Temporary Cofferdam Attitude Control System

Abstract

This invention provides a temporary cofferdam posture control system that reduces the number of measuring instruments required to manage the posture of the temporary cofferdam. [Solution] The attitude control system 1 for a temporary cofferdam 3 comprises a water filling / draining device 10 for filling and draining a water reservoir 4 inside the temporary cofferdam 3, an external distance measuring device 20 provided on the upper part of the temporary cofferdam 3, and a control device 50. The control device 50 comprises a slope calculation unit 52 that calculates the slope of the temporary cofferdam 3 with respect to the water surface based on the distance from the external distance measuring device 20 to the water surface, and a slope adjustment unit 53 that adjusts the slope of the temporary cofferdam 3 by operating the water filling / draining device 10 to fill and drain the water reservoir 4.

Description

Technical Field

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[0001] The present invention relates to a posture control system for a temporary cut-off body.

Background Art

[0002] When reinforcing or repairing underwater parts of structures such as weir columns and bridge piers, after covering the underwater parts of the structure with a temporary cut-off body, a working space is formed on the outer surface side of the structure by draining the space between the structure and the temporary cut-off body. As a method for installing a temporary cut-off body, a method is known in which a floating temporary cut-off body is towed on water and moved to the vicinity of a structure, and then the temporary cut-off body is submerged in water to cover the underwater part of the structure (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, when towing or submerging a temporary cut-off body, the inclination of the temporary cut-off body is measured by an inclination sensor provided on the temporary cut-off body, and the draft of the temporary cut-off body is measured by a draft sensor provided on the temporary cut-off body. In this configuration, it is necessary to install both the inclination sensor and the draft sensor on the temporary cut-off body.

[0005] <0000​​​​​​​To solve the aforementioned problems, the present invention provides a posture control system for a temporary cofferdam for covering the underwater portion of a structure and forming a working space on the outer surface side of the underwater portion of the structure, comprising: a water filling and draining device for filling and draining a plurality of water reservoirs formed inside the temporary cofferdam; a plurality of external distance measuring devices provided on the upper part of the temporary cofferdam; and a control device. The control device comprises: a slope calculation unit for calculating the inclination of the temporary cofferdam with respect to the water surface based on the distance from each of the external distance measuring devices to the water surface; and a slope adjustment unit for adjusting the inclination of the temporary cofferdam by operating the water filling and draining device to fill and drain the water reservoirs.

[0007] In this invention, the draft of the temporary cofferdam can be calculated by measuring the distance from an external distance measuring device to the water surface. Furthermore, in this invention, the slope of the temporary cofferdam can be adjusted by calculating the slope of the temporary cofferdam based on the distances from multiple external distance measuring devices to the water surface and by filling and draining the water into each reservoir. Thus, in this invention, the tilt of the temporary cofferdam can be adjusted using an external distance measuring device for determining the draft of the temporary cofferdam, thus reducing the number of measuring instruments required to manage the attitude of the temporary cofferdam.

[0008] In the attitude control system for the temporary cofferdam described above, an internal distance measuring device is provided at the top of the water storage section. The control device is provided with a water storage volume calculation unit that calculates the amount of water stored in the water storage section based on the distance from the internal distance measuring device to the water surface in the water storage section, and a water storage volume adjustment unit that adjusts the amount of water stored in the water storage section by operating the water filling and draining device to fill and drain the water storage section. With this configuration, a specified amount of water can be accurately stored in each water storage section.

