JPH0791939B2 - Position detection sensor for shield machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sensor for detecting the position of a shield machine that excavates underground, for example, one tunnel using two shield machines. The present invention relates to a shield machine position detection sensor for confirming the positions of shield machines when excavating from both sides.

“Prior art and its problems” Conventionally, as a position detection sensor of this type of shield machine, one using a magnetic sensor, a sound wave sensor, etc. is known, but it has a complicated structure and is called underground. Under the conditions, there is a problem that there is a limit in accuracy.

The present invention has been made in view of the above problems, and provides a position detection sensor for a shield machine that can accurately and reliably detect the position of the shield machine with a relatively simple structure even in the ground. It is an object.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides a tip portion of a boring device installed in a digging pit or another shield machine at a predetermined position of the bulkhead of the shield machine. It is characterized in that it is provided with a pressure receiving means for detecting the contact with the pressure receiving means, and the pressure receiving means is composed of an assembly of pressure receiving portions such as a strain gauge and an earth pressure gauge.

In addition, an assembly of rod-shaped members in which the pressure receiving means is slidably arranged in the axial direction, and the boring device are brought into contact by being arranged on the back surface of the rod-shaped member and pressed by the rod-shaped member. It may be provided with a pressure receiving portion capable of detecting the above position.

[Examples] Hereinafter, the present invention will be described with reference to the drawings. 1 to 12 are views for explaining an embodiment of the position detection sensor of the shield machine of the present invention, and when constructing the tunnel under the seabed, the tunnel is constructed by using two shield machines. It is applied when excavating from both sides and joining.

The first embodiment will be described with reference to FIGS. 1 to 10. First, reference numeral G in FIG. 3 is the ground near the junction of the shield tunnel excavated from both sides.
Inside, the tunnel Ta is excavated on the right side with respect to the paper surface by the first shield machine 1, and the tunnel Tb is excavated on the left side with respect to the paper surface by the second shield machine 2. The shield machine 1 has an outer shape formed by a cylindrical skin plate 1a and a bulkhead 1b fixed to the front portion thereof.
A cutter device 2 is installed at the center of the. further,
Inside the skin plate 1a are multiple shield jacks 3
Are arranged at predetermined intervals in the circumferential direction, and the bulkhead
Inside the 1b, a screw conveyor 4 for discharging the earth and sand taken in from the face into the cutter frame is installed.

Further, a pressure receiving means P for detecting that the tip of a boring device installed in another shield machine 5 described later comes into contact with a predetermined position of the bulkhead 1b, which is separated from the base line C1 of the shield machine 1 by a predetermined distance. Is installed. As shown in FIG. 1 and FIG. 2, this pressure receiving means P is a collection of pressure receiving portions P1, P1, ... Using a strain gauge, an earth pressure gauge, etc. Are arranged without a gap so as to be in a flat state, and the container P2 is fixed to the bulkhead 1b, and the pressure receiving parts P1, P1, ...
A cable k for transmitting the detection signal of (2) to a detection device (not shown) arranged at a predetermined location in the shield machine 1 is provided. Further, the respective pressure receiving portions P1, P1, ... In the pressure receiving means P are accurately set in the positional relationship with the base line C1 of the shield machine 1.

The second shield machine 5, like the first shield machine 1, has an outer shape formed by a cylindrical skin plate 5a and a bulkhead 5b fixed to the front portion thereof, and the center of the bulkhead 5b. A cutter device 6 is installed in the section. Further, a plurality of shield jacks 7 are arranged inside the skin plate 5a, and the bulkhead
A screw conveyor 8 is installed inside the 5b, and at a predetermined position of the bulkhead 5b (where the positional relationship with the baseline C2 of the shield machine 5 is similar to the positional relationship between the pressure receiving means P and the baseline C1). An entrance 9 for inserting a lead pipe of a boring device, which will be described later, is mounted. As shown in FIG. 9, the entrance 9 includes a pipe 10 fixed to the inside of the bulkhead 5b, a gate valve 11 attached to the pipe 10, and a packing 12 arranged inside the end of the pipe 10. And a slide packing 13 slidably fitted to the tube 10 and the like.

