How to check the pressure status

Abstract

To provide a method for checking a pressing state, which can check the pressing state (sealing state or crimping state) without conducting a test, and can identify in advance a location where there is a possibility of a pressing defect (sealing defect or crimping defect) and take measures to address the problem. [Solution] Pressure-sensitive paper 40 is laid between a sealing member 30 or rubber member and the sealed or crimped portion to which it is to be attached, and the color of the pressure-sensitive paper 40 is checked after the sealing member 30 or rubber member is pressed against the sealed or crimped portion with a predetermined pressure. For example, if the sealing member 30 is disposed between the door body 20 and frame 10 of a watertight door 1, the pressure-sensitive paper 40 is placed between the door body 20 and the sealing member 30, or between the sealing member 30 and frame 10. Also, if the rubber member is to be bolted to a concrete wall, the pressure-sensitive paper 40 is placed between the rubber member and the concrete wall, and the color of the pressure-sensitive paper 40 is checked after the sealing member 30 or rubber member is pressed with a predetermined pressure.

Description

[Technical Field]

[0001] The present invention relates to a method for checking a pressing state at a pressed location that directly or indirectly receives a pressing force applied by a pressing member, such as a sealed location to which a sealing member is crimped. [Background technology]

[0002] The watertight door 1 is installed in an opening formed in a building of a nuclear facility such as a nuclear power plant, and in the event that the outside of the building is flooded by a tsunami or the like, it prevents seawater from flowing into the interior of the building through the opening, thereby preventing flooding of important equipment. In addition, a breakwater has been installed to protect the facility from tsunami waves. In places where watertightness is required, such as the joints of watertight doors and breakwater walls, watertightness is ensured by sealing materials such as waterproof rubber.

[0003] For example, in a watertight door, a waterproof rubber (sealing member) is attached around the entire periphery of the door and around the frame that supports the door's periphery, and this waterproof rubber is crushed with a predetermined pressure to ensure watertightness between the door and the frame (see Patent Document 1). As shown in Figure 7, watertight joints 51 are installed to prevent tsunamis from flowing in through joints 53 between construction blocks of breakwater 50. These watertight joints 51 are installed on the land side of breakwater 50 to prevent damage from collisions with tsunami-caused debris, and use rubber joints as shown in Figure 7(a) or sheet joints as shown in Figure 7(b) depending on the relative displacement between adjacent construction blocks during an earthquake. These rubber joints and sheet joints secure rubber members 55 with steel members (presser plates 56, anchor bolts 57a, nuts 57b) to maintain watertightness. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-59139 Summary of the Invention [Problem to be solved by the invention]

[0005] However, these sealing rubber components such as watertight rubber and joints are manufactured in factories and their watertight performance is confirmed, but when they are manufactured or reassembled on site, it is assumed that watertight performance will be achieved when the sealing rubber components are pressed with a specified pressure, and watertightness tests are not conducted after installation. Seal rubber components demonstrate watertightness by being pressed against the sealed area (steel plate components, concrete wall surfaces, etc.) with a specified pressure, but if the sealed area is not flat and has unevenness, or if the seal rubber component is deteriorated, there is a high possibility of water leakage. For this reason, there is a strong demand for establishing a test method to confirm sealing performance. Furthermore, the above-mentioned poor pressing condition between components is not limited to the sealing performance of watertight doors, but is a common problem in devices, equipment, facilities, etc. that have points where two components press against each other, so there is a demand for the establishment of a test method to confirm the pressing condition between two components.

[0006] The present invention was made in consideration of the above circumstances, and its main objective is to provide a method for checking the pressing state, which does not require testing to check the pressing state such as the sealing state, and which makes it possible to identify areas where there is a possibility of poor pressing (poor sealing) in advance and take measures to address the problem. [Means for solving the problem]

[0007] In order to achieve the above object, a pressing state confirmation method according to the present invention includes a pressing member that applies a pressing force and a pressed portion that directly or indirectly receives the pressing force applied by the pressing member, and is a method for confirming a pressing state at the pressed portion, a pressure-sensitive paper is laid between the pressing member and the pressed portion, and the color of the pressure-sensitive paper is confirmed after a predetermined pressing force is applied by the pressing member; It is characterized by the following.

[0008] Therefore, the pressing state at the pressed area can be grasped by placing pressure-sensitive paper between the pressing member and the pressed area, and checking the color of the pressure-sensitive paper after the pressing member applies a predetermined pressing force to the pressed area. For example, when applying a pressing force by pressing a sealing material, checking the color of the pressure-sensitive paper makes it possible to grasp the sealing performance. Also, when applying a pressing force by pressing a rubber member, checking the color of the pressure-sensitive paper makes it possible to manage the pressing torque value.

