JPH0147677B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing a synthetic resin outlet pipe.

When repairing a synthetic resin main pipe buried underground that transports fluids such as city gas without stopping the fluid transport, it is necessary to connect synthetic resin outlet pipes to the main pipe at both ends of the construction site. These extraction pipes are connected to each other by a connecting pipe to form a side passage. After the repair work is completed, it will be necessary to remove this outlet pipe.

Conventionally, after the repair work was completed, the outlet pipe was closed by pinching it from the outside, and in that state, the connecting pipe was removed and a synthetic resin cap was placed at the end of the outlet pipe, which was cut at an appropriate position, for closure. Heat fused,
After the cap is heat-sealed, the pressure on the extraction tube is released. In order for the joint between the take-out pipe and the main pipe not to be damaged when the take-out pipe is squeezed, and to ensure that the end where the cap is heat-sealed is almost a perfect circle, it is necessary to The length of the take-out pipe to the end needs to be approximately 5 times or more the outer diameter of the take-out pipe. In the prior art, therefore, relatively long extraction tubes remained. Therefore, there is a high possibility that the extraction pipe will be caught and damaged by other excavation work or the like.

An object of the present invention is to provide a method that allows almost all of the synthetic resin outlet pipes to be removed.

The present invention provides a method for removing a synthetic resin extraction tube that communicates with an extraction hole drilled in a pipe for transporting fluid and has its base end fixed, which includes closing the extraction tube by pinching the middle of the extraction tube in the longitudinal direction. , in the closed state, cut the extraction pipe on the side opposite to the fluid transport pipe with respect to the clamping position, and
After inserting a plug into the free end and releasing the pinched state of the extraction tube, the plug is moved to the proximal end side to close the extraction hole, and the extraction tube is cut near the proximal end. This is a method for removing a synthetic resin outlet tube, which is characterized by fitting a synthetic resin cap to the free end of the outlet tube that remains after cutting and heat-melting it to seal it airtight.

The operation of the present invention will be described. The proximal end of the extraction tube is fixed to the tube that transports the fluid, and the extraction tube is closed by being compressed in the middle in the longitudinal direction. In this closed state, the extraction tube is cut on the side opposite to the fluid transport tube with respect to the clamping position. A plug is inserted into the free end of the cut extraction pipe. Then, the blocked state of the extraction pipe is released. Therefore, the plug is in a state where it can be inserted and displaced within the extraction pipe, and since the plug is inserted into the extraction pipe, a large amount of fluid will not leak from the fluid transport pipe.

The plug in the extraction tube is moved to the proximal end side, and the extraction hole is closed using the plug. This prevents leakage of fluid within the tube.

Therefore, next, the extraction tube is cut near the proximal end. Therefore, the extraction pipe does not remain long from the fluid transport pipe.

After cutting and removing the extraction tube near the proximal end,
A synthetic resin cap is fitted onto the remaining free end of the extraction pipe and heat-fused to seal it airtight. Therefore, even if fluid were to leak from the outlet hole closed by the plug, the fluid would be reliably prevented from leaking to the outside.

An embodiment of the present invention will be described with reference to FIG. In order to repair the main pipe 1 made of synthetic resin, such as polyethylene, buried underground, a vertical hole 150 is excavated and rollers 151, 15 are
Repair is performed at the cut-off repair location 153 using 2. The main pipe 1 is used to transport fluid such as city gas. This repair point 15
In order to maintain fluid supply during the construction work in step 3, an outlet pipe 3 is connected to one side of the main pipe 1 via a saddle 2, and a short pipe is connected to this outlet pipe 3 via a socket joint 5. A tube 54 is connected. A take-out pipe 56 is also connected to the other side of the main pipe 1 via a saddle 55, and a short pipe 58 is connected via a socket joint 57. The short pipes 54, 58 are the joints 59,
60 and are interconnected by a connecting pipe 61. The saddles 2, 55, the outlet pipes 3, 56, the socket joints 5, 57, and the short pipes 54, 58 are made of synthetic resin. After the repair of the repair portion 153 is completed, the extraction pipes 3, 56 are removed without leaking the fluid in the main pipe 1 to the outside.

