JP2019052445A - Boring machine - Google Patents

Abstract

To provide a boring machine capable of transmitting and receiving a position detection signal by using an existing drilling pipe and a hollow tube and without a communication wire.SOLUTION: A boring machine 1 for digging the ground G by using a drilling pipe 2 having a drilling blade at its tip and advancing a drilling pipe 2 into the underground, comprises: a first communication unit 28 for wirelessly transmitting a position detection signal of a position in the underground of the drilling pipe 2; a plurality of hollow tubes 3 which is connected to the rear end of the drilling pipe 2 and in which a hollow portion constitutes a signal transmission line for wireless transmission; an arithmetic unit 7 having a second communication unit 71 for receiving a position detection signal sent through the signal transmission line and executing an operation for obtaining the current position of the drilling pipe 2 from the position detection signal received by the second communication unit 71; and a relay pipe 4 connected to at least one place between the drilling pipe 2 and the subsequent hollow tube 3 and between the hollow tube 3 and the subsequent hollow tube 3. The relay pipe 4 is provided with a relay device 48 that relays a position detection signal sent to the second communication device 71 through the signal transmission line.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a drilling device for excavating the ground with a drilling pipe having a drilling blade at the tip and allowing the drilling pipe to enter the ground.

  Conventionally, a boring method for excavating the ground is known. Boring method is, for example, to perform a curved excavation diagonally from the ground surface to the lower part of the building, and then perform a straight excavation by changing the direction in the horizontal direction, to inject the chemical solution below the building A hole or a hole for inserting a communication line is formed.

  A drilling apparatus used for this type of boring method includes a drilling pipe having a drilling blade at the tip, a hollow pipe sequentially connected to the rear end side of the drilling pipe, and a boring machine installed on the ground. The hollow pipe and the drilling pipe are propelled into the ground with a boring machine. A sensor for measuring the position of the excavation pipe in the ground is attached to the excavation pipe. The position detection signal of the sensor is transmitted to a calculation device installed on the ground, and the position of the excavation pipe is calculated based on the position detection signal.

  As a method for transmitting a position detection signal from a sensor to an arithmetic device, for example, a method described in Patent Document 1 is known. In the drilling device of Patent Document 1, the hollow tube is configured as a double tube including a unit tube and a protective tube provided inside the unit tube, and a communication line is provided between the unit tube and the protective tube. The position detection signal is transmitted and received using this communication line.

JP2013-7241A

  However, in the thing of the cited reference 1 mentioned above, since the signal is transmitted / received using the communication line, there exists a possibility of a disconnection. In addition, there is a problem that a hollow tube that is a double tube needs to be specially manufactured, and an existing hollow tube cannot be used.

  The present invention has been made paying attention to the above problems, and an object thereof is to provide a drilling device capable of transmitting and receiving a position detection signal using an existing drilling pipe and a hollow pipe without using a communication line.

  The excavation apparatus according to the present invention excavates the ground with an excavation pipe having an excavation blade at the tip, and allows the excavation pipe to enter the ground. The excavation apparatus includes a sensor for detecting a position of the excavation pipe in the ground provided in the excavation pipe, a first communication device that is provided in the excavation pipe and wirelessly transmits a position detection signal by the sensor, A plurality of hollow pipes connected to the rear end portion of the excavation pipe according to the depth of penetration of the excavation pipe into the ground, and the hollow portion constituting the signal transmission path for the wireless transmission, An arithmetic device having a second communicator that receives a position detection signal sent through the signal transmission path, and executing a calculation for obtaining the current position of the excavated pipe from the position detection signal received by the second communicator And a relay pipe connected to at least one place between the excavation pipe and the subsequent hollow pipe and between the hollow pipe and the subsequent hollow pipe. The relay pipe is provided with a relay device that relays the position detection signal sent through the signal transmission path toward the second communication device.

  The position detection signal from the sensor provided in the excavation pipe is transmitted from the first communication device to the second communication device through the hollow portion of the hollow tube via the relay device. The arithmetic unit obtains the current position of the excavated pipe based on the position detection signal received by the second communication device.

