JP2000170956A - Pull-in device, coupler and pull-in method using the same pull-in device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably poll a rod connecting a working member of an existing pipe renewing device to a tip part into an arrival pit under substantially constant tension. SOLUTION: This pull-in device is constituted by being provided with a pair of pull-in cylinders 11 and a pair of reaction receiving cylinders 2 arranged on the upper and lower sides of each pull-in cylinder 11. The pull-in cylinders 11 are connected by frames 16, 17. A rod 11a of each pull-in cylinder 11 is provided with a carriage 13 and this carriage 13 is provided with a holding member 19 holding a transmission member 14. A through hole 17c of the frame 17 is provided with a clamping member 18 for clamping a tip part of an existing pipe 4 and integrating the pipe 4 and the pull-in device and is provided with a renewing device 3 and a locking member 15 locking a coupler 2 connecting rods 1 with which new pipes 5 are connected to each other. In a state that the transmission member 14 is engaged to a groove 2a formed at the coupler 2, the pull-in cylinders 11 are driven, the carriage 13 is moved by a distance corresponding to the length of each rod 1 and each rod 1 is pulled in an arrival part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retracting device for pulling a rod, which is provided between a start side and a reaching shaft and connects a working member including a pipe to be newly buried at an end thereof, to the reaching shaft side, The present invention relates to a coupler which is advantageous for connecting a rod drawn by the retracting device.

[0002]

2. Description of the Related Art Many pipelines are laid underground, such as a gas pipeline for flowing fuel gas and a water pipeline for flowing clean water. In these pipelines, the interior of the pipeline may be surveyed for the purpose of maintenance of the pipeline, or the pipeline may be updated with an increase in the line population. In particular, recently, the force acting during an earthquake may break the pipe joints or other parts and cause leakage, which may cause a major disaster. Replacement with a flexible synthetic resin tube has been performed.

When replacing a pipe buried underground with a new pipe, a method of digging a road along an existing pipe may be adopted. However, this method may adversely affect the traffic situation in the surrounding area, and recently, a tunnel is formed by cutting the existing pipe vertically and expanding its diameter, and a new pipe is drawn into this tunnel and replaced. Technology has been proposed.

For example, the technique disclosed in Japanese Patent Application Laid-Open No. 2-266185 relates to an "existing pipe laying change device", which includes a clamp device for pressing an existing pipe inner wall and a notch for providing a notch in the axial direction of the pipe inner wall. A cutter, a moving cylinder arranged to expand and contract in the pipe axis direction, and a pipe expanding device that splits and expands a notch are connected in a line, and a new pipe is connected to a rear portion of the pipe expanding device. In this technology, by driving the moving cylinder by pressing the inner wall of the tube by the clamp device, the functional unit connected behind the clamp device is moved to form a notch in the inner wall of the tube and draw in the new tube, The tube expansion device is driven to split the notch and expand the tube.

[0005]

In the above technique, a plurality of hydraulic devices are used in a clamping device, a moving cylinder, or a tube expanding device. For this reason, the equipment is inevitably increased in size and cannot be applied to existing pipes of small diameter.Although existing pipes can be replaced with new pipes in one process, the progress of equipment and new pipes Is like a scale insect,
There is a problem that it takes a lot of construction time per unit length.

Therefore, the present applicant has developed a “pipe renewal method and apparatus” for renewing a cast iron pipe buried underground to a synthetic resin pipe in order to solve the above-mentioned problem, and has already applied for a patent. (Japanese Patent Application No. 9-98889). In this application, the problem is solved mainly by expanding the diameter of the cast iron pipe by torn in the axial direction and drawing the synthetic resin pipe into the expanded area. However, there is no solution to a device for pulling a device for expanding a diameter by breaking a cast iron pipe to a reaching shaft side.

[0007] When pulling a rod having an apparatus for breaking and expanding the diameter of a cast iron tube at the end to the reaching shaft side, a relatively large tension is applied to the rod depending on the resistance at the time of breaking by the apparatus. Acts, and elongation occurs according to this tension. Therefore,
If a single rod is removed from a long rod to which a large number of connected rods are removed, if the tension applied to the rod is removed, the elongation of the rod will be removed. The position of the seam will change.

For this reason, it is difficult to specify a portion for transmitting the tension to the rod when the rod is pulled, which causes a problem that the working member cannot be pulled in with a stable stroke. In addition, every time the retraction of the working member corresponding to the unit length of the rod is completed, if the tension acting on the rod changes significantly, an impact force acts on the cutter that forms the cutting groove in the cast iron pipe. Another problem is that the cutter is easily damaged.

[0009] An object of the present invention is to connect a predetermined working member to the end and to extend a rod disposed in the ground toward a reaching shaft, even if the rod is stretched. An object of the present invention is to provide a retracting device that can pull the rod with a constant stroke in a stable state.

