JPH1061373A - Method and device for measuring shield joining position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the measurement of a shield joining position irrespective of a tunnel constructing position and miniaturize a device. SOLUTION: With first and second shield machines 1, 2 opposed to each other at a predetermined interval, a borehole 14 is bored by a boring mechanism 6 toward the second shield machine 2, and the end of an auger screw 7 is made to about to a cutter disk 15. By striking the auger screw 7 with a hammer or by other means, an elastic wave is transmitted to the second shield machine 2 and is detected by a detecting element 17 to measure the relative positions of the first and second shield machines 1, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring a shield joining position suitable for joining two shield tunnels underground.

[0002]

2. Description of the Related Art In general, when one shield tunnel is constructed, two shield machines are constructed from two sides of each shield tunnel, and these two shield tunnels are sometimes joined underground. .

Conventionally, when joining a shield tunnel underground in this way, in order to confirm the joining position, when two shield machines reach a position facing each other across a ground with a predetermined interval, The relative positions of both are measured.

In order to measure the junction position of such a shield tunnel, for example, a method of excavating a boring hole for checking from the ground and measuring the positions of both shield machines with the bore hole is used. A method of forming a small bored hole horizontally and measuring the position of the other shield machine through this borehole.A small bored hole is formed horizontally from one shield machine side, and a magnetic sensor or There is a method of finding the position of the other shield machine through a radio isotope sensor, and the like.

[0005]

However, the conventional method and apparatus for measuring the position of the shield joint as described above have the following problems. First, when measuring the shield joint position, when drilling a boring hole for checking from the above ground, if the tunnel construction position is at a large depth or under the seabed, it is impossible to construct the boring hole itself Often it is. According to the method, when the center axis of one shield machine and the center axis of the other shield machine are largely displaced, even if a boring hole is formed horizontally from one shield machine, May not reach the shield machine. Further, in the case where a borehole is formed horizontally in the ground, the stoppage of groundwater becomes large.
In addition, the method requires a device such as a magnetic sensor or a radioisotope sensor in addition to a boring device for excavating a boring hole horizontally. There is a problem that the device becomes large. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to reliably measure a shield bonding position regardless of a tunnel construction position, and to reduce a size of an apparatus. It is an object to provide a position measuring method and a measuring device therefor.

[0006]

The invention according to claim 1 is
When excavating one shield tunnel by joining two shield tunnels excavated by two shield machines, one of the shield machines is provided with a boring mechanism for forming a boring hole toward the front. At the same time, a detecting member capable of detecting an elastic wave is attached to a cutter disk provided in the front part of the other shield machine, and thereafter, in a state where the two shield machines face each other at an interval, A boring hole is formed in the boring mechanism of the shield machine toward the other shield machine, and at the time when the tip of the boring mechanism contacts the cutter disk of the other shield machine, the elastic wave generating means The generated elastic wave is transmitted from the one shield machine side to the other shield machine through the boring mechanism, and By detecting the position of the tip of the boring mechanism with respect to the other shield machine by detecting an elastic wave with the detection member, the relative position between the one shield machine and the other shield machine is measured and shielded. It is characterized by measuring the junction position of the tunnel.

According to a second aspect of the present invention, in the method for measuring a shield joining position according to the first aspect, when the tip of the boring mechanism comes into contact with a cutter disk of the other shield machine, The position of the tip is measured from the one shield machine side.

According to a third aspect of the present invention, there is provided an apparatus for measuring a shield joining position used when excavating one shield tunnel by joining two shield tunnels excavated by two shield machines, respectively. A boring mechanism for forming a boring hole from the shield machine to the other shield machine, a detecting member installed on a cutter disk of the other shield machine for detecting an elastic wave, and generating an elastic wave, And an elastic wave generating means for transmitting the wave to the boring mechanism on one of the shield machines.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for measuring a shield joint position and an apparatus for measuring the position according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, shield tunnels T1 and T2 are excavated from both sides by a first shield machine (one shield machine) 1 and a second shield machine (the other shield machine) 2, respectively. These shield tunnels T
When joining one shield tunnel T by joining T1 and T2 in the ground, the first shield machine 1 and the second shield machine 2 face each other across the ground G at a predetermined distance. At this point, confirm both positions.

For this, a measuring device having the following configuration is used. The first shield machine 1 is provided with a small-diameter boring mechanism 6 behind the bulkhead 4 and inside the skin plate 5. As shown in FIG. 2, the boring mechanism 6 includes an auger screw 7
And a propulsion pipe 9 and a propulsion pipe 9 pushed forward by a jack (not shown). At the tip of the auger screw 7, a stirring screw 7a for stirring the ground is provided. A projection 10 is formed at the center of the stirring screw 7a, and a target 11 such as a luminous body is attached to the rear side. The target 11 is used to measure the position of the target 11 from the inside of the first shield machine 1 by the transit 12 as described later. As shown in FIG. 1, the auger screw 7, the leading conduit 8, and the propulsion pipe 9 pass through manholes and the like (not shown) provided on the bulkhead 4 and the cutter disk 13 of the first shield machine 1 and are forwardly provided. It is designed to extend. Then, the ground G is stirred by the auger screw 7 to send the earth and sand backward,
By propelling the propulsion pipe 9, a boring hole 14 is excavated in the ground in front of the cutter disc 13 of the first shield machine 1.

