JPH11205982A - Conduit structure and cable laying conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conduit structure which can lay a cable conduit while conducting connection work easily without requiring heavy machinery for laying the conduit, in a multiple conduit for laying cables which permits a cable to be laid additionally in a large conduit if necessary. SOLUTION: A conduit structure body 1 is constituted of a pair of resin troughs 1a, 1a combined so as to face each other. Respective resin troughs 1a are formed with a groove 10 with a semicircular cross-section continuously in a longitudinal direction so as to form a single circular hole in a condition combined so as to face each other, and at both the end parts in the groove 10, a groove-shaped recessed part 11 of bed width is formed continuously along a circumferential direction of the groove 10. By a joint member 2 which is formed with collar parts 20 guided to the recessed parts 11 of the respective conduit structures 1, 1 continuously or discontinuously in a circumferential direction at both the end parts, it is possible to connect the conduit structures 1, 1, and constitute a laying conduit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline structure suitable for forming a large-diameter pipeline for drawing a plurality of cables therein, and a cable laying pipeline using the pipeline structure. It is about.

[0002]

2. Description of the Related Art In recent years, a large pipeline having an inner space with a large cross-sectional area has been laid in advance along, for example, an underground along a road or a highway network, and a sheath is provided in the pipeline as required. Composite conduits have been proposed that retract the tubes and route cables through these sheath tubes. Such a composite pipeline draws a new sheath pipe into a large pipeline already laid when it is expected that the existing cable will not be able to meet the demand due to an increase in demand. It is intended to facilitate the installation of a new cable by passing a new cable through the pipe. That is, the advantage of the composite pipeline is that it can flexibly cope with an increase in demand while reducing the amount of new digging and other new laying work of a road when adding a new cable.

[0003] A large pipe for cable laying as described above includes a trough made of reinforced concrete (JIS A532).
1, A5325, etc.), gutters made of reinforced concrete (JI
SA5345) and fume pipes made of reinforced concrete (JIS A5303) have been used. However, these are heavy (90 to 125 kg per 1 m) and require heavy equipment for laying work. Use of a resin pipe such as JIS K6761) has been proposed.

For example, Japanese Patent Application Laid-Open No. 9-65562 discloses that
As shown in FIG. 8, a plurality of grooves 3 having a semicircular cross section are formed on one surface.
The resin troughs 3, 3 having a zero are combined so that the grooves 30 face each other, and a cable (not shown) is passed through a circular hole 3a formed by the overlapping grooves 30 of the resin troughs 3, 3. A configured cable laying conduit is described. In this cable laying conduit, the lower resin trough body 3 is placed in a groove excavated from the road surface, and a cable is guided to each groove 30 of the resin trough body 3 so that the lower resin trough body 3 The upper resin troughs 3 are superimposed on each other and combined, and the troughs 3 and 3 are laid in such a manner as to be filled with earth and sand.

[0005]

In the cable laying pipe shown in FIG. 8, the pipe is composed of a pair of troughs 3, 3 so that the weight of the trough 3, which is a split of the pipe, is reduced. However, while there are advantages such as reduction in size and ease of laying work, there are the following problems. That is, first, since it is a porous pipe as a whole, and one cable is passed to each of the circular holes 3a, a composite pipe in the original meaning could not be formed. Secondly, each pipe structure formed by the resin trough bodies 3 and 3 is designed to have an appropriate length in consideration of convenience in laying work and bending of the pipe. It was difficult to connect the line components together, especially at the bends in the line. Third, when the resin troughs 3 and 3 are combined to face each other in laying the pipeline, special means is required in construction in order to prevent the resin troughs 3 and 3 from shifting from each other.

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite pipeline for laying a cable in which a cable can be additionally laid as needed in a large-sized pipeline, without requiring a heavy machine to lay the pipeline, and more easily. It is an object of the present invention to provide a pipeline structure capable of performing a laying operation. It is another object of the present invention to provide a pipe structure that can lay a cable laying pipe while connecting very easily by using a joint member having a simple structure. Still another object of the present invention is to provide a pipeline structure which can be laid while combining the divided parts very easily when laying the pipeline. Yet another object of the present invention is to
By using a pipeline structure that achieves the above-mentioned purpose,
It is an object of the present invention to provide a cable laying pipe which is easy to be constructed so as to be continuous at a required portion with a bend. Still another object of the present invention is to provide a cable laying pipe which can prevent earth and sand from entering the pipe at a bent connection portion of the pipe. It is still another object of the present invention to provide a cable laying conduit in which a sheath pipe for passing a cable is drawn in more smoothly after laying.

