JPS63304894A - Position sensing method of shielding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a method of detecting the position of a shield machine that excavates underground. The present invention relates to a shield machine position detection method for confirming the positions of each shield machine when excavating from both sides.

"Conventional technology" Conventionally, the position detection method for this type of shield machine is to drop the line of the shield tunnel on the ground through an observation hole into the tunnel excavated by the shield machine, and check the tunnel baseline. Or, when excavating a tunnel under the seabed, a starting shaft is excavated at both ends of the tunnel, and using this as a reference, the direction and distance are measured using Gyro 1 Transit, etc., and the direction and distance are measured from here to the set planning reference line. A method is known in which the mutual positions of excavated wells are determined by matching them.

"Problems to be Solved by the Invention" However, in the conventional method for detecting the position of a shield machine, the method using an observation hole cannot drill an observation hole (
For example, it cannot be used when excavating in urban areas or under the seabed, etc., and methods using gyros or transits may cause measurement errors, especially when excavating from both sides of a tunnel under the seabed. In cases where measurement errors are unacceptable, such as when two shield machines that have been dug together are to be joined, there is a problem in that it is not possible to join the shield machines with high accuracy using this method alone.

The present invention has been made in view of the above problems, and provides a method for detecting the position of a shield machine that can accurately and reliably measure the position of the shield machine by a relatively simple method without providing an observation hole. is intended to provide.

"Means for solving the problem" This invention stops a shield machine at a position where the orbit can be corrected, and directs the shield machine toward a pressure receiving means provided at the front part of the shield machine, such as an excavation pit or other shield machine. Horizontal boring is performed using a boring device from inside the device, and by bringing the tip of the boring device into contact with a predetermined location of the pressure receiving means, the position of the shield machine can be determined from the positional relationship between the contact point and the base line of the shield machine. The above problem is solved by detection.

Furthermore, after confirming the position of the shield machine by bringing the tip of the boring device into contact with the pressure receiving means, the tip of the boring device is moved back a predetermined distance, and the trajectory of the shield machine is corrected by that distance. It is desirable to sequentially repeat the steps of moving the boring device forward, then stopping it, and again bringing the tip of the boring device into point contact with the pressure receiving means of the shielding machine to detect the position.

"Example" The present invention will be explained below with reference to the drawings.

Figures 1 to 10 are diagrams for explaining an embodiment of the position detection method of a shield machine according to the present invention. When constructing a tunnel under the seabed, the tunnel is excavated from both sides and joined in the middle. This figure shows how to detect the position of the shield machine when

In the figure, symbol G is the ground near the junction of the shield tunnel excavated from both ends, and within this ground G, the first shield machine l excavates the tunnel Ta on the right side of the page. , the second shield machine 2 is on the left side with respect to the page.
is excavating tunnel Tb. The outer shape of the shield machine 1 is formed by a cylindrical skin plate 1a and a bulkhead lb fixed to the front part thereof, and a cutter device 2 is installed in the center of the bulkhead Ib.

Further, inside the skin plate la, a plurality of shield jacks 3 are arranged at predetermined intervals in the circumferential direction, and inside the bulkhead 1b, there are screws for discharging earth and sand taken into the cutter frame from the face. A conveyor 4 is installed, and a pressure receiving means P is provided at a predetermined location on the bulkhead tb. As shown in FIGS. 9 and 10, the pressure receiving means P includes pressure receiving parts Pl, Pi, etc., such as strain gauges and earth pressure gauges, in a container P2 having a predetermined shape, with the surface of the pressure receiving part P1 being flat. The container P2 is fixed to the bulkhead tb, and the pressure receiving part PI,
P1. A cable k is disposed to transmit the detection signals of ... to a detection device disposed at a predetermined location within the shield machine l.

Each pressure receiving part PI, PI, . . . of the pressure receiving means P is
The positional relationship between the shield machine 1 and the baseline Ct is set accurately.

Similarly, the second shield machine 5 has an outer shape formed by a cylindrical skin plate 5a and a bulkhead 5b fixed to the front part thereof, and a cutter device 6 is installed in the center of the bulkhead 5b. ing. Further, a plurality of shield jacks 7 are arranged inside the skin plate 5a, and a screw conveyor 8 is installed inside the bulkhead 5b, and a screw conveyor 8 is installed at a predetermined location of the bulkhead 5b (base line of the shielding machine 5). An entrance 9 for inserting a lead pipe of a boring machine, which will be described later, is installed at a location where the positional relationship with C2 is similar to the positional relationship between the pressure receiving means P and the base line Ct. The entrance 9 is connected to the bulkhead 5 as shown in FIG.
A pipe lO fixed inside b, a gate valve 11 attached to this pipe 10, a packing 12 arranged inside the end of the pipe lO, and a slide slidably fitted to the pipe 10. It is composed of a packing 13 and the like.