  According to said structure, since it transmits by radio | wireless between the 1st communication apparatus and the 2nd communication apparatus, a disconnection accident does not arise. Further, it is not necessary to use a double pipe for passing a communication line as in the prior art, and an existing hollow pipe can be used. Furthermore, when performing communication by radio, there is a risk that the communication accuracy may decrease, but it is located at least at one place between the excavation pipe and the subsequent hollow pipe and between the hollow pipe and the subsequent hollow pipe. Since the relay device that relays the detection signal is provided, signal transmission / reception can be reliably performed between the first communication device and the second communication device without lowering the communication accuracy.

  It is preferable that the first communication device and the second communication device perform wireless communication by a wireless method compliant with a predetermined short-range wireless communication standard.

  The wireless communication is preferably performed by a wireless system compliant with any of Wi-Fi (registered trademark), Bluetooth (registered trademark), and ZigBee (registered trademark), and more preferably performed by a wireless system compliant with ZigBee. Is called.

  In one embodiment of the present invention, the relay pipe is composed of first and second pipes that are hollow inside. The first pipe includes a front end connection portion in which the excavation pipe or the hollow tube is fitted in a front end portion, and a rear end connection portion in which the front end portion of the second pipe is fitted in a rear end portion. The second tube has a front end connection portion in which the rear end connection portion of the first tube is fitted in a front end portion, and a rear end connection in which a front end portion of the subsequent hollow tube is fitted in a rear end portion. A part. The relay device is held between a step formed inside the first pipe and a front end connection part of the second pipe.

  The relay device is preferably embedded in a ring-shaped synthetic resin molding.

  By forming the synthetic resin molding in conformity with the inner diameter of the relay pipe, the relay device can be securely held inside the relay pipe. Moreover, even when excavating water through the hollow part of the hollow pipe or the relay pipe or when excavated earth and sand enters the hollow part of the relay pipe, the relay apparatus is protected without being submerged.

  In a preferred embodiment, the relay device includes an antenna that projects outward from the synthetic resin molded body.

  Since the antenna protrudes into the hollow portion of the relay pipe, the position detection signal is easily transmitted through the relay pipe and the hollow pipe. In particular, when the relay pipe or the hollow pipe is made of metal and a step portion is formed on the inner peripheral surface, if the antenna is provided at a position that does not protrude inward from the step portion, transmission of the position detection signal is possible. Although it may be blocked by the stepped portion, the position detection signal is easily transmitted through the inside of the relay tube or the hollow tube by projecting the antenna inside the stepped portion inside the hollow portion of the relay tube.

  In one embodiment of the present invention, it further comprises a connecting tube connected to the rear end of the hollow tube at the end, and the connecting tube has a front end connecting portion in which the hollow tube is fitted to a front end portion; A rear end connection portion fitted with a connection portion of a rotation propulsion mechanism of a boring machine for allowing the excavation pipe to enter the ground at a rear end portion, and a step portion formed inside the connection pipe and the boring machine The relay device is held between the connection unit.

  The boring machine is installed on the ground, and the position detection signal transmitted through the hollow tube is transmitted to the second communication device via the relay device for the connecting tube located on the ground. Since the relay device for the connecting pipe is located on the ground, the position detection signal can be reliably transmitted to the second communication device arranged on the ground without being affected by the ground.

  According to the present invention, since the transmission is performed wirelessly between the first communication device and the second communication device, no disconnection accident occurs, and the position detection signal from the sensor using the existing hollow tube Can be sent. In addition, since the relay device is interposed, signals can be transmitted and received between the first communication device and the second communication device without reducing the communication accuracy.

1 is a schematic diagram illustrating an overall configuration of an excavator according to an embodiment of the present invention. It is sectional drawing in alignment with the length direction of a drilling pipe. It is sectional drawing which follows the length direction of a hollow tube. It is sectional drawing which follows the length direction of a relay pipe. It is sectional drawing which follows the length direction of a connecting pipe.

(Overall configuration of the drilling rig)
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an overall configuration of an excavator 1 according to an embodiment of the present invention. The excavator 1 is used, for example, for installing a drain pipe, a water pipe, a gas pipe, a underground pipe through which a cable such as a communication line or a power line passes, a chemical injection pipe, and the like in the ground G.

