JP5134279B2 - Embedded pipe branching part fusion apparatus and buried pipe branching part fusion method - Google Patents

Description

  The present invention relates to a buried pipe branching part fusion device and a buried pipe branching part fusion method for joining resin pipes by fusion in an existing buried pipe. The present invention relates to a branch fusion apparatus used when repairing by inserting a lining or a resin pipe from the inside of a pipe without excavating a relatively small-diameter gas pipe extended in an embedded state up to each house. In the method of renewing a pipe by inserting a new resin pipe into an existing steel pipe, the new resin pipe inserted into the main pipe and the new resin pipe inserted into the branch pipe are embedded from the inside of the pipe. The present invention relates to a branch portion fusion apparatus for joining by fusion and an operation method thereof.

  Patent Document 1 discloses a method of sealing the main pipe and the branch pipe from the inside after the branch pipe is drilled after the repair of the buried pipe by the lining of the main pipe. In Patent Document 1, a hook-like member with a male screw is pulled by a cord-like body from a hole drilled in a branch portion of a branch portion resin lining, and a female screw pipe installed on the branch pipe side and a member on the flange are connected. A method is described in which a main pipe and a branch pipe are connected in a state where airtightness is maintained by fitting a male screw portion.

  Furthermore, the method disclosed in Patent Document 2 is known as a method for joining plastic pipe lines by electromagnetic induction. In Patent Document 2, a resin joint is prepared in a state where an induction coil is embedded in a resin portion to be fused in advance, and a heater is installed between the joint in which the coil is embedded and a material to be fused. How to do is described.

JP-A-7-248092 Japanese Patent Laid-Open No. 10-227385

  In the invention described in Patent Document 1, since it is necessary to install a piping member having a female screw on the branch pipe side, it is necessary to excavate the branch portion. For this reason, there existed a subject that a junction of an embedding state cannot be joined.

  On the other hand, regarding the invention described in Patent Document 2, it is difficult to embed a heater in advance on the resin piping side, and in order to embed the heater in the flange side, it is possible to fuse the heater due to dimensional restrictions on the flange portion. There was a possibility that it could not be heated to the temperature. Furthermore, there has been a problem that it is necessary to disconnect the electric wire for supplying current to the coil embedded in the flange portion at the end of the fusion.

  The object of the present invention has been made in view of the above-mentioned problems, and is a method of repairing a pipe by inserting a new resin pipe into the main pipe and branch pipe of an aged steel pipe having a small bore diameter of about 20 mm to 200 mm. In the present invention, a buried pipe branching portion fusion apparatus for fusion-bonding a main pipe and a branch pipe of a new resin pipe from the inside of the pipe in a buried state and a buried pipe branching portion fusion method using the apparatus are realized. .

  In order to solve the above-mentioned problems, a branch part fusion apparatus according to the present invention comprises a high-frequency coil for generating an induction current in a heater of a flange part of a joint installed at the end of a new branch pipe, and the new high-frequency coil. A fusion head having pressing means for pressing against the inner wall surface of the tube, a high-frequency unit having a power source for supplying a high-frequency current to the high-frequency coil, a power source for operating the pressing means, and the high-frequency coil; The power supply, and remote cables for connecting the pressing means and the power source are provided.

  By changing the pressure of the air supplied to the pressing means, for example, the airbag, the pressing force can be easily changed, and highly reliable fusion can be performed.

  In addition, the longitudinal cross-sectional shape of the high-frequency coil is a substantially arc shape with the central portion protruding upward. More specifically, the cross-sectional shape of the portion that contacts the inner wall surface of the high-frequency coil is an arc shape, By making the radius approximately the same as the radius of the inner diameter of the new main pipe, the flange installed at the end of the new resin pipe inserted into the branch pipe is sandwiched between the inner wall surface of the resin main pipe and the high-frequency coil. It can be deformed and held along the wall surface, enabling stable fusion.

  In addition, a high-frequency coil is manufactured by bending a hollow pipe, and a fluid such as water is supplied to the inside of the hollow high-frequency coil for cooling, thereby preventing damage to the high-frequency coil due to heat generation during energization. It becomes possible.

