JP7729591B2 - waterproofing device - Google Patents

Description

This technology relates to waterproof devices.

A conventional structure for laying cables such as power transmission cables and communication cables underground involves connecting multiple manhole chambers with hollow conduits through which the cables are passed. However, conduits can be damaged when they are laid underground or during other underground construction work, and cracks that occur can become an entry point for groundwater to seep into the conduit. Furthermore, gaps between the end bells, which are the openings of the joints connecting the conduits, and the conduits can also become an entry point for groundwater to seep into the conduits. In these cases, there is a risk that the seeping water will enter the manhole chamber through the conduit opening. To prevent this, waterproofing devices are sometimes installed on the conduit openings facing the manhole chamber.

For example, Patent Document 1 discloses a technology for sealing a conduit opening by fitting a tubular waterproofing device into the gap between multiple twisted cables and the inner circumferential surface of the conduit opening. The waterproofing device has a cutting section that can be attached from the outer circumferential side of the cable, and is equipped with a packing body made of an elastic material that has a circumferentially extending hollow chamber that is filled with a filler material. When the hollow chamber is filled with the filler material, the packing body expands radially, causing the outer circumferential surface of the packing body to press against the inner circumferential surface of the conduit, creating a tight seal. This allows for an excellent seal at the conduit opening.

Here, an adhesive layer made of water-swelling rubber is attached to the outer peripheral surface near the cut and to the outer peripheral surface corresponding to the injection tube for injecting the filler. This adhesive layer is flexible and adhesive, and is configured to improve the waterproofing of the waterproof device by increasing the sealing performance of the gap between the outer peripheral surface of the packing body and the inner peripheral surface of the pipeline.

Patent No. 2849069

However, with the technology disclosed in Patent Document 1, when fitting a waterproofing device equipped with an adhesive layer for improving waterproofing into a pipe opening, it is possible that the adhesive layer may get caught on the inner surface of the pipe, and there is a need to improve the ease of fitting.

The present invention was conceived in light of these issues, and the problem that the present invention aims to solve is to provide a waterproofing device that achieves both further improved waterproofing and minimizes any reduction in workability when fitting it into a pipe opening.

In order to solve the above problems, the present invention takes the following measures. First, the first invention is a waterproofing device that can be fitted into a conduit opening into which a cable is inserted, and includes a packing body made of an elastic body that forms a tube sized to fit into the gap between the inner circumferential surface of the conduit opening and the cable, a slit that divides the peripheral wall of the packing body tube in the circumferential direction into two opposing edge portions, thereby allowing the cable to be inserted into the packing body tube between the edge portions, and a hollow structure provided inside the peripheral wall that expands when filled with a filler material. The peripheral wall has a hollow chamber, and the outer peripheral portion of the peripheral wall that faces the outer periphery of the packing body tube has a first portion extending in the circumferential direction and a second portion extending along the first portion and projecting outward beyond the first portion, which are aligned in the axial direction of the packing body tube. The first portion has a sealing material disposed along its outer peripheral surface, which is the outer peripheral surface, and the sealing material has an inner seal surface facing the outer peripheral surface and an outer seal surface on the opposite side of the inner seal surface.

According to the first invention, the waterproofing device can seal the conduit opening by fitting the packing body into the gap between the inner circumferential surface of the conduit opening and the cable, and then filling the hollow chamber with a filler to expand the circumferential wall of the packing body. A sealant is disposed along the outer peripheral surface of a first portion of the circumferential wall of the packing body. The second portion is configured to protrude outward more than the first portion. Therefore, when the waterproofing device is fitted into the conduit opening, the play between the second portion and the inner circumferential surface of the conduit opening is smaller than the play between the first portion and the inner circumferential surface of the conduit opening. Therefore, when the waterproofing device is fitted into the conduit opening, the second portion can be aligned with respect to the inner circumferential surface of the conduit opening with greater positional accuracy than when the first portion is fitted into the conduit opening. This reduces the unevenness in play between the first portion and the inner circumferential surface of the pipe opening, reducing the risk of the sealant getting caught on the inner circumferential surface of the pipe opening. Furthermore, according to the first invention, the sealant in the first portion, where the peripheral wall is expanded, can function as a waterproofing material. Therefore, according to the first invention, it is possible to provide a waterproofing device that achieves both further improved waterproofing and minimizes a decrease in workability when fitting the device into the pipe opening.

The second invention is a waterproofing device according to the first invention, in which the second portion is arranged to protrude outward beyond the outer surface of the seal.

According to the second invention, the second portion of the waterproofing device protrudes outward from the outer seal surface, making it even less likely that the sealing material disposed in the first portion will get caught on the inner surface of the pipe opening. This further improves the ease of fitting the waterproofing device into the pipe opening.

The third invention is a waterproofing device according to the first invention, wherein the sealing material is an elastic body that can be elastically compressed in its thickness direction, and in a natural state where no external force is applied, the outer surface of the seal protrudes outward beyond the second portion, and in the fitted state, the sealing material is in the compressed state and contacts the inner surface of the pipe opening.

According to the third invention, when the waterproofing device is fitted into the pipe opening, the sealing material that protrudes outward from the second portion is pulled axially against the inner surface of the pipe, and is inserted into the pipe in a state where it is elastically compressed in the thickness direction. As a result, the sealing material is compressed in the thickness direction to conform to the inner surface of the pipe, making it less likely to peel off when inserted. Furthermore, according to the third invention, when the waterproofing device is fitted into the pipe opening, even if the pipe opening deforms and its inner diameter changes, the sealing material elastically deforms in the thickness direction. This allows the pipe opening to be appropriately sealed. Therefore, according to the third invention, it is possible to provide a waterproofing device that achieves both improved waterproofing when the pipe opening deforms and minimizes a decrease in workability when fitting into the pipe opening.

A fourth invention is a waterproofing device according to any one of the first to third inventions, in which the first part, the second part, and the sealing material are arranged to surround the entire periphery of the outer peripheral part.

According to the fourth aspect of the invention, the waterproofing device is configured so that the first part, second part, and sealing material surround the entire outer periphery of the packing body, ensuring that the pipe opening is sealed all around.

The fifth invention is a waterproofing device according to the fourth invention, in which the sealing material is wrapped around the entire outer periphery, with the starting and ending ends aligned.

According to the fifth invention, the waterproofing device can be configured so that the sealing material surrounds the entire outer periphery simply by fitting the ring of sealing material onto the outer periphery of the packing body.

The sixth invention is a waterproofing device according to any one of the first to fifth inventions, in which the second part is arranged to sandwich the first part in the axial direction, thereby forming a groove together with the first part.

According to the sixth aspect of the present invention, the waterproofing device is arranged so that the second part sandwiches the first part in the axial direction, thereby forming a groove together with the first part. In this way, when the waterproofing device is fitted into or removed from the pipe opening, the outward-projecting second part makes it difficult for the seal material provided in the groove to come off.

