JP2011163434A - Caster for jacking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight of a caster for a jacking method and to cope with pipes of various outer diameters. <P>SOLUTION: The caster for the jacking method is used fixed to the outer periphery of the pipe P for the movement of the pipe P within a sheath pipe S when laying the pipes P in the sheath pipe S while inserting a spigot 1 of one pipe P into a socket 2 of the other pipe P to join them. The caster includes: a belt 11 made of fiber and wound around the outer periphery of the pipe P; a pedestal 12 fixed to the belt 11; and a wheel 13 rotatably fixed to the pedestal 12. The wheel 13 is fixed rotatably along the pipe axis direction of the pipe P by tightening the belt 11 to the outer periphery of the pipe P. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a caster for a propulsion method that is attached to a new pipe having a smaller diameter than that of the sheath pipe in a sheath pipe buried in the ground.

  Various fields such as water and sewage, agricultural water, and industrial water are buried in the ground. In recent years, these pipelines have become obsolete and need to be renewed.

  This renewal generally employs an excavation method in which a pipe is embedded by excavating the ground. However, due to recent traffic conditions and the construction of complex pipelines in the city center and the like, it is difficult to newly construct pipelines by the open-cut method or to replace old pipelines. For this reason, the sheath tube propulsion method and the pipe-in-pipe method are employed as methods that replace the open-cut method.

  In the sheath pipe propulsion method, the start pit and the access pit are excavated on the ground, and from that start pit, first, a fume pipe or steel pipe is propelled and buried in the ground as a sheath pipe. This is a construction method in which new pipes having a diameter smaller than the sheath diameter are sequentially inserted from the (starting pit) to the other end (arrival pit) while being joined together. This construction method is usually adopted for the construction of new pipelines.

In addition, the pipe-in-pipe method uses existing pipes buried in the ground as sheath pipes, and in the existing pipes, as with the above-mentioned sheath pipe propulsion method, a hydraulic jack or the like has a smaller diameter than the existing pipe diameter. It is a method of inserting new pipes one after another while splicing new pipes.
In addition, since the existing pipe in this pipe-in-pipe construction method is also one of the sheath pipes, a new pipe is inserted into the sheath pipe as described in the above-mentioned sheath-pipe construction method, pipe-in-pipe construction method, etc. The construction method with a heavy pipe structure is collectively referred to as “sheath tube propulsion construction method”.

  In this sheath pipe propulsion method, since the new pipes are sequentially inserted from the start pit as described above, a caster for the propulsion method is used so that the new pipe can easily move in the sheath pipe.

  As a caster for this propulsion method, for example, as shown in Patent Documents 1 and 2, a plurality of arc-shaped members called saddles are fixed along the outer periphery of the new pipe to form an annular shape. Some have wheels (rollers) attached. With this wheel, the new pipe can move while rolling in the sheath pipe (for example, see Patent Documents 1 and 2).

  Moreover, as shown in Patent Document 3, there is a type in which a caster unit having wheels (rollers) is fixed to the new pipe with a chain wound around the outer circumference of the new pipe (for example, see Patent Document 3).

JP 2003-269082 A Japanese Patent Laid-Open No. 2003-14160 JP 2009-13727 A

  In this type of sheath tube propulsion method, the jig such as the saddle used for the caster for the propulsion method is generally made of metal. Accordingly, when used for a large-diameter pipe, the jig size also increases in accordance with the diameter. As the jig size increases, the weight increases, which affects workability. Moreover, since the attachment of this jig is an operation in a narrow start shaft (vertical shaft), it can be said that the deterioration of workability has a great influence.

  Moreover, according to this propulsion method caster, there is a problem that a separate saddle or the like must be prepared for each pipe body having a different outer diameter. This is because if the outer diameter of the tubular body is different, the curvature of the outer peripheral surface is also different, so that the same saddle cannot be adhered to the outer peripheral surface of the tubular body.

  In this respect, according to the propulsion method caster described in Patent Document 3, since the chain is used instead of the saddle, it is possible to cope with pipe bodies having different outer diameters. However, an increase in weight that occurs when used for a large-diameter pipe is inevitable.

