JPH0270890A - Wireless position sensor for soil propulsion drill - Google Patents

Abstract

PURPOSE:To improve the workability of a propulsive pipe by providing a position sensor sensing the attitude position of a soil propulsion drill, a signal processor digitially encoding an attitude-position signal and a transmission coil for data transmission transmitting data over a reception means. CONSTITUTION:A position sensor 10 transmitting the positional information of a soil propulsion drill in a wireless manner is loaded on the section of the inner circumferential surface of a propulsive outer pipe 6. A data reception coil 21 as a reception means receiving the positional information is installed to a ground section 1. A transmission coil 14 for sensing a position sending nose positional information and a position sensing transmitter 15 for driving the coil 14 are mounted to the position sensor 10. The transmission coil 14 for sensing the position is supplied with AC currents by the position sensing transmitter 15, a magnetic field generated from the transmission coil 14 for sensing the position is applied to a data reception coil 21, and the magnetic field strength is detected, thus measuring the propulsive position of the soil propulsion drill. Accordingly, the workability of the connection of the propulsive pipe is improved, thus shortening the workhours of connection.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention is directed to excavating piping for communication cables, water and sewage systems, gas, etc. under roads, etc. Regarding wireless position detection devices used for underground propulsion drilling machines that are installed without cables, the signal cable for transmitting position signals of the underground propulsion drilling machines is eliminated to reduce the complexity of cable connections and simplify the device. This is what I did.

(Prior art) As a conventional technology for detecting the position of an underground propulsion drilling machine, for example, when the propulsion line of the underground propulsion drilling machine is a straight line, laser and transit are used to detect the position of the underground propulsion drilling machine from the starting shaft. There is a system that performs measurements by visually observing a target mounted on a vehicle. However, this conventional technique cannot be measured in the case of curved propulsion.

For this reason, as another conventional technology when accompanied by curved propulsion,
There are some methods that perform position detection measurements using methods such as gyros, bending angle integration, and magnetic fields. This measurement method using a gyro, bending angle integral, magnetic field, etc. is a signal transmission from the position detection device at the tip of the underground propulsion drilling machine to the starting shaft side through the propulsion pipe in order to transmit the information from the position detection sensor to the ground. I needed a cable for it.

FIG. 4 shows a position detection device among such conventional techniques, which determines the position of an underground propulsion drilling machine by determining n1 of the propulsion position using a magnetic field and measuring its attitude angle. In the figure, 31 is an underground propulsion drilling machine, 32 is a transmitting coil built into its tip, 33 is an angle detector for the underground propulsion drilling machine, and on the other hand, a receiving coil 35 and a measuring device 3 are located above the ground.
6 and an operation panel 37 are installed, and the angle detector 33 and the operation panel 37 are connected to the angle detection data transmission cable 3.
Connected by 4.

The propulsion position is measured by the magnetic field by generating an alternating current magnetic field towards the ground from the transmitting coil 32 built into the tip of the underground propulsion drilling machine 31, and by using the receiving coil 35 installed on the ground.
This is done by receiving the magnetic lines of force 38 and displaying the intensity of the induced voltage generated in the receiving coil 35 on a measuring device 36. In addition, the attitude angle is measured by displaying the angle signal of the soil propulsion drilling machine on the operation panel 37 on the ground part via the angle detection data transmission cable 34 by the soil propulsion drilling machine angle detector 33. The position of the underground propulsion drilling machine 31 is measured using the following steps.

(Problems to be Solved by the Invention) In the conventional position detection technology for underground propulsion drilling machines, in order to transmit the angle detection information of the position detection device mounted on the underground propulsion drilling machine to the ground part, it is necessary to Because it was necessary to send information to the ground level via the launch shaft, a signal cable was installed inside the propulsion pipe. For this reason, when connecting the propulsion pipe in the starting shaft, connection work for the signal cable is required, which significantly reduces workability. In addition, poor contact may occur at connection points between signal cables, and as the propulsion length of the underground propulsion drilling machine increases, the number of connection points increases, leading to a further decline in reliability. was there.

Since the signal cable is placed inside the propulsion tube, the cross section of the propulsion tube is occupied by the signal cable cross section, which hinders the use of the propulsion tube cross section. In addition, the work of connecting the propulsion pipes is complicated, and requires manpower in the shaft, making it extremely difficult to automatically connect the propulsion pipes.