[0010]

In order to solve the above-mentioned problems, a retracting device according to the present invention is provided between a starting side and a reaching shaft, has a predetermined length, and is linearly arranged. A retraction device that connects a predetermined working member to an end and connects a plurality of rods connected to each other via a coupler to a reaching shaft side, and a retraction cylinder arranged along a retraction direction, A reaction force receiving cylinder disposed along the retraction cylinder, a carriage driven by the retraction cylinder to reciprocate linearly, and a transmission member mounted between the carriage and the rod for transmitting the linear motion of the carriage to the rod. And a locking member provided at a predetermined position for locking by engaging with a coupler connected to a rod, and moving the carriage from the upstream side to the downstream side in the retraction direction. At the time of transmission, the pulling force is transmitted from the carriage to the rod via the transmission member to pull the rod, and when a predetermined retraction stroke is completed, the locking member engages with the coupler to lock the rod, and further, The carriage is moved to the upstream side in the retraction direction while maintaining the locking state of the rod by the locking member, and after the carriage reaches the movement limit to the upstream side, the transmission member is interposed between the carriage and the rod. Thus, the rod is sequentially pulled.

In the above retracting device, the retracting cylinder is disposed along the retracting direction of the rod, and the reaction force receiving cylinder is disposed along the retracting cylinder. By attaching the transmission member to the rod, the driving force of the retracting cylinder can be transmitted to the rod and the rod can be pulled.

When the carriage is moved to the stroke limit by the retraction cylinder and the transmission member reaches a predetermined position on the downstream side in the retraction direction, the coupler connecting the rod passes through the locking member and is locked. For this reason, the rod on the upstream side in the retraction direction from the portion locked by the locking member will maintain the state in which the tension transmitted from the carriage acts, and the tension acting on the rod should be substantially constant. Can be done. The rod downstream of the locking portion is in a free state where no tension acts.

For this reason, the rod downstream of the locking portion is removed, and the carriage is moved in the direction opposite to the retraction direction, and the transmission member is mounted between the carriage and the new rod, and the new rod is inserted. Can be pulled.

Therefore, since a certain load can be applied to the working member connected to the rod, the working member can be any one selected from a cutter, a large diameter member, other tools, a new pipe, or the like. Even if it is, the impact load does not act, and there is no fear of breakage due to the impact load.

In the above retracting device, the rod is disposed inside an existing pipe buried in the ground.
In addition, it is preferable to provide a gripping member that grips the end of the existing pipe with a plurality of arc pieces.

In the case where the retraction device is configured as described above, the retraction device can be attached to the existing pipe by mounting and gripping the gripping member facing the pipe end of the existing pipe on the reaching shaft side. . In this case, since the axis of the split sleeve coincides with the axis of the existing pipe, the work can be performed while maintaining the state where the axis of the existing pipe and the axis of the carriage are aligned when the rod is pulled.

A coupler according to the present invention is a coupler for connecting a rod pulled by the retracting device, wherein a groove for engaging with the transmission member is provided on an outer peripheral surface.

In the above coupler, for example, a screw is formed on the rod, and the rod can be sequentially connected via the screw. By engaging the transmission member with the groove formed on the outer peripheral surface, a force can be transmitted from the carriage to the rod by the engagement, and the rod can be pulled.

Further, according to the drawing method of the present invention, a starting shaft and a reaching shaft are constructed at predetermined positions of a pipeline, and the drawing device according to claim 1 or 2 is installed in the reaching shaft, and drawn into an existing pipe. After reaching the start shaft by inserting a rod from the arrival shaft to the start shaft by the device, a working member for performing a predetermined operation on the existing pipe is connected to the tip of the rod, and thereafter, the carriage of the retracting device and The work member is retracted by driving the carriage in the retracting direction with the transmission member interposed between the rods, and after the retracting corresponding to the length of one rod is completed, the rod is temporarily engaged by engaging the locking member. , And then drive the carriage in the direction opposite to the retraction direction to face the temporarily locked rod and remove one rod. The transmission member is interposed and is characterized in that for driving the carriage in the retracted direction.

In the above-mentioned retraction method, after any one of the above-mentioned retraction devices is installed in the reaching shaft, a rod is inserted into the pipeline to reach the starting shaft using the retraction device, and the working member is attached. By pulling the rod toward the arrival shaft, predetermined work can be performed on the existing pipe.

In the above retraction method, when the retraction device according to claim 1 or 2 is installed in a reaching shaft constructed at a predetermined position in a pipeline, a rod of a reaction force receiving cylinder disposed along the retraction cylinder is used. In order to terminate the series of retraction operations, the reaction force receiving cylinder is extended to move the retraction cylinder downstream in the retraction direction, and the working member is retracted upstream in the retraction direction of the retraction cylinder. It is preferable to form a space.