  Also, a cord-like body is installed at the center of the high-frequency coil so that the cord-like body penetrates a top having a diameter larger than the inner diameter of the new branch pipe and smaller than the inner diameter of the joint installed at the end of the new branch pipe. This facilitates positioning when the high frequency coil is installed at the branch portion. That is, a tow rope is passed in advance through the main pipe end insertion side and the branch pipe end, and a cord-like body installed at the center of the high-frequency coil is connected to this rope, and this cord-like shape is connected from the branch pipe end. While pulling the body, the high frequency coil is pulled into the main pipe by pushing the remote cable. At this time, a top having a diameter smaller than the joint inner diameter is drawn into the joint connected to the end of the resin pipe inserted into the branch pipe. Since the top holds the cord-like body at the center of the joint, when the high-frequency coil goes too far from directly below the joint by insertion by pushing operation, the rope drawn from the branch pipe end through the cord-like body is pulled. In this way, it is possible to detect a positional deviation. When the remote cable is pushed and pulled while tension is applied to the cord, it is detected that the high-frequency coil is directly under the joint, and the high-frequency coil is pressed against the inner wall of the main pipe together with the joint flange with an airbag. It can be aligned by fixing.

  Furthermore, the flexible sheet | seat penetrated by the cable-like body was installed so that it might be arrange | positioned between the said high frequency coil and the flange part of the main pipe side edge part in the fusion | melting state in piping. Thus, since the air bag is used as a cushion when the new branch pipe flange is pressed against the inner wall surface of the resin main pipe with the high-frequency coil, the pressing can be made uniform. Furthermore, by making the area of the high-frequency coil larger than the area of the flange, even if the center of the flange and the center of the high-frequency coil are misaligned, it is possible to press the flange with the high-frequency coil and improve the reliability of fusion. Can do.

  Furthermore, a temperature sensor is arranged between the flexible sheet and the flange portion at the main pipe side end, and the current applied to the high-frequency coil is controlled using the signal of the temperature sensor, so that the fusion can be performed. Since it is possible to keep the temperature optimal, the reliability of fusion can be improved even when there is a change in the outside air temperature or the like.

  Further, by installing means for expanding the air and closing the pipe so that the high frequency coil is sandwiched in front and rear in the pipe axial direction of the main pipe into which the high frequency coil is inserted in the fused state in the pipe. It is possible to simplify the inspection of the branch part by sealing the main pipe with the means for closing after fusing and cooling, and closing the main pipe across the branch part, attaching a pressure diameter to the end of the branch pipe and injecting air. I can do it. Furthermore, when there is a leak, the high-frequency coil can be energized again and re-fused, so that the reliability of fusion can be improved.

As a result, it is possible to realize the fusion of the branch portion without non-cutting.
By constructing and operating the piping branch fusion device in this way, after repairing by inserting a new resin pipe made of resin into the main pipe and branch pipe of an old steel small-diameter pipe, The resin pipe inserted into the main pipe and the branch pipe can be fused, and the object of the present invention is achieved.

  According to the present invention, a new resin pipe is inserted into a conventional steel pipe, a branch portion is excavated and drilled from the outside of the pipe, and a saddle type branch joint is fused from the outside of the pipe for repair. The work to connect the main pipe and branch pipe of the renewed resin pipe can be performed without open cutting, which has the effect of shortening construction time and construction cost.

  Hereinafter, an embodiment in which the present invention is applied to fusion of a branch portion of a gas pipe will be described in detail with reference to the drawings. In addition, this invention is applicable also to the repair with respect to the buried piping for fluids other than gas.

An embodiment in which the present invention is applied to a gas pipe will be described with reference to FIGS.
First, with reference to FIG. 1 and FIG. 2, the overall configuration of the buried pipe branching portion fusion apparatus of the present invention and the concept of the buried pipe branching portion fusion method using this apparatus will be described. FIG. 1 is a diagram illustrating the entire configuration of the buried pipe branching portion fusion apparatus 100 according to the present embodiment in its actual operation state. FIG. 2 is a block diagram showing the configuration of the buried pipe branching portion fusion apparatus.

  The buried pipe 10 that is the target of the buried pipe branching portion fusion device 100 is branched from an existing buried main pipe 20 made of steel that is buried in the underground 40 and extends in the lateral direction, and an outer periphery of the buried main pipe 20. It consists of a plurality of existing branch pipes 30 made of steel that extend upward and are guided to the ground. The existing pipes 20 and 30 are small-diameter aging steel pipes having an inner diameter of about 20 mm to 200 mm, and a new main pipe constituting a new buried pipe by inserting a new resin pipe into the existing pipe. Existing pipes are repaired and updated by joining new branch pipes from inside the new main pipe. Reference numeral 45 denotes a construction excavation hole provided in the underground 40, and 22 denotes a pipe end portion of the existing buried main pipe 20 provided for the construction.