The seventh invention is a waterproofing device according to any one of the first to sixth inventions, in which a lip extends along the second portion and projects outward beyond the second portion, and is arranged in a line covering the second portion from the outside in the axial direction of the tube of the packing body.

According to the seventh invention, when the waterproofing device is fitted, the lip covers the second portion of the packing body tube from the outside in the axial direction. This improves the waterproofing device's function as a waterproofing material.

The eighth invention is a waterproofing device according to any one of the first to seventh inventions, wherein the sealing material is a double-sided seal having adhesive surfaces on both the inner and outer surfaces of the seal.

According to the eighth aspect of the present invention, the waterproofing device uses a double-sided sealant that adheres to both the inner circumferential surface of the pipe opening and the first portion of the packing body. This allows the pipe opening to be sealed.

By incorporating the above configurations, the present invention can provide a waterproofing device that simultaneously improves waterproofing and minimizes any reduction in workability when fitting it into a pipe opening.

1 is a perspective view of a waterproof device 100 according to a first embodiment. FIG. 2 is a front view of the waterproof device 100 of FIG. 1. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. 4 is an enlarged view of a portion IV in FIG. 3 . 4 is a cross-sectional view taken along line VV in FIG. 3. FIG. 10 is a front view of a waterproof device 200 according to a second embodiment. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6. FIG. 8 is an enlarged view of a portion VIII in FIG. 7 . 9 is an enlarged view similar to FIG. 8, showing the hollow chamber 220 filled with filler F10. FIG. 10 is a front view of a waterproof device 300 according to a third embodiment. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10. 12 is an enlarged view of a portion XII in FIG. 11, in which the configuration shown by the virtual lines is shown by the solid lines. FIG. 13 is an enlarged view of a portion XIII in FIG. 11 . FIG. 4 is a front view of a waterproof device 400 according to a modified embodiment of the waterproof device 100 according to the first embodiment. FIG. 10 is a front view of a waterproof device 500 according to a modified embodiment of the waterproof device 300 according to the third embodiment. FIG. 11 is a front view of a waterproof device 600 according to a modified embodiment of the waterproof device 300 according to the third embodiment.

As shown in Figure 1, the waterproofing device 100 according to the first embodiment of the present invention is capable of being fitted into the conduit opening P11 of the conduit P10 into which three cables C10 are inserted in a bundled state. Details of the waterproofing device 100 according to the present invention will be described below, along with the conduit P10, using the drawings.

<Pipeline configuration>
The conduit P10 is formed by disposing a hollow cylindrical power cable protection tube P20 underground and inserting a cable C10, such as a power transmission cable or a communication cable, into the power cable protection tube P20. Both end portions P21 of the power cable protection tube P20 open to manhole chambers (not shown), thereby forming conduit entrances P11 of the conduit P10. The power cable protection tube P20 is made of a material suitable for underground disposition (in this embodiment, for example, plastic such as FRP).

<Pipeline details>
The conduit P10 is a power cable protection pipe P20 used when laying a cable C10, such as a power transmission cable or a communication cable, underground. Here, the power cable protection pipe P20 has a hollow cylindrical shape, and both end portions P21 are connected to respective manhole chambers (not shown). The cylindrical shape is such that an inner peripheral surface P22 is in close contact with the second portion 111C provided in the waterproofing device according to each embodiment of the present invention.

<Waterproofing device according to the first embodiment>
The waterproofing device 100 according to the first embodiment of the present invention is fitted into a conduit opening P11 of a conduit P10 into which a cable C10 is inserted. Specifically, when the waterproofing device 100 is fitted into the conduit opening P11, a packing body 101 is fitted into a gap G10 between the cable C10 and the inner circumferential surface P22 of the power cable protection tube P20, which is the other side (see FIG. 3 ). Then, a filler F10 (see FIG. 4 ) is filled into the hollow chamber 120 (see FIG. 3 ) to expand the peripheral wall 110 (see FIG. 3 ) of the packing body 101. Here, the other side refers to the near side of the conduit P10 in the axial direction (see FIG. 3 ). This allows the waterproofing device 100 to seal the conduit opening P11.

<Configuration of waterproof device>
2, the waterproofing device 100 comprises a packing body 101, a slit 121B formed by dividing a cylindrical peripheral wall 110 of the packing body 101 in the circumferential direction into two opposing edge portions 121, thereby enabling a cable C10 to be inserted into the cylindrical packing body 101 through the gap between the edge portions 121, and a hollow chamber 120 having a hollow structure formed inside the peripheral wall 110 and filled with a filler F10 (see FIG. 4) to expand the peripheral wall 110. The packing body 101, the slit 121B, the cable C10, and the hollow chamber 120 will be described below.

<Configuration of packing body>
As shown in Figure 3, the packing body 101 functions as a water-stopping material. The packing body 101 is configured so that it can be fitted into the gap G10 with the axial direction of its tube aligned with the axial direction of the conduit P10. Therefore, the packing body 101 is made of a cylindrical elastic body and is sized to be fitted into the gap G10 between the inner circumferential surface P22 of the power cable protection tube P20 on the other side and the cable C10. Here, the inner diameter of the inner circumferential portion 110A of the peripheral wall 110 of the packing body 101, which is the inner circumferential side of the tube of the packing body 101, is appropriately set so as to accommodate three cables C10.

<Details of the packing body>
As shown in FIGS. 2 and 5 , a first seal body 101B having adhesive properties is fitted into the gap (not shown) between the inner circumferential portion 110A of the packing body 101 and each cable C10. The first seal body 101B forms an arc-shaped seal surface 101C that adheres to the outer circumferential wall C11 of each cable C10 and is integrally provided on the inner circumferential portion 110A. The first seal body 101B has a pair of mating surfaces 101D, which are opposing surfaces that divide the first seal body 101B in the circumferential direction, and a bonding layer 103 that bonds these surfaces together. The mating surface 101D extends from one of the contact surfaces C11A where the two cables C10 contact each other. The first seal body 101B is made of liquid rubber (e.g., flexible and adhesive polybutadiene rubber in this embodiment) that can be easily reshaped to fit cables of various shapes. This allows the first seal body 101B to deform appropriately under pressure due to the expansion of the peripheral wall 110, which will be described later. The pair of joining surfaces 101D forms a surface that extends from the contact surface C11A where the two cables C10 come into contact to the edge portion 121. This allows the pair of joining surfaces 101D to receive appropriate pressure even if the degree of deformation of the edge portion 121, which will be described later, when the peripheral wall 110 expands is smaller than that of the body wall portion 123 (see FIG. 4). The adhesive surface of the joining layer 103 to which the pair of joining surfaces 101D are joined is made of water-swelling rubber (in this embodiment, for example, butyl rubber having adhesive properties that allow it to adhere tightly when pressed).

