JP4213802B2 - Pipe material laying jig and laying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jig for laying pipe materials useful for constructing an information pipe such as an optical fiber network by drawing an inner pipe into a buried outer pipe connecting underground buried boxes.
[0002]
[Prior art]
Construction of an information network by connecting underground boxes called information boxes with cables (particularly optical fiber cables) is being promoted. For laying the information box, a hard or reinforced outer pipe (main pipe or body pipe) for connecting the information boxes and a long inner pipe (sheath pipe) drawn into the outer pipe are used. A network is formed by passing cables (such as an optical fiber) through the inner pipe.
[0003]
In order to protect the inner pipe, the outer pipe is usually composed of a hard synthetic resin (polyvinyl chloride or the like), a metal, or a pipe material (straight pipe or curved pipe) formed of a composite member of a metal member and a resin member. Various pipe bodies are used as the inner pipe, but a long flexible pipe formed of a synthetic resin in a spiral or annular wave shape is often used. When piping a long and flexible inner pipe in the outer pipe, the outer pipe is constructed by the method shown in FIG. That is, an outer pipe 31 is provided between the hand holes 33a and 33b, and the inner pipe 32 fed out from the drum 34 on the inlet side hand hole 33a side passes between the hand holes 33a and 33b via the guide roller 36a. Then, it is drawn into the outer pipe 31 piped to the outlet, and is drawn out from the hand hole 33b on the outlet side while being wound up by the retractor 35 via the guide roller 36b. In such pipe construction, an installation jig is used to draw the inner pipe.
[0004]
FIG. 5 is a schematic perspective view showing a conventional jig. This jig includes a three-pronged traction connecting member 23 for detachably connecting a plurality of inner tubes 21a, 21b, 21c via a connecting member 22, and an eyebolt 24 formed at the tip of the traction connecting member. The connecting member 22 is composed of ring chains 22a, 22b, 22c having connecting portions to the inner pipes 21a, 21b, 21c.
[0005]
In such a jig, the inner tube is drawn into the outer tube as follows. That is, a pulling wire (not shown) is fastened to the eyebolt 24 via a twist-back unit (not shown), and usually in an appropriate position on the ring chain 22a, 22b, 22c of the connecting member 22 in the outer tube. When there is a trouble in drawing in, a reference line (not shown) for pulling the inner pipe back to the introduction side is fastened. Also, pilot wires for laying cables such as optical fibers are connected to the ring chains 22a, 22b, and 22c. Then, while feeding out the inner pipe together with the nominal line, the trident traction connecting member 23 is pulled by a pulling wire introduced in advance into the outer pipe from the inlet side hole (manhole, etc.) to the outlet side hole. By pulling out the pulling wire, the inner tube can be guided and drawn into the outer tube. In some cases, a mesh-like cylinder that can be attached to the outer surface of the inner pipe is used for the connection between the inner pipe and the connecting member.
[0006]
However, the outer pipe is usually formed by connecting a plurality of pipes (straight pipes or curved pipes) having a length of about 5 m to each other by a method such as fitting. Usually, a step is generated. Accordingly, in the pulling operation of the inner pipe, the jig or the inner pipe is caught on the step portion of the outer pipe, and the inner pipe cannot be drawn smoothly and installed. Furthermore, the connecting operation between the inner pipe and the connecting member 22 is complicated, and the laying work efficiency is greatly reduced.
[0007]
In order to reduce the catch with the connecting step of the outer pipe, a tip member bulged in a direction perpendicular to the axial direction is formed between the trident traction coupling member 23 and the eyebolt 24 with respect to the axial direction. There has also been proposed a jig for laying a pipe material disposed so as to be rotatable in the circumferential direction. However, even in such a jig, the three-pronged traction connecting member 23 and the connecting member 22 on the downstream side of the tip member, the connecting portion between the connecting member 22 and the inner tube 21, and the outer surface of the inner tube itself are the outer tube. It is easy to engage with the connection step.
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a conduit member laying jig capable of smoothly pulling and laying an inner tube into an outer tube.
[0009]
Another object of the present invention is to provide a pipe material laying jig that can easily and reliably pull an inner pipe into an outer pipe and greatly improve the laying workability of the inner pipe.
