JP4594548B2 - Pipe drawing jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe pulling jig used for simultaneously pulling a plurality of pipes having the same diameter or different diameters into an existing or laying underground pipe.
[0002]
[Prior art]
By arranging the pipe inside the underground pipe as described above and passing the cable through it, it is possible to double the protection especially for important cables such as optical fibers and improve safety I can do it.
Conventionally, when a plurality of pipes are disposed in the underground pipe, for example, as shown in FIG. 10, connecting fittings 32 each provided with a connecting ring portion 31 are provided at the tips of the three pipes 30. After screwing, the connecting hooks 34 of the three-groove-shaped pulling member 33 for pulling and connecting them integrally to the connecting ring portion 31 are hooked, and the wire 35 tied to the pulling member 33 is winch. By pulling with a hoisting device such as the like (not shown), the three tubes 30 can be drawn into the underground tube at once.
[0003]
[Problems to be solved by the invention]
According to the above configuration, since the three tubes 30 are not regulated from each other, when the three tubes 30 are moved into the underground tube 1 (see FIG. 3), the three tubes 30 are They move away from each other, such as moving away from each other in the middle of the axial direction of the three pipes 30 or twisting them. As a result, not only does the resistance to movement increase, but they pass into the pipe 1 that is still twisted. It was difficult to do.
[0004]
SUMMARY OF THE INVENTION In view of the above-described situation, the present invention intends to provide a pipe drawing jig that can smoothly insert a plurality of pipes and that can quickly connect a plurality of pipes. .
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an annular or spiral inside the underground pipe, which has a smaller diameter than the underground pipe and in which convex portions and concave portions are alternately positioned in the tube axis direction. In a pipe drawing jig for arranging two pipes formed in a shape at the same time, the pipes enter the inside of the two pipes and pull the pipes together so that the outer surfaces of the pipes are in contact with each other. It is comprised from a pair of clamping member which can be hold | maintained by.
Therefore, when two pipes are pulled in, first, a pair of clamping members are inserted into the two pipes, the pipes are pulled together by the pair of clamping members, and the outer surfaces of the pipes contact each other. Can be held in a state. In this way, by pulling the tip of the two pipes into the underground pipe in a state where the ends of the two pipes are integrated with no gap between them, the pipes are not separated from each other, so that a smooth pull-in operation can be performed. It can be carried out.
[0006]
By providing each of the holding members with a convex portion and a concave portion on the inner surface of the tube in accordance with the pulling operation of the tube, the holding member is provided with the convex portion and the concave portion on the inner surface of the tube. The concavo-convex portion can be locked, and the holding member can be prevented from coming off the tube.
[0007]
By connecting the pair of sandwiching members pivotally around an axis substantially perpendicular to the direction in which the tubes are drawn, both the tubes are simply swung around the shaft around the pair of sandwiching members inserted into the two tubes. Can be attracted.
[0008]
The pair of clamping members are extended to the distal end side from a base end portion of substantially the same shape overlapped in the axial direction, and from the outer side in the width direction of each of the base end portions, and the uneven portion is Each of the sandwiching portions, and in the sandwiched state of the pair of sandwiching portions, at least one of the sandwiching portions and the base end portion extending from the at least one sandwiching portion are connected so that at least the concavo-convex portions are positioned at substantially the same level. The connection part is provided.
Since the base end portions are overlapped with each other as described above, the strength of the base end portions can be improved. Further, since the pair of sandwiching portions are positioned at substantially the same level, it is possible to concentrate the sandwiching force on the tube at one place and make it difficult to remove the sandwiching portion from the tube.
[0009]
In a state in which two pipes are sandwiched between the pair of clamping members, the tube protrudes from the maximum outer shape portion of the tube in the direction of drawing the tube and the maximum outer shape portion of the tube in a direction substantially perpendicular to the pulling direction when viewed in the tube axis direction. By setting the clamping member to a size that does not occur, when the two pipes are sandwiched and inserted into the underground pipe, the clamping member is already placed in the underground pipe. It is possible to reduce contact with objects.