[0009] Here, when the method for checking the pressing state is a method for checking the sealing state between the sealing member and the sealed portion to which it is pressed, A pressure-sensitive paper may be laid between the sealing member and the area to be sealed, and the color of the pressure-sensitive paper may be checked after the sealing member is pressed against the area to be sealed with a predetermined pressure.

[0010] Therefore, if the desired sealing performance is achieved, the pressure-sensitive paper will develop the intended color evenly. If the developed color is uneven (there is color unevenness), it is possible to know that the desired sealing performance may not be achieved, and some kind of countermeasure can be taken. Here, when the sealing member is placed between the door body and frame of a sealed door such as a watertight door or an airtight door to maintain a sealed state, the pressure-sensitive paper may be laid between the door body and the sealing member, or between the sealing member and the frame.

[0011] Furthermore, when the method for checking the pressing state is a method for checking the pressing state between the rubber member and the portion to be pressed, A pressure-sensitive paper may be laid between the rubber member and the pressure-bonded portion, and the color of the pressure-sensitive paper may be confirmed after the rubber member is pressed against the pressure-bonded portion with a predetermined pressure force.

[0012] For example, if the rubber member is formed in a sheet shape and is used to press it against the area to be pressed and maintain the pressed state, the pressure-sensitive paper may be laid between the rubber member and the area to be pressed (for example, between the rubber member and a concrete wall).

[0013] Furthermore, when the rubber member is formed in a sheet shape and is used to press against a plate member installed at a location to be pressed and maintain the pressed state, for example, when the rubber member is used to press against a plate member installed on a concrete wall by tightening with bolts and maintain the pressed state, The pressure-sensitive paper may be interposed between the rubber member and the plate member, and also between the plate member and the pressure-bonded portion. In this configuration, the pressure-sensitive paper placed between the rubber member and the plate member makes it possible to grasp deterioration of the rubber member, and the pressure-sensitive paper placed between the plate member and the crimped portion (e.g., a concrete wall) makes it possible to confirm whether sealing performance is not being maintained due to unevenness in the crimped portion.

[0014] The pressure-sensitive paper may be one that changes color depending on the pressure applied. If the color of the pressure-sensitive paper is uneven or if multiple colors are mixed, it can be confirmed that the sealing or pressing state is not uniform. If the color that is developed is different from the intended color, it can be confirmed that the sealing or pressing state is not as intended. [Effects of the Invention]

[0015] As described above, according to the present invention, pressure-sensitive paper is laid between the pressing member and the pressed area, and the color of the pressure-sensitive paper is checked after a predetermined pressing force is applied by the pressing member. This eliminates the need to conduct tests to check the pressing state at the pressed area, and makes it possible to identify areas where there is a possibility of poor pressing in advance and take measures. [Brief explanation of the drawings]

[0016] [Figure 1]1A and 1B are diagrams illustrating an example in which the pressing state confirmation method according to the present invention is applied to a watertight door as a method for confirming sealing performance, where (a) is an oblique view showing a first example in which a sealing member is provided on the frame side of the watertight door, and (b) is an enlarged cross-sectional view of the part where the sealing member and pressure-sensitive paper are provided, cut along line AA in (a). [Figure 2] 10A and 10B are diagrams showing examples of the coloring state of pressure-sensitive paper, where (a) shows an example in which the pressure-sensitive paper is divided into colored and non-colored areas, and (b) shows an example in which the coloring state of the pressure-sensitive paper has shades. [Figure 3] 10A and 10B are diagrams illustrating an example in which different colors are produced depending on the magnitude of pressure applied to pressure-sensitive paper. [Figure 4] 1A and 1B are diagrams illustrating an example in which the pressing state confirmation method according to the present invention is applied to a watertight door as a method for confirming sealing performance, in which (a) is an oblique view showing an example in which a sealing member is provided on the door body side of the watertight door, and (b) is an enlarged cross-sectional view of the part where the sealing member and pressure-sensitive paper are provided, cut along line BB in (a). [Figure 5] 1A and 1B are diagrams illustrating water-stop joints for preventing tsunamis from flowing in through the joints between construction blocks of a breakwater wall, where (a) is a diagram showing the part of the breakwater wall where the water-stop joints are installed, and (b) is a cross-sectional view showing an example of a water-stop joint structure. [Figure 6] 10A and 10B are diagrams showing other configuration examples in which pressure-sensitive paper is attached. [Figure 7] The following diagrams show examples of the configuration of water-stop joints that prevent tsunamis from flowing in through the joints between construction blocks of a breakwater wall. (a) shows an example of a rubber joint, and (b) shows an example of a sheet joint. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] (Embodiment 1) An example in which the present invention is applied to a watertight door installed in a building as a measure to prevent flooding will be shown below. The watertight door 1 has a frame 10 attached to a concrete entrance / exit 101 of a building 100, and a door body 20 that closes an opening 11 provided in the frame 10. The door body 20 is rotatably attached to the frame 10 via hinges 2. The frame 10 has a door stop 12 that is approximately the same size as the opening 11, located around the periphery of the opening 11. The door stop 12 is a steel plate member integrated into the concrete wall, and has an annular groove 13. A seal member 30 serving as a waterproof packing is fitted into this annular groove 13. The seal member 30 is made of an elastic member formed in an endless ring, and is designed to elastically deform when the door body 20 is pressed against it.

