Pouring monitoring device and arch of tunnel

Abstract

To provide a pouring monitoring device capable of suppressing increases in manufacturing costs, and an arch of a tunnel equipped with the same.SOLUTION: A strip-shaped light source LT is attached to an inner surface 111c of a light-transmitting formwork of an arch of a tunnel 111 made of FRP. The strip-shaped light source LT transmits light through the formwork of the arch of the tunnel 111 in the thickness direction and emits light toward a gap SP between the formwork of the arch of the tunnel 111 and the tunnel natural ground 501. A pouring sensor SNS is attached to the inner surface of the formwork of the arch of the tunnel 111 at a location spaced apart from the strip-shaped light source LT. The pouring sensor SNS has a CdS cell, and a light-shielding body that blocks light from the periphery of the CdS cell. A light-shielding square pipe 112 is disposed on the inner surface of the formwork of the arch of the tunnel 111 between the strip-shaped light source LT and the pouring sensor SNS.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a pouring monitoring device and a center equipped with the same. [Background technology]

[0002] In tunnel construction, a centering tool may be used to pour the secondary concrete lining into the tunnel ground. The centering tool is designed to be movable on rails laid on the roadbed surface of the tunnel, and pouring concrete using the centering tool is carried out by alternately pouring concrete in a certain area in the longitudinal direction of the tunnel and moving the centering tool in the longitudinal direction of the tunnel.

[0003] When pouring the secondary concrete lining using a center pipe, concrete is poured into the space between the formwork and the tunnel ground. The concrete is poured from a pouring port located at the bottom, and the piping route for supplying the concrete is switched so that concrete is poured from an upper pouring port in turn depending on the height position of the top surface of the concrete.

[0004] Here, a device for monitoring the pouring height of concrete is disclosed in Patent Document 1. The monitoring device disclosed in Patent Document 1 includes an LED (Light Emitting Diode) as a light source, a CdS cell as a light sensor, and an external case that houses the LED and the CdS cell. The tip of the external case is fitted into a mounting hole opened in a metal formwork from the inside of the formwork, and the opening on the tunnel natural ground side is closed by a light-transmitting window member.

[0005] In addition, a partition member is disposed in the outer case to separate the LED and the CdS cell.

[0006] The monitoring device disclosed in Patent Document 1 can detect the height position of the upper surface of the concrete based on the magnitude of the resistance value in a CdS cell. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6478245 Summary of the Invention [Problem to be solved by the invention]

[0008] However, it is considered difficult to suppress the increase in manufacturing costs for the monitoring device disclosed in the above Patent Document 1. Specifically, in pouring concrete, it is necessary to switch the pouring port in the height direction in a relatively multi-stage manner. For this reason, it is necessary to arrange a relatively large number of CdS cells for detecting the position of the upper surface of the concrete. In this case, the monitoring device disclosed in the above Patent Document 1 adopts a configuration in which mounting holes are opened in a metal formwork and an external case that houses a CdS cell or the like is inserted into the mounting hole, so it is necessary to suppress the external case from being pushed inward by the pressure of the concrete or the window member from being damaged. Therefore, in the monitoring device disclosed in the above Patent Document 1, it is necessary to mount a large number of external cases having high rigidity to the metal formwork with high precision, and it is considered difficult to suppress the increase in manufacturing costs.

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide a pouring monitoring device that can suppress increases in manufacturing costs, and a center equipped with the same. [Means for solving the problem]

[0010] A concrete pouring monitoring device according to one aspect of the present invention includes a plurality of light sources and a plurality of concrete pouring sensors. The plurality of light sources are attached to the inner surface of a light-transmitting center formwork, and emit light through the center formwork in the thickness direction into a gap between the outer surface of the center formwork and the tunnel ground. The plurality of concrete pouring sensors are attached to the inner surface of the center formwork in a state corresponding to each of the plurality of light sources, and are capable of detecting the light emitted from the light sources.

[0011] In the concrete pouring monitoring device of this embodiment, each of the multiple concrete pouring sensors has a sensor body capable of detecting the light, and a light-blocking body that surrounds the periphery of the sensor body except for the portion facing the outer surface of the center formwork and has light-blocking properties.

