JP5371543B2 - Water stop device and jig used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing apparatus for sealing between a communication cable or a power cable and a protective tube for housing and holding the cable, which can seal cables regardless of the number of cables. <P>SOLUTION: The sealing apparatus 31 includes a water expanding sheet 41 wound around a cable 11, and a packing 51 attached to the cable 11 from above the water expanding sheet 41 and having an inner circumferential surface in contact with the water expanding sheet 41 and an outer circumferential surface in contact with the protective tube. Water expanding layers 52 and 53 which expand absorbing water are integrally formed on the inner and outer circumferential surfaces of the packing 51. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a water stop device that stops water between a communication cable or a power cable and a protective tube that accommodates and holds the cable, and more specifically, a water stop device that can stop water regardless of the number of cables. About.

  As a water stop apparatus, there exists a thing as disclosed by the following patent document 1. FIG. This is a water stop cock formed in a cylindrical shape, and is used by inserting the water stop cock into the outer peripheral surface of the cable and then inserting it into the end of the protective tube. The water stop cock is formed of a water-swellable rubber composition, and a mat made of the water-swellable fiber composition is provided on a part of the inner peripheral surface and the outer peripheral surface. That is, after fitting a water stopcock to a protective tube, the water stopcock absorbs water and expands to stop water between the protective tube and the cable.

Japanese Patent No. 2793234

  According to the water faucet of Patent Document 1, water is stopped when the entire water faucet expands, but the portion other than the water expandable fiber composition of the water faucet, that is, a main body made of water expandable rubber It takes a long time such as one to several days for the part to fully expand. For this reason, sufficient water stoppage cannot be obtained until it fully expands.

  Moreover, since the diameter of the inner periphery of the water stopcock corresponds to the thickness of the cable to be accommodated, multiple types of water stopcocks corresponding to the number and thickness of the cables to be accommodated are necessary.

  Accordingly, the main object of the present invention is to make it possible to obtain sufficient water-stopping properties immediately and to cope with changes in the number and thickness of cables to be accommodated.

  Means therefor are a water stop device for stopping water between a cable and a protective pipe protecting the cable, and a water expansion sheet wound around the cable and attached to the cable from above the water expansion sheet The water stop device includes a packing having an outer peripheral surface in contact with the protective tube, and a water expansion layer that integrally absorbs moisture and expands on the outer peripheral surface of the packing.

  Another means is a water stop device that stops water between a cable and a protective tube that protects the cable, the water expansion sheet wound around the cable, and attached to the cable from above the water expansion sheet A water expansion layer having an inner peripheral surface in contact with the water expansion sheet and an outer peripheral surface in contact with the protective tube, and the inner peripheral surface and the outer peripheral surface of the packing absorb and absorb water Is a water stop device integrally formed.

  That is, after wrapping the water expansion sheet around the cable, attach the packing from above and insert it into the protective tube, and if the wound water expansion sheet and the water expansion layer of the packing absorb water, they immediately expand. And water-stopping properties can be obtained.

  According to this invention, the water stoppage is obtained by the expansion of the water expansion sheet and the water expansion layer, so that the water stop can be performed immediately.

  Moreover, since the water expansion sheet | seat wound around a cable is provided, it is easy to respond to the difference in the number and thickness of a cable, and can use one type of packing in the case of multiple types.

