JP4565369B2 - How to take out the branch pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch pipe removing method for taking out a resin branch pipe from a side portion of a resin main pipe.
[0002]
[Prior art]
Conventionally, when the supply pipe is branched from underground pipes such as gas and waterworks, the ground around the planned excavation position is largely excavated from the ground to remove earth and sand, and the work is carried out with the underground pipes widely exposed. It was normal. However, this method is unavoidable when the position of the underground pipe cannot be grasped and the position to be excavated cannot be determined accurately, but when the position of the underground pipe is known accurately, the area around the underground pipe is exposed widely. Therefore, the amount of work increased, the amount of excavated earth and sand increased, the excavating machine was required, the construction period was long, it was uneconomical, and there were adverse effects such as traffic in the surrounding area.
In order to solve this problem, there is known a non-opening branching method in which only a necessary portion is drilled and excavated without being greatly excavated as disclosed in JP-A-61-2228184 and JP-A-2-199389. A method of forming a relatively small working space by non-open cutting as disclosed in JP-A-7-239056 is also known.
[0003]
[Problems to be solved by the invention]
However, the non-opening branching method disclosed in Japanese Patent Laid-Open No. 61-228184 and Japanese Patent Laid-Open No. 2-199389 is applied to a pipe in which no internal pressure is applied, such as a pipe in which no internal pressure is applied, or a sewer pipe. It is not suitable for gas pipe branching. Also, in recent years, synthetic resin pipes such as polyethylene pipes used as gas and waterworks buried pipes cannot be applied because the junctions must be cleaned because the junctions of the branch parts are bonded or heat fusion bonded. was there.
[0004]
The present invention provides a branch extraction method that can perform branch extraction with the minimum size to be excavated from the ground, and can branch out the supply pipe from underground pipes such as waterworks and gas with a short construction period and economically. is there.
[0005]
[Means for Solving the Problems]
The gist of the present invention is that a resin branch pipe is inserted into the buried resin main pipe from the ground, and the resin branch pipe connected to the end with a resin joint is pressed against the side of the resin main pipe while rotating. A branch pipe taking out method of inserting and fusing with frictional heat, inserting a punch into the fused branch pipe, drilling a branch hole in the main pipe, and branching out the branch pipe from the main pipe , The end portion of the resin joint of the resin branch pipe has a closed fusion surface. When the resin joint is pressed against the side surface of the resin main pipe and rotated by frictional heat, the resin joint pipe is made of resin. A branch pipe taking-out method is characterized in that the fusion-sealed surface of the joint has a protruding portion protruding in the axial direction .
In the above, melting Chakumen of the resin joint is a branched pipe extraction method characterized by having a projecting portion of the outer diameter larger than the outer diameter of the branch pipe.
The gist of the present invention is that a resin branch pipe is inserted into the buried resin main pipe from the ground, and the resin branch pipe connected to the end with a resin joint is pressed against the side of the resin main pipe while rotating. A branch pipe taking out method, in which a fusion tool is inserted in the fused branch pipe, a punching tool is inserted into the main pipe, a branch hole is drilled in the main pipe, and the branch pipe is taken out from the main pipe. The end of the resin joint of the resin branch pipe has a closed fusion surface. When the resin joint is pressed against the side surface of the resin main pipe and rotated by frictional heat, it is made of resin. The branch pipe taking-out method is characterized in that the fusion surface of the joint has a projecting portion having an outer diameter larger than the outer diameter of the branch tube, and the projecting portion is provided on the projecting portion.
In the above, the branch pipe removing method is characterized in that a flat portion is provided on a side surface of the main pipe, and a resin branch pipe or a resin joint is fused to the flat portion.
Further, in the above, a drilling hole is provided from the ground to the buried resin main pipe, and a high-pressure fluid is jetted by inserting a fluid injection nozzle and a discharge pipe into the drilling hole, and cleaning around the resin main pipe and muddy water A branch pipe removal method, wherein a branch work space is formed by inserting the resin branch pipe into the branch work space and then fused to the side of the main pipe to take out the branch pipe. It is.
Moreover, after providing a digging hole, a protection pipe | tube can be inserted from the ground and the said injection nozzle and a discharge pipe can be inserted in a protection pipe | tube.
