Caisson bulkhead monitoring system and method for managing the input of filling material into caisson bulkheads.

Abstract

To more accurately grasp an amount of filling material to be introduced during caisson installation work than when using a water pressure gauge, distance meter, etc.SOLUTION: Water W and a filling material R introduced into a space S press the optical fiber sensor 1 installed in the space S. As a result, the optical fiber sensor 1 receives pressure at a portion in contact with the water W and a portion in contact with the filling material R. Then, a monitoring device 2 specifies the magnitude of the pressure that the optical fiber sensor 1 receives and the position where the pressure is received. Thereby, the monitoring device 2 monitors the force that the space S receives from the water W or the filling material R.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a monitoring system inside a caisson partition wall and a method for managing the filling of filling materials into the caisson partition wall.

Background Art

[0002] Patent Document 1 describes a method for managing the filling amount of filling materials in a caisson, which includes a management step of managing the filling amount of the filling materials in each compartment based on the difference between the initial water level of each compartment and the water level after the filling materials are filled into the compartment in a caisson having a plurality of compartments.

[0003] Patent Document 2 describes a safety control device during towing that monitors abnormal and normal states based on measurement values by water level sensors installed in each compartment with a drainage pump and a water level sensor for discharging water that has entered them, and controls the drainage pump at the location where an abnormality occurs to maintain the levelness of a hollow concrete caisson with an opening when an abnormal state occurs.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] For example, Patent Document 1 proposes two types of water level sensors. One of them is a water level sensor that is arranged at the bottom of the compartment, measures the water level based on the detected water pressure, and outputs water level data representing the measured water level. The other one is a water level sensor that measures the water level by installing a measuring device that measures the distance to an object using laser light above the compartment.

[0006] Since the former water level sensor is based on water pressure, the amount of filling material added must be measured by the amount of water pushed out by that filling material. In other words, the former water level sensor cannot directly measure the amount of filling material added. Furthermore, the latter water level sensor detects the presence or absence of an object that obstructs the path of the laser beam and reflects it, and therefore cannot measure other objects that are in the shadow of that object. Furthermore, at least one connecting hole is required between the compartments, and when measuring with a water level sensor, the water flow between the compartments through the connecting hole must be equalized so that the water level in each compartment is averaged before the filling material is added.

[0007] One of the objectives of this invention is to accurately determine the amount of filling material to be used in caisson installation work, compared to using a water pressure gauge, distance meter, etc. [Means for solving the problem]

[0008] The caisson partition wall monitoring system according to claim 1 of the present invention is a caisson partition wall monitoring system comprising: optical fiber sensors installed in each of the partitioned spaces inside the caisson, which are spaces into which water or filling material is introduced; and a monitoring device that measures the intensity of reflected light by irradiating light onto the optical fiber sensors and monitors the force that the space receives from the water or filling material.

[0009] The caisson partition wall monitoring system according to claim 2 of the present invention is a caisson partition wall monitoring system in which, in the embodiment described in claim 1, the optical fiber sensor is installed so as to extend in the depth direction along the partition wall that divides the inside of the caisson.

[0010] The caisson partition wall monitoring system according to claim 3 of the present invention is a caisson partition wall monitoring system in which, in the embodiment described in claim 1, the optical fiber sensor is installed so as to extend in the depth direction along the corner of the space.

[0011] The caisson partition wall monitoring system according to claim 4 of the present invention is a caisson partition wall monitoring system in which, in any one of claims 1 to 3, the optical fiber sensor reaches the bottom surface inside the caisson and is installed in a spiral shape on the bottom surface.

[0012] The caisson partition wall monitoring system according to claim 5 of the present invention is a caisson partition wall monitoring system in which the optical fiber sensor reaches the bottom surface inside the caisson and is installed along the bottom surface to an opposing position.

[0013] The caisson partition wall monitoring system according to claim 6 of the present invention is a caisson partition wall monitoring system in which the optical fiber sensor has a curved portion on the bottom surface, as described in the embodiment of claim 5.