The shield machines 1.5 having the above configuration are each carried in from separate starting shafts near both ends of the tunnel, and
While performing one-sided push baseline sidecar, the ground G under the seabed is being cut toward the joint point by the cutters 2 and 6 in front of each other, and is propelled by driving the jack 3.7. . Then, the tunnel to be constructed is excavated from both sides to the vicinity of the joining point, and as shown in Fig. 1, the shield machine 5 reaches the planned position, and the shield machine I moves to the planned position (a position approximately 50 m to 100 m away). ), stop the shield machine.

Next, as shown in FIG. 2, after disassembling the inside of the shield machine Tb with the gap formed in the cutter device 6 aligned with the position of the entrance 9, as shown in FIG. Boring device B is placed at a predetermined position inside machine Tb.
Set up. At this time, the base line Bc of the lead pipe Bl of the boring machine B is aligned to be parallel to the base line C2 of the shield machine 5. In addition, inside the lead pipe Bl,
As shown in FIG. 8, a head B2 with a triangular longitudinal section is installed, and on the back of the head B2 there is a correction direction that can be seen on the transit B3 from the end of the lead pipe B1 on the shield machine 6 side. An indicator lamp B4 is provided, and the transit B3 is further provided with a monitor camera B5 for displaying the image on a television (not shown). Then, as shown in FIG. 4, the gate valve 11 is opened from the entrance 9 of the bulkhead 5b, and the lead pipe Bl of the boring machine B is inserted therethrough, and the boring machine B is driven.

Then, the lead pipe Bl is inserted through the gap in the cutter device 6, and horizontal boring is performed toward the pressure receiving means P of the shielding machine I stopped at the planned arrival position. When performing boring, the user rotates the head B2 to dig into the ground G, and proceeds with the work while checking whether the correction direction indicator lamp B4 displayed on the television is out of position using the monitor camera B5. Then, as shown in FIG. 8(a), if the position of the correction direction indicator lamp B4 deviates from the center of the transit B5, indicating that the lead pipe Bl has been displaced,
), the head B2 is rotated in accordance with the correction direction and propelled in this state. By doing so, head B
2 receives a reaction force from the ground G and its displacement is corrected. After the correction is made, boring is performed again using the lead pipe Bl while rotating the head B2, as described above.

Then, as shown in FIG. 5, when the head B2 of the lead pipe Bl passes through the gap in the cutter device 2 and comes into contact with a predetermined pressure receiving part P1 of the pressure receiving means P, a change in current occurs in the pressure receiving part PI. , this is transmitted to a detection device (not shown) in the shield machine 1 via a cable k. As a result, it is possible to know how far the tip of the lead pipe Bl has come into contact with the base line Ct of the shield machine L, and to
Measured baseline C2 of shield machine 5 and lead pipe Bl
Check the relative position of the baselines CI and C2 of the shield machine 1.5 from the position with the base line Be of the shield machine 1.5 and the positional relationship between the base line CI of the shield machine 1 and the point where the head 2 of the lead pipe Bl contacts Can be done.

The extent to which the tip of the lead pipe B1 is deformed from the base line Bc can be detected by the deviation of the correction direction indicator lamp B4. Furthermore, in order to detect the accurate position of the tip (head B2) of the lead pipe Bl, from the end of the lead pipe Bl on the shield machine 5 side,
Measurement may also be performed using a laser beam.

Next, after confirming the relative position of the shield machine 1.5 by bringing the tip of the boring device B into contact with the pressure receiving part PI of the pressure receiving means P, the lead pipe B1 is retreated by a predetermined distance. Then, after moving forward while correcting the trajectory of the shield aircraft l by that distance, it is stopped, and again,
The tip of the lead pipe B1 is brought into point contact with the pressure receiving means P of the shield machine 1 to confirm the relative position of the shield machine 1.5.

Similarly, by repeating the above steps, the shield machine 1 is gradually brought closer to the shield machine 5 while correcting its trajectory, and finally the baseline CI and 02 are made to coincide.

Note that the distance to which the lead pipe B1 is retreated is determined by the number of rings in the segment, and is determined by the number of rings of the shield machine 1.5.
It is desirable to reduce the number of rings, that is, to shorten the retreating distance as the distance approaches, to improve measurement accuracy. Further, by bringing the lead pipe Bl into point contact, the work of confirming the relative position of the shield machine 1.5 is performed within the time for assembling the segments.