[0007]

SUMMARY OF THE INVENTION A pipeline structure according to the present invention is configured as follows to solve the above-mentioned problems. In other words, the conduit construction according to claim 1 is a pair of resin troughs 1a, 1a which are combined in an opposing manner.
In each of the resin troughs 1a, a groove 10 having a semicircular cross-section that is continuous in the length direction is formed so as to form a single circular hole 1b in a state where the troughs 1a are combined in an opposing manner.
A groove-shaped recess 11 having a constant width is formed at both ends in the groove 10 and is continuous along the circumferential direction of the groove 10.

According to a second aspect of the present invention, there is provided a pipeline structure.
In each of the pipe troughs, the resin troughs 1a, 1a are provided with engaging portions for preventing the resin troughs 1a, 1a from shifting in the longitudinal direction and the radial direction when the resin troughs 1a, 1a are combined to face each other. 12 are formed on both side edges of the groove 10, and the engaging portion 12 includes a convex piece 12 a formed on one side edge of the groove 10 and the other side edge of the groove 10. The portion is formed at a symmetrical position with respect to the convex piece 12a, and is constituted by an accommodating portion 12b substantially matching the convex piece 12a.

It is desirable in terms of strength that the outer shape of a cross section orthogonal to the longitudinal direction of the pipe structure is rectangular.

A cable laying conduit according to the present invention is configured as follows in order to solve the above-mentioned problems.
In other words, the cable laying conduit according to claim 3 is inserted so that the conduit components 1 and 1 according to claim 1 or 2 straddle each other between the conduit components 1 and 1. Connected by a short tubular joint member 2,
Are formed at both ends of each of the connected conduit structures 1, 1 so that a flange portion 20 guided to the groove-shaped concave portion 11 of each resin trough 1a is continuous or intermittent in the circumferential direction. Between the flange portion 20 of the joint member 2 and the groove-shaped concave portion 11, each of the connected conduit members 1, 1 has a play movable by a predetermined amount in the pipe axis direction. The joint member 2 is preferably formed integrally,
It may be divided into a plurality of portions along the circumferential direction or the length direction, and the plurality of portions divided at the time of use may be assembled into a short tube.

The cable laying conduit according to claim 4 is
The cable laying conduit according to claim 3, wherein at least an outer peripheral surface of the joint member (2) between the flanges (20), (20) is covered with a packing-like member (21) having expandability or elasticity. Features.

The cable laying conduit according to claim 5 is
In the cable laying conduit according to claim 3 or 4, the inner diameter of the joint member 2 is substantially equal to the inner diameter of the circular hole 1b of each of the conduit members 1.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a pipeline structure and a cable laying pipeline according to the present invention will be described with reference to FIGS. First Embodiment FIG. 1 is an exploded perspective view of a conduit structure according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of a cable laying conduit using the conduit structure of FIG. 1, and FIG. FIG. 4 is a partial cross-sectional view of a bent portion of a cable laying pipe line using the pipe line member of FIG. 1, and FIG.

Each pipe structure 1 is composed of a pair of resin troughs 1a, 1a which are combined to face each other. The material of each resin trough 1a is, for example, polyethylene or plastic material. Recycled resin recovered from waste products is used. Each of the resin troughs 1a has a rectangular cross-sectional shape such that the cross-sectional shape of the conduit structure 1 obtained by combining them is substantially square. A single circular hole 1b (FIGS. 2 and 3) is formed in a state where
A groove 10 having a semicircular cross-section continuous in the length direction is formed. At both ends in the groove 10, groove-shaped recesses 1 having a constant width and a uniform depth that are continuous along the circumferential direction of the groove 10.
1 is formed. The step portion, which is the boundary between the concave portion 11 and the inner surface of the groove 10, is formed in an arc-shaped cross section so as to be rounded without being square. Engaging portions 12 are formed on both side edges of the groove 10 so as to prevent the resin troughs 1a, 1a from shifting in the longitudinal direction and the radial direction when the resin troughs 1a are combined to face each other. .

The engaging portion 12 is formed at a symmetrical position between the convex piece 12a formed on one side edge of the groove 10 and the convex piece 12a on the other side edge of the groove 10. ,
It is composed of the convex piece 12a and a housing portion 12b that is substantially compatible. In this embodiment, the engaging portion 12 in which the convex piece 12a and the accommodation portion 12b are paired as described above.
Are formed for convenience, and each resin trough 1a, 1
a, the convex pieces 12a and the accommodating portions 12b are engaged with each other in a meshing manner as shown in FIG. 4, so that lateral displacement between the pair of resin troughs 1a, 1a is prevented. I have.