In addition, a casing that can be moved forward is attached to the tip of the protective tube, and a branch extraction space for the main tube can be formed in the casing. Further, a seal member that is in close contact with the main pipe is provided at the tip of the casing, and the branch work space can be formed by bringing the seal member into close contact with the main pipe by the forward movement of the casing.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an overall view including a supply pipe propulsion device before propulsion work. FIG. 2 shows a process of forming an excavation mine until the position just before the main pipe buried underground from the ground is reached. 3 and 4 show a step of forming a branch work space and a step of cleaning the vicinity of the main pipe. FIG. 54 shows a step of inserting a small branch joint for rotary fusion. FIG. 65 shows a process of fusing to the main pipe by rotational friction welding.
[0007]
In FIG. 1, a synthetic resin main pipe 2 made of polyethylene or the like is embedded in the ground 1 on the road side. A propulsion device 3 is installed in the residential land. First, a hole is provided perpendicularly to the main pipe 2 from the ground, and a transmitter 6 is attached to the main pipe 2. While checking the target position from the propulsion device 3 based on the radio wave from the transmitter 6 as shown in FIG. The propulsion head 4 is advanced, and the excavation pit 5 is formed by excavating with the propulsion direction and angle corrected. Here, as the propulsion head 4, an auger or the like capable of propelling by rotary excavation is used. Moreover, you may use what can hit a ground surface with an air hammer etc. and can advance a mine. Alternatively, a small-diameter guide rod may be drilled and propelled immediately before the main branch pipe, and then the drilling resistor 5 may be formed using the diameter expanding device 18. At that time, the protective tube 7 may be pulled in simultaneously.
[0008]
Subsequently, as shown in FIG. 3, the protective pipe 7 is inserted into the excavation pit 5 from the ground, and when the tip of the protective pipe 7 reaches the vicinity of the main branch pipe 2, the high-pressure water injection nozzle 8 is inserted into the protective pipe 7 from the ground. Then, high-pressure water is guided from a high-pressure fluid generator installed on the ground with a high-pressure hose or the like, and sprayed from the nozzle 8 toward the ground surface of the buried main pipe 2 to dig up the ground surface and muddy the earth and sand. On the other hand, the generated muddy water is sucked up and discharged to the ground through the discharge pipe 9 inserted into the protective pipe 7 as shown in FIG. 4, and the ground surface is dug down.
[0009]
Next, the protective tube 7 is further inserted into the ground 1, and excavation of the ground 1 is performed while repeating the high-pressure water injection and suction operation as described above, and the protective tube 7 is pushed to a position close to the main tube 2. When digging in this way, the surface of the main pipe 2 is exposed on the bottom surface of the excavation mine 5, and further, the high-pressure water is injected to make the soil around the main pipe 2 muddy and discharged, and a space 10 having a certain size. Is formed.
[0010]
In this way, when the depth of the excavation pit 5 still does not reach the predetermined depth even when the entire protective tube 7 is inserted into the ground 1, the protective tube 7 is attached by connecting a separately prepared unit tube to the rear end. You may extend and continue drilling. Further, since the excavated pit 5 is not straight, the propulsion head 4 may correct the direction according to the signal from the transmitter 6 and the digged pit 5 may eventually bend. A flexible pipe, for example, a corrugated pipe formed with irregularities along the longitudinal direction of the pipe axis, or a synthetic resin pipe such as polyethylene is made flexible so that it can follow even if the excavation pit 5 is bent. .
In addition, an illuminating mechanism is provided along with the fluid ejecting head 8 in order to observe on the ground the state of soil discharge around the buried main branch pipe 2 and the soil adhering to the outer surface of the main branch pipe 2 by ejecting fluid from the fluid jet nozzle 8. The TV camera device 11 may be inserted into the protective tube 7. Observation can be performed by irradiating the periphery of the main branch pipe 2 with an illumination mechanism.
[0011]
Further, as shown in FIG. 4, a casing 12 capable of moving back and forth is finally extended from the inner tip of the protective tube 7, and by this forward movement, a branch working space 13 is formed which is in close contact with the main branch 2 and is cut off from the ground 1. . Sealing members 14 and 14 are provided at the front end of the casing 12 so as to be in close contact with the main branch pipe 2. Since the sealing materials 14, 14 are made of a flexible material such as rubber, a branch work space 13 that is in close contact with the main branch pipe 2 is formed, and is sealed from the external ground.
