JP2003116209A - Multiple cable protective pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a space for custody small as compared with the case where protective pipes are wound one by one around a reel so as to be convenient for carriage, and to reduce labor in laying work by drawing out three pieces, for example, of protective pipes together prior to laying, and also to reduce the execution cost of works by making the sectional area of an excavated ditch for laying small. SOLUTION: The three pieces of protective pipes 12 can be wound in a lump around the reel and the three pieces of protective pipes wound around the reel can be drawn out together from the reel 12 prior to laying since the three pieces of protective pipes 12 are in contact with each other and are bound together, with each contact point becoming a fused part 14. The sectional area of the excavated groove for laying can be made small since the three pieces of protective pipes 12 are in contact with each other and are bound together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-strand cable protection tube, and more particularly to a multi-strand cable protection tube for protecting a cable such as a communication cable or a power cable.

[0002]

2. Description of the Related Art A conventional multi-strand cable protection tube of this type is shown in FIGS. In a multi-strand cable protection tube 1 shown in FIG. 18, six protection tubes 2 are arranged in parallel with each other, and adjacent ones are held by a nozzle 4 with a gap 3 therebetween. These six protection tubes 2 are arranged in the upper and the lower three, respectively. The nozzle base 4 is a rectangular plate-shaped body, and has six insertion holes formed therein, and the protection tube 2 is inserted into each insertion hole. A plurality of nozzles 4 are arranged at a predetermined pitch. The protection tube 2 is a corrugated tube made of synthetic resin. According to this multi-strand cable protection tube 1, since the six protection tubes 2 are held by the nozzle base 4, the protection tubes 2 do not vary,
It can be laid in a trench with a relatively narrow excavation cross section.

A multi-strand cable protection tube 5 shown in FIG. 19 is different from the multi-strand cable protection tube 1 shown in FIG. 18 in that a spacer 6 is mounted between the upper protection tube 2 and the lower protection tube 2 corresponding to each other. It is a thing. Since the spacer 6 has a shape for holding the upper and lower protection tubes 2,
The backfill can prevent it from meandering or bending.

The multi-strand cable protection tube 7 shown in FIG. 20 is formed by stacking a plurality of protection tubes 8 and the protection tubes 8 are separated from each other. The protection pipe 8 includes a large number of annular protrusions 8a and a large number of annular grooves 8 along the circumferential direction of the pipe wall.
b are formed, and these are arranged alternately in the axial direction. The cross-sectional shape of each of these ridges 8a orthogonal to the axial direction of the tube 8 is rectangular, and the cross-sectional shape of each groove 8b in the same direction is circular. In this way, since each ridge 8a has a rectangular cross-sectional shape, as shown in FIG. 20, a plurality of protective tubes 8 can be stacked and laid in a state where adjacent protective tubes 8 are in contact with each other. This allows the multi-strand cable protection tube 7 to be laid in a groove having a relatively narrow excavation cross-sectional area as shown in FIGS. 18 and 19.

[0005]

However, in the conventional multi-strand cable protection tube 1 shown in FIG. 18, since the gap 3 is formed between the protection tubes 2, the protection tube 2 is filled with earth and sand to be backfilled. There is a problem of bending and meandering. If the protection tube 2 bends or meanders, a cable (not shown) such as a communication cable may not be inserted.

A conventional multi-strand cable protection tube 5 shown in FIG.
Then, since each protection tube 2 is held by the spacer 6, it does not bend or meander due to backfilling earth and sand, but in addition to the protection tube 2, the excavation cross-sectional area of the groove for laying by the amount of the spacer 6 is provided. There is a problem that becomes large.

A conventional multi-strand cable protection tube 7 shown in FIG.
Then, since the protection tubes 8 are not coupled to each other, there is a problem that, for example, when the protection tubes 8 are wound around a reel, only one protection tube 8 can be wound around the reel. Two
This is because when the protective tubes 8 of more than two are wound around the reel, they are entangled with each other. Since only one protective tube 8 can be wound around the reel in this way, a large space is required to store the protective tube 8 and it is difficult to lay a plurality of protective tubes 8 at the same time. Since it is there, it takes a lot of time to lay it.

Therefore, the main object of the present invention is that the multi-strand cable protection tube can be wound around a reel, the excavation cross-sectional area of the laying groove can be small, and it can be bent by backfilling earth and sand. It is to provide a multi-strand cable protection tube that does not meander.

[0009]

SUMMARY OF THE INVENTION The present invention is a multi-strand cable protection tube in which adjacent protection tubes are in contact with each other and are bound in a multi-strand state.

[0010]

[Function] Since the protection tubes are bundled in a multi-threaded state, this multi-threaded protection tube can be wound around the reel all at once, and the multi-threaded protection tube wound around this reel can be pulled out from the reel together. Can be laid. Since the adjacent protection tubes are in contact with each other and are bound in a multi-row condition, the excavation cross-sectional area of the laying groove is small, and there is no bending or meandering due to backfilling earth and sand. .

The multi-row protective tubes can be bound by fixing adjacent protective tubes to each other or by fixing adjacent protective tubes via a film. The multiple protection tubes can be bound by fixing the protection tubes to the core material or by knitting a plurality of protection tubes with, for example, a braid.

[0012] Further, assuming that a multi-row protective tube bundled in a state where adjacent ones are in contact with each other is arranged in the outer tube, since the multi-row protective tube is bound, it is inserted into the outer tube. It is easy to do, and each protection tube can be protected by the outer tube.

[0013]

According to the present invention, since the bundled multi-row protection tubes can be wound around a winding tool such as a reel, as compared with the case where a long protection tube is wound around the reel one by one. It has a small storage space and is convenient for transportation. When laying the multi-strand cable protection pipe, since the multi-strand protection pipes are bundled, the multi-strand protection pipes can be laid simultaneously in this state, thereby reducing the labor of the laying work.