As described above, when predetermined work on the existing pipe is completed and the work member arrives at the arrival shaft, the reaction force receiving cylinder is operated to move the retracting cylinder to the downstream side in the retracting direction. A large space can be formed on the upstream side in the retraction direction in the shaft, and at the same time, the movement limit of the carriage can be extended by the stroke of the reaction force receiving cylinder. For this reason, the working member connected to the tip of the rod can be reliably accommodated in the reaching shaft.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the above-mentioned retracting device will be described below with reference to the drawings, and a retracting method will be described together. 1 is a plan view of the retracting device according to the present embodiment, FIG. 2 is a side view of the retracting device, FIG. 3 is a front view of the retracting device, and is a view taken in the direction of arrows III-III in FIG. 1, and FIG. 5 is a partial cross-sectional view of a main part illustrating a state around the carriage, FIG. 5 is a partial cross-sectional view of a main part illustrating a state around the carriage when the rod is pushed, and FIG. 6 illustrates a procedure when the rod is pulled. FIG. 7, FIG. 7 illustrates a procedure for pulling a rod, FIG. 8 illustrates a configuration of a coupler, FIG. 9 is a side view illustrating a configuration when updating a pipe, and FIG. FIG. 3 is a plan view illustrating a configuration when performing the operation.

The retraction apparatus according to the present embodiment updates an existing pipe having a small diameter of about 75 A to 200 A, which is already buried in the ground, with a new pipe having the same diameter or a rank higher by one rank. It is configured to be able to perform advantageously an operation requiring a relatively large force, such as an operation for cleaning an existing pipe or an operation for burying a new pipe in the ground, or an operation for cleaning a new pipe in the ground.

In particular, a work member which is provided with a plurality of rods connected from the starting side to the reaching shaft and which can rationally carry out a work selected from the above works at one end of the rod. By pulling this rod toward the reaching shaft side with a constant stroke and maintaining the tension acting on the rod at a substantially constant value sufficient to perform the intended work, the working member is pulled with a substantially constant force. It is configured such that it can be moved to perform a desired operation.

The rod disposed in the ground is not particularly limited, and any rod that can withstand high tension and has appropriate flexibility can be used. In this embodiment, as shown in FIG. 1, a rod-shaped PC bar having a thread formed on the outer periphery and having a preset unit length is used as the rod 1, and the rod 1 is formed into a nut-like shape having a thread formed therein. Are connected by a coupler 2. That is, the rods 1 are connected to each other by the coupler 2 to form a long rod.

The working member connected to the end of the rod 1 is not particularly limited, and can be used for updating a pipeline buried underground, cleaning the pipeline, or performing other work. Is fine. In the present embodiment, as working members,
A case will be described in which an updating device used when updating an already laid pipe with a new pipe is used.

Prior to the detailed description of the retracting device, the updating device 3 connected to the end of the rod 1 will be described with reference to FIGS.
A method of updating a pipe for replacing an existing pipe 4 with a new pipe 5 will be schematically described. In this renewal method, for example, an existing pipe 4 buried in the ground to supply city gas or clean water is replaced with a new pipe 5 having the same diameter or a higher rank (for example, synthetic resin pipe, steel pipe, etc.). ).

In the figure, an updating device 3 is connected to an end of a rod 1, and a new tube, such as a polyethylene (PE) tube 5, is connected to the updating device 3. The updating device 3 is formed with a plurality of cutting grooves formed on the inner peripheral surface of the existing pipe 4 and a cutting part 3 a that cuts the existing pipe 4 to form a plurality of arc pieces by using the cutting grooves as a starting point. The enlarged diameter portion 3b which bends the arc piece to press-fit the ground at the same time as consolidating the ground.
And a connecting portion 3c for connecting the pipe 5, and a connecting portion 3d provided at an end of the cutting portion 3a for connecting the rod 1.

In the updating device 3, in the process of moving from the starting shaft 6 toward the reaching shaft 7 (retracting direction), a cutting groove formed in the inner surface of the existing pipe 4 is formed in the inner surface of the existing pipe 4 by a cutter provided in the cutting portion 3 a. At the same time, a plurality of arc pieces are formed by being cut by a roller, and the arc pieces are bent and expanded by an expanding roller provided in the enlarged diameter portion 3b. Further, a pipe 5 is inserted into the expanded arc piece. It is possible to pull in. Further, by applying a radial force to the branch member 8 attached to the existing pipe 3, tension is applied to the bolt 8a, and the bolt 8a is broken by this tension and the branch member 8 is pressed into the ground. It is possible. That is, in the process of moving the updating device 3 toward the arrival shaft 7 by the rod 1, it is possible to simultaneously tear and expand the existing pipe 4 and the branch member 8 and lay the new pipe 5.