  Accordingly, an object of the present invention is to reduce the weight of the propulsion method caster and to be able to cope with pipes having various outer diameters.

  In order to solve the above-described problems, the present invention provides a method for inserting a pipe insertion port into a receiving port of another pipe and joining the pipes in the sheath pipe while laying the pipes in the sheath pipe. In the propulsion method caster that is used by being fixed to the outer periphery of the pipe for movement in the above, a fiber belt wound around the outer periphery of the pipe, a pedestal fixed to the belt, and a pedestal And a wheel that is rotatably fixed, and the belt is fastened to the outer periphery of the tube so that the wheel is rotatably fixed along the tube axis direction of the tube.

Conventionally, the caster for the propulsion method, which has been mainly made of metal, can be reduced in weight by using a fiber belt as a member attached to the outer periphery of the pipe. As the fibers of this material, for example, high-performance fibers can be used. Further, since a fiber belt is a flexible material, it can be used in common for pipes having different outer diameters. At this time, the length of the belt and the number of wheels can be appropriately increased or decreased.
Moreover, since it is a flexible material, it can be compacted by folding or rolling it during transportation, and a large space is not required when working in a vertical shaft.

  In this configuration, the pedestal is made of metal, and the pedestal is located between a protrusion provided on the outer periphery of the insertion port and a pipe end surface of the receiving port, and the protrusion and the tube are interposed via the pedestal. The driving force can be transmitted between the end faces.

When propelling the tube into the sheath tube, it is possible to transmit the propulsive force by the end surface of the insertion tube hitting a step provided in the inner part of the receiving port. Since the propulsive force is transmitted also through the metal pedestal, the pedestal is firmly fixed between the projection and the pipe end face of the receiving port. For this reason, the rolling of the wheel with respect to the inner surface of the sheath tube becomes smooth.

  Further, in each of these configurations, the belt is wound around the outer periphery of the tube, and the belt can be fixed in a state of being fastened to the outer periphery of the tube by a fastening unit. The structure provided with the fastening hole which penetrates a belt to the front and back, and the pin penetrated by the fastening hole is employable. Moreover, the structure provided with multiple this fastening hole along the longitudinal direction of the said belt can be employ | adopted.

  As a fastening means comprising this fastening hole and a pin, for example, in the state where the belt is wound around the outer periphery of the tube, between the end portions of the belt facing the circumferential direction of the tube, another fastening member, for example, a resin, It is possible to adopt a structure and method that spans a fastening plate made of metal or the like. According to this, the positions of the fastening holes provided in the fastening plate so as to penetrate the front and the back and the fastening holes penetrating the front and back provided at both ends of the belt are aligned, and common to both of the aligned fastening holes. By inserting the pin, both ends of the belt can be connected via the fastening plate, and the belt can be fixed in a tightened state around the pipe.

  Further, for example, when the belt is wound around the outer circumference of the pipe in a ring shape with an overlap margin in the circumferential direction, the position of the fastening holes penetrating the front and back provided in the overlapped belt in the overlap margin is determined. A structure and a method may be employed in which a common pin is inserted into both of the aligned fastening holes.

  In the case of using these fastening holes and pins, the belt length can be adjusted by adopting a configuration in which a plurality of fastening holes provided in the belt and the fastening member are provided along the longitudinal direction of the belt. Can also be used for pipes with a diameter.

  Further, as a fastening means having another configuration, the belt is wound around the outer periphery of the tube in an annular manner with an overlap margin in the circumferential direction, and is fastened to the outer periphery of the tube by a fastening means provided at the overlap margin. The fastening means can adopt a configuration that exerts a function of preventing loosening by increasing the friction of the contact portion between the belts with the overlapping overlap.

  As a means for increasing the friction at the contact portion between the belts, for example, a mechanism for closely contacting the belts in the thickness direction can be employed. As an example of this, there is means for pressing the overlapped belts together using a screw mechanism or a link mechanism and fixing them in close contact. Alternatively, a well-known buckle (clasp) structure for fixing various belts used in bags, clothes, and the like can be employed.