  Next, the detailed configuration and function of the buried pipe branching part fusion device 100 will be described with reference to FIG.

  The fusion head 105 includes a high-frequency coil 110 for heating a heater of a flange portion of a joint provided at the end of the new branch pipe, and air as a pressing means for pressing the high-frequency coil against the inner wall surface of the new main pipe. The bag 120, a tow rope 180 installed through the high frequency coil 110, a flexible sheet 190, a centering top 200 and a temperature sensor 210 installed on the tow rope.

  The high-frequency coil 110 is formed in a substantially disk shape by bending a hollow copper pipe into a spiral shape, and has a structure in which a high-frequency current is applied and at the same time circulating cooling water inside the copper pipe to cool it. When working in cold weather, use antifreeze instead of cooling water. Note that the outer diameter of the high-frequency coil is preferably substantially the same as the inner diameter of the new main pipe so that the high-frequency coil is pressed against the inner wall surface of the new main pipe without gaps. . Since the existing pipes 20 and 30 to be constructed change in an inner diameter range of about 20 mm to 200 mm, the high-frequency coil 110 has various sizes of outer diameters or curvatures so that these pipes can be accommodated in advance. Prepare several. The high frequency coil 110 and the cooling water circulation pipe may be configured as separate members, and both may be integrated.

  The temperature sensor 210 is disposed between the flexible sheet 190 and the flange portion at the buried pipe main pipe side end, and the detected temperature information is sent to the controller 132 via the signal line 168 and the interface 133. It is done.

  The high frequency unit 130 includes a high frequency power source 134 that supplies a high frequency current to the high frequency coil 110, and the output of the high frequency power source 134 is controlled by the controller 132. That is, the controller 132 controls the output of the high frequency power supply 134 in accordance with a preset procedure based on an operation command from the operator panel 131 or a signal input via the interface 133.

  The fusion head 105 and the high-frequency unit 130, and the airbag 120 and the compressor 150 that is a power source thereof are connected by a remote cable 160. That is, the remote cable 160 includes a cable 162 for supplying a high-frequency current, an air tube 164 for supplying air to the airbag, and a hose 166 for supplying cooling water to the high-frequency coil. It is configured to be inserted through a corrugated tube with Reference numeral 170 denotes a cable reel that winds and stores the remote cable 160.

  The compressed air of the compressor 150 is supplied to the airbag 120 via a switching valve 137 in the high frequency unit and a pressure reducing valve 138 that adjusts the pressure of the compressed air to be supplied. The compressed air in the airbag 120 can be discharged by switching the switching valve 137, and can be easily handled in a deflated state (first state) during insertion or collection. Moreover, since the pressure of the compressed air supplied to the airbag 120 can be freely changed by the pressure reducing valve 138, the surface pressure at the time of fusion (second state) can be set freely. The switching valve 137 and the pressure reducing valve 138 are configured to be operated by an operator, but may be controlled by the controller 132 via the operation panel 131.

  The pressing means for pressing the high-frequency coil against the inner wall surface of the new main pipe may be configured using other fluids such as a hydraulic actuator and a hydraulic pump.

  The cooling water of the cooling water unit 140 is supplied from the cooling water unit 140 to the matching box 136 in the high frequency unit 130 and is connected to the high frequency coil 110 via the hose 166 in the remote cable 160. With this connection, the coil in the matching box and the high-frequency coil 110 can be cooled.

  The signal from the temperature sensor 210 is taken into the controller 132 via the remote cable 160 and the interface 133 in the high-frequency unit, so that the temperature at the time of fusion of the branch portion is held at a constant value regardless of the working conditions. The current supplied from the high frequency power source to the high frequency coil 110 can be controlled.

  The temperature sensor 210 may be omitted, and the energization time from the high-frequency power source to the high-frequency coil 110 may be configured to be open-loop controlled by a timer. The energization time in this case is appropriately selected according to the temperature of the environment in which the fusion work is performed, the shape of the branch fusion joint, and the like based on data obtained in advance through experiments or the like. In this case, the signal line 168 and the interface 133 are not necessary.