[0012]
Further, in the sealed branch work space 13, the high pressure water is further jetted from the fluid jet nozzle 8 toward the surface of the main pipe 2 to wash the branch portion of the main pipe 2, and the generated wash water is muddy water. Similarly, the work space 13 is formed by sucking and discharging to the ground via the discharge pipe 9. Thereafter, the TV camera device 11 confirms whether the main pipe 2 is cleaned or has a surface condition from the ground.
[0013]
Next, as shown in FIG. 5, the tube axis center position of the main pipe 2 is detected, and the branch joint 15 to be fused to the main pipe is inserted into the protective pipe 7. A supply pipe 16 is connected to the branch joint 15 in advance. The branch joint 15 is introduced into the work space 13 through the protective tube 7 while correcting the posture, and attached to the branch portion of the main tube 2.
Next, as shown in FIG. 6, while holding and rotating the branch joint 15, it is rotated to the main pipe 2 with a predetermined pressing force, the pressing portion is melted and softened by frictional heat, and the position is held so as not to change for a predetermined time. Wait for cooling for a predetermined time. After a predetermined time has elapsed, the joint holder 17 is pulled up from the protective tube 7. At that time, as in the case of observing the surface of the main branch pipe described above, a TV camera device is installed on the joint holder 17 to check the fused state.
[0014]
Here, the supply pipe 16 may be directly held and pressed on the side of the main pipe 2 and rotated and fused by frictional heat. 7 may be fused to the side surface of the main pipe 2. The branch joint 20 has a closed surface 21. When the joint 20 is pressed against the main pipe 2, the closed surface 21 linearly contacts the arc side surface of the main pipe 2 to rotate, and the arc side surface of the main pipe 2 is rotated. The frictional heat is generated in a linear shape and the side surface linear melt width spreads and melts to the outer diameter width of the joint 20 while melting sequentially, and the joint 20 is finally fused to the arc side surface. Therefore, the kinetic force of rotating the joint 20 while pressing it can be smoothly performed. Further, the molten resin at the time of fusion is pushed out to the outer peripheral side of the joint 20 to generate the bead 22, but the bead 22 is not generated in the joint 20. For this reason, after fusing, the drilling operation when drilling in the main pipe 2 can be easily performed.
[0015]
Further, as shown in FIG. 8, the closing surface 21 may be formed in an umbrella shape by providing a protruding portion 23 protruding in the axial direction on the fusion closing surface of the branch joint 20. In this case, the protruding portion 23 is pressed at one point on the arc side surface of the main pipe 2 so as to be positioned at the time of the pressing rotation, and the joint 20 can be smoothly pressed and rotated against the main pipe 2.
Moreover, as shown in FIG. 9, while providing the protrusion part 232 which protrudes in an axial direction on the fusion | melting obstruction | occlusion surface of the branch joint 20, you may provide the circular-arc-shaped overhang | projection part 24 which protrudes to an edge part outer peripheral side. In this case, in addition to the positioning by the projecting portion 23, the bead 22 is pushed out to the outer peripheral side of the joint at the time of fusing with the main pipe 2, and the fusing portion 24 is also fused to increase the fusion area. 2 and the branch joint 20 are firmly fused. Furthermore, as shown in FIG. 10, by providing the convex shape portion 26 so that the bead does not come out at the overhanging portion, it becomes difficult for the bead to go out, and the frictional heat is used for fusion more efficiently. it can.
As shown in FIG. 11, before the branch joint 20 or the supply pipe 16 is fused, a flat portion 25 is formed on the fusion side surface of the main pipe 2, and then the branch joint 20 or the supply pipe 16 is rotated. It may be fused.
[0016]
Next, air is introduced from the supply pipe 16 on the ground, and a hermetic test of the fusion part is performed. Thereafter, a punching device is inserted from the supply pipe to punch the surface of the main branch pipe. In addition, the airtight test and the drilling work are performed using an apparatus widely used in the conventional branching work. Next, the fluidized soil is filled into the protective tube 7 and the space between the supply tube 16 and the protective tube 7 is backfilled, and finally the protective tube 7 is removed to the ground. Note that the protective tube 7 may be left in the ground.
This is the end of the method for taking out the supply pipe from the underground buried branch.