To remove the take-out pipe 3, as shown in FIG. 2, a tool having rollers 62 and 63 is used to pinch the middle of the take-out pipe 3 in the length direction, and the take-out pipe 3 is airtightly closed. do. The other extraction pipe 56 is similarly closed. The short tube 54 is then cut at the position indicated by reference numeral 64 in FIG. This cutting point is also shown for reference in FIG. Therefore, another socket joint 65 is heat-sealed to the remaining short pipe 54 connected to the socket joint 5 to connect it airtightly, and a plug attaching machine 66 is airtightly attached to this socket joint 65. .

FIG. 3 shows the plug installation machine 66 connected to the socket joint 6.
5 is a sectional view showing a state in which the outlet hole 11 formed in the main tube 1 is closed by a plug 67 when the plug 67 is attached to the main tube 1. FIG. This plug fitting machine 66 includes a clamp member 4 that holds the free end of the outlet pipe 3 openably and closably on the side of the main pipe 1 from the socket joint 5, a base body 6 that is hermetically fitted into the socket joint 65, and the base body 6. A drive rod 7 that has the same axis as the axis of the extraction pipe 3 and is displaceably and airtightly fitted therein, a plug 67 that is removably fixed to one end of the drive rod 7 near the main pipe 1, and a drive rod. 7
It includes a driving means 9 provided at the other end, and a tightening means 10 that tightens and connects the clamp member 4 and the base body 6 in a direction in which they approach each other.

FIG. 4 is a plan view of the clamp member 4. The clamp member 4 includes a pair of half pieces 12 and 13 that contact the outer periphery of the extraction tube 3 approximately half a circumference at a time. One end portions of the half pieces 12 and 13 are mutually pivotally supported by a pin 14 parallel to the axis of the extraction tube 3. Half piece 12
A locking protrusion 15 is protruded from the other end, and a support protrusion 16 is protruded from the other end of the half piece 13. A lever 18 is pivotally supported on the support projection 16 by a pin 17 parallel to the pin 14.
A connecting ring 19 is provided in the middle of the ring 8. Connecting ring 1
When the lever 18 is rotated to the position shown in FIG. 4 with the lever 18 hooked on the locking protrusion 15,
The support protrusions 16 are tightened in the direction in which the half pieces 12, 13 approach each other, that is, in the direction in which the other ends of the half pieces 12, 13 approach each other.
The extraction tube 3 is fixedly held by the handles. When the lever 18 is rotated around the pin 17 as shown by the imaginary line, the connecting ring 19 is released from the locking protrusion 15.
The two halves 12, 13 can thereby be released around the pin 14.

FIG. 5 is an enlarged sectional view of the vicinity of the base 6, and
The figure is a sectional view taken along the cutting plane line - in FIG. 3, and FIG. 7 is a right side view of FIG. 3. A fitting portion 20 extending downward is provided in a protruding manner at the lower portion of the base body 6 . This fitting part 20 has a large diameter part 21 in order from the top.
and a small diameter portion 22, the diameter of the small diameter portion 22 having a value that allows it to fit into the socket joint 65 in an airtight manner. The large diameter portion 21 is used when fitting into a socket joint having a larger diameter than the socket joint 65. O-rings 23 and 24 are provided on the outer peripheries of the large diameter portion 21 and the small diameter portion 22, respectively.

The base body 6 has a through hole 25 that is concentric with the axis of the extraction tube 3.
is formed. This through hole 25 has an O ring 28
is provided. The drive rod 7 is inserted into the through hole 25 .

A driving means 9 including a handle 32 is attached to the end of the driving rod 7 on the opposite side from the main tube 1 by a bolt 34. By reciprocating the handle 32 around the axis of the drive rod 7, the drive rod 7 is rotated in one direction around the axis.

FIG. 8 is a sectional view of the plug 67 and its vicinity, and FIG. 9 is an exploded perspective view thereof. A plug 67 is detachably fixed to the end of the drive rod 7 closer to the main pipe 1. A main body 39 is attached to the drive rod 7, and a plug 67 is screwed onto the main body 39.