Next, the operation of the position detection sensor of the shield machine according to the present invention configured as described above will be described along with its usage example.

First, the shield machines 1 and 5 having the above-mentioned configurations are carried in from separate starting shafts (not shown) near both ends of the tunnel, and while performing one-sided push-down survey, the ground G under the seafloor is joined to the joining point. It is propelled by driving the jacks 3 and 7 while cutting the ground by the cutters 2 and 6 on the front sides toward each other. Then, excavate from both sides of the tunnel to be built to the vicinity of the junction, and as shown in FIG.
Arrives at the planned position, and the shield machine 1 reaches the planned position (position away from the shield machine 5 by about 50m to 100m)
When it reaches, stop the shield machine.

Next, as shown in FIG. 4, after disassembling the inside of the shield machine Tb with the gap portion formed in the cutter device 6 aligned with the position of the entrance 9, as shown in FIG. The boring device B is installed at a predetermined position in the machine Tb. At that time, the lead pipe B1 of the boring machine B
Align so that the base line Bc of is parallel to the base line C2 of the shield machine 5. As shown in FIG. 10, a head B2 having a triangular cross section is provided inside the lead pipe B1, and the end of the lead pipe B1 on the shield machine 6 side is provided on the back surface of the head B2. There is a correction direction indicator lamp B4 that can be seen from Transit B3, and in addition, Transit B3 is equipped with a monitor camera B5 for displaying the image on a TV (not shown). ing. And
As shown in FIG. 6, the entrance 9 of the bulkhead 5b.
The gate valve 11 is opened and the lead pipe B1 of the boring device B is inserted through the boring device B.
Drive.

Further, after the lead pipe B1 is inserted through the gap of the cutter device 6, horizontal boring is performed toward the pressure receiving means P of the shield machine 1 stopped at the arrival planning position. When performing boring, the head B2 is rotated to excavate the natural ground G, and the work is carried out while confirming whether the correction direction indicator lamp B4 displayed on the television by the monitor camera B5 is displaced. Then, as shown in FIG. 10 (a), when the position of the correction direction indicator lamp B4 is displaced from the center of the transit B5 and the lead pipe B1 is deformed, FIG. As shown in FIG. 10, the head B2 is rotated in accordance with the correction direction, and in this state, it is propelled as shown in FIG. 10 (c). By doing so,
The head B2 receives a reaction force from the natural ground G and the deformation is corrected. After the correction, as described above, boring is performed by the lead pipe B1 while rotating the head B2 again.

Then, as shown in FIG. 7, when the head portion B2 of the lead pipe B1 comes into contact with a predetermined pressure receiving portion P1 of the pressure receiving means P through the gap of the cutter device 2, the maximum current is applied to the pressure receiving portion P1. This flows through the cable k and is transmitted to a detection device (not shown) in the shield machine 1. This makes it possible to know how far the tip of the lead pipe B1 has come into contact with the base line C1 of the shield machine 1, and to measure the base line C2 of the shield machine 5 and the base line Bc of the lead pipe B1 measured in advance. The relative position of the base lines C1 and C2 of the shield machines 1 and 5 can be confirmed from the positional relationship between the position of the shield machine 1 and the point where the base line C1 of the shield machine 1 and the head 2 of the lead pipe B1 contact each other.

The extent to which the tip of the lead pipe B1 is deformed from above the base line Bc can be detected by the amount of deviation of the correction direction indicator lamp B4. In addition, the lead pipe B1
In order to detect the accurate position of the tip (head B2) of the, the laser beam may be measured from the end of the lead pipe B1 on the shield machine 5 side.