  The excavation apparatus 1 excavates the ground G with an excavation pipe 2 having an excavation blade at the tip, and causes the excavation pipe 2 to enter the ground. The excavation apparatus 1 includes an excavation pipe 2, a plurality of hollow pipes 3 connected to the rear end of the excavation pipe 2 by the number corresponding to the depth of penetration of the excavation pipe 2 into the ground, the excavation pipe 2, and the subsequent Are connected to the rear end of the rearmost hollow tube 3 and the relay tube 4 connected to at least one point between the hollow tubes 3 and between the hollow tube 3 and the subsequent hollow tube 3. , A position detected by a sensor 25 for detecting the position of the excavation pipe 2 in the ground, and a boring machine 6 for allowing the hollow pipe 3, the excavation pipe 2 and the relay pipe 4 to enter the ground. Based on the detection signal, a calculation device 7 is provided for executing a calculation for obtaining the current position of the excavated pipe 2. In the illustrated embodiment, the relay tubes 4 are connected to the rear ends of the hollow tubes 3, but the relay tubes 4 are not necessarily connected to the rear ends of all the hollow tubes 3.

(Configuration of drilling pipe)
As shown in FIG. 2, the excavation pipe 2 has a main body pipe 23 that is hollow inside, and a tapered bid 21 having a pressure receiving surface 21 a that is inclined with respect to the axial direction is provided at the tip of the main body pipe 23. . A wide diameter portion 24 is formed at the center of the main body tube 23 in the length direction. The wide diameter portion 24 includes an outer tube 23a and an inner tube 23b. The inner diameter of the main tube 23 is equal to the inner diameter of the inner tube 23b, and the inner peripheral surface of the main tube 23 and the inner peripheral surface of the inner tube 23b are aligned. ing. A sensor 25 for detecting the position of the excavation pipe 2 in the ground is provided between the outer pipe 23a and the inner pipe 23b. The sensor 25 is, for example, an acceleration sensor, a gyroscope, or the like, and measures the pitch angle, yaw angle, and roll angle of the drill pipe 2. Hereinafter, detection signals of these angles by the sensor 25 are referred to as “position detection signals”. The sensor 25 is incorporated in a control board (not shown) fixed to the outer peripheral surface of the inner tube 23b.

  A ring-shaped synthetic resin molded body 27 is held on the inner peripheral surface of the rear end portion of the outer tube 23a. The synthetic resin molded body 27 is made of, for example, a polyamide resin such as nylon, but the material is not limited to this. Moreover, the synthetic resin molding 27 may not be a perfect ring shape, and a part may be cut off. A first communication device 28 is embedded in the synthetic resin molded body 27. The first communication device 28 is connected to the sensor 25 by a signal line or wirelessly, receives a position detection signal from the sensor 25, and wirelessly transmits it to a second communication device 71 described later. The first communication device 28 includes an antenna 29 for performing wireless communication, a wireless communication unit (not shown), a control unit, a memory, and the like. The antenna 29 is substantially L-shaped and protrudes from the synthetic resin molded body 27 into the hollow. When the step portion is formed on the inner peripheral surface of the main tube 23, the antenna 29 is provided so as to protrude inward from the step portion. The shape of the antenna 29 is not limited to the L shape, and may be an I shape or may be embedded in the synthetic resin molded body 27. The shape and form of the antenna 29 are selected according to the communication performance of the first communication device 28, the second communication device 71, and the relay devices 48 and 58.

  The main body tube 23 includes a rear end connection portion 22 into which the front end connection portions 31 and 41 of the subsequent hollow tube 3 or the relay tube 4 are fitted. In FIG. 2, the hollow tube 3 is connected to the rear end connection portion 22. The inner diameter of the rear end connection portion 22 is formed to be slightly larger than the outer diameter of the front end connection portions 31 and 41 of the subsequent hollow tube 3 or the relay tube 4. A screw portion (not shown) is formed on the inner peripheral surface of the rear end connection portion 22, and this screw portion and the outer peripheral surfaces of the front end connection portions 31 and 41 of the subsequent hollow tube 3 or relay tube 4 are formed. The excavated pipe 2 is connected to the subsequent hollow pipe 3 or the relay pipe 4 by screwing the formed screw portion (not shown). The front ends 31b and 41b of the front end connection portions 31 and 41 abut against the front end of the inner peripheral surface of the rear end connection portion 22 when connecting to the front end connection portions 31 and 41 of the subsequent hollow tube 3 or the relay tube 4. A step portion 22a is formed.

  In the present embodiment, the inner peripheral surface of the main body pipe 23 of the excavation pipe 2, the inner peripheral surface of the inner pipe 23a, the inner peripheral surface of the synthetic resin molded body 27, and the front end of the subsequent hollow pipe 3 or relay pipe 4 The inner peripheral surfaces of the connecting portions 31 and 41 are aligned. The length of the excavation pipe 2 visible from the outside is about 150 cm in the present embodiment, but is not limited to this length.

