromagnetic wave generated by the electromagnetic wave generation circuit 22 is in the reception state. The received electromagnetic waves pass through the receiving circuit 26, and are appropriately sampled by the sampling device 23 every 1 cm or 2 cm depending on the moving distance of the antenna. The work proceeds while repeating this operation. Next, the underground cross-section observation pattern obtained by the cross-section pattern calculation circuit 24 from the received waveform is displayed on the screen of the display device 25 according to the intensity. When the presence of the buried pipe is confirmed based on the shape of the reflected wave displayed on the screen, the operator can immediately stop the cutter blade 11 for cutting the road surface, thereby preventing the accident of cutting the buried pipe.

The rest of the configuration is exactly the same as that of the apparatus shown in FIG. 2, and further description will be omitted.

As described above, the road surface cutter apparatus according to the present invention can prevent an accident such as accidentally cutting a buried pipe that has occurred during a road surface cutting operation. Until now, the target of detection was only metal pipes, but expanded to other than metal pipes such as PVC pipes and concrete pipes, it is also effective for various buried pipes in shallow layers. In addition, witnesses and the like are required for this kind of road surface cutting work, but it can be expected to reduce the number of workers on the operation side and contribute to improvement of work efficiency.

〔The invention's effect〕

As described above, according to the road surface cutting device of the present invention, the position of the object buried underground in front of the cutter blade can be confirmed not only for the metal pipe but also for the buried pipe other than the metal pipe. Therefore, there is an excellent effect that it is possible to prevent a cutting accident of a buried pipeline which occurs at the time of excavation work on a road surface while saving manpower.

[Brief description of the drawings]

1 (a) and 1 (b) are diagrams showing the principle of the construction of a road surface cutting device according to the present invention, FIG. 2 is a diagram showing the structure of a road surface cutting device according to an embodiment of the present invention, and FIG. 4 is an explanatory view showing an example of a pattern of a reflected wave from a buried pipe displayed on the display device of FIG. 2, and FIG. 5 is a road surface of another embodiment of the present invention. FIG. 6 is a bottom view of the antenna unit of FIG. 5, FIG. 7 is a configuration diagram of a conventional cutter device with an embedded object detection device having a search lever, and FIG. FIG. 9 is a configuration diagram of a cutter device provided with a metal buried object detector using stray current, and FIG. 9 is a configuration diagram of a face detection device provided with a transmitter / receiver for ultrasonic waves and electromagnetic waves. 1,11 ... cutter blade, 2,21 ... transmitting antenna, 3 ... electromagnetic wave generating means, 4,27 ... receiving antenna, 5 ... section pattern calculating means, 6 ... display means, 7,35 ... Transmission / reception antenna, 8: transmission / reception selector switch, 9: cutter blade driving means, 10: cutter device, 12: cutter blade driving unit, 20: cutter device for cutting the road surface of the present invention, 22: electromagnetic wave Generating circuit, 23 Sampling device, 24 Cross-section pattern calculation circuit, 25 Display device, 26 Receiving circuit, 28 Wheel, 29 Electromagnetic wave absorbing material, 30 Transmitting antenna 31 Switch 32, a transmitting antenna element, 33, a receiving antenna element, 34, a dielectric for blocking electromagnetic waves, 35, a transmitting and receiving integrated antenna element, 36, a transmitting and receiving switching circuit.

Continuing from the front page (72) Inventor Mitsumasa Hishiyama 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Sadao Kawano 1-16-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Stock In-company (58) Field surveyed (Int.Cl. ⁶ , DB name) E01C 23/09 G01V 3/12

Claims (2)

(57) [Claims] 1. A cutter blade driving means (9) for rotating a cutter blade (1) for cutting a road surface, and provided in the vicinity of a road surface and interlocked with the cutter blade driving means (9) and directed downward under the road surface. (2) a transmitting antenna for emitting electromagnetic waves, an electromagnetic wave generating means (3) for applying a pulse signal to the transmitting antenna (2), and a receiving unit for receiving a reflected wave of an electromagnetic wave from an object buried under a road surface. An antenna (4), a cross-section pattern calculating means (5) for obtaining an underground cross-sectional pattern from a received reflected wave, and a display means (6) for displaying the obtained underground cross-sectional pattern. Road cutting cutter device. 2. A cutter blade driving means (9) for rotating a cutter blade (1) for cutting a road surface, and provided below the road surface and interlocked with the cutter blade driving means (9) and directed downward below the road surface. Can emit electromagnetic waves,
A transmission / reception antenna (7) capable of receiving a reflected wave of an electromagnetic wave from an object buried under the road surface; a transmission for switching a connection destination of the transmission / reception antenna (7);
A reception changeover switch (8), an electromagnetic wave generating means (3) for applying a pulse signal to the transmission / reception antenna (7) via the changeover switch (8), and an underground section from a reflected wave received through the changeover switch (8) A road surface cutting device comprising: a cross-sectional pattern calculating means (5) for obtaining a pattern; and a display means (6) for displaying the obtained underground cross-sectional pattern.