Since the protection tubes adjacent to each other are bound together in a state of being in contact with each other, the excavation cross-sectional area of the laying groove can be small, whereby the construction cost can be reduced. In addition, since the protective tube does not bend or meander after the construction due to backfilling with sand, damage to the communication cable or the like inserted through the protective tube can be prevented. Further, since the multiple protection tubes can be laid in a bound state, the strength can be improved by the number of the protection tubes.

Further, if a multi-row protective tube which is bound in a state where adjacent ones are in contact with each other is arranged in the outer tube, since the protective tube is bound, it can be easily inserted into the outer tube. Therefore, the construction cost is low. Further, since each protection tube can be protected by the outer tube, it is possible to strengthen protection of the communication cable and the like inserted in the protection tube.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments made with reference to the drawings.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-strand cable protection tube 10 according to a first embodiment of the present invention shown in FIG. 1 has a plurality of, for example, three protection tubes 12 bound together and inserted into each protection tube 12. It is for protecting a cable (not shown) such as a communication cable or an electric power cable, and the communication cable or the like is inserted into each protection tube 12 in a state of being buried in the ground as in the conventional case. is there.

Each of the three protective tubes 12 is a cylindrical tube (straight tube) made of synthetic resin such as polyethylene.
However, as shown in FIG. 1, each is formed to have the same outer diameter and thickness. The three protective tubes 12 are arranged with their respective axial centers located at the vertices of an equilateral triangle. In the laid condition, Fig. 1 (B)
As shown in FIG. 2, two protective tubes 12 are arranged in the lower stage and one protective tube 12 is arranged in the upper stage. In addition, each protection tube 12
Are circumscribed with each other and are fused to each other at these three circumscribed portions. Reference numeral 14 shown in FIG. 1 is a fusion-bonded portion. The fused portion 14 is continuously formed along the axial direction of the protective tube 12. Of course, the fused portions 14 may be formed at a predetermined pitch.

According to the multi-strand cable protection tube 10 shown in FIG. 1, since three protection tubes 12 are bound together, the three protection tubes 12 are bundled together and wrapped around a winding tool (not shown) such as a reel. It can be wound, and the three protection tubes 12 wound around the reel can be used together by pulling out from the reel. That is, compared to the case where the long protective tube 12 is wound around the reels one by one, the storage space is small and the volume is small, which is convenient for transportation to the construction site.

When the multi-strand cable protection tube 10 is laid, for example, the long multi-strand cable protection tube 10 wound around a reel is pulled out from the reel and the three protection tubes 12 are bound together. Can be laid at the same time. Therefore, as compared with the case where the protection tubes 12 are laid one by one, the labor of the laying work can be reduced and the construction period can be shortened. Thereafter, a cable such as a communication cable is inserted into each protection tube 12. This completes the laying work.

Further, since the adjacent protection tubes 12 are bound in a state of being in contact with each other, the excavation cross-sectional area of the groove for laying the multi-strand cable protection tube 10 can be small, and the construction cost can be reduced. be able to. Furthermore, since the protection tubes 12 do not bend or meander due to backfilling earth and sand after the construction, it is possible to prevent damage to the communication cables and the like inserted through the protection tubes 12. Since the three protection tubes 12 can be laid in a bound state, the strength can be improved by the number of the protection tubes 12.

Next, with reference to FIG. 2 and FIG. 3, the multi-strand cable protection tube 16 of the second embodiment will be described. The difference between the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2 is that, in the first embodiment, adjacent protection tubes 12 are directly circumscribed and fused, thereby binding. On the other hand, in the second embodiment, the adjacent protective tubes 12 are connected to the film 18
It is in the state of being circumscribed via the adhesive and is bound by this. Since the other parts are the same as those in the first embodiment, the same parts are designated by the same reference numerals and their detailed description will be omitted.

The film 18 is mounted between the protective tubes 12 as shown in FIGS.
A sheet of film 18 is used. Each of the three films 18 is made of, for example, a synthetic resin such as polyethylene, is a strip having a length corresponding to the length of the protective tube 12, and is formed to have a predetermined width. Three films 18
The one edges are joined together. 2 and 3, the thickness of the film 18 is exaggeratedly drawn.

When manufacturing the multi-strand cable protection tube 16 shown in FIG. 2, for example, three extruded protection tubes 12 are cooled to room temperature. Then, as shown in FIG. 2, a film 18 having a surface having a melting point or a softening point, or a high temperature close to the melting point or the softening point is mounted between adjacent ones of the three cooled protective tubes 12, 1
8 is strongly sandwiched by the protective tube 12. At this time, the surface of the film 18 adheres to the surface of the protective tube 12 and the three protective tubes 12 are fixed to each other. Reference numeral 20 shown in FIG. 2 is a fixing portion.

As described above, the film 18 can fix the protective tubes 12 to each other by performing the same function as the adhesive. Therefore, as compared with the first embodiment in which the protection tubes 12 are fused by the fusion-bonding portion 14, the protection tubes 12 are fixed to each other in the second embodiment in which the protection tubes 12 are bonded to each other via the film 18. The strength can be reduced. As a result, the work of connecting the ends of the protective tube 12 can be easily performed. In other words, when connecting the ends of the two protective tubes 12, it is necessary to separate the fixed state of each end of the three protective tubes 12, but this disconnection work is performed by reducing the fixing strength. Can be done easily. However, film 18
The fixing strength through the cable is such that the protection tubes 12 are not adhered (adhered) to each other when the multi-strand cable protection tube 16 is wound around a reel or laid out by pulling out from the reel. Other than this, the multi-strand cable protection tube 10 of the first embodiment can be laid in the same manner and operates in the same manner, so detailed description thereof will be omitted.