[0012] In the concrete pouring monitoring device according to the above embodiment, a light source and a concrete pouring sensor are attached to the inner surface of a light-transmitting center formwork. That is, in the concrete pouring monitoring device according to the above embodiment, a mounting hole is provided in a metal center formwork and an external case is fitted into the mounting hole as in the monitoring device disclosed in the above Patent Document 1, but instead, a light source and a concrete pouring sensor are attached to the inner surface of the light-transmitting center formwork, so there is no need to open a mounting hole with high dimensional accuracy or to use an external case formed with high dimensional accuracy, making it possible to suppress increases in manufacturing costs.

[0013] In addition, the pouring monitoring device according to the above aspect can also detect poured concrete based on the amount of light detected by the sensor body of the pouring sensor. Therefore, it is possible to detect the rise height of poured concrete while suppressing an increase in manufacturing costs.

[0014] In addition, in the pouring monitoring device according to the above aspect, the periphery of the sensor body (except for the part facing the center formwork) is shaded by the light shielding body, so that light is prevented from entering the sensor body except for light passing through the center formwork in its thickness direction from the outside of the center formwork. Therefore, the rise of poured concrete can be accurately detected by the sensor body.

[0015] In the pouring monitoring device of the above-mentioned aspect, a light-shielding wall may be arranged between adjacent light sources and the pouring sensors to block light emitted from the light sources and traveling along the inner surface of the center formwork.

[0016] In the pouring monitoring device according to the above aspect, a light-shielding wall is disposed between adjacent light sources and the pouring sensor, so that even if a portion of the light emitted from the light source leaks in a direction along the inner surface of the center formwork, the leaked light is blocked by the light-shielding wall. Therefore, in the pouring monitoring device according to the above aspect, by providing a light-shielding body that blocks light from the periphery of the sensor body and by providing a light-shielding wall, pouring concrete can be detected with high reliability.

[0017] The pouring monitoring device according to the above aspect may further include a plurality of calibrators connected to the sensor body in each of the plurality of pouring sensors for calibrating the signal output from the sensor body.

[0018] In the concrete pouring monitoring device according to the above aspect, a calibrator is provided for each pouring sensor, so that the sensitivity can be adjusted by the calibrator to account for the sensitivity variation for each sensor, the sensitivity variation for each placement location, and the variation in the gap between the wellhead side and the face side. Therefore, the concrete pouring monitoring device according to the above aspect can detect poured concrete more accurately.

[0019] In the concrete pouring monitoring device according to the above aspect, the light-shielding body may be composed of a light-shielding case, a light-shielding lid, and a base plate. The light-shielding case may be a cylindrical case with one opening attached to the inner surface of the center formwork, and the light-shielding lid may be a lid having light-shielding properties and closing the other opening of the light-shielding case. The base plate may be a light-shielding base plate housed together with the sensor body in the light-shielding case and supporting the sensor body on the light-shielding lid side in a state where it blocks the light-shielding lid side.

[0020] In the pouring monitoring device according to the above aspect, the periphery of the sensor body is shielded by the light-shielding case, the light-shielding cover, and the base plate, so that it is possible to suppress the incidence of light other than the light from the gap into the sensor body. Therefore, the pouring monitoring device according to the above aspect can detect poured concrete more accurately.

[0021] A center according to one aspect of the present invention includes a center formwork and a concrete pouring monitoring device. The center formwork is made of fiber reinforced resin and has optical transparency. The concrete pouring monitoring device is the concrete pouring monitoring device according to any one of the above aspects.

[0022] The center of the above aspect is equipped with a pouring monitoring device of any of the above aspects, so that the above effects can be achieved as is. Effect of the Invention

[0023] In each of the above aspects, poured concrete can be monitored while suppressing increases in manufacturing costs. [Brief description of the drawings]

[0024] [Figure 1] A schematic diagram showing the configuration of a center equipped with a concrete pouring monitoring device of an embodiment. [Diagram 2] A side view showing the arrangement of the pouring sensor and the strip-shaped light source. [Diagram 3] A block diagram showing the configuration of a concrete pouring monitoring device. [Figure 4] FIG. 4 is a flow chart showing a control method executed by a calculation unit. [Diagram 5] A cross-sectional view showing the arrangement of a pouring sensor and a strip-shaped light source in a center formwork. [Figure 6] This is an expanded cross-sectional view showing the configuration of the pouring sensor. [Figure 7] FIG. 2A is a plan view showing the configuration of a light-shielding cover, and FIG. 2B is a plan view showing the configuration of a light-shielding case. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the embodiment described below except for the essential configuration.