[0014] The caisson partition wall monitoring system according to claim 7 of the present invention is a caisson partition wall monitoring system in which, in the embodiment described in claim 2, there are multiple optical fiber sensors installed in the space, at least one of which is installed in each of a pair of adjacent partition walls in the space, and the optical fiber sensors installed in each of the pair of partition walls reach the bottom surface of the caisson, cross each other on the bottom surface, and are installed up to the opposing partition wall.

[0015] The input management method according to claim 8 of the present invention is a method for managing the input of filling material into a caisson partition using the caisson partition monitoring system described in any one of claims 1 to 7. [Effects of the Invention]

[0016] According to the present invention, in caisson installation work, the amount of filling material to be added can be accurately determined compared to when using a pressure gauge, distance meter, etc. Furthermore, the amount of filling material to be added and the destination of the filling material can be determined according to the amount of filling material to be added to each space, and the filling material can be safely added to the caisson. [Brief explanation of the drawing]

[0017] [Figure 1] A diagram showing an example of the overall configuration of the caisson partition wall internal monitoring system 9 according to the present invention. [Figure 2] A diagram showing an example of the installation of the optical fiber sensor 1. [Figure 3] A diagram showing an example of the configuration of the optical fiber sensor 1. [Figure 4] A diagram showing an example of the configuration of the monitoring device 2. [Figure 5] A diagram showing an example of the configuration of the information processing device 5. [Figure 6] A diagram showing an example of the arrangement of the optical fiber sensor 1 on the bottom surface B. [Figure 7] A diagram showing a state where water W and filling material R are poured into the space S of the caisson 3. [Figure 8] A diagram showing another example of the arrangement of the optical fiber sensor 1. [Figure 9] A diagram showing another example of the arrangement of the optical fiber sensor 1 on the bottom surface B. [Figure 10] A diagram showing an example of a spiral optical fiber sensor 1. [Figure 11] A diagram showing an example of another spiral optical fiber sensor 1. [Figure 12] A diagram showing an example of the curved shape of the optical fiber sensor 1 on the bottom surface B. [Figure 13] A diagram showing an example of the curved shape of the optical fiber sensor 1 on the bottom surface B. [Figure 14] A diagram showing an example of the curved shape of the optical fiber sensor 1 on the bottom surface B.

Mode for Carrying Out the Invention

[0018] <Embodiment> In the diagram below, the space in which each component is arranged is represented as an xyz right-handed coordinate system. Among the coordinate symbols shown in the diagram, a symbol with a point inside a circle represents an arrow pointing from the back of the page to the front. A symbol with two intersecting lines inside a circle represents an arrow pointing from the front of the page to the back. In space, the direction along the x-axis is called the x-axis direction. Within the x-axis direction, the direction in which the x component increases is called the +x direction, and the direction in which the x component decreases is called the -x direction. The y and z components are also defined as the y-axis direction, +y direction, -y direction, z-axis direction, +z direction, and -z direction, respectively, according to the above definitions.

[0019] <Overall Structure> Figure 1 shows an example of the overall configuration of the caisson partition wall monitoring system 9 according to the present invention. In Figure 1, the -z direction is the direction of gravity and is downward. The caisson partition wall monitoring system 9 is a system that monitors the water and filling material introduced into each partitioned space inside the caisson 3. The caisson partition wall monitoring system 9 shown in Figure 1 includes an optical fiber sensor 1, a monitoring device 2, a communication line 4, and an information processing device 5.

[0020] As shown in Figure 1, the caisson 3 is divided into multiple spaces S by one or more partition walls P. In the following description, the walls separating the inside and outside of the caisson 3 will also be referred to as partition walls P. In the example shown in Figure 1, in addition to the four partition walls P separating the inside and outside as described above, the caisson 3 has one partition wall P extending along the y-axis and two partition walls P extending along the x-axis on its interior side. With this configuration, the caisson 3 is divided into six spaces S.

[0021] As shown in Figure 1, a fiber optic sensor 1 is installed in space S along the partition wall P (the wall separating the inside and outside in the example shown in Figure 1). This fiber optic sensor 1 is a sensor that uses optical fibers to detect pressure applied at any location.