  Next, the structure of the branch part fusion joint 36 is demonstrated using FIG. FIG. 3 is a three-side view of the branch portion fusion joint 36. The branch portion fusion joint 36 includes a cylindrical portion 37 and a flange portion 38. Since the flange portion 38 is thin with resin, it can be flexibly adapted along the inner wall surface of the smooth tube. In addition, a magnetic heater 39 is embedded in the flange portion 38 in a double concentric shape in advance, and a high-frequency current is passed through the high-frequency coil 110 in a state where the flange portion 38 is pressed against the inner wall surface of the smooth tube with an appropriate surface pressure. Then, an induction current is generated in the heater 39, and the heater 39 generates heat due to the Joule heat and the hysteresis loss due to the alternating magnetic field.

  Next, the configuration of the fusion head 105 and the operation of the fusion head at the time of fusion at the branch portion will be described with reference to FIGS. FIG. 4A is a diagram showing a state in the middle of inserting the resin branch pipe 35 and the fusion head 105 into the existing branch pipe, and FIG. FIG.

  The existing main pipe 25 and the new branch pipe 35 are joined to the existing pipes 20 and 30 from the inside of the new main pipe 25 to repair and update the existing pipe. The new resin branch pipe 35 inserted into the existing branch pipe 30 is formed of a hollow pipe member, and a lower end portion thereof is a joint portion 35C to which a hollow branch portion fusion joint 36 is joined.

  A hole 26 is made in the new resin smooth tube 25 inserted into the existing main pipe 20 using a punching device or the like. Needless to say, the diameter of the perforated hole 26 is sufficiently smaller than the outer diameter of the flange portion 38 connected to the end portion 35 </ b> C of the resin branch pipe 35. Using a pulling wire (not shown), a flexible new resin branch pipe 35 in which a pulling rope 180 is inserted into the pipe in advance is pulled from the hole 26 into the existing branch pipe 30 while being pulled by the wire (FIG. 4). (A)), until the flange portion 38 of the branch portion fusion joint 36 connected to the end portion of the resin branch pipe 35 is caught in the perforated hole 26 of the smooth tube 25. Further, by pulling only the pulling rope 180 from the branch pipe end portion 31, the centering top 200 is drawn into the branch portion fusion joint 36 as shown in FIG. 4B, and the fusion head 105 is further moved to the branch portion. Positioning is performed directly below the fusion joint 36. The fusion head 110 is held on the airbag 120 in a contracted state (first state) of the airbag in which no air is supplied to the airbag 120.

  The outer diameter of the centering top 200 is larger than the inner diameter of the joint portion 35C of the cylindrical portion 37 of the branch portion fusion joint 36 and the resin branch pipe 35, and the centering top is caught and stopped at this position. FIG. 5A is a diagram showing the branching portion in this state. The outer edge portion of the flange portion 38 of the branch portion fusion joint 36 is in contact with the inner wall of the new resin smooth tube 25. In addition, the branch part fusion joint 36 joins the resin branch pipe 35 to the cylindrical part by butt fusion in advance, and is used for the branch part fusion in a state as shown in FIG.

  In this state, by supplying air of a predetermined pressure to the airbag 120 and extending (second state), pressing the high frequency coil 110 with the flexible sheet 190 sandwiched between the smooth tube inner wall surface, A surface pressure required at the time of fusion can be generated between the inner wall surface of the smooth tube and the branch portion fusion joint flange (FIG. 4C). Since the flange portion 38 of the branch portion fusion joint 36 is thin with resin, it is deformed along the inner wall surface of the new resin smooth tube 25. Since the flexible sheet 190 is interposed between the high frequency coil 110 and the flange portion 38, the high frequency coil 110 can be flexibly adapted to the surface of the flange portion 38 (FIG. 5B). Instead of the flexible sheet 190, another cushion absorbing member may be arranged.

  A magnetic heater 39 is embedded in the flange portion 38 of the branch portion fusion joint 36. When a high-frequency current is passed through the high-frequency coil 110 in a state where the flange portion 38 is pressed against the inner wall surface of the smooth tube with an appropriate surface pressure. An induced current is generated in the heater 39, and the heater 39 generates heat due to Joule heat and hysteresis loss due to the alternating magnetic field. With this heat generation, both the inner wall surface of the new smooth tube 25 and the flange surface of the branch portion fusion joint 36 are melted and pressed together with an appropriate surface pressure to fuse them.