After the update device 3 and the pipe 5 reach the arrival shaft 7, the connection between the update device 3 and the tube 5 is released, and the update device 3 is removed from the arrival shaft 7, so that a new pipe 5 is connected. It is possible to lay between the starting shaft 6 and the reaching shaft 7.

Next, a specific configuration of the retracting device according to the present embodiment will be described with reference to FIGS. The retracting device shown in the figure is installed in the reaching shaft 7 as shown in FIG. 9 and when updating the existing tube 4, first, the rod 1 is inserted into the existing tube 4 from the reaching shaft 7 to the starting shaft 6. The rod 1 is inserted while being connected by the coupler 2, and when the end of the rod 1 reaches the starting shaft 6, the updating device 3 is attached to the end.
Is connected to the rod 1 to connect the updating device 3 and the new pipe 5 to the rod 1. Thereafter, the rod 1 inserted into the existing pipe 4 is pulled in with a substantially constant stroke, and the updating apparatus 2
Is moved to the arrival shaft 7 side, and in this movement process, an operation of updating the existing pipe 4 to a new pipe 5 can be performed.

The retracting device comprises a pair of retracting cylinders 11 arranged along the retracting direction of the rod 1 (the direction of arrow a in FIG. 1), and a reaction force receiving cylinder 12 arranged vertically along each retracting cylinder 11. A carriage 13 driven by the retracting cylinder 11 and reciprocating linearly; a transmitting member 14 disposed between the carriage 13 and the rod 1 for transmitting a force accompanying the movement of the carriage to the rod 1; A frame 16 disposed upstream of the pair of retracting cylinders 11 and fixed to the retracting cylinder 11; a frame 17 disposed downstream of the pair of retracting cylinders 11 and fixed to the retracting cylinder 11;
17 is provided with a locking member 15 that engages with the coupler 2 and locks the coupler 2, and a gripping member 18 that is provided on the frame 17 and grips an end of the existing pipe 4. I have.

One end of two (four in total) reaction force receiving cylinders 12 arranged above and below the respective retracting cylinders 11 are connected to the frame 16 disposed upstream of the retracting cylinder 11 in the retracting direction. ing. Also frame
The legs 16a are provided with legs 16a connecting the two retracting cylinders 11 downward from portions corresponding to the retracting cylinders 11, respectively. Therefore, it is a portion corresponding to the frame 16,
The frame connecting the axis of each retracting cylinder 11
There are no 16 legs 16a.

A leg 17a is provided below the frame 17 on the downstream side in the retraction direction, and the legs 16a,
The retracting device is installed at a predetermined position of the arrival shaft 7 by grounding the 17a to the bottom of the arrival shaft 7. A connection member 17b is provided on the frame 17 along a line connecting the axes of the respective retracting cylinders 11, and a through hole 17c having a diameter sufficiently larger than the outer diameter of the existing pipe 4 is formed in the connection member. ing. A gripping member 18 for gripping the end of the existing pipe 4 exposed to the reaching shaft 7 is disposed on the upstream side in the drawing direction of the through hole 17c formed in the frame 17, and the locking member 15 is disposed on the downstream side.

A pair of retraction cylinders 11 is provided with a rod 11a.
Are arranged in parallel to the downstream side in the retraction direction, and are configured to exert a high retraction force when the rod 1 is retracted. Carriage by connecting each rod 11a
A carriage 13 is provided, and the carriage 13 reciprocates linearly with the extension and retraction of the rod 11a. By disposing the transmission member 14 between the carriage 13 and the rod 1 when the carriage 13 reciprocates linearly, a pulling force in the direction of arrow a or a pushing force in the direction of arrow b is applied to the rod 1. It is possible.

A contact plate 12b is provided by connecting rods 12a of a pair of reaction force receiving cylinders 12 arranged above and below the retraction cylinder 11, and the contact plate 12b is connected to the starting wall surface 7a of the arrival shaft 7. (See FIG. 9) so as to receive a reaction force when the rod 1 is pulled in. The reaction force receiving cylinder 12 does not simply have a function of simply receiving a reaction force when the existing pipe 4 is renewed. When the retraction of the rod 1 progresses and the updating device 3 arrives at the arrival shaft 7, the rod 12a Extend the retractable cylinder
It is possible to separate the frame 11 and the frames 16 and 17 from the wall surface 7a, and particularly to form a large space between the frame 17 and the wall surface 7a, and to draw the updating device 3 into this space.

That is, the pair of retracting cylinders 11 are opposed to each other with a distance sufficiently larger than the thickness of the updating device 3, and the frame 16 fixed to these retracting cylinders 11 is provided.
Has a connecting portion below the existing pipe 4. For this reason, a space in which the longitudinal direction is defined by each retracting cylinder 11 and the upper side is open is formed in the retracting device. Therefore, the length of this space in the longitudinal direction is
The extension device 3 is extended by extending the rod 12a.
Can be drawn into the arrival shaft 7. The rod 12a of the reaction force receiving cylinder 12 is extended to reach the vertical shaft 7.
When the distance between the wall surface 7a and the frame 17 is extended, the updating device 3 that has reached the arrival shaft 7 can be separated.