[0022] The optical fiber sensor 1 is connected to the monitoring device 2. The monitoring device 2 emits light into the optical fiber sensor 1 and measures the intensity of the reflected light. Based on the measured intensity of the reflected light, the monitoring device 2 monitors the magnitude and location of the force acting on the optical fiber sensor 1 within the partition wall.

[0023] The caisson bulkhead monitoring system 9 detects the planar height of the filling material R (not shown in Figure 1) using an optical fiber sensor 1 installed in the bulkhead P, calculates the weight of the filling material R from the stress exerted on the optical fiber sensor 1 installed on the bottom surface B (not shown in Figure 1), and calculates the shape of the filling material to be placed using the unit load of the target filling material R and the calculated weight. Subsequently, by comparing the planar height measured by the optical fiber sensor 1 in the bulkhead P with the shape of the filling material to be placed using the optical fiber sensor installed on the bottom surface B, a more accurate height and shape of the filling material to be placed can be calculated.

[0024] Although Figure 1 shows only one set of optical fiber sensor 1 and monitoring device 2, the caisson partition wall monitoring system 9 may have multiple optical fiber sensors 1 and multiple monitoring devices 2 for each caisson 3. The caisson partition wall monitoring system 9 may have multiple sets of optical fiber sensor 1 and monitoring device 2. The caisson partition wall monitoring system 9 may have at least one optical fiber sensor 1 for each space S partitioned by the partition wall P inside the caisson 3.

[0025] Furthermore, the monitoring device 2 is connected to the information processing device 5 via a communication line 4. This information processing device 5 is a personal computer or portable terminal installed in the management office. The monitoring device 2 transmits to the information processing device 5 the number of the space S in which each optical fiber sensor 1 is installed (i.e., identification information), and the force and position received by the optical fiber sensor 1, either in real time or at predetermined intervals (for example, every 2 seconds).

[0026] Figure 2 shows an example of the installation of the optical fiber sensor 1. In the example shown in Figure 2, the optical fiber sensors 1,1 are installed inside the caisson 3 so as to extend in the depth direction along the partition walls P,P. Here, the depth direction is the direction of gravity, that is, the -z direction. In other words, this optical fiber sensor 1 is an example of an optical fiber sensor installed so as to extend in the depth direction along the partition walls that divide the inside of the caisson.

[0027] The optical fiber sensor 1 shown in Figure 2 extends in the depth direction (-Z direction) from the upper end of the partition wall P on the -x side. When this optical fiber sensor 1 reaches the bottom surface B inside the caisson, it extends along this bottom surface B to the opposite position. The opposite position refers to the position opposite to the bottom surface B. Therefore, this optical fiber sensor 1 is an example of an optical fiber sensor that reaches the bottom surface inside the caisson and is installed along this bottom surface to the opposite position.

[0028] The optical fiber sensor 1 shown in Figure 2 consists of two optical fiber sensors. These two optical fiber sensors 1,1 are installed one at a time on each of a pair of adjacent partition walls P in space S. Furthermore, these two optical fiber sensors 1,1 each reach the bottom surface B and are installed so as to cross each other on this bottom surface B. Therefore, the optical fiber sensors 1,1 shown in Figure 2 are multiple optical fiber sensors, and this is an example of an optical fiber sensor in which at least one is installed on each of a pair of adjacent partition walls in space. Furthermore, this is an example of an optical fiber sensor in which these two optical fiber sensors 1,1 each reach the bottom surface B of the caisson, cross each other on this bottom surface B, and are installed up to the opposing partition wall.

[0029] <Configuration of the optical fiber sensor> Figure 3 shows an example of the configuration of the optical fiber sensor 1. The optical fiber sensor 1 shown in Figure 3 has a core 11, a cladding 12, and a covering 10.