  Next, the fusion procedure using the branching part fusion | melting apparatus 100 is demonstrated using FIGS. 6-7. FIG. 6 is a flowchart showing the fusing procedure, and FIG. 7 is an explanatory diagram showing the state of the branching part in the middle of the fusing procedure.

(S610): The insertion rope 182 is passed from the existing branch pipe 30 through the perforated hole 26 and through the new smooth pipe 25 using a parachute or the like used for normal piping work. (Fig. 7 (a))
(S620): The tow rope 180 attached to the high frequency coil is inserted into the new resin branch pipe 35 and fixed to the wire for towing the resin branch pipe. A branch portion fusion joint 36 is connected to the lower end portion of the resin branch pipe 35 in advance.
(S630): The insertion rope 180 and the wire that pulls the resin branch pipe 35 are connected, and the resin branch pipe 35 is pulled into the resin main pipe 25 by pulling the insertion rope 180 from the branch pipe side. . At this time, the fusion head 105 is also inserted into the resin main pipe 25 by pushing the remote cable 160.

(S640): The resin branch pipe 35 is pulled into the resin main pipe until the flange 38 of the branch portion fusion joint 36 is caught in the hole 26 of the resin main pipe 25. At this time, the branch part is confirmed by the in-tube camera 300 (FIG. 7B).
(S650): Further, the remote cable 160 is operated to push the high-frequency coil 110 down to the lower part of the joint (FIG. 7C).
(S660): The operator on the branch pipe side pushes and pulls the remote cable 160 on the main pipe insertion side while pulling the tow rope 180, and the operator melts by wireless communication and the response of the operator on the branch pipe side. The positioning of the landing head 105 is determined.

(S670): Air of a predetermined pressure is supplied to inflate the airbag 120, and the fusion joint flange 38 is pressed against and fixed to the inner wall surface of the new main pipe 25 by the high-frequency coil 110 (FIG. 7D). ).
(S680): While supplying cooling water to the high frequency coil 110, a high frequency current is applied for a predetermined time. As described above, when a high frequency current is applied to the high frequency coil 110 with the flange portion 38 pressed against the inner wall surface of the smooth tube 25 with an appropriate surface pressure, an induction current is generated in the heater 39, and the Joule heat and the alternating current at that time are generated. The heater 39 generates heat due to hysteresis loss due to the magnetic field. With this heat generation, both the inner wall surface of the new main pipe 25 and the flange surface of the branch portion fusion joint 36 are melted, and both are fused.

(S690): After energization is completed, the compressed air is kept supplied to the airbag 120, and the branch portion is cooled. Thereafter, the airbag 120 is evacuated, and the remote cable 160 is pulled from the main pipe side to collect the high-frequency coil 110 (FIG. 7E).
(S700): The in-pipe camera 300 is inserted into the pipe, and the fused state of the branch portion is confirmed.

  According to the above procedure, it is possible to perform the fusion of the branch portion of the new resin pipe 25 inserted into the existing steel pipe 20 by non-cutting.

  Further, the longitudinal cross-sectional shape of the portion of the high frequency coil that contacts the inner wall surface of the main pipe is an arc shape corresponding to the inner wall surface of the new resin pipe 25 as shown in FIG. The flange portion 38 of the branch portion fusion joint can be deformed and held along the inner wall surface of the resin main body by being sandwiched between the inner wall surface of the resin main tube 25 and the high frequency coil. Stable fusion is possible.

  Furthermore, by making the area of the high-frequency coil in contact with the flange larger than the area of the flange when pressing the flange, even if the resin branch pipe center and the center of the high-frequency coil are displaced, It is possible to press against the surface of the steel sheet, thereby preventing poor fusion due to insufficient surface pressure and improving the reliability of fusion.

  Furthermore, a temperature sensor is arranged between the flexible sheet and the flange portion at the main pipe side end, and the current applied to the high-frequency coil is controlled using the signal of the temperature sensor, so that the fusion can be performed. Since it is possible to keep the temperature optimal, the reliability of the fusion can be improved because the temperature of the fusion part can be kept optimum even when there is a change in the outside air temperature due to a difference in season.

  In actual construction, it is desirable to perform a hermetic test after fusion in addition to the fusion procedure according to the first embodiment described with reference to FIGS. FIG. 8 is an explanatory view showing a state of an airtight test after fusion.