Next, the multi-strand cable protection tube 22 of the third embodiment will be described with reference to FIG. The difference between the first embodiment shown in FIG. 1 and the third embodiment shown in FIG. 4 is that in the first embodiment, adjacent protection tubes 12 parallel to each other are directly circumscribed and fused, In the third embodiment, the three protection tubes 12 are braided, and the three protection tubes 12 are braided by braiding.
I have just united. The three braided protective tubes 12 are in contact with each other, but are not fused or bonded. In FIG. 4, the pitch of the braid is drawn shorter to make it easier to understand the state of the braid, but the actual pitch may be longer than this.

However, the three protective tubes 12 may be fused or adhered to each other. The rigidity of the protective tube 12 can be increased by fusing or adhering. Since the other parts are the same as those in the first embodiment, the same parts are designated by the same reference numerals and their detailed description will be omitted. The multi-strand cable protection tube 22 can be laid in the same manner as the multi-strand cable protection tube 10 of the first embodiment and operates in the same manner, so detailed description thereof will be omitted.

Next, the multi-strand cable protection tube 24 of the fourth embodiment will be described with reference to FIG. The difference between the first embodiment shown in FIG. 1 and the fourth embodiment shown in FIG. 5 is that in the first embodiment, each of the three protective tubes 12 is a cylindrical tube, whereas in the fourth embodiment An example is where each of the three protective tubes 26 is a corrugated tube. This corrugated tube 26 is equivalent to the conventional one, has a substantially constant thickness, and has a large number of annular projections 28 and a large number of annular grooves 30 formed along the circumferential direction of the outer surface. These are arranged alternately in the axial direction. Similarly, a large number of annular ridges and a large number of annular grooves are formed along the circumferential direction of the inner surface, and these are arranged alternately in the axial direction. The material of this protection tube 26 is the first
It is equivalent to the embodiment, and is, for example, a synthetic resin such as polyethylene.

As shown in FIG. 5, annular protrusions 28 formed on the respective tube walls of the three protective tubes 26 are in contact with each other, and the contact portions are fused to each other. There is. By this fusion, the three protective tubes 26 are bound together. Reference numeral 32 shown in FIG. 5 is a fusion bonding portion. Other than this, the first
The configuration is equivalent to that of the embodiment, and detailed description thereof is omitted.

According to this multi-strand cable protection tube 24, since each protection tube 26 is a corrugated tube, it is easier to bend than the case where the protection tube 12 is a cylindrical tube as in the first embodiment. It becomes compact when wound around a reel or the like, and the radius of curvature of the bent portion during installation can be reduced. Except for this, the multi-strand cable protection tube 10 of the first embodiment can be installed in the same manner and operates in the same manner, so detailed description thereof will be omitted.

Next, the multi-strand cable protection tube 34 of the fifth embodiment will be described with reference to FIG. The difference between the fifth embodiment shown in FIG. 6 and the second embodiment shown in FIG.
In the embodiment, each of the three protection tubes 12 is a cylindrical tube, whereas in the fifth embodiment, each of the three protection tubes 26 is a corrugated tube. This corrugated tube 26 is equivalent to that of the fourth embodiment shown in FIG. 5 and operates in the same manner, so detailed description will be omitted.

As shown in FIG. 6, these three protective tubes 26 are bonded to each other in a state where the annular projections 28 formed on the respective tube walls are circumscribed via the film 18, and Are united by. This film 18
It is the same as the film 18 of the second embodiment, and like the second embodiment, the protective tubes 26 are bonded to each other via the film 18. In FIG. 6, the thickness of the film 18 is exaggerated.

The multi-strand cable protection tube 34 shown in FIG. 6 can be manufactured in the same manner as in the second embodiment, and the film 18 reduces the fixing strength between the protection tubes 26 as in the second embodiment. However, detailed description thereof will be omitted. Reference numeral 36 shown in FIG. 6 is a fixing portion. The multi-strand cable protection tube 34 can be laid in the same manner as the multi-strand cable protection tube 16 of the second embodiment,
Since they operate in the same manner, detailed description thereof will be omitted.

Next, the multi-strand cable protection tube (not shown) of the sixth embodiment will be described. Third embodiment and sixth shown in FIG.
The third embodiment differs from the third embodiment in that each of the three protection tubes 12 is a cylindrical tube, whereas the sixth embodiment has three protection tubes (not shown). It is a corrugated tube. This corrugated tube is equivalent to the protection tube 26 of the fourth embodiment shown in FIG. 5 and operates in the same manner, so detailed description will be omitted.

Three protective tubes of this embodiment (corrugated tubes)
Is braided in the same manner as the third embodiment shown in FIG. 4, and three protective tubes are bound by the braid. The three braided protective tubes have their ridges in contact with each other, but are not fused or bonded.

The three protective tubes may be fused or adhered to each other. The rigidity of the protective tube can be increased by fusing or adhering. Since the other points are the same as those in the third embodiment, detailed description thereof will be omitted. This multi-strand cable protection pipe can be laid similarly to the multi-strand cable protection pipe 22 of the third embodiment, and since it operates in the same manner, detailed description thereof will be omitted.

Next, with reference to FIG. 7 and FIG. 8, the multi-strand cable protection tube 52 of the seventh embodiment will be explained. The difference between the first embodiment shown in FIG. 1 and the seventh embodiment shown in FIG. 7 is that, in the first embodiment, adjacent protective tubes 12 are circumscribed and fused to each other so that they are bound together. On the other hand, in the seventh embodiment, the protective tubes 12 are fixed to one core member 54 and are bound together. Since the other parts are the same as those in the first embodiment, the same parts are designated by the same reference numerals and their detailed description will be omitted.