Furthermore, as shown in Figures 3 and 4, the peripheral wall 110 of the packing body 101 has a peripheral portion 111, which is the outer peripheral side of the cylinder of the packing body 101, and the second portion 111C is provided in a state where it is arranged side by side so as to sandwich the first portion 111A (see Figure 4) in the axial direction of the cylinder of the packing body 101. Here, in this embodiment, the second portion 111C is provided in a state where it protrudes outward more than the first portion 111A. Each portion will be explained below.

<Configuration of the first part>
4, the first portion 111A is provided on the peripheral wall 110 so as to surround the entire periphery of the outer peripheral portion 111, which is the outer peripheral side of the cylinder of the packing body 101. Here, the first portion 111A is provided with a first seal material 112 along its outer peripheral surface 111B, which is its outer peripheral surface. Here, the first seal material 112 corresponds to the "seal material" in the present invention.

<Configuration of First Sealing Material>
The first sealant 112 is formed by wrapping a double-sided tape seal around the entire periphery of the outer peripheral surface 111B of the first portion 111A, with the start and end of the seal aligned. In this embodiment, the double-sided seal of the first sealant 112 has adhesive surfaces on both the front and back sides. These adhesive surfaces are made of water-absorbing and swelling rubber (e.g., adhesive butyl rubber in this embodiment), which is the same material as the adhesive surface of the bonding layer 103 (see FIG. 2).

<Details of the first sealing material>
The first seal material 112 is arranged with its rear surface facing the outer peripheral surface 111B of the first portion 111A and bonded to this outer peripheral surface 111B, thereby forming the rear surface as the inner seal surface 112A. In this case, the front surface of the first seal material 112 (i.e., the surface opposite to the inner seal surface 112A) forms the outer seal surface 112B, which is the bonding surface facing outward from the cylinder of the packing body 101. In other words, the inner seal surface 112A and the outer seal surface 112B of the first seal material 112 have bonding surfaces.

Here, the seal outer surface 112B is positioned further back toward the first portion 111A than the second portion 111C. With this configuration, the first seal material 112 is inserted through the conduit P10 (see Figure 3) without being easily caught on the inner surface P22 of the power cable protection tube P20 (see Figure 3).

<Configuration of the second part>
The second portion 111C extends along the axial direction of the cylinder of the packing body 101 (see FIG. 3 ) and is provided in a state in which it protrudes outward more than the first portion 111A. Here, the second portion 111C is provided so as to surround the entire circumference of the outer peripheral portion 111, which is the outer peripheral side of the cylinder of the packing body 101, in the peripheral wall 110. In this embodiment, the protrusion of the second portion 111C is adjusted to a size and shape that allows it to be fitted in close contact with the inner peripheral surface P22 of the pipeline P10 (see FIG. 3 ).

The second portion 111C is arranged next to the first portion 111A in the axial direction (see Figure 4) on the cylindrical packing body 101. As a result, the second portion 111C, together with the first portion 111A, forms a groove 111D that opens radially outward (see Figure 4) on the cylindrical packing body 101.

<Slit configuration>
2 and 5, the slit 121B is formed by two opposing edge portions 121 that divide the cylindrical peripheral wall 110 of the packing body 101 in the circumferential direction. This makes it possible to insert the cable C10 into the cylindrical packing body 101 by passing it between the edge portions 121 of the slit 121B.

<Configuration of Edge Portion>
Here, the edge portions 121 are portions that close the edges of the peripheral wall 110 at the circumferential end sides of the packing body 101. The opposing surfaces 121A of the two opposing edge portions 121 are provided with bonding layers 103 that are pressed together to form a tight contact state.

<Cable configuration>
As shown in Figures 2 and 5, three cables C10 are present in the first embodiment. A second seal body 102, which is deformed by the pressure of each cable C10 and has adhesive properties, is tightly attached to the core space G12 surrounded by the three cables C10. As shown in Figures 1 and 3, the three cables C10 are arranged so as to extend linearly parallel to the axial direction of the conduit P10 (see Figure 3). However, the three cables C10 may also be arranged in a twisted spiral configuration (not shown). The second seal body 102 is made of water-swelling rubber (e.g., highly adhesive butyl rubber in this embodiment).

<Configuration of the void room>
As shown in Fig. 4, the hollow chamber 120 has a hollow structure provided inside the peripheral wall 110, and is filled with a filler material F10 to expand the peripheral wall 110. Here, as shown in Figs. 2 and 3, an injection pipe 120A for filling the filler material F10 into the hollow chamber 120 and a handle 101A for gripping the waterproofing device 100 are provided in a mutually opposing manner on an end wall portion 122 (see Fig. 3) on the other side of the tube of the packing body 101.

<Vacant room details>
As shown in Fig. 5, the hollow chamber 120 is provided along the circumferential direction inside the peripheral wall 110. Here, as shown in Figs. 3 and 4, the hollow chamber 120 is sandwiched between a body wall portion 123 (see Fig. 4) in the radial direction and an end wall portion 122 (see Fig. 4) in the axial direction, and the edges of the body wall portion 123 and the end wall portion 122 are closed between the edges of the body wall portion 123 and the end wall portion 122 in the circumferential direction by edge portions 121 (see Fig. 5). Here, the first portion 111A (see Fig. 4) is the outer peripheral portion 111 on the outer peripheral side of the body wall portion 123, and the second portion 111C is the outer peripheral portion 111 on the outer peripheral side of the end wall portion 122. The body wall 123 is made of a soft rubber material (in this embodiment, for example, chloroprene rubber with a hardness of about 55°), while the end wall 122 and the edge 121 are made of a hard rubber material (in this embodiment, for example, chloroprene rubber with a hardness of about 70°). Therefore, when the hollow chamber 120 is filled with the filler F10 (see FIG. 4 ) and the peripheral wall 110 expands, the degree of deformation of the end wall 122 and the edge 121 is smaller than the degree of deformation of the body wall 123.

<Configuration of the injection tube and handle>
As shown in FIGS. 1 and 3, the injection tube 120A for filling the hollow chamber 120 with the filler material F10 (see FIG. 4) protrudes from the end wall portion 122 to the other side (see FIG. 3). An injection valve 120B is attached to the tip of the injection tube 120A, and the filler material F10 can be injected into the injection valve 120B to expand the cylindrical peripheral wall 110 of the packing body 101. The handle 101A has the same outer diameter and protruding length as the injection tube 120A. This allows the waterproofing device 100 to be easily fitted into or removed from the conduit opening P11 by gripping the injection tube 120A and the handle 101A with approximately equal gripping force.

<Filler Composition>
As shown in Fig. 4, the filler F10 is filled into the hollow chamber 120 through an injection pipe 120A (see Fig. 3). Here, a material having fluidity (e.g., silicone liquid in this embodiment) is used as the filler F10.

<Installing the waterproof device>
When assembling the waterproofing device 100 according to the first embodiment described above between the conduit opening P11 and the cable C10, the worker performs the assembling process in the following manner.