  That is, in the state where the air of the airbag is removed after cooling of S690 in FIG. 6, the end of the pipe is closed as shown in FIG. 8 (a), and air pressure is applied to the resin pipe to make the new resin pipe airtight. Check. According to this method, even if a fusing defect occurs, the high-frequency coil can be fixed again by applying pressure to the airbag again, and the reliability of fusing can be improved.

  Also, if the pipe behind the branch part of the resin main pipe is long, as shown in FIG. 8 (b), use a fusion head equipped with a packer at the tip of the fusion head in advance and supply air after fusion. If the airtight test is performed by inflating the packer and closing the resin main tube, the airtight test can be performed more easily. In this case, in FIG. 1, among the plurality of branch pipes 30 that are branched from the outer periphery of the buried main pipe 20 and extend upward, the branch pipe from the front side to the back as seen from the side where the buried pipe branching unit fusion device 100 is located. It is desirable to perform fusion work one after another and perform an airtight test.

  As described above, according to the present invention, a resin pipe is inserted into an aged steel pipe, a main pipe branch portion is drilled, a resin branch pipe is inserted, and a resin main pipe and a resin branch pipe are embedded from the inside of the pipe in an embedded state. Can be fused, and the construction time, construction cost, and excavated soil can be reduced.

Explanatory drawing which shows the external appearance of the buried pipe branch part melt | fusion apparatus which is one Example. Explanatory drawing which shows the detailed structure of a buried pipe branch part fusion | fusion apparatus. Explanatory drawing which shows the branch part melt | fusion joint welded with a buried pipe branch part melt | fusion apparatus. Explanatory drawing which shows arrangement | positioning of the branch part of a buried pipe branch part fusion | fusion apparatus. Explanatory drawing which shows an actual positioning normal state and a fusion | melting state of a buried pipe branching part fusion | fusion apparatus. The flowchart which shows the procedure of a branch part melt | fusion. Explanatory drawing which shows the procedure until a branch part fusion | fusion. Explanatory drawing which shows the state of the airtight test after a branch part melt | fusion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Embedded pipe, 20 ... Existing main pipe, 30 ... Existing branch pipe, 100 ... Embedded pipe branch part fusion | fusion apparatus, 110 ... High frequency coil, 120 ... Air bag, 130 ... High frequency unit, 140 ... Cooling water unit, 150 ... Air compressor, 160 ... remote cable, 170 ... cable reel, 180 ... tow rope, 190 ... flexible sheet, 200 ... centering top.

Claims (10)