The carriage 13 has a pair of retractable cylinders 11.
Are attached so as to connect the rods 11a, and the direction of the arrow a corresponds to the extension and retraction of the rod 11a.
Or, in the process of moving in the direction of arrow b and moving in the direction of arrow a, the rod 1 is pulled into the arrival shaft 7 via the transmission member 14,
Prior to performing the work of updating the existing pipe 4, the rod 1 is moved in the direction of arrow b to insert the rod 1 from the reaching shaft 7 to the starting shaft 6.

A hole 13a through which the rod 1 and the coupler 2 pass is formed at the center of the carriage 13 (the center of a line connecting the axes of the pair of retracting cylinders 11), and a transmission member is provided downstream of the hole 13a in the retracting direction. A holding member 19 for holding 14 is provided detachably.

The holding member 19 is configured to fit and hold the transmission member 14 and the cotter 20. That is, as shown in FIG. 4, the holding member 19 includes a main body 19a fitted to the hole 13a of the carriage 13 and detachably attached thereto, and a holding portion 19.
b, the holding portion 19b has two fitting portions 19c and 19d, and the fitting portion 19c is fitted with a transmission member 14 which engages with the coupler 2 and transmits a force to the rod 1. , And mating part
A cotter 19d prevents the transmission member 14 from detaching from the holding portion 19b when the rod 1 is inserted into the existing pipe 4.
20 fits.

The transmitting member 14 has an outer shape in which the holding member 19 is fitted.
It is formed in a rectangular shape that can be fitted to 19c, and has a horseshoe-shaped engaging portion 14a formed therein. This engaging portion 14a
Is a ring-shaped groove 2a formed on the outer periphery of the coupler 2.
(See FIG. 8), and the carriage 13 is engaged with the engagement portion 14a in the groove 2a of the coupler 2.
Is driven in the direction of arrow a, the transmission member 14 comes into contact with the main body 19a of the holding member 19, and the force of the carriage 13 in the direction of arrow a is transmitted to the rod 1 via the main body 19a, the transmission member 14, and the coupler 2. . In this process, the rod 1 can be drawn into the arrival shaft 7.

The cotter 20 has a fitting portion 19
A projection 20a that fits into the groove 19e formed in d is formed, and a fitting portion 20b having a size smaller than the engaging portion 14a of the transmission member 14 is formed inside. When the carriage 13 is driven in the direction of arrow b with the cotter 20 fitted in the fitting portion 19d of the holding member 19 and the transmitting member 14 fitted in the groove 2a of the coupler 2, the transmitting member 14 The force of the carriage 13 in the direction of arrow b is transmitted to the rod 1 via the holding portion 19b, the cotter 20, the transmission member 14, and the coupler 2 in contact with the rod 20. In this process, the rod 1 can be inserted into the existing pipe 4 from the reaching shaft 7 to the starting shaft 6.

In particular, since the transmission member 14 and the cotter 20 have the horseshoe-shaped engaging portions 14a and 20b formed inside, the rod 1 is held when the rod 1 is retracted or the rod 1 is inserted into the existing pipe 4. When attached to the fitting portions 19c and 19d of the member 19, it is possible to straddle the rod 1 or the coupler 2 with this attachment, and the work can easily proceed.

The coupler 2 connects the rods 1 to each other. As shown in FIG. 8, tapered portions 2b are formed at both ends in the longitudinal direction, and a substantially central portion is formed in a cylindrical shape. The engaging portion 14 of the transmission member 14 is provided on the outer periphery of the cylindrical portion.
A ring-shaped groove 2a for receiving the projection a is formed. Further, a screw portion 2c that is screwed with the screw of the rod 1 is formed inside.

In the coupler 2 formed as described above, the rods 1 can be connected to each other in the longitudinal direction to form a long rod. It is possible to transmit a force corresponding to the moving direction to the rod 1.

The locking member 15 holds the rod 1 on which tension is applied by engaging the coupler 2 and holding the coupler 2. The locking member 15 is a frame
A shaft 15b attached to a cylindrical seat 15a attached to the through hole 17c and a claw 15 rotatably attached to the shaft 15b
c and a spring 15d, such as a torsion coil spring, for urging the claw 15c to rotate in a direction in which the tips approach each other. Particularly, four pawls 15c are arranged around the rod 1, and the coupler 2 is configured to be able to hold the coupler 2 by sandwiching the periphery of the rod 1 with the four pawls 15c.