[0009] In the aforementioned attitude control system for the temporary cofferdam, if the water filling and draining device can be remotely operated to fill and drain the water reservoir, safety when filling and draining the temporary cofferdam can be enhanced, and work efficiency can be improved. [Effects of the Invention]

[0010] In the attitude control system for temporary cofferdams of the present invention, both the draft and inclination of the temporary cofferdam are measured using an external distance measuring device. This reduces the number of measuring instruments required to manage the attitude of the temporary cofferdam, and consequently, reduces construction costs. [Brief explanation of the drawing]

[0011] [Figure 1] A side view showing a temporary cofferdam to which the attitude control system according to an embodiment of the present invention is applied. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1, showing a temporary cofferdam to which the attitude control system according to an embodiment of the present invention is applied. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 2, showing a temporary cofferdam to which the attitude control system according to an embodiment of the present invention is applied. [Figure 4] This is a configuration diagram showing an embodiment of the attitude control system of the present invention. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. Figure 1 is a side view showing a temporary cofferdam to which the attitude control system according to an embodiment of the present invention is applied. Figure 2 is a cross-sectional view taken along line II-II of Figure 1, showing a temporary cofferdam to which the attitude control system according to an embodiment of the present invention is applied. As shown in Figure 2, the temporary cofferdam 3 is a cylindrical body made of steel or concrete. In this embodiment, the temporary cofferdam 3 is formed in a C shape when viewed from above. The temporary cofferdam 3 is a floating type that can be launched into the sea or rivers. The temporary cofferdam 3 is towed to the vicinity of a structure 2 such as a weir or bridge pier, and submerged in the water to enclose and cover the underwater portion of the structure 2. Then, by draining water from between the outer surface of the structure 2 and the inner surface of the temporary cofferdam 3, a working space can be created around the underwater portion of the structure 2.

[0013] The temporary cofferdam 3 in this embodiment has a hollow interior. When the amount of water stored inside the temporary cofferdam 3 is less than a specified amount, the temporary cofferdam 3 can float on the water and be towed. Furthermore, by storing a specified amount of water inside the temporary cofferdam 3, it can be installed submerged in water. The internal space at the bottom of the temporary cofferdam 3 is partitioned by multiple partition walls in the circumferential direction, forming multiple water storage sections 4.

[0014] Figure 3 is a cross-sectional view taken along line III-III of Figure 2, showing a temporary cofferdam to which the attitude control system according to an embodiment of the present invention is applied. Figure 4 is a configuration diagram showing the attitude control system according to an embodiment of the present invention. The attitude control system 1 of this embodiment controls the attitude of the temporary cofferdam 3 shown in Figure 1 when towing, sinking, or raising the temporary cofferdam 3. As shown in Figure 3, the attitude control system 1 includes a water supply and drainage device 10 for supplying and draining water to and from the water reservoir 4 of the temporary cofferdam 3, an external distance measuring device 20 provided on the upper part of the temporary cofferdam 3, and an internal distance measuring device 30 provided on the upper part of the water reservoir 4. The attitude control system 1 also includes a control device 50 as shown in Figure 4.

[0015] As shown in Figure 3, the water supply and drainage device 10 includes a compressor 11, a supply and exhaust hose 12 with one end connected to the compressor 11 and the other end connected to the water storage section 4, a supply and exhaust valve 13 provided on the supply and exhaust hose 12, and a water supply and drainage valve 14 provided on the water storage section 4.

[0016] The intake and exhaust hose 12 has one end detachably connected to the intake and exhaust port of the compressor 11, and the other end communicates with the upper part of the internal space of the water reservoir 4. Compressed air can be supplied from the compressor 11 to the water reservoir 4 through the intake and exhaust hose 12. In addition, by disconnecting one end of the intake and exhaust hose 12 from the compressor 11, the air inside the water reservoir 4 can be exhausted from the other end of the intake and exhaust hose 12. The intake / exhaust valve 13 is a solenoid valve installed in the intake / exhaust hose 12, and can be opened and closed remotely by the control device 50 described later. The water injection / drainage valve 14 is a solenoid valve attached to the water injection / drainage port provided at the lower part of the temporary fastening body 3, and can be opened and closed remotely by a control device 50 described later.