First, the worker inserts the second seal body 102 into the core space portion G12 of each cable C10, as shown in Figure 2. This brings each cable C10 and the second seal body 102 into close contact.

Next, the worker widens the slits 121B of the packing body 101 and inserts each cable C10, with the second seal body 102 in close contact, into the tube of the packing body 101. At this point, each cable C10 is fitted into the seal surface 101C of the first seal body 101B, which is integrated with the packing body 101. This brings each cable C10 into close contact with the packing body 101.

After each cable C10 has been fitted into the tube of the packing body 101, the worker attaches the first sealant 112 to the first portion 111A of the packing body 101, as shown in Figure 4. Here, the first sealant 112 is wrapped around the entire outer surface 111B of the first portion 111A so that its starting end and ending end are aligned.

Then, as shown in Figures 1 and 3, the worker fits the waterproofing device 100 into the pipe opening P11. Here, the worker holds the injection tube 120A and the handle 101A of the waterproofing device 100 approximately evenly, and then fits the waterproofing device 100 into the pipe opening P11.

When the waterproofing device 100 is fitted into the conduit opening P11, the play between the second portion 111C and the inner circumferential surface P22 of the conduit opening P11 is smaller than the play between the first portion 111A (see FIG. 4) and the inner circumferential surface P22 of the conduit opening P11. Therefore, when the waterproofing device 100 is fitted into the conduit opening P11, the second portion 111C aligns with the inner circumferential surface P22 of the conduit opening P11 with greater positional accuracy than when the first portion 111A is fitted into the conduit opening P11. This reduces the deviation in play between the first portion 111A (see FIG. 4) and the inner circumferential surface P22 of the conduit opening P11, making it less likely that the first sealant 112 will get caught on the inner circumferential surface P22 of the conduit opening P11.

Furthermore, because the second portion 111C is arranged to sandwich the first portion 111A (see FIG. 4), the second portion 111C slides on the inner circumferential surface P22 of the conduit opening P11. As a result, while the second portion 111C slides on the inner circumferential surface P22 of the conduit opening P11, the packing body 101 is inserted into the conduit P10 while suppressing axial wobble of the tube. Furthermore, because the first sealant 112 (see FIG. 4) is disposed in the groove 111D (see FIG. 4) formed by the second portion 111C and the first portion 111A, when the waterproofing device 100 is fitted into or removed from the conduit opening P11, even if the first sealant 112 is turned up, it will catch on the second portion 111C and will not easily come off.

After fitting the waterproofing device 100 into the pipe opening P11, the worker fills the hollow chamber 120 with filler material F10 (see FIG. 4) through the injection valve 120B of the injection pipe 120A, as shown in FIG. 3. As a result, as shown in FIGS. 4 and 5, the body wall portion 123 deforms and the peripheral wall 110 expands radially along the length of the packing body 101. As a result, the first seal body 101B deforms appropriately due to the pressure caused by the expansion of the peripheral wall 110. The first portion 111A of the packing body 101 then approaches the inner circumferential surface P22, and the first seal material 112 (see FIG. 4) disposed in the first portion 111A adheres to the inner circumferential surface P22. This allows the adhered first seal material 112 to function as a waterproofing material against water in the pipe P10 (see FIG. 3) on one side (see FIG. 3). In this case, the pair of mating surfaces 101D of the first seal body 101B forms a surface that extends from the contact surface C11A where the two cables C10 come into contact to the edge portion 121, and exerts pressure on each other. Here, "one side" refers to the side that is the farthest in the axial direction of the conduit P10 (see Figure 3).

When the filler F10 is filled into the hollow chamber 120, the second portion 111C warps outward in the axial direction of the packing body 101, as shown in Figure 4. This results in the formation of a minute gap G11 between the inner circumferential surface P22 and the second portion 111C.

This completes the assembly of the waterproofing device 100 to the pipe opening P11. When the cylindrical peripheral wall 110 of the packing body 101 expands, it presses against the joining surface 101D of the first seal body 101B and the opposing surface 121A of the edge portion 121, as shown in Figures 2 and 5. This allows the joining surface 101D and the opposing surface 121A to be in tight contact with each other via the joining layer 103.

<Actions and Effects>
According to the waterproofing device 100 described above, the packing body 101 is fitted into the gap G10 between the inner circumferential surface P22 of the conduit opening P11 and the cable C10, and then the hollow chamber 120 is filled with the filler F10 to expand the peripheral wall 110 of the packing body 101, thereby sealing the conduit opening P11. A first sealant 112 is disposed along the outer peripheral surface 111B of the first portion 111A of the peripheral wall 110 of the packing body 101. The second portion 111C is configured to protrude outward more than the first portion 111A. Therefore, when the waterproofing device 100 is fitted into the conduit opening P11, the play between the second portion 111C and the inner circumferential surface P22 of the conduit opening P11 is smaller than the play between the first portion 111A and the inner circumferential surface P22 of the conduit opening P11. Therefore, when the waterproofing device 100 is fitted into the conduit opening P11, the second portion 111C can be aligned with the inner circumferential surface P22 of the conduit opening P11 with higher positional accuracy than when the first portion 111A is fitted into the conduit opening P11. This reduces the deviation in play between the first portion 111A and the inner circumferential surface P22 of the conduit opening P11, thereby reducing the risk of the first sealant 112 getting caught on the inner circumferential surface P22 of the conduit opening P11. Furthermore, with the waterproofing device 100 described above, the first sealant 112 in the first portion 111A, where the peripheral wall 110 is expanded, can function as a waterproofing material. Therefore, it is possible to provide a waterproofing device 100 that further improves waterproofing while improving the ease of fitting into the conduit opening P11.

In the waterproofing device 100 described above, the second portion 111C of the waterproofing device 100 protrudes further outward than the seal outer surface 112B, making it even less likely that the first seal material 112 disposed in the first portion 111A will get caught on the inner surface P22 of the pipe opening P11. This further improves the ease of fitting the waterproofing device 100 into the pipe opening P11.

In the waterproofing device 100 described above, the first portion 111A, the second portion 111C, and the first sealant 112 are arranged to surround the entire outer periphery 111 of the packing body 101, ensuring that the pipe opening P11 is sealed all around.

With the waterproofing device 100 described above, the first seal material 112 can be made to surround the entire outer periphery 111B simply by fitting the ring of the first seal material 112 onto the outer periphery 111 of the packing body 101.

In the waterproofing device 100 described above, the second part 111C is arranged to axially sandwich the first part 111A, thereby forming the groove 111D together with the first part 111A. As a result, when the waterproofing device 100 is fitted into or removed from the pipe opening P11, the outward-projecting second part 111C makes it difficult for the first sealant 112 provided in the groove 111D to come off.

In the waterproofing device 100 described above, the first sealant 112 is a double-sided seal, so it adheres to both the inner circumferential surface P22 of the pipe opening P11 and the first portion 111A of the packing body 101. This allows the pipe opening P11 to be sealed.