[0010]
[Means for Solving the Problems]
The present inventors have found that when a guide portion having a spherical head is used, even if a connection portion having a step is generated in the outer tube, the inner tube can be laid while being drawn into the outer tube smoothly and reliably. Completed the invention.
[0011]
That is, the jig for laying a pipe material according to the present invention is a jig for drawing an inner pipe into a submerged outer pipe and laying it, and a guide part having a curved head such as a spherical shape, A pulling connection means for pulling the guide portion, and a mounting portion formed at a downstream portion of the curved head portion of the guide portion and detachable from the inner tube are provided. When such a jig is used, when the inner tube is mounted on the mounting portion located downstream of the curved head of the guide portion, and the guide portion is pulled by the traction means via the traction connecting means, the guide portion is bent. Since the head leads the inner pipe, even if there is a step in the connection part of the outer pipe, the guide part does not engage with the step part, and the inner pipe can be drawn into the outer pipe while smoothly guiding it. it can.
[0012]
In such a pipe material laying jig, the guide portion includes a curved head portion having a spherical shape and the like, and a threaded portion (such as a helical mounting portion) connected to a downstream portion of the head portion, You may comprise by the connection part which can be formed in a screwing part (for example, end surface of a screwing part), and can connect a pilot wire. At least one end portion of the inner tube may be screwable to the screwing portion, and the inner tube may be formed of a spiral wave shaped inner tube. Such an inner tube can be easily and reliably mounted by screwing an end portion of the inner tube to the screwing portion (such as a helical mounting portion) of the guide portion.
[0013]
In addition, the traction coupling means has an insertion hole into which at least one portion of the end portion of the inner tube and the screwing portion of the guide portion can be inserted in a state where the curved head is exposed, and You may comprise with the connection part which can connect the pulling wire for pulling this pulling connection member. Further, the traction coupling means includes a plurality of cylindrical bodies having insertion holes into which at least one of the end portions of the guide portion mounting portion (such as a spiral mounting portion) and the inner tube (such as a spiral inner tube) can be inserted; You may comprise by the connection member for connecting these cylinders, and the connection part which is formed in this connection member and can connect a traction wire. Furthermore, in order to draw the inner tube more smoothly, the outer diameter of the curved head may be larger than the outer diameter of the spiral inner tube and the outer diameter of the cylindrical body. Thereby, a pulling connection member and an inner pipe do not contact a level difference part.
More specifically, the laying jig of the present invention is a jig for laying an inner pipe into a buried underground pipe, and has a guide portion having a curved head and a pulling portion of the guide portion. Traction connecting means for
The guide portion is connected to the downstream portion of the curved head portion, and can be screwed into at least one end portion of the inner tube, and is formed in the screwed portion, and a pilot wire is connected to the guide portion. Consisting of possible connections,
The traction connecting means has a plurality of insertion holes into which at least one of the end portion of the inner tube and the threaded portion of the guide portion can be inserted in a state where the curved head is exposed, and the curved portion head comprises a 牽 pull coupling member to be locked, and a connecting portion traction wire can be connected to towing the towing coupling member.
Furthermore, the method of the present invention uses the laying jig provided with a guide portion having a curved head and a traction connecting means for pulling the guide portion, and the inner tube is placed in the underground buried outer tube. A method of drawing in and laying,
The guide portion is connected to the downstream portion of the curved head portion, and can be screwed into at least one end portion of the inner tube, and is formed in the screwed portion, and a pilot wire is connected to the guide portion. Consisting of possible connections,
The traction connecting means has a plurality of insertion holes into which at least one of the end portion of the inner tube and the threaded portion of the guide portion can be inserted in a state where the curved head is exposed, and the curved portion and head can be engaged a牽 pull coupling member, the traction wire for retracting the towing coupling member has a connecting portion connectable,
At least one of the end portion of the inner tube and the screw portion of the guide portion is inserted into the insertion hole of the pulling connecting member, and the screw portion of the guide portion is screwed to the end portion of the inner tube. The traction member is pulled in a state where the curved head portion and the traction connection member are locked, and the traction connection member and the inner tube are drawn into the outer tube without contacting the step portion of the outer tube.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings as necessary.
1 is a schematic exploded perspective view showing an example of a jig for laying pipe material according to the present invention, FIG. 2 is a schematic view showing a laying state of an inner pipe using the jig of FIG. 1, and FIG. It is the schematic which shows the arrangement | sequence state of the jig | tool in an outer pipe | tube.