(Configuration of hollow tube)
FIG. 3 is a cross-sectional view along the length direction of the hollow tube 3. In FIG. 3, the relay pipe 4 is connected to the front end and the rear end of the hollow pipe 3. The hollow tube 3 forms a signal transmission path for wirelessly transmitting a signal from the first communication device 28 in the hollow portion. As shown in FIG. 3, the hollow tube 3 has a front end fitted into the rear end connecting portions 22, 32, 42 of any one of the excavation tube 2, the front hollow tube 3, and the relay tube 4 at the front end. A connection unit 31 is provided. A screw portion (not shown) is formed on the outer peripheral surface of the front end connection portion 31 to be screwed with the screw portion of the rear end connection portion 22 of the excavation pipe 2, the front hollow tube 3, or the relay pipe 4. ing. Furthermore, the rear end connection portions 22, 32, 32 are connected to the outer peripheral surface of the front end connection portion 31 when the excavation pipe 2, the front hollow tube 3, and the rear end connection portions 22, 32, 42 of the relay pipe 4 are connected. A step portion 31a with which the rear ends 22b, 32b, 42b of 42 abut is formed.

  Further, the hollow tube 3 has a rear end connection portion 32 into which any of the front end connection portions 31, 41, 51 of the subsequent hollow tube 3, the relay tube 4, and the connecting tube 5 is fitted inside at the rear end portion. I have. In FIG. 3, the relay pipe 4 is connected to the rear end connection portion 32. The inner diameter of the rear end connection portion 32 is slightly larger than the outer diameter of the front end connection portions 31 and 41 of the subsequent hollow tube 3 or relay tube 4. A screw portion (not shown) is formed on the inner peripheral surface of the rear end connection portion 32, and this screw portion and the outer peripheral surfaces of the front end connection portions 31 and 41 of the subsequent hollow tube 3 or relay tube 4 are formed. The formed threaded portion (not shown) is screwed to connect the hollow tube 3 to any one of the subsequent hollow tube 3, the relay tube 4, and the connecting tube 5. At the front end of the inner peripheral surface of the rear end connection portion 32, the front end connection portion 31, when connected to any of the front end connection portions 31, 41, 51 of the subsequent hollow tube 3, the relay tube 4, and the connecting tube 5, A stepped portion 32a is formed on which the tips 31b, 41b, 51b of 41, 51 abut.

  In a state where the subsequent hollow tube 3, the relay tube 4, and the connecting tube 5 are connected to the rear end of the hollow tube 3, the inner peripheral surface of the hollow tube 3, the subsequent hollow tube 3, the relay tube 4, The inner peripheral surfaces of the connecting pipe 5 and the front end connecting portions 31, 41, 51 are aligned. The length of the hollow tube 3 visible from the outside is about 300 cm in this embodiment, but is not limited to this length.

(Construction of relay pipe)
FIG. 4 is a cross-sectional view along the length direction of the relay pipe 4. In FIG. 4, the hollow tube 3 is connected to the front end and the rear end of the relay tube 4. The relay pipe 4 includes first and second pipes 45 and 46 that are hollow inside. The first tube 45 includes a front end connection portion 41 at a front end portion and a rear end connection portion 43 at a rear end portion. The front end connection portion 41 is fitted inside the rear end connection portions 22 and 32 of the front excavation pipe 2 or the hollow tube 3, and the front end connection portion 44 of the second pipe 46 is fitted inside the rear end connection portion 43. . On the outer peripheral surface of the front end connection portion 41, a screw portion (not shown) that is screwed with the screw portions of the rear end connection portions 22 and 32 of the front excavation pipe 2 or the hollow tube 3 is formed. Furthermore, the rear end connection portions 22 and 32 have rear end portions 22b and 32b on the outer peripheral surface of the front end connection portion 41 when connected to the rear end connection portions 22 and 32 of the front excavation pipe 2 or the hollow tube 3; A stepped portion 41a that abuts is formed.

  The inner diameter of the rear end connection portion 43 of the first tube 45 is formed to be slightly larger than the outer diameter of the front end connection portion 44 of the second tube 46. A screw portion (not shown) is formed on the inner peripheral surface of the rear end connection portion 43, and this screw portion and a screw portion formed on the outer peripheral surface of the front end connection portion 44 of the second tube 46 (see FIG. The first tube 45 is connected to the second tube 46 by being screwed together.