Next, the tip of the boring device B is connected to the pressure receiving portion of the pressure receiving means P.
After confirming the relative positions of the shield machines 1 and 5 by bringing them into contact with P1, the lead pipe B1 is retracted by a predetermined distance. Then, while the trajectory of the shield machine 1 is corrected and moved forward by a distance between them, the shield machine 1 is stopped, and then the tip of the lead pipe B1 is again brought into point contact with the pressure receiving means P of the shield machine 1 so that the shield machines 1 and 5 move relative to each other. Check the position.

Similarly, by repeating the above steps, the shield machine 1 is gradually moved closer to the shield machine 5 while correcting the trajectory, and finally the base lines C1 and C2 are made to coincide with each other.

The distance for retracting the lead pipe B1 is determined by the number of rings in the segment.As the shield machines 1 and 5 approach, the number of rings is reduced, that is, the lead pipe B1 is retracted and the distance is shortened. It is desirable to increase the accuracy of. Also, the lead pipe B1
The work of confirming the relative positions of the shield machines 1 and 5 by making point contact with each other is performed within the assembly time of the segment.

As described above, the present invention provides a strain gauge, an earth pressure gauge, or the like for detecting that the tip portion B2 of the boring device B installed in another shield machine 2 comes into contact with a predetermined position of the bulkhead 1b of the shield machine 1. Since the pressure receiving means consisting of an assembly of the pressure receiving portions P1, P1, ... Is provided, accurate and reliable with a relatively simple structure without providing an observation hole for measurement in the natural ground G. Further, the position of the shield machine 1 can be detected, and highly accurate joining of the shield machine can be realized. Therefore, it is possible to realize a significant reduction in the construction cost, and it is an optimum sensor to be used especially in the tunnel junction construction method in urban areas or under the sea floor.

Further, according to the sensor of the present invention, after the shield machine is propelled, the position of the shield machine can be measured within the time for assembling the segments, which causes a delay in the tunnel construction period. Nor.

Next, the second embodiment will be described with reference to FIGS. 11 and 12. The pressure receiving means P is a set of rod-shaped members P3, P3, ... Arranged slidably in the axial direction. Body and this rod
It is composed of a center of gravity position measuring device (pressure receiving part) P4 arranged on the back of P3, P3, ...
The rod-shaped members P3, P3, ... Are arranged on the P2 without a gap so that the surfaces are flat, and the container P2 is fixed to the bulkhead 1b, and from the bottom of the container P2. A cable k for transmitting the detection signal of the pressure receiving portion P4 to a detection device arranged at a predetermined position in the shield machine 1 is provided. In addition, the pressure receiving portion P4 of the pressure receiving means P is accurately set in the positional relationship with the base line C1 of the shield machine 1.

Then, as in the above-mentioned embodiment, when the tip portion B2 of the boring device B comes into contact with an arbitrary rod-shaped member P3, this rod-shaped member P3
Is pushed rearward, and slides on another rod member P3 to push the center-of-gravity position measuring device P4. As a result, from the load point acting on the gravity center position measuring device P4, the boring device B
It is possible to detect the contact point of.

Therefore, the position detecting sensor of the shield machine according to the second embodiment also has the same operation and effect as those of the first embodiment.

In addition, other embodiments and technical matters other than the above will be described below.

(I) In the above embodiment, the container P2 is formed in a hexagonal shape, and the pressure receiving portion P1 and the rod-shaped member P3 are formed in a circular cross section, but the invention is not limited to this. The shape of the container P2 can be changed to any shape such as a circle, an ellipse, an octagon, etc., as well as the pressure receiving portion P1 and the rod-shaped member.
The cross-sectional shape of P3 may be any as long as it covers the surface of the container P2 without any gap.

(Ii) The pressure receiving means P may be any one other than that shown in the above-mentioned embodiment as long as it can accurately detect the position where the tip of the boring device makes point contact.

(Iii) In the above embodiment, the present invention was used in the case of joining two shield machines in the middle of the tunnel, but the invention is not limited to this, and when one shield machine reaches the reaching shaft. Can also be applied.