The new buried pipe is used for the buried pipe construction for renewing the existing buried pipe aged by inserting the new buried pipe made of resin into the existing buried pipe made of steel consisting of the existing main pipe and the existing branch pipe. A device for joining a new main pipe and a new branch pipe constituting the main pipe from the inside of the new main pipe,
A high frequency coil for generating an induction current in the heater of the flange portion of the joint installed at the end of the new branch pipe, and a pressing means for pressing the high frequency coil against the inner wall surface of the new main pipe. The landing head,
A high frequency unit having a power supply for supplying a high frequency current to the high frequency coil;
A power source for operating the pressing means;
A remote cable connecting the high-frequency coil and the power source, and the pressing means and the power source, respectively .
The fusion head includes a rope connected to the center of the high-frequency coil, and a top having a diameter larger than the inner diameter of the new branch pipe and smaller than the inner diameter of the joint provided at the end of the new branch pipe. And
The buried pipe branching portion fusion device, wherein the cords penetrate the top . The buried pipe branching part fusion device according to claim 1,
The embedded pipe branching portion fusion device, wherein the pressing means is an airbag, and an air tube for supplying air from the compressor as the power source to the airbag is disposed in the remote cable. The buried pipe branching part fusion device according to claim 1,
The vertical section of the high-frequency coil has a substantially arc shape with a central portion protruding upward, and the buried pipe branching portion fusion device. The buried pipe branching part fusion device according to claim 3,
The high frequency coil is formed of a hollow pipe, and has a hose disposed in the remote cable for supplying a cooling fluid for the high frequency coil from a cooling water unit of the high frequency unit. Embedded pipe branching part fusion device. The buried pipe branching part fusion device according to claim 1,
The fusing head has a temperature sensor;
The buried pipe branching portion fusion device , wherein the high frequency unit controls a current applied to the high frequency coil using a signal from the temperature sensor . The new buried pipe is used for the buried pipe construction for renewing the existing buried pipe aged by inserting the new buried pipe made of resin into the existing buried pipe made of steel consisting of the existing main pipe and the existing branch pipe. A device for joining a new main pipe and a new branch pipe constituting the main pipe from the inside of the new main pipe,
A high frequency coil for generating an induction current in the heater of the flange portion of the joint installed at the end of the new branch pipe, and a pressing means for pressing the high frequency coil against the inner wall surface of the new main pipe. The landing head,
A high frequency unit having a power supply for supplying a high frequency current to the high frequency coil;
A power source for operating the pressing means;
A remote cable connecting the high-frequency coil and the power source, and the pressing means and the power source, respectively.
The fusion head has a flexible sheet that is penetrated by a cord-like body so as to be disposed between the high-frequency coil and the flange portion of the joint, and the flexible sheet is interposed between the flexible sheet and the flexible sheet. The buried pipe branching portion fusion device, wherein an area of the high-frequency coil in contact with the flange portion is larger than an area of the flange portion. The buried pipe branching part fusion device according to claim 6,
The fusing head has a temperature sensor disposed between the flexible sheet and the flange portion,
The buried pipe branching portion fusion device, wherein the high frequency unit controls a current applied to the high frequency coil using a signal from the temperature sensor. A new main pipe and a new branch pipe are constructed by inserting a new resin-made buried pipe into the existing main pipe and existing branch pipe made of steel, and constituting the new buried pipe by the buried pipe branching unit fusion device. Is a buried pipe branching portion fusion method for renewing an existing buried pipe that has been aged by joining the inside of the new main pipe,
The buried pipe branching portion fusion device includes a high frequency coil for generating an induction current in a heater of a flange portion of a joint installed at an end of the new branch pipe, and the high frequency coil on the inner wall surface of the new main pipe. A fusion head having a pressing means for pressing, a high-frequency unit having a power supply for supplying a high-frequency current to the high-frequency coil, a power source for operating the pressing means, the fusion head, the high-frequency unit, and the A remote cable connecting each of the pressing means and the power source,
The fusion head includes a rope connected to the center of the high-frequency coil, and a top having a diameter larger than the inner diameter of the new branch pipe and smaller than the inner diameter of the joint provided at the end of the new branch pipe. And the cord is penetrating the top,
Connect the joint having the flange portion where the heater is installed to the end of the main branch side of the new branch pipe,
In the first state in which the pressing means is reduced , using the cord-like body, the fusion head is inserted together with the remote cable from the opening of the new main pipe and below the new branch pipe,
By pressing the high-frequency coil against the inner wall surface of the new main pipe through the flange portion by setting the second state in which the pressing means is extended,
A buried pipe characterized in that, in the pressed state, a high-frequency current is applied to the high-frequency coil to generate an induction current in a heater of the flange part, and the flange part is fused to the inner wall surface of the new main pipe. Branch part fusion method. The buried pipe branch portion fusion method according to claim 8,
The pressing means is an air bag, and an air tube for supplying air from a compressor for supplying air to the air bag is provided in the remote cable,
The high-frequency coil is composed of a hollow pipe,
In the first state where the airbag is reduced , using the cord-like body, the fusion head is inserted together with the remote cable from the opening in the new main pipe below the new branch pipe,
By supplying air through the air tube and inflating the airbag, the second state is established, and the high-frequency coil is pushed up and the flange portion is pressed against the inner wall surface of the new main pipe and fixed. And
While supplying cooling water to the high-frequency coil in the fixed state, a high-frequency current is applied for a predetermined time to fuse the flange portion to the inner wall surface of the new main pipe,
After completion of energization, holding the fusion head in the second state in which compressed air is supplied to the airbag, cooling is performed,
Thereafter, in the first state in which the air from the airbag has been removed, the remote cable is pulled from the opening of the new main pipe to collect the fusion head, and the buried pipe branch part fusion Method. The buried pipe branch portion fusion method according to claim 8,
Installing a closing means for closing the pipe by expanding with air so as to sandwich the high-frequency coil between the front and rear of the main pipe into which the high-frequency coil is inserted in the fused state in the pipe; A method for fusing buried pipe branch parts, wherein air is inserted from an end part of the branch pipe to perform an airtight inspection.

Images