JPH0769178B2 - Position surveying equipment for shield-propelled excavation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a position measuring device for shield-propelled excavation.

[Conventional technology]

Conventionally, underground surveying using a transit or the like is representative of position surveying for so-called shield-propelled excavation. By performing this position measurement precisely, the error between the planned line and the construction line can be suppressed within about 2-3 cm. The error is small like this, but in actual construction, due to various reasons,
During excavation, make sure to visually measure the location of the gallery and check the relative error between the planned line and the construction line. Therefore, conventionally, such a visual position survey is generally performed using a vertical shaft. This survey is to confirm the relative position between the construction line of the tunnel and the planned line on the ground by observing the through hole in the wall of the pit that has been pierced from the planned line on the ground and piercing the shaft. is there.

[Problems to be Solved by the Invention]

However, the above-mentioned conventional technique has an advantage that it is possible to visually check the excavation accuracy directly, but for that reason, since the vertical shaft also penetrates the pit wall, if the ground is bad, muddy water or sediment from the vertical shaft into the mine And as a result,
There are drawbacks such as danger of workers, dirt in the mine, and damage to various equipment in the mine. Furthermore, the mine wall once pierced must be replenished, and this replenishment work is indispensable for construction, but it is troublesome.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to measure the position of a gallery without danger, accurately, easily, and without compensation work, for shield-propelled excavation. An object is to provide a position measuring device.

[Means for Solving the Problems]

In order to achieve the above object, a position measurement device for shield propulsion and excavation according to the present invention is provided on the outer surface of an outer wall member of a shield propulsion pit, and applies a vertical magnetic field to a vertical plane including a line parallel to the propulsion direction. A magnetic field generator to be generated, a vertical shaft that is drilled from the ground to the vicinity of the center line of the target magnetic field of the magnetic field generator, and a target magnetic field of the magnetic field generator that is provided at the tip portion of the vertical shaft. Magnetic field receiver for receiving the strength of the magnetic field, and output means for inputting the strength of the target magnetic field received by the magnetic field receiver and outputting the mutual strength difference, and various magnetic field strength differences and position values in advance. Of the correspondence data table, a conversion means for converting the magnetic field strength difference into a position value based on the correspondence data table, and a display means for displaying the position value ( Contract Invention of claim 1). In the above configuration, the magnetic field generated by the magnetic field generator may be a magnetic field in a vertical direction that is a vertical plane including a line orthogonal to the propulsion direction (the invention of claim 2), or a line parallel to the propulsion direction. And a vertical magnetic field that is a target of a vertical plane that includes a line that is orthogonal to the propulsion direction, and a magnetic field that is a vertical direction that is a target of a vertical plane that includes a line orthogonal to the propulsion direction. Invention of Item 3). Further, in the above structure, the outer wall may be a skin plate of the shield propulsion device (invention of claim 4) or a rear segment of the shield propulsion device (invention of claim 5).

[Work]

According to the configuration of claim 1, the amount of eccentricity in the horizontal direction of the tunnel due to the shield-propelled excavation is detected. That is, the magnetic field receiver is attached to the bottom of the vertical shaft that is drilled toward the center of the magnetic field generator. On the other hand, the magnetic field generator is
At the position of the outer surface of the outer wall member of the shield propulsion excavation pit,
Generate a vertical target magnetic field that is targeted to a vertical plane that includes a line parallel to the propulsion direction. The magnetic field receiver receives each of these target magnetic field intensities and outputs it to the output means. This output means outputs the strength difference of the target magnetic field. If the position of the magnetic field receiver is located to the right of the tunnel excavation direction, the magnetic field strength received by this magnetic field receiver is stronger in the right magnetic field than in the left magnetic field. The magnetic field strength difference is compared by the conversion means with a corresponding data table of various magnetic field strength differences and positions stored in advance in the storage means, converted into a value at a position corresponding to the magnetic field strength difference, and displayed by the display means. Is displayed to the operator. Next, according to the second aspect of the invention, the amount of eccentricity in the depth direction of the tunnel due to shield propulsion excavation is detected. That is, unlike the structure of claim 1, the magnetic field generator generates a target magnetic field on a vertical plane including a line orthogonal to the propelling direction. Therefore, if the tunnel is inclined forward and downward, the magnetic field strength received by this magnetic field receiver is stronger in the rear side magnetic field than in the front side magnetic field, even if the excavation direction is correct. Claim 3 is configured by combining the above two configurations. That is, the amount of eccentricity in the horizontal direction and the amount of eccentricity in the depth direction due to the shield-propelled excavation are detected. That is, in the magnetic field generator, a magnetic field targeted for a vertical plane including a line parallel to the propulsion direction and a magnetic field targeted for a vertical plane including a line orthogonal to the propulsion direction are generated in sequence. Claims 4 and 5 exemplarily show members in which the magnetic field generator is installed in the configurations of claims 1 to 3. That is, the magnetic field generator may be installed on the outer surface of the skin plate of the shield propulsion device (invention of claim 4) or on the outer surface of the rear segment of the shield propulsion device (claim 5). invention). As a result of the above construction, the shaft no longer penetrates the shield wall.