In the conduit structure 1 of this embodiment, four pairs of the engaging portions 12 composed of the convex pieces 12a and the housing portions 12b are formed on both side edges of the groove 10 as described above. Part 12
Is composed of the convex piece 12a and the housing portion 12b, they need only be formed in at least one pair as shown in FIG. 7, for example. The engaging portion 12 in the form of FIG. 7 has a convex piece 12a formed along the length direction on one side edge of the groove 10.
And a groove-shaped accommodation portion 12b formed on the other side edge of the groove 10 so as to fit with the convex piece 12a. As shown in FIG. 2, the same type of engaging portion 12 (for example, an engaging portion in which the inside of the side edge of the groove 10 is a convex piece 12a and the outside is the accommodation portion 12b, or vice versa).
Are arranged at rotationally symmetric positions about the center axis α of the circular hole 1b in the resin trough 1a, they can be assembled without being aware of the direction of the resin trough 1a.

When laying a cable laying pipe in the ground, the above-described pipe structuring member 1 is used, and the cable laying is carried out in the manner described below. While arranging the pipeline components 1 in a line along a groove (not shown) in which the road surface is cut out, the pipeline components 1 are sequentially connected to each other by using a short tubular joint member 2 as shown in FIG. The joint member 2 is formed of the same resin as the resin trough 1a, and has flanges at both ends thereof having dimensions capable of guiding loosely into the groove-shaped recess 11 at the end of the groove 10 in the resin trough 1a. 20 are formed. The inner diameter of each joint member 2 is designed to be substantially the same as the inner diameter of the circular hole 1b of each conduit member 1. Resin trough 1a, 1a
To form two adjacent pipe line constructs 1 by combining the joint members 2 so as to straddle the ends of the lower resin troughs 1a, 1a placed so as to be continuous in a supine manner. Each flange 20 of the joint member 2 is guided to each groove-shaped recess 11 at the end. Next, another resin trough 1a, 1a is placed on each of the resin troughs 1a, 1a placed in a supine position, and the upper and lower resin troughs 1a, 1a are engaged with each other in an engaging manner. Let it.

With the pair of resinous troughs 1a, 1a combined with the adjacent conduit members 1, 1 in a state in which the joint member 2 is inserted, as shown in FIG. , 20 are incapable of exiting from the recesses 11, 11 between the ends of the adjacent pipeline components 1, 1, so that the adjacent pipeline components 1, 1 are connected by the joint member 2. When there is no bend in the pipeline to be laid, the pipeline construct 1 is filled with earth and sand while the pipeline constructs 1 and 1 are connected linearly as shown in FIG.

In this embodiment, each groove-shaped concave portion 11 of each of the conduit members 1 adjacent to the flange portion 20 of the joint member 2 is formed.
Each of the connected pipe line components 1, 1 has a play that is movable by a predetermined amount Lx (FIG. 2) in the pipe axis direction. That is, as shown in FIG. 1, the width w2 of the flange portion 20 of the joint member 2 is
The widths w1 of the groove-shaped recesses 11 at both inner end portions of each resin trough 1a are formed to be smaller than the widths w1. As shown in FIG. 11,1
The distance L2 between the two is formed smaller than the distance L1 (164 mm) between the flanges 20 at both ends of the joint member 2 by a predetermined amount Lx (32 mm). Therefore, when there is a bend in the conduit, the adjacent conduit constructs 1, 1 can be connected to each other in a bent state and laid on the outer peripheral portion of the joint member 2 as shown in FIG.

In the above-described embodiment, it is sufficient that the joint member 2 is formed into a short tube when used. Therefore, the joint member 2 does not need to be integrally formed.
It may be divided into two parts in the circumferential direction in a state where it can be assembled. The flanges 20 at both ends of the joint member 2 can be implemented not only when they are continuous as shown, but also when they are formed so as to be interrupted in the circumferential direction.

In the cable laying pipe of this embodiment, each pipe forming member 1 has a diameter of the circular hole 1b = 300 mm, a length = 1000 mm, an outer diameter = 390 × 390 mm, and a minimum thickness t.
s (FIG. 4) = 45 mm, the weight of each resin trough 1a = 40 kg, and the minimum bending radius of the pipeline in the state of FIG. 3 = 10 m. According to experiments, troughs made of reinforced concrete (JIS A532
1, A5325, etc.), it is necessary to design the minimum thickness portion ts of each pipe structure 1 to be about 43 mm. Therefore, the circular hole 1 of the pipe structure 1
When the diameter of b is 300 mm, the outer diameter of the conduit structure 1 is 3 mm.
It is desirable to be about 86 × 386 mm.

