JPS6295480A - Receiver for position measurement of tunnel drilling machine - Google Patents

Abstract

PURPOSE:To reduce the size of a receiver for position measurement and to eliminate the need for a rotating device by receiving a magnetic field which is generated by a magnetic field generating device installed on the ground surface by plural magnetoelectric converting elements arrayed and fitted to a hemispherical fitting plate in cross directions at equal intervals. CONSTITUTION:The fitting plate 3-1 has its top surface formed hemispherically and the magnetoelectric converting elements 3a1-3an and 3b1-3bn are fitted on the top surface of the fitting place 301 at equal intervals. In this case, the magnetoelectric converting elements 3a1-3an and 3b1-3bn are arranged in the cross directions so as to cross each other on the same plane. The receiver A has the magnetoelectric converting elements fitted on its hemispherical surface at equal intervals and detect X-axial and Y-axial field s from magnetic field producing deices 2a and 3b to a tunnel planning line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a position measurement receiver KISFJ that measures the current position of an underground tunneling machine using a magnetic field from the ground surface.

[Conventional technology]

Conventional receivers for measuring the position of tunnel excavators are disclosed in Japanese Patent Application No. 125100/1982 and Japanese Patent Application No. 128/1984! 64
As mentioned in the issue, there are some that use electromagnetic coils. In the method of using an electromagnetic coil as a receiver, an electromagnetic coil is mounted inside the tunnel excavation machine, this electromagnetic coil generates an alternating magnetic field, the intensity distribution of the magnetic field is measured using the receiving coil on the ground surface, and the reception level is determined. There is a method to detect the position by finding the maximum or minimum value of . In addition, an electromagnetic coil is installed on the ground surface, and a receiving coil is installed inside the tunnel boring machine.
There is also a method of determining the minimum value of the reception level by measuring the intensity distribution of the magnetic field with respect to the reception coil while rotating the reception coil.

[Problem that the invention seeks to solve]

A receiver 8 is equipped with the electromagnetic coil described above in a tunnel excavating machine and detects the reception level at the receiver coil /l/ on the ground surface.
In this case, the worker who performs the reception operation is on the tunnel plan line, that is, on the public road, so there are difficulties in preventing damage to passing vehicles and ensuring the safety of the worker. Similar to the above method, installing a receiving coil inside a tunnel boring machine can ensure the safety of workers on the ground, but
In order to detect the magnetic field generated by the electromagnetic coil and find the minimum value from the intensity distribution of the magnetic field, a drive device is required to rotate the receiving coil, and a small-diameter tunnel excavator is equipped with a receiver. There was a drawback that it was difficult to do so.

The present invention solves these shortcomings and provides a receiver for position measurement of tunneling machines that uses a magnetic field that is small in size and does not require a driving device, which can be easily mounted on a small diameter tunneling machine with an outer diameter of about 30σ. Our goal is to provide the following.

[Structure of the invention]

The present invention receives a magnetic field generated from a magnetic field generator installed on the earth's surface by a plurality of magnetoelectric transducers attached to a mounting plate having a spherical shape and arranged in a cross direction at equal intervals. This is what I did.

〔Example〕

FIG. 1 is a diagram showing the configuration of a receiver 85A according to the present invention, and FIG.
The figure is an explanatory diagram showing the state in which the position of the tunnel boring machine is measured using receiver A, and Figure 3 shows the state of magnetic field distribution and receiver A.
Figure 4 is a diagram showing an example of the output of receiver A, Figure 5 is a diagram showing the vertical component of the magnetic field applied to the magnetoelectric conversion element in Figure 3, and Figure 6 is a diagram showing the magnetoelectric conversion element. The attachment obtained from the output of the element is an explanatory diagram for calculating the position to the receiver from the angle.

In Fig. 2, 1 is a tunnel excavator, 2a and 2b are magnetic field generators, A is a receiver that detects the magnetic field generated by the magnetic field generators d2a and 2b, and 4&''L is an acceleration that measures the horizontal displacement of the tunnel excavator 1. 5 is a power cable that supplies power to receiver A, 6 is a signal cable that transmits the output from receiver A and accelerometer 4, 7 is a power supply, 8 is receiver A,
This is a measuring device that measures the output from the accelerometer 4.