〔Example〕

A preferred embodiment of the position measuring device for shield-propelled excavation according to the present invention will be described below with reference to the drawings. The figure is a diagram showing a schematic configuration of all the embodiments of the present invention, the construction line C2 of the shield machine 70 that has been excavated is the planned line C1 on the ground 10
It is a figure which measures what kind of position it sees. In the first embodiment, the magnetic field generator 40 is fixedly mounted on the outer surface of the skin plate 71 of the shield propulsion device 70 in FIG. This magnetic field generator 40 has a construction line C2 that is a line parallel to the propulsion direction.
Is formed by a rectangular loop coil having a vertical plane as a center and a propelling direction as a longitudinal direction. By applying a constant current to this rectangular loop coil, two symmetrical magnetic fields are formed in the vertical direction centering on the vertical plane including the construction line C2. A shaft 20 is drilled from the reference point S on the planned line C1 on the ground 10 toward the center of the target magnetic field of the magnetic field generator 40 by using a boring machine. This shaft
The tip end of 20 and the center of the magnetic field generator 40 strike against each other with an error of about 2 to 3 cm due to a conventional measurement such as transit. A magnetic field receiver 30 is fixedly installed on the bottom of the vertical shaft 20 at a position separated from the tip by a predetermined distance δ. The magnetic field receiver 30 in the present embodiment has a configuration in which two coils are orthogonal to each other in a vertical plane orthogonal to the propelling direction, and is arranged along the magnetic flux generated by the magnetic field generator 40. . This magnetic field receiver 30
Further, via the lead wire, with the microcomputer 50 on the ground 10 and CR
It is connected to the T-display 60. The tip of the vertical shaft 20 will just hit the center of the magnetic field generator with an error of ± 2 to 3 cm in the upper, lower, left, and right directions. By the way, the present invention (the present embodiment) can accurately measure the amount of eccentricity in the horizontal direction regardless of the presence or absence of these errors. That is, if the vertical shaft 20, that is, the magnetic field receiver 30,
When located on the right side with respect to the propulsion direction (that is, when the tunnel construction line C2 is eccentric to the left with respect to the planned line C1 on the ground), the magnetic field generator 40 generates the left and right target magnetic fields,
The magnetic field strength of the receiving magnetic field receiver 30 is stronger on the right side than on the left side. Each received magnetic field strength is sent to the microcomputer 50, and after each strength difference is calculated, various magnetic field strength differences and positions stored in advance by the ROM (in this embodiment, it is a length but may be a declination angle). ) Is compared with the corresponding data table with, and the intensity difference is converted into a position value. The position value is then displayed on the CRT display. The display according to the present embodiment displays a simple eccentric length mm and a bird's-eye view. That is, if there is no difference between the left and right magnetic field strengths,
The eccentricity is zero, but if there is a difference in the left and right magnetic field strengths, the eccentricity is displayed as the position quantity. In this embodiment, the microcomputer 50 integrates the output means (4), the storage means (5), and the conversion means (6) described in the claims. Second
In the example, the magnetic field generator 40 generates a magnetic field of interest in a vertical plane orthogonal to the propulsion direction line. That is, the magnetic field generator 40 uses a loop coil as in the first embodiment, but is provided so that its longitudinal direction is orthogonal to the propulsion direction line.
By applying a constant current to it, two symmetrical magnetic fields are generated in the vertical plane, which is orthogonal to the direction of propulsion. On the other hand, the two coils forming the magnetic field receiver 40 are configured to be orthogonal to each other in the vertical plane in the propulsion direction. The other structure in this embodiment is the same as that of the first embodiment. However, in this case, the value displayed on the display means is the inclination in the propulsion direction of the shield propulsion excavation. The third embodiment is a combination of the first embodiment and the second embodiment. In this case, two rectangular loop coils serving as the magnetic field generator 40 are prepared, one whose longitudinal direction is in the direction of propulsion and the other in a direction perpendicular to the direction of propulsion. In this case, no current is applied to these two rectangular loop coils at the same time. This is because if the current is applied to the two rectangular loop coils at the same time, the two magnetic fields are combined and the eccentricity cannot be measured. The magnetic field receiver 30 in this case is aligned with the above-mentioned magnetic field generator 40, one set of two coils is arranged in a vertical plane orthogonal to the propulsion direction, and the other set is arranged in a vertical plane of the propulsion direction. It consists of two sets of coils arranged. As another example, the magnetic field generator 40 may be not only the outer surface of the skin plate of the shield thruster as in the above embodiment, but also the outer surface of the rear segment of the shield thruster. That is, it may be installed anywhere as long as it is located on the outer surface of the outer wall member of the shield-propelled digging pit and is a known position. Also,
If the magnetic field generator 40 has the structure of claim 1 or claim 2, the magnetic field generator 40 need not be a rectangular loop coil as in the above embodiment, but may be a permanent magnet. According to the above embodiment, it is not possible to visually check the excavation accuracy directly, but since the vertical shaft does not break through the pit wall as in the conventional case, even if the ground is bad, etc., from the vertical shaft to the underground No muddy water or sediment will enter. As a result, it does not promote worker danger, dirt inside the mine, and damage to various equipment inside the mine. Of course, it becomes possible to eliminate the conventional compensation work. In addition, since a simple and easy-to-use index for simply comparing and detecting the target magnetic field strength is used, it is possible to expect a highly accurate position measurement device for shield propulsion and excavation. It should be noted that it is easy to measure the entire tunnel by using the present invention (this embodiment). That is, the position of the magnetic field receiver 30 is the planned line C1 and the reference point S on the ground.
Easily found from. The depth l ₁ is the length obtained by subtracting the position δ of the magnetic field receiver 40 from the boring length. On the other hand, the position of the magnetic field generator 40 is also known from the construction line. Therefore, the total survey can be easily performed by adding the position data, which is the display value based on the present invention, to them.