An engaging portion 43 having an inverted T-shaped cross section including the axis is formed at one end of the drive rod 7 . From the end surface of the main body 39 near the drive rod 7 to the middle of the through hole 44,
An inverted T-shaped fitting groove 45 having a cross section perpendicular to the radial direction of the main body 39 is formed. This fitting groove 45 is the through hole 4
4 and extends outward along the radial direction and is open to the side of the main body 39. The engaging portion 43 of the drive rod 7 is fitted into this fitting groove 45 as shown in FIG. A recess 46 is formed on the side of the engaging portion 43, and a sphere 47 is fitted into the recess 46.
This sphere 47 is biased toward the recess 46 by a spring 48, thereby preventing relative rotation between the drive rod 7 and the main body 39. Spring 48 is received by support member 49.

Since the engaging portion 43 of the drive rod 7 is engaged with the fitting groove 45, they do not separate from each other in the axial direction, and it is extremely easy for the engaging portion 43 to fit into the fitting groove 45. Therefore, the plug 67 and the hole saw 40 described below can be easily attached to one end of the drive rod 7. When removing the main body 39 from one end of the drive rod 7, the engaging portion 43 of the drive rod 7 may be taken out from the fitting groove 45 along the radial direction of the main body 39. An external thread 69 formed on the main body 39 is engaged with an internal thread 73 of a nut 72 embedded in the plug 67. The plug 67 is
It is made of rubber, has elasticity, and can be fitted into the extraction hole 11 to keep the extraction hole 11 airtight. The outer thread 69, the inner thread 73 and the plug 67 have the same axis as the drive rod 7.

The tightening means 10 includes a pair of handles 50 projecting radially outward on one diameter of the clamp member 4.
, a pair of handles 51 protruding on both sides in the radial direction on one diameter line of the base body 6, and both handles 50, 51.
It includes a connecting member 52 that connects the two, and a screw member 53 provided on the connecting member 52. Connecting member 52
is an engagement hole 154 extending along the axis of the extraction pipe 3
The handle 50 is engaged with one end of the engagement hole 154 (lower end in FIG. 7), and the engagement hole 15
4 (upper end in FIG. 7) has a handle 51.
is engaged. The tip of the screw member 53 provided at the end of the connecting member 52 can come into contact with the handle 51. Therefore, by screwing the screw member 53 into contact with the handle 51 and tightening it, The handles 50, 51 are tightened in a direction toward each other. Thereby, the fitting portion 20 of the base body 6 is reliably fitted into the receptacle of the socket joint 65.

When attaching the plug attachment device 66, the clamp member 4 is attached near the free end of the outlet pipe 3, and the base body 6 is inserted into the socket of the socket joint 65. At this time, a plug 67 is attached to the tip of the drive rod 7 in advance. After the plug fitting machine 66 is hermetically fitted into the socket joint 65 in this way, the rollers 62, 6
3 from the take-out tube 3 to release the clamping pressure by the rollers 62 and 63, and correct the axis-perpendicular cross section of the take-out tube 3 using the clamp member 4 so that it becomes almost a perfect circle.
A plug 67 can be inserted into the extraction pipe 3. Next, the clamp member 4 and the base body 6 are tightened in the direction in which they approach each other by the tightening means 10, and the fitting portion 20 of the base body 6 is connected to the socket joint 65.
securely fit into the socket.

Thereafter, by turning the ratchet handle 32 while pushing it downward in FIG. 3, the drive rod 7 is pushed toward the main pipe 1. This causes the plug 67 to fit into the extraction hole 11. In this way, the extraction hole 11 is hermetically closed. In this state, the handle 32 is rotated so that the outer thread 71 and the inner thread 73 are disengaged.

Insert the plug 67 into the removal hole 11 and remove the plug 67.
After removing the drive rod 7 from the socket, the plug fitting machine 66 is removed from the socket joint 65. Next, the extraction tube 3 is cut near the proximal end as indicated by reference numeral 74 in FIG. Thereafter, as shown in FIG. 14, a synthetic resin cap 75 is heat-sealed to the free end of the extraction tube 3 to seal it airtight. In this way, it becomes possible to cut the extraction pipe 3 extremely short, and there is no fear that the extraction pipe 3 will be damaged during subsequent excavation work or the like.