<Waterproofing device according to the second embodiment>
Next, the configuration of a waterproof device 200 according to a second embodiment of the present invention will be described with reference to Figures 6 to 9. The waterproof device 200 according to the second embodiment is a modified version of the waterproof device 100 according to the first embodiment. Therefore, components common to the waterproof device 100 according to the first embodiment are designated by reference numerals obtained by adding "100" to the reference numerals designated to the components of the waterproof device 100 according to the first embodiment, and detailed descriptions thereof will be omitted.

<Configuration of packing body>
As shown in Figure 7, the packing body 201 functions as a water-stopping material. The packing body 201 is configured so that it can be fitted into the gap G20 with the axial direction of its tube aligned with the axial direction of the conduit P10. Therefore, the packing body 201 is made of a cylindrical elastic body and is sized to be fitted into the gap G20 between the inner circumferential surface P22 of the power cable protection tube P20 on the other side and the cable C20. Here, the inner diameter of an inner circumferential portion 210A of the peripheral wall 210 of the packing body 201, which is the inner circumferential side of the tube of the packing body 201, is appropriately set so as to be able to accommodate the cable C20.

<Details of the packing body>
As shown in Fig. 6 , an adhesive layer 201B having adhesive properties is adhered to a gap (not shown) between the inner peripheral portion 210A of the packing body 201 and the cable C20. The adhesive layer 201B adheres to the outer peripheral wall C21, which is the outer surface of the cable C20, and also adheres to the inner peripheral portion 210A. Here, the adhesive surfaces of the adhesive layers (not shown) to which the adhesive layer 201B adheres are made of water-absorbing swelling rubber (in this embodiment, for example, adhesive butyl rubber), which is the same material as the adhesive surface of the above-mentioned bonding layer 103 (see Fig. 2 ).

Furthermore, in the peripheral wall 210 of the packing body 201, the outer peripheral portion 211, which is the outer peripheral side of the cylinder of the packing body 201, is provided with a second portion 211C arranged side by side so as to sandwich the first portion 211A (see Figure 8) in the axial direction of the cylinder of the packing body 201, as shown in Figure 7.

<Configuration of the first part>
As shown in Fig. 8, the first portion 211A is provided on the peripheral wall 210 so as to surround the entire periphery of the outer peripheral portion 211, which is the outer peripheral side of the tube of the packing body 201. Here, the first portion 211A is provided with a second seal material 212 along its outer peripheral surface 211B, which is its outer peripheral surface. This second seal material 212 corresponds to the "seal material" in the present invention, and is provided in place of the first seal material 112 (see Fig. 4) provided in the first portion 111A (see Fig. 4) in the waterproofing device (see Fig. 1) according to the first embodiment.

<Configuration of second sealing material>
The second seal 212 has an annular shape that surrounds the entire outer circumferential surface 211B of the first portion 211A. The second seal 212 is an elastic body that can be elastically compressed in the thickness direction. The surface of the second seal 212 facing the outer circumferential surface 211B of the first portion 211A is an inner seal surface 212A, and the surface opposite the inner seal surface 212A is an outer seal surface 212B. When the second seal 212 is in its natural state, in which no external force is applied, the outer seal surface 212B protrudes outward beyond the second portion 211C. Therefore, when the waterproofing device 200 (see FIG. 7) is fitted into the pipe opening P11 (see FIG. 7), the second seal 212 is in a compressed state and contacts the inner circumferential surface P22 of the pipe opening P11. Here, an adhesive surface is set on a seal inner surface 212A of the second seal material 212 that faces the outer peripheral surface 211B of the first portion 211A. The second seal material 212 uses an elastic material (in this embodiment, for example, an EPDM foam material) as a base material, and uses a water-absorbing swelling rubber (in this embodiment, for example, butyl rubber having adhesive properties) as an adhesive surface, which is the same material as the adhesive surface of the above-mentioned bonding layer 103 (see FIG. 2 ).

<Cable configuration>
As shown in FIG. 6, the cable C20 according to this embodiment is one cable.

<Installing the waterproof device>
When assembling the waterproofing device 200 according to the second embodiment described above between the conduit opening P11 and the cable C20, the worker assembles it in the following manner.

First, the worker opens the slit 221B of the packing body 201 and inserts the cable C20 into the tube of the packing body 201. At this point, the adhesive layer 201B is first adhered to the inner peripheral portion 210A of the packing body 201. The adhesive layer 201B may also be first adhered to the outer peripheral wall C21 of the cable C20. This ensures that the cable C20 and the packing body 201 are in close contact with each other.

After the cable C20 is fitted into the tube of the packing body 201, the worker attaches the second sealant 212 to the first portion 211A of the packing body 201, as shown in Figure 8. Here, the second sealant 212 is wrapped around the entire outer surface 211B of the first portion 211A so that its starting end and ending end are aligned.

Then, as shown in Figure 7, the worker fits the waterproofing device 200 into the pipe opening P11. Here, the worker holds the injection tube 220A and the handle 201A of the waterproofing device 200 approximately evenly, and then fits the waterproofing device 200 into the pipe opening P11.

When the waterproofing device 200 is fitted into the conduit opening P11, the second part 211C, which sandwiches the first part 211A (see FIG. 8), slides over the inner circumferential surface P22 of the conduit opening P11. The outer seal surface 212B (see FIG. 8) of the second seal material 212 (see FIG. 8) disposed on the first part 211A is arranged to protrude radially outward from the second part 211C. As a result, as shown in FIG. 8, the second seal material 212 is pulled axially against the inner circumferential surface P22 of the conduit opening P11 (see FIG. 7), and is inserted through the conduit P10 (see FIG. 7) in a state elastically contracted in the thickness direction. This allows the second seal material 212 to conform to the inner circumferential surface P22 of the conduit P10 and contract in the thickness direction, making the inserted second seal material 212 less likely to curl up.

When the waterproofing device 200 is fitted into the pipe opening P11 (see Figure 7), the second sealant 212 is compressed and comes into contact with the inner surface P22 of the pipe opening P11.

After fitting the waterproofing device 200 into the pipe opening P11, the worker fills the hollow chamber 220 with filler material F10 (see FIG. 9) through the injection valve 220B of the injection pipe 220A, as shown in FIG. 7. When the hollow chamber 220 is filled with filler material F10, the body wall portion 223 deforms, as shown in FIG. 9. The peripheral wall 210 then expands in the thickness direction. This causes the first portion 211A of the packing body 201 to approach the inner circumferential surface P22, and the second sealant 212 disposed in the first portion 211A is further compressed between the inner circumferential surface P22 and the first portion 211A. This allows the further compressed second sealant 212 to function as a waterproofing material against water in the pipe P10 (see FIG. 7) on one side (see FIG. 7).