  The inner diameter of the rear end portion of the first tube 45 is formed larger than the inner diameter of the front end portion, and a step portion 45a is formed by the difference in inner diameter in the vicinity of the central portion in the length direction.

  A ring-shaped synthetic resin molded body 47 is held between the step 45 a on the inner peripheral surface of the first tube 45 and the tip 44 b of the front end connection portion 44 of the second tube 46. Since the configuration of the synthetic resin molded body 47 is the same as the configuration of the synthetic resin molded body 27, description thereof is omitted. A relay device 48 is embedded in the synthetic resin molded body 47. The relay device 48 receives a position detection signal sent from the first communication device 28 or the front-side relay device 48 via the signal transmission path, and transmits it to the second communication device 71. The relay device 48 includes an antenna 49 for performing wireless communication, a wireless communication unit (not shown), a control unit, a memory, and the like. Since the configuration of the antenna 49 is the same as the configuration of the antenna 29 of the first communication device 28, description thereof is omitted.

  The second tube 46 has a front end connecting portion 44 fitted into the rear end connecting portion 43 of the first tube 45 at the front end portion, and a rear end fitting the front end connecting portion 31 of the subsequent hollow tube 3 into the rear end portion. The connection part 42 is provided. On the outer peripheral surface of the front end connection portion 44, a screw portion (not shown) that is screwed with the screw portion of the rear end connection portion 43 of the first tube 45 is formed. Further, a stepped portion 44 a is formed on the outer peripheral surface of the front end connection portion 44 so that the rear end 43 b of the rear end connection portion 43 comes into contact with the rear end connection portion 43 of the first pipe 45.

  The inner diameter of the rear end connection portion 42 is formed to be slightly larger than the outer diameter of the front end connection portion 31 of the subsequent hollow tube 3. A screw portion (not shown) is formed on the inner peripheral surface of the rear end connection portion 42, and the screw portion and the screw portion of the front end connection portion 31 of the subsequent hollow tube 3 are screwed together. The relay pipe 4 is connected to the subsequent hollow pipe 3. At the front end of the rear end connection portion 42, a step portion 42 a is formed on which the front end 31 b of the front end connection portion 31 of the subsequent hollow tube 3 abuts.

With the hollow tube 3 connected to the rear end of the relay tube 4, the inner peripheral surface of the front end connecting portion 41 of the first tube 45, the inner peripheral surface of the synthetic resin molded body 47, and the front end of the second tube 46 The inner peripheral surface of the connecting portion 44 and the inner peripheral surface of the front end connecting portion 31 of the subsequent hollow tube 3 are aligned.
Although the length of the relay pipe 4 visible from the outside is about 50 cm in this embodiment, it is not limited to this length. The relay pipe 4 may be connected to the rear ends of all the hollow pipes 3, but a predetermined number of hollow pipes depending on the communication status between the first communication device 28 and the second communication device 71. You may connect every 3 and you may connect only between the predetermined | prescribed hollow tube 3 and the subsequent hollow tube 3. FIG.

(Composition of connecting pipe)
FIG. 5 is a cross-sectional view taken along the length direction of the connecting pipe 5. The connecting pipe 5 includes a front end connecting portion 51 fitted into the hollow tube 3 at the front end portion, and a rear end connecting portion 52 fitted with the connection portion 61 of the rotation propulsion mechanism 62 of the boring machine 6 at the rear end portion. ing. A step portion 5 a is formed on the inner peripheral surface of the connecting pipe 5, and a ring-shaped synthetic resin molded body 57 is held between the step portion 5 a and the tip 61 b of the connection portion 61 of the boring machine 6. The structure of the other connecting pipe 5 is the same as the structure of the first pipe 45 of the relay pipe 4, and the front end connecting portion 51, the stepped portion 51a, the rear end connecting portion 52, the tip 52b, the stepped portion 5a, The configuration of the synthetic resin molding 57, the relay device 58, and the antenna 59 includes the front end connection portion 41, the step portion 41a, the rear end connection portion 43, the tip end 43a, the step portion 45a, and the synthetic resin of the first tube 45 of the relay tube 4. Since it corresponds to the configuration of the molded body 47, the relay device 48, and the antenna 49, description thereof is omitted.
With the connecting portion 61 of the boring machine 6 connected to the rear end of the connecting tube 5, the inner peripheral surface of the front end connecting portion 51 of the connecting tube 5, the inner peripheral surface of the synthetic resin molded body 57, and the inner periphery of the connecting portion 61. The faces are aligned.
The length of the connecting pipe 5 visible from the outside is about 350 cm in the present embodiment, but is not limited to this length. Further, the connecting pipe 5 is not necessarily used, and the hollow pipe 3 may be directly connected to the connecting portion 61 of the boring machine 6.

