Detector

Abstract

To provide a detector that enables early detection of segment movement with a simple configuration.SOLUTION: A detector 1 for detecting the movement of an arcuate plate-like segment to a tunnel inner space side comprises contact sensor parts 2 that is placed across the boundary of a K segment P1 and detects the movement of the K segment to the tunnel inner space side T3 by contact when the movement is more than or equal to a specified value, a light 3 for notifying contact detection by the contact sensor part, a control circuit part 4 for controlling the contact sensor parts and the light, and a power supply part 5.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a detection device that detects the movement of a circular arc-shaped plate segment toward the interior space of a tunnel. [Background technology]

[0002] A shield tunneling method is known in which a cylindrical tunnel lining is assembled by joining multiple arc-shaped plate segments in the tunnel circumferential direction to form rings, and then joining the rings together in the tunnel axial direction.

[0003] In this shield method, among the multiple segments assembled in the circumferential direction of the tunnel, the last segment to be connected is sometimes called the "K segment." There are two methods for installing this K segment: the transverse section closure method and the axial insertion closure method. In the transverse section closure method, the K segment is moved radially from the inside of the tunnel and connected to the adjacent segments on both sides (see Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-48534 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the K-segments that are fitted between the segments by moving radially from the inside of the tunnel may be pushed out into the tunnel due to deformation of the ground around the tunnel. Such movement of the segments may lead to the segments becoming dislodged, so it is desirable to detect this as early as possible and take measures to prevent it.

[0006] Therefore, an object of the present invention is to provide a detection device that can detect segment movement early with a simple configuration. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the detection device of the present invention is a detection device that detects the movement of an arc-shaped segment toward the empty side of the tunnel, and is characterized in that it comprises a contact sensor unit that is arranged across the boundary of the segment and detects by contact the movement of the segment toward the empty side of the tunnel of more than a predetermined value, an alarm unit that alarms the contact detection by the contact sensor unit, a control circuit unit that controls the contact sensor unit and the alarm unit, and a power supply unit.

[0008] Here, the contact sensor unit can be configured to have a base provided on a segment adjacent to the segment to be detected in the tunnel circumferential direction, and an arm portion extending from the base toward the edge of the segment to be detected.

[0009] In addition, the arm portion can be positioned at a position away from the edge portion toward the interior space of the tunnel, and can be equipped with a resistor whose resistance changes upon contact, and when a change in the resistance value of the resistor is detected by the control circuit portion, an alarm is issued by the alarm portion.

[0010] Further, it is preferable that the contact sensor unit is disposed at each of the edges of the segment to be detected in the circumferential direction of the tunnel. Also, it is preferable that the notification unit is a light that is turned on when the control circuit unit detects contact. Effect of the Invention

[0011] The detection device of the present invention thus configured comprises a contact sensor unit that detects, by contact, movement of the segment toward the interior of the tunnel of more than a predetermined value, and an alarm unit that notifies of the thus detected contact.

[0012] Therefore, if there is a movement in a segment that could be considered a sign of an escape, this simple configuration can detect it early, and the notification unit can make it easy for the administrator to recognize.

[0013] For example, if a base is provided on a segment adjacent to the segment to be detected and an arm portion is extended from the base and made to come into contact with the arm portion, the amount of protrusion into the tunnel interior will be small, making the device less likely to break.

[0014] In addition, if the device uses a resistor whose resistance changes upon contact, it can function stably even in the humid environment of a tunnel. Furthermore, if the contact sensor units are placed on both sides of the tunnel circumference, it can detect the movement of only one edge. And if the notification unit is a light that turns on when contact is detected, inspectors can easily visually check the segment to be detected even if it is placed at a high place. [Brief description of the drawings]

[0015] [Figure 1] 1 is an explanatory diagram illustrating a schematic configuration of a detection device according to an embodiment of the present invention; [Diagram 2] FIG. 4 is an explanatory diagram showing an enlarged view of the periphery of a contact sensor unit; [Diagram 3] 11 is an explanatory diagram illustrating an example of the arrangement of contact sensors in the circumferential direction of a tunnel. FIG. [Figure 4] 5A and 5B are explanatory diagrams illustrating contact detection by a contact sensor unit. [Diagram 5] 11 is an explanatory diagram illustrating an example of the arrangement of contact sensors in the tunnel axial direction; FIG. [Figure 6] 1 is a flowchart illustrating a flow of maintenance and inspection of a railway tunnel using the detection device of this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view for explaining a typical configuration of a detection device 1 according to the present embodiment. Fig. 2 is an explanatory view showing an enlarged view of the periphery of a contact sensor unit 2.

