JP5469910B2 - Closure member and adsorption device for closure member - Google Patents

Description

  The present invention relates to a sealing member for closing a perforated hole drilled in a synthetic resin pipe, particularly a synthetic resin gas pipe for supplying a fuel gas such as city gas, and a closing member used for closing the perforated hole. The present invention relates to an adsorbing device for a closing member for pulling out a plug made of a magnetic material constituting the closing member from a member by using magnetic force.

  In recent years, gas pipes for supplying fuel gas such as city gas and LP gas (hereinafter simply referred to as “city gas”) to consumers (general households and various offices) are made of synthetic resin such as polyethylene. A tube is used. Most of the gas pipes are buried underground.

  When laying a gas pipe for a new customer, after drilling a hole for connecting the branch pipe to the existing gas pipe, it is for branching so as to surround this drilled hole (hereinafter referred to as “drilled hole”) A method is adopted in which a joint is fixed to the surface of an existing gas pipe, and the branch pipe is connected to the branch joint.

  In addition, when repairing an existing gas pipe, a bypass pipe is connected to the section of the gas pipe to be repaired so that the supply of gas through the gas pipe is not stopped, and city gas is supplied through the bypass pipe. In addition, the gas pipe is repaired while the supply of gas to the repaired portion of the gas pipe is stopped. At this time, a hole for connecting the branch joint is formed in the gas pipe connecting the bypass pipe, and the bypass pipe is connected to the branch joint. When the repair of the gas pipe is completed, the connected bypass pipe is removed.

  Since the branch pipe joint is connected to the gas pipe from which the bypass pipe is removed, it is desirable to remove the branch joint from the gas pipe. When the branch joint is removed from the gas pipe, the gas pipe is left with the perforated hole connected to the branch joint. In order to prevent gas leakage from the perforated hole remaining in the gas pipe, a gas plug is eliminated by inserting a seal plug (hereinafter referred to as “blocking member”) into the perforated hole. Furthermore, as a gas pipe repair method for reliably preventing gas leakage from the perforated hole, a repair method described in Patent Document 1 below has been proposed. In Patent Document 1, a synthetic resin repair saddle is fused to the outer peripheral surface of a synthetic resin gas pipe so as to surround an upper portion of a blocking member inserted into the drill hole, thereby preventing gas leakage from the hole. Is disclosed.

  The above-mentioned synthetic resin repair saddle is a member that is heat-sealed to the outer peripheral surface of the synthetic resin gas pipe, and leaked even if a gas leak occurred from the perforated hole into which the closing member was inserted. It is a member used to prevent gas from flowing out.

  An outline of a repair saddle conventionally used is shown in FIG. 9 and FIG. The repair saddle 12 includes a planar outer protrusion 12a that protrudes outward, and a saddle portion 12b that is a portion that is heat-sealed with the outer peripheral surface of the gas pipe and has a circular cross section. Moreover, the space part 13 is formed in the downward part of the inner surface 12c of this outer side protrusion part 12a by the outer side protrusion part 12a. Furthermore, a heating wire 12d is embedded in the saddle portion 12b, and electrodes 12e and 12f for supplying predetermined power to the heating wire 12d are disposed on the outer surface of the saddle portion 12b. In general, the cross-sectional shape of the outer protrusion 12a is circular.

  Patent Document 2 below proposes a method for removing a resin branch pipe. Patent Document 2 describes that a permanent closure made of polyethylene is fused to a tapping hole drilled in a main pipe using rotational frictional heat using a closing tool having a rotating rod. . Further, Patent Document 2 describes that a temporary stopper provided with an O-ring on the side peripheral surface is attached to the tapping hole and sealed before the main stopper is fused to the tapping hole.

  In addition, a sealing member (blocking member or plug) for sealing a cavity such as a perforated hole is formed of a magnetic material, and the sealing member is moved in the direction of the cavity and away from the cavity by using magnetic force. A technique for sealing the cavity by moving it and opening the sealed state is proposed in Patent Document 3 below. In this patent document 3, a container to be evacuated to vacuum can be freely sealed and opened with a sealing member made of a magnetic material by remote control of a connecting portion communicating with the exhaust pipe by using the magnetic force of an electromagnet. Is disclosed.

JP-A-9-49596 JP 2002-295724 A JP-A-5-26372

  In Patent Document 1, a hole drilled to connect a branch joint to a synthetic resin gas pipe is inserted into the drilled hole after the gas pipe is repaired to eliminate gas leakage. There has been proposed a technique for repairing a gas pipe by fusing a synthetic resin repair saddle to the outer peripheral surface of the synthetic resin gas pipe so as to surround the upper portion of the closing member. However, Patent Document 1 discloses a means for ensuring that the gas tightness is completely achieved by fusing the repair saddle and the gas pipe and that no gas leaks from the inside of the repair saddle to the outside. Not.

Incomplete fusion between the repair saddle and the synthetic resin gas pipe, for example, even if a minute gap is formed in the fusion part where the repair saddle and the gas pipe are joined by heat fusion, If the closing (sealing) is securely performed, gas leakage from the inside of the repair saddle (the space portion 13) to the outside through the minute gap does not occur. Moreover, the blockage of the perforated hole by the blocking member is only for the purpose of temporary sealing. It is conceivable that the closing member that closes the perforated hole deteriorates over time due to various components contained in the city gas. Accordingly, the city gas leaks from the deteriorated blocking member, and the leaked city gas flows out into the space 13 formed by the repair saddle and the gas pipe. Furthermore, the city gas that has flowed into the space 13 leaks from the inside of the repair saddle to the outside if the fusion between the repair saddle and the gas pipe is incomplete.
For this reason, as described above, when the repair work of the drilled hole drilled in the gas pipe is completed, the quality of the airtightness due to the fusion of the repair saddle and the gas pipe is reliably and reliably determined. A means for achieving this is desired.