[0017] When increasing the water storage amount in the water storage part 4, the air supply / exhaust valve 13 and the water injection / drainage valve 14 are opened, and by removing one end of the air supply / exhaust hose 12 from the compressor 11, the air in the water storage part 4 is exhausted to the outside through the air supply / exhaust hose 12. Thereby, water flows into the water storage part 4 through the water injection / drainage valve 14, and the water storage amount in the water storage part 4 increases. Also, when maintaining the water storage amount in the water storage part 4, the air supply / exhaust valve 13 and the water injection / drainage valve 14 are closed. [[ID=CO]] Also, when decreasing the water storage amount in the water storage part 4, the air supply / exhaust valve 13 and the water injection / drainage valve 14 are opened, and one end of the air supply / exhaust hose 12 is connected to the air supply / exhaust port of the compressor 11, and compressed air is supplied from the compressor 11 into the water storage part 4 through the air supply / exhaust hose 12. Thereby, the water in the water storage part 4 flows out to the outside through the water injection / drainage valve 14, and the water storage amount in the water storage part 4 decreases.

[0018] The external distance measuring device 20 is an optical distance measuring sensor that measures the distance from the external distance measuring device 20 to the water surface outside the temporary fastening body 3. The external distance measuring device 20 is attached to the tip of a support member 21 that protrudes outward from the upper end of the corner part of the temporary fastening body 3. The distance to the water surface measured by the external distance measuring device 20 is output to a control device 50 described later. In the present embodiment, as shown in FIG. 2, external distance measuring devices 20 are provided at the four corner parts of the temporary fastening body 3, respectively. [[ID=MO]]

[0019] As shown in FIG. 3, the internal distance measuring device 30 is an optical distance measuring sensor that measures the distance from the internal distance measuring device 30 to the water surface inside the water storage part 4. The internal distance measuring device 30 is mounted on the upper part of the water reservoir 4. In this embodiment, the internal distance measuring device 30 is mounted on the outside of the temporary cofferdam 3 and measures the distance to the water surface inside the water reservoir 4 through a through hole provided in the ceiling plate of the water reservoir 4. The distance to the water surface measured by the internal distance measuring device 30 is output to the control device 50, which will be described later. In this embodiment, as shown in Figure 2, an internal distance measuring device 30 is provided in each water storage section 4 of the temporary closure body 3.

[0020] The control device 50 shown in Figure 4 is a computer equipped with a CPU, RAM, ROM, display, etc., and the CPU executes programs stored in ROM, etc., to perform the tasks of each component. The control device 50 includes a draft calculation unit 51 for calculating the draft of the temporary cofferdam 3, a slope calculation unit 52 for calculating the slope of the temporary cofferdam 3, and a slope adjustment unit 53 for adjusting the slope of the temporary cofferdam 3. Furthermore, the control device 50 includes a water volume calculation unit 54 for calculating the amount of water stored in the water storage unit 4, and a water volume adjustment unit 55 for adjusting the amount of water stored in the water storage unit 4.

[0021] The draft calculation unit 51 calculates the draft at each of the four corners of the temporary cofferdam 3 based on the distance from each external distance measuring device 20 to the water surface. The distance from the external distance measuring device 20 to the lower end (bottom surface) of the temporary cofferdam 3 is stored in the control device 50 in advance. The draft calculation unit 51 calculates the draft of the temporary cofferdam 3 by subtracting the distance from the external distance measuring device 20 to the water surface from the distance from the external distance measuring device 20 to the lower end of the temporary cofferdam 3.

[0022] The inclination calculation unit 52 calculates the inclination of the temporary cofferdam 3 relative to the water surface based on the distance from each external distance measuring device 20 to the water surface. The inclination calculation unit 52 calculates the inclination of the temporary cofferdam 3 from the difference in draft at each corner of the temporary cofferdam 3 calculated by the draft calculation unit 51. For example, if the draft at each corner of the temporary cofferdam 3 is the same, it means that the temporary cofferdam 3 is not inclined relative to the water surface. Furthermore, the angle of inclination with respect to the horizontal line may be calculated based on the distance from each external distance measuring device 20 to the water surface and the horizontal distance between the external distance measuring devices 20.