As shown in FIGS. 7 and 8, the core member 54 is arranged in a space 56 formed by being surrounded by three protective tubes 12, and a total of three band-shaped members 54a are connected to each other. Is. The three strips 54a are made of a synthetic resin such as polyethylene and have the same shape and size. Each strip 54a is a protective tube 1
It has a length corresponding to the length of 2 and has a predetermined width. Each of the strip-shaped bodies 54a has its one edge portion coupled to each other, and the other edge portion thereof is fixed (bonded) to the outer surface of the corresponding protection tube 12. The core member 54 is arranged at the center of the space 56, and the three strips 54a are arranged at intervals of about 120 ° around the joint portion 54b where they are joined.
The three protective tubes 12 that circumscribe each other are in contact with each other at their respective circumscribed portions without being fixed to each other. Further, in FIG. 8, the thickness of each strip 54 a of the core material 54 is exaggeratedly drawn.

When the multi-strand cable protection tube 52 shown in FIG. 7 is manufactured, for example, three extruded protection tubes 12 are cooled to room temperature. Then, a core material 54 is mounted in a space 56 formed by being surrounded by the three cooled protection tubes 12, and the core material 54 is strongly sandwiched by the three protection tubes 12. At this time, the edges of the three strips 54a are in a state of high temperature close to or near the melting point or the softening point, whereby the edges of the strips 54a of the core material 54 are brought to the surface of each protection tube 12. As a result, the three protective tubes 12 are fixed to the core member 54. In this way, the three protective tubes 12 are bound together in a state where they are in contact (outside contact) with each other. Reference numeral 58 shown in FIG. 7 is a fixing portion. The fixing portion 58 is continuously formed along the axial direction of the protective tube 12 as in the first embodiment and the like. Of course, the fixing portions 58 may be formed at a predetermined pitch.

As described above, the three protective tubes 12 are bound together by being fixed to the strips 54a corresponding to the cores 54, respectively. When connecting the multi-strand cable protection tubes 52 of this embodiment, each of the three protection tubes 12 is connected.
There is a method of disconnecting one protective tube 12 from the remaining two protective tubes 12 for that purpose. As this method, by pulling the end portion of the protective tube 12 in a direction in which the protective tube 12 is separated from the other protective tube 12, a method for peeling off one fixing portion 58 for fixing the protective tube 12 and one strip 54a, and This one strip 5
There is a method of tearing 4a. As a result, the protective tube 12
The end of the can be easily separated from the other two protective tubes 12. On the other hand, in the first embodiment shown in FIG.
First, when separating one protection tube 12 from the other two protection tubes 12, the two fusion-bonding portions 14 for fusing this protection tube 12 and each of the two protection tubes 12 adjacent thereto are provided. It needs to be separated. Therefore, the binding strength of the protection tube 12 can be reduced in the seventh embodiment as compared with the first embodiment. As a result, the work of cutting off the end of each protection tube 12 can be easily performed, and the surface of the protection tube 12 can be prevented from being damaged by the cutting.

In short, in the seventh embodiment, even when the number of the protection tubes 12 is a large number, for example, four or more, when each protection tube 12 is separated from the other protection tubes 12, for example, the protection tubes 12 are separated. Since it is only necessary to separate the one fixing portion 58 that fixes the strip-shaped body 54a to the strip-shaped body 54a, the work of separating the protective tubes 12 can be easily performed. Therefore, it is possible to easily perform the connecting work of the ends of the multi-row protection tube 12.

Further, as shown in FIG.
Is fixed to the edge of the strip 54a of the core member 54, so that the adhesive width of the strip 54a to the protective tube 12 can be changed by changing the thickness of the strip 54a. As a result, the binding force between the two can be set to a desired value.

However, the coupling force (fixing strength) between the protective tube 12 and the core material 54 is such that when the multi-strand cable protective tube 52 is wound around a reel or is pulled out from the reel and laid, The strength is such that the adhesion (adhesion) with the material 54 does not come off and the core material 54 does not break. Other than this, the multi-strand cable protection tube 10 of the first embodiment can be laid in the same manner and operates in the same manner, so detailed description thereof will be omitted.

Next, with reference to FIG. 9, a multi-strand cable protection tube 60 of the eighth embodiment will be described. The difference between the seventh embodiment shown in FIG. 7 and the eighth embodiment shown in FIG. 9 is that in the seventh embodiment, the core member 54 is formed of three strips 54a, whereas in the eighth embodiment. In the example, the core material 62 is in a cylindrical shape. Other than this, since it is equivalent to the seventh embodiment,
The same parts are designated by the same reference numerals and detailed description thereof will be omitted.

The multi-strand cable protection tube 60 of this embodiment is
As shown in FIG. 9, since the cylindrical core material 62 is used, even if the core material 62 is twisted relative to the protective tube 12 during manufacturing, the core material 62 and the outer surface of the core material 62 are Each protection tube 1
The outer surface of 2 can be reliably adhered (fixed).
As a result, it is possible to reduce variations in the quality of the bonded state between the three protective tubes 12 and the core material 62.

When the multi-strand cable protection tube 60 of this embodiment shown in FIG. 9 is manufactured, for example, the three protection tubes 12 extruded are cooled to room temperature, as in the seventh embodiment. Then, the core material 62 is mounted in the space 56 formed by being surrounded by the three protection tubes 12 that have been cooled, and the core material 62 is strongly sandwiched by the three protection tubes 12. At this time, the outer peripheral surface of the core material 62 is in a state of a melting point or a softening point, or a high temperature close to it, so that the outer surface of the core material 62 is adhered to the outer surface of each protective tube 12, and each of the three cores is bonded. The protection tube 12 is fixed to the core material 62. In this way, the three protective tubes 12 are bound together in a state where they are in contact (outside contact) with each other. Reference numeral 64 shown in FIG. 9 is a fixing portion. The fixing portions 64 may be formed continuously along the axial direction of the protection tube 12 or may be formed at a predetermined pitch.