[0026] In the diagrams used in the following explanation, "+X" indicates the face side, "-X" indicates the tunnel entrance side, "+Y" indicates the left side of the tunnel, "-Y" indicates the right side of the tunnel, "+Z" indicates the top of the tunnel, and "-Z" indicates the bottom of the tunnel.

[0027] 1. Overview of Sentoru 10 The schematic configuration of the center 10 will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram of the center 10 as viewed from the tunnel mouth side, and Figure 2 is a side view of the center formwork 11 of the center 10 as viewed from the right side.

[0028] As shown in Fig. 1, the center 10 comprises a plurality of center formworks 11 arranged in an arc shape in front view along the tunnel natural ground 501, and a frame 12 that supports the plurality of center formworks 11 on the tunnel roadbed surface 500. As shown in Fig. 1, it is also possible to lay rails on the roadbed surface 500 so that the center 10 can move on the rails in the longitudinal direction of the tunnel (the direction connecting the tunnel entrance and the tunnel face).

[0029] The center formwork 11 is expanded in diameter to fit the tunnel ground 501 when pouring concrete, and is reduced in diameter when the center 10 is moved, etc. As shown in Fig. 2, some of the center formworks 11 are provided with multiple inspection windows 11a, and some of the center formworks 11 are provided with a pouring port (not shown).

[0030] Each pouring port is connected to a pouring pipe, which is the concrete transport route.

[0031] 2. Configuration of pouring monitoring device 1 The configuration of the concrete pouring monitoring device 1 provided in the center 10 will be described with reference to Figs. 2 and 3.

[0032] As shown in FIG. 2 and FIG. 3, the concrete pouring monitoring device 1 includes a plurality of strip-shaped light sources LT1 to LT 13 and multiple pouring sensors SNS1 to SNS n and multiple calibrators CAL1 to CAL nand a controller 2. In FIG. 2, the strip-shaped light sources LT1 to LT 12 and pouring sensors SNS1 to SNS 13 The left side of the tunnel is also equipped with a similar structure. That is, a pouring sensor SNS is installed at the top end. 14 Excluding pouring sensors SNS1 to SNS 13 is also provided on the left side, and the value of "n" in Fig. 3 is 27. The larger the number of "n", the closer the device is to the top end.

[0033] In this embodiment, the pouring sensors SNS1 to SNS 14 In other words, the concrete pouring monitoring device 1 according to this embodiment has a total of 108 concrete pouring sensors SNS1 to SNS 14 Equipped with.

[0034] As shown in FIG. 2, strip light sources LT1 to LT 13 are provided for each center form 11. 13 Each of the strip-shaped light sources LT1 to LT 13 The X-direction length of each pouring sensor SNS1 to SNS 13 The length is set to the adjacent +Z or -Z side.

[0035] Here, the strip-shaped light sources LT1 to LT 13 The strip-shaped light sources LT1 to LT2 each have a rated luminous flux of 500 lm or more. 13 is used as the light source.

[0036] 3, the controller 2 includes an input receiving unit 21, a calculation unit 22, and a command output unit 23. The input receiving unit 21 is a part that receives input from an operator, and is configured, for example, by a touch panel.

[0037] The calculation unit 22 includes the pouring sensors SNS1 to SNS n The calculation unit 22 of the controller 2 is configured with a microprocessor including an MPU / CPU, ASIC, ROM, RAM, etc., and a memory. The calculation unit 22 executes firmware etc. stored in advance in the memory to calculate the height of the pouring sensors SNS1 to SNS n The rise height of the poured concrete is calculated based on the output signal from the

[0038] The command output unit 23 is a part that outputs commands to an operator based on the calculation results in the calculation unit 22. The command output unit 23 is formed of, for example, a display device such as a liquid crystal display.