[0023] If the slope of the temporary cofferdam 3 calculated by the slope calculation unit 52 is not within the specified range, the slope adjustment unit 53 operates the water filling and draining device 10 to fill and drain water into each water storage section 4, thereby adjusting the slope of the temporary cofferdam 3 so that the slope of the temporary cofferdam 3 falls within the specified range. The specified range of inclination for the temporary cofferdam 3 is the range of inclination that allows the temporary cofferdam 3 to be stably towed, submerged, or floated, and is pre-stored in the control device 50.

[0024] The water storage volume calculation unit 54 calculates the water storage volume of the water storage section 4 based on the distance from the internal distance measuring device 30 to the water surface inside the water storage section 4. The control device 50 has the bottom area and total height of the internal space of the water storage section 4 stored in advance. The water storage volume calculation unit 54 then calculates the water depth of the water stored in the water storage section 4 based on the distance from the internal distance measuring device 30 to the water surface inside the water storage section 4, and calculates the water storage volume of the water storage section 4 by multiplying that water depth by the bottom area.

[0025] If the amount of water stored in each water storage unit 4 calculated by the water storage unit 54 differs from the specified amount, the water storage volume adjustment unit 55 operates the water filling / draining device 10 to fill or drain water into each water storage unit 4, thereby adjusting the amount of water stored in each water storage unit 4 to the specified amount. The specified amount of water stored in the water storage section 4 is the amount of water required to stabilize the temporary cofferdam 3 during towing or sinking, and is pre-stored in the control device 50.

[0026] Next, we will explain how to install the temporary cofferdam 3. After the temporary cofferdam 3 shown in Figure 1 is manufactured in a factory on land, the temporary cofferdam 3 is floated on the water. At this time, the draft of the temporary cofferdam 3 is calculated by the draft calculation unit 51 shown in Figure 4. In addition, the water storage volume calculation unit 54 calculates the water storage volume of each water storage section 4. Then, the water storage volume adjustment unit 55 adjusts the water storage volume of each water storage section 4 to the specified amount for towing. Furthermore, the inclination calculation unit 52 calculates the inclination of the temporary cofferdam 3, and the inclination adjustment unit 53 adjusts the inclination of the temporary cofferdam 3 to within the specified range for towing. In this way, the draft and inclination of the temporary cofferdam 3 are controlled to ensure stable towing of the temporary cofferdam 3.

[0027] As shown in Figure 2, after placing the temporary cofferdam 3 near the structure 2, the water storage volume calculation unit 54 shown in Figure 4 calculates the water storage volume of each water storage section 4, and the water storage volume adjustment unit 55 adjusts the water storage volume of each water storage section 4 to the specified amount for sinking. Then, the draft calculation unit 51 calculates the draft of the temporary cofferdam 3, and after the temporary cofferdam 3 is submerged to a predetermined draft, the inclination calculation unit 52 calculates the inclination of the temporary cofferdam 3. Then, the inclination adjustment unit 53 adjusts the inclination of the temporary cofferdam 3 to within the specified range at the time of installation. In this way, the draft and slope of the temporary cofferdam 3 are controlled to install the temporary cofferdam 3 in a state that surrounds and covers the underwater portion of the structure 2.

[0028] Furthermore, by draining water between the outer surface of structure 2 and the inner surface of temporary cofferdam 3, a working space is formed on the outer side of structure 2. When removing the temporary cofferdam 3 from structure 2, the water storage volume calculation unit 54 calculates the water storage volume of each water storage section 4, and the water storage volume adjustment unit 55 adjusts the water storage volume of each water storage section 4 to the specified amount for floating. Then, the draft calculation unit 51 calculates the draft of the temporary cofferdam 3, and after the temporary cofferdam 3 is brought to a predetermined draft, the inclination calculation unit 52 calculates the inclination of the temporary cofferdam 3. Then, the inclination adjustment unit 53 adjusts the inclination of the temporary cofferdam 3 to within the specified range for towing. In this way, the temporary cofferdam 3 is towed to the next installation location in a stable state.