[0010]
A reinforcing flat plate is fixed in contact with the surface of the one base end portion, and another flat tube having the same shape as or different from the tube is sandwiched between the flat plate and the flat plate. The auxiliary clamping member to be fixed is provided so that the posture can be freely changed between a releasing posture in which the tube can be released by being separated from the flat plate and a holding posture in which the tube is held close to the flat plate. .
By fixing the flat plate to the surface of one base end portion as described above, the auxiliary clamping member can be attached to the base end portion while the base end portion can be reinforced.
[0011]
By providing the convex part and the concave part on the inner surface of the tube to a part or all of the clamping side surface of the auxiliary clamping member, the third tube can be removed from the auxiliary clamping member by a locking action. Can be blocked.
[0012]
In a state where three pipes are sandwiched using the pipe pulling jig according to claim 5 or claim 6, by setting so that the shape connecting the axial cores of these pipes substantially forms an equilateral triangle. The three tubes can be integrated in the most compact state.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a pipe drawing used for simultaneously drawing two small-diameter pipes 2 and 2 into an existing underground pipe or an underground pipe 1 being laid along the arrangement route. A jig 3 is shown. A shackle 4 for connecting two clamping members 7, 8 is attached to the tip of the tube pulling jig 3 in order to disable swinging of a pair of upper and lower clamping members 7, 8 described later. Further, the steel wire 6 connected through the swivel 5 for preventing rotation is pulled in by a winding device (not shown) such as a winch. Double protection is performed by inserting an important cable (not shown) such as an optical fiber into the pipe 2 drawn as described above. The swivel 5 can be omitted or replaced with another one. As shown in FIG. 2, the shackle 4 has a U-shaped shackle body 4A and a male screw portion 4C formed at the other end of a front male screw portion 4D through a through hole 4B formed at one end thereof. Shackle pin for screwing and fixing (in the figure, a bolt structure is shown, but a pin structure that can be prevented from coming off may also be a round bar structure) 4P. It may be a connecting tool of the form.
[0014]
As shown in FIGS. 3 (a), 3 (b) and 4 (a), 4 (b), the tube 2 has a circular shape when viewed from the front (may be an ellipse or a square), and in the tube axis direction. The convex portions 2 </ b> A and the concave portions 2 </ b> B are formed in an annular shape (may be spiral) in which the convex portions are alternately located. As shown in the drawing, the convex portion 2A may be formed in any shape such as a triangle, a semicircle, an ellipse, or a trapezoid in addition to a square (gate shape) having a flat upper end surface.
[0015]
As shown in FIGS. 2, 3 (a), (b) and FIGS. 4 (a), (b), the pipe pulling jig 3 enters into the two pipes 2, 2 respectively. A pair of metal (substantially equivalent in terms of strength) that can be held in a state in which the pipes 2 and 2 are pulled close to each other and the outer surfaces of the pipes 2 and 2 are in contact with each other (see FIG. 3B) If necessary, the pair of clamping members 7 and 8 are pivotally connected by hinge bolts (also called hinge pins) P and nuts N in the vertical direction. ing. W shown in FIG. 2 and FIGS. 4A and 4B is a washer. Then, by loosening the shackle pin 4P of the shackle 4 and removing the shackle 4, the pair of clamping members 7 and 8 are swung around the vertical (vertical) axis X of the hinge bolt (pivot support member) P. It is possible to pull the two tubes 2 and 2 and release the holding of the tubes 2 and 2. The shackle pin 4P may be a hexagon socket head bolt or a hexagon bolt. Note that even if the nut N is strongly tightened with respect to the hinge bolt P, the pair of clamping members 7 and 8 are not tightened until they become unrotatable, and the hinge bolt P is merely a pivotal support member. Has been.
