JPH0578139U - Waterproofing device for cable conduit - Google Patents

Abstract

(57) [Abstract] [Purpose] The whole body is elastically deformed by the screwing and tightening action, and the outer peripheral surface of the cable and the inner surface of the conduit are pressed against each other to achieve a watertight state and to withstand a great amount of water pressure. To do. [Structure] A seal block body 1 having an appropriate number of insertion holes 2 through which cables are inserted is formed of an elastic repellent material, and a pressing plate 7 integral with the seal block body 1 is formed on the back surface of the seal block body 1. Stick to it. A divided outer peripheral clamping board 15 is arranged on the front surface of the central pressing board 10 which is arranged in contact with the center of the front surface of the seal block body 1. Between the pressing plate 7 and the divided outer peripheral clamping plate 15, the seal block body 1 is clamped with a compression bolt 20 and a nut 21, and the seal block body 1 itself is expanded in the radial direction. Further, the divided outer peripheral clamping board 15 is slid in the radial direction, and the outer peripheral edge is pressed against the inner surface of the cable conduit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention can reliably and easily obtain waterproofing at the lead-in / introduction site when various types of cables are lead-in / out from a building, building, etc., for example, from a cave or a manhole. And a waterproofing device for a cable conduit.

[0002]

[Prior Art]

 Conventionally, when communication cables etc. are drawn in from various types of building structures from caverns, manholes, etc., since the caverns, manholes, etc. have been installed underground, the intrusion of rainwater, etc. It is waterproof and drained. In particular, various waterproofing means have been conventionally used because it is necessary to ensure a watertight seal at the site where the lead-in is introduced so as to prevent entry into the building structure.

This waterproofing means is a cable that is inserted into a pipeline such as a steel pipe or a waterproof cast iron pipe that is buried in the ground between an outdoor cave part, a manhole, etc. and an indoor building structure. It is a watertight seal between the outer peripheral surface and the inner surface of the pipeline. There are a general type waterproof device installed at the flange portion of the pipeline entrance, and an insertion type waterproof device installed outside the flange portion. In addition, there is a multi-cable transit type waterproof device in which cables that are inserted and wired through a wall member are directly watertightly sealed.

The general waterproofing device has a rigid inner packing material made of iron plate that abuts the inner surface of the stepped portion of the flange, a rigid outer packing material made of iron plate that abuts the outer surface of the flange, and the outer packing material as the flange. It consists of a screw fastening member that is fixed and tightened, and a seal compound material that is filled between the inner and outer packing materials around the cables that are inserted into the inner and outer packing materials.

The insertion-type waterproof device is made of a rigid tightening board made of an iron plate in the front and rear portions that is inserted and arranged in a pipe line, and made of an elastic material such as rubber interposed between the tightening boards in the front and rear portions. It consists of a packing material, these tightening boards, and screw-fastening members that fix the front and rear tightening boards together after inserting cables into the packing material.

In addition, the multi-cable transit type waterproof device has an outer frame member that is fitted and mounted in a penetration portion of a wall member to be inserted, and a segmented insert that inserts and supports each cable in the outer frame member. It consists of a block, a number of insert blocks held by a compression plate, and compression bolts that compress through the compression plate, and end packing that closes the gap between the outer frame material and the compression plate.

[0007]

[Problems to be solved by the device]

 However, these conventionally proposed waterproofing means, according to the general type waterproofing device, when the seal compound material itself does not follow the temperature change of the installation environment and there is no resilience, the cable is moved. There may be a gap between the cable and the cable and the water seal may be destroyed. Not only that, but due to the skill of the operator when filling the seal compound material, the filling amount, and other factors, the water-sealed state varies greatly, and it may not be possible to obtain a sufficient water-sealed state. Moreover, the construction takes time, and there is a drawback that the pipeline cannot be fully utilized due to the small penetration diameter of the cable.

When the water pressure inside the pipeline becomes high, the insertion-type waterproof device may be pushed out as it is because the resistance to the inner surface of the pipeline wall is small. As a result of being separated from each other, the water seal installation condition could be destroyed all at once.

Since the multi-cable transit type waterproof device uses special parts, it takes a lot of trouble to design and investigate the laying condition of cables in advance, and each part must be assembled in order. Therefore, not only is it time-consuming and time-consuming to install and remove, but it is also extremely expensive as compared with a general waterproof device.