[0030] The core 11 and the cladding 12 are both made of transparent material. The core 11 and the cladding 12 are, for example, glass. The core 11 is made of a transparent material with a higher refractive index than the cladding 12. The cladding 12 has a lower refractive index than the core 11 and surrounds the core 11. The covering 10 is made of a light-blocking material and surrounds the cladding 12.

[0031] The core 11 has a detection unit 111. This detection unit 111 is composed of a plurality of diffraction gratings 1111 arranged at predetermined intervals. The diffraction gratings 1111 are formed, for example, by laser processing. This detection unit 111 is a so-called FBG (Fiber Bragg Grating).

[0032] Laser light incident on the core 11 propagates while reflecting at the interface with the cladding 12. When the detection unit 111 passes this laser light propagating through the core 11, it selectively reflects wavelengths corresponding to the spacing of the diffraction gratings 1111. If the detection unit 111 is heated or deformed by an external force, for example, the spacing of the diffraction gratings 1111 changes. When the spacing of the diffraction gratings 1111 changes, the wavelength of the laser light reflected by the detection unit 111 changes according to the changed spacing.

[0033] <Configuration of the monitoring device> Figure 4 shows an example of the configuration of the monitoring device 2. The monitoring device 2 is a device that emits light into the optical fiber sensor 1, measures the intensity of the reflected light, and transmits the measured data. The monitoring device 2 shown in Figure 4 is a device known as an interrogator. As shown in Figure 4, this monitoring device 2 has a control unit 21, a light source 22, an optical circulator 23, and a light receiving unit 24.

[0034] The control unit 21 is a control device that controls each component of the monitoring device 2. The control unit 21 includes a processor, memory, etc. The processor in the control unit 21 is, for example, a CPU (Central Processing Unit). This processor may be an FPGA (Field Programmable Gate Array) or may include an FPGA. Furthermore, this processor may include an ASIC (Application Specific Integrated Circuit) or other programmable logic device.

[0035] The control unit 21 stores the data obtained by the light receiving unit 24 in memory. The control unit 21 also has a terminal that connects to the memory via a bus. For example, a communication cable is connected to this terminal. This communication cable connects the monitoring device 2 and the communication line 4 in a communicative manner via a gateway device (not shown). The information processing device 5 is connected to the terminal of the monitoring device 2 via the communication line 4. As a result, the information processing device 5 obtains the above-mentioned data from the monitoring device 2.

[0036] The light source 22 is a device that emits light into the optical fiber sensor 1 under the control of the control unit 21. This light source 22 is, for example, a light-emitting diode (LED) or a laser diode.

[0037] The optical circulator 23 is a device that restricts the direction of light propagation. This optical circulator 23 directs laser light incident from the light source 22 to the optical fiber sensor 1, but prevents it from reaching the light receiving unit 24. On the other hand, this optical circulator 23 directs reflected light returning from the optical fiber sensor 1 to the light receiving unit 24, but prevents it from reaching the light source 22.

[0038] The light-receiving unit 24 is a device that receives laser light reflected from the optical fiber sensor 1. The light-receiving unit 24 outputs a signal to the control unit 21 corresponding to the wavelength and intensity of the received laser light. The light-receiving unit 24 includes, for example, a photodiode and an A / D converter.

[0039] <Configuration of the information processing device> Figure 5 shows an example of the configuration of the information processing device 5. The information processing device 5 shown in Figure 5 includes a processor 51, memory 52, interface 53, operation unit 54, and display unit 55. These components are connected to each other in a way that allows them to communicate with one another, for example, by a bus.

[0040] The processor 51 controls each part of the information processing device 5 by reading and executing computer programs (hereinafter simply referred to as "programs") stored in the memory 52. ​​The processor 51 is, for example, a CPU.

[0041] Interface 53 is a communication circuit that connects the information processing device 5 to other devices via wired or wireless means, enabling communication. This interface 53 is used for communication to acquire data from the monitoring device 2 via the communication line 4, using at least one of wired or wireless means.

[0042] The control unit 54 is equipped with various control elements such as control buttons, a keyboard, a touch panel, and a mouse for issuing various instructions. It receives operations and sends signals corresponding to the operations to the processor 51. These operations include, for example, pressing keys on the keyboard or making gestures on the touch panel.