In the locking member 15 configured as described above, while the carriage 13 is moving in the direction of the arrow a, the pawl 15c contacts the outer periphery of the rod 1 by the urging force of the spring 15d.
When the coupler 2 comes into contact with c, the claw 15c rotates against the urging force of the spring 15d. Then, when the coupler 2 is detached from the claw 15c, the claw 15c contacts the outer periphery of the rod 1 again and holds the position. Therefore, when the retraction of the rod 1 is completed, the pawl 15c engages with the coupler 2 to hold the rod 1.

The gripping member 18 is an existing pipe 4 facing the reaching shaft 7.
To prevent a displacement between the drawing device and the existing pipe 4. For this reason, the gripping member 18 is provided on the frame 17 and is configured using a through hole 17c formed in the frame 17 (see FIGS. 1 and 4).

The gripping member 18 has a split sleeve 18a formed by dividing a cylinder having an inner diameter substantially equal to or larger than the outer diameter of the existing pipe 4 into a plurality of parts (in this embodiment, two parts), and a split sleeve 18a. Flange member that regulates axial movement of
18b, and a bolt 18c which is screwed into the split sleeve 18a and tightens the existing pipe 4.

In the gripping member 18 configured as described above, the split sleeve 18a is attached to the end of the existing pipe 4 before the rod 1 is retracted, and the frame is held by the flange member 18b.
Attached to 17 so that it cannot move in the axial direction,
The carriage that constitutes the retracting device by tightening
The axial center of the holding member 19 provided on 13 can be made coincident with the axial center of the existing pipe 4, and the retraction device and the existing pipe 3 can be fixed to prevent displacement.

In the retracting device constructed as described above, the retracting cylinder 11 and the reaction force receiving cylinder 12 are each constituted by a hydraulic cylinder.
As shown in FIG. 10, an operation panel 21 incorporating an operation valve 21a for hydraulic pressure is disposed, and a hydraulic unit 22 on the ground or on a truck is disposed near the reaching shaft 7.

The operation panel 21 is provided with hydraulic operation valves 21a corresponding to the cylinders 11 and 12, respectively. The cylinders 11 and 12 selected according to manual operation of the lever 21b by an operator are provided.
It is configured so that pressure oil can be supplied to 12.

The hydraulic unit 22 may be a unit with an engine or a unit with a battery. Furthermore, a unit configured to drive the hydraulic pump by outputting from the engine of the truck may be used.

Next, a procedure for pulling the rod 1 by the retracting device configured as described above will be briefly described.

First, a plurality of rods 1 are connected to an existing pipe 4
The rod 1 is inserted from the reaching shaft 7 toward the starting shaft 6, and the rod 1 is connected to the updating device 3 at the starting end and the PE pipe 5 is connected to the updating device 3. As shown in FIG. 5, this operation is performed while the claws 15c of the locking member 15 are previously opened (separated from each other) and the plunger 15e maintains the open state.

A drawing device is installed in the arrival shaft 7. At this time, the gripping member 18 is attached to the end of the existing pipe 4 facing the reaching shaft 7, and the gripping member 18 is attached to the frame 17. Then, the first rod 1 with the coupler 2 attached to the end is connected to the existing pipe 4 through the holding member 19 provided on the carriage 13.
After inserting one rod 1, a new rod 1 is connected to the coupler 2 of the rod 1. The holding portion 19b of the carriage 13 is moved to a position corresponding to the coupler 2 by extending the rod 11a of the retracting cylinder 11.
Next, the transmitting member 14 is fitted to the fitting portion 19c of the holding portion 19b, and the transmitting member 14 is fitted to the coupler 2;
The cotter 20 is fitted to the fitting portion 19d.

When the carriage 11 is moved in the direction of the arrow b by pulling the rod 11a in the above state, the cotter 20 comes into contact with the transmission member 14 with this movement, and the rod 1 is moved through the transmission member 14 and the coupler 2. It is moved in the direction of arrow b and inserted into the existing pipe 4. By repeating this operation, the rod 1 can be inserted toward the starting shaft 6.

When the rod 1 reaches the starting shaft 6, the updating device 3 is attached to the end of the rod 1, and a pipe 5 to be newly laid on the updating device 3 is attached. Further, the pawl 15c by operating the plunger 15e constituting the locking member 15 of the retraction device can be freely rotated about the shaft 15b. Thus, the setup for performing the work of updating the existing pipe 4 with the new pipe 5 is completed.

Next, the rod 11a of the retracting cylinder 11 is extended to move the carriage 13 in the direction of the arrow a, and the renewing device 3 is retracted toward the reaching shaft 7 until the updating device 3 comes into contact with the inner peripheral surface of the existing pipe 4. Remove the rod 1. This allows
The setup for pulling the rod 1 is completed. In this state, no tension acts on the rod 1.