〔The invention's effect〕

As described above, according to the position surveying apparatus for shield-propelled excavation according to the present invention, the position surveying using a vertical shaft is no different from the conventional technique, but the magnetic field generator provided on the outer surface of the pit wall is used. Since the target magnetic field due to is detected by a magnetic field transmitter inside the shaft, these are compared, and the data is converted into position data and displayed, a simple and reliable configuration is adopted.
Unlike a conventional shaft, the shaft does not penetrate through the wall of the shaft, so that even if the ground is bad, muddy water or sediment does not enter the shaft from the shaft. As a result, it does not promote worker danger, dirt inside the mine, and damage to various equipment inside the mine. Of course, it becomes possible to eliminate the conventional compensation work. Moreover, since a simple and easy-to-use index for simply comparing and detecting the target magnetic field strength is used, it can be a highly accurate position measurement device for shield-propelled excavation.

[Brief description of drawings]

The drawing is a perspective view of shield-propelled excavation, and is a schematic configuration diagram of a position-measuring device for shield-propelled excavation according to the present invention. 10 …… Ground 20 …… Vertical shaft 30 …… Magnetic field receiver 40 …… Magnetic field generator 50 …… Microcomputer 60 …… CRT display 70 …… Shield machine 71 …… Skin plate C1 …… Plan line C2 …… Construction line S: reference point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Shinbo 1200 Manda, Hiratsuka, Kanagawa Komatsu Seisakusho Co., Ltd. Researcher Keishin Terayama (56) References JP-A-55-142898 (JP, A) Kai 63-171996 (JP, A) JP 62-190412 (JP, A) JP 62-247207 (JP, A)

Claims (5)

[Claims] 1. A magnetic field generator which is provided on the outer surface of an outer wall member of a shield propulsion pit and which generates a vertical magnetic field in a vertical plane including a line parallel to the propulsion direction. A vertical shaft that is drilled toward the center line of the target magnetic field of the magnetic field generator to the vicinity thereof, and (3) a magnetic field that is provided at the tip portion of the vertical shaft and that receives the respective strengths of the target magnetic field of the magnetic field generator. A receiver, and (4) output means for inputting each of the strengths of the target magnetic fields received by the magnetic field receiver and outputting a mutual strength difference, (5) various magnetic field strength differences and position values in advance (6) conversion means for converting the magnetic field intensity difference into a position value based on the correspondence data table; and (7) display means for displaying the position value. , A seal characterized by the above configuration Position measurement device for propulsion and excavation. 2. The position surveying device for shield propulsion excavation according to claim 1, wherein the magnetic field generated by the magnetic field generator is a magnetic field in a vertical direction which is a vertical plane including a line orthogonal to the propulsion direction. . 3. The magnetic field generated by the magnetic field generator is a magnetic field in a vertical direction which is a target of a vertical plane including a line parallel to the propulsion direction and a magnetic field in a vertical direction which is a target of a vertical plane including a line orthogonal to the propulsion direction. 2. The position surveying device for shield propulsion excavation according to claim 1, wherein these magnetic fields are generated one after another. 4. The position surveying device for shield-propelled excavation according to claim 1, 2 or 3, wherein the outer wall is a skin plate of the shield-propelled machine. 5. The position surveying device for shield propulsion excavation according to claim 1, claim 2, claim 3 or claim 4, wherein the outer wall is a segment behind the shield propulsion machine.