Waterproof device and production method of waterproof device

Abstract

To provide a waterproof device capable of reducing the man hours in a production of the waterproof device, and provide a production method of the waterproof device.SOLUTION: A waterproof device 100 that is sealed by valving a duct line port P11 of a duct line P10 into which an underground cable C10 is inserted, comprises a packing 101 that is inserted into the duct line port P11 in a winding state that an outer periphery surface C11 of the underground cable C10 is wound, and that is expanded to a radial direction of the duct line port P11 by filling a filling material F10 from a filling port 133. The packing 101 is an insert molding component having: a main body 110 formed by an elastic body 110E; and a core 135 inserted into the main body 110. The filling port 133 communicates with a boundary part between the main body 110 and the core 135.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] SUMMARY The present disclosure relates to waterproof devices and methods of producing waterproof devices. [Background technology]

[0002] Conventionally, as a structure for laying cables such as power transmission cables and communication cables underground, a structure in which a hollow conduit connects multiple handhole chambers and the cables are passed through this conduit is known. Here, the conduit may be damaged when laying underground or during other underground construction work, and cracks that occur at that time may become an entry point for groundwater to enter the conduit. In addition, a gap between the end bell, which is the opening of the joint that connects the conduits, and the conduit may become an entry point for groundwater to enter the conduit. In these cases, there is a risk that the infiltrating water will enter the handhole chamber through the conduit opening. To prevent this, a waterproofing device may be attached to the conduit opening facing the handhole chamber in the conduit.

[0003] For example, Patent Document 1 discloses a technique for fitting a tubular waterproofing device into the gap between a cable and the inner peripheral surface of a pipe opening in order to seal the pipe opening. Here, the waterproofing device includes a packing body having a slit that can be assembled from the outer peripheral side of the cable. The packing body has a hollow chamber inside. When the hollow chamber is filled with a filler, the peripheral wall of the packing body expands in the radial direction, thereby sealing the pipe opening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-035421 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology disclosed in Patent Document 1, it is necessary to bond together multiple types of rubber materials to form the packing body in which the hollow chamber is provided. In response to this, there has been a need to reduce the number of steps in the production of waterproof devices by integrally molding the packing for the waterproof device.

[0006] The present disclosure provides a waterproof device and a method for producing a waterproof device that can reduce the number of steps in producing the waterproof device. [Means for solving the problem]

[0007] First, the waterproofing device according to the first disclosure is a waterproofing device that plugs and seals the conduit opening of a conduit into which an underground cable is inserted, and is provided with a gasket that is inserted into the conduit opening in a wrapped state surrounding the outer circumferential surface of the underground cable and expands radially of the conduit opening as a filler is filled in through the filling port, the gasket being an insert-molded product that includes a main body made of an elastic body and a core inserted into the main body, and the filling port is connected to the boundary between the main body and the core.

[0008] According to the waterproofing device of the first disclosure, the packing can expand by filling the boundary between the body and the core with a filler. This makes it possible to provide a waterproofing device that does not need to have a hollow structure in the packing during production, thereby reducing the number of steps required.

[0009] Here, the waterproofing device according to the first disclosure may be a waterproofing device according to a second disclosure described below. In the waterproofing device according to the second disclosure, a gap into which the filler enters is present at the boundary portion.

[0010] According to the waterproofing device of the second disclosure, the pressure generated when the filler enters the gap at the boundary makes it easier for the main body and the core to peel off, thereby making it easier to fill the gap between the main body and the core with the filler.

[0011] Here, the waterproofing device according to the first or second disclosure may be a waterproofing device according to the third disclosure, which will be described later. In the waterproofing device according to the third disclosure, the core is a plate that is chemically stable against the filler and has the property of flexing flexibly against an external force.

[0012] According to the waterproofing device of the third disclosure, the core is less likely to be chemically altered by the filler, and therefore the waterproofing device can be used for a long period of time while preventing deterioration of the core and the filler.

[0013] Here, the waterproofing device according to the third disclosure may be the waterproofing device according to the fourth disclosure described below. In the waterproofing device according to the fourth disclosure, the main body has a back surface facing the underground cable in the wrapped state and a front surface facing the opposite side to the underground cable in the wrapped state, and the plate is arranged such that one plate surface extends along the front surface and the other plate surface extends along the back surface.

[0014] According to the waterproofing device of the fourth disclosure, the packing can be easily brought into a wrapped state by bending the core inserted into the main body.

[0015] Here, the waterproofing device according to the first or second disclosure may be a waterproofing device according to the fifth disclosure, which will be described later. In the waterproofing device according to the fifth disclosure, the packing includes a support inserted into the main body, and the support engages with the core to regulate the position of the core relative to the main body.

[0016] According to the waterproofing device of the fifth disclosure, the core is supported on the main body via the support body, and therefore is less likely to shift position relative to the main body.

[0017] Here, the waterproofing device according to the second disclosure may be a waterproofing device according to the sixth disclosure described below. In the waterproofing device according to the sixth disclosure, the main body has a back surface facing the underground cable in the wound state and a front surface facing the opposite side to the underground cable in the wound state, the gap includes an outer gap on the front surface side relative to the core and an inner gap on the back surface side relative to the core, and the filling port is in communication with both the outer gap and the inner gap.

[0018] According to the waterproofing device of the sixth disclosure, the filler is filled in the outer gap, which is on the radially outer side of the pipe opening relative to the core, and the inner gap, which is on the radially inner side of the pipe opening relative to the core. Then, the packing expands on both sides of the pipe opening in the radial direction relative to the core. This allows the main body made of an elastic body to deform to its limit on both the front surface side and the back surface side. Therefore, according to the waterproofing device of the sixth disclosure, the maximum amount of radial expansion of the packing as a whole can be increased.

[0019] Next, a seventh disclosure is a method for producing a waterproofing device according to the first or second disclosure, comprising a step of forming the gasket by insert molding the core with the elastomer.

[0020] According to the method for producing a waterproof device according to the seventh disclosure, the packing can be formed by insert molding the core with an elastic body, thereby providing a method for producing a waterproof device that can reduce the number of steps required for producing the waterproof device. Effect of the Invention

[0021] By virtue of having the above-described configurations, the present disclosure can provide a waterproof device and a method for producing a waterproof device that can reduce the number of steps in producing the waterproof device. [Brief description of the drawings]

[0022] [Figure 1]1 is a perspective view of a waterproof device 100 according to a first embodiment. [Diagram 2] FIG. 2 is a front view of the waterproof device 100 of FIG. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Diagram 5] FIG. 4 is an enlarged view of part V in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 2 is an explanatory diagram for explaining a step of forming a packing 101. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The waterproofing device 100 according to the first embodiment of the present disclosure plugs and seals a conduit opening P11 of a conduit P10 into which three underground cables C10 are inserted in a bundled state, as shown in Fig. 1. Hereinafter, the details of the waterproofing device 100 according to the present disclosure will be described together with the conduit P10 and the underground cables C10 with reference to the drawings.

[0024] <Pipeline configuration> The conduit P10 is an underground cable protection pipe P20 used when an underground cable C10 such as a power transmission cable or a communication cable is laid underground. Here, the underground cable protection pipe P20 has a hollow cylindrical shape, and both ends P21 in the axial direction of the tube are connected to respective handhole chambers (not shown). The tube shape of the conduit P10 is such that an inner peripheral surface P12 is in close contact with an outer peripheral portion 111 of a packing 101 provided in the waterproofing device 100. Note that the conduit P10 is made of a material for underground laying (in this embodiment, for example, plastic such as FRP).

[0025] <Cable configuration> As shown in Fig. 2 and Fig. 6, there are three underground cables C10. In the core space portion G12 surrounded by the three underground cables C10, a second seal body 102, which is pressed and deformed by each of the three underground cables C10 and has adhesiveness, is in close contact with the core space portion G12. Here, as shown in Fig. 1 and Fig. 3, each of the three underground cables C10 is arranged so as to extend linearly parallel to the axial direction (see Fig. 3) in the pipeline P10. However, the three underground cables C10 may be arranged in a state in which they are twisted with each other to form a helical wire (not shown). In this embodiment, the second seal body 102 is formed of water-absorbing swelling rubber (for example, butyl rubber having high adhesiveness).

[0026] <Waterproof device configuration> 1, the waterproofing device 100 functions as a waterproofing material that seals a gap G10 between an inner peripheral surface P12 of a conduit opening P11 on the other side (see FIG. 3) of the conduit P10 and the outer peripheral surfaces C11 of the three underground cables C10. Here, the other side refers to the near side of the conduit P10 in the axial direction (see FIG. 3).

[0027] The waterproofing device 100 includes a packing 101 and a first seal body 101B. Here, the packing 101 is a band-shaped member that is inserted into the conduit opening P11 in a state where it surrounds the outer circumferential surfaces C11 of the three underground cables C10. The packing 101 has a filling port 133 for the filler F10 (see FIG. 3) protruding from one side surface of the band. In this embodiment, the packing 101 is inserted into the conduit opening P11 with the filling port 133 facing the front side (see FIG. 3). When the filler F10 (see FIG. 3) is filled from the filling port 133 in this state, the packing 101 expands in the radial direction of the conduit opening P11. In addition, the first seal body 101B seals between the inner circumferential portion 112 of the packing 101 and each of the three underground cables C10, as shown in FIG. 2 and FIG. 6. The packing 101 and the first seal body 101B will be described below.

[0028] <Packing composition> As shown in FIG. 1, the packing 101 is an insert molded product in which a core 135, a filling port 133, a handle 131, and four supports 132 are integrally molded with a main body 110 made of an elastic body 110E. Here, the core 135 is an insert that is entirely embedded in the main body 110. At a boundary portion 120A between the core 135 and the main body 110, a gap 120B into which the filler F10 enters is present, as shown in FIG. 5. The filler F10 having fluidity is injected into the filling port 133 toward the boundary portion 120A. At this time, the injected filler F10 expands the gap 120B by its pressure to form a filling space 120, and is filled into the filling space 120. As shown in FIG. 1, the handle 131 is gripped together with the filling port 133 with a substantially uniform gripping force when the waterproofing device 100 is fitted to and removed from the pipe opening P11. 1, the four supports 132 engage with the core 135 to regulate the position of the core 135 relative to the main body 110. The main body 110, the core 135, the filling port 133, the filler F10, the handle 131, and the supports 132 will be described below.

[0029] <Main body configuration> 2 and 6, the main body 110 has a tubular shape (e.g., a cylindrical shape) surrounding the outer circumferential surfaces C11 of the three underground cables C10 in the above-mentioned wrapped state. Also, as shown in FIG. 3, the main body 110 is fitted into the conduit opening P11 with the axial direction of the tube coinciding with the axial direction of the conduit P10.

[0030] Here, the two end edges 121 of the band of the main body 110 face each other in the above-mentioned wound state, as shown in Figures 2 and 6. As a result, a slit 121B is provided between the two end edges 121, which allows the three underground cables C10 to be inserted into the tube of the main body 110.

[0031] The opposing surfaces 121A of the two opposing end edges 121 are provided with a bonding layer 103 that is pressed into a tightly adhered state. A seal material 111E (see FIG. 1) having flexibility and adhesion is disposed on the outer peripheral side of the end edges 121. Therefore, when the wrapped packing 101 expands in the circumferential direction between the inner peripheral surface P12 at the pipe opening P11 (see FIG. 3) of the pipe P10 and the first seal body 101B, the bonding layer 103 is pressed into a tightly adhered state. Similarly, the seal material 111E is also pressed into a tightly adhered state by being pressed against the inner peripheral surface P12 at the pipe opening P11 of the pipe P10. Note that a water-absorbing swelling rubber (for example, butyl rubber having adhesiveness that is pressed into a tightly adhered state in this embodiment) is used for the adhesive surface of the bonding layer 103. Similarly, for the seal material 111E, for example, butyl rubber having adhesiveness that is pressed into a tightly adhered state is used.

[0032] Moreover, elastic body 110E in main body 110 is configured to have releasability with respect to core 135. That is, elastic body 110E is made of a material that is more easily deformed than core 135 and is more easily peeled off from core 135 when subjected to injection pressure from filling port 133 (see FIG. 2). This makes it easier for filler F10 to fill gap 120B (see FIG. 6) between peeled elastic body 110E of main body 110 and core 135. In this embodiment, for example, chloroprene rubber with a hardness of about 55° is used for elastic body 110E.

[0033] 6, the filling space 120 is a space formed by the elastic body 110E receiving injection pressure from the filling port 133 (see FIG. 2) peeling off from the core 135 and deforming. Then, the filling material F10 presses the elastic body 110E, causing the packing 101 to expand in the radial and circumferential directions of the pipe port P11.

[0034] 4 and 5, the cylindrical main body 110 is provided with four grooves 111D formed so as to surround the entire circumference of the outer peripheral portion 111 on the outer periphery side, and arranged at equal intervals in the axial direction of the cylinder of the main body 110. Therefore, when the packing 101 in the wrapped state is filled with the filler F10 from the filling port 133 (see FIG. 4), the four grooves 111D are deformed so as to face the inner peripheral surface P12 side of the pipe port P11.

[0035] <Core composition> Core 135 is provided so as to be surrounded within main body 110. Therefore, when a force in a direction away from core 135 is applied to elastic body 110E of main body 110 at boundary portion 120A between main body 110 and core 135, packing 101 expands.

[0036] In this embodiment, the core 135 is a metal plate (for example, a stainless steel rectangular plate having a predetermined thickness) that is chemically stable with respect to the filler F10 and has the property of "flexibly bending" against an external force (i.e., "flexibility"). This plate has releasability with respect to the elastic body 110E.

[0037] Moreover, the core 135, which is a plate, is disposed in the cylindrical main body 110 with one plate surface extending along the front surface 110C and the other plate surface extending along the back surface 110D, as shown in Fig. 4 to Fig. 6. Here, the back surface 110D is the surface of the main body 110 that faces the three underground cables C10 in the wound state, as shown in Fig. 6. Similarly, the front surface 110C is the surface of the main body 110 that faces the opposite side to the three underground cables C10 in the wound state.

[0038] <Filling port configuration> As shown in Fig. 4, the filling port 133 is in communication with the boundary portion 120A between the main body 110 and the core 135. In this embodiment, the filling port 133 is an injection valve, a part of which is inserted into the main body 110 and which communicates from the outside of the packing 101 with the portion corresponding to the boundary portion 120A between the main body 110 and the core 135. This injection valve protrudes from the main body 110 to the front side (the side that becomes the other side of the pipeline P10 when the packing 101 is inserted into the pipeline port P11; see Fig. 3).

[0039] In this embodiment, when viewed from the front side (see FIG. 2), filling port 133 is provided at a position spaced approximately 130° clockwise from slit 121B in the circumferential direction of the tube of main body 110. In addition, a valve cap 133B for protecting filling port 133 is attached to the tip of filling port 133.

[0040] As shown in Fig. 4 and Fig. 5, the gap 120B includes an outer gap 120C on the side of the front surface 110C relative to the core 135, and an inner gap 120D on the side of the back surface 110D relative to the core 135. The filling port 133 (see Fig. 4) is connected to both the outer gap 120C and the inner gap 120D. Therefore, the filling material F10 is filled in the outer gap 120C on the radially outer side of the pipe port P11 relative to the core 135, and the inner gap 120D on the radially inner side of the pipe port P11 relative to the core 135. Then, the packing 101 expands on both sides of the radial direction of the pipe port P11 relative to the core 135.

[0041] <Filling material composition> 4, the filler F10 is filled into the gap 120B of the boundary portion 120A through the filling port 133. In this embodiment, the filler F10 is a material having fluidity (for example, silicone liquid).

[0042] <Handle configuration> When viewed from the front side (see FIG. 2), the handle 131 is provided at a position approximately 130° counterclockwise away from the slit 121B in the circumferential direction of the cylinder of the main body 110. The handle 131 protrudes from the main body 110 on the same side as the filling port 133 (i.e., the front side; see FIG. 3). In this embodiment, the handle 131 is a metal cylinder whose outer diameter is approximately the same as that of the filling port 133. As shown in FIG. 1, the handle 131 is disposed so that its protruding length from the main body 110 is approximately the same as the protruding length of the filling port 133 from the main body 110. The handle 131 is configured such that a base portion 131A embedded in the main body 110 bites into an edge surface 135A of the plate of the core 135.

[0043] <Support Structure> The four supports 132 are arranged in pairs, and each pair sandwiches the plate of the core 135 from both sides in the width direction (see FIG. 5). In this embodiment, the pairs of supports 132 are provided on the opposing surfaces 121A (see FIG. 2) of the main body 110 at positions spaced apart by approximately 20° in the circumferential direction of the cylinder of the main body 110 (see FIG. 2). As shown in FIG. 5, each support 132 has a configuration in which a root portion 132A embedded in the main body 110 bites into an edge surface 135A of the core 135. With this configuration, the four supports 132 engage with the core 135 to regulate the position of the core 135 relative to the main body 110. In this embodiment, the support 132 is a metal cylinder.

[0044] <Configuration of first seal body> 2 and 6, the first seal body 101B is attached so that the inner peripheral portion 112 of the packing 101 and each of the three underground cables C10 form a three-star pattern on a circle. The first seal body 101B has an arc-shaped seal surface 101C that is in close contact with the outer peripheral surface C11 of the three underground cables C10, and is provided integrally on the inner peripheral portion 112. The first seal body 101B further has a pair of joint surfaces 101D that are surfaces that face each other by dividing the first seal body 101B in the circumferential direction, and a joint layer 103 that joins these surfaces together. Here, the pair of joint surfaces 101D constitute each surface that extends from the contact surface C11A where the two underground cables C10 contact each other to the end edge portion 121.

[0045] The first seal body 101B is made of liquid rubber (for example, polybutadiene rubber having flexibility and adhesiveness in this embodiment) that can adhere to cables of various shapes and can be easily changed in shape. The first seal body 101B is appropriately deformed by receiving pressure due to the expansion of the main body 110.

[0046] <Packing formation> When forming the packing 101 of the waterproofing device 100 according to the first embodiment described above, as shown in FIG. 7, an operator (not shown) insert-moldes a core 135 by a method including the following steps.

[0047] First, an operator performs an attachment step of attaching the filling port 133, the handle 131, and the four supports 132 to the core 135, which is a plate.

[0048] Next, the worker performs an arrangement process in which the core 135 (hereinafter also referred to as "assembly") to which the filling port 133, the handle 131, and the respective supports 132 are attached is arranged in a mold (not shown). Here, the mold used has a plate-shaped cavity. In the arrangement process, the assembly is arranged so that the entire core 135 is housed in the cavity of the mold.

[0049] Next, the worker performs the mold clamping process.

[0050] Next, the worker performs an injection process in which the raw material of the elastic body 110E is injected and filled into the cavity of the clamped mold.

[0051] Next, the worker heats the mold to carry out a vulcanization process for promoting a vulcanization reaction in the raw material. Through this vulcanization process, the raw material becomes elastic body 110E in the cavity of the mold, and packing 101 is formed.

[0052] Next, the worker performs a cooling step to cool the mold to a predetermined temperature.

[0053] Next, the worker performs an ejection step in which the die is opened and the packing 101 is ejected.

[0054] In this manner, the packing 101 is produced in which the core 135 is insert-molded with the elastic body 110E. This packing 101 is then bent so that the main body 110 thereof becomes the above-mentioned cylindrical shape.

[0055] <Installation of waterproof device> When assembling the waterproofing device 100 according to the first embodiment described above between the pipe opening P11 and the three underground cables C10, an operator (not shown) performs the assembling in the following manner.

[0056] First, the worker inserts the second seal body 102 into the core space portion G12 of the three underground cables C10 as shown in Fig. 2. This brings each of the three underground cables C10 and the second seal body 102 into close contact with each other.

[0057] Next, the worker widens the slits 121B of the packing 101 and inserts the three underground cables C10 with the second seal body 102 in close contact into the cylinder of the packing 101, thereby wrapping the packing 101. At this time, the three underground cables C10 are fitted into the seal surface 101C of the first seal body 101B that is integrated with the packing 101. Then, the three underground cables C10 and the packing 101 are in close contact with each other.

[0058] Next, the worker fits the waterproofing device 100 into the pipe opening P11 as shown in Figures 1 and 3. In this operation, the worker holds the filling port 133 and the handle 131 of the waterproofing device 100 with a substantially uniform gripping force, and then fits the waterproofing device 100 into the pipe opening P11. Through this operation, the core 135 is supported by the main body 110 via the filling port 133 and the handle 131, and is less likely to shift position relative to the main body 110.

[0059] Next, as shown in FIG. 3, the worker removes the valve cap 133B of the filling port 133 and fills the filling material F10. Here, the filling material F10 of the filling port 133 enters the outer gap 120C and the inner gap 120D of the boundary portion 120A, and pressure is applied so that the elastic body 110E of the main body 110 moves away from the core 135. Then, the packing 101 expands on both sides of the radial direction of the pipe port P11 relative to the core 135. As a result, the main body 110 made of the elastic body 110E is deformed to the limit on each of the front surface 110C side and the back surface 110D side. At this time, the first seal body 101B is appropriately deformed by receiving the pressure due to the expansion of the packing 101. Then, the pair of joint surfaces 101D of the first seal body 101B is appropriately pressured and tightly adheres to each other. Furthermore, the packing 101 is deformed so that the four grooves 111D are directed toward the inner circumferential surface P12 of the pipe port P11. The sealant 111E is brought into close contact with the inner circumferential surface P12 of the pipe port P11 of the pipe P10 (see FIG. 3).

[0060] When filling of the filler F10 is complete, the worker reattaches the valve cap 133B to the filling port 133. This completes the installation of the waterproofing device 100 to the pipe port P11. When the packing 101 expands, the joint surface 101D of the first seal body 101B and the opposing surface 121A of the edge portion 121 are pressed against the main body 110, as shown in Figs. 2 and 6.

[0061] <Actions and Effects> According to the above-mentioned waterproofing device 100, the packing 101 can expand by filling the filler F10 into the boundary portion 120A between the main body 110 and the core 135. This makes it possible to provide the waterproofing device 100 in which it is not necessary to provide a hollow structure in the packing 101 during production of the waterproofing device 100, thereby reducing the number of steps required.

[0062] According to the above-described waterproofing device 100, the packing 101 and the first seal body 101B can plug and seal between the three underground cables C10 and the inner circumferential surface P12 of the pipe opening P11.

[0063] According to the above-mentioned waterproofing device 100, the pressure generated when the filler F10 enters the gap 120B of the boundary portion 120A makes it easier for the main body 110 and the core 135 to peel off from each other, thereby making it easier to fill the gap between the main body 110 and the core 135 with the filler F10.

[0064] According to the above-described waterproofing device 100, the core 135 is not easily chemically altered by the filler F10. Therefore, deterioration of the core 135 and the filler F10 is suppressed, and the waterproofing device 100 can be used for a long period of time.

[0065] According to the waterproofing device 100 described above, the packing 101 can be easily brought into a wrapped state by bending the core 135 inserted into the main body 110.

[0066] According to the above-described waterproofing device 100, by gripping the handle 131 and the filling port 133 with a substantially uniform gripping force, the waterproofing device 100 can be easily fitted to and removed from the pipe port P11.

[0067] According to the above-described waterproofing device 100, the handle 131 engages with the core 135 to regulate the position of the core 135 relative to the main body 110. In this way, the core 135 is supported by the main body 110 via the handle 131, and is therefore less likely to shift position relative to the main body 110. As a result, when the waterproofing device 100 is fitted into the pipe opening P11, the expansion point of the packing 101 can be regulated to a predetermined position.

[0068] According to the above-described waterproofing device 100, since the core 135 is supported by the main body 110 via the support 132, the core 135 is less likely to become misaligned with respect to the main body 110.

[0069] According to the above-mentioned waterproofing device 100, the filling port 133 can form the filling space 120 by injecting the filler F10 into the boundary portion 120A between the main body 110 and the core 135, and fill this filling space 120 with the filler F10.

[0070] According to the above-described waterproofing device 100, the filler F10 (see FIG. 4) can be injected from the outside of the packing 101 to expand the packing 101 in the radial direction of the pipe opening P11.

[0071] According to the above-mentioned waterproofing device 100, the filler F10 is filled in the outer gap 120C, which is on the radially outer side of the pipe opening P11 relative to the core 135, and the inner gap 120D, which is on the radially inner side of the pipe opening P11 relative to the core 135. Then, the packing 101 expands on both sides of the pipe opening P11 in the radial direction relative to the core 135. This allows the main body 110 made of the elastic body 110E to deform to the limit on both the front surface 110C side and the back surface 110D side. Therefore, according to the above-mentioned waterproofing device 100, the maximum amount of the above-mentioned radial expansion can be increased in the entire packing 101.

[0072] According to the above-mentioned waterproofing device 100, the gasket 101 in the wrapped state can disperse stress bias in the axial direction of the pipe opening P11 by deforming the four grooves 111D of the outer peripheral portion 111 toward the inner peripheral surface P12 of the pipe opening P11.

[0073] According to the above-described waterproofing device 100, the first seal body 101B can closely contact and seal between the inner circumferential portion 112 of the packing 101 and each of the three underground cables C10.

[0074] According to the above-described waterproofing device 100, when the main body 110 expands, the pair of joint surfaces 101D can receive an appropriate pressure even if the degree of deformation of the edge portion 121 in the circumferential direction of the wrapped packing 101 is small.

[0075] According to the above-mentioned waterproofing device 100, the gasket 101 expanded radially presses against the inner surface P12 of the pipe opening P11 and the first seal body 101B to bring them into close contact, and the gasket 101 expanded circumferentially presses against the opposing surface 121A of the edge portion 121 to bring them into close contact.

[0076] According to the above-described waterproofing device 100, the bonding surface 101D and the opposing surface 121A can be brought into close contact with each other by the bonding layer 103.

[0077] According to the above-described waterproofing device 100, the packing 101 can be formed by insert molding the core 135 with the elastic body 110E. This provides a method for producing the waterproofing device 100 that can reduce the number of steps required for producing the waterproofing device 100.

[0078] By virtue of the above-described configurations, the present disclosure can provide the waterproof device 100 and a method for producing the waterproof device 100, which can reduce the number of steps in the production of the waterproof device 100.

[0079] <Other embodiments> The above describes the embodiments of the present invention. However, it is clear to those skilled in the art that various substitutions, modifications, and changes are possible without departing from the purpose of the present invention. In other words, the embodiment of the present invention may include all substitutions, modifications, and changes that do not deviate from the spirit and purpose of the claims attached to this specification. For example, the following various embodiments can be implemented as the embodiment of the present invention.

[0080] In the waterproofing device according to the present disclosure, the surface of the core may be coated with a coating that has releasability with respect to the elastic body of the main body. In such a case, the range of materials that can be selected for the core can be expanded.

[0081] In the waterproofing device according to the present disclosure, the packing may be an insert molded product including only a main body, a core, a filling port, and two supports inserted into the main body. In this case, the core is supported by the main body via the filling port and the two supports. [Explanation of symbols]

[0082] 100 waterproofing device 101 Gasket 101B First seal body 101C Sealing surface 101D Joint surface 102 Second seal body 103 Bonding layer 110 Main unit 110C Front side 110D Back side 110E Elastic body 111 Outer area 111D Groove 111E Sealing material 112 Inner circumference 120 filling space 120A Boundary 120B Gap 120C Outer clearance 120D Inner side gap 121 Edge 121A Opposite surface 121B Slit 131 Toride 131A Base part 132 Support 132A Base part 133 Filling port 133B Valve Cap 135 Core 135A Edge C10 Underground Cable C11 Outer surface C11A contact surface F10 Filler G10 void G12 Core space section P10 Pipeline P11 Pipe port P12 Inner surface P20 Underground cable protection pipe P21 end P22 Inner surface

Claims

1. A waterproofing device that plugs and seals the opening of a conduit into which an underground cable is inserted, a packing that is inserted into the conduit opening in a wrapped state surrounding an outer circumferential surface of the underground cable and expands in a radial direction of the conduit opening when a filler is filled into the packing through a filling port; The packing is an insert-molded product including a main body made of an elastic body and a core inserted into the main body, The filling port is in communication with the boundary between the main body and the core. Waterproofing device.

2. 2. The waterproofing device according to claim 1, A gap into which the filler material enters is present at the boundary portion. Waterproofing device.

3. The waterproof device according to claim 1 or 2, The core is a plate that is chemically stable against the filler and has the property of flexibly bending against an external force. Waterproofing device.

4. 4. The waterproofing device according to claim 3, The body comprises: a back surface facing the underground cable in the wrapped state; a front surface facing away from the underground cable in the wrapped state; The plate is disposed in such a state that one plate surface extends along the front surface and the other plate surface extends along the back surface. Waterproofing device.

5. The waterproof device according to claim 1 or 2, The packing includes a support inserted into the body, The support engages with the core to regulate the position of the core relative to the body. Waterproofing device.

6. 3. The waterproofing device according to claim 2, The body comprises: a back surface facing the underground cable in the wrapped state; a front surface facing away from the underground cable in the wrapped state; The gap is an outer gap on the front surface side of the core; an inner gap on the back surface side of the core, The filling port is in communication with both the outer gap and the inner gap. Waterproofing device.

7. A method for producing a waterproofing device according to claim 1 or 2, comprising the steps of: forming the packing by insert molding the core with the elastic body; A method for producing waterproofing equipment.

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