[0019] A latch 21 and an opening / closing handle 22 for moving the latch 21 back and forth are attached to the door body 20. The frame 10 is also provided with a latch receiver 15 for locking the latch 21. By closing the door body 20 and operating the opening / closing handle 22 to lock the latch 21 into the latch receiver 15, the door body 20 is pressed against the seal member 30, becoming watertight.

[0020] In this configuration, the sealing member 30 is attached to the groove 13 of the door stop 12 provided in the frame 10 on-site, but it is not possible to visually check the sealing condition between the sealing member 30 and the bottom of the groove 13. It is possible to perform a watertightness test after attaching the sealing member 30 to the groove 13, but installing a testing device would be large-scale and impractical. 1(b), after the sealing member 30 is fitted into the groove 13, pressure-sensitive paper 40 is attached to the surface of the sealing member 30. This pressure-sensitive paper 40 is formed to have a width equal to or greater than the width of the sealing member 30, and is attached around the entire periphery of the sealing member 30.

[0021] Here, the bottom of groove 13 refers to the bottom of groove 13 provided in door stop 12 if groove 13 is a bottomed groove provided in door stop 12, and refers to the part of frame 10 to which door stop 12 is attached that faces groove 13 if groove 13 is formed by a hole that passes through door stop 12.

[0022] The pressure-sensitive paper 40 is known per se, and is, for example, one that includes microcapsules containing a colorless color former and a color developer, and when the microcapsules are broken by pressure, the color former and the color developer inside undergo a chemical reaction to produce color. The pressure-sensitive paper 40 may be divided into areas that develop color and areas that do not develop color depending on the magnitude of pressure, as shown in Fig. 2(a), or may be one that develops different colors depending on the magnitude of pressure, as shown in Fig. 2(b). Furthermore, the pressure-sensitive paper 40 may be one that develops different colors depending on the magnitude of pressure, as shown in Fig. 3.

[0023] The sealing member 30 is composed of an O-ring, a packing, etc., and its cross-sectional shape is not particularly limited. It is fitted to the bottom of the groove 13, and when the door body 20 is not abutting against the door stop 12, it protrudes from the surface of the door stop 12. With the sealing member 30 attached via the pressure-sensitive paper 40 as described above, the door body 20 is rotated via the hinge 2 and pressed against the door stop 12 of the frame body 10, and the opening / closing handle 22 is operated to engage the latch 21 with the latch receiver 15, and the door body 20 is pressed against the sealing member 30 to form a watertight state.

[0024] After maintaining this state for a while, the open / close handle 22 is operated to remove the latch 21 from the latch receiver 15, and the door body 20 is rotated via the hinge 2 to open the opening 11. After that, the color development state of the pressure-sensitive paper 40 attached to the surface of the sealing member 30 is checked.

[0025] In this case, if there are parts of the pressure-sensitive paper 40 that are not colored as shown in Figure 2(a) or have low density as shown in Figure 2(b), it will be possible to confirm that the pressure required to stop water is not being applied to those parts (also, if the color that is being applied is different in some parts, it will be possible to confirm that pressure is not being applied uniformly to those parts). In response to this, areas that are not colored or have changed color may be due to deterioration of the sealing member 30, unevenness at the bottom of the groove 13, or poor installation of the door body 20, so countermeasures will be taken based on this.