[0039] Pouring sensors SNS1 to SNS n Each of the calibrators CAL1 to CAL n Calibrators CAL1 to CAL n are pouring sensors SNS1 to SNS n In addition, the concrete pouring sensors SNS1 to SNS n It is also possible to calibrate the sensitivity variation.

[0040] 3. Monitoring of pouring by the calculation unit 22 of the controller 2 A concrete pouring monitoring method executed by the calculation unit 22 of the controller 2 will be described with reference to FIG.

[0041] As shown in Fig. 4, in pouring using the center 10, the calculation unit 22 sets "k ⇒ 1" and sets the pouring sensor to be monitored to the pouring sensor SNS1 arranged at the bottom (step ST1). Then, the calculation unit 22 causes the command output unit 23 to output a pump drive command (step ST2).

[0042] When the worker drives the pump after confirming the pump drive command output to the command output unit 23, pouring of concrete starts from the pouring hole. After pouring of concrete starts, the calculation unit 22 judges whether or not the eight pouring sensors SNS1 on the left and right have detected concrete based on the output signal from the pouring sensor SNS1 (step ST3).

[0043] When the calculation unit 22 determines that the pouring sensor SNS1 has detected concrete (step ST3: YES), it causes the command output unit 23 to output a pump stop command (step ST4). The worker who has confirmed the pump stop command outputted to the command output unit 23 stops the pump and drives the vibrator. This causes the poured concrete to be compacted.

[0044] When the work of compacting the concrete using the vibrator is completed, the worker inputs to the input receiving unit 21 that the work using the vibrator has been completed. When the calculation unit 22 determines that there has been an input to the input receiving unit 21 (step ST5: YES), it sets "k" to "k+1" (step ST6). That is, with respect to the pouring sensor SNS that detected the concrete, it sets the pouring sensor SNS one level above it as the monitoring target. Then, it is determined whether "k" exceeds "n" (step ST7).

[0045] When the calculation unit 22 determines that "k≦n" holds (step ST7: NO), it causes the command output unit 23 to output a piping switching command (step ST8). After confirming the piping switching command outputted to the command output unit 23, the worker switches the piping so that concrete is poured from the pouring port one level above.

[0046] When the piping switching work is completed, the worker inputs the fact that the piping switching work is completed to the input receiving unit 21. When the calculation unit 22 determines that there is an input to the input receiving unit 21 (step ST9: YES), the calculation unit 22 returns to step ST2 and executes control.

[0047] The calculation unit 22 continues to execute steps ST2 to ST9 until it determines in step ST7 that "k>n." When pouring of concrete is completed up to the top end, the pouring work in that area is terminated, and after curing, the center 10 is moved in the longitudinal direction of the tunnel to repeat pouring of concrete.

[0048] 4. Arrangement of the strip light source LT and the pouring sensor SNS relative to the center formwork 11 The arrangement of the strip-shaped light source LT and the pouring sensor SNS relative to the central formwork 11 will be described with reference to Fig. 5. Note that Fig. 5 shows the arrangement of the strip-shaped light source LT and the pouring sensor SNS relative to one of the multiple central formworks 11. The strip-shaped light source LT and the pouring sensor SNS are also arranged in the other central formworks 11 in the same manner as in Fig. 5.

[0049] The center formwork 11 of this embodiment includes a formwork body 111 and a plurality of square pipes 112. The formwork body 111 is made of FRP (Fiber Reinfoced Plastics). More specifically, it is made of, for example, GFRP (Glass Fiber Reinfoced Plastics). The formwork body 11 has optical transparency.

[0050] The formwork body 111 is integrally formed with an opposing wall 111a that runs along the tunnel natural ground 501 and a plurality of ribs 111b that protrude inward from an inner surface 111c of the opposing wall 111a. The opposing wall 111a is formed such that an outer surface 111d faces the tunnel natural ground 501. In this embodiment, the thickness of the opposing wall 111a and the thickness of the ribs 111b are the same at T1. The thickness T1 is, for example, 6 mm. The height H1 of the ribs 111b is, for example, 50 mm.

[0051] Each of the multiple square pipes 112 is made of a steel pipe and is arranged to extend in the longitudinal direction (X direction in FIG. 2) of the center 10. The square pipes 112 support the formwork body 111 from the inside and play a role in maintaining its shape. Specifically, the square pipes 112 can be made of galvanized steel pipes.