[0017] Tunnels excavated by shield machines have a cylindrical lining (outer shell) formed by combining arc-shaped plate-shaped components called segments, as shown in Figure 1. In the following, the arc direction of the cylindrical tunnel is referred to as the tunnel circumferential direction T1, and the direction in which the tunnel extends is referred to as the tunnel axial direction T2.

[0018] There are three types of segments: steel segments made of steel, RC segments made of reinforced concrete, and composite segments formed by integrating steel and concrete. RC segments are made of reinforced concrete and formed into arc-shaped plates. Composite segments, on the other hand, are formed by using a steel skin plate on the outer periphery of the tunnel, forming the periphery of the skin plate into a wall, and filling the box-shaped interior with concrete.

[0019] The multiple segments are joined in the tunnel circumferential direction T1 to assemble them into a ring, and the rings are joined together in the tunnel axial direction T2 to form a cylindrical tunnel lining. Among the multiple segments assembled in the tunnel circumferential direction T1, the last segment to be connected is called the K segment P1.

[0020] In this embodiment, a method for installing the K-segment P1 in the cross-sectional closure method will be described. That is, in the cross-sectional closure method, the K-segment P1 is moved radially from the tunnel inner space T3 and fitted between the adjacent segments P2, P2 on both sides. Then, by fitting the K-segment P1, the segments P2, P2 are connected to each other to complete the ring.

[0021] In this embodiment, the detection target is the K segment P1 that is connected last. A joint, which is a boundary P3, is formed between the K segment P1 and the segment P2 adjacent to the K segment P1 in the tunnel circumferential direction T1.

[0022] The joints are staggered so that they do not continue between rings in the tunnel axial direction T2. ​​Therefore, the position of the K segment P1 in the tunnel circumferential direction T1 is not constant in the tunnel axial direction T2, but in this embodiment, the position of the K segment P1 illustrated in FIG.

[0023] The detection device 1 of this embodiment includes a contact sensor unit 2 that detects movement of the segment toward the tunnel interior space side T3 by contact of more than a predetermined value, an alarm unit (3) that notifies the contact detection by the contact sensor unit 2, a control circuit unit 4 that controls the contact sensor unit 2 and the alarm unit, and a power supply unit 5.

[0024] 2 is an explanatory diagram showing an enlarged view of the periphery of the contact sensor unit 2. The main body of the contact sensor unit 2 is formed by a base 21 fixed to a segment P2 adjacent to the K segment P1 to be detected in the tunnel circumferential direction T1, and an arm portion 22 extending from the base 21 toward the edge of the K segment P1.

[0025] The body of the contact sensor unit 2 is fabricated into a Z-shape in side view by processing a metal plate such as stainless steel. The base 21 is fixed to the segment P2 from the tunnel interior space side T3 by a post-installed anchor 24 or the like.

[0026] Meanwhile, a resistor 23, the resistance of which changes upon contact, is disposed on the arm 22 extending from the base 21. For example, the resistor 23 is attached to the upper surface of the arm 22 facing the inner circumferential surface P11 of the K segment P1.

[0027] Any material can be used for the resistor 23 as long as the resistance changes when the K segment P1 moves and comes into contact with it and a compressive force acts on it. For example, the resistor 23 can be made of a synthetic resin with a high molecular weight, such as a conductive polymer.

[0028] A distance is ensured between the inner circumferential surface P11 of the K segment P1 and the resistor 23 when the contact sensor unit 2 is installed. Since what is desired to be detected by the detection device 1 is a movement that can be considered a sign of the K segment P1 coming out, a distance of, for example, about 5 mm is ensured so that an alarm is not issued for a movement smaller than that.

[0029] Resistor 23 is connected to control circuit section 4 by connection cable 41. That is, a circuit is formed between control circuit section 4 and resistor 23, and a change in the resistance value of resistor 23 is detected by control circuit section 4. For example, when the resistance value of resistor 23 increases due to contact, the control circuit section 4 detects a delay in the time until a predetermined voltage is reached, and when that delay time exceeds a predetermined value, it is detected as having made contact.