FIG. 1 ral, (b) is a diagram showing details of the receiver A, 3a+, 3a2''・3an t 3b+,
3bz'' and 3bn are magnetoelectric conversion elements that generate voltage when a magnetic field perpendicular to the sensing surface is applied, and 3-1 is a magnetoelectric conversion element 3a+3ar...3an, 3b+,
This is a mounting plate for attaching 51yz-3bn. The mounting plate 3-1 has an upper surface formed in a minor spherical shape. Magnetoelectric conversion element 3a+ +3a2...3an,
3b+, 3b2" and 3b are attached to the upper surface of the mounting plate 3-1 at regular intervals. In this case, the magnetic conversion elements 3a+, 3a2...3an and the magnetoelectric conversion elements 3b+, 3br... 5'bn are arranged in a cross direction so as to be orthogonal to each other when viewed from above.

Next, we will describe a method for detecting the intensity distribution of the magnetic fields generated from the magnetic field generators 2a and 2b using the receiver A configured as described above. Conversion element 3&1゜3a2...3a,,
, 3b+, 3bt -3bn are installed at equal intervals, and the magnetic field generators 2a, 2b are attached to the tunnel planning line.
Can detect magnetic fields in the X-axis and Y-axis directions from 5
When the magnetic field generators 2a, 2b and the receiver A are far apart as shown in Fig. 3, the intensity distribution of the magnetic field is considered to be linear, so the magnetoelectric transducers 3a+, 3ay...
As shown in Fig. 5, the magnetic field applied to the receiver A in which 3an are installed at equal intervals is the magnetic field of the vector component Hr? The output characteristics shown in FIG. 4 are obtained depending on the strength of this magnetic field, which is applied perpendicularly to the element surface. Magnetoelectric conversion element 3a showing the maximum value of output from the output characteristics obtained in Fig. 4
, to the mounting plate 3-1 is determined by α shown in FIG. 6 based on the angle and horizontal displacement from the accelerometer 4.

Similarly, θ can be obtained using the magnetoelectric transducer sbn.

It is also possible to calculate the strength distribution of the magnetic field from the magnetic field generator fit2b using the above method to calculate αt, θ! can be found. α7 obtained here. θ.

The position of the receiver A can be measured by substituting the equation (2)K into the calculation formula.

,,=ta+□aI゛4 ・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・ (1)
-Ishi Ryo Seiichi・・・・・・・・・・・・(Niji)Also, α2.
The position of the receiver can be measured by similarly substituting θ into the calculation formula, and the accuracy can be further improved by comparing these two solutions.

〔Effect of the invention〕

According to the present invention, in order to measure the position of the tunnel excavating machine, a receiver using a plurality of magnetic converting elements is installed in the tunnel excavating machine, so that the tunnel excavating machine can be pushed without having to perform position measuring work on a public road. Since the position of the ffi can be measured, the safety of workers performing measurement work can be ensured. In addition, the magnetoelectric transducer used in the receiver is small, robust, and highly reliable (and can be installed inside a small-diameter tunnel excavation machine, making it possible to use the receiver even when measuring the magnetic field strength distribution from a magnetic field generator. Unlike a receiver using a 'Bi magnetic coil, the magnetic field strength can be measured without rotating the electromagnetic coil, so there is an advantage that a rotating device is not required.

[Brief explanation of drawings]

FIG. 1 (al is a receiver A shown as an embodiment of the present invention)
Figure 1 ('b) is a side view of the same, Figure 2 is an explanatory diagram showing how receiver A is used to measure the position of a tunnel boring machine, and Figure 3 is a diagram showing the magnetic field distribution and reception. 4 is a characteristic diagram showing an example of the output of receiver A, FIG. 5 is an explanatory diagram showing the state of the magnetic field applied to the magnetic conversion element, and FIG. 6 is a diagram showing the state of the magnetic field applied to the magnetic conversion element. It is an explanatory diagram showing a method of calculating one year old. A...Receiver, 3a+~3a, , 3b
+~3bo...Magnetoelectric conversion element, 3-1...
...Mounting plate. Applicant: Nippon Telegraph '#M, Hana Co., Ltd. Agent: Masatake Bouga, ・(a) A: 415″4 3a+ ~3ant 3bt ~3bn: 3-1
: Torii de Ding J Uke/aat, flame school woodchi 1 turtle change weight + tsu・÷/7warikiτ 1

Claims (1)

[Claims] A method for measuring the position of a tunnel excavating machine by detecting the magnetic field generated by a magnetic field generating device installed on the road surface with a receiver installed in a tunnel excavating machine in a tunnel, and determining the direction of the magnetic field generating device using the receiver. A receiver used for , A receiver for position measurement of a tunnel excavator, characterized in that the plurality of magneto-electric conversion elements described above are arranged and attached in a cross direction at equal intervals.