In addition, in any of these conventional waterproof devices, the rubber packing material used has a relatively high hardness because sufficient pressure resistance against water pressure, deformation resistance, etc. are taken into consideration. It has a high hardness, for example, a hardness of about 40 degrees. However, with such a high hardness, when it is tightened and compressed, the tightening force acts only near the tightening position, and for example, it is tightened in the front and back by the screwing members that are inserted in the front and rear direction of the packing material. Even if it is tightened up and down, it does not reach the outer circumference of the cables covered by the packing material, and further the inner surface of the pipe. In other words, even if a tightening force is applied, the outer peripheral surface of the cables and the inner side surface of the conduit that do not have a gap are not elastically deformed, so that they are not hermetically closed, and in addition, in combination with the large hardness that they themselves have, Even if a large tightening force was applied, it was not deformed, and it was only fixed in shape.

Therefore, the present invention has been devised in view of various existing circumstances as described above, and by using a rubber seal block body which is different from the conventional one and is rich in elasticity and resilience, It is elastically deformed by the tightening action accompanied by screwing, and it is possible to realize a reliable watertight state by sufficiently pressing it against the outer peripheral surface of the cables and the inner surface of the pipeline, and even if a large amount of water pressure is applied to it. A cable that can withstand enough, has stable installation without shifting its installation position, is highly adaptable to various cables, and can be installed easily and securely, and is especially suitable for insertion into a cable conduit. The purpose is to provide a waterproofing device for conduits.

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, a cable conduit for inserting and supporting cables C in a water-sealed state into a rubber seal block body 1 inserted and arranged in a cable conduit P. Of the waterproof block, a pressing plate 7 integrally fixed to the seal block body 1 is provided on the back surface of the seal block body 1 in which an appropriate number of insertion holes 2 for inserting the cables C are formed. A central pressing board 10 arranged at the center of the front surface of the seal block body 1, and a plurality of divided outer peripheral clamping boards arranged on the front surface of the central pressing board 10 with the inside of the outer peripheral edge of the back surface contacting the outer peripheral edge of the central pressing board 10. 15 and a pressing bolt 20 for pressing the seal block body 1 between the pressing board 7, the central pressing board 10 and the divided outer peripheral tightening board 15 and screwing it together with the nut 21. Rublock body 1 The body is formed with a flexible hardness that expands in the radial direction by the screwing and tightening action, and the split outer peripheral clamping plate 15 is slid in the radial direction by the screwing action of the nut 21 to form the outer peripheral edge. Is pressed against the inner surface of the cable conduit P.

The hardness of the seal block body 1 itself can be configured to be about 25 degrees.

The seal block body 1 is formed in a long cylindrical shape along the pipe direction of the cable conduit P, and an appropriate number of insertion holes 2 through which the predetermined cables C are inserted are opened along the cylindrical direction. An open notch 3 for communicating one insertion hole 2 to the outside and a communication notch 4 for indirectly or directly communicating with the other insertion hole 2 through the insertion hole 2 are formed. In addition, the bolt insertion hole 6 can be formed.

The central pressing board 10 has a substantially U-shaped fitting insertion portion 11 cut out from the outer peripheral edge corresponding to each position of the insertion holes 2 from the front side, and when viewed from the front side, it is basically a disk shape. It can be configured by opening a through hole 12 into which the threaded portion of the compression bolt 20 is inserted.

The divided outer peripheral tightening board 15 has a slightly larger diameter than the central holding board 10, and is divided according to the number of bolt insertion holes 6 in the central holding board 10. It can be formed in a fan shape.

Further, the divided outer peripheral tightening board 15 has a slightly long fixing hole 17 formed along the radial direction of the divided outer peripheral tightening board 15 itself at a position corresponding to the position of the bolt insertion hole 6. A pressure contact taper surface 18 in the form of a weight body is formed at the opening end of the fixing hole 17 on the front surface side of the tightening board 15 itself at the center side of the divided outer circumference tightening board 15 itself. Inside the outer peripheral edge on the back surface, a slide taper surface 19 may be formed so as to be in contact with the outer peripheral edge of the central presser plate 10 and have a diameter that increases in order.

The nut 21 can be configured such that the end portion on the screwing side has a tapered surface.

Into the insertion hole 2, a cylindrical cable spacer 25 having a substantially T-shaped side surface having a flange piece 26 that abuts the back surface of the seal block body 1 and a rubber stopper member 27 are inserted. Can be configured as.

[0020]

[Action]

 In the waterproofing device for a cable conduit according to the present invention, there are provided a pressing plate 7, a central pressing plate 10, and a divided outer peripheral tightening plate 15 arranged before and after the seal block body 1 inserted and arranged in the cable conduit P. The sealing block body 1 as a whole is contracted in the column direction by the clamping bolts 20 and nuts 21 between them, and the seal block body 1 is expanded in the radial direction accordingly. Press it against the side.

At this time, since the seal block body 1 itself has a hardness of about 25 degrees, the pressing force by the pressing plate 7 and the central presser plate 10 spreads to the entire seal block body 1 and a partial stress distribution is generated. Without causing the above-mentioned problem, it is bulged in the radial direction in the cable conduit P and strongly pressed against the inner surface of the cable conduit P and the outer peripheral surface of the cables C inserted through the insertion holes 2, respectively, to realize a solid water-sealed state. ..

The nut 21 is screwed into the threaded portion of the compression bolt 20 projecting into the fixing hole 17 of the divided outer peripheral clamping board 15 arranged on the front surface of the central pressing board 10 through the press contact taper surface 18 to separate the divided outer circumference. At the same time as the tightening board 15 itself is pushed toward the back side of the central pressing board 10, the divided outer circumferential tightening board 15 is slid to the outer peripheral side by the slide taper surface 19 that abuts on the outer peripheral edge of the central pressing board 10. The sliding of the divided outer peripheral clamping board 15 to the outer peripheral side strongly presses the outer peripheral edge of the divided outer peripheral clamping board 15 against the inner side surface of the cable conduit P to prevent the entire movement.

The pressing board 7 and the central pressing board 10 respectively press the entire seal block body 1 in a cylindrical direction, and a plurality of divided outer peripheral tightening boards 15 arranged so as to cover the front surface of the central pressing board 10 are provided on the outside thereof. The central edge is pressed against the inner surface of the cable conduit P by the peripheral edge and is not moved, so that the central holding plate 10 is prevented from bulging forward. At the same time, for example, it sufficiently withstands the water pressure generated in the cable conduit P to prevent water leakage for a long time.

The open cut portion 3 and the connection cut portion 4 in the seal block body 1 respectively open the seal block body 1 in the lateral direction, and the cables C are directly inserted and arranged in the insertion hole 2.

The U-shaped fitting insertion portion 11 formed by cutting out from the outer peripheral edge of the central pressing board 10 is obstructed by the already inserted cables C when it is brought into contact with the front side of the seal block body 1. Instead, place them closely.

Further, the plurality of divided outer peripheral clamping plates 15 themselves are obstructed by the cables C already inserted into the seal block body 1 and the central pressing plate 10 closely arranged on the front surface of the seal block body 1. Instead, it is set at a predetermined position so as to cover the front surface of the central presser board 10.

The cable spacer 25 fitted into the insertion hole 2 allows the small diameter cables C to be inserted in a watertight manner, and the stopper member 27 closes the unnecessary insertion hole 2 in a watertight manner.

[0028]

【Example】

 BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in the drawings is a seal block body installed in a predetermined cable conduit P made of a waterproof cast iron pipe. The body 1 is formed in a columnar shape having an appropriate thickness (height) along the pipe direction of the cable conduit P, and a plurality of concavo-convex stripes are arranged in the columnar direction on the outer peripheral side surface.

The seal block body 1 itself is more flexible than the conventional rubber seal member of this type having a hardness of about 40 degrees, and is formed with a hardness of about 25 degrees, for example. ing. This hardness is, for example, when the seal block body 1 itself is applied with a compressive force from the front and rear directions thereof, that is, a compressive force along the pipe direction of the cable conduit P, only the compressed portion does not shrink, and At the same time as the length is reduced, the expansion and expansion of the seal block body 1 itself is allowed in the radial direction of the seal block body 1 itself, which is a direction substantially orthogonal to the direction of the compression force.

Further, an appropriate number of insertion holes 2 for inserting a predetermined cable C such as a metal cable or an optical cable are formed in the cylindrical seal block body 1 along the column direction, and one of the insertion holes is inserted. An open cut portion 3 that communicates the hole 2 with the outside and a communication cut portion 4 that directly or indirectly connects the open cut portion 3 to another insertion hole 2 through the insertion hole 2 are formed. .. The seal block body 1 shown in the figure has three through holes 2 of the same diameter, and is a Y-shaped connection when viewed from the front which communicates with the respective through holes 2 from the central position of the seal block body 1. The insertion holes 2 are connected to each other by the cutouts 4, and the cables C can be directly inserted and positioned in the insertion holes 2 by forcibly opening the cutouts 3 to the left and right. (See FIGS. 1 and 4). Of course, the inner diameters of the insertion holes 2 are different from each other, the arrangement of the insertion holes 2 is not located on the same circumference, the insertion holes 2 are connected by the communication notch 4, etc. Can be variously changed.

At the open end of the insertion hole 2, a cylindrical outer jacket portion 5 that closely fits to the outer circumference of the cables C inserted in the insertion hole 2 is projected. This outer jacket portion 5 will be described later. It is also intended to improve the adhesion to the metal central pressing board 10 and the divided outer peripheral clamping board 15.

In the main body portion of the seal block body 1, a plurality of bolt insertion holes 6 through which the compression bolts 20 having a square root structure for compressing and reducing the seal block body 1 are inserted are arranged along the column direction. Has been drilled.

A hard pressing plate 7 having high rigidity is integrally fixed to the back surface of the seal block body 1 and is made of metal such as iron. This pressing plate 7 itself is basically formed in a fan shape so as to cover the area between the insertion holes 2 along the circumference, and has notch portions corresponding to the insertion holes 2 on both sides. A ridge portion 8 is formed around the periphery of the rubber seal block body 1 for the purpose of integration with the main body of the seal block body 1. In addition, the pressing plate 7 is provided with a substantially rectangular engaging hole 9 into which the square root portion of the press-fastening bolt 20 is fitted so as to correspond to the position of the bolt insertion hole 6 formed in the seal block body 1. It has been drilled.

On the other hand, in the center of the front surface of the seal block body 1, there is arranged a central pressing board 10 which is in close contact with the front surface of the seal block body 1. Further, on the front surface of the central pressing board 10, the seal block body 1 is provided. A plurality of divided outer peripheral clamping plates 15 that are divided into an appropriate number along the circumferential direction in 1 are arranged so as to cover the front surface of the central pressing plate 10. The central presser plate 10 and the divided outer peripheral tightening plate 15 are made of a hard material having high rigidity, for example, a metal such as iron. It is supposed to be fixed.

The central pressing board 10 is fixed to the center of the front surface of the seal block body 1 to prevent the center block of the front surface of the seal block body 1 from bulging when the seal block body 1 itself is pressed. When viewed from the front, it basically has a substantially disk-like shape, and the U-shaped fitting insertion portion 11 is cut out from the outer peripheral edge corresponding to each of the two insertion hole positions when viewed from the front. Yes (see Figure 1). Then, when the fitting insertion portion 11 is aligned with each of the insertion hole 2 and the outer jacket portion 5, the through hole 12 through which the threaded portion of the tightening bolt 20 is inserted is made to correspond to the position of the bolt insertion hole 6. It has been opened.

The divided outer peripheral tightening board 15 is fixed to the seal block body 1 itself together with the central pressing board 10. The divided outer peripheral tightening board 15 slides to the outer peripheral side in accordance with the screwing by the pressure tightening bolts 20 and nuts 21 to be fixed, and The outer peripheral edge is pressed against the inner peripheral surface of the conduit P. The divided outer peripheral tightening board 15 has a slightly larger diameter than the central holding board 10 and is divided according to the number of bolt insertion holes 6 in the central holding board 10. It has a shape (see FIG. 5), and a fitting insertion portion 16 having a substantially semicircular shape when viewed from the front is cut out at the edge of the dividing radius line corresponding to each position of the insertion hole 2. Then, corresponding to the position of the bolt insertion hole 6, a slightly long fixing hole 17 is formed along the radial direction of the divided outer peripheral clamping board 15 itself, and the front side of the divided outer peripheral clamping board 15 itself is opened. A pressure contact taper surface 18 in the form of a weight is formed on the center side of the divided outer peripheral tightening board 15 itself at the opening end of the fixing hole 17 in the above (see FIG. 5), and on the rear surface of the divided outer peripheral tightening board 15 itself. Inside the outer peripheral edge, a slide taper surface 19 is formed so as to be in contact with the outer peripheral edge of the central presser plate 10 and whose diameter gradually increases (see FIG. 2).

Then, as shown in FIG. 2, the tip of the screw portion of the tightening bolt 20 inserted from the back side of the seal block body 1 is projected to the front surface of the central holding board 10 and the divided outer circumference tightening board 15, The nut 21 is screwed into this protruding portion. The end of the nut 21 itself on the screwing side is a tapered surface, and when the nut 21 is screwed in while being in contact with the pressure contact tapered surface 18 of the fixing hole 17, the divided outer peripheral clamping plate 15 itself. To push it toward the rear side of the central presser board 10. Also, as shown in FIG. 2, the slide taper surface 19 is in contact with the outer peripheral edge of the central holding plate 10 and does not move when the nut 21 is screwed into the press-fastening bolt 20. On the other hand, the divided outer peripheral clamping plate 15 acts to slide to the outer peripheral side. The sliding action due to the tapered surfaces of both of them 18 and 19 is not pushed back to the inner peripheral side while strongly pressing the divided outer peripheral clamping plates 15 to the front surface of the central pressing plate 10 as the nut 21 is screwed in. It is gradually slid toward the outer peripheral side, and is strongly pressed into the inner surface of the cable conduit P in a semi-engaging manner.

It should be noted that in the illustrated example, the center presser board 10 has a three-forked shape, and the divided outer circumferential tightening board 15 is shown as being divided into three parts. It is also possible to divide the board 10 into four or more branches and to form the divided outer peripheral tightening board 15 into four or more pieces correspondingly.

Further, reference numeral 25 shown in the drawing is a cable spacer, which closes a gap generated when the cables C having a diameter smaller than that of the insertion hole 2 formed in advance is inserted and wired, and is a seal. The block body 1 has a flange piece 26 that abuts the back surface of the block body 1 and is formed in a tubular shape having a substantially T-shaped side surface. Reference numeral 27 denotes a rubber stopper member, which fits the unnecessary insertion hole 2 through which the cables C are not inserted into the cable spacer 25 and closes it together with this.

The outer peripheral surface of the cable spacer 25 and the inner peripheral surface of the insertion hole 2 may be formed in a weight surface shape (not shown).

Next, to explain an example of use of this, a pressure bolt 20 having a square root structure is inserted and engaged from an engagement hole 9 of the pressing plate 7 on the back surface of the seal block body 1 to form a bolt insertion hole 6 And insert the tip screw portion to the outside of the front surface of the seal block body 1. On the other hand, the unnecessary insertion hole 2 is closed by the cable spacer 25 and the stopper member 27, and the cable spacer 25 is inserted into the insertion hole 2 through which the small diameter cables C are inserted.

Therefore, a predetermined cable C is inserted into the insertion hole 2 of the seal block body 1 opened by the opening notch 3 so that the back side of the seal block body 1 is located in the inner part of the cable conduit P. And push it into place. At this time, the seal block body 1 itself is pushed in about half at the pipe opening of the cable conduit P, so that the ease of the subsequent work can be obtained.

Next, the central holding plate 10 is placed in contact with the center of the front surface of the seal block body 1, the cables C are inserted in the fitting insertion portion 11, and the threaded portion of the compression bolt 20 is inserted in the through hole 12. The divided outer peripheral clamping plates 15 are arranged on the front surface of the central pressing plate 10, and the fixing holes 17 are aligned with the screw parts of the compression bolts 20. Then, after loosely screwing the nut 21 having a tapered surface at the screwing side end into the tightening bolt 20, the split outer peripheral tightening board 15 is reinserted into the cable conduit P. , Push it in until it reaches the installation position.

After that, by tightening the nut 21 again, the seal block body 1 is sandwiched by the pressing plate 7 on the back side of the seal block body 1 and the central holding plate 10 on the front side of the seal block body 1 and pressed in the column direction. Tighten. As a result, the entire seal block body 1 is contracted in the cylindrical direction, and accordingly, the seal block body 1 expands in the radial direction and is brought into water-tight contact with the inner peripheral side surface of the cable conduit P and the outer peripheral surface of the cables C, respectively. ..

On the other hand, when the nut 21 is screwed in, the divided outer peripheral clamping plates 15 are strongly pressed against the front surface of the central pressing plate 10 and are gradually slid toward the outer peripheral side to be strongly pressed against the inner side surface of the cable conduit P.

[0046]

[Effect of the device]

 This invention is configured as described above, and the seal block body 1 itself is made of rubber which is different from the conventional one and is rich in elasticity and resilience. It elastically deforms and comes into sufficient pressure contact with the outer peripheral surface of the cables C and the inner side surface of the cable conduit P, thereby realizing a reliable watertight state. Moreover, the central block 10 and the divided outer peripheral clamping plate 15 arranged on the front surface of the seal block body 1 strengthen the seal block body 1 together with the pressing plate 7 fixed to the rear surface of the seal block body 1. Even if a large amount of water pressure is applied, it withstands it sufficiently, and its installation position does not shift, resulting in excellent installation stability. Also, by combining and mounting the cable spacer 25 and the stopper member 27, the cable C has excellent compatibility with various cables C having different diameters, and the change in the number of insertions can be easily dealt with, which allows easy and reliable construction. It is a thing.

That is, since the seal block body 1 itself is formed with a flexible hardness that expands in the radial direction by the clamping action of the clamping bolt 20, it is mounted before and after this seal block body 1. When the pressing board 7, the central pressing board 10, and the divided outer peripheral tightening board 15 are pressed by the pressing bolts 20 and the nuts 21, the whole is reduced in the cylindrical direction and the radial direction thereof is reduced. Therefore, it is strongly pressed against the inner peripheral side surface of the cable conduit P in which the seal block body 1 is arranged and the outer peripheral surface of the cables C inserted through this. Therefore, the front and rear of the cable conduit P are reliably shut off in a watertight manner, and water leakage from the outdoor side to the indoor side is completely prevented.

In particular, the pressing action of the pressing bolt 20 and the nut 21 is carried out by screwing the seal block body 1 between the pressing plate 7, the central pressing plate 10 and the divided outer peripheral clamping plate 15. And the hardness of the seal block body 1 itself is approximately 25 degrees, the cable block P is bulged in the radial direction thereof, and the inner surface of the cable conduit P, The outer peripheral surfaces of the cables C are strongly pressed against each other.

Not only that, the screwing action of the nut 21 with respect to the press-fastening bolt 20 is such that the end of the nut 21 on the screwing side is a tapered surface, and therefore this tapered surface is a divided outer periphery. When it comes into contact with the press-contact taper surface 18 in the fixing hole 17 of the tightening board 15, the divided outer circumference tightening board 15 itself is pushed toward the rear side of the central pressing board 10, and at the same time, the slide taper surface of the contact divided outer circumference tightening board 15 is pushed. Since 19 is in contact with the outer peripheral edge of the central presser board 10, the divided outer peripheral clamping board 15 itself is slid to the outer peripheral side. Therefore, the outer peripheral edge of the divided outer peripheral clamping plate 15 is strongly pressed against the inner surface of the cable conduit P to firmly position the device itself in the cable conduit P, and also due to the water pressure generated in the cable conduit P or the like. Holds the installation position securely without displacement. In addition, according to the experimental results, it has been confirmed that the water pressure resistance can sufficiently withstand a water pressure of 5 atm, and it prevents water leakage for a long time, which is about 5 times that of the conventional one. It shows durability.

When the pressing plate 7, the central pressing plate 10 and the divided outer peripheral clamping plate 15 press the entire seal block body 1 in the column direction by the pressing action, for example, the water pressure generated in the cable conduit P is used. Even if is applied to the seal block body 1 via the pressing plate 7, the seal block body 1 itself is reinforced by the pressing plate 7, the central pressing plate 10, and the divided outer peripheral clamping plate 15, and at the same time, the central pressing plate. 10 The outer peripheral edge of the divided outer peripheral clamping board 15 which is pressed against the front surface is pressed against the inner surface of the cable conduit P so that the central pressing board 10 is prevented from bulging forward and the position shift of the device itself. To do.

Furthermore, since the open cut portion 3 and the communication cut portion 4 of the seal block body 1 respectively open the seal block body 1 in the lateral direction, the cables C are inserted in the insertion hole 2 from the side. Further, the U-shaped fitting insertion portion 11 of the central pressing board 10 can be inserted directly from the center pressing board 10 itself without being disturbed by the already inserted cables C. Can be closely arranged. In addition, each of the divided outer peripheral tightening boards 15 formed by dividing into an appropriate number are provided on the front surface of the central holding board 10 without being disturbed by the inserted cables C and the closely arranged central holding board 10. It can be set to a predetermined position from the side so as to cover the work, and both improve work efficiency.

Not only that, but since the central presser plate 10 and the outer peripheral tightening plate 15 can be formed thin, it is possible to reduce the weight of these members, and in the narrow cave parts and manhole parts. However, the workability is further improved, and compression bolts 20 and nuts 21 are used for compression of the seal block body 1, screwing of the pressing plate 7 with the central pressing plate 10 and the divided outer peripheral clamping plate 15. Only screwing work is required and workability is good.

By mounting the cable spacer 25 and the stopper member 27 in combination with the insertion hole 2, various cables C can be supported and the productivity is improved, and the quick delivery to the site is achieved. Therefore, the price can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view.

FIG. 2 is a side sectional view in a use state, and is a sectional view taken along line XX in FIG.

3 is a front view of the same and is a cross-sectional view taken along the line YY in FIG.

FIG. 4 is also a front sectional view taken along line ZZ in FIG.

FIG. 5 is a front view of one of the divided outer peripheral tightening boards.

[Explanation of symbols]

C Cables P Cable conduit 1 Seal block 2 Insertion hole 3 Open notch 4 Communication notch 5 Outer jacket 6 Bolt insertion hole 7 Pressing board 8 Projection 9 Engagement hole 10 Center presser board 11 Fitting insertion part 12 Through Hole 15 Split Peripheral Tightening Board 16 Fitting Insertion Part 17 Fixing Hole 18 Pressing Taper Surface 19 Slide Taper Surface 20 Pressing Bolt 21 Nut 25 Cable Spacer 26 Flange Piece 27 Stopper Member

Claims (8)

[Scope of utility model registration request] 1. A waterproofing device for a conduit for a cable, wherein a rubber seal block body inserted and arranged in a cable conduit is inserted and supported in a water-sealed state, and a suitable number of cables are inserted. , A pressing plate integrally fixed to the seal block body on the rear surface of the seal block body having a through hole formed therein, a central pressing plate disposed in the center of the front surface of the seal block body, and an inner peripheral edge of the rear surface. A plurality of divided outer peripheral clamping plates arranged on the front surface of the central pressing plate in contact with the outer peripheral edge of the central pressing plate, and a seal block body between the pressing plate, the central pressing plate and the divided outer peripheral clamping plates. The seal block body itself is formed with a flexible hardness that expands in the radial direction by the screwing and pressing action. Screw in A waterproofing device for a cable conduit, characterized in that the divided outer peripheral clamping plate is slid in the radial direction by the action so that the outer peripheral edge is pressed against the inner surface of the cable conduit. 2. A waterproofing device for a cable conduit according to claim 1, wherein the hardness of the seal block itself is about 25 degrees. 3. The seal block body is formed in a long cylindrical shape along the pipe direction of the cable conduit, and an appropriate number of insertion holes for inserting predetermined cables are opened along the cylindrical direction, and any one of them is formed. An open notch that connects the insertion hole to the outside,
The cable according to claim 1 or 2, wherein the open cut portion is formed with a connection cut portion that is indirectly or directly connected to another insertion hole through the insertion hole, and a bolt insertion hole is formed. Waterproofing device for conduit. 4. The central presser has a substantially U-shaped fitting insertion portion cut out from the outer peripheral edge when viewed from the front corresponding to each insertion hole position, and basically has a substantially disk shape when viewed from the front. The waterproof device for a cable conduit according to any one of claims 1 to 3, wherein a through hole for inserting the threaded portion of the press-fastening bolt is opened. 5. The divided outer peripheral tightening board has a slightly larger diameter than the central holding board, and is divided according to the number of bolt insertion holes in the central holding board, and is basically fan-shaped when viewed from the front. The waterproof device for a cable conduit according to any one of claims 1 to 4, which is present. 6. The divided outer peripheral tightening board itself has a slightly long fixing hole formed in the radial direction of the divided outer peripheral tightening board itself in correspondence with the bolt insertion hole position, and the divided outer peripheral tightening board itself. At the open end of the fixed hole on the front side of the split outer peripheral tightening board, a weight surface taper surface is formed on the center side of the split outer peripheral tightening board itself. 6. The cable conduit waterproofing device according to claim 1, wherein a slide taper surface is formed so as to be in contact with an outer peripheral edge of the board and having a diameter that increases in sequence. 7. The waterproofing device for a cable conduit according to claim 1, wherein the nut has a taper surface at the end on the screwing side. 8. A cylindrical cable spacer having a substantially T-shaped side surface having a flange piece that abuts against the back surface of the seal block body, and a rubber stopper member are inserted into the insertion holes. A waterproofing device for a cable conduit according to any one of claims 1 to 7.