The multi-strand cable protection tube 60 of the eighth embodiment
According to this, as in the seventh embodiment, the three protection tubes 12 are bound together by being fixed to the core material 62. Therefore, in order to separate the ends of the three protection tubes 12, first, the protection tube 12 is separated from the remaining two protection tubes 12 in the same manner as in the seventh embodiment. That is,
By pulling the end portion of the one protection tube 12 in a direction in which the protection tube 12 is separated from the other protection tube 12, one fixing portion 64 for fixing the protection tube 12 and the core material 62 is peeled off, or
Alternatively, the cylindrical core material 62 may be torn. As a result, the end of one protection tube 12 can be easily separated from the other two protection tubes 12. Thus, in the multi-strand cable protection tube 60 of the eighth embodiment, the binding strength of the protection tube 12 can be made smaller than that of the first embodiment shown in FIG. 1 for the same reason as in the seventh embodiment. as a result,
It is possible to easily perform the work of cutting off the end of each protection tube 12, and it is possible to prevent the surface of the protection tube 12 from being damaged by the cutting. Therefore, it is possible to easily carry out the work of connecting these multi-row protection tubes 12.

However, the fixing strength between the protective tube 12 and the core material 62 is the same as in the seventh embodiment.
The strength is set so that the protection tube 12 and the core material 62 are not fixedly adhered (bonded) to each other when 0 is wound around the reel or laid. Other than this, the multi-strand cable protection tube 5 of the seventh embodiment
Since it can be laid in the same manner as in No. 2 and operates in the same manner, detailed description thereof will be omitted.

Next, referring to FIG. 10, the multi-strand cable protection tube 66 of the ninth embodiment will be described. The difference between the eighth embodiment shown in FIG. 9 and the ninth embodiment shown in FIG.
In the embodiment, the core material 62 has a cylindrical shape.
In the embodiment, the core material 68 has a cylindrical shape. Except for this, the present embodiment is the same as the eighth embodiment, and therefore the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

The multi-strand cable protection tube 66 of this embodiment is
As shown in FIG. 10, since the cylindrical core material 68 is used, it is possible to reduce the amount of deformation of the core material 68 when the temperature is high during manufacturing. As a result, the three protective tubes 12 can be reliably bonded to the outer surface of the core material 68, and variations in the quality of the bonded state can be reduced. That is, when manufacturing the multi-strand cable protection tube 66, for example, the core material 68 is mounted in the space 56 formed by being surrounded by the three protection tubes 12 formed by extrusion and the core material 68 is attached. It is strongly sandwiched by the three protective tubes 12. At this time, the outer peripheral surface of the core material 68 has a melting point or a softening point,
Or it is in a high temperature state close to it, but the core material 68
The cylindrical shape makes it possible to reduce the amount of deformation of the core material 68 at this time, whereby the outer surface of the core material 68 can be reliably pressed and bonded to the outer surface of each protective tube 12. Other than this, the multi-strand cable protection tube 60 of the eighth embodiment can be manufactured and laid similarly to the multi-strand cable protection tube 60, and since the same operation is performed, detailed description thereof will be omitted.

Next, referring to FIG. 11, the multi-strand cable protection tube 72 of the tenth embodiment will be described. The difference between the tenth embodiment shown in FIG. 11 and the seventh embodiment shown in FIG. 7 is that in the seventh embodiment, each of the three protective tubes 12 is a cylindrical tube. In the embodiment, each of the three protection tubes 26 is a corrugated tube. This corrugated tube 26 is equivalent to that of the fourth embodiment shown in FIG. 5 and operates in the same manner, so detailed description will be omitted.

As shown in FIG. 11, in each of the three protective tubes 26, the annular protrusions 28 formed on the respective tube walls correspond to the cores 54 and the strips 54a.
It adheres to the edge of the and is bound by this. Reference numeral 74 shown in FIG. 11 is a fixing portion. The core material 54 is the same as the core material 54 of the seventh embodiment.

The multi-strand cable protection tube 72 shown in FIG.
It can be manufactured in the same manner as in the seventh embodiment.
Similar to the embodiment, since the binding force between the protection tubes 26 can be made smaller than that in the first embodiment, detailed description thereof will be omitted. Also, this multi-strand cable protection tube 72
Can be laid similarly to the multi-strand cable protection tube 52 of the seventh embodiment, and operates in the same manner, so detailed description thereof will be omitted.

Next, the multi-strand cable protection tube (not shown) of the eleventh embodiment will be described. The difference between the eleventh embodiment and the eighth embodiment shown in FIG. 9 is that in the eighth embodiment,
While each of the three protection tubes 12 is a cylindrical tube,
In the embodiment, each of the three protection tubes 26 is a corrugated tube. This corrugated tube 26 is equivalent to that of the fourth embodiment shown in FIG. 5 and operates in the same manner, so detailed description will be omitted.

Each of these three protective tubes 26 is formed by fixing the annular projections 28 formed on the respective tube walls to the outer surface of the cylindrical core member 62, thereby binding them together. The core material 62 is the same as the core material 62 of the eighth embodiment.

The multi-strand cable protection tube of the 11th embodiment can be manufactured in the same manner as the 8th embodiment.
Similar to the eighth embodiment, the binding force between the protective tubes 26 is set to the first value.
Since the size can be made smaller than that of the embodiment, detailed description thereof will be omitted. Further, this multi-strand cable protection tube can be laid similarly to the multi-strand cable protection tube 60 of the eighth embodiment, and since it operates in the same manner, detailed description thereof will be omitted.

Next explained is the multi-strand cable protection tube (not shown) of the twelfth embodiment. The difference between this twelfth embodiment and the ninth embodiment shown in FIG. 10 is that in the ninth embodiment, each of the three protective tubes 12 is a cylindrical tube, whereas in the twelfth embodiment, This is where each of the three protection tubes 26 is a corrugated tube. This corrugated tube 26 is equivalent to that of the fourth embodiment shown in FIG. 5 and operates in the same manner, so detailed description will be omitted.

Each of the three protective tubes 26 is formed by fixing the annular projections 28 formed on the respective tube walls to the outer surface of the columnar core material 68 and binding them. The core material 68 is the same as the core material 68 of the ninth embodiment.