[0052] The square pipes 112 are fixed to the inner surface 111c of the formwork body 111 between adjacent ribs 111b. The height H2 of the square pipes 112 is the same as the height H1 of the ribs 111b.

[0053] The strip-shaped light source LT is attached to the inner surface 111c of the formwork main body 111 between adjacent square pipes 112, and is arranged so that light (visible light) can be emitted through the formwork main body 111 in the thickness direction into the gap SP between the formwork main body 111 and the tunnel ground 501.

[0054] The pouring sensor SNS is attached to a location spaced a distance L (for example, 100 mm to 200 mm) from the strip-shaped light source LT on the inner surface 111c of the formwork body 111. A rib 111b and a square pipe 112 are interposed between the pouring sensor SNS and the strip-shaped light source LT.

[0055] The light A1 emitted from the strip-shaped light source LT diffuses into the gap SP between the center formwork 11 and the tunnel ground 501, and a portion of it is reflected by the tunnel ground 501 (arrow A2), and then enters the pouring sensor SNS arranged at a position spaced apart from the strip-shaped light source LT (arrow A3).

[0056] The detailed structure of the concrete pouring sensor SNS will be described later, but it is a sensor that has a CdS cell. The more the amount of incident light, the smaller the electrical resistance of the CdS cell becomes, and conversely, the less the amount of incident light, the larger the electrical resistance becomes.

[0057] As shown in Fig. 5, when concrete 502 is poured into the gap SP between the center formwork 11 and the tunnel ground 501, the upper surface 502a of the concrete 502 gradually rises (the concrete concrete 502 rises). When the height position of the upper surface 502a of the poured concrete 502 is higher than the height position of the pouring sensor SNS, the light to the pouring sensor SNS is blocked. Therefore, the resistance value of the pouring sensor SNS becomes higher than when light is incident. The calculation unit 22 judges the rising height of the concrete based on the change in the resistance value of the pouring sensor SNS.

[0058] In this embodiment, a square pipe 112 is interposed between the strip light source LT and the pouring sensor SNS. The square pipe 112 has a light-shielding property. Therefore, even if a part of the emitted light from the strip light source LT leaks to the inside of the opposing wall portion 111a, the square pipe 112 blocks the leaked light. Therefore, even if there is leaked light, it is possible to prevent the light from entering the pouring sensor SNS.

[0059] 5. Detailed structure of the concrete pouring sensor SNS The detailed structure of the concrete pouring sensor SNS will be described with reference to Figs. 6 and 7.

[0060] 6, the concrete pouring sensor SNS includes a sensor module 31, a light-shielding case 32, and a light-shielding cover 33. The sensor module 31 includes a CdS cell 311, a substrate 312, and a signal line 313. As described above, the CdS cell 311 has a smaller electrical resistance value as the amount of incident light increases, and conversely, the smaller the amount of incident light, the larger the electrical resistance value.

[0061] The substrate 312 has a CdS cell 311 bonded to one main surface thereof, and a signal line 313 bonded to the other main surface 312b thereof. The substrate 312 has two through holes 312a formed therein.

[0062] As shown in FIG. 6 and FIG. 7(b), the light-shielding case 32 is a cylindrical member having light-shielding properties, and has a storage section 32a that stores the sensor module 31. The storage section 32a has a portion in which the sensor module 31 is stored expanded in diameter compared to other portions. In addition, two protrusions 32b protruding outward in the axial direction are provided in a portion having a step in the portion facing the storage section 32a. The protrusions 32b can be fitted into a through hole 312a provided in a substrate 312 of the sensor module 31. The substrate 312 is restricted from moving in the circumferential direction and the radial direction by fitting the through hole 312a into the protrusions 32b of the light-shielding case 32. The protrusions 32b are provided at a height lower than the height of the surrounding edge wall 32e.

[0063] The light-shielding case 32 has through holes 32c through which screws for attaching the light-shielding lid 33 can be passed. The light-shielding case 32 is attached to the center formwork 11 at a bottom 32d on the side having an opening opposite to the side covered by the light-shielding lid 33.