[0015]
The jig shown in FIG. 1 includes a guide portion 1 for smoothly guiding the spiral wave-shaped inner tube 10 in the outer tube 12 and a traction connecting member 5 for pulling the guide portion in the outer tube 12. A spiral wave-shaped inner tube 10 detachably attached to the guide portion 1 together with the pulling connecting member is pulled and installed in the outer tube 12.
[0016]
The guide portion 1 is connected to a curved spherical head portion 2 having a large diameter and a downstream portion of the curved head portion (that is, extends from the curved head portion 2), and is smaller in diameter than the curved head portion 2. A spiral mounting portion (or a spiral shaft portion) 3 and a ring-shaped connection portion 4 formed on the end surface of the spiral mounting portion and to which a pilot wire 11 can be connected. The pilot wire 11 can be connected or connected to cables such as an optical fiber. A spiral concavo-convex portion is formed on the inner wall of the spiral wave-shaped inner tube 10, and the spiral mounting portion 3 of the guide portion 1 can be screwed to the inner wall of the end portion of the spiral inner tube 10. .
[0017]
The traction connecting member 5 is for connecting a plurality of cylinders 7 having insertion holes 6 into which the end of the spiral inner tube 10 can be inserted, and these adjacent cylinders 7 by a joining means such as welding. The plate-like connecting member 8 and a connecting portion 9 that protrudes from the central portion in the longitudinal direction of the connecting member and that can be connected to a pulling wire such as a wire. The connecting portion 9 includes a pulling wire. A connection hole 9a that can be connected or connected directly or via a ring chain 9b is formed.
[0018]
In FIG. 1, the connection between the guide portion 1 and the inner tube 10 is shown in the central tube 7 of the three tubes 7, and the guide portions corresponding to the left and right inner tubes 10 are not shown. .
[0019]
In such a jig, the end of the spiral wave inner tube 10 is inserted into the insertion hole 6 of the cylindrical body 7, and the spiral mounting portion of the guide portion 1 is inserted into the inner wall of the end of each spiral wave inner tube 10. By screwing 3, the guide portion 1 and the inner tube 10 can be reliably connected by a simple operation of screwing.
[0020]
In this example, the outer diameter R of the curved head 2 is formed larger than the outer diameter R1 of the cylindrical body 7 and the outer diameter R2 of the spiral inner tube 10 (R> R1, R> R2). , R1> R2). Therefore, when the curved head 2 is positioned on the protruding connection portion 9 side and the spiral mounting portion 3 and the end of the spiral inner tube 10 are mounted by screwing in the insertion hole 6 of the cylindrical body 7, the curved head is mounted. The side wall of the part 2 can be locked with the end surface of the cylindrical body 7, and the guide part 1 cannot be extracted in the direction opposite to the protruding direction of the connecting part 9.
[0021]
The jig shown in FIG. 1 can be used as a jig for drawing the inner pipe into the underground buried outer pipe. That is, the pilot wire 11 inserted in advance in the inner tube in order to insert the end of the spiral wave shaped inner tube 10 into the insertion hole 6 of the tubular portion 7 of the traction connecting member 5 and to lay cables such as optical fibers. After being fastened to the connection part 4 of the ring part 1, the helical mounting part 3 of the guide part 1 is inserted into the end part of the inner tube 10 and screwed. If necessary, a pulling wire is fastened to the connection hole 9a or the ring chain 9b of the connection portion 9 via a twist back unit (not shown), and a call wire (not shown) is connected to the connection hole 9a or the ring chain 9b. Fastening and drawing out the inner pipe 10 together with the nominal line, the towing connecting member 5 is pulled by the pulling wire drawn in advance into the outer pipe 12 from the inlet side hole (manhole, etc.) to the outlet side hole. The inner pipe 10 can be guided and drawn into the outer pipe 12 by pulling out the pulling wire from the outer pipe 12. The working position where the helical mounting portion 3 of the guide portion 1 and the inner tube 10 are screwed together may be the front outside (upstream side) of the cylindrical body 7. Located inside the body 7.