The multi-strand cable protection tube of the twelfth embodiment can be manufactured in the same manner as in the ninth embodiment, and as in the ninth embodiment, the binding force between the protection tubes 26 is set in the first embodiment. Since they can be smaller than the above, detailed description thereof will be omitted. In addition, this multi-strand cable protection tube
It can be laid similarly to the multi-strand cable protection tube 66 of the embodiment, and since it operates in the same manner, detailed description thereof will be omitted.

However, in each of the first to twelfth embodiments, the number of the protective tubes 12 or 26 is three, but it may be two or four or more. When the number of the protective tubes is four or more in the third and sixth embodiments, the plurality of protective tubes are knitted together by knitting like four braiding. Of course, any method can be used for knitting the protective tube.
It is only necessary that the protection tubes adjacent to each other can be bound in a state of being in contact with each other and a communication cable or the like can be inserted into the protection tube. As a method of knitting two protective tubes, for example, two protective tubes may be twisted. However, in order to prevent the twist from returning, each protective tube is twisted in the opposite direction to the twist. It is good to put it. Further, in the seventh to twelfth embodiments, when the number of the protective tubes is two, the two protective tubes may be fixed to the core material while being in contact with each other.

FIG. 12 shows an example in which six protective tubes 12 are fused and bound together. That is, in the first embodiment, as shown in FIG.
As shown in Fig. 3, the three protective tubes 12 are fused and bound,
Instead of this, as shown in FIG.
May be fused and bound. In the multi-strand cable protection tube 38 shown in FIG. 12, three protection tubes 12 are horizontally arranged in three rows in the lower stage, and adjacent ones are fused in a state of being in contact with each other. Also in the upper stage, three protection tubes 12 are horizontally arranged in three rows, and adjacent ones are fused so that they are in contact with each other. The three lower protection tubes 12 and the upper protection tubes 12 corresponding to the lower protection tubes 12 are fused together in contact with each other.
Reference numeral 14 shown in FIG. 12 is a fused portion.

FIG. 13A or FIG. 13B shows an example in which four or five protective tubes 12 are fixed and bound together. That is, in the second embodiment, as shown in FIG. 2, the three protective tubes 12 are adhered and bound together through the film 18, but instead of this, the protective tube 12 shown in FIG. 13 (A) or FIG. 13 (B) is used. As shown, attach four or five protective tubes 12 to the film 1
You may adhere | attach and bind together via 8. The film 18 functions as an adhesive. The multi-section cable protection tube 41 or 40 shown in FIG. 13 (A) or FIG. 13 (B)
Are arranged such that the respective axes of the four or five protective tubes 12 are located at the vertices of a square or a regular pentagon. The film 18 is mounted between the protective tubes 12, and a total of 4 or 5 films 18 are used. In FIG. 13, the thickness of the film 18 is exaggerated.

FIG. 14 (A) or FIG. 14 (B) shows an example in which four or five protective tubes 12 are fixed to the core material 76 or 78 and bound together. That is, in the seventh embodiment shown in FIG. 7, the three protective tubes 12 constitute the core member 54.
The strip-shaped members 54a are bonded and bound to the edge portions thereof, but instead of this, as shown in FIG. 14 (A) or FIG. 14 (B), four or five protective tubes 12 are used as core materials. 76 or 7
Four or five strips 76a or 7 constituting 8
You may adhere | attach and bind to the edge part of 8a. The core material 76 or 78 itself functions as an adhesive. This FIG.
Multi-strand cable protection tube 8 shown in (A) or FIG. 14 (B)
0 or 82 is arranged in a state in which the respective axes of the four or five protection tubes 12 are located at the vertices of a square or a regular pentagon. The protective tubes 12 are in contact with each other at their circumscribed portions in a state where they are not fixed to each other. The core material 76 or 78 has four or five strips 7.
6a or 78a are bound to each other. Each strip 76a or 78a has a coupling portion 76 to which they are coupled.
They are arranged about 90 ° or about 72 ° about b or 78b. In FIG. 14, the core members 76 and 78
The thickness of each strip 76a and 78a is exaggerated.

In FIG. 15 (A) or FIG. 15 (B), four or five protection tubes 12 are connected to a cylindrical core member 84 or 86.
An example is shown in which the sheets are fixed and bound to. In the eighth embodiment shown in FIG. 9, each of the three protective tubes 12 is bonded to the outer surface of the cylindrical core material 62 and bound, but instead of this, FIG.
Alternatively, as shown in FIG. 15B, four or five protection tubes 12 may be bonded to the outer surface of the core material 84 or 86 to be bound. The core material 84 or 86 itself functions as an adhesive. The multi-strand cable protection tubes 88 or 90 shown in FIG. 15 (A) or FIG. 15 (B) are arranged in a state in which the axis of each of the four or five protection tubes 12 is located at the apex of a square or regular pentagon. Has been done. And
The protective tubes 12 are in contact with each other at their outer contact portions in a state where they are not fixed to each other. The core materials 84 and 86 are equivalent to the core material 62 of the eighth embodiment shown in FIG. 9, but are formed to have an outer diameter larger than that.

In FIG. 16 (A) or 16 (B), four or five protective tubes 12 are connected to a cylindrical core material 92 or 94.
An example is shown in which the sheets are fixed and bound to. 9th shown in FIG.
In the embodiment, the three protection tubes 12 are bonded to the outer surface of the cylindrical core material 68 and bound, but instead of this, as shown in FIG.
As shown in (A) or FIG. 16 (B), four or five
Each protection tube 12 of the book may be bonded to the outer surface of the core material 92 or 94 by binding. The core material 92 or 94 itself functions as an adhesive. FIG. 16A or FIG.
The multi-strand cable protection tube 96 or 98 shown in FIG.
The four or five protective tubes 12 are arranged such that their respective axes are located at the vertices of a square or a regular pentagon.
The protective tubes 12 are in contact with each other at their circumscribed portions in a state where they are not fixed to each other. Core materials 92 and 9
No. 4 is equivalent to the core material 68 of the ninth embodiment shown in FIG. 10, but has an outer diameter larger than that.