As shown in FIGS. 2 and 3, the other second shield machine 2 has a rear surface side of the cutter disk 15a of the cutter disk 15 or a rear surface side of the face plate 15b (in the present embodiment, the face plate 15b On the back side), a detection unit 16 for detecting an elastic wave such as an ultrasonic wave is provided. The detection unit 16 has a configuration in which a large number of detection elements (detection members) 17, 17,... Are mounted at regular intervals in the vertical and horizontal directions within a predetermined range having predetermined vertical and horizontal dimensions. For example, a piezoelectric element or the like is used for each detection element 17, and the sensor section is attached to the back surface of the face plate 15 b so as to be in contact therewith. These detecting elements 17 are connected to a measuring device (not shown), and based on the time when each detecting element 17 detects an elastic wave such as an ultrasonic wave, the detecting unit 1 is determined from these time differences.
The position within which the elastic wave is transmitted can be specified.

In order to measure the position of the second shield machine 2 from the side of the first shield machine 1 facing at a predetermined interval by using such a measuring device, first, as shown in FIG.
When the first shield machine 1 and the second shield machine 2 excavate to positions separated by a predetermined distance, the excavation is stopped.

Next, the boring mechanism 14 excavates the boring hole 14 horizontally in the ground G in front of the first shield machine 1. Then, as shown in FIG. 2 and FIG. 4, the protrusion 10 at the tip of the auger screw 7 is
The excavation is stopped when the cutter disk 15 comes into contact with the cutter disk 15.

Subsequently, as shown in FIG. 2, the position of the target 11 is measured through the boring hole 14 by the transit 12 from within the first shield machine 1. Thereby, the position of the stirring screw 7a with respect to the first shield machine 1 can be known.

Then, after the cutter disk 15 is rotated in the second shield machine 2 to position the detection unit 16 at a predetermined position, the auger screw 7 is moved in the first shield machine 1 by an elastic wave such as a hammer. Hit with the generating means. Then, the elastic wave is transmitted to the cutter disk 15 of the second shield machine 2 via the auger screw 7 and the projection 10 at the tip. The elastic wave transmitted to the cutter disk 15 is detected by a detecting unit 16 provided on the back side of the face plate 15b.
Are detected by the detecting elements 17, 17,... As described above, based on the difference between the times at which the detecting elements 17 detect the elastic waves, a measuring device (not shown) determines to which position on the front side of the face plate 15b the elastic waves are transmitted, It is specified whether the projection 10 of the auger screw 7 is in contact with the position.

In this manner, the position of the tip of the auger screw 7 with respect to the first shield machine 1 is specified, and the position of the tip of the auger screw 7 with respect to the second shield machine 2 is specified. Shield machine 1
Is measured with respect to the position of the second shield machine 2. Therefore, thereafter, based on the measurement results, the excavation directions of the first shield machine 1 and the second shield machine 2 are corrected as necessary, and the shield tunnels T1 and T2 are joined to perform one shield tunnel. Construct T.

In the above-described method and apparatus for measuring the shield joining position, the boring mechanism 6 is attached to the first shield machine 1.
Are provided on the cutter disk 15 of the second shield machine 2 with detecting elements 17, 17,... Then, in a state where the first shield machine 1 and the second shield machine 2 face each other at a predetermined interval, the boring mechanism 6 excavates the boring hole 14 from the first shield machine 1 to the second shield machine 2. The tip of the auger screw 7 is brought into contact with the cutter disk 15 and
The second shield machine 2 by hitting the surface with a hammer
The position of the auger screw 7 with respect to the second shield machine 2 can be detected by detecting the elastic wave with the detecting element 17. Furthermore, the target 1 set at the tip of the auger screw 7
By measuring the position of the first shield machine 1 from the side of the first shield machine 1 with the transit 12, the relative position between the first shield machine 1 and the second shield machine 2 can be measured.
The shield joining position can be measured. By applying the above measurement method, even if the shield tunnel T is constructed underground at a large depth or under the seabed, the shield joint position is measured without any trouble,
The shield tunnels T1 and T2 can be joined. Further, even when the excavation directions of the first shield machine 1 and the second shield machine 2 are deviated, it is possible to cope with this by increasing the range of the detection unit 16.

The measuring apparatus used in the method for measuring the shield joining position includes a boring mechanism 6, a transit 12, detecting elements 17, 17,..., And a hammer (not shown) for generating an elastic wave. It is composed of Accordingly, the first shield machine 1 does not need to include any devices other than the boring mechanism 6, and the device is significantly larger than devices using a conventional magnetic sensor or radio / isotope sensor. The size can be reduced. Also in the second shield machine 2, it is only necessary to install the detecting element 17 on the cutter disk 15, so that the size of the device is not increased. In addition, the effect can be obtained at a low cost because the detecting element 17 is inexpensive, not to mention the hammer.