The present invention has been made based on the above circumstances, and when measuring the tip position and posture of an underground propulsion drilling machine, eliminates the signal cable inside the propulsion pipe, improves the workability of the propulsion pipe, and effectively utilizes the cross section of the propulsion pipe. An object of the present invention is to provide a wireless position detection device for an underground propulsion drilling machine that can improve reliability and facilitate automatic connection of propulsion pipes.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is installed in an underground propulsion drilling machine, and the receiving means of the underground propulsion drilling machine is connected to the receiving means on the ground part or the shaft side. A position detection device that transmits position information wirelessly, comprising a position detection sensor that detects the attitude and position of the underground propulsion drilling machine, and a signal processing device that digitally encodes the attitude and position signal detected by the position detection sensor. and a data transmission transmitting coil for transmitting magnetic waves containing posture position information digitally encoded by the signal processing device to the receiving means.

(Function) In the above configuration, the rolling angle and pitching angle of the underground propulsion drilling machine are detected by, for example, a rolling meter and a pitching meter as position detection sensors, and these posture and position signals are digitally encoded by a signal processing device.

This digitally encoded attitude and position information is then applied to a data transmission transmitter coil, and a magnetic wave containing the attitude and position information is transmitted to receiving means on the ground or on the shaft side. On the ground or shaft side, data is received by a data receiving coil or the like constituting the receiving means, and this data receiving coil generates an induced voltage containing attitude and position information. This is then encoded to obtain posture position information such as the rolling angle and pitching angle of the underground propulsion drilling machine using a measuring device on the ground. Furthermore, the current position of the underground propulsion drilling machine is estimated by calculating attitude angles such as rolling angle and pitching angle according to the separately determined propulsion distance. Therefore, it is not necessary to lay a signal cable inside the propulsion pipe.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. This embodiment is applied to a polling type underground propulsion drilling machine in which hydraulic hoses for excavation and direction correction are not inserted into the propulsion pipe.

First, to explain the configuration of the wireless position detection device for an underground propulsion drilling machine, in Fig. 1, 1 is an above-ground part, 2 is a starting shaft dug into the soil, and inside the starting shaft 2 there is a A drilling machine main pushing device 3 is installed. Reference numeral 4 indicates the tip drilling bit of the underground propulsion drilling machine, 5 indicates the propulsion inner pipe of the soil propulsion drilling machine, 6 indicates the propulsion outer pipe of the soil propulsion drilling machine, and 7 indicates a power unit. Power is given to the underground propulsion drilling machine main pushing device 3, and the soil propulsion drilling machine main pushing device 3 causes the soil propulsion drilling machine propulsion inner pipe 5 to perform a rotational pressing operation to push the soil propulsion drilling machine in front of the soil propulsion drilling machine. Excavation of earth and sand is carried out using a tip excavation bit 4 located in the section.

A position detection device 10 that wirelessly transmits position information of the underground propulsion drilling machine is mounted on the inner circumferential surface of the outer propulsion tube 6, and a data reception coil as a reception means for receiving the position information is mounted on the ground section 1. 21 have been installed. Reference numeral 22 denotes a measuring device, and 23 denotes a data transmitter.As a fixed point for position detection in the ground section 1, it is also possible to measure at the ground section 1 above the position detection device 10, but the measuring device 22 The connected data transmitter 23 transmits attitude angle information to the starting shaft 2 by wireless transmission, the data receiver 24 receives the radio waves, and the angle is displayed on the operation panel 25. Measurements are taken on the side, and an operation panel 25 on the side of the starting shaft 2 allows not only excavation control but also direction correction.

Note that the data receiving coil 21 and the like serving as receiving means may be installed on the starting shaft 2 side.

As shown in FIGS. 2 and 3, the position detection device 10 includes a pitching meter 8 and a rolling meter 9 as position detection sensors for detecting the attitude and position of the underground propulsion drilling machine, and a detection angle as a signal processing device. Digital encoding device 11, sensing angle data transmission transmitter 12, and data transmission transmission coil 1
3 is built-in. The position detection device 10 is also equipped with a position detection transmitter coil 14 for transmitting tip position information and a position detection transmitter 15 for driving the coil. ]6 is a receiving coil for power supply disconnection, 17 is a power supply disconnection device, 18 is an amplifier, and 19 is a battery. Stainless steel or aluminum is used as the propelling material for the upper part of the position sensing device 10 in which the data transmission transmitting coil 13, the position sensing transmitting coil 14, etc. are built in, in order to reduce the attenuation of the generated magnetic field.

The wireless position detection device for an underground propulsion drilling machine of this embodiment is configured as described above, and operates as follows, so that the position information of the underground propulsion drilling machine can be wirelessly received by the receiving means of the above ground section 1. The signal is received by the coil 21.