The holding members 7 and 8 are provided with uneven portions 7A and 8A that are engaged with the convex portions 2C and the concave portions 2D of the inner surfaces of the tubes 2 and 2 in accordance with the pulling operation of the tubes 2 and 2, respectively. , 8 is not easily detached from the tubes 2 and 2. The concave and convex portions 7A and 8A are formed by a large number of substantially mountain-shaped convex portions 7B and 8B and arc-shaped concave portions 7C and 8C alternately in the longitudinal direction, but the shape and the convex portions 7B and 8B and the concave portions The number of 7C and 8C may be other than that shown in the figure.
[0016]
As shown in FIG. 2, the pair of clamping members 7 and 8 have base end portions 9 and 10 having substantially the same shape that are overlapped in the axial direction X (vertical direction), and these base end portions 9 and 10, respectively. And the sandwiching portions 11 and 12 provided with the concave and convex portions 7A and 8A, respectively. In the sandwiched state of the pair of sandwiching portions 11 and 12, the concave and convex portions 7A and 7A, Connecting portions 13 and 14 that are bent obliquely are provided for connecting the holding portions 11 and 12 and the base end portions 9 and 10 extending therefrom so that 8A is positioned at substantially the same level. Here, by providing the two connecting portions 13 and 14 in the respective holding members 7 and 8, there is an advantage that the angle at which they are obliquely bent toward the sides approaching each other can be reduced, but one holding member 7 or It is also possible to carry out by providing the connecting part only in 8. In addition to bending the connecting portions 13 and 14 obliquely, the connecting portions 13 and 14 may be bent at a right angle. When the holding members 7 and 8 are made of hard resin or the like, the connecting portions 13 and 14 can be integrally formed at the time of forming.
[0017]
As shown in FIG. 4B, in the state where the two tubes 2 and 2 are sandwiched between the clamping members 7 and 8, the maximum of the tubes 2 and 2 in the direction of pulling the tubes 2 and 2 in the tube axis direction view. The dimensions of the holding members 7 and 8 are set so that the holding members 7 and 8 do not protrude from the outer shape portions 2E and 2E and the maximum outer shape portions 2F and 2F of the tubes 2 and 2 in a direction substantially perpendicular to the pulling direction. When the two pipes 2 and 2 are sandwiched between the sandwiching members 7 and 8 and inserted into the underground pipe 1, the sandwiching members 7 and 8 are already disposed in the underground pipe 1. It is possible to smoothly insert the tubes 2 and 2 by reducing contact with other objects such as 2.
[0018]
The case where the two pipes 2 and 2 are sandwiched and fixed by the pipe pulling jig 3 configured as described above will be described. First, the shackle pin 4P is loosened to connect the shackle 4 to the pipe pulling jig 3. By removing the two, the tips of the two holding members 7 and 8 that have become free are slightly opened (see FIG. 3A), and then the holding portions 11 and 12 are inserted into the two tubes 2 and 2. . Next, by forcibly swinging the holding members 7 and 8 using a tool or the like toward the side where the tubes 2 and 2 are drawn, the unevenness of the holding members 7 and 8 is obtained as shown in FIG. After the portions 7A and 8A are strongly locked (engaged) with the convex portions 2C and the concave portions 2D of the tubes 2 and 2, the shackle 4 is connected to the tube drawing jig 3 to thereby hold the holding member Since the engaging state between the convex and concave portions 7A and 8A of the seventh and eighth portions and the convex portions 2C and the concave portions 2D of the tubes 2 and 2 is maintained, the two tubes 2 and 2 are sandwiched and held by the tube pulling jig 3. is there. As described above, the shackle (connecting member) 4 is vertically penetrated at the front end in the longitudinal direction of the sandwiching members 7 and 8 with respect to the hinge bolt (pivot support member) P, so that the sandwiching members 7 and 8 cannot swing. By adopting the configuration, there is an advantage that the holding members 7 and 8 do not open unless the shackle 4 or the holding members 7 and 8 are deformed. For example, the shackle 4 is omitted and the hinge bolt P and the nut N are used. It is good also as a structure which fixes the clamping members 7 and 8 by the frictional force between these members 7 and 8 so that rocking is impossible.