As described above, the present invention allows the shield machines 1 and 5 to be stopped at positions where the orbits can be corrected, and at the same time, the boring device is moved from the inside of the shield machine 5 toward the pressure receiving means P provided in the bulkhead tb of the shield machine 1. By performing horizontal boring using B and bringing the tip of the lead pipe B1 of the boring device B into contact with one of the pressure receiving parts pt of the pressure receiving means P, the shield can be removed from the positional relationship between the contact point and the baseline CI of the shielding machine Since the relative position of the shield machine 5 with respect to the baseline C2 is detected, there is no need to provide an observation hole in the ground G for measurement, and the position of the shield machine can be accurately and reliably detected relatively easily. It is possible to measure and achieve highly accurate shield machine joining. Therefore, it is possible to realize a significant reduction in construction costs, and this method is particularly suitable for use in tunnel connections in urban areas, under the seabed, etc.

In addition, since the position of the shield machine can be measured during the time it takes to assemble the segments after the shield machine is propelled, it will not cause delays in tunnel construction.

Note that other embodiments or technical matters other than those described above will be described below.

(i) The pressure receiving means P is not limited to the one shown in the above embodiment, but may be of any type as long as it can confirm that the tip of the boring device has made point contact.

(11) In the above embodiment, two shield machines were connected in the middle of the tunnel, but
However, the present invention is not limited to this, but can also be applied when one shield machine reaches a reaching shaft.

(Mountain) In the embodiment described above, the pressure receiving device is attached to the bulkhead, but the pressure receiving device is not limited to this, and may be attached to, for example, the face plate of a face plate type cutter or the slit opening/closing device.

"Effects of the Invention" As described above, the present invention not only stops the shield machine at a position where the orbit can be corrected, but also directs the shield machine toward the pressure receiving means provided at the front of the shield machine, such as in an excavation pit or other shield machine. Horizontal boring is performed from inside using a boring device, and by bringing the tip of the boring device into contact with a predetermined location of the pressure receiving means, the position of the shielding machine is detected from the positional relationship between the contact point and the base line of the shielding machine. Since it is designed to do so, there is no need to create an observation hole for measurement in the ground, and the position of the shield machine can be measured accurately and reliably with relative ease, allowing for high-precision shield machine joining. can be realized. Therefore, it is possible to achieve a significant reduction in construction costs, and this method is particularly suitable for use in tunnel connections in urban areas, under the seabed, etc.

[Brief explanation of drawings]

Figures 1 to 6 are diagrams for explaining the present invention in detail, and Figure 1 shows a shield machine that has dug from both sides of a tunnel and has stopped at a predetermined distance. 2 is a sectional view of the shield machine showing a state in which the inside of one of the shield machines has been dismantled; FIG. 3 is a sectional view of the shield machine showing a state in which a boring device is installed in the shield machine with the inside dismantled; Figure 4 is a cross-sectional view of the shield machine showing horizontal boring from one shield machine to a shield machine equipped with pressure receiving means using a boring device, and Figure 5 shows the tip of the boring device hitting the pressure receiving means. A cross-sectional view of the shield machine showing the contact state, Figure 6 is a cross-sectional view of the shield machine showing the tip of the boring machine being retreated and the shield machine being propelled while adjusting the position, and Figure 7 is a boring machine. Figure 8 (a), (b), and (c) are cross-sectional views of the entrance provided in the bulkhead for inserting the lead pipe of the device, showing the tip of the lead pipe and its ancillary equipment, and correcting the displacement. FIG. 9 is a front view of the pressure receiving means, and FIG. 10 is a side sectional view thereof.

Claims (2)

[Claims] (1) A method for detecting the position of a shield machine digging underground, in which the shield machine is stopped at a position where the orbit can be corrected, and the shield machine is directed toward a pressure receiving means provided at the front of the shield machine, By performing horizontal boring using a boring device from inside an excavation pit or other shielding machine, and bringing the tip of the boring device into contact with a predetermined location of the pressure receiving means, the positional relationship between the contact point and the base line of the shielding machine is determined. A method for detecting the position of a shield machine, characterized in that the position of the shield machine is detected from the position of the shield machine. (2) After confirming the position of the shield machine by bringing the tip of the boring device into contact with the pressure receiving means, move the tip of the boring device back a predetermined distance, and move the shield machine along the orbit by that distance. The shield according to claim 1, wherein the step of moving the shield forward while making corrections, stopping it, and again bringing the tip of the boring device into point contact with the pressure receiving means of the shield machine to detect the position is repeated in sequence. How to detect the position of the machine.