[0017]
【The invention's effect】
As described above, according to the method of taking out the supply pipe from the underground buried main branch of the present invention, it is possible to perform the branching work with the minimum necessary excavation to the underground buried main branch without dug up the ground widely. This joint pipe can be reliably joined and drilled from the ground. As a result, the construction period can be shortened and work costs can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall view including a supply pipe propulsion device before propulsion work according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a process for forming an excavation mine from the private side to the main branch pipe 2 buried under the road.
FIG. 3 is an explanatory diagram of a process for inserting a protective tube 7 and injecting high-pressure water from a nozzle 8;
FIG. 4 is an explanatory diagram of a process of injecting high-pressure water in a casing 12 and sucking up muddy water from a discharge pipe 9;
FIG. 5 is a process explanatory diagram for inserting the branch joint 15 into the protective tube 7 while holding the branch joint 15 with the gripping tool 17;
FIG. 6 is a process explanatory diagram of a rotary fusing work that rotates while pressing the branch joint 15 against the main pipe 2;
FIG. 7 is a process explanatory diagram showing a rotational fusion work when the branch joint 20 with the blocking surface 21 is used.
FIG. 8 is a cross-sectional view of an embodiment in which a protruding portion 23 is provided on a branch joint 20;
9 is a cross-sectional view of an embodiment in which a projecting portion 23 and an overhang portion 24 are provided on the branch joint 20. FIG.
FIG. 10 is a cross-sectional view of an embodiment in which a projecting portion 23 and an overhang portion 24 are provided on the branch joint 20 and a protruding portion 26 is provided on the overhang portion.
FIG. 11 is a cross-sectional view of an embodiment in which a flat joint 25 is formed on the fusion surface of the main pipe 2 and the branch joint 20 is fused before the rotary fusion process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Main branch pipe 3 Supply pipe | tube propulsion apparatus 4 Propulsion head 5 Excavation hole 6 Transmitter 7 Protective pipe 8 Fluid injection nozzle 9 Exhaust pipe 10 Space 11 TV camera apparatus 12 Casing 13 Branch work space 14 Seal member 15, 20 Branch joint 16 Supply pipe 17 Joint gripper 21 Blocking surface 22 Bead 23 Protruding part 24 Overhang part 25 Flat part 26 Convex part

Claims (5)

A resin branch pipe is inserted from the ground into the buried resin main pipe, and the resin branch pipe with the resin joint connected to the end is pressed against the side of the resin main pipe to rotate and melt by frictional heat. A branch pipe take-out method for inserting and punching a branching tool into the fused branch pipe, drilling a branch hole in the main pipe, and branching out the branch pipe from the main pipe ,
The end of the resin joint of the resin branch pipe has a closed fusion surface,
When the resin joint is pressed against the side surface of the resin main pipe while rotating and is fused by frictional heat, the closed joint surface of the resin joint has a protruding portion protruding in the axial direction. How to take out the branch pipe. When the resin joint is pressed against the side surface of the resin main pipe and is rotated and fused by frictional heat, the fusion surface of the resin joint has a protruding portion with an outer diameter larger than the outer diameter of the branch pipe. The method for removing a branch pipe according to claim 1 . A resin branch pipe is inserted from the ground into the buried resin main pipe, and the resin branch pipe with the resin joint connected to the end is pressed against the side of the resin main pipe to rotate and melt by frictional heat. A branch pipe take-out method for inserting and punching a branching tool into the fused branch pipe, drilling a branch hole in the main pipe, and branching out the branch pipe from the main pipe,
The end of the resin joint of the resin branch pipe has a closed fusion surface,
When the resin joint is pressed against the side surface of the resin main pipe and rotated and fused by frictional heat, the fused surface of the resin joint has a protruding portion having an outer diameter larger than the outer diameter of the branch pipe. A branch pipe take-out method, wherein the projecting portion is provided with a convex portion. The main side flat portion is provided in the branch pipe extraction method according to any one of claims 1 to 3, characterized in that fusing the resin branch tube or resin joint flat portion. An excavation hole is provided on the buried resin main pipe from the ground, and a high-pressure fluid is injected by inserting a fluid injection nozzle and a discharge pipe into the excavation hole, and cleaning around the resin main pipe and muddy water are discharged. 5. A branch work space is formed, and then the resin branch pipe is inserted into the branch work space and fused to the side of the main pipe to take out the branch . branch pipes taken out methods described.

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