[0064] 6 and 7(a), the light-shielding cover 33 is a member having light-shielding properties. The light-shielding cover 33 has a through hole 32b opened at a position corresponding to the through hole 32c of the light-shielding case 32, and a through hole 33c opened in the center portion in the radial direction. The through hole 33b is a hole through which a screw is passed when attaching the light-shielding cover 33 to the light-shielding case 32. The through hole 33c is a hole through which a signal line 313 of the sensor module 31 passes.

[0065] Furthermore, the light-shielding lid 33 has four protrusions 33d protruding toward the housing portion 32a of the light-shielding case 32. When the light-shielding lid 33 is attached to the light-shielding case 32 housing the sensor module 31, the four protrusions 33d press the other main surface 312b of the substrate 312 (the main surface opposite to the surface to which the CdS cell 311 is bonded). This allows the sensor module 31 to be placed in the housing portion 32a without any rattle.

[0066] Although a through hole 33c is provided in the light-shielding cover 33, since the substrate 312 of the sensor module 31 has light-shielding properties, even if light enters inward through the through hole 33c, it is prevented from entering the CdS cell 311.

[0067] In this embodiment, the light-shielding case 32 and the light-shielding cover 33 are made of a resin material, but metal materials or the like may also be used as the material for forming them.

[0068] 6.Effects In the concrete pouring monitoring device 1 according to this embodiment, the strip-shaped light source LT and the concrete pouring sensor SNS are attached to the inner surface 111c of the light-transmitting formwork main body 111. That is, in the concrete pouring monitoring device 1, unlike the monitoring device disclosed in the above Patent Document 1, in which a mounting hole is provided in a metal center formwork and an external case is fitted into the mounting hole, the strip-shaped light source LT and the concrete pouring sensor SNS are attached to the inner surface 111c of the light-transmitting formwork main body 111, so there is no need to open a mounting hole with high dimensional accuracy or to employ an external case formed with high dimensional accuracy, making it possible to suppress an increase in manufacturing costs.

[0069] In addition, the pouring monitoring device 1 can also detect the poured concrete 502 based on the amount of light detected by the CdS cell (sensor body) 311 of the pouring sensor SNS. Therefore, it is possible to detect the rising height of the poured concrete 502 while suppressing an increase in manufacturing costs.

[0070] Furthermore, in the pouring monitoring device 1, the periphery of the CdS cell 311 (except for the portion facing the formwork main body 111) is shielded from light by the light shielding bodies (light shielding case 32, light shielding cover 33, and substrate 312), so that light is prevented from entering the CdS cell 311, except for light passing through the opposing wall portion 111a in the thickness direction from the outer surface 111d side of the formwork main body 111. Therefore, the rise of the poured concrete 502 can be accurately detected by the CdS cell 311.

[0071] Furthermore, in the concrete pouring monitoring device 1 according to this embodiment, a square pipe 112 having light-shielding properties is disposed between adjacent strip-shaped light sources LT and the concrete pouring sensor SNS, so that even if a portion of the light emitted from the strip-shaped light source LT leaks in a direction along the inner surface 111c of the formwork body 111, the leaked light is blocked by each pipe 112. Therefore, in the concrete pouring monitoring device 1, by providing a light-shielding body (light-shielding case 32, light-shielding cover 33, substrate 312) that blocks light from around the CdS cell 311 and by providing the square pipe 112, the pouring concrete 502 can be detected with high reliability.

[0072] In addition, in the concrete pouring monitoring device 1 according to this embodiment, the concrete pouring sensors SNS1 to SNS n Calibrators CAL1 to CAL n Since it is equipped with the pouring sensors SNS1 to SNS n The sensitivity variations for each position, the sensitivity variations for each location, and the variations in the gap SP between the wellhead side (-X side) and the face side (+X side) are all measured using the calibrators CAL1 to CAL n Therefore, the pouring monitoring device 1 can detect the rise of the poured concrete 502 more accurately.

[0073] Furthermore, in the concrete pouring monitoring device 1 according to this embodiment, the periphery of the CdS cell 311 (excluding the portion facing the formwork body 111) is shielded by the light-shielding case 32, the light-shielding cover 33, and the substrate 312, so that it is possible to prevent light other than that coming from the gap SP between the CdS cell 311 and the tunnel natural ground 501 from entering the CdS cell 311. Therefore, the concrete pouring monitoring device 1 can detect the rise of the poured concrete 502 even more accurately.