[0029] In the attitude control system 1 described above, as shown in Figure 1, the draft of the temporary cofferdam 3 can be calculated by measuring the distance from the external distance measuring device 20 to the water surface. Furthermore, in the attitude control system 1 of this embodiment, the inclination of the temporary cofferdam 3 can be calculated based on the distances from multiple external distance measuring devices 20 to the water surface, and the inclination of the temporary cofferdam 3 can be adjusted by filling and draining each water reservoir 4 (see Figure 2). Thus, in the attitude control system 1 of this embodiment, the tilt of the temporary cofferdam 3 can be adjusted using an external distance measuring device 20 for determining the draft of the temporary cofferdam 3. This reduces the number of measuring instruments required to manage the attitude of the temporary cofferdam 3, and consequently, reduces construction costs.

[0030] Furthermore, in the attitude control system 1 of this embodiment, as shown in Figure 3, a specified amount of water can be accurately stored in the water storage section 4 by measuring the distance from the internal distance measuring device 30 to the water surface in the water storage section 4.

[0031] Furthermore, in the attitude control system 1 of this embodiment, the water filling and draining device 10 can be remotely operated to fill and drain the water storage section 4, thereby increasing safety when filling and draining the temporary cofferdam 3 and improving work efficiency.

[0032] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from its spirit. In the attitude control system 1 of this embodiment, as shown in Figure 3, the amount of water stored in the water reservoir 4 is adjusted using an internal distance measuring device 30. However, the amount of water stored in the water reservoir 4 may be adjusted based on the draft of the temporary cofferdam 3 calculated using an external distance measuring device 20, without providing an internal distance measuring device 30.

[0033] In this embodiment, as shown in Figure 2, the case in which the attitude control system of the present invention is applied to a temporary cofferdam 3 arranged around a structure 2 is described. However, the structure of the temporary cofferdam to which the attitude control system of the present invention can be applied is not limited. For example, it can also be applied to temporary cofferdams installed to cover the underwater portion of the wall surface of dams and embankments. [Explanation of Symbols]

[0034] 1. Attitude control system 2 structures 3. Temporary Closure 4. Water storage section 10 Pour and drain device 11 Compressor 12. Intake and exhaust hoses 13. Intake and exhaust valves 14. Inlet and Outlet Valves 20 External ranging device 21 Support member 30 Internal ranging device 50 Control device 51 Draft Calculation Unit 52 Inclination Calculation Unit 53 Tilt adjustment section 54. Water storage volume calculation unit 55 Water storage volume adjustment section

Claims

1. A posture control system for a temporary cofferdam that covers the underwater portion of a structure and forms a working space on the outer surface side of the underwater portion of the structure, A drainage device for pouring water into and out of multiple water storage sections formed within the temporary closure body, Multiple external distance measuring devices are provided on the upper part of the temporary cofferdam, A control device is provided, The control device is An inclination calculation unit calculates the inclination of the temporary cofferdam with respect to the water surface based on the distance from each of the external distance measuring devices to the water surface, A temporary cofferdam attitude control system comprising: a tilt adjustment unit that adjusts the inclination of the temporary cofferdam by operating the water filling and draining device to fill and drain the water reservoir;

2. The water storage section is equipped with an internal distance measuring device located at the top of the section, The control device is A water storage volume calculation unit calculates the amount of water stored in the water storage unit based on the distance from the internal distance measuring device to the water surface in the water storage unit, The posture control system for a temporary cofferdam according to claim 1, further comprising a water volume adjustment unit that adjusts the amount of water stored in the water storage unit by operating the water filling and draining device to fill and drain the water storage unit.

3. The attitude control system for a temporary cofferdam according to claim 1, characterized in that the water filling and draining device can be used to fill and drain the water storage section by remote operation.

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