Sectional drawing which shows the insertion state of a water stop apparatus. Sectional drawing which shows the insertion state of a water stop apparatus. The perspective view which shows the use condition of a water stop apparatus. The front view of packing. Sectional drawing of the packing which concerns on another example. The perspective view of the packing which concerns on another example. The perspective view of the packing which concerns on another example. Sectional drawing of the packing which concerns on another example. The front view of the packing which concerns on another example. The front view of the packing which concerns on another example. The half sectional view of the packing which concerns on another example. Sectional drawing of the packing which concerns on another example. The perspective view of the packing which concerns on another example. FIG. 14 is a longitudinal sectional view of the packing of FIG. 13. The longitudinal cross-sectional view of the packing which concerns on another example. Sectional drawing which shows the insertion state of the water stop apparatus using the packing of FIG. Section which shows the insertion state of the water stop apparatus which concerns on another example. The perspective view of an auxiliary intervention member. The exploded perspective view of a jig. The perspective view of the assembly | attachment state of a jig | tool. The perspective view of the use condition of a jig | tool.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
1 and 2 are cross-sectional views showing a state in which a water stop device 31 that stops water between the cable 11 and the protective tube 12 is inserted into the end portion of the protective tube 12, and the shape of the protective tube 12 ( The protective tube 12 of FIG. 1 has a constricted portion 12a at the end, while the protective tube 12 of FIG. 2 is formed straight.) The basic configuration is the same, although the specific shape differs. .

  That is, the water expansion sheet 41 wound around the cable 11 and the packing 51 attached to the cable 11 from above the water expansion sheet 41, the inner peripheral surface 51 a in contact with the water expansion sheet 41 in the packing 51 and the protective tube 12. Water expansion layers 52 and 53 that absorb moisture and expand are integrally formed on at least the outer peripheral surface 51b of the outer peripheral surface 51b in contact with.

  Hereinafter, the water stop device 31 corresponding to the protection tube 12 having the shape shown in FIG. 1 will be mainly described as an example, but the same applies to the water stop device 31 corresponding to the protection tube 12 having the shape shown in FIG. is there.

  The water expansion sheet 41 has a belt-like shape as shown by phantom lines in FIG. 3 and expands when it absorbs moisture, and is composed of, for example, a nonwoven fabric and a water expansion material. Polyethylene terephthalate or the like is used for the non-woven fabric, and a granular material, a sheet-like material, a liquid material, a fibrous material, or the like is appropriately used for the water expansion material.

  The packing 51 is made of an annular rubber (synthetic rubber or natural rubber) that fits into the end of the protective tube 12, and has the water expansion layers 52 and 53 that are integrally formed.

  The inner peripheral surface 51a in contact with the water expansion sheet 41 wound around the cable 11 has the same diameter throughout the length direction (insertion direction) of the packing 51 as shown in FIG. 1, but the outer peripheral surface 51b in contact with the protective tube 12 Has irregularities corresponding to differences in the shape and diameter of the inner peripheral surface of the end portion of the protective tube 12. In the figure, 54 is a return. And as shown in FIG. 3, FIG. 4, it has in part a crack 55 which connects these inner peripheral surface 51a and outer peripheral surface 51b. The packing 51 can be attached to the cable 11 by opening at the crack 55.

  As shown in FIG. 4A, the cracks 55 may be in contact with each other or close to each other, or may be in a defective state without being in contact with each other as shown in FIG. 4B. The hardness of the rubber is set as appropriate. For example, the hardness unit HA according to a 5 durometer hardness test of JIS standard K6253 is preferably about 50 to 70 HA. If it is too soft, it may move according to the cable, and if it is too hard, it will be difficult to fit in the protective tube 12.

  Further, water expansion layers 52, 53, and 56 are formed on the entire inner peripheral surface 51 a, the portion on the rear end side in the insertion direction with respect to the return of the outer peripheral surface 51 b, and the end surface 55 a of the crack 55. The water expansion layer 56 is formed by integrating a water expansion sheet, which is formed in the same manner as the water expansion sheet 41, at the three locations of the packing. The integration can be performed by integrally molding the packing 51, or can be performed by pasting after the packing 51 is molded.

  In the water stop device 31 configured as described above, first, as shown in FIG. 3, the end of the protective tube 12 of the cable 11 accommodated in the protective tube 12 (see FIGS. 1 and 2) (tube opening) is close. The water expansion sheet 41 is wound around the position. The amount of the water expansion sheet 41 to be wound is appropriately changed depending on whether the number of cables 11 to be accommodated is one, two, or three. That is, in the case of one, it winds up more than the case of two and three. In the case of two or three, after the water expansion sheet 41 is wound around each cable 11, the water expansion sheet 41 is further wound after being bundled.