In the above embodiment, the first shield machine 1 and the second shield machine 2 have any other configurations as long as they have the boring mechanism 6 and the detecting element 17. May be. Also,
A target 11 is provided at the tip of the auger screw 7,
Although the boring hole 14 is excavated and its position is measured by the transit 12, the position of the auger screw 7 with respect to the first shield machine 1 can be guaranteed within a predetermined accuracy after excavating the boring hole 14. Then target 11 and transit 12
May be omitted. further,
As the detection element 17, any component may be used as long as it can detect an elastic wave such as an ultrasonic wave generated by hitting the auger screw 7 with a hammer or the like.

[0021]

As described above, according to the method for measuring the shield joining position according to the first aspect, one of the shield machines is provided with a boring mechanism, and the other shield machine has an elastic wave on the rear surface side of the cutter disk. In the state where the two shield machines face each other at an interval, a boring hole is formed from one shield machine to the other shield machine,
When the tip of the boring mechanism comes into contact with the cutter disk of the other shield machine, an elastic wave is transmitted from the one shield machine side through the boring mechanism, and this is detected by the detection member on the other shield machine side. The configuration is such that the relative position between one shield machine and the other shield machine is measured to measure the junction position of the tunnel. By applying such a measurement method, even if a shield tunnel is to be constructed underground at a large depth or under the seabed, there will be no trouble, and the shield tunnel is measured by measuring the shield joint position. Can be joined. Further, even when the direction of excavation is deviated between one shield machine and the other shield machine, it is possible to cope with this deviation by increasing the range in which the detection member is attached.

According to the method for measuring the shield joining position according to the second aspect, when the tip of the boring mechanism comes into contact with the cutter disk of the other shield machine, the position of the tip of the boring mechanism is changed to one shield machine. The measurement is performed from the side. Thereby, even if the boring hole is displaced with respect to the one shield machine, the relative position between one shield machine and the other shield machine can be detected.

According to a third aspect of the present invention, there is provided a boring mechanism for forming a boring hole from one shield machine to the other shield machine, and a boring mechanism installed on a cutter disk of the other shield machine. The shield member includes a detecting member for detecting the elastic wave and an elastic wave generating means for transmitting the elastic wave to the boring mechanism on one of the shield machines. Thus, the method for measuring the shield joining position according to claim 1 or 2 can be realized. Further, on one shield machine side, in addition to the boring mechanism, only an elastic wave generating means may be provided,
As this elastic wave generation means, it can fully fulfill its function with a hammer or the like, so compared to a device using a conventional magnetic sensor or radio / isotope sensor,
The size of the device can be significantly reduced. Also, on the other shield machine side, it is only necessary to install a detecting member such as a piezoelectric element for detecting an elastic wave on the cutter disk, so that no increase in the size of the device is caused. Moreover,
Since these detecting members and elastic wave generating means are all inexpensive, the above effects can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a method of measuring a shield joint position and a measuring apparatus according to the present invention, and shows a state in which a boring hole is formed from one shield machine to another shield machine. It is sectional drawing.

FIG. 2 is a vertical sectional view showing a state in which the boring hole has reached the other shield machine.

FIG. 3 is a side view showing a detection member provided in the other shield machine.

FIG. 4 is an elevational sectional view showing the entire configuration in the state of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First shield machine (one shield machine) 2 Second shield machine (the other shield machine) 6 Boring mechanism 15 Cutter disk 17 Detecting element (detecting member) T, T1, T2 Shield tunnel

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Osamu Urata 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation Inside the corporation

Claims (3)

[Claims] 1. Excavated by two shield machines, respectively.
When excavating one shield tunnel by joining two shield tunnels, one of the shield machines is provided with a boring mechanism for forming a boring hole toward the front, and the other shield machine is provided with the boring mechanism. A detecting member capable of detecting an elastic wave is attached to a cutter disk provided at a front portion, and thereafter, in a state where the two shield machines face each other at an interval, the boring mechanism of one shield machine uses the other boring mechanism. A boring hole is formed toward the shield machine, and when the tip end of the boring mechanism comes into contact with the cutter disk of the other shield machine, the elastic wave generated by the elastic wave generating means is applied to the one shield machine. Transmitted from the machine side to the other shield machine through the boring mechanism, the elastic wave is detected by the detection member, By detecting the position of the tip of the boring mechanism with respect to the other shield machine, measuring the relative position between the one shield machine and the other shield machine to measure the joint position of the shield tunnel. Measurement method of shield joint position to be used. 2. The method according to claim 1, wherein the position of the tip of the boring mechanism is changed when the tip of the boring mechanism comes into contact with a cutter disk of the other shield machine. A method of measuring a shield joining position, wherein the measurement is performed from one shield machine side. 3. Excavated by two shield machines, respectively.
A shield joining position measuring device used when excavating one shield tunnel by joining two shield tunnels includes a boring mechanism for forming a boring hole from one shield machine to the other shield machine. A detecting member installed on a cutter disk of the other shield machine for detecting an elastic wave, and an elastic wave generating means for generating an elastic wave and transmitting the generated elastic wave to the boring mechanism on the one shield machine side. A measuring device for a shield joining position, characterized in that: