JP4178528B2 - Block body for cable conduit formation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, a power cable, by embedding the like in the ground communication cable or optical fiber cable for use in building, it relates to a cable duct forming block body.
[0002]
[Prior art]
In order to construct a power cable network or a communication cable network in the ground, a hand hole is formed at a necessary distance, and a pipe is formed by connecting the opposite hand holes with cable insertion pipes. A required cable is inserted into the cable insertion tube so that the cable can be used safely and reliably.
[0003]
In forming such a conduit, as a means for connecting the tube end of the cable insertion tube to the hand hole, for example, in Japanese Utility Model Publication No. 55-33797, an opening of a predetermined size is provided in advance on the side wall on the connection side of the hand hole. The base end of a concrete block body in which a plurality of sleeves for receiving the tube end of the cable insertion tube are embedded is inserted into the opening, and the two are integrated with an adhesive or cement. The pipe end of the cable insertion pipe is inserted into each sleeve of the block body that is fixed to the hand hole and protrudes from the hand hole to form a pipe line.
[0004]
On the other hand, in Japanese Patent Application Laid-Open No. 9-144951, the applicant arranges one or more socket members in the front and rear direction in a block made of rigid polyurethane foam, and projects one end of the socket member from the block, A means for forming a conduit by fixing the block to a side wall of a hand hole installed at a key point in the ground is proposed.
[0005]
Further, in Japanese Patent Publication No. 6-11818, both ends of the connecting pipe that can receive the cable insertion pipe are brought into contact with the inner surfaces of the inner and outer molds for forming the side walls of manholes and the like, respectively, and are sandwiched between them. After pouring concrete into the formwork, the formwork is removed after the concrete is cured, and a short pipe having a collar is connected to the tip of the connection pipe in consideration of the overcoating allowance of the side wall. A means for forming a conduit by connecting a cable insertion tube to the rear end of the connection tube is disclosed.
[0006]
[Problems to be solved by the invention]
In the formation of conduits such as these known underground communication networks, the means disclosed in Japanese Utility Model Publication No. 55-33797 is a block body in which a sleeve capable of receiving a large number of cable insertion pipes is integrated with concrete. There is an advantage in that a pipe line can be formed by a very simple means of fixing the base end portion of the block body to one opening provided in the hand hole.
On the other hand, when the block body is configured, there is a problem to be solved in the manufacturing process, for example, it is necessary to provide a duct socket at the sleeve tube end on the handhole side and a tube connection socket on the other end side.
[0007]
On the other hand, in the formation of optical fiber cable networks with excellent characteristics as a communication method using light, optical fiber cables are different from power cables and communication cables, and have higher safety, that is, protection against water leakage and durability due to ground subsidence. In addition to being required to have a precise duct structure excellent in performance and earthquake resistance, it is also desired that construction work is easy and can be constructed at low cost.
[0008]
In order to satisfy these requirements, a cable line configuration system has been proposed in which an optical fiber cable is individually connected to a pipe member, and one or more outsides of the pipe member are further protected by a protective pipe.
However, the bell block described in each of the above publications cannot be applied to form a pipe line accurately and tightly between a pipe member and a hand hole provided with a protective pipe surrounding the pipe member. It is necessary to use a block for forming the conduit of the structure.
[0009]
In view of the present situation, the present invention can be applied to underground laying of optical fiber cables, and can also be used to form conduits for power cables and communication cables. It is intended to provide a simple cable conduit forming block body having a structure that is securely and securely held and has earthquake resistance.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a cable conduit forming block body according to claim 1 of the present invention comprises:
A plurality of socket members having receiving portions that can be slid within a range in which the tube end portions of the cable insertion tube can be exchanged for connecting the tube end portions;
The tip portion for integrally connecting and holding the plurality of socket members is composed of a cylindrical block member,
The base end of the block member has a shape that matches the mounting hole formed in the side wall of the hand hole, and
The outer peripheral surface of the cylindrical tip portion of the block member protruding from the side wall of the handhole is used as a protective tube mounting portion that covers all of the cable insertion tube.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A block body for forming a cable conduit according to the present invention includes a plurality of socket members capable of receiving a cable insertion tube, and a block member integrally connecting and holding the plurality of socket members at a predetermined interval. .
[0012]
The socket member is made of a pipe material having a diameter of about 50 to 100 mmφ, and the proximal end portion located on the handhole side is reduced in diameter by about one turn of the inner diameter of the pipe material through the shoulder. At the same time, the opening is expanded outside in a trumpet shape to form a guide for smooth cable insertion.
In the vicinity of one end, a rubber ring holding part for tightly holding the received cable insertion tube is formed to bulge outward, and the rubber ring is mounted and held in the concave part inside. It can be easily obtained by blow molding of plastic such as vinyl chloride resin.
[0013]
From the distal end side of the socket member to the reduced diameter portion on the proximal end side, the cable insertion tube can be slid and received, and a part of the inner peripheral surface of the acceptable portion can be received. The tube end of the cable insertion tube can be easily determined by forming a ring-shaped recess and using the marked line for determining the tube end position of the cable insertion tube.
[0014]
Such a socket member is, for example, arranged and fixed on the same circumference between a pair of molds held at a required interval.
After that, the resin concrete is poured into the mold to constitute a block member. When the block member is constructed, the rubber ring holding portion of each socket member and the outer periphery on the base end side connected to the rear thereof. A part of the portion may protrude from the front end surface of the block member, or the front end surface of each socket member and the front end surface of the block member may be flush with each other.
[0015]
At that time, since the base end side of the block member is fixed to the side wall portion of the hand hole, the socket member is held by the block member so that the opening on the base end side of each socket member does not protrude from the block member. Bundles are held.
[0016]
In addition, when attached, the outer peripheral part of the socket member located in the side wall of the hand hole is sanded to the outer periphery of the base end part, so that the familiarity with the resin concrete is improved, so that the block member securely Each socket member can be held in the socket.
[0017]
The base end portion of the block body in which a plurality of socket members are integrally coupled has a shape that matches the mounting hole of the block body formed in the side wall of the hand hole, and the outer peripheral surface projects from the side wall of the hand hole Is a mounting portion for a protective tube that simultaneously covers a plurality of cable insertion tubes.
The mounting portion has at least a certain length, that is, a length that enables exchange for connection of the cable insertion tube, and correspondingly, the socket member has a required length as described above. It is.
[0018]
In addition, the part of the block member serving as the mounting portion of the protective tube is generally cylindrical in consideration of ease of mounting, and the base end portion is rectangular or rectangular in consideration of connectivity with the handhole. The block member is preferably rectangular, but the block member may of course have a cylindrical shape.
[0019]
In order to form the cable conduit using the cable conduit forming block body having the above-described configuration, the block member base is installed on the wall surface on the connection side of the opposing handhole, which is installed in the ground at a required distance. The end portion is fixed, and the tube end portion of the cable insertion tube is inserted into the socket member provided on the block member.
Then, the cable insertion tube is slid until the tube end of the inserted cable insertion tube matches the marked line of the recess formed on the inner peripheral surface of the receiving portion of the socket member, and the cable insertion tube is surrounded by the protection. The end of the tube is fitted on the outer periphery of the tip of the block member protruding from the side wall of the hand hole, and the end of the protective tube is pushed into a position near the wall of the hand hole.
[0020]
Next, another cable insertion tube is sequentially connected to the opposite hand hole by socket connection or male / male engagement connection means at the tip of each cable insertion tube.
On the other hand, other protective tubes are also connected to the other end of the protective tube sequentially toward the opposite hand holes by appropriate connecting means.
[0021]
By connecting from both of these handholes, a connecting pipe member having a length substantially equal to the length of the distal ends of the cable insertion pipes that are close to each other with a gap therebetween is prepared separately, and at least one cable insertion pipe is Move to one handhole side by sliding to temporarily widen the distance between the cable insertion tubes.
After that, while the connecting pipe member is interposed inside the widened interval, the cable insertion tube moved back is returned to the original position, and the mutual connection is made by the socket connection or the male and female engagement connection. The cable insertion pipes are connected to each other by a connecting pipe member.
[0022]
In this operation, each protective tube is kept at an appropriate interval so as not to interfere with the interposition of the connecting pipe member.
When the connection between the cable insertion tubes is completed, the cable conduit can be formed by moving at least one of the protection tubes and connecting the end portions of the protection tubes close to each other by an appropriate means. .
[0023]
Inserting the cable from one hand hole into the inside of the cable insertion pipe of the pipe formed in this way, pulling it out from the other hand hole, and carrying out this in sequence can finish the underground burial of the cable. it can.
[0024]
The cable insertion tube for inserting and holding the cable is formed of a plastic such as hard vinyl chloride resin, and the protective tube surrounding and protecting the cable insertion tube is formed of flame-retardant polyethylene or polypropylene. is there.
In addition, this protective tube can withstand earth pressure by forming a straight tube on the inside and a so-called corrugated tube that integrates a tube with spiral or concave and convex lines on the outside. It is preferable in use.
[0025]
[Action]
A cable conduit forming block body according to the present invention comprises a plurality of socket members having a required length and a block member obtained by integrally connecting these socket members, and the base end portion of the block member is a side wall of a hand hole. The tip is projected from the side wall of the hand hole with a required length, and this projection is used as a protective tube mounting portion that covers the entire cable insertion tube.
Therefore, when forming the conduit, the tube end portion of the cable insertion tube can be slid by a required range within the socket member, that is, a length that allows exchange for connection of the cable insertion tube.
And since the said protection pipe is also slidably hold | maintained at the front-end | tip part outer periphery of a block member, when connecting between hand holes with a cable insertion pipe and a protection pipe, and comprising a cable conduit, not only of a cable insertion pipe but of course. In addition, the protective tube can also be connected by exchanging by slide.
[0026]
【Example】
Hereinafter, an embodiment of a cable conduit forming block body (hereinafter simply referred to as a forming block body) of the present invention and a method of forming a cable conduit using the forming block body will be specifically described with reference to the accompanying drawings. explain.
The forming block body 1 of the present invention shown in FIGS. 1 and 2 includes six socket members 3, 3... Made of hard vinyl chloride resin and these socket members 3, 3. The block member 2 is integrally connected.
[0027]
The block member 2 is composed of a cylindrical body having a required diameter and length, and a distal end portion 2a having an outer peripheral surface of the cylindrical body as a mounting portion of a protective tube, and a cross-section continuously connected to the distal end portion 2a. And a base end portion 2b having a thickness equal to the thickness of the side wall of the handhole.
The six socket members 3, 3... Are connected in parallel at a predetermined interval on the same circumference of the circular section of the distal end portion 2 a and open to the proximal end portion 2 b. It is.
[0028]
Each socket member 3 has its tip portion projected from the tip portion 2a of the block member 2 with a required length, and a cable insertion tube (to be described later) is received in the vicinity of the projecting tip opening portion. A rubber ring holding portion 4 for tightly holding the ring is formed from the inside toward the outside.
[0029]
Further, the socket member 3 is configured such that a portion having a required length from the distal end surface through the rubber ring holding portion 4 is linearly formed with the same inner diameter to form a receiving portion 5, and the inner depth is formed on the proximal end. A diameter-reduced portion 6 is formed by gradually reducing the diameter toward the portion side, and then a guide portion 7 that is gradually expanded in a trumpet shape is formed.
The outer peripheral surface on the base end side from the reduced diameter portion 6 is subjected to a sanding process for improving familiarity with the base end portion 2b of the block member 2.
[0030]
A mark line 5a for positioning the tube end of the inserted cable insertion tube is formed at a substantially central portion of the receiving portion 5.
The marked line 5a is formed by a concave portion formed in a ring shape on the inner peripheral wall, and can be easily formed by blow molding. When light is applied to the concave portion, a shadow is generated in the portion, and the position of the marked line 5a is determined. Can be easily and easily visually recognized.
[0031]
The forming block body 1 composed of the block member 2 and the socket members 3, 3... Is, for example, a handhole in which two block bodies 1 and 1 are disposed in the ground as shown in FIG. 8 is attached in contact with the side wall on the connection side up and down, and the periphery is fixed by hardening with resin concrete.
[0032]
Next, a cable conduit is formed by attaching a cable insertion tube and a protective tube between the forming block bodies 1 and 1 attached to the side wall of the handhole in a state of facing each other. The procedure will be described below. To do.
[0033]
First, as is apparent from FIG. 4, cable insertion pipes each made of a hard vinyl chloride resin pipe are inserted into the respective socket members 3, 3... Protruding from the block member 2 constituting the forming block body 1. When inserting the base end of the cable insertion tube 10 until the tube end coincides with the reference line 5a while applying light rays from the inside of the hand hole when individually inserting the tube end portions of the tube 10, the cable is positioned. The insertion tube 10 is tightly held on the forming block body 1 by a rubber ring 9 having an irregular cross section attached to the rubber ring holding portion 4 of the socket member 3.
[0034]
Next, a protective tube 13 made of flame retardant polyethylene or polypropylene, etc., which is integrated with a concavo-convex tube on the outside of a straight tube to withstand earth pressure, is surrounded by the cable insertion tubes 10, 10. Then, the end portion is attached to the outer peripheral portion of the distal end portion 2 a of the block member 2, and the end portion of the protective tube 13 is inserted to a position close to the side wall of the hand hole 8.
[0035]
The other cable insertion pipes 10 to be connected to the positioned cable insertion pipes 10 are sequentially connected toward the opposite hand holes by the sleeve 11 having a stopper 11a formed of a ridge on the central inner surface, and the like. The other protective tube 13 is sequentially connected to the other end of the protective tube 13 toward the opposite hand hole.
[0036]
The protection tubes 13 and 13 are connected to each other by engaging a female receiving port 14 formed at the end of one of the protective tubes 13 with a male receiving port 15 formed at the end of the protective tube 13 to be connected. By doing.
At this time, as shown in FIG. 6, the packing 16 and the lock ring 17 interposed between the concave and convex portions in the male receiving port 15 are hermetically connected.
[0037]
The cable insertion tube 10 and the protective tube 13 are sequentially connected from one hand hole to the opposite other hand hole, and the tip portions of the connected cable insertion tube and the protective tube come to face each other at short intervals. At the time, sleeves 11 and 11 having stoppers 11a are attached to the distal ends of the cable insertion pipes 10 and 10, and the connecting pipe member 12 having a length equal to the distance between the sleeves 11 and 11 and the stoppers 11a. Prepare separately.
Also, one cable insertion tube member 10 (the right cable insertion tube 10 in FIG. 4) is slid in the direction of the arrow to widen the gap between the two cable insertion tubes 10 and 10 facing each other.
[0038]
This sliding movement is configured so that the cable insertion tube 10 can be performed within the range of the receiving portion 5 of the socket member 3. In the case of FIG. 4, the marked line 5 a corresponds to the length of the sleeve 11. And the connecting pipe member 12 can be interposed between the sleeves 11 and 11.
At that time, since the inside of the socket member 3 on the hand hole side of the socket member 3 is reduced in diameter, the cable insertion tube 10 that slides is prevented from further movement.
In this operation, the protective tubes 13 and 13 are kept at a distance that does not hinder the interposition of the connecting pipe member 12.
[0039]
Next, as shown in FIG. 5, a connecting pipe member 12 is interposed in an interval portion widened by the slide of one cable insertion tube 10, and one end of the connecting pipe member 12 is connected to one sleeve 11. Install.
Next, by pulling the cable insertion tube 10 to the original position (leftward in FIG. 4) and attaching the other end of the connecting pipe member 12 to the other sleeve 11, both cable insertion tubes 10, 10. Can be connected together.
[0040]
In this final stage, the tube end position of the cable insertion tube 10 returns to the position of the marked line 5 a in the receiving portion 5 of the socket member 3.
Thus, after the connection of the six cable insertion tubes 10, 10... Is finished, the protective tube 13 is slid to the left as shown in FIG. By fitting the male receiving port 15 of the other protective tube 13, the packing 16 and the lock ring 17 interposed in the ridges of the male receiving port 15 are connected in an airtight manner to form one conduit.
[0041]
The protective tube 13 is close to the hand hole 8 but is not fixed, and is slidable with respect to the block member 2.
Therefore, depending on the connection distance between the cable insertion tubes 10 and 10, the end surface of the protection tube 13 may be separated from the wall surface of the handhole 8 as shown in FIG. 6.
In such a case, the resin concrete is solidified and kept airtight after installation.
[0042]
As for the slide of the cable insertion tube 10 and the protection tube 13, any one of the cable insertion tube and the protection tube may be slid as described above.
It can also be achieved by sliding both the cable insertion tube and the protection tube.
The cable conduit thus formed is inserted into the cable insertion tube 10 from one hand hole 8 and pulled out from the other hand hole 8, and this is sequentially performed to bring the cable into the ground as expected. Can be laid.
[0043]
FIG. 7 shows another embodiment of the block for forming a cable conduit according to the present invention.
The forming block body 21 is formed of a hard vinyl chloride resin, and the same six socket members 23, 23... As in FIG. 1 and the socket members 23, 23. And a block member 22 coupled to the.
[0044]
The block member 22 has a cylindrical shape with a required diameter and length as a whole, without the tip end portion 2a having a cylindrical body and the base end portion 2b having a rectangular cross section, like the block member 2 shown in FIG. It is what.
This cylindrical base end portion can be inserted into a circular mounting hole provided in the side wall of the hand hole 28 and fixed with resin concrete for mounting.