  Next, the packing 51 is opened at the crack 55, fitted from above the water expansion sheet 41 wound around the cable 11, and attached to the cable 11. In this state, the packing 51 and the water expansion sheet 41 are inserted into the end portion (tube opening) of the protective tube 12 while shifting. Then, the state shown in FIGS. 1 and 2 is obtained.

  When the water expansion sheet 52 and the water expansion layers 52, 53, and 56 of the packing 51 absorb moisture in this state, they immediately expand and a water stop state is obtained. For this reason, there is no possibility of water leaking as in the case of the prior art using the water-swellable rubber composition.

  Moreover, since the water expansion sheet | seat 41 wound around the cable 11 is provided and the packing 51 is attached after this water expansion sheet | seat 41 is wound, water stop can be performed irrespective of the difference in the number of cables 11, and thickness. .

  Further, since the packing 51 itself does not expand, it has a certain hardness even in a water-stopped state. For this reason, removal is also possible.

  In addition, since the structure has the packing 51 in part, the hardness of the water stop portion can be obtained as compared to the case where the water expansion sheet 41 is only wound around the cable 11 to stop the water. That is, when the water expansion sheet 41 expands, it becomes elastic, but this water expansion sheet 41 plays an auxiliary role to the last, and the packing 51 is the main body and is integrated with the water expansion sheet 41 to stop water. Therefore, a strong water stop state is obtained.

  In addition, since the water expansion layers 52, 53, and 56 of the packing 51 are integral with the rubber constituting the packing 51, there are cracks between the packing 51 and the water expansion sheet 41, between the packing 51 and the protective tube 12. In 55, a good water-stopping state can be obtained.

Next, another example of the structure of the packing 51 will be described. In this description, parts that are the same as or equivalent to the previous structure are given the same reference numerals, and detailed descriptions thereof are omitted.
FIG. 5A is a cross-sectional view of the packing 51. As shown in FIG. 5, the end on the back side of the constricted portion 12a of the protective tube 12 without forming the large barbs 54 as shown in FIG. This is an example in which a small barb 54 that slightly catches the portion is formed, and a water expansion layer 53 is formed on the entire outer peripheral surface 51b. Since the water expansion layer 53 improves the sliding with respect to the protective tube 12 as compared with the case where the rubber is exposed, the packing 51 can be easily inserted and the insertion state can be ensured.

  FIG. 5B is an example in which a protrusion 57 is formed on the inner peripheral surface 51 a of the packing 51. That is, the protrusion 57 that protrudes in the inner peripheral direction and hooks and moves the water expansion sheet 41 wound around the cable 11 is provided at the end of the inner peripheral surface 51a on the rear end side in the insertion direction. A water expansion layer 53 is also formed on the protrusion 57. Since the protrusions 57 are provided, when the packing 51 is inserted into the protective tube 12, the packing 51 and the water expansion sheet 41 are not displaced, and the operation is easy.

  FIG. 5C shows an example in which the packing 51 is configured in two layers. That is, in this example, the inner layer 51c has a lower hardness than the outer layer 51d and the inner layer 51c is more easily deformed. Since the flexibility of the inner layer 51c is higher than that of the outer layer 51d, it is easy to accommodate the difference in the number and thickness of the cables 11 to be accommodated and the amount of winding of the water expansion sheet 41. Moreover, since the hardness of the outer layer 51d is ensured, the insertion state can be maintained.

  FIG. 6 shows an example in which a recess 55 b and a projection 55 c that mesh with each other are formed in the crack 55. A water expansion layer 56 is also formed on the concave portion 55b and the convex portion 55c. When the concave portion 55b and the convex portion 55c are formed in this way, it is possible to prevent the packing 51 from being displaced so as to be twisted at the crack 55 portion, to avoid an unexpected disconnection and to ensure a good water stop state. You can be sure.