[0019]
In FIG. 1 to FIG. 4, the pipe pulling jig 3 that sandwiches the two pipes 2 and 2 and draws them into the underground pipe 1 is shown, but as shown in FIG. 5 to FIG. It may be a tube pulling jig 3 that holds the tubes 2, 2, 2. FIG. 5 shows a case where two pipes 2 and 2 are sandwiched so that a specific portion of the pipe drawing jig 3 can be seen. In the figure, all the tubes have the same diameter, but tubes having different diameters may be sandwiched.
That is, as shown in FIG. 6, the reinforcing flat plate 15 is in contact with the surface of one base end portion 9 and is detachably fixed by the four hexagon socket head bolts 16. The third shape is the same as that of the tubes 2 and 2 (which may be different) and the same size (any size as long as it can be clamped). The auxiliary clamping member 17 that clamps and fixes the tube 2 is spaced apart in a direction orthogonal to the flat plate 15 (vertical direction in the figure) to release the holding of the tube and approach the flat plate 15 closer to the tube 15 The holding posture for holding and holding 2 is provided so that the posture can be freely changed using a hexagon socket head bolt 18. The auxiliary clamping member 17 includes a base end portion 19 having a substantially rectangular shape in plan view that is fixed to the flat plate 15 by the hexagon socket head cap bolt 18, and a substantially rectangular shape in plan view in which the lateral width is substantially halved from the base end portion 19. And a tip portion 20 provided with a convex portion 2C on the inner surface of the tube 2 and a concave / convex portion 20A that engages with the concave portion 2D on the lower surface that is a sandwiching side surface. As described above, by attaching the reinforcing flat plate 15 to the surface of the base end portion 9 in a detachable manner, when the two tubes 2 and 2 are sandwiched, the flat plate 15 can be removed and used. Thus, there is an advantage that the tube pulling jig 3 can be configured to hold the tube 2 between two and three, but the flat plate 15 is welded to the surface of the base end portion 9 by welding or the like. It may be completely fixed. As shown in FIG. 9A, in the state where the three tubes 2 are sandwiched, the shape (indicated by a two-dot chain line) 24 connecting the shaft cores 21, 22, 23 of the tubes 2, 2, 2 is almost The dimensions of the tube drawing jig 3 are set so as to draw an equilateral triangle. The other members not described in FIGS. 5 to 9 are the same as those shown in FIGS.
[0020]
The case where the three tubes 2, 2, 2 are sandwiched and fixed by the tube drawing jig 3 configured as described above will be described. First, the shackle pin 4 </ b> P is loosened to remove the shackle 4 as described above. Is removed from the tube drawing jig 3 so that the free ends of the two holding members 7 and 8 are slightly opened and the holding portions 11 and 12 are inserted into the two tubes 2 and 2. Next, the concavo-convex portions 7A and 8A of the clamping members 7 and 8 are forcedly swung using a tool or the like on the side where the tubes 2 and 2 are pulled toward each other, so that the concave and convex portions 7A and 8A of the clamping members 7 and 8 are After making the state of being strongly locked (engaged) with the convex portion 2C and the concave portion 2D, the shackle 4 is connected to the tube pulling jig 3, so that the concave and convex portions 7A, 8A of the clamping members 7, 8 The two pipes 2 and 2 are clamped and held by the pipe pulling jig 3 while the engagement between the convex parts 2C and the concave parts 2D of the pipes 2 and 2 is maintained.
Thereafter, the hexagon socket head cap bolt 18 is loosened and the tube 2 is inserted between the concavo-convex portion 20A of the auxiliary clamping member 17 and the upper surface of the flat plate 15, thereby making the auxiliary clamping member 17 as shown in FIG. The concave and convex portion 20A is locked to the convex portion 2C and the concave portion 2D of the tube 2. Next, the hexagon socket head cap screw 18 is securely tightened with a tool to hold the locked state, and the third tube 2 is clamped and fixed, so that the three pipes 2 are held by the pipe drawing jig 3. , 2 and 2 are held. In FIG. 9B, the two tubes 2 and 2 are clamped and fixed by positioning the clamping position of the third tube 2 closer to the pulling side (tip side) than the other two tubes 2 and 2. After that, there is an advantage that the third tube 2 can be easily clamped and fixed, but all three tubes may be in the same clamping position.