According to the conduit structure 1 of the above embodiment, first, a pair of resin troughs 1 which are combined to face each other.
Since these parts are constituted by a and 1a, each part is lighter and can be handled only by human power without using heavy equipment when laying the pipeline. Secondly, at both ends of the groove 10 forming the single circular hole 1b, a groove-shaped concave portion 11 having a constant width continuous along the circumferential direction of the groove 10 is formed. By using the short tubular joint member 2 having the flange portion 20 which can be guided to the concave portion 11, it is possible to lay while easily connecting. Third, each of the resin troughs 1a constituting the conduit structure 1 has a square cross-sectional outer diameter, so that it is easy to handle stably when laying the conduit, and the strength is further increased. Fourthly, each resin trough 1a is provided with an engaging portion 12 for preventing the resin troughs 1a, 1a from shifting in the longitudinal direction and the radial direction when the resin troughs 1a are combined in an opposing manner. Because they are formed on the two side edges of 10, they can be very easily combined into a pipeline construction. Fifth, the engaging portion 12 is provided with the groove 1
0 is formed at a symmetrical position between the convex piece 12a formed on one side edge of the groove 10 and the convex piece 12a at the other side edge of the groove 10, and accommodates substantially the same as the convex piece 12a. And the resin trough 1
The configuration of “a” becomes the same, and there is no need to select the type of trough when assembling the pair of resin troughs 1a, 1a into the pipeline structure 1.

According to the cable laying conduit of the above-described embodiment, firstly, both ends of the short tubular joint member 2 can be guided to the groove-shaped concave portions 11 of the adjacent conduit constructs 1, 1. The flange 20 is formed, and the flange 20 and the groove-shaped recess 11 are formed.
Since each of the connected pipe line components 1, 1 has a play that is movable in the pipe axis direction by a predetermined amount, the required portions can be continuously bent and bent. Secondly, the diameter of the circular hole 1b of the conduit structure 1 and the inner diameter of the joint member 2 are substantially the same, and the step portion, which is the boundary between the concave portion 11 and the inner surface of the groove 10, is formed in an arc-shaped cross section. Therefore, the sheath tube is not hooked on the inner wall of the pipeline when the sheath tube is drawn in for passing the cable, and the sheath tube can be more smoothly and quickly drawn.

Second Embodiment FIG. 5 is a partial sectional view showing a modification of the joint member, and FIG.
It is a fragmentary sectional view of the pipeline structure connected using the joint member of FIG. In this embodiment, a packing-like member 21 made of a shrink-proof foam sheet is adhered to the outer peripheral surface of the joint member 2 between the flange portions 20 at both ends by a double-sided adhesive tape (not shown). This joint member 2
When the pipe structure members 1 and 1 are connected in a bent state at the connecting portion as shown in FIG. 6, the packing-like member 21 is compressed (crushed), and the respective pipe line members 1 and 1 are connected. Are closed by the packing-like member 21, so that it is possible to prevent earth and sand and the like from entering the inside from the connecting portion between the pipe line constructs 1, 1. In this embodiment, the difference between the inner diameter of the end of each of the conduit members 1 and 1 and the outer diameter between the flanges 20 of the joint member 2 is about 5 mm (the average gap between the two is 2.5 mm). The thickness of the shape member 21 is 5 mm. When the packing-like member 21 is a sheet having rubber or other elasticity, it prevents not only the intrusion of earth and sand from the connecting portion of the respective pipe line components 1, 1 but also the intrusion of moisture into the inside. be able to.

[0025]

According to the first aspect of the present invention, there is provided a pipe structure comprising a pair of resin troughs 1 which are combined in an opposing manner.
Since these parts are constituted by a and 1a, each part is lighter and can be handled only by human power without using heavy equipment when laying the pipeline. Moreover, the resinous troughs 1a, 1
At both ends of the groove 10 having a semicircular cross section that forms a single circular hole 1b when the combination of a is performed, a groove-shaped concave portion 11 having a constant width continuous along the circumferential direction of the groove 10 is formed. Therefore, by using the short tubular joint member 2 having the flange portions 20 which can be guided to the concave portions 11 at both ends, it is possible to connect and lay the cable very easily.

According to the second aspect of the present invention, the resin pipe troughs 1a are formed on both side edges of the groove 10 of each resin trough 1a when the respective resin troughs 1a, 1a are combined to face each other. Since the engaging portions 12 for preventing the displacement in the length direction and the radial direction are formed, it is possible to extremely easily combine them with the conduit structure when laying the conduit. The engaging portion 12 is formed at a symmetrical position between the convex piece 12a formed on one side edge of the groove 10 and the convex piece 12a on the other side edge of the groove 10. , The convex portion 12a and the accommodating portion 12b substantially conforming to the convex piece 12a, the configuration of each resin trough 1a becomes the same, and when assembling the pair of resin troughs 1a, 1a into the conduit structure 1, There is no need to select the type of trough.