  FIG. 7 shows an example in which the annular packing 51 is divided into two. That is, the packing 51 is formed in a semicircular shape when viewed from the front, and a concave portion 55b and a convex portion 55c are formed that mesh with opposing surfaces that abut each other. A water expansion layer 56 is also formed on the concave portion 55b and the convex portion 55c. Due to the split structure, the attachment to the cable 11 can be performed very easily.

  FIG. 8 shows an example in which an annular groove 58 that is long in the length direction of the packing is formed on the end surface of the packing 51 in the insertion direction front end side. The groove portion 58 is for deforming a portion on the outer peripheral side of the groove portion 58 and is deformed in a direction of reducing the diameter when inserted into the protective tube 12 so that the insertion can be easily performed. A water expansion layer 58 a is formed on the inner surface of the groove portion 58. For this reason, after the packing 51 is inserted into the protective tube 12, when the water expansion layer 58 a of the groove portion 58 expands, the outer peripheral portion of the groove portion 58 is less likely to be deformed, and a reliable retaining can be performed.

  FIG. 9 is a front view of the packing 51, and the packing 51 shows an example in which the crack 55 is formed in an arc shape so as to cope with the difference in the diameter of the protective tube 12. In the figure, the broken lines are a concave portion 55b and a convex portion 55c formed in the crack.

  FIG. 10 is a front view of the packing 51, which is an example in which the inner peripheral surface 51a is formed in an irregular shape instead of a circular shape. That is, the inner part of the inner peripheral surface 51a has a shape having three arc-shaped dents so that it can be attached to three cables that are aligned. Then, two detachable pieces 59a and 59b are attached so that even if one or two cables are used, they can be used so as to fit closely. The two pieces 59a and 59b can be attached to two cables by first fitting a first piece 59a having a protrusion on a part of a columnar shape with the first piece 59a fitted thereto. This is a cylindrical second piece 59b that is fitted in one recess and can be attached to one cable. On the outer peripheral surfaces of the first piece 59a and the second piece 59b, a water expansion layer 59c is formed by integrating a water expansion sheet similar to the above water expansion sheet. By attaching the detachable pieces 59a and 59b in this manner, a tighter attachment state can be obtained and the water stop performance can be improved.

  11 is a half sectional view showing another example of the packing 51 used in the protective tube 12 having the straight shape shown in FIG. That is, it has the some protruding item | line 60 on the outer peripheral surface 51b formed in the taper shape as a whole. The ridge 60 contributes to retaining the sloping inclined surface 60a on the front end side in the insertion direction and the steep inclined surface 60b on the rear end side in the insertion direction.

  FIG. 12 also shows an example of the packing 51 used for the protective tube 12 having the straight shape shown in FIG. Although this packing 51 is inclined so that the outer peripheral surface 51b has a larger diameter toward the rear end side in the insertion direction, an example is shown in which the wall thickness is the same throughout the length direction (insertion direction). In other words, the inner peripheral surface 51a is not the same diameter over the entire length direction, but the rear end side in the insertion direction has a large diameter.

  A plurality of grooves 61 cut in the length direction are formed on the rear end side in the insertion direction. The grooves 61... Reduce the diameter of the rear end side in the insertion direction of the packing 51 when the packing 51 is inserted into the protective tube 12, and when inserted, the entire outer peripheral surface 51 b is the inner peripheral surface of the protective tube 12. It is comprised so that it may contact. In such a configuration, even if the water expansion layer 53 on the outer peripheral surface 51b of the packing 51 expands, no force in the pulling direction is applied to the packing 51, and inconveniences such as the packing 51 being pulled out are avoided. It is possible to maintain a good water stoppage state. In FIG. 12, for the sake of convenience, the water expansion sheet 41 and the cable 11 are omitted.