As another embodiment of the present invention, the outlet hole 11 may be closed using a plug attaching machine 80 shown in FIG. In this embodiment, the base 86 of the plug fitting machine 80 is attached to the short pipe 54 as shown in FIG.
are fitted around the outer periphery of the short tube 54. Step-shaped fitting holes 91 and 92 are formed in the base body 86, and O-rings 93 and 94 are provided in these fitting holes 91 and 92. The free end of the short tube 54 is surrounded and fitted into a small-diameter fitting hole 92. Another large diameter fitting hole 91 that is airtightly fitted is used when the short pipe 54 is of another standard. An O-ring 96 is provided in the base body 86 in an insertion hole 95 through which the drive rod 87 is inserted. The free end of the drive rod 87 is provided with an external thread 97, as shown in FIG. This external thread 97 is removably engaged with an internal thread 73 of a nut 72 embedded in the plug 67. The rest of the structure is the same as that of the previous embodiment, and the plug 67 closes the outlet hole 11, and the cap 75 is thermally welded to close the outlet pipe 3.

The present invention can be implemented not only in the repair work of the main pipe 1 buried underground, but also in a wide range of other technical fields where an extraction pipe is provided. For example, the present invention can be practiced even when a take-out pipe is provided on the side wall of a tank body for storing fluid instead of the main pipe.

To describe the effects of the present invention, the longitudinal part of the synthetic resin take-out pipe communicating with the take-out hole drilled in the pipe for transporting fluid is closed by pinching, and in the closed state, the pinching cutting the extraction tube at a position opposite to the fluid transport tube, i.e., at the proximal end of the extraction tube, and inserting a plug into its free end;
Thereafter, after releasing the pinched state, the plug is used to close the outlet hole, thus preventing leakage of fluid from the fluid transport tube. Thereafter, the extraction tube is cut near the proximal end and removed. Therefore, the extraction tube does not remain from the side wall for a long time. The airtightness can be further improved by sealing the remaining outlet tube in the vicinity of its proximal end by thermally melting the synthetic resin cap.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the vicinity of the repair point 153 of the main pipe 1 in which the present invention is implemented, FIG. 2 is a cross-sectional view showing one process of an embodiment of the present invention, and FIG.
6 is a cross-sectional view of the clamp member 4, and FIG. 4 is a plan view of the clamp member 4.
FIG. 5 is an enlarged sectional view of the vicinity of the base 6 of the plug installation machine 66, FIG. 6 is a sectional view taken from the cutting plane line - of FIG. 3, FIG. 7 is a side view of the vicinity of the base 6, and FIG. 9 is an exploded perspective view of the vicinity of the plug 67, FIG. 10 is a sectional view showing the hole saw 40 attached to the main body 39, and FIG. 11 is an example of another embodiment of the present invention. Cross-sectional view showing the process, 12th
The figure is an enlarged sectional view of the vicinity of the base body 86 of the plug installation machine 80, FIG. 13 is a perspective view of the vicinity of the free end of the drive rod 87 provided in the plug installation machine 80, and FIG. It is a sectional view showing a state in which the vicinity has been cut and removed. 1...Motor pipe, 2,55...Saddle, 3,56...
...Takeout pipe, 4...Clamp member, 5, 57, 65
...Socket joint, 6,86 ...Base, 7,87
...Drive rod, 9...Driving means, 11...Ejection hole,
59, 60...Fitting, 61...Connection pipe, 67
...Plug, 75...Cap.

Claims (1)

[Claims] 1. A method for removing a synthetic resin take-out pipe whose base end is fixed and communicates with an take-out hole drilled in a pipe for transporting fluid, comprising: compressing the middle of the take-out pipe in the longitudinal direction; and in the closed state, cut the extraction pipe on the opposite side of the fluid transport pipe with respect to the clamping position, and
After inserting a plug into the free end and releasing the pinched state of the extraction tube, the plug is moved to the proximal end side to close the extraction hole, and the extraction tube is cut near the proximal end. A method for removing a synthetic resin extraction pipe, which comprises fitting a synthetic resin cap to the free end of the extraction pipe remaining after cutting and heat-melting it to airtightly close it.