(Boring machine configuration)
For example, as shown in FIG. 1, the boring machine 6 is provided with a rotation propulsion mechanism 62 in the base machine. The rotation propulsion mechanism 62 includes a rotation drive motor 64 and an elevating device 63 that moves the rotation drive motor 64 up and down. I have. The rotation drive motor 64 is coaxially connected to the connection pipe 5 via the connection portion 61, and the excavation pipe 2, the hollow pipe 3, the relay pipe 4, and the connection pipe 5 are connected by the raising / lowering and rotation of the rotation drive motor 64. Rotate and enter the ground. As shown in FIG. 5, a screw portion (not shown) is formed on the outer peripheral surface of the connection portion 61, and a step portion 61 a with which the rear end 52 b of the connecting tube 5 abuts is formed. Has been.

  In this embodiment, the main body pipe 23, the outer pipe 23a, the inner pipe 23b, the taper bid 21, the hollow pipe 3, the relay pipe 4, and the connecting pipe 5 of the excavating pipe 2 are made of metal such as steel. Thereby, the position detection signal transmitted from the first communication device 28 is shielded from the outside of the excavation pipe 2, the hollow pipe 3, the relay pipe 4 and the connection pipe 5, and the excavation pipe 2, the hollow pipe 3 and the relay pipe are shielded. 4. It is transmitted through the inside of the connecting pipe 5. In addition, the material which comprises the excavation pipe 2, the hollow pipe 3, the relay pipe 4, and the connection pipe 5 is not limited to steel, For example, it may be made of synthetic resins, such as vinyl chloride and nylon.

(Configuration of arithmetic unit)
The arithmetic device 7 receives the position detection signal sent through the signal transmission path, and calculates the current position of the excavated pipe 2 from the position detection signal received by the second communication device 71. An arithmetic unit to be executed is provided. Moreover, you may provide the display part which displays a calculation result. The second communication device 71 includes an antenna, a transmission / reception unit, a control unit, a memory, and the like for performing wireless communication with the relay device of the connection pipe 5. The calculation unit is a computer such as a personal computer provided with a CPU constituting a control unit and a memory constituting a storage unit, for example. The CPU and memory of the personal computer may also serve as the control unit and memory of the second communication device 71. The arithmetic unit 7 is arranged in the vicinity of the ground boring machine 6. In the present embodiment, the second communication device 71 is wirelessly connected to the relay device of the connecting pipe 5, but may be connected by wire. The second communication device 71 may be accommodated in the case together with the calculation unit, or may be disposed at a position away from the calculation unit. Further, the arithmetic device 7 may be provided integrally with the boring machine 6.

  The wireless communication between the first communication device 28 and the second communication device 71 is performed by a wireless method compliant with any of Wi-Fi (registered trademark), Bluetooth (registered trademark), and ZigBee (registered trademark). More preferably, it is performed by a wireless system compliant with ZigBee. ZigBee is advantageous in that standby power during sleep is smaller than Wi-Fi and Bluetooth (registered trademark), and the rise time from sleep is short.

(Boring method and excavation pipe position detection method)
Next, the boring method using the excavator 1 of this embodiment will be described. First, the boring machine 6 is arranged in the vicinity of the excavation position on the ground G. Then, the connecting pipe 5 is connected to the connecting part 61 of the rotation propulsion mechanism 62 of the boring machine 6, and the rear end connecting part 22 of the excavating pipe 2 is connected to the front end connecting part 51 of the connecting pipe 5. Next, the excavation pipe 2 is inserted into the ground G by rotational propulsion. This propulsion is performed by lowering the rotation drive motor 64 of the boring machine 6. When the excavation pipe 2 is inserted halfway into the ground G, the hollow pipe 3 is connected between the excavation pipe 2 and the connecting pipe 5, and the excavation pipe 2 and the hollow pipe 3 are inserted into the ground G. When the hollow tube 3 is inserted halfway into the ground G, the relay pipe 4 is connected between the excavating pipe 2 and the connecting pipe 5, and the excavating pipe 2, the hollow pipe 3 and the relay pipe 4 are inserted into the ground G. Go. Thereafter, the hollow tube 3 and the relay tube 4 are sequentially connected and propelled to the ground G. In the present embodiment, the relay tube 4 is connected to the rear end of the hollow tube 3 for each hollow tube 3, but the relay tubes 4 are not necessarily connected to the rear ends of all the hollow tubes 3.