Next, as shown in FIG. 6 (a), the rod 11a of the retracting cylinder 11 is retracted, the carriage 13 is moved in the direction of the arrow b, and the holding portion 19b is moved to a position facing the coupler 2. In this state, the transmission member 14 is fitted to the fitting portion 19c of the holding portion 19b, and the transmission member 14 is fitted to the coupler 2. At this time, there is no need to fit the cotter 20 into the fitting portion 19d.

Next, as shown in FIG. 7B, the rod 11a of the retracting cylinder 11 is extended to move the carriage 13 in the direction of arrow a, and the same direction is applied to the rod 1 via the transmission member 14 and the coupler 2. To give the power of. Thereby, tension acts on the rod 1 and elongation occurs. Further, the updating device 3 moves inside the existing pipe 4 to break the existing pipe 4 and expand its diameter, thereby updating the existing pipe 4 to the pipe 5. Arrow a on carriage 13
When the movement in the direction reaches a length corresponding to one rod 1, the coupler 2 passes through the claw 15c of the locking member 15, and
15c faces the upstream side of the coupler 2 in the retraction direction. In this state, the extension of the rod 11a of the retracting cylinder 11 is stopped.

Further, as shown in FIG.
Is retracted, the rod 1 contracts in the direction of arrow b due to the tension acting on the rod 1 with the retraction, and the coupler 2 engages with the locking member 15 and is locked. In this state, the same tension acts on all the rods 1 from the rod 1 held by the locking member 15 to the updating device 3, and the same elongation occurs. As described above, the rod 1 is held while the tension currently acting on the rod 1 is maintained, and the carriage 13 is moved in the direction of arrow b to return to the frame 17 side. At this time, the transmission member 14 is disengaged from the fitting portion 19c (see FIG. 4) while being engaged with the coupler 2, and is recovered by the operator. At the same time, the operator removes the rod 1 downstream of the coupler 2 held in the locking member 15 in the retraction direction.

Next, as shown in FIG. 7A, the transmission member 14 is fitted to the holding portion 19b (see FIG. 4) of the holding member 19 provided on the carriage 13, and the transmission member 14 is connected to the coupler 2. After that, the carriage 13 is moved in the direction of arrow a as shown in FIG. With the movement of the carriage 13, the rod 1 and the updating device 3 start moving in the same direction.
At this time, there is no large change in the tension acting on the rod 1. Accordingly, there is no large change in the force acting on the updating device 3, and no impact force is generated. Subsequently, by moving the carriage 13 in the direction of the arrow a to a distance corresponding to the length of the rod 1, the coupler 2 passes through the locking member 15, and the coupler 2 is engaged with the claw 15c.

Then, the carriage 13 is moved in the direction of the arrow b, and with this movement, the transmission member 14 is detached from the holding member 19, and the rod 1 downstream of the locking member 15 in the retracting direction is removed ( FIG. 7C).

By repeating a series of operations as described above,
It is possible to pull the rod 1 toward the reaching shaft 7 while breaking the existing pipe 4 and laying a new pipe 5 by the updating device 3. When the second and subsequent rods 1 are pulled, these rods 1 are stretched, but since the position of the coupler 2 is locked by the locking member 15, the stop position is stable,
In addition, the moving distance and range of the carriage 13 are stabilized. Therefore, it is possible to perform the retraction work regularly.

When the renewing device 3 approaches the reaching shaft 7 and the retraction work is near to the end, the bolt 18c of the gripping member 18 is loosened to release the fixing of the existing pipe 4 by the split sleeve 18a, and further, the reaction force is received. The rod 12a of the cylinder 12 is extended. As a result, the frame 17 constituting the retracting device is separated from the wall surface 7a of the reaching shaft 7, and a large space is formed. When the retraction work for the last rod 1 is completed, the updating device 3 and the pipe 5 arrive at the arrival shaft 7, and the existing pipe 4 laid between the starting shaft 6 and the arrival shaft 7 is replaced with a new pipe 5. It can be updated.

[0068]

As described in detail above, in the retracting device according to the present invention, the transmitting member is interposed between the carriage and the rod to perform the retracting operation corresponding to one stroke, and thereafter, the transmitting member and the rod are moved. By returning the carriage with the holding member held by the holding member, a large change does not occur in the force acting on the working member connected to the end of the rod. For this reason, the elongation generated in the rod becomes substantially constant, and the position serving as the starting point of the retraction becomes constant. Therefore, the operation of pulling the rod can be advanced in a stable state.

Also, by fixing the end of the existing pipe exposed to the reaching shaft by the gripping member, the axis of the existing pipe and the axis of the drawing-in device can be matched, and the displacement of the drawing-in device is prevented. I can do it.