"Effects of the Invention" As described above, the present invention provides a pressure receiving means for detecting that a tip of a boring device installed in an excavation pit or another shield machine comes into contact with a predetermined position of the bulkhead of the shield machine. Since this pressure receiving means is formed by an aggregate of pressure receiving parts such as strain gauges and earth pressure gauges, it is not necessary to provide an observation hole for measurement in the ground, and the position of the shield machine can be compared. It is possible to detect accurately and surely with a relatively simple structure, and it is possible to realize highly accurate joining of the shield machine.

[Brief description of drawings]

1 and 2 are views showing the main part of a first embodiment of the present invention. FIG. 1 is a front view of a position detection sensor of a shield machine, and FIG. 2 is a side sectional view of FIG. , FIG. 3 to FIG. 8 are views for explaining the method of using the present invention.
The figure shows a cross-sectional side view of the shield machine in which the shield machine excavated from both sides of the tunnel is stopped at a certain distance, and Fig. 4 shows the state of the shield machine disassembled inside. Sectional view, FIG. 5 is a side sectional view of the shield machine showing a state in which the boring device is installed in the shield machine whose interior is disassembled, and FIG. 6 is directed from one shield machine to a shield machine equipped with pressure receiving means by the boring device. Side cross-sectional view of the shield machine showing horizontal boring performed, FIG. 7 is a side cross-sectional view of the shield machine showing a state in which the tip of the boring device is in contact with the pressure receiving means, and FIG. 8 is the tip of the boring device. Of the shield machine, showing that the shield machine is propelled while retreating the car and correcting the position during that time, and Fig. 9 shows a bar for inserting the lead pipe of the boring device. A sectional view of the entrance provided in the head, FIGS. 10 (a), (b), and (c) show the tip of the lead pipe and its associated equipment, and an explanatory view for explaining a method for correcting the displacement, 11 and 12 show a second embodiment of the main part of the present invention. FIG. 11 is a front view of a position detection sensor of a shield machine, and FIG. 12 is a side sectional view thereof. G: Ground, 1,5 ... Shielding machine, 1b, 5b ... Bulkhead, 2,6 ... Cutter device, 9 ... Entrance, P ...
Pressure receiving means, P1 …… Pressure receiving part (earth pressure gauge, strain gauge), P2 ……
Container, P3 ... Rod-shaped member, P4 ... Pressure receiving part (center of gravity position measuring device), B ... Boring device, B1 ... Reed pipe, B2
...... Head, C1, C2 …… Base line,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitaro Tsuji 1-1-1, Wadasaki-cho, Hyogo-ku, Hyogo-ku, Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Kobe Shipyard (72) Inventor Shigeru Hyogo-ku, Kobe-shi, Hyogo Prefecture 1-1-1 Wadazakicho Mitsubishi Heavy Industries Ltd. Kobe Shipyard (72) Inventor Masahiko Sugiyama 1-1-1 Wadasakicho Hyogo-ku, Kobe Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Kobe Shipyard (72) Inventor Akio Niwa 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries Ltd. Kobe Shipyard (56) Reference JP-A-61-254793 (JP, A)

Claims (2)

[Claims] 1. A position detection sensor for a shield machine, which is installed in a shield machine that approaches the ground toward an excavation mine or another shield machine having a boring device installed therein, the bulkhead of the shield machine. Is provided with pressure receiving means for detecting that the tip portion of the boring device is in contact with the predetermined position, and the pressure receiving means is composed of an assembly of pressure receiving portions such as a strain gauge and an earth pressure gauge. Machine position detection sensor. 2. An assembly of rod-shaped members in which the pressure receiving means are axially slidably disposed, and the boring by being disposed on the back surface of the rod-shaped members and being pressed by the rod-shaped members. The position detection sensor for a shield machine according to claim 1, further comprising: a pressure receiving portion capable of detecting a position where the device contacts.