  FIG. 13 is a perspective view of the packing 51 and shows another example of the packing 51 used for the protective tube 12 having the constricted portion 12a. The packing 51 is designed so that it can be removed (disassembled) after use for water stop and can be performed very easily and appropriately.

  The packing 51 is formed in an annular shape (cylindrical shape) that is long in the insertion direction, and a barb 54 is formed on the outer peripheral surface of the end portion on the distal end side in the insertion direction to be engaged with the end portion on the back side of the constricted portion 12a of the protective tube 12. Has been. This barb 54 is formed of a piece extending from the end surface toward the oblique outer periphery side in the insertion direction rear end side, and has a hollow structure having a substantially horizontal letter shape. In the drawing, reference numeral 54a denotes a space portion. Due to the presence of the space portion 54a, the barb 54 is bent and deformed.

Moreover, the collar part 62 which protrudes in an outer peripheral direction is formed in the edge part of the insertion direction rear end side. The flange 62 is not only formed in a shape corresponding to the end of the protective tube 12 as in the case of the packing 51 shown in FIG. . That is, the flange 62 has a larger diameter than the protective tube 12 and is formed thicker in the insertion direction as shown in FIG. For this reason, it is possible to regulate the insertion state to be constant, eliminate excess or deficiency of the insertion state, and obtain a reliable water stop state. The thickness t ₁ of the collar portion 62 is set to a thickness necessary for holding the anchor nut 63.

  That is, the anchor nut 63 is embedded in the flange portion 62 and has a screw hole 63a extending in the insertion direction of the packing 51, and this screw hole 63a opens on the end surface on the rear end side in the insertion direction of the packing 51. Three anchor nuts 63 are embedded at equal intervals. The anchor nut 63 is used when the packing 51 is removed.

  In the case where the packing 51 has a structure as shown in FIG. 2 and the like without the flange portion 62 (when the packing 51 is used for the protective tube 12 having a straight shape), the anchor nut 63 is The main body 64 that is long in the insertion direction may be embedded in the end on the rear end side in the insertion direction.

  Moreover, the protrusion 57 which protrudes in the inner peripheral direction from the internal peripheral surface 51a is formed in the end surface of the insertion direction rear end side of the packing 51 over the perimeter.

The main body 64 having the barbs 54, the flanges 62, and the protrusions 57 is set to be thick in this example, but is set to be thin in this example. The thickness t _2, for example set thinner than the thickness t ₁ of the flange portion 62, which allows deformation.

  The packing 51 is made of rubber in the same manner as described above, but may be formed harder than the above example. For example, the hardness unit HA according to the JIS standard K6253 5 durometer hardness test is about 70 to 95 HA, preferably about 90 to 95 HA. Since the structure as described above, in particular, the barb 54 has a hollow structure, it is easy to fit into the protective tube 12 even if the material is hard.

  Further, a water expansion layer 53 is formed integrally between the barbs 62 and the barbs 62 on the outer peripheral surface 51b, but no water expansion layer is provided on the inner peripheral surface 51a as shown in FIG. Alternatively, the water expansion layer 52 may be provided as shown in FIG.

  The packing 51 thus configured is used in the same manner as described above. That is, the water expansion sheet 41 is wound around a position near the end (tube opening) of the protective tube 12 of the cable 11 accommodated in the protective tube 12 (see FIGS. 1 and 2). In the example shown in FIG. 16, the case where the cable 11 to accommodate is one is shown.

  After the water expansion sheet 41 is wound around the cable 11, the packing 51 is opened at the crack 55, fitted from above the water expansion sheet 41 wound around the cable 11, and attached to the cable 11. In this state, the packing 51 and the water expansion sheet 41 are inserted into the end portion (tube opening) of the protective tube 12 while shifting. Since the protrusion 57 formed on the inner peripheral surface 51a of the packing 51 hooks and holds the water expansion sheet 41, the protrusion 57 moves without shifting and becomes in the state shown in FIG.