[0022]
The head portion of the guide portion is not limited to a spherical shape as long as the engagement of the outer tube with the connection step portion can be suppressed, and may be a warhead shape. Further, the mounting portion formed in the downstream portion of the curved head of the guide portion may be detachable from the inner tube as long as it cannot be detached from the inner tube in the process of laying the inner tube by traction. The inner tube can be selected according to the end structure. For example, when the outer wall of the end portion of the inner tube is formed as a spiral concavo-convex portion, the mounting portion of the guide portion may be configured by a hollow cylindrical portion having an inner wall that can be screwed to the spiral outer wall. Well, in the case of a spiral or non-spiral inner tube in which an engaging part such as an irregular shape or a hole is formed at the end, the mounting part of the guide part is engaged with the engaging part so as not to fall off. Or it may be hookable. In a preferred embodiment, the guide portion includes a curved head (particularly a hemispherical head) and a screw that is connected to a downstream portion of the head and is screwable with at least one end of the inner tube. The connecting portion (spiral mounting portion) and a connecting portion or a connecting portion formed in the screwing portion and connectable or connectable to the pilot wire are configured.
[0023]
As long as the guide unit can be pulled by the traction unit, the traction coupling unit is directly connected to the curved head (particularly the top of the curved head) leading the inner pipe without the traction coupling member. Or a connecting part (for example, a single or plural rings swingably attached to the curved head, or a connecting part having a hole or a ring like the connecting part 9). .
[0024]
Further, it is not necessary to connect a plurality of adjacent cylindrical portions with a connecting member, and the pulling connecting member has an insertion hole into which an end portion of the inner tube and / or a mounting portion (screwed portion or the like) of the guide portion can be inserted. You may comprise with the single member (for example, single cylinder 7) which has. Even when such a pulling connection member is used, the inner pipe can be smoothly guided in the outer pipe in a state where the curved head is exposed (that is, a state where the curved head is led). In addition, the connection part (or connection part) which can connect or connect the pulling wire materials, such as a wire, is normally formed in the said pulling connection member. In addition, it is only necessary that at least one of the end portion of the inner tube and the mounting portion (screwed portion) of the guide portion can be inserted into the insertion hole, and the insertion hole is inserted as in the example shown in FIG. You may mount | wear with an inner pipe | tube and a mounting part in the state which inserted both site | parts in the hole.
[0025]
FIG. 4 is a schematic perspective view showing another example of the present invention. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is common in the member shown in the said FIG.
In this example, the length of the shaft portion extending from the curved head portion 2 of the guide portion 1 is formed larger than the length of the plurality of cylindrical bodies 7 in the axial direction, and the spiral mounting portion is formed at the end portion of the shaft portion. 13 is formed. Therefore, the shaft portion of the guide portion 1 is inserted into the insertion hole 6 of the cylindrical body 7, and the helical inner tube 10 is attached to the helical attachment portion 13 protruding from the cylindrical body 7 by screwing. In such a jig, since the helical mounting portion 13 protrudes from the cylindrical body 7, the mounting portion of the guide portion 1 (spiral mounting portion 13) and the inner tube 10 can be easily mounted.
[0026]
Further, the inner tube may be attachable to the cylindrical body. For example, a spiral concavo-convex portion may be formed on the inner wall of the cylinder, and the spiral end portion of the outer wall of the inner tube may be screwed onto the inner wall of the cylinder.
[0027]
When laying multiple inner pipes, such as laying cables such as optical fibers, guide each of the inner pipes while positioning them, and in order to increase the connection efficiency with the corresponding cable in the information box, It is advantageous to use a traction coupling member having a plurality of insertion holes corresponding to the number. The traction connecting member having a plurality of insertion holes is usually formed by connecting a plurality of cylinders arranged in a predetermined pattern in order to lay a plurality of inner pipes at the same time. The arrangement pattern of the plurality of cylinders may be parallel as described above, or may be an arrangement pattern in which parallel cylinders are stacked, a pattern in which cylinders are arranged concentrically, or the like.
[0028]
In the pulling connecting member connecting a plurality of cylinders, the connecting part of the adjacent cylinders can be formed in a proper position as long as the locking with the connection step portion of the outer tube can be suppressed, and the connecting member connecting the adjacent cylinders The shape and structure can be selected appropriately. For example, you may join the adjacent part of a cylinder mutually, without arrange | positioning the cylinder 7 on the connection member 8 as mentioned above.