[0074] In addition, since the center 10 according to this embodiment is equipped with the concrete pouring monitoring device 1 capable of achieving the above-mentioned effects, the above-mentioned effects can be achieved as they are.

[0075] As described above, the pouring monitoring device 1 according to this embodiment and the center 10 equipped with the same can monitor the rise of poured concrete 502 while suppressing increases in manufacturing costs.

[0076] [Variations] In the above embodiment, the square pipe 112 is provided as the light-shielding wall, but in the present invention, a light-shielding wall other than a square pipe may be provided. For example, a light-shielding wall in the shape of a fin erected from the inner surface of the formwork body may be used. Also, in the present invention, it is not necessarily required to provide a light-shielding wall.

[0077] In the above embodiment, the light source is a strip-shaped light source LT, but the present invention may be configured to include a light source other than a strip-shaped light source. For example, an LED, which is a point light source, may be used as the light source.

[0078] In addition, in the present invention, not only a light source that emits visible light, but also a light source that emits ultraviolet light or infrared light can be used. In this case, by employing a sensor body that can detect the emitted light, the same effect as above can be obtained.

[0079] In the above embodiment, the CdS cell 311 is provided as the sensor body, but in the present invention, a sensor body other than a CdS cell may be provided. For example, a photodiode or the like may be adopted.

[0080] In the above embodiment, the form body 111 is made of GFRP, but in the present invention, the material for forming the form body is not limited to this as long as it has optical transparency. For example, PPS (polyphenylene sulfide) resin, PSU (polysulfone) resin, etc. can also be used.

[0081] In the above embodiment, the controller 2 includes the command output unit 23 and outputs various commands to the worker, but in the present invention, it is not necessary for the controller to output various commands. For example, an indicator may be provided for each pouring sensor, and the indicator may be configured to indicate the pouring sensor that has detected poured concrete. In this case, the worker can check the indicator at the appropriate time and start / stop the pump, switch the piping, etc. [Explanation of symbols]

[0082] 1. Pouring monitoring device 2. Controller 10. Centre 11 Center Formwork 32 Light-shielding case (light-shielding body) 33 Light-shielding lid (light-shielding body) 111 Formwork body 111b Rib 111c Inside 112 Square pipe (shading wall) 311 CdS sensor (sensor body) 312 Substrate (shading body) 501 Tunnel ground 502 Cast concrete CAL1~CAL n calibrator SNS1~SNS n Concrete pouring sensor LT1~LT 13 Strip light source (light source) SP gap

Claims

1. A plurality of light sources attached to the inner surface of a light-transmitting center form and emitting light through the center form in a thickness direction to a gap between an outer surface of the center form and the tunnel natural ground; A plurality of pouring sensors that are attached to the inner surface of the center formwork in a state corresponding to each of the plurality of light sources and can detect light emitted from the light sources; Equipped with Each of the plurality of pouring sensors is A sensor body capable of detecting the light; a light-shielding body that surrounds a portion of the periphery of the sensor body except for a portion facing the outer surface side of the center formwork and has light-shielding properties; having Pouring monitoring device.

2. Between the adjacent light sources and the pouring sensors, a light-shielding wall is provided to block the light emitted from the light sources and traveling along the inner surface of the center formwork. The pouring monitoring device according to claim 1.

3. Further comprising a plurality of calibrators connected to the sensor body of each of the plurality of pouring sensors for calibrating a signal output from the sensor body; The pouring monitoring device according to claim 1.

4. The light blocking body is a light-shielding case having a cylindrical shape and one opening side attached to the inner surface of the center formwork; a light-shielding cover that covers the other opening of the light-shielding case; a light-shielding substrate that is accommodated in the light-shielding case together with the sensor body and that supports the sensor body on the light-shielding cover side in a state where the light-shielding cover side is blocked; Consists of: The pouring monitoring device according to claim 1.

5. A center formwork formed of fiber reinforced resin and having optical transparency; A pouring monitoring device according to any one of claims 1 to 4, Equipped with Centre.

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