Further, in the coupler of the present invention, by providing the groove on the outer peripheral surface, the engagement with the transmission member and the release of the engagement can be extremely easily performed. For this reason, it is advantageous to use when a work member connected to the end of a plurality of connected rods is pulled in to perform a target work.

[Brief description of the drawings]

FIG. 1 is a plan view of a retracting device according to the present embodiment.

FIG. 2 is a side view of the retracting device.

FIG. 3 is a front view of the retracting device, and is a view taken in the direction of arrows III-III in FIG.

FIG. 4 is a partial cross-sectional view of a main part illustrating a state around a carriage when a rod is pulled.

FIG. 5 is a partial cross-sectional view of a main part illustrating a state around a carriage when pushing a rod.

FIG. 6 is a diagram illustrating a procedure for pulling a rod.

FIG. 7 is a diagram illustrating a procedure for pulling a rod.

FIG. 8 is a diagram illustrating a configuration of a coupler.

FIG. 9 is a side view illustrating a configuration when updating a pipe.

FIG. 10 is a plan view illustrating a configuration when a pipe is updated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rod 2 Coupler 2a Groove 2b Taper part 2c Screw part 3 Renewal device 4 Existing pipe 5 Pipe 6 Starting shaft 7 Reaching shaft 8 Branch member 11 Retraction cylinder 11a, 12a Rod 12 Reaction force receiving cylinder 12b Contact plate 13 Carriage 13a Hole 14 Transmission member 14a Engaging portion 15 Locking member 15a Seat 15b Shaft 15c Claw 15d Spring 16, 17 Frame 16a, 17a Leg 17b Connection member 17c Through hole 18 Gripping member 18a Split sleeve 18b Flange member 18c Bolt 19 Holding member 19a Main body 19b Holding Parts 19c, 19d Fitting part 20 Cotta 20a Projection 20b Fitting part 21 Operation panel 21a Operating valve 21b Lever

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Hirai 19-18 Sakuradacho, Atsuta-ku, Nagoya-shi, Aichi F-term in Higashi Kunigas Co., Ltd. 2D054 AA06 BA18

Claims (5)

[Claims] 1. A work member which is disposed between a start side and an arrival shaft, has a predetermined length and is connected in a straight line, and is connected to a predetermined working member at an end portion and connected via a coupler. A retraction device that pulls a number of rods connected to each other toward a reaching shaft side, comprising: a retraction cylinder disposed along a retraction direction; a reaction force receiving cylinder disposed along the retraction cylinder; and a retraction cylinder. A carriage that is driven to reciprocate linearly, a transmission member that is mounted between the carriage and the rod and that transmits the linear movement of the carriage to the rod, and that is engaged with a coupler provided at a predetermined position and connected to the rod to be locked. Having a locking member that transmits a pulling force from the carriage to the rod via a transmission member when the carriage is moved from the upstream side to the downstream side in the retraction direction. When the rod is pulled and a predetermined retraction stroke is completed, the locking member engages with the coupler to lock the rod, and further, the locking state of the rod by the locking member is maintained to move the carriage upstream in the retraction direction. To the side,
A retracting device, wherein the rod is sequentially pulled by interposing a transmission member between the carriage and the rod after the carriage reaches a movement limit to the upstream side. 2. The method according to claim 1, wherein the rod is disposed inside an existing pipe buried underground, and a gripping member for gripping an end of the existing pipe by a plurality of arc pieces is provided. The retracting device according to claim 1, wherein 3. A coupler for connecting a rod pulled by the retracting device according to claim 1 or 2, wherein a groove for engaging with the transmitting member is provided on an outer peripheral surface. 4. A starting shaft and a reaching shaft are constructed at predetermined positions in a pipeline, and the retraction device according to claim 1 is installed in the reaching shaft, and the starting shaft is set inside the existing pipe from the reaching shaft by the drawing device. After passing the rod toward the starting shaft by passing through the rod, a working member for performing a predetermined work on the existing pipe is connected to the tip of the rod, and then a transmission member is interposed between the carriage and the rod of the retracting device. Then, the carriage is driven in the retracting direction to retract the working member,
After the retraction corresponding to the length of one rod is completed, the rod is engaged with the locking member to temporarily lock, and then the carriage is driven in the direction opposite to the retraction direction to be temporarily locked. A pull-in method in which the carriage is driven in the pull-in direction by interposing a transmission member between the carriage and the rod again after the rod is opposed to the rod and the rod is removed. 5. When installing the retracting device according to claim 1 or 2 in an arrival shaft constructed at a predetermined position in a pipeline,
The rod of the reaction force receiving cylinder arranged along the retraction cylinder is reduced in advance, and at the end of a series of retraction operations, the reaction force receiving cylinder is extended and the retraction cylinder is moved downstream in the retraction direction. The retracting method according to claim 4, wherein a space for retracting the working member is formed upstream of the retracting cylinder in the retracting direction.