[0030] 1 and 3 show an example of a configuration in which two contact sensor units 2, 2 are connected to one control circuit unit 4, and the contact sensor units 2, 2 are disposed at two edges on both sides of the K segment P1 in the tunnel circumferential direction T1. In this manner, the contact sensor unit 2 is disposed across the boundary P3 between the K segment P1 and the adjacent segment P2.

[0031] In addition to the contact sensor unit 2, a light 3 serving as a notification unit is connected to the control circuit unit 4. When the control circuit unit 4 detects a change in the resistance value of the resistor 23 that is equal to or greater than a predetermined value, the digital output signal is turned on and the light 3 is lit up.

[0032] Furthermore, a power supply unit 5 is connected to the control circuit unit 4 via an electric wire 51. A battery, a storage battery, or the like can be used as the power supply unit 5. When a battery or the like is used as the power supply unit 5, the detection device 1 can be easily installed in any location. Furthermore, in locations where it is relatively easy to receive power from wiring, the power supply unit 5 can also be connected to wiring in a tunnel.

[0033] Fig. 4 is an explanatory diagram showing a schematic diagram of contact detection by the contact sensor unit 2. When the contact sensor unit 2 is arranged with respect to the K-segment P1 as shown in Fig. 3, if the load acting on the K-segment P1 increases due to loosening of the ground on the rear side of the K-segment P1, and the K-segment P1 moves toward the tunnel interior side T3, the inner circumferential surface P11 comes into contact with the contact sensor unit 2.

[0034] For example, when the K segment P1 moves approximately 5 mm toward the tunnel interior space T3, the inner surface P11 comes into contact with the contact sensor unit 2, and when it moves further toward the tunnel interior space T3, the resistor 23 is pushed by the inner surface P11, causing the resistance value of the resistor 23 to change.

[0035] The resistance value of this resistor 23 is successively checked by the control circuit unit 4, and if there is a change of a predetermined value or more, it is determined that contact has been detected. If contact has been detected, a current flows through the light 3, causing it to light up.

[0036] Such a detection device 1 can be installed for all K segments P1 along the entire length of the tunnel, but the detection range can also be narrowed down. Figure 5 is an explanatory diagram illustrating an example of the arrangement of the contact sensor unit 2 in the tunnel axis direction T2.

[0037] The possibility of the K-segment P1 slipping out is not uniform in all sections of the tunnel, but is more likely to occur in sections with harsh ground conditions, such as when the ground around the tunnel is soft. Therefore, the contact sensor unit 2 can be arranged only for the K-segment P1 in sections with harsh ground conditions.

[0038] In this case, a detection device 1 can be configured for each pair of contact sensor units 2 arranged in the tunnel circumferential direction T1. Also, a common control circuit unit 4, light 3, and power supply unit 5 can be used for the contact sensor units 2 arranged at an interval in the tunnel axial direction T2.

[0039] Next, a method of using the detection device 1 of this embodiment will be described. FIG. 6 is a flow chart illustrating a flow of maintenance and inspection of a railway tunnel using the detection device 1 of this embodiment.

[0040] First, in step S1, the K segment P1 to be detected by the detection device 1 is identified. For example, as shown in Fig. 5, if a section with severe ground conditions is known within the entire length of the tunnel, that section is identified as the installation section.

[0041] Next, in step S2, the detection device 1 is installed in the specified installation section for the K segment P1 to be detected. For example, as shown in Fig. 1, the contact sensor unit 2 is placed on each of two edges in the tunnel circumferential direction T1 of the K segment P1 near the apex of the tunnel.

[0042] Then, the connection cable 41 extending from the contact sensor unit 2 is wired to the control circuit unit 4 attached to the segment adjacent to the K segment P1 in the tunnel axial direction T2. ​​The light 3, which serves as the notification unit, is also connected to the control circuit unit 4. Furthermore, the end of the electric wire 51 extending from the control circuit unit 4 is connected to the power supply unit 5 attached to the segment near the leg of the tunnel.

[0043] After the detection device 1 is thus installed on the K-segment P1, maintenance and inspection of the railway tunnel can be carried out as usual. When the K-segment P1 moves by a predetermined amount or more and the contact is detected by the contact sensor unit 2, the digital output signal is turned on in the control circuit unit 4, and the light 3 is turned on (step S3).