This completes the assembly of the waterproofing device 200 to the pipe opening P11. As the cylindrical peripheral wall 210 of the packing body 201 expands, it presses against the opposing surface 221A of the edge portion 221, as shown in Figure 6. This allows the opposing surface 221A to be tightly attached by the bonding layer 203.

<Changes in pipe opening over time>
As shown in FIG. 7, when the pipe opening P11 is sealed by the waterproofing device 200, the pipe opening P11 may deform due to environmental changes. For example, changes in the environmental temperature or the application of external forces may cause the pipe opening P11 to deform and its inner diameter to change. Even in such cases, the deformable, compressed second sealant 212 (see FIG. 9) deforms appropriately in its thickness direction (see FIG. 9). This allows the second sealant 212 to function as a waterproofing material against water in the pipe P10 on one side.

<Actions and Effects>
According to the waterproofing device 200 described above, when the waterproofing device 200 is fitted into the conduit opening P11, the second sealant 212, which protrudes outward beyond the second portion 211C, is pulled axially against the inner circumferential surface P22 of the conduit P10. As a result, the second sealant 212 is elastically contracted in the thickness direction as it passes through the conduit P10. This allows the second sealant 212 to conform to the inner circumferential surface P22 of the conduit P10 and contract in the thickness direction, making it less likely to curl up. Furthermore, even if the conduit opening P11 deforms and its inner diameter changes when the waterproofing device 200 is fitted into the conduit opening P11, the second sealant 212 elastically deforms in the thickness direction. This allows the conduit opening P11 to be appropriately sealed. Therefore, it is possible to provide a waterproofing device 200 that achieves both improved waterproofing when the pipe opening P11 is deformed and suppresses a decrease in workability when fitting the waterproofing device 200 into the pipe opening P11.

<Waterproofing device according to the third embodiment>
Next, the configuration of a waterproof device 300 according to a third embodiment of the present invention will be described with reference to Figures 10 to 13. The waterproof device 300 according to the third embodiment is a modified version of the waterproof device 100 according to the first embodiment. Therefore, components common to the waterproof device 100 according to the first embodiment are designated by reference numerals obtained by adding "200" to the reference numerals designated to the components of the waterproof device 300 according to the first embodiment, and detailed description thereof will be omitted.

<Configuration of packing body>
As shown in Figure 11, the packing body 301 functions as a water-stopping material. The packing body 301 is configured so that it can be fitted into the gap G30 with the axial direction of its tube aligned with the axial direction of the conduit P10. Therefore, the packing body 301 is made of a cylindrical elastic body and is sized to be fitted into the gap G30 between the inner circumferential surface P22 of the power cable protection tube P20 on the other side and the cable C30. Here, the inner diameter of an inner circumferential portion 310A of the peripheral wall 310 of the packing body 301, which is the inner circumferential side of the tube of the packing body 301, is appropriately set so as to accommodate even when three cables C30 are used.

<Details of the packing body>
As shown in FIG. 10 , a first seal 301B with adhesive properties is fitted into the gap (not shown) between the inner peripheral portion 310A of the packing body 301 and each cable C30. The first seal 301B forms an arc-shaped sealing surface 301C that adheres to the outer peripheral wall C31, which is the outer surface of each cable C30, and is integrally provided on the inner peripheral portion 310A. The first seal 301B has a pair of joining surfaces 301D, which are opposing surfaces that divide the first seal 301B circumferentially, and a joining layer 303 where these surfaces are joined together. The first seal 301B is made of liquid rubber (e.g., flexible and adhesive polybutadiene rubber in this embodiment) that can be easily reshaped to fit cables of various shapes. This allows the first seal 301B to deform appropriately under pressure caused by the expansion of the peripheral wall 310, which will be described later. Furthermore, the angle 301F of the ridge 301E formed by the sealing surface 301C and the joining surface 301D in the first seal body 301B is set to an angle of 90° or greater. This makes it easier for the liquid rubber to enter the ridge 301E formed by the sealing surface 301C and the joining surface 301D compared to when the angle 301F is an acute angle. This improves the formability of the first seal body 301B. The adhesive surface of the joining layer 303 where the pair of joining surfaces 301D are joined is made of a water-absorbing and swelling rubber (e.g., butyl rubber, which has adhesive properties that allow it to adhere when pressed) that is the same material as the above-described joining layer 103 (see FIG. 2).

<Configuration of the second part>
As shown in FIG. 11 , the second portion 311C extends along the axial direction of the cylinder of the packing body 301 and is provided so as to protrude outward more than the first portion 311A (see FIG. 12 ). The second portion 311C is provided side by side so as to sandwich the first portion 311A in the axial direction. As a result, the second portion 311C and the first portion 311A form a groove 311D (see FIG. 12 ). The second portion 311C is also provided so as to surround the entire circumference of the outer peripheral portion 311, which is the outer peripheral side of the cylinder of the packing body 301, in the peripheral wall 310.

<Details of the second part>
As shown in FIG. 12, a lip 311E is attached to the second portion 311C so as to extend along the second portion 311C and protrude outward beyond the second portion 311C. The lip 311E is arranged in a line so as to cover the second portion 311C from the outside in the axial direction of the tubular packing body 301. As a result, when the peripheral wall 310 expands in the fitted state, the lip 311E covers the minute gap G31 (see FIG. 13) formed between the inner circumferential surface P22 and the second portion from the outside in the axial direction of the tubular packing body 301. This improves the waterproofing function of the waterproofing device 300.

<Cable configuration>
As shown in FIG. 10 , the cable C30 according to the third embodiment has a smaller wire diameter than the cable C10 (see FIG. 2 ), and three such cables C30 are present. A second seal body 302, which is deformed by the pressure of each cable C30 and has adhesive properties, is tightly attached to the core space G32 surrounded by the three cables C30. As shown in FIG. 11 , the three cables C30 are arranged so as to extend linearly parallel to the axial direction of the conduit P10. However, the three cables C30 may also be arranged in a twisted state (not shown) to form a helical wire. The second seal body 302 (see FIG. 10 ) is formed of water-absorbing and swelling rubber (e.g., highly adhesive butyl rubber in this embodiment).

<Installing the waterproof device>
As shown in Figures 10 to 13, the waterproofing device 300 according to the third embodiment described above has the same configuration as the waterproofing device 100, except for the shapes of the cable C30, the first seal body 301B, and the second seal body 302, and the presence or absence of a lip 311E on the packing body 301. Furthermore, the method of assembling the waterproofing device between the conduit opening and the cable is the same for the waterproofing devices 100 and 300 described above. Therefore, a detailed description of the method of assembling the waterproofing device 300 between the conduit opening P11 and the cable C30 will be omitted. However, because the waterproofing device 100 (see Figure 4) does not include the lip 311E (see Figure 4), the behavior of the lip 311E when assembling the waterproofing device 300 between the conduit opening P11 and the cable C30 will be described separately below.

As shown in Figure 11, an operator fits the waterproofing device 300 into the pipe opening P11. At this point, the lip 311E provided on the second part 311C from the axially outer side of the tube of the packing body 301 is compressed and comes into contact with the inner circumferential surface P22 of the pipe opening P11 (see Figure 11), as shown in Figure 13. This causes the lip 311E to press against the inner circumferential surface P22 of the pipe opening P11, making it difficult for the waterproofing device 300 to come off the pipe opening P11.

After fitting the waterproofing device 300 into the pipe opening P11, the worker fills the hollow chamber 320 with filler material F10 (see FIG. 10) through the injection valve 320B of the injection pipe 320A, as shown in FIG. 11. When the peripheral wall 310 expands, the second portion 311C warps outward in the axial direction of the tubular packing body 301, as shown in FIG. 13. This results in the formation of a minute gap G31 between the inner circumferential surface P22 and the second portion 311C. The packing body 301 then covers the minute gap G31 from the axial direction of the tubular packing body 301 with its lip 311E, thereby sealing the minute gap G31. This improves the waterproofing function of the waterproofing device 300 (see FIG. 11).

As a result, the waterproofing device 300 is installed at the pipe opening P11, as shown in Figure 11. When the cylindrical peripheral wall 310 of the packing body 301 expands, it presses against the joining surface 301D of the first seal body 301B and the opposing surface 321A of the edge portion 321, as shown in Figure 10. This allows the joining surface 301D and the opposing surface 321A to be tightly attached by the joining layer 303.

<Actions and Effects>
According to the waterproofing device 300 described above, in the fitted state, the lip 311E covers the second portion 311C from the outside in the axial direction of the tube of the packing body 301. This improves the function of the waterproofing device 300 as a waterproofing material.

By having the above-mentioned configurations, the waterproofing devices according to the above-mentioned embodiments can achieve both further improved waterproofing and reduced workability when fitting them into the pipe port P11.

<Other Embodiments>
The above-described embodiments have been used to describe the modes for carrying out the present invention. However, it will be apparent to those skilled in the art that various substitutions, modifications, and alterations are possible without departing from the scope of the present invention. In other words, the modes for carrying out the objects of the present invention may include all substitutions, modifications, and alterations that do not depart from the spirit and purpose of the claims appended hereto. For example, the following various modes can be implemented as modes for carrying out the present invention.

In the present disclosure, the specific configuration and shape of the sealing material are not limited to those described in the above-mentioned embodiments. That is, the sealing material may be an endless ring that surrounds the entire outer periphery of the first portion. The sealing material may also be a spiral or helical material that wraps around the entire outer periphery of the first portion. In such cases, the starting and ending ends of the sealing material may be located at different positions. Furthermore, the sealing material does not need to be arranged to surround the entire outer periphery of the first portion, and may be arranged so that there is a "gap" on the outer periphery where no sealing material is present.

As another aspect of each of the above-described embodiments, the waterproofing device may be configured so that only one second part is provided, and that second part is disposed on one side of the first part.

As another aspect of each of the above-described embodiments, the waterproof device may be configured with three second portions.

As another aspect of each of the above-described embodiments, in a waterproofing device, the end wall, edge, and barrel wall of the packing body may be made of the same type of rubber material. In such a case, if a hard rubber material is used for the barrel wall, this barrel wall will be thinner than the barrel wall of each embodiment, and will deform to the same extent as the barrel wall when the peripheral wall expands. This allows for only one type of material to be used for the packing body, thereby facilitating inventory management of the components that make up the packing body.

As another aspect of the first embodiment described above, the waterproofing device may be such that the first seal material provided in the first portion has an adhesive surface only on the inner surface of the seal. In this case, it is possible to reduce the risk of the outer surface of the seal getting caught on the inner surface of the power cable protection tube when fitting the waterproofing device.

As another aspect of the first embodiment described above, the waterproofing device 400 is a modified version of the first seal body 101B of the waterproofing device 100 according to the first embodiment. Therefore, for components that are common to the components of the first seal body 101B according to the first embodiment described above, reference numerals are assigned in which "300" is added to the reference numerals assigned to the components of the first seal body 101B according to the first embodiment, and detailed descriptions thereof will be omitted.

As shown in Figure 14, the waterproofing device 400 has a first seal body 401B that forms an arc-shaped seal surface 401C that adheres closely to the outer wall C11, which is the outer surface of a single cable C10, and is provided integrally on the inner circumferential portion 110A.

As another aspect of the second embodiment described above, in the waterproofing device, the second sealant does not need to have an adhesive surface. In such a case, the worker can attach the second sealant by fitting it to the first part. Furthermore, in a waterproofing device in which the second part is arranged to axially sandwich the first part, when the waterproofing device is being fitted or removed, the second sealant catches on the outward-extending second part, making it less likely to come off the first part.

As another aspect of the third embodiment described above, the waterproofing device 500 is a modified version of the first seal body 301B of the waterproofing device 300 according to the third embodiment. Therefore, for components that are common to the components of the first seal body 301B according to the third embodiment described above, reference numerals are assigned in which "200" is added to the reference numerals assigned to the components of the first seal body 301B according to the third embodiment, and detailed descriptions thereof will be omitted.

As shown in FIG. 15, the waterproofing device 500 is configured such that the angle 501F of the ridge 501E formed by the sealing surface 501C and the joining surface 501D of the first seal body 501B is less than 90°. Here, the pair of joining surfaces 501D forms a surface that extends from the contact surface C31A where the two cables C10 come into contact to the opposing surface 321A of the end edge portion 321. This allows the pair of joining surfaces 501D to appropriately exert pressure on each other when the peripheral wall 110 expands, even if the degree of deformation of the end edge portion 321 is smaller than that of the body wall portion 323 (see FIG. 13). This allows the first seal body 501B to appropriately deform under pressure caused by the expansion of the peripheral wall 110, as described below.

As another aspect of the third embodiment described above, the waterproofing device 600 is a modified version of the packing body 301 of the waterproofing device 300 according to the third embodiment. Therefore, for components that form part of the waterproofing device 600 and that are common to the components of the packing body 301 according to the third embodiment, a reference numeral with "300" added to the reference numeral assigned to each component of the packing body 301 according to the third embodiment is used to indicate the corresponding components, and detailed description thereof will be omitted.

As shown in Figure 16, when the waterproofing device 600 is fitted, at least one of the lips 611E arranged next to the second portion 611C may be arranged on one side of the first portion 611A, with the side facing the back of the conduit P10 (see Figure 11) being defined as one side.

100 Waterproof device 101 Packing body 101A Handle 101B First seal body 101C Sealing surface 101D Joining surface 102 Second seal body 103 Joining layer 110 Peripheral wall 110A Inner peripheral portion 111 Outer peripheral portion 111A First portion 111B Outer peripheral surface 111C Second portion 111D Groove 112 First seal material (sealing material)
112A Seal inner surface (adhesive surface)
112B Seal outer surface (adhesive surface)
120 Hollow chamber 120A Injection pipe 120B Injection valve 121 Edge portion 121A Opposing surface 121B Slit 122 End wall portion 123 Body wall portion 200 Waterproof device 201 Packing body 201A Handle 201B Adhesive layer 201C Sealing surface 201D Joining surface 203 Joining layer 210 Peripheral wall 210A Inner peripheral portion 211 Outer peripheral portion 211A First portion 211B Outer peripheral surface 211C Second portion 211D Groove 212 Second sealing material (sealing material)
212A Seal inner surface (adhesive surface)
212B Seal outer surface 220 Hollow chamber 220A Injection pipe 220B Injection valve 221 Edge portion 221A Opposing surface 221B Slit 222 End wall portion 223 Body wall portion 300 Waterproofing device 301 Packing body 301A Handle 301B First seal body 301C Sealing surface 301D Joining surface 301E Ridge line 301F Corner 302 Second seal body 303 Joining layer 310 Peripheral wall 310A Inner peripheral portion 311 Outer peripheral portion 311A First portion 311B Outer peripheral surface 311C Second portion 311D Groove 311E Lip 312 First seal material (sealing material)
312A Seal inner surface 312B Seal outer surface 320 Hollow chamber 320A Injection pipe 320B Injection valve 321 Edge portion 321A Opposing surface 321B Slit 322 End wall portion 323 Body wall portion 400 Waterproof device 401 Packing body 401B First seal body 401C Seal surface 401D Joint surface 500 Waterproof device 501 Packing body 501B First seal body 501C Seal surface 501D Joint surface 501E Ridge line 501F Corner 600 Waterproof device 601 Packing body 610 Peripheral wall 610A Inner peripheral portion 611 Outer peripheral portion 611A First portion 611B Outer peripheral surface 611C Second portion 611D Groove 611E Lip 612 First seal material (sealing material)
612A Seal inner surface 612B Seal outer surface 620 Hollow chamber C10 Cable C11 Outer peripheral wall C11A Contact surface C20 Cable C21 Outer peripheral wall C30 Cable C31 Outer peripheral wall C31A Contact surface F10 Filler G10 Gap G11 Minute gap G12 Core space portion G20 Gap G21 Minute gap G30 Gap G31 Minute gap G32 Core space portion P10 Pipe P11 Pipe opening P20 Power cable protection tube P21 End P22 Inner peripheral surface

Claims (7)

A waterproofing device that can realize a fitted state in a conduit opening of a conduit into which a cable is inserted,
a packing body made of an elastic body having a cylindrical shape and sized to be fitted into the gap between the inner circumferential surface of the conduit opening and the cable;
a slit that divides the peripheral wall of the tubular packing body in the circumferential direction into two opposing edge portions, thereby allowing the cable to be inserted into the tubular packing body through the gap between the edge portions;
a hollow space having a hollow structure provided inside the peripheral wall, the hollow space being filled with a filler material to expand the peripheral wall;
Equipped with
The peripheral wall has an outer peripheral portion on the outer periphery of the cylinder of the packing body,
a first portion provided in a state of extending in the circumferential direction and a second portion provided in a state of extending along the first portion and projecting outward more than the first portion are provided in a state of being aligned in an axial direction of the cylinder of the packing body,
a seal material is disposed along an outer peripheral surface of the first portion, the outer peripheral surface being a surface on the outer peripheral side of the first portion; the seal material has an inner seal surface facing the outer peripheral surface and an outer seal surface being a surface opposite to the inner seal surface ;
The sealing material is an elastic body that can be elastically compressed in a thickness direction,
In a natural state where no external force is applied, the seal outer surface protrudes outward beyond the second portion,
In the fitted state, the sealing material is in the compressed state and contacts the inner circumferential surface of the pipe opening . A waterproofing device that can realize a fitted state in a conduit opening of a conduit into which a cable is inserted,
a packing body made of an elastic body having a cylindrical shape and sized to be fitted into the gap between the inner circumferential surface of the conduit opening and the cable;
a slit that divides the peripheral wall of the tubular packing body in the circumferential direction into two opposing edge portions, thereby allowing the cable to be inserted into the tubular packing body through the gap between the edge portions;
a hollow space having a hollow structure provided inside the peripheral wall, the hollow space being filled with a filler material to expand the peripheral wall;
Equipped with
The peripheral wall has an outer peripheral portion on the outer periphery of the cylinder of the packing body,
a first portion provided in a state of extending in the circumferential direction and a second portion provided in a state of extending along the first portion and projecting outward more than the first portion are provided in a state of being aligned in an axial direction of the cylinder of the packing body,
a seal material is disposed along an outer peripheral surface of the first portion, the outer peripheral surface being a surface on the outer peripheral side of the first portion; the seal material has an inner seal surface facing the outer peripheral surface and an outer seal surface being a surface opposite to the inner seal surface;
A waterproofing device in which a lip extends along the second portion and protrudes outward from the second portion, and is arranged in a line so as to cover the second portion from the outside in the axial direction of the tube of the packing body. A waterproofing device that can realize a fitted state in a conduit opening of a conduit into which a cable is inserted,
a packing body made of an elastic body having a cylindrical shape and sized to be fitted into the gap between the inner circumferential surface of the conduit opening and the cable;
a slit that divides the peripheral wall of the tubular packing body in the circumferential direction into two opposing edge portions, thereby allowing the cable to be inserted into the tubular packing body through the gap between the edge portions;
a hollow space having a hollow structure provided inside the peripheral wall, the hollow space being filled with a filler material to expand the peripheral wall;
Equipped with
The peripheral wall has an outer peripheral portion on the outer periphery of the cylinder of the packing body,
a first portion provided in a state of extending in the circumferential direction and a second portion provided in a state of extending along the first portion and projecting outward more than the first portion are provided in a state of being aligned in an axial direction of the cylinder of the packing body,
a seal material is disposed along an outer peripheral surface of the first portion, the outer peripheral surface being a surface on the outer peripheral side of the first portion; the seal material has an inner seal surface facing the outer peripheral surface and an outer seal surface being a surface opposite to the inner seal surface;
The waterproof device, wherein the sealing material is a double-sided seal having adhesive surfaces on both the inner seal surface and the outer seal surface. The waterproof device according to any one of claims 1 to 3 ,
The waterproof device, wherein the second portion is provided in a state of protruding outward from the seal outer surface. The waterproofing device according to any one of claims 1 to 4 ,
A waterproof device, wherein the first portion, the second portion, and the sealing material are provided so as to surround the entire periphery of the outer periphery portion. The waterproofing device according to claim 5 ,
The waterproof device is such that the sealing material is wrapped around the entire outer periphery, with the starting end and the ending end coinciding with each other. The waterproofing device according to any one of claims 1 to 6 ,
The waterproofing device, wherein the second portion is arranged to sandwich the first portion in the axial direction, thereby forming a groove together with the first portion.