[0021]
【The invention's effect】
According to claim 1, the pair of holding members that can hold the pipe drawing jig into the inside of the two pipes and pull the pipes together so that the outer surfaces of the pipes are in contact with each other. By constructing from the above, not only can the two tubes be connected and held without gaps, but they can be smoothly inserted into the underground tube, and both tubes can be connected by simply sandwiching the two tubes. Therefore, it is possible to provide a pipe pulling jig that can speed up the connecting operation.
[0022]
According to claim 2, each of the clamping members is provided with the convex portions and concave portions of the inner surface of the tube by being provided with the convex portions and concave portions of the inner surface of the tube along with the pulling operation of the tube. The concavo-convex portions of each clamping member can be locked to them, and the clamping member can be reliably prevented from coming off the pipe as compared with the one that prevents the detachment by frictional force.
[0023]
According to the third aspect, the pair of clamping members are pivotally connected around the axis substantially perpendicular to the pulling direction of the pipe, thereby swinging the pair of clamping members inserted into the two pipes around the axis. It is possible to draw both pipes by simply making them, and the operation can be performed more quickly than in the case of a configuration in which they are drawn by sliding.
[0024]
According to the fourth aspect, since the base end portions are overlapped with each other, the strength of the base end portions can be improved, and the corresponding thickness can be reduced to reduce the weight. In addition, since the pair of sandwiching portions are positioned at substantially the same level, it is possible to concentrate the sandwiching force on the tube in one place, making it difficult to remove the sandwiching portion from the tube, and the structure is highly reliable. be able to.
[0025]
According to claim 5, in a state where two pipes are sandwiched between a pair of clamping members, the maximum outer shape portion of the pipe in the direction of drawing the pipe in the tube axial direction view and the pipe in the direction substantially perpendicular to the drawing direction. By setting the dimension so that the holding member does not protrude from the maximum outer shape portion, when the two pipes are inserted and inserted into the underground pipe, the holding member is already disposed in the underground pipe. Therefore, it is possible to reduce contact with other objects such as a pipe, and to achieve high reliability without releasing the clamping state with the pipe.
[0026]
According to the sixth aspect, by fixing the flat plate to the surface of the one base end portion, the base end portion can be reinforced, but the auxiliary clamping member can be attached, and the member can also be used. The cost can be reduced by the conversion. Moreover, if the said flat plate is detachably fixed to the surface of one base end part, a flat plate can also be removed and used.
[0027]
According to the seventh aspect, the third tube is detached from the auxiliary clamping member by providing the convex portion and the concave portion engaging with the concave portion on the inner surface of the tube on a part or all of the clamping side surface of the auxiliary clamping member. Can be prevented by the locking action, and the reliability can be improved as compared with the case of preventing the detachment by the frictional force.
[0028]
According to claim 8, in the state where the three pipes are clamped using the pipe pulling jig according to claim 5 or claim 6, the shape connecting the axial cores of the pipes is substantially equilateral triangle. By setting it so that it can be drawn, the three tubes can be integrated in the most compact state, and there is little contact with other objects when retracted, improving the reliability that is difficult to come off and the handling surface. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state immediately before two pipes are sandwiched by a pipe drawing jig and inserted into an underground pipe.
FIG. 2 is an exploded perspective view of a pipe drawing jig.
FIG. 3A is a plan view with a partial cross section showing a state immediately before two pipes are held by a pipe drawing jig, and FIG. 3B is a plan view showing two pipes for pipe drawing. It is the top view made into the partial cross section which shows the state clamped with the tool.
FIG. 4A is a side view with a partial cross-section showing a state in which two pipes are held by a pipe drawing jig, and FIG. 4B is a drawing showing two pipes used as a pipe drawing jig. It is the front view made into the partial cross section which shows the state clamped.