  Each time the excavation pipe 2 is propelled by a predetermined distance, for example, every 1 m, the driving of the rotary propulsion mechanism 62 is stopped and the position of the excavation pipe 2 is measured by the sensor 25. The position detection signal detected by the sensor 25 is transmitted from the first communication device 28 to the second communication device 71 via the relay device 48 of the relay pipe 4 and the relay device 58 of the connecting pipe 5. At this time, the position detection signal is transmitted through the relay pipe 4 and the hollow pipe 3. The arithmetic unit 7 detects the position of the excavation pipe 2 using the position detection signal received by the second communication device 71, and obtains the excavation locus of the excavation pipe 2 from this detection position. The operator adjusts the direction of the pressure receiving surface 21a of the taber bid 21 of the excavating pipe 2, the rotational speed of the rotary drive motor 64, the lowering of the rotary drive motor 64, etc. as needed so that the excavation trajectory matches the planned trajectory.

  According to said structure, since the position detection signal by the sensor 25 of the excavation pipe 2 is transmitted to the arithmetic unit 7 on the ground without using a signal line, the disconnection accident of the signal line does not occur. . In wireless transmission, the signal strength may be reduced and communication may become unstable. However, a relay device 48 is provided between the existing hollow tubes 3 or between the excavating tube 2 and the hollow tube 3. By arranging the relay pipe 4, the position detection signal can be reliably transmitted to the arithmetic device 7 using the existing excavation pipe 2 and the hollow pipe 3. Further, the excavation pipe 2, the hollow pipe 3, and the relay pipe 4 are made of a metal such as steel, so that the position detection signal is grounded by using the hollow portions of the excavation pipe 2, the hollow pipe 3, and the relay pipe 4 as signal transmission paths. To the arithmetic unit 7.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning of this invention.

  In the present embodiment, the hollow pipe 3 is connected to the excavation pipe 2, but the relay pipe 4 may be connected to the excavation pipe 2, and in this case, the screw portion of the rear end connection portion 22 of the excavation pipe 2 is By screwing the threaded portion of the front end connection portion 41 of the relay tube 4, the subsequent hollow tube 3 is fitted into the relay tube 4 and connected. At this time, the rear end 22b of the rear end connection part 22 of the excavation pipe 2 hits the step 41a of the front end connection part 41 of the relay pipe 4, and the front end of the relay pipe 4 hits the step 22a of the rear end connection part 22 of the excavation pipe 2 The tip 41b of the connecting portion 41 comes into contact.

  Further, the hollow tube 3 may be connected to the rear end of the hollow tube 3 without using the relay tube 4. In this case, the screw portion of the rear end connection portion 32 of the hollow tube 3 is connected to the subsequent hollow tube 3. 3, the subsequent hollow tube 3 is fitted into and connected to the front hollow tube 3. At this time, the rear end 32 b of the rear end connection portion 32 of the front hollow tube 3 hits the step portion 31 a of the front end connection portion 31 of the subsequent hollow tube 3, and the rear end connection portion 32 of the front hollow tube 3. The front end 31b of the front end connection portion 31 of the subsequent hollow tube 3 abuts the step 32a.