  As a structure of the buckle, for example, a long hole that gradually approaches the belt surface along the longitudinal direction of the belt is provided on the side surface (side surface with respect to the belt width direction) of the cylindrical buckle through which two belts are inserted. A structure in which a pin is inserted into the hole, and the pin is moved along the long hole and pressed against the belt surface, so that the pin is engaged with the belt surface and the edge of the long hole and fixed in a close contact state. Can be adopted.

  Since the fiber belt is used as means for fixing the wheel to the outer periphery of the pipe, the present invention can reduce the weight of the caster for the propulsion method and can cope with pipe bodies of various outer diameters.

Whole front view showing construction state of one embodiment AA sectional view of FIG. Enlarged view of the main part showing details of the caster part (A) is a side view of FIG. 3, (b) is a side view showing a modification of (a). The principal part enlarged front view which shows the positional relationship with a receptacle, an insertion port, and a caster part The detail of a fastening means is shown, (a) is a top view, (b) is a front view, (c) is a front view which shows the case where the length of a belt is made longer than (b). Front view showing another example of fastening means

  An embodiment will be described with reference to the drawings. This embodiment is a propulsion method caster 10 that is fixed to a new pipe P in a sheath pipe propulsion method in which a new pipe P (pipe P) is inserted into the sheath pipe S to form a pipe line.

  In the sheath tube propulsion method, as shown in FIG. 1, the insertion port 1 of the new tube P is inserted into the receiving port 2 of another new tube P inserted in advance in the sheath tube S, and the new tubes P are connected to each other. These new pipes P will be promoted into the sheath pipe S. When the propulsion method caster 10 is pulled down into the shaft which is the starting pit so that the new pipe P can travel in the sheath pipe S during this propulsion, the outer circumference of the new pipe P Fixed to.

  As shown in FIGS. 1 and 2, the propulsion method caster 10 includes a fiber belt 11 wound around the outer periphery of the new pipe P, a caster portion having wheels 13, and fastening means for fastening the belt 11. 20 mag. The caster part includes a pedestal 12 fixed to the belt 11 and wheels 13 fixed to the pedestal 12 so as to be rotatable.

As shown in FIGS. 3 and 4A, the pedestal 12 includes a recess 12 c that accommodates the wheel 13, and is joined to the belt 11 so that the inner surface 12 a of the pedestal 12 is in contact with the outer surface of the belt 11. Yes.
In this embodiment, an adhesive is interposed between the inner surface of the pedestal 12 and the outer surface of the belt 11, but other methods such as screwing or fitting may be employed.

  The wheel 13 has a shaft 13a fitted into a bearing portion in the recess 12c of the pedestal 12, and is supported rotatably around the shaft 13a.

In the embodiment of FIG. 4A, the shape of the pedestal 12 is formed such that the inner surface 12a thereof is V-shaped in a cross section orthogonal to the tube axis direction. For this reason, the edge 12b of the inner surface 12a bites into the belt 11, and the joining degree of both is enhanced.
For example, as shown in FIG. 4 (b), the shape of the pedestal 12 is formed so that the inner surface 12a thereof has an arcuate shape (cylindrical shape) in a cross section orthogonal to the tube axis direction. It can also be increased.

  The belt 11 is provided with fastening means 20. As shown in FIGS. 3 and 6, the fastening means 20 includes a fastening hole 21 penetrating the belt 11 on the front and back sides and a pin (22) inserted through the fastening hole 21. A fastening plate 23 is provided as a fastening member. The fastening plate 23 is also provided with a fastening hole 21 penetrating the front and back. Hereinafter, the fastening hole 21 of the belt 11 is denoted by reference numeral 21b, and the fastening hole 21 of the fastening plate 23 is denoted by reference numeral 21a.

A plurality of fastening holes 21b of the belt 11 and fastening holes 21a of the fastening plate 23 are provided along the longitudinal direction and the width direction of the belt, respectively.
The fastening holes 21 b of the belt 11 are provided at equal intervals in each direction along the longitudinal direction and the width direction of the belt 11. The fastening holes 21a of the fastening plate 23 are also provided at equal intervals along the longitudinal direction and the width direction at the same intervals as the fastening holes 21b of the belt 11 in each direction.