In each of the first to twelfth embodiments,
The multi-strand cable protection tube 10 or the like formed by binding the protection tubes 12 or 26 was directly buried in the ground, but instead of this,
As shown in FIG. 17, the multi-strand cable protection tube 10 is connected to the outer tube 4
It may be placed in the inside of 2 and buried in the ground in this state. The multi-strand cable protection tube 44 shown in FIG. 17 is the first one shown in FIG.
An example in which the multi-strand cable protection tube 10 of the embodiment is housed in the outer tube 42 is shown. However, instead of the multi-strand cable protection pipe 10 of the first embodiment, the multi-strand cable protection pipe of any one of the second to twelfth embodiments may be housed in the outer pipe 42.

The outer tube 42 is a corrugated tube made of synthetic resin such as polyethylene, and has a size capable of accommodating three or more protective tubes 12 in view of its size.
That is, in the inner space of the outer pipe 42, a space portion other than the space occupied by the three protection pipes (existing protection pipes) 12 is formed as the additional pipe space 46. About seven or more new protective tubes 48 can be accommodated in the additional tube space 46. FIG. 17 shows a state in which three new protection tubes 48 shown by a chain double-dashed line are inserted. In addition, of the three existing protection tubes 12 that are fused to each other, two existing protection tubes 12
Is fused to the inner surface of the outer tube 42. Reference numeral 50 shown in FIG. 17 is a fusion-bonded portion. The fused portion 50 is formed along the axial direction of the outer tube 42. In this way, since the existing protection tube 12 is fused to the outer tube 42 and both are integrated, even if the existing protection tube 12 and the outer tube 42 expand or contract due to temperature change,
It is possible to prevent a difference in length between the two.
Although the two existing protection tubes 12 are fused to the inner surface of the outer tube 42, they may not be fused to the inner surface of the outer tube 42.

The multi-strand cable protection tube 44 shown in FIG.
The three protection tubes 12 which are bound by fusion in a state of being in contact with each other are arranged in the outer tube 42.
Since the two are bundled, they can be easily inserted into the outer tube 42, which reduces the construction cost. Since the three protective tubes 12 are bound together, they are not twisted when inserted into the outer tube 42 and do not become disordered with each other, so that the inner space of the outer tube 42 is not blocked, and therefore, It is possible to secure the additional pipe space 46. That is, in the outer tube 42, the initially required number (for example, 3
The protective pipe (existing protective pipe) 12 of this book is provided, but the protective pipe (new protective pipe) 48 required in the future does not have to be provided at the time of the initial construction, and when it is needed in the future. Can be expanded. As a result, it is possible to reduce the construction cost required at the beginning of the multi-strand cable protection tube 44. Further, since the outer pipe 42 is provided, the three existing protection pipes 12 and the new protection pipe 48 to be added can be protected by the outer pipe 42, and thus the protection pipes 12 and 48 are inserted. It is possible to enhance the protection of the communication cable (not shown) and the like.

In the multi-strand cable protection tube 44 shown in FIG. 17, the three protection tubes 12 are arranged inside the outer tube 42 as existing protection tubes, but other number of protection tubes 12 are provided as existing protection tubes. You may arrange as. Of course, the number is such that the additional pipe space 46 can be secured. In addition, additional space 4
Although the number of the new protective tubes 48 that can be inserted in 6 is about 7 or more, other numbers may be used.

In each of the first to twelfth embodiments,
Although the outer diameters of the protection tubes 12 and 26 are the same, the outer diameters may be different.

Furthermore, in the first and fourth embodiments, the protective tubes 12 are fused and bound together, but instead of this, the protective tubes 12 may be bound together by an adhesive.

Although the outer pipe 42 shown in FIG. 17 is a corrugated pipe, it may be a cylindrical pipe instead.

The second and fifth embodiments using the film 18 (see FIGS. 2 and 6) and the core 5
When the material of the protective tubes 12, 26 of the seventh to twelfth embodiments (see FIGS. 7 to 11) using 4, 62, 68, ... Is high density polyethylene, for example, the film 18 and the core are used. The material of the materials 54, 62, 68, ... Is preferably low density polyethylene rather than high density polyethylene. This is because when the material of the film 18, the core material 54 and the like is made of the same high density polyethylene as the material of the protective tube 12 and the like, the bonding force between the two may become too large. Therefore, in order to make this bonding force smaller than that, it is preferable that the material of the film 18, the core material 54 and the like be low density polyethylene different from the material of the protective tube 12 and the like. As a result, the protective tubes 12 and the like that are fixed via the film 18 are separated from each other, and the protective tube 1
It is possible to easily separate the second member and the like from the core member 54 and the like by pulling them with an appropriate force by hand, and it is possible to prevent the surface of the protective tube 12 and the like from being damaged by this separation. When the protective tubes 12 and 26 are made of synthetic resin other than polyethylene, they are protected when they are wound around the reel or laid out from the reel, as in the above embodiments. Tube 1
It is possible to prevent the protection tube 12 and the like from being separated by removing the fixing portion 58 or the like that binds the two and the like together,
The materials of the film 18 and the core member 54 may be determined so that the end portions of the film 18 and the like can be relatively easily separated by pulling them in the direction of separating them from each other by hand.

The film 18, the strips 54a of the core members 54, ... And the cylindrical core members 62, ... are preferably thinner than the protective tubes 12, 26. That is, when the average thickness of the protective tubes 12 and 26 of each example is 1.5 mm, for example, the second and fifth
The thickness of the film 18 of the embodiment, the thickness of each strip 54a of the core material 54 of the seventh and tenth embodiments, and the thickness of the cylindrical core material 62 of the eighth and eleventh embodiments are 1 respectively.
It is good to set it to mm or less. In this way, by making the thickness of the film 18 and the core material 62 thinner than the thickness of the protection tube 12 or the like, the end portions of the protection tube 12 or the like can be easily pulled by hand without damaging the surfaces thereof. Can be separated. As a result, it is possible to easily perform the connecting work between the ends of the multi-strand cable protection tube.