  For example, in this embodiment, the rear end connection portions 22, 32, and 42 of the tubes 2, 3, and 4 and the front end connection portions 31, 41, and 51 of the tubes 3, 4, and 5 are fixed by screws. However, the present invention is not limited to this. For example, the inner diameters of the rear end connection portions 22, 32, 42 of the tubes 2, 3, 4 and the outer diameters of the front end connection portions 31, 41, 51 of the tubes 3, 4, 5 are formed substantially the same. 2, 3, 4 When the front end connection portions 31, 41, 51 of the tubes 3, 4, 5 are fitted inside the rear end connection portions 22, 32, 42, the front ends of the tubes 3, 4, 5 The outer peripheral surfaces of the connecting portions 31, 41, 51 are closely fitted to the inner peripheral surfaces of the rear end connecting portions 22, 32, 42 of the tubes 2, 3, 4, so that the rear end connecting portions 22 of the respective tubes are caused by friction. , 32, 42 and the front end connecting portions 31, 41, 51 of each pipe may be fixed. Further, the rear end connecting portions 22, 32, 42 of the tubes 2, 3, 4 and the front ends of the tubes 3, 4, 5 are provided by providing a locking projection or a locking recess that allows the locking pin to pass therethrough. The connection parts 31, 41, 51 may be fixed.

  In the present embodiment, the front end connection portions 31, 41, 51 of the respective tubes 3, 4, 5 are fitted inside the rear end connection portions 22, 32, 42 of the respective tubes 2, 3, 4, The inner diameters of the rear end connection portions 22, 32, 42 of the respective tubes 2, 3, 4 are made smaller than the outer diameters of the front end connection portions 31, 41, 51 of the respective tubes 3, 4, 5, and the respective tubes 3, 4, The rear end connection portions 22, 32, and 42 of the respective pipes 2, 3, and 4 may be fitted inside the five front end connection portions 31, 41, and 51.

DESCRIPTION OF SYMBOLS 1 Excavator 2 Excavating pipe 21 Taper-bid 22 Rear end connection part 25 Sensors 27, 47, 57 Synthetic resin molding 28 First communication device 29 Antenna 3 Hollow pipe 31 Front end connection part 32 Rear end connection part 4 Relay pipe 45 First tube 41 First tube front end connection portion 43 First tube rear end connection portion 46 Second tube 44 Second tube front end connection portion 42 Second tube rear end connection portion 48, 58 Relay device 49, 59 Antenna 5 Connecting pipe 51 Front end connection portion 6 Boring machine 61 Connection portion 62 Rotation propulsion mechanism 7 Arithmetic device 71 Second communication device

Claims (6)

In a drilling device for excavating the ground with a drilling pipe having a drilling blade at the tip and entering the drilling pipe into the ground,
A sensor for detecting a position of the excavation pipe in the ground provided in the excavation pipe;
A first communicator that is provided in the excavation pipe and wirelessly transmits a position detection signal from the sensor;
A plurality of hollow pipes connected to the rear end portion of the excavation pipe according to the depth of penetration of the excavation pipe into the ground, and the inside of the hollow part constituting the signal transmission path for the wireless transmission,
An operation having a second communicator for receiving a position detection signal sent through the signal transmission path, and executing an operation for obtaining the current position of the excavation pipe from the position detection signal received by the second communication device Equipment,
A relay pipe connected between at least one place between the excavation pipe and the subsequent hollow pipe and between the hollow pipe and the subsequent hollow pipe;
The excavation apparatus provided with the relay apparatus which relays the position detection signal sent to the said signal transmission path toward the said 2nd communication apparatus in the said relay pipe.   2. The excavator according to claim 1, wherein the first communication device and the second communication device perform wireless communication by a wireless method compliant with a predetermined short-range wireless communication standard. The relay pipe is composed of first and second pipes that are hollow inside,
The first pipe includes a front end connection part in which the excavation pipe or the hollow pipe is fitted in a front end part, and a rear end connection part in which a front end part of a second pipe is fitted in a rear end part,
The second tube has a front end connection portion in which the rear end connection portion of the first tube is fitted in a front end portion, and a rear end connection in which a front end portion of the subsequent hollow tube is fitted in a rear end portion. With
The excavation device according to claim 1, wherein the relay device is held between a step portion formed inside the first tube and a front end connection portion of the second tube.   The excavator according to claim 1 or 3, wherein the relay device is embedded in a ring-shaped synthetic resin molded body.   The excavator according to claim 4, wherein the relay device includes an antenna that protrudes outward from the synthetic resin molded body. A connecting pipe connected to a rear end of the hollow pipe at the tail end;
The connecting pipe has a front end connection portion in which the hollow tube is fitted into a front end portion, and a rear end connection in which a connection portion of a rotation propulsion mechanism of a boring machine that causes the excavation pipe to enter the ground at the rear end portion. With
The excavation device according to claim 1, wherein the relay device is held between a step portion formed inside the connection pipe and a connection portion of the boring machine.