FIG. 5 is a perspective view showing a state immediately before two tubes are sandwiched and inserted into an underground tube by a tube drawing jig capable of sandwiching three tubes.
6 is an exploded perspective view of the tube drawing jig shown in FIG.
7 shows the pipe pulling jig shown in FIG. 5, wherein (a) is a side view thereof, and (b) is a longitudinal side view thereof.
8 shows the pipe drawing jig shown in FIG. 5, wherein (a) is a rear view thereof and (b) is a plan view thereof. FIG.
9 shows a state where three pipes are clamped by the pipe drawing jig shown in FIG. 5, (a) is a front view thereof, and (b) is a side view thereof. FIG.
FIG. 10 is a plan view showing a conventional pipe drawing jig.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underground pipe 2 Pipe 2A, 2C Convex part 2B, 2D Concave part 2E, 2F Maximum external part 3 Pipe drawing jig | tool 4 Shackle 4A Shackle body 4B Through-hole 4C Female thread part 4D Tip male thread part 4P Shackle pin 5 Swivel 6 Steel wire 7, 8 Clamping member 7A, 8A Concave portion 7B, 8B Convex portion 7C, 8C Concave portion 9, 10 Base end portion 11, 12 Clamping portion 13, 14 Connecting portion 15 Flat plate 16 Hexagon socket head bolt 17 Auxiliary clamping member 18 Hexagon socket head cap bolt 19 Base end portion 20 Tip portion 20A Concavity and convexity portions 21, 22, 23 Shaft core 24 shape 30 Pipe 31 Connection ring portion 32 Connection fitting 33 Pull member 34 Connection hook 35 Wire P Hinge bolt N Nut W Washer

Claims (8)

Two pipes of an annular shape or a spiral shape having a diameter smaller than that of the underground buried pipe and in which convex portions and concave portions are alternately positioned in the axial direction of the pipe are simultaneously disposed in the underground buried pipe. In the pipe drawing jig for installing, it comprises a pair of clamping members that can respectively enter the inside of the two pipes and pull each other's pipes and hold the outer surfaces of the pipes in contact with each other A pipe drawing jig. The pipe pulling jig according to claim 1, wherein each holding member is provided with a convex part on the inner surface of the pipe and a concave and convex part to be engaged with the concave part as the pipe is pulled. The pipe pulling jig according to claim 1 or 2, wherein the pair of holding members are pivotally connected around an axis substantially perpendicular to a direction in which the pipe is pulled. The pair of clamping members are extended to the distal end side from a base end portion of substantially the same shape overlapped in the axial direction, and from the outer side in the width direction of each of the base end portions, and the uneven portion is Each of the sandwiching portions, and in the sandwiched state of the pair of sandwiching portions, at least one of the sandwiching portions and the base end portion extending from the at least one sandwiching portion are connected so that at least the concavo-convex portions are positioned at substantially the same level. The pipe drawing jig according to any one of claims 1 to 3, comprising a connecting portion. In a state in which two pipes are sandwiched between the pair of clamping members, the tube protrudes from the maximum outer shape portion of the tube in the direction of drawing the tube and the maximum outer shape portion of the tube in a direction substantially perpendicular to the pulling direction when viewed in the tube axis direction. The jig for tube pulling in any one of Claims 1-4 formed by setting this clamping member to the dimension which does not have. A reinforcing flat plate is fixed in contact with the surface of the one base end portion, and another flat tube having the same shape as or different from the tube is sandwiched between the flat plate and the flat plate. The auxiliary clamping member to be fixed is provided so that the posture can be freely changed between a releasing posture in which the tube can be released by being separated from the flat plate and a holding posture in which the tube is held close to the flat plate. The pipe pulling jig according to claim 4. The pipe pulling jig according to claim 6, wherein a convex part and a concave part engaging with the concave part of the inner surface of the pipe are provided on a part or all of the clamping side surface of the auxiliary clamping member. In a state where three pipes are clamped using the pipe pulling jig according to claim 6 or 7, the shape connecting the axial cores of the pipes is set so as to form an equilateral triangle. Pipe drawing jig.

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