  A description will be given of the mounting structure and mounting method of the propulsion method caster 10 to the new pipe P. The belt 11 is wound around the outer periphery of the new pipe P.

In this state, as shown in FIGS. 6A and 6B, the fastening plate 23 is bridged between the end portions of the belt 11 facing the circumferential direction of the new pipe P.
Then, the positions of the fastening holes 21 a of the fastening plate 23 and the fastening holes 21 b at both ends of the belt 11 are aligned while pulling by applying force between the both ends of the belt 11. By inserting one common pin 22 into the aligned fastening holes 21a and 21b, both ends of the belt 11 are connected via the fastening plate 23, and the belt 11 is tightened around the new pipe P. It can be fixed to the state.

  By tightening and fixing the belt 11, the wheel 13 of the base 12 is fixed so as to be rotatable along the tube axis direction of the new pipe P.

  At this time, a plurality of fastening holes 21 b of the belt 11 are provided along the longitudinal direction of the belt 11. For this reason, for example, as shown in FIG. 6C, the length of the belt 11 in the state wound around the new pipe P by shifting the fastening hole 21b through which the pin 22 is inserted in the longitudinal direction. Adjustment is possible. For this reason, it is possible to deal with new pipes P having different outer diameters with the same belt 11.

  A plurality of fastening holes 21 a of the fastening plate 23 are also provided along the longitudinal direction of the belt 11. For this reason, similarly, it is possible to cope with new pipes P having different outer diameters by the same belt 11 by shifting the fastening holes 21a through which the pins 22 are inserted in the longitudinal direction.

FIG. 5 shows a state in which the propulsion method caster 10 is fixed to the new pipe P. In addition, the shape of the receptacle 2 and the insertion slot 1 is not limited to what is illustrated.
In FIG. 5, the pedestal 12 is made of metal, and the pedestal 12 is positioned between the end surface 3a of the projection 3 provided on the outer periphery of the insertion port 1 of the new pipe P and the tube end surface 2a of the receiving port 2. And it is in the state which touched each end face 2a and 3a.

For this reason, a propulsive force is transmitted between the projection 3 and the pipe end surface 2a via the pedestal 12.
That is, since the pedestal 12 is made of metal, the propulsive force is transmitted through the pedestal 12. Further, the pedestal 12 is firmly fixed between the end surface 3 a of the protrusion 3 and the pipe end surface 2 a of the receiving port 2, so that the rolling of the wheel 13 is stabilized.

According to the propulsion method caster 10, the member attached to the outer periphery of the new pipe P is the fiber belt 11, so that the weight can be reduced. Moreover, since it is the fiber belt 11, it is a flexible material and can be used in common for pipes having different outer diameters. At this time, the length of the belt 11 and the number of wheels 13 can be appropriately increased or decreased.
Moreover, since it is a flexible material, it can be folded and rolled down during transportation, and a large space is not required when working in a shaft.

  In this embodiment, high-performance fibers are used as the fibers of this material, but other materials may be used as long as a predetermined strength can be ensured.

  Another embodiment is shown in FIG. In this embodiment, the belt 11 is wound around the outer circumference of the new pipe P in a ring shape with an overlap margin W in the circumferential direction, and the belt 11 is connected to the new pipe P by the fastening means 20 provided in the overlap margin W. It is fastened and fixed to the outer periphery.

  As shown in FIGS. 7A and 7B, the fastening means 20 uses a buckle 24 into which the overlap margin W of the belt 11 is inserted.

The buckle 24 has a front surface member 24b and a back surface member 24c, and side members 24f that connect the front surface member 24b and the back surface member 24c on both sides in the width direction (the width direction of the inserted belt 11).
The buckle 24 has openings 24d and 24d on both sides along the longitudinal direction of the belt 11, and the two belts 11 and 11 having the overlap margin W are disposed between the openings 24d and 24d at both ends. The surface member 24b and the back surface member 24c are inserted.