[0044] The inside of a tunnel is usually dark with few lights, but when light 3 is turned on, an inspector can confirm that light 3 is on when driving a maintenance vehicle or patrolling on foot, even near the top of the tunnel (step S4).

[0045] After the illumination of Light 3 is confirmed, we will go to the site as soon as possible and conduct a detailed investigation to determine whether there is actually movement in K segment P1, whether it is a sign of an escape, etc. Then, based on the results of that investigation, we will formulate an appropriate countermeasure plan.

[0046] Next, the operation of the detection device 1 of this embodiment will be described. The detection device 1 of this embodiment, configured as described above, is equipped with a contact sensor unit 2 that detects movement of the segment toward the tunnel interior space T3 by contact, which exceeds a predetermined value, and a light 3 that serves as an alarm unit that notifies of the contact detection thereby.

[0047] Therefore, if there is any movement in the K segment P1 that could be considered a sign of an escape, this simple configuration can detect it early and make it easy for the manager to recognize by turning on light 3. Furthermore, until light 3 turns on, no regular measurements are required, which reduces the burden of maintenance.

[0048] Furthermore, if a base 21 is provided on segment P2 adjacent to the K segment P1 to be detected, and an arm portion 22 is extended from the base 21 so that the inner surface P11 comes into contact with the arm portion 22, the amount of protrusion into the tunnel interior T3 is small and there is no interference with the construction limit.

[0049] Furthermore, if the device uses resistor 23 whose resistance changes upon contact, it can function stably even in the humid environment of a tunnel. In other words, it can be made into a simple device that is not easily broken.

[0050] Furthermore, if the contact sensor units 2 are arranged on both sides in the tunnel circumferential direction T1, movement of only one edge can be detected, leading to early discovery and early inspection.

[0051] Furthermore, if the alarm unit is a light 3 that turns on upon contact detection, even if the K segment P1 to be detected is located at a high position, an inspector can easily visually confirm it when patrolling on foot, for example.

[0052] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention. For example, in the above embodiment, a cylindrical tunnel was used as an example, but this is not limited to this, and the present invention can be applied to any tunnel constructed by combining segments, such as an elliptical or rectangular cylindrical tunnel.

[0053] In addition, in the above embodiment, the K segment P1 is described as the detection target, but this is not limited to this, and any segment that may move can be the detection target of the detection device 1.

[0054] Furthermore, in the above embodiment, the light 3 is described as the notification unit, but this is not limited to this, and the notification unit can also be a speaker unit that generates a buzzer sound, or a transmission means that notifies the occurrence of contact detection by email, etc.

[0055] In addition, in the above embodiment, a configuration has been described in which a pair of contact sensor units 2 are arranged on both sides of the K segment P1 in the tunnel circumferential direction T1, but this is not limited to this, and any number of contact sensor units 2 can be arranged on the four edges of the K segment P1. [Explanation of symbols]

[0056] 1: Detection device 2: Contact sensor section 3: Light (notification section) 4: Control circuit section 5: Power supply section 21: Base 22: Arm section 23: Resistor P1: K segment (segment to be detected) P2: Segment (adjacent segment) P3: Boundary T1: Tunnel circumferential direction T3: Inside the tunnel

Claims

1. A detection device that detects the movement of an arc-shaped segment toward the inside of a tunnel, a contact sensor unit disposed across the boundary between the segments and configured to detect, by contact, a movement of the segment toward the interior of the tunnel of a predetermined value or more; a notification unit that notifies a contact detection by the contact sensor unit; A control circuit unit that controls the contact sensor unit and the notification unit; A detection device comprising:

2. The contact sensor unit includes: a base portion provided on a segment adjacent to the segment to be detected in the circumferential direction of the tunnel; The detection device according to claim 1 , further comprising an arm portion extending from the base toward an edge of the segment to be detected.

3. The arm portion is disposed at a position spaced from the edge portion toward the interior space of the tunnel, and includes a resistor whose resistance changes upon contact, 3. The detection device according to claim 2, wherein when the change in the resistance value of the resistor is detected by the control circuit, the notification unit issues a notification.

4. 4. The detection device according to claim 2, wherein the contact sensor units are arranged for each of the edges of the segment to be detected in the circumferential direction of the tunnel.

5. 3. The detection device according to claim 1, wherein the notification unit is a light that is turned on when the control circuit unit detects a contact.

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