[0043] The display unit 55 has a display screen such as a liquid crystal display and displays images under the control of the processor 51. A transparent touch panel of the operation unit 54 may be placed on top of the display screen. The information processing device 5 does not necessarily have to have an operation unit 54 and a display unit 55. The information processing device 5 may be operated from an external device via an interface 53, or may present information to an external device.

[0044] Memory 52 is a storage means that stores the operating system, various programs, data, etc., which are loaded into the processor 51. Memory 52 includes RAM and ROM.

[0045] The memory 52 may also include a computer-readable recording medium. The memory 52 may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), compact disc, digital multipurpose disc, or Blu-ray® disc; a hard disk drive; a solid-state drive; a flexible disk; a smart card; flash memory (e.g., a card, stick, or key drive); a floppy® disc; or a magnetic strip.

[0046] <Placement of the optical fiber sensor on the bottom surface> Figure 6 shows an example of the arrangement of optical fiber sensors 1 on the base surface B. Both optical fiber sensors 1,1 shown in Figure 2 reach the center of the edge of the base surface B. These two optical fiber sensors 1,1 are installed extending from the center of the edge at the lower end of the partition wall P to the center of the opposite edge.

[0047] These two optical fiber sensors 1,1 intersect in the center of the base surface B. Of these two optical fiber sensors 1, one extends along the x-axis and the other extends along the y-axis. Therefore, both the x-axis gradient and the y-axis gradient of the pressure acting on the base surface B are detected by these two optical fiber sensors 1,1.

[0048] Figure 7 shows the state after water W and filling material R are poured into the space S of caisson 3. The water W and filling material R poured into space S press against the optical fiber sensor 1 installed in space S. As a result, the optical fiber sensor 1 receives pressure on the parts that are in contact with the water W and the parts that are in contact with the filling material R.

[0049] The monitoring device 2 then identifies the magnitude of the pressure received by the optical fiber sensor 1 and the location where that pressure was received. This allows the monitoring device 2 to monitor the force exerted on the space S by the water W or the filling material R.

[0050] In other words, the optical fiber sensor 1 is an example of an optical fiber sensor installed in each of the partitioned spaces inside the caisson, in the space into which water or filling material is introduced.

[0051] Furthermore, this monitoring device 2 is an example of a monitoring device that monitors the force exerted on a space by water or filling material by irradiating light into an optical fiber sensor and measuring the intensity of the reflected light.

[0052] As described above, the caisson partition wall monitoring system 9 uses an optical fiber sensor 1 and a monitoring device 2 to detect water W and filling material R, rather than using a pressure gauge, distance meter, etc. Therefore, compared to the case where a pressure gauge, distance meter, etc. is used, the caisson partition wall monitoring system 9 does not require a communication hole and can accurately grasp the amount of filling material put into each space S.

[0053] <Variation> The above describes the embodiment, but the contents of this embodiment can be modified as follows. Furthermore, the following modifications may be combined.

[0054] <1> In the embodiment described above, the optical fiber sensor 1 reached the bottom surface B and extended from the center of that side to the center of the opposite side, but the arrangement is not limited to this.

[0055] Figure 8 shows another example of the arrangement of the optical fiber sensor 1. Both optical fiber sensors 1,1 shown in Figure 8 extend in the depth direction along the corner of space S. When both optical fiber sensors 1 reach the bottom surface B, they extend diagonally and are installed. In other words, this optical fiber sensor 1 is an example of an optical fiber sensor installed to extend in the depth direction along the corner of space.

[0056] Figure 9 shows an example of another arrangement of the optical fiber sensor 1 on the bottom surface B. When the optical fiber sensors 1,1 are installed as shown in Figure 8, the two optical fiber sensors 1,1 intersect on the bottom surface B as shown in Figure 9. These two optical fiber sensors 1,1 extend in different directions. Therefore, the optical fiber sensor 1 can observe the pressure gradient acting on the bottom surface B along the direction in which each extends.