[Brief description of drawings]

FIG. 1A is a partial cross-sectional view showing the internal structure of the multi-strand cable protection tube of the first embodiment of the present invention as viewed from the IA-IA direction in FIG. 1B, and FIG. It is a longitudinal cross-sectional view orthogonal to the axial direction of the multi-strand cable protection tube shown in FIG.

FIG. 2A is a partial cross-sectional view showing the internal structure of the multi-strand cable protection tube of the second embodiment of the present invention as viewed from the direction IIA-IIA in FIG. 2B, and FIG. It is a longitudinal cross-sectional view orthogonal to the axial direction of the multi-section cable protection tube shown in FIG.

FIG. 3 is a perspective view showing a film provided in the second embodiment of FIG.

4A is a front view showing a multi-strand cable protection tube of a third embodiment of the present invention, and FIG. 4B is an end view orthogonal to the axial direction of the multi-strand cable protection tube shown in FIG. 4A. Is.

5A is a partial cross-sectional view showing the internal structure of the multi-strand cable protection tube of the fourth embodiment of the present invention viewed from the VA-VA direction in FIG. 4B, and FIG. It is a longitudinal cross-sectional view orthogonal to the axial direction of the multi-strand cable protection tube shown in FIG.

6 (A) is a partial cross-sectional view showing the internal structure of the multi-strand cable protection tube of the fifth embodiment of the present invention as seen from the direction VIA-VIA in FIG. 6 (B), and FIG. It is a longitudinal cross-sectional view orthogonal to the axial direction of the multi-strand cable protection tube shown in FIG.

7A is a partial cross-sectional view showing the internal structure of the multi-strand cable protection tube according to the seventh embodiment of the present invention as viewed from the VIIA-VIIA direction in FIG. 7B, and FIG. 7 (A)
FIG. 3 is a vertical cross-sectional view orthogonal to the axial direction of the multi-section cable protection tube shown in FIG.

8A is a perspective view showing a core material provided in a seventh embodiment of FIG. 7, and FIG. 8B is a vertical cross-sectional view orthogonal to the axial direction of the core material shown in FIG. 8A. is there.

FIG. 9 is a vertical cross-sectional view orthogonal to the axial direction of the multi-strand cable protection tube according to the eighth embodiment of the present invention.

FIG. 10 is a vertical cross-sectional view orthogonal to the axial direction of the multi-strand cable protection tube according to the ninth embodiment of the present invention.

FIG. 11A shows the internal structure of the multi-strand cable protection tube of the tenth embodiment of the present invention, which is XIA-XIA of FIG. 11B.
FIG. 11 is a partial cross-sectional view showing a state viewed from the direction.
It is a longitudinal cross-sectional view orthogonal to the axial direction of the multi-section cable protection tube shown in (A).

FIG. 12 is a vertical sectional view showing another embodiment of the present invention.

FIG. 13A is a vertical sectional view showing still another embodiment of the present invention, and FIG. 13B is a vertical sectional view showing still another embodiment of the present invention.

FIG. 14 (A) is a vertical sectional view showing still another embodiment of the present invention, and FIG. 14 (B) is a vertical sectional view showing still another embodiment of the present invention.

FIG. 15A is a vertical sectional view showing still another embodiment of the present invention, and FIG. 15B is a vertical sectional view showing still another embodiment of the present invention.

FIG. 16 (A) is a vertical sectional view showing still another embodiment of the present invention, and FIG. 16 (B) is a vertical sectional view showing still another embodiment of the present invention.

FIG. 17 is a vertical sectional view showing still another embodiment of the present invention.

FIG. 18 (A) is a front view showing a conventional multi-strand cable protection tube, and FIG. 18 (B) is a multi-strand cable protection tube shown in FIG. It is sectional drawing which shows a state.

19A is a front view showing another conventional multi-strand cable protection tube, and FIG. 19B is a multi-strand cable protection tube shown in FIG. It is sectional drawing which shows the state looked at.

20A is a perspective view showing still another conventional multi-strand cable protection tube, and FIG. 20B is a front view showing the multi-strand cable protection tube shown in FIG. 20A.

[Explanation of symbols]

10, 16, 22, 24, 34, 38, 40, 44 ...
Multi-strand cable protective tubes 12, 26 ... Protective tubes 14, 32, 50 ... Fused portion 18 ... Film 20, 36 ... Fixed portion 26 ... Protective tube 42 ... Outer tube 46 ... Increased tube space 48 ... , 66, 72, 80, 82, 88, 90, 9
6,98 ... Multi-strand cable protection tubes 54, 62, 68, 76, 78, 84, 86, 92, 9
4 ... Core materials 14, 32, 50 ... Fused portions 58, 64, 74 ... Fixed portions

Continued front page    (72) Inventor Kazunori Ueda             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Inside the Tavinyl pipe factory F-term (reference) 3H111 AA02 BA15 CA26 CA29 CA57                       DA26 DB23                 5G369 AA19 BA04 DC03

Claims (3)

[Claims] 1. A multi-strand cable protection tube, wherein adjacent protection tubes are in contact with each other and are bound in a multi-strand state. 2. The binding of the multiple protective tubes is performed by fixing adjacent protective tubes to each other, fixing adjacent protective tubes through a film, fixing each protective tube to a core member, The multi-strand cable protection tube according to claim 1, which is formed by knitting a plurality of the protection tubes. 3. A multi-strand cable protection tube, further comprising an outer tube, wherein the multi-strand cable protection tube according to claim 1 is arranged in the outer tube.