[0026] (Modification of the first embodiment) The watertight door 1 described above has been shown as an example in which the seal member 30 is provided on the frame body 10 side, but there is also a type in which the seal member 30 is attached to the door body 20. Figure 4 shows this example, in which the watertight door 1 has a frame body 10 and a door body 20 that closes an opening 11 provided in the frame body 10, and the door body 20 is rotatably attached to the frame body 10 via hinges 2. Here, the seal member 30 is fixed along the entire periphery of the door body 20. This seal member 30 is made of an elastic member formed in an endless ring shape, and is designed to be elastically deformed when the door body 20 is pressed against the door stop 16 of the frame body 10.

[0027] The frame 10 is made of steel and attached to a concrete entrance / exit 101 of a building 100, and a door stop 16 of approximately the same size as the opening 11 is provided on the periphery of the opening 11. The door stop 16 is formed on the inner periphery of the frame 10 as a step against which the periphery of the door body 20 abuts.

[0028] In this example, a latch 21 and an opening / closing handle 22 for moving the latch 21 back and forth are attached to the door body 20. The frame 10 is also provided with a latch receiver 15 for locking the latch 21. By closing the door body 20 and operating the opening / closing handle 22 to lock the latch 21 into the latch receiver 15, the seal member 30 of the door body 20 is pressed against the door stop 16 of the frame body, creating a watertight state. In this example, the pressure-sensitive paper 40 is laid around the entire periphery of the door stop 16 of the frame 10 with which the seal member 30 of the door body 20 abuts.

[0029] With the pressure-sensitive paper 40 attached to the door stop 16 as described above, the door body 20 is rotated via the hinge 2 and pressed against the door stop 16 of the frame body 10, and the opening / closing handle 22 is operated to lock the latch 21 into the latch receiver 15, and the sealing member 30 of the door body 20 is pressed against the door stop 16 to form a watertight state. After maintaining this state for a while, the open / close handle 22 is operated to remove the latch 21 from the latch receiver 15, and the door body 20 is rotated via the hinge 2 to open the opening 11. After that, the color development state of the pressure-sensitive paper 40 attached to the door stop 16 is observed.

[0030] Therefore, even in this case, if there are parts of the pressure-sensitive paper 40 that are not colored or the color that is colored varies in shade, it is possible to confirm that the pressure required to stop water is not being applied to those parts (also, if the color that is being colored varies in parts, it is possible to confirm that pressure is not being applied uniformly to those parts). In response to this, if there are any areas that have not developed color or have changed color, this may be due to poor installation of the sealing portion door body 20, deterioration of the material 30, unevenness of the door stop 16, or poor installation of the door body 20, so it is possible to take countermeasures in anticipation of this.

[0031] (Embodiment 2) In FIG. 5, an example in which the present invention is applied to a water stop joint 51 of a breakwater wall 50 as a measure to prevent flooding is shown below. The watertight joint 51 shown here is an example of a sheet joint 51a that is used when the relative displacement between adjacent construction blocks 52, 52 during an earthquake is large.

[0032] This sheet joint 51a is installed on the land side of the breakwater wall 50 and is equipped with a sheet-shaped rubber member 55, the both side edges of which are fixed to different construction blocks 52 so as to straddle the joint portion 53, thereby preventing the inflow of tsunamis through the joint portion 53. The rubber member 55 is fixed to the breakwater wall 50 as follows: First, the anchor bolt 57a is installed in the breakwater wall 50. Then, the rubber member 55 and the retaining plate 56 are manufactured at a factory with holes drilled to match the positions of the anchor bolts 57a, and these are brought in and installed to fit the anchor bolts 57a. After that, nuts 57b are screwed onto the threads of the anchor bolts 57a, and the nuts 57b are tightened with a torque wrench to press the rubber member 55 against the concrete. At this time, the sealing performance (waterstop performance) of the rubber member 55 can be controlled by controlling the tightening torque value of the nuts 57b.

[0033] Therefore, in this example, as shown in Figure 5(b), pressure-sensitive paper 40 is laid between rubber member 55 and wavebreak wall (concrete wall) 50, and in that state, a retaining plate 56 is placed against rubber member 55, and nuts 57b are tightened from above with a predetermined torque value. Since a large number of such anchor bolts 57a are provided along the joint at predetermined intervals, pressure-sensitive paper 40 is also provided throughout the installation location of the waterstop joint. In other words, pressure-sensitive paper 40 is laid in a strip along joint portion 53 of wavebreak wall 50 so as to cover the locations where anchor bolts 57a will be driven.