[0057] <2> In the embodiment described above, two optical fiber sensors 1 were installed in each space S, but the number is not limited to this. One optical fiber sensor 1 may be provided in each space S, or three or more may be provided. It is desirable to change the shape of the sensor installed on the bottom surface B depending on the number of sensors provided.

[0058] <3> In the embodiments described above, the optical fiber sensor 1 extended in a straight line on the bottom surface B, but it may have a curved portion. For example, the optical fiber sensor 1 may be installed in a spiral shape on the bottom surface B. This spirally installed optical fiber sensor 1 is an example of an optical fiber sensor that reaches the bottom surface B inside the caisson and is installed in a spiral shape on this bottom surface B.

[0059] Figure 10 shows an example of a spiral-shaped optical fiber sensor 1. The optical fiber sensor 1 shown in Figure 10 has a so-called Archimedes spiral shape. The end of the optical fiber sensor 1 shown in Figure 10 is located in the center of the base surface B. Even with this shape, the optical fiber sensor 1 is installed with a two-dimensional spread on the base surface B. Therefore, this optical fiber sensor 1 can detect the pressure gradient acting on the base surface B by associating the detection result with the corresponding position on the base surface B.

[0060] Figure 11 shows another example of a spiral-shaped optical fiber sensor 1. The optical fiber sensor 1 shown in Figure 11 has a so-called Fermat spiral shape. The optical fiber sensor 1 shown in Figure 11 changes to a point-symmetric shape in the center and extends in a counter-clockwise direction. This optical fiber sensor 1 then extends to a position opposite to the position where it reaches the bottom surface B. Even with this shape, the optical fiber sensor 1 is installed with a two-dimensional spread on the bottom surface B. Therefore, this optical fiber sensor 1 can detect the pressure gradient on the bottom surface B.

[0061] <4> In the embodiment described above, the curved portion of the optical fiber sensor 1 on the bottom surface B was spiral-shaped, but it is not limited to this. For example, the optical fiber sensor 1 may have a shape that follows a Lissajous curve as the curved portion on the bottom surface B.

[0062] Figure 12 shows an example of the curved shape of the optical fiber sensor 1 on the base surface B. The optical fiber sensor 1 shown in Figure 12 is laid along a Lissajous curve with a frequency ratio of 1:2 on the base surface B. In this case, the optical fiber sensor 1 connects from the corner that is the endpoint in the -x and +y directions (i.e., the upper left in the figure) to the corner that is the endpoint in the +x and +y directions.

[0063] Figure 13 shows an example of the curved shape of the optical fiber sensor 1 on the base surface B. The optical fiber sensor 1 shown in Figure 13 is laid on the base surface B along a Lissajous curve with a frequency ratio of 1:3. In this case, the optical fiber sensor 1 connects from the corner at the endpoint in the -x and -y directions (i.e., the lower left in the figure) to the corner at the endpoint in the +x and +y directions (i.e., the upper right in the figure).

[0064] Figure 14 shows an example of the curved shape of the optical fiber sensor 1 on the base surface B. The optical fiber sensor 1 shown in Figure 14 is laid along a Lissajous curve with a frequency ratio of 2:3 on the base surface B. In this case, the optical fiber sensor 1 connects from the corner at the endpoint in the +x and -y directions (i.e., the lower right in the figure) to the corner at the endpoint in the +x and +y directions (i.e., the upper right in the figure). In this case, this single optical fiber sensor 1 crosses once on the base surface B.

[0065] Regardless of which of these three Lissajous shapes it has, the optical fiber sensor 1 is installed with a two-dimensional spread on the base surface B. Therefore, this optical fiber sensor 1 can detect the pressure gradient acting on the base surface B.

[0066] Note that these three Lissajous shapes are merely examples. In short, the optical fiber sensor 1 may have a curved portion on its bottom surface B. This optical fiber sensor 1 is an example of an optical fiber sensor having a curved portion on its bottom surface.