  The invention described in Patent Document 2 uses a closing tool equipped with a rotating rod to fuse a polyethylene main stopper to a tapping hole drilled in a main pipe using rotational frictional heat. A method for removing a branch pipe that closes a tapping hole is disclosed. However, Patent Document 2 does not describe that the tapping hole is more completely closed by fusing a repair saddle to a synthetic resin main pipe so as to surround the main stopper.

  In the invention described in Patent Document 3, a seal member for sealing a cavity portion drilled in a vacuum vessel is formed of a magnetic material, and this seal member is remotely operated in the direction of the cavity portion and using magnetic force. Although it is disclosed that the cavity is sealed by moving in a direction away from the cavity, and this sealed state is released, the technique for sealing a hole drilled in a gas pipe supplying city gas or the like is targeted. It is not a thing.

  Accordingly, an object of the present invention is to repair a perforated hole drilled in a synthetic resin pipe, and insert a closing member into the perforated hole and fuse a repair saddle to the synthetic resin pipe from above the closing member. In the repair method that employs the sealing member, the sealing member that can easily and reliably determine the quality of the airtightness due to the fusion of the repair saddle and the synthetic resin tube, and the hole used to close the hole. An object of the present invention is to provide an adsorbing device for a closing member for pulling out a plug made of a magnetic material constituting the closing member from the closing member by using a magnetic force.

In order to solve the above-described problem, the closing member according to claim 1 is a closing member that is inserted into a perforated hole formed in a synthetic resin tube and closes the perforated hole. ,
A diameter-enlarging member made of a non-magnetic material having a through-hole formed in the insertion direction and mounting an outer plug made of a non-magnetic material elastic member on the outer peripheral surface; The through hole has a lower hole portion whose lower end is located inside the synthetic resin tube with the closing member inserted in the perforated hole, and an inner diameter larger than the lower hole portion following the lower hole portion. And an inner plug body made of a magnetic member that is movably disposed in the through hole by fitting a seal member. The inner plug body is fitted to the inner plug body. When the sealed member is positioned in the lower hole, the communication between the lower hole and the upper hole is sealed by the seal member.

  The invention according to claim 2 relates to the closing member according to claim 1, wherein the inner plug is inserted into the through hole and the plug member is fitted into the seal member; and the plug A suction plate made of a magnetic material coupled to one end of the body portion is provided, and the suction plate is disposed outside the through hole.

  According to a third aspect of the present invention, there is provided a closing member for applying a magnetic force to the closing member according to any one of the first to second aspects, wherein the closing member is inserted into a perforated hole perforated in a synthetic resin pipe. A suction member for a closing member, wherein the suction device for a closing member includes a permanent magnet having magnetic poles formed on a pair of opposing side surfaces, a vertical movement moving means for moving the permanent magnet from an initial position toward the closing member, And a yoke disposed at a predetermined distance from the magnetic pole corresponding to the initial position of the permanent magnet.

  According to a fourth aspect of the present invention, there is provided the closing member adsorption device according to the third aspect, wherein the vertical movement moving means includes an urging means for applying an action of returning the permanent magnet toward the initial position. It is characterized by having.

The present invention can exhibit the following effects.
(1) The closing member according to the present invention includes an inner plug body made of a magnetic material. Thereby, in repairing the perforated hole drilled in the synthetic resin pipe, a method is adopted in which a closing member is inserted into the perforated hole and the repair saddle is fused to the synthetic resin pipe from above the closing member. In the repair method, by using a closing member provided with the inner plug having the magnetic body according to the present invention as the closing member, when the magnetic force is applied to the closing member from above the repair saddle, the inner plug is By moving in the repair saddle direction by the magnetic force, a fluid such as city gas flowing in the synthetic resin pipe can flow out into the repair saddle. For this reason, the closing member of the present invention is to confirm the quality of the fusion between the repair saddle and the synthetic resin tube surely and easily as soon as the repair work of the hole drilled in the synthetic resin tube is completed. It is possible to provide a closing member capable of

  (2) The through-hole formed in the diameter-expanding member has a lower hole formed on the side of the hole drilled in the gas pipe, and the upper hole following the lower hole and below the lower hole. And an upper hole having a large inner diameter. Thereby, when pulling out only the inner plug body from the closing member by the action of magnetic force, for example, even if a problem occurs that the inner plug body cannot be pulled out halfway, the lower hole portion and the upper hole portion are Since they communicate, there is no problem in confirming whether the gas pipe 10 and the repair saddle 12 are fused properly.

  (3) The closing member adsorbing device according to the present invention is installed on the upper surface of the outer protruding portion 12a of the repair saddle 12, and then the permanent magnet provided in the closing member adsorbing device is operated from the initial position to the vertically moving moving means. Then, only the inner plug body can be pulled out from the closing member using a magnetic force by a simple operation of moving in the direction of the closing member. Thereby, it is possible to improve the efficiency of the repair work of the gas pipeline.

It is sectional drawing for demonstrating the structure of the embodiment about the closure member which concerns on this invention. It is a perspective view which shows the member which comprises a closure member about the closure