The side members 24f and 24f on both sides of the buckle 24 are provided with elongated holes 24a that gradually approach the belt surface along the longitudinal direction of the belt 11, respectively.
Both ends of one lock pin 25 are inserted into the long holes 24a, 24a. The lock pin 25 includes a large number of protrusions 25a in the middle of the length direction.

In the buckle 24, that is, between the openings 24d and 24d, a portion of the overlap margin W of the belts 11 and 11 is inserted between the front surface member 24b and the back surface member 24c.
In this state, when the lock pin 25 is moved from the position shown in FIG. 7 (a) to the position shown in FIG. 7 (b) along the elongated hole 24a as indicated by an arrow a, the lock pin 25 is Pressed against the belt surface. By this pressing, the lock pin 25 is locked in a state where it is engaged with the belt surface and the edge of the elongated hole 24a.

  At this time, since the protrusion 25a is present on the surface of the lock pin 25, the protrusion 25a bites into the belt surface, and the effect of preventing the loosening is enhanced.

  Thereby, the part of the overlap margin W of the belts 11 and 11 is fixed to the contact state between the lock pin 25 and the inner surface 24e of the back surface member 24c. That is, the function of preventing loosening is exhibited by increasing the friction of these close contact portions.

For example, if the one located on the front side (the side closer to the lock pin 25) of the overlapping belts 11 is pulled in the direction of the arrow b shown in FIG. 7B, the degree of biting of the lock pin 25 increases and further loosening occurs. Stop function is demonstrated.
When loosening the fastening, the lock pin 25 may be moved in the direction opposite to the arrow a, or the overlapping belt 11 positioned on the front side may be pulled in the direction of the arrow c.

  In these embodiments, the new pipe P is constituted by a tubular body having a circular cross section. However, as this tubular body, a pipe having a shape other than a circular cross section can be adopted. For example, it may be a tube having a square cross section (such as a square cross section), a tube having a horseshoe shape in cross section, or a tube having any other cross section.

1 Insert 2 Receptacle 2a End face 3 Protrusion 3a End face P Tube (new tube)
S sheath tube 10 caster 11 for propulsion method belt 12 base 12a inner surface 12b edge 12c recess 13 wheel 13a shaft 20 fastening means 21, 21a, 21b fastening hole 22 pin 23 fastening member (fastening plate)
24 Buckle 25 Lock pin

Claims (5)

When inserting the pipe (P) into the sheath pipe (S) while inserting the pipe (P) into the receptacle (2) of another pipe (P) and joining them together, In order to move the pipe (P) in the sheath pipe (S), the caster for the propulsion method used by being fixed to the outer periphery of the pipe (P),
A fiber belt (11) wound around the outer periphery of the pipe (P), a pedestal (12) fixed to the belt (11), and a wheel rotatably fixed to the pedestal (12) ( 13), and the belt (11) is fastened to the outer periphery of the pipe (P), so that the wheel (13) is rotatably fixed along the pipe axis direction of the pipe (P). The caster for propulsion method characterized by   The pedestal (12) is made of metal, and the pedestal (12) is disposed between a protrusion (3) provided on the outer periphery of the insertion port (1) and a pipe end surface (2a) of the receiving port (2). The propulsion method caster according to claim 1, wherein a propulsion force is transmitted between the projection (3) and the pipe end surface (2a) through the pedestal (12).   The belt (11) can be fixed to the outer periphery of the pipe (P) by fastening means (20), and the fastening means (20) The caster for propulsion method according to claim 1 or 2, comprising a fastening hole (21) that penetrates and a pin (22) that is inserted into the fastening hole (21).   The caster for propulsion method according to claim 3, wherein a plurality of the fastening holes (21) are provided along a longitudinal direction of the belt (11).   The belt (11) is annularly wound around the outer periphery of the pipe (P) with an overlap margin (W) in the circumferential direction, and the pipe (P) by fastening means (20) provided at the overlap margin (W). ), And the fastening means (20) increases the friction of the contact portion between the belts (11, 11) with the overlapping allowance (W). 3. The propulsion method caster according to claim 1 or 2, wherein the caster for propulsion method exhibits a function of preventing loosening.

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