[0067] <5> By using this caisson partition wall monitoring system 9, the amount of filling material R placed in each space within the caisson 3, as well as any unevenness in its placement, can be managed. Personnel at the management office and workers equipped with portable terminals can use the caisson partition wall monitoring system 9 at any time to check the height and weight of the filling material R placed in each space separated by the partition walls within the caisson in real time, allowing them to immediately stop the placement when a predetermined weight or height is reached.

[0068] Furthermore, the selection of the space S into which the filling material R is added and the order in which it is added can be selected according to the weight of the water W and filling material R in each space, allowing for stable filling of the filling material R into the caisson 3.

[0069] Alternatively, the caisson bulkhead monitoring system 9 may pre-set the height or weight of the filling material R in each section, and issue an alert to the person in charge or worker when it is determined that the set height or weight has been reached.

[0070] Therefore, this management method is conceived as a method for managing the input of filling material into the caisson partition using the caisson partition monitoring system 9 described above. [Explanation of Symbols]

[0071] 1...Optical fiber sensor, 10...Coating, 11...Core, 111...Detection unit, 1111...Diffraction grating, 12...Cladding, 2...Monitoring device, 21...Control unit, 22...Light source, 23...Optical circulator, 24...Light receiving unit, 3...Caisson, 4...Communication line, 5...Information processing device, 51...Processor, 52...Memory, 53...Interface, 54...Operation unit, 55...Display unit, 9...Caisson partition wall monitoring system, B...Bottom surface, P...Partition wall, R...Filling material, S...Space, W...Water.

Claims

1. A space into which water or filling material is introduced, comprising optical fiber sensors installed on the bottom surface of each partitioned space inside the caisson, A monitoring device that measures the intensity of reflected light by irradiating the optical fiber sensor with light, and monitors the magnitude of the force the optical fiber sensor receives from water or filling material at the bottom surface, and the location where the force is received. A monitoring system inside a caisson partition.

2. The monitoring device detects the gradient of the force based on the magnitude and location of the monitored force. The caisson partition wall monitoring system according to claim 1.

3. The optical fiber sensor further has a portion that extends in the depth direction along the wall of the space, The monitoring device uses the portion of the optical fiber sensor installed on the wall to detect the height of the filling material and the portion installed on the bottom surface to calculate the shape of the filling material being placed inside. The caisson partition wall monitoring system according to claim 1.

4. The portion of the optical fiber sensor provided on the wall is located in the corner of the space. The caisson partition wall monitoring system according to claim 3.

5. The portion of the optical fiber sensor installed on the bottom surface is arranged on the bottom surface in a spiral or Lissajous curve shape. The caisson partition wall monitoring system according to any one of claims 1 to 4.

6. The portion of the optical fiber sensor installed on the bottom surface is installed along the bottom surface to the opposing position. The caisson partition wall monitoring system according to any one of claims 1 to 4.

7. The portion of the optical fiber sensor installed on the bottom surface has a curved portion. The caisson partition wall monitoring system according to claim 1.

8. The optical fiber sensors installed in the space consist of multiple fibers, with at least one fiber installed on each of the adjacent pairs of partition walls in the space. The optical fiber sensors installed on each of the pair of partition walls reach the bottom surface of the caisson, cross each other on the bottom surface, and are installed up to the opposing partition wall. The caisson partition wall monitoring system according to claim 3.

9. A space into which water or filling material is introduced, comprising optical fiber sensors installed in each of the partitioned spaces inside the caisson so as to extend along the walls in the depth direction, A monitoring device that detects the planar height of the filling material by detecting light incident on the optical fiber sensor and measuring the intensity of the reflected light, and by monitoring the magnitude of the force that the optical fiber sensor receives from the filling material on the wall and the position where the force is received. A monitoring system inside a caisson partition.

10. The optical fiber sensor is installed so as to extend in the depth direction along each of the different walls of the space. The caisson bulkhead monitoring system according to claim 9.

11. A method for managing the loading of filling material into a caisson partition using the caisson partition monitoring system described in any one of claims 1 to 10.

Images