[0045]
Since this block member 22 is entirely cylindrical, it is not necessary to set the base end corresponding to the thickness of the side wall of the hand hole 28 as a particularly modified one. The outer peripheral surface of the tip portion protruding from can be used as a protection tube mounting portion.
[0046]
Further, the six socket members 23, 23,... Are parallel to each other on the same circumference of the circular cross section so that the tip ends thereof are flush with the tip ends of the block members 22. Is bound to.
[0047]
In the figure, 24 is a rubber ring holding portion, 25 is a cable insertion tube receiving portion, 25a is a marked line, 26 is a reduced diameter portion, and 27 is a guide portion.
These correspond to the rubber ring holding part 4, the receiving part 5, the marked line 5a, the reduced diameter part 6 and the guide part 7 shown in FIG.
[0048]
【The invention's effect】
A block body for forming a cable conduit according to the present invention is cylindrical and has a plurality of socket members each having a cable insertion tube receiving portion having a predetermined length, and a plurality of the socket members are integrally coupled, and a predetermined outer periphery of the tip portion is provided. It is comprised with the block member which has a protection tube mounting part of length.
Therefore, the base end of the block member is fixed to the side wall of the hand hole, the tip end is protruded from the side wall, and the tube end of the cable insertion tube through which the cable connecting the hand holes is inserted can be slid into the socket member. The end of the protective tube that surrounds the cable insertion tube and connects between the hand holes is held by the mounting portion, and the one cable insertion tube that is approached by the connection is received at the receiving portion formed in the socket member. The cable pipe is formed by connecting the protective pipes, which are finally connected by the exchange by the slide and connected by the slide on the outer periphery of the tip end portion of the block member, by the connection.
[0049]
In the cable pipe forming block body of the present invention, the socket member itself constituting the block body has a required length, and the portion protruding from the side wall of the hand hole of the block member is set to the required length. The cable insertion tube and the protection tube have a long insertion allowance, and the cable conduit formed using this block body exhibits an excellent effect in ground subsidence and earthquake resistance.
[0050]
Also, if the cable conduit is formed using the cable conduit forming block body of the present invention, the cable insertion tube that directly protects the cable is surrounded by the protective tube, so the cable can be protected twice. Of course, it can be used for the formation of pipelines for ordinary power cables and communication cables, and it can be used for the formation of pipelines for optical fiber cables in particular, and can greatly contribute to the formation of high safety and dense pipelines. It is.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an example of a block body for forming a cable conduit in the present invention.
FIG. 2 is a longitudinal sectional view of FIG.
FIG. 3 is a perspective view schematically showing an example of attachment to a hand hole.
FIG. 4 is an explanatory diagram showing steps of a cable conduit forming method using the cable conduit forming block body of the present invention.
FIG. 5 is also an explanatory view showing a state immediately after connection of pipe members.
FIG. 6 is an explanatory diagram when connection is completed.
FIG. 7 is a partially cutaway side view showing another example of the cable conduit forming block body according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,21 Cable pipe formation block body 2,22 Block member 2a Tip part 2b Base end part 3,23 Socket member 5,25 Receiving part 5a, 25a Mark line 8,28 Hand hole 10 Cable insertion pipe 11 Sleeve 12 Connection Pipe member 13 Protection tube

Claims (4)

A plurality of socket members having receiving portions that can be slid within a range in which the tube end portions of the cable insertion tube can be exchanged for connecting the tube end portions,
The tip portion for integrally connecting and holding the plurality of socket members is composed of a cylindrical block member,
The base end of the block member has a shape that matches the mounting hole formed in the side wall of the hand hole, and
A block body for forming a cable conduit characterized in that an outer peripheral surface of a cylindrical tip portion of a block member protruding from a side wall of the hand hole is a mounting portion for a protective tube covering all of the cable insertion tube. The socket member is
The front end of the receiving portion has a rubber ring holding portion for tightly holding the tube end portion of the received cable insertion tube, and the opening on the proximal end side facilitates cable insertion. The cable pipe-forming block body according to claim 1, further comprising a guide portion having an enlarged diameter. The socket member is
The cable conduit forming block according to claim 1 or 2, wherein the receiving portion has a concave mark for positioning a pipe end of the received cable insertion pipe. The protective tube covering the cable insertion tube is
It is a corrugated pipe | tube, The block body for cable pipe line formation in any one of Claims 1-3 characterized by the above-mentioned.

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