[0034] As described above, the rubber member 55 is attached to the breakwater wall 50 via the pressure-sensitive paper 40, and after forming the watertight joint structure shown in FIG. 5(b), the nuts 57b and retaining plate 56 are removed, and the rubber member 55 is removed. This makes it possible to observe the color development state of the pressure-sensitive paper 40 laid between the rubber member 55 and the breakwater wall 50. The portion of the pressure-sensitive paper 40 tightened by the nuts 57b is tightly pressed down, but it is also possible to check whether the pressure required for watertightness (whether the required tightening torque was applied) is being applied to the area between the anchor bolts 57a. Although the above example shows a sheet joint, it is also applicable to the rubber joint configuration shown in FIG. 7(a).

[0035] (Modification of the second embodiment) In the example described above, the sheet-like rubber member 55 is interposed between the pressure plate 56 and the wave break wall 50 (concrete wall surface), and the pressure-sensitive paper 40 is laid between the rubber member 55 and the wave break wall 50 (concrete wall surface), but the order of the rubber member 55, pressure-sensitive paper 40, and pressure plate 56 can be changed as appropriate. For example, as shown in Figure 6, a steel plate member 58 (corresponding to the pressure plate 56) may be attached to the wave break wall 50 (concrete wall surface), and the sheet-like rubber member 55 may be placed on this plate member 58 and tightened in the axial direction of the anchor bolt 57a by a nut 57b. In such a case, a first pressure-sensitive paper 41 may be provided between the rubber member 55 and the plate member 58, and a second pressure-sensitive paper 42 may be provided between the plate member 58 and the wave-break wall 50 (concrete wall surface).

[0036] In this configuration, after tightening, the nut 57b and rubber member 55 are removed to observe the coloring state of the first pressure-sensitive paper 41 between the rubber member 55 and the plate member 58, and the plate member 58 is removed to observe the coloring state of the second pressure-sensitive paper 42 between the plate member 58 and the breakwater 50 (concrete wall surface). If there are any uncolored areas or uneven coloring on the first pressure-sensitive paper 41, this may be due to deterioration of the sealing material, etc. If there are any uncolored areas or uneven coloring on the second pressure-sensitive paper 42, this may be due to unevenness of the concrete wall surface, etc. Then, appropriate measures are taken depending on the coloring state of each pressure-sensitive paper.

[0037] Although examples using pressure-sensitive paper have been shown above as a method for checking watertightness and as a method for managing anchor bolt torque, the above-mentioned method for checking the pressing state using pressure-sensitive paper can be used as a technique for checking the pressing state in devices, equipment, facilities, etc. that have a location where two members press against each other. In other words, it can also be applied to checking the state of locations where management of the pressing state between a pressing member and a pressed member is required, such as locations where airtightness is required or locations that are subject to deformation.

Claims

1. A method for checking a pressing state at a pressed portion, the method comprising: a pressing member that applies a pressing force; and a pressed portion that directly or indirectly receives the pressing force applied by the pressing member, the method comprising: a pressure-sensitive paper is laid between the pressing member and the pressed portion, and the color of the pressure-sensitive paper is confirmed after a predetermined pressing force is applied by the pressing member; A method for checking a pressing state.

2. The method for checking the pressing state is a method for checking the sealing state between the sealing member and the sealed portion to which it is pressed, a pressure-sensitive paper is laid between the sealing member and the area to be sealed, and the color of the pressure-sensitive paper is checked after the sealing member is pressed against the area to be sealed with a predetermined pressing force; 2. The method for checking a pressing state according to claim 1.

3. The sealing member is disposed between the door body and the frame of the sealing door to maintain a sealed state, 3. The method for checking a pressed state according to claim 2, wherein the pressure-sensitive paper is laid between the door body and the seal member, or between the seal member and the frame.

4. The method for checking the pressing state is a method for checking the pressing state between the rubber member and the pressing portion to which the rubber member is to be pressed, a pressure-sensitive paper is laid between the rubber member and the pressure-bonded portion, and the rubber member is pressed toward the pressure-bonded portion with a predetermined pressure, and then the color of the pressure-sensitive paper is confirmed.

2. The method for checking a pressing state according to claim 1.

5. the rubber member is formed in a sheet shape and is used to press the pressure-bonded portion and maintain the pressed state; 5. The method for checking a pressed state according to claim 4, wherein the pressure-sensitive paper is laid between the rubber member and the pressed portion.

6. the rubber member is formed in a sheet shape and is used to press against a plate member placed at the pressure-bonded location to maintain the pressure-bonded state; 3. The method for checking a pressed state according to claim 2, wherein the pressure-sensitive paper is interposed between the rubber member and the plate member, and between the plate member and the pressure-bonded portion.

7. 7. The method for checking a pressing state according to claim 1, wherein the pressure-sensitive paper develops different colors depending on the pressing force.

Images