  When the water expansion sheet 52 and the water expansion layers 52, 53, and 56 of the packing 51 absorb moisture in this state, they immediately expand and a water stop state is obtained. For this reason, there is no possibility of water leaking as in the case of the prior art using the water-swellable rubber composition.

  In addition, when the cable 11 is thinner than the diameter of the inner peripheral surface 51a of the packing 51, or when holding a plurality of cables 11, the inner peripheral surface of the packing 51 as shown in FIG. An auxiliary interposing member 71 interposed between the water expansion sheet 41 wound around 51a and the cable 11 may be used.

  As shown in FIG. 18, the auxiliary intervention member 71 has a cylindrical shape, and has a fitting groove 72 that fits into the protrusion 57 in the packing 51 on the outer peripheral edge of the end surface on the rear end side in the insertion direction. And like the packing 51, the crack 73 connected from an outer peripheral surface to an inner peripheral surface is provided. Like the packing, it is made of rubber, and the same water expansion layers 74 and 75 as those formed on the packing 51 are formed on the outer peripheral surface 71b and the inner peripheral surface 71a as necessary. FIG. 18A is an example in which the water expansion layer 75 is formed on the outer peripheral surface 71b, and FIG. 18B is an example in which the water expansion layer 74 is formed on the inner peripheral surface 71a in addition to the outer peripheral surface 71b. . When the water expansion layer 75 is formed on the outer peripheral surface of the auxiliary intervention material 71, the packing 51 without the water expansion layer 52 on the inner peripheral surface 51 a can be used as the packing 51. It is sufficient that at least one water expansion layer is formed between the packing 51 and the auxiliary intervention member 71.

  18 shows an example in which the inner peripheral surface 71a of the auxiliary intervention member 71 is circular in cross section, but it may be an irregular shape as in the example shown in FIG.

  Note that when the fitting groove 72 is fitted into the protrusion 57 of the packing 51, the auxiliary interposing member 71 is positioned at the end 54 of the packing 51 as shown in FIG. If the length is set so as not to overlap with the position of, the barb 54 can be easily deformed when the packing 51 is removed.

  If the auxiliary intervention member 71 is provided as described above, the water can be reliably stopped regardless of the number of cables 11 and the difference in thickness.

  FIG. 19 shows a jig 81 used when removing the packing 51 in order to dismantle the water stop device 31 using the packing 51 shown in FIG. That is, the packing 51 is pulled out using the anchor nut 63. Drawing is performed in the longitudinal direction of the cable 11 so that the cable 11 does not hurt.

  The jig 81 is composed of a plurality of metal members combined with each other. That is, the base plate 82, the attracting plate 83, the driven plate 84, the support shaft 85, the locking shaft 86, and the attracting bolt 87 are configured.

  The base plate 82 has a substantially square plate shape, and a hole 82a is formed in the central portion. The hole 82a has a notch 82b communicating with one side. The notch portion 82b and the hole portion 82a are formed to have a size through which the cable 11 to be held is passed, and the hole portion 82a is formed to have a larger diameter than the packing 51 having the flange portion 62.

  Since the packing 51 fixed as shown in FIG. 19 is fixed so that the end surface on the distal end side in the insertion direction of the flange portion 62 is flush with the wall surface 91 in which the holding tube 12 is embedded, the hole 82a is formed in the packing. The base plate 32 can be brought into contact with the wall surface 91 even when the packing 51 is present.

In addition, screw holes 82c are formed at two locations (two of the four corners) on the diagonal of the base plate 82. The screw hole 82c is for fixing the support shaft 85 for allowing the attracting plate 83 to contact with and separate from the base plate 82 on the base plate 82.
The support shaft 85 is constituted by a bolt having a male screw 85a formed at the tip.