When measuring the position of the underground propulsion drilling machine, when a magnetic wave for turning on the power is transmitted to the position detecting device 10 from a transmitting coil (not shown) installed in the above-ground part 1, this magnetic wave is transmitted to the receiving coil 16 for disconnecting the power. , an induced voltage is generated, the power disconnection device 17 is turned on, power is supplied from the battery 19 to each device in the position detection device 10, and the position detection device 10 is set to the operating state. Ru. The reason why the on/off mechanism of the battery 19 is made this way is to save power.
This is to ensure that one battery can be used for a long period of time.

Then, a pitching meter 8 and a rolling meter 9 as attitude position detection sensors generate voltages corresponding to the pitching angle and rolling angle of the underground propulsion drilling machine, and the voltage values are converted into digital codes by a detection angle digital encoding device 11. be converted into Next, the detected angle data transmission transmitter 12 supplied with power from the battery 19 and the amplifier 18 supplies an alternating current that digitizes the angle information (attitude position information) to the data transmission transmission coil 13. Data transmission magnetic field lines 26 are transmitted from the transmitting coil 13 to the above-ground part 1.
The data is transmitted to the data receiving coil 21 of.

In the above-ground part 1, data transmission magnetic field lines 26 are received by a data receiving coil 21, and a digitized induced voltage is generated in the data receiving coil 21. It is processed by a signal processing device built into the measuring instrument 22, and sent to the ground. The attitude angle of the propulsion drilling machine is measured.

In addition, the position detection transmitter 15 supplies an alternating current to the position detection transmitter coil 14, and the magnetic field generated from the position detection transmitter coil 14 is sent to the data reception coil 21, and the magnetic field strength is detected. , n1 determination of the propulsion position of the underground propulsion drilling machine is performed.

Then, using the two-sided constant values obtained as described above,
By accumulating the angular positions of the pitching angle and rolling angle with the propulsion position, the current position of the underground propulsion drilling machine is detected.

In the above-described embodiment, the position detection device 10 has three built-in coils: the data transmission transmission coil 13, the position detection transmission coil 14, and the power supply connection/disconnection reception coil 16. It is also possible to use one or two coils.

Furthermore, although the position detection device 10 is installed on the inner surface of the outer propulsion pipe 6, the position detection device 10 can also be installed inside the inner propulsion pipe 5. By using the cross section, the installation position of the position sensing device 10 can be selected more widely than before.

[Effects of the Invention] As described above, according to the present invention, it is possible to eliminate the signal cable in the propulsion pipe, so that the workability of the propulsion pipe connection is improved and the connection work time can be shortened. Moreover, by eliminating the signal cable, there are no connection points for the signal cable, and as a result, there is no contact failure at the connection part, and reliability is improved in determining the position of the underground propulsion drilling machine. Furthermore, since there is no section dedicated to cables in the propulsion tube, the cross section of the propulsion tube can be used effectively. For example, in a poling-type underground propulsion drilling machine where hydraulic hoses for excavation and direction correction are not inserted into the propulsion pipe, the only work in the shaft during pipe propulsion is the process of connecting the propulsion pipe. This makes automation easier, reducing the amount of work required inside the shaft and allowing for safer work.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the wireless position detection device for an underground propulsion drilling machine according to the present invention. FIG. 3 is an enlarged sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view taken along the line B-B in FIG. 2, and FIG. 4 is a configuration diagram showing a conventional position detection device for an underground propulsion drilling machine. 1: Aboveground part, 2: Starting shaft, 5: Inner tube for propulsion of underground propulsion drilling machine, 6: Outer tube for propulsion of underground propulsion drilling machine, 8: Pitching meter (position detection sensor), 9: Rolling meter (position detection sensor) ), 10: position detection device, 11: detection angle digital encoding device (signal processing device), 13: transmitting coil for data transmission, 21: data receiving coil constituting receiving means.

Claims (1)

[Claims] A position detection device that is mounted on an underground propulsion drilling machine and wirelessly transmits position information of the underground propulsion drilling machine to a receiving means on the ground or on the shaft side, and detects the attitude and position of the underground propulsion drilling machine. a signal processing device that digitally encodes the posture position signal detected by the position detection sensor; and a signal processing device that transmits a magnetic wave containing the posture position information digitally encoded by the signal processing device to the receiving means. 1. A wireless position detection device for an underground propulsion drilling machine, comprising a transmitting coil for data transmission.