[0029]
Further, the outer diameter of the curved head of the guide portion is not particularly limited as long as the pulling efficiency of the inner tube is not impaired, but it is preferably formed larger than the outer diameter of the inner tube and the outer diameter of the cylindrical body.
[0030]
The jig for laying a pipe material of the present invention can be used for laying a long flexible inner pipe material, and the type of the outer pipe is not particularly limited, and may be a reinforced concrete pipe or the like. The jig of the present invention is useful for installation of conduit materials for laying cables, for example, conduit materials for laying optical fiber cables connecting information boxes, etc. (especially long inner tubes). . Note that the number and arrangement of the inner tubes provided in the outer tube between the information boxes are not particularly limited.
[0031]
【The invention's effect】
In the present invention, since the inner tube is attached to the attachment portion of the guide portion having a curved head and pulled, the inner tube can be drawn smoothly and laid even if a step is generated in the outer tube. Further, the inner pipe can be easily and reliably pulled into the outer pipe, and the laying workability of the inner pipe can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view showing an example of a laying jig for pipe materials according to the present invention.
FIG. 2 is a schematic view showing a state in which an inner pipe is laid by the jig shown in FIG.
FIG. 3 is a schematic view showing an arrangement state of the jig shown in FIG. 1 in the outer tube.
FIG. 4 is a schematic perspective view showing another example of the present invention.
FIG. 5 is a schematic perspective view showing a conventional jig.
FIG. 6 is a schematic view for explaining an installed state of the inner pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Guide part 2 ... Curve head 3 ... Spiral mounting part 4 ... Connection part 5 ... Traction connection member 6 ... Insertion hole 7 ... Cylindrical body 8 ... Connection member 9 ... Connection part 10 ... Inner tube 11 ... Pilot wire 12 ... Outer tube

Claims (3)

A jig for laying and laying the inner pipe into the underground buried outer pipe, comprising a guide portion having a curved head, and a traction connecting means for towing the guide portion,
The guide portion is connected to the downstream portion of the curved head portion, and can be screwed into at least one end portion of the inner tube, and is formed in the screwed portion, and a pilot wire is connected to the guide portion. Consisting of possible connections,
The traction connecting means has a plurality of insertion holes into which at least one of the end portion of the inner tube and the threaded portion of the guide portion can be inserted in a state where the curved head is exposed, and the curved portion and head can be engaged a牽 pull coupling member, laying jig traction wire for retracting the towing coupling member is provided with a connecting portion connectable. A guide portion is connected to a spherical curved head portion, a downstream portion of the curved head portion, and a spiral mounting portion to which an end portion of the spiral wave inner tube can be screwed, and the spiral mounting portion. It is composed of a connection part that is formed on the end face and to which a pilot wire can be connected,
A plurality of cylinders having insertion holes into which at least one of the helical mounting part and the end of the spiral wave-shaped inner pipe can be inserted, and a connecting member for connecting these cylinders; It is formed with this connecting member, and is composed of a connecting part to which a traction wire can be connected,
In the state where the outer diameter of the curved head is larger than the outer diameter of the spiral inner tube and the outer diameter of the cylindrical body, and the curved head is locked to the end surface of the cylindrical body, the spiral mounting portion of the guide section is The laying jig according to claim 1, which is located inside the cylindrical body. A method of laying the inner pipe by drawing it into the underground buried outer pipe using a laying jig provided with a guide part having a curved head and a traction connecting means for pulling the guide part. ,
The guide portion is connected to the downstream portion of the curved head portion, and can be screwed into at least one end portion of the inner tube, and is formed in the screwed portion, and a pilot wire is connected to the guide portion. Consisting of possible connections,
The traction connecting means has a plurality of insertion holes into which at least one of the end portion of the inner tube and the threaded portion of the guide portion can be inserted in a state where the curved head is exposed, and the curved portion and head can be engaged a牽 pull coupling member, the traction wire for retracting the towing coupling member has a connecting portion connectable,
At least one of the end portion of the inner tube and the screw portion of the guide portion is inserted into the insertion hole of the pulling connecting member, and the screw portion of the guide portion is screwed to the end portion of the inner tube. The pulling member is pulled in a state where the curved head and the pulling connecting member are locked, and the pulling connecting member and the inner tube are pulled into the outer tube without contacting the stepped portion of the outer tube. Laying method.

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