  Similarly to the base plate 82, the attracting plate 83 has a substantially rectangular plate shape, and a hole portion 83a is formed at the center portion. The hole portion 83a has a cutout portion 83b that communicates with one side. The notch 83b and the hole 83a are formed in a size that allows the cable 11 to be held to pass therethrough.

  A portion of the base plate 82 corresponding to the screw hole 82c has a through hole 83c into which the support shaft 85 is inserted, and screw holes 83d are formed at two other diagonal lines. The screw hole 83d is used for attracting and moving the attracting plate 83 away from the base plate 82 from a position close to the base plate 82, and the attracting bolt 87 is screwed therein.

  The attracting bolt 87 is screwed into the screw hole 83 d of the attracting plate 83, and the tip is pressed against the base plate 82 to separate the attracting plate 83 from the base plate 82.

  The follower plate 84 is placed on the attraction plate 83 and moves in a direction away from the base plate 82 as the attraction plate 83 moves, and is formed in a substantially horseshoe-shaped plate shape. That is, a circular hole 84a is formed at the center of the disc, and a notch 84b having the same width as the diameter of the hole 84a is formed from the hole 84a to the edge. The size of the driven plate 84 is such that it overlaps with the peripheral edge of the hole 83a of the attracting plate 83, and the hole 84a has at least a size through which the cable 11 to be held is passed.

  Three groove portions 84c corresponding to the three anchor nuts 63 embedded in the packing 51 are formed on the inner peripheral edges of the hole portion 84a and the notch portion 84b. The groove 84c is formed so as to cut from the inner peripheral edge to the outer peripheral side. Further, the groove 84 c is a portion through which the locking shaft 86 that prevents the driven plate 84 from being separated from the anchor nut 63 is screwed and fixed to the anchor nut 63 of the packing 51.

  The locking shaft 86 is formed of a bolt having a male screw 86a screwed to the anchor nut 63 on the distal end side and having a flange 86b in the middle in the longitudinal direction. When the collar portion 86 b hits the upper surface of the driven plate 84, the driven plate 84 is prevented from moving on the locking shaft 86 and being separated from the packing 51.

  Each of these members is integrated by combining the base plate 82 and the attracting plate 83 with the support shaft 85 and then being integrated, and then the portion of the locking shaft 86 on the tip side of the flange 86b is fitted into the groove 84c of the driven plate 84. Further, the male screw 86 a at the tip of the locking shaft 86 is screwed into the anchor nut 63 of the packing 51. At this time, since the direction of the circumferential direction of the packing 51 is not constant, the direction of the driven plate 84 is appropriately changed according to the direction of the packing 51. When the locking shaft 86 is fixed to the anchor nut 63, the positional relationship between the members is determined as shown in FIG. Finally, the attracting bolt 87 may be screwed into the screw hole 83d of the attracting plate 83. The assembling procedure can be changed as appropriate, such as holding the attracting bolt 87 first.

  After fixing the jig 81 to the packing 51 in this way, when the attracting bolt 87 is rotated in the screwing direction, the attracting plate 83 is attracted as shown in FIG. By this operation, the packing 51 is pulled and pulled out from the protective tube 12.

  At this time, since the barb 54 of the packing 51 has a hollow structure and is deformed, a force is required, but the packing 51 can be pulled out reliably. Since the packing 51 is pulled straight in the length direction of the cable 11, the cable 11 is not damaged unlike the case where the packing is taken out by performing an operation of opening the packing 51. Further, when the foamed resin is filled and the water is stopped, the hardened foam is broken with a drill or the like to be disassembled. However, the cable 11 can be prevented from being damaged at this time.

In correspondence between the configuration of the present invention and the configuration of the above-described one form,
The hard portion of the present invention corresponds to the outer layer 51d described above,
The soft part corresponds to the inner layer 51c described above,
The present invention is not limited to the above-described configuration, and other forms can be adopted.
For example, the inner peripheral surface 51a of the packing 51 may have a shape other than a circle.