According to the third aspect of the present invention, at both ends of the short tubular joint member 2, the guides are guided to the groove-shaped recesses 11 of the adjacent pipeline components 1. A flange portion 20 is formed so that each of the connected conduit members 1, 1 has a play that is movable by a predetermined amount in the pipe axis direction between the flange portion 20 and the groove-shaped concave portion 11. Therefore, it is possible to continuously perform the work by bending the necessary parts. Also, by setting the amount of play in a predetermined range,
By preventing extreme bending, it is possible to ensure that the cable has a preferable allowable range for the cable when the cable is later pulled in.

According to the cable laying pipe according to the fourth aspect of the present invention, a packing-like member 21 having elasticity or shrinkage resistance is provided between at least the flange portions 20 on the outer peripheral surface of the joint member 2. Coated. Therefore, when the pipe line components 1 and 1 are connected in a bent state at their ends using the joint member 2, the packing-like member 21 is compressed (crushed), and each pipe line member 1 is compressed. , 1 are closed by the packing-like member 21, so that soil and the like can be prevented from entering the inside of the connecting portion between the pipe line constructs 1, 1.

According to the cable laying pipe according to the fifth aspect of the present invention, since the diameter of the circular hole 1b of the pipe structure 1 and the inner diameter of the joint member 2 are substantially the same, the cable can be routed. The sheath tube is not caught on the inner wall of the pipeline during the retraction of the sheath tube for the purpose, and the sheath tube can be more smoothly and quickly drawn into the pipeline.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pipeline structure according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the cable laying conduit using the conduit construction of FIG. 1 in a state where a resin trough is removed from an upper portion of the conduit.

3 is a partial cross-sectional view of a bent portion of a cable laying pipeline using the pipeline configuration body of FIG. 1;

FIG. 4 is a cross-sectional view of the conduit structure of FIG. 1;

FIG. 5 is a partial sectional view showing a modification of the joint member.

FIG. 6 is a partial cross-sectional view of a state in which the pipeline members are connected using the joint member of FIG. 5;

FIG. 7 is a perspective view showing a modification of the resin trough.

FIG. 8 is a partial perspective view showing a conventional conduit construction for laying a cable.

[Explanation of symbols]

 α Center axis of circular hole 1 Pipeline structure 1a Resin trough 1b Circular hole 10 Groove 11 Groove-shaped recess 12 Engagement portion 12a Convex piece 12b Housing 2 Joint member 20 Flange 21 Packing-like member 3 Resin trough Body 3a Circular hole 30 groove

Claims (5)

[Claims] 1. A single circular hole 1b is formed in each of the resin troughs 1a in a state where they are combined in a mutually opposing manner. A groove 10 having a semicircular cross section continuous in the length direction is formed as described above, and a groove-shaped concave portion 11 having a constant width continuous along the circumferential direction of the groove 10 is formed at both ends in the groove 10. A pipe structure. 2. An engaging portion 1 for preventing the resin troughs 1a, 1a from shifting in the longitudinal direction and the radial direction when the resin troughs 1a, 1a are combined to face each other.
2 are formed on both side edges of the groove 10, and the engaging portion 12 is formed with a convex piece 12 a formed on one side edge of the groove 10 and the other side edge of the groove 10. Formed at a position symmetrical to the convex piece 12a at the portion,
2. The conduit structure according to claim 1, wherein the conduit structure is constituted by: a) and an accommodating portion 12b that is substantially compatible. 3. The conduit construction 1, according to claim 1,
1 are connected to each other by a short tubular joint member 2 inserted so as to straddle the inside of each of the conduit members 1, 1, and each of the conduit members connected to both ends of the joint member 2. The groove-shaped recess 1 of each resin trough 1a
1 is formed so as to be continuous or intermittent in the circumferential direction, and between the flange 20 of the joint member 2 and the groove-shaped concave portion 11, each connected conduit structure A conduit for laying a cable, characterized in that the pipes (1, 1) have a play that is movable in a pipe axial direction by a predetermined amount. 4. A packing-like member 21 having expandability or elasticity is coated between at least the flanges 20 on the outer peripheral surface of the joint member 2. 4. The cable laying conduit according to 3. 5. The cable laying conduit according to claim 3, wherein an inner diameter of the joint member 2 is substantially equal to an inner diameter of the circular hole 1b of each of the conduit members 1.