  Moreover, the protrusion 57 as shown in FIG. 5B is also provided at the end on the distal end side in the insertion direction, and the water expansion sheet can be sandwiched between the two protrusions 57. The integrity of the packing 51 and the water expansion sheet 41 can be enhanced. Furthermore, such a protrusion can also be provided in a portion other than the end portion of the inner peripheral surface.

  The members constituting the jig 81 are not all separate members, but may be constituted of members integrated in advance as appropriate, such as a driven plate 84 and a locking shaft 86, for example.

DESCRIPTION OF SYMBOLS 11 ... Cable 12 ... Protective tube 12a ... Constriction part 31 ... Water stop device 41 ... Water expansion sheet 51 ... Packing 51a ... Inner peripheral surface 51b ... Outer peripheral surface 51c ... Inner layer 51d ... Outer layer 52, 53, 56 ... Water expansion layer 54 ... Return 54a ... Space 55 ... Crack 57 ... Projection 62 ... Gutter 63 ... Anchor nut 63a ... Screw hole 71 ... Auxiliary interposing member 72 ... Fitting groove 74, 75 ... Water expansion layer 81 ... Jig 82 ... Base plate 82a ... Hole part 83 ... Attracting plate 83a ... Hole part 83d ... Screw hole 84 ... Driving plate 85 ... Support shaft 86 ... Locking shaft 87 ... Attracting bolt

Claims (10)

A water stop device for stopping water between a cable and a protective pipe protecting the cable,
A water expansion sheet wound around the cable;
A packing attached to the cable from above the water expansion sheet, and having an outer peripheral surface in contact with the protective tube,
A water stop device in which a water expansion layer that absorbs moisture and expands is integrally formed on an outer peripheral surface of the packing. A water stop device for stopping water between a cable and a protective pipe protecting the cable,
A water expansion sheet wound around the cable;
The gasket is attached to the cable from above the water expansion sheet, and has a packing having an inner peripheral surface in contact with the water expansion sheet and an outer peripheral surface in contact with the protective tube,
A water stop device in which a water expansion layer that absorbs moisture and expands is integrally formed on an inner peripheral surface and an outer peripheral surface of the packing. 3. The water stop device according to claim 1, wherein the packing has a ring shape and has a part of a crack communicating from the outer peripheral surface to the inner peripheral surface. 4. The water stop device according to any one of claims 1 to 3, wherein a protrusion projecting in an inner peripheral direction is formed at an end portion of the inner peripheral surface of the packing. The water stop device according to any one of claims 1 to 4, wherein the packing is integrally provided with a hard portion and a soft portion arranged in the radial direction. At the end of the packing in the insertion direction front end side, a barb is formed that engages with the back end of the constricted portion formed in the protective tube,
The water stop device according to any one of claims 1 to 5, wherein the barb is formed in a hollow shape. The water stop device according to any one of claims 1 to 6, wherein a flange portion having a diameter larger than that of the protective tube is formed at an end portion on the rear end side in the insertion direction of the packing. An anchor nut having a screw hole extending in the packing insertion direction is embedded in the packing,
The water stop device according to any one of claims 1 to 7, wherein the screw hole is opened on an end surface on a rear end side in the packing insertion direction. The auxiliary interposition member interposed between the inner peripheral surface of the packing and the water expansion sheet wound around a cable is provided. Water stop device. A base plate having a hole with a diameter larger than that of the packing;
An attracting plate located on the base plate and having a hole for passing the cable;
A support shaft for supporting the attracting plate on the base plate so as to be movable toward and away from the base plate;
A follower plate that is superimposed on a peripheral edge of the hole on the attraction plate and moves according to the attraction movement of the attraction plate;
A locking shaft fixed to the anchor nut embedded in the packing and locked to prevent the driven plate from being separated from the anchor nut;
The jig used for the water stop device according to claim 8 or 9, further comprising an attraction bolt for attracting the attraction plate, screwed into a screw hole formed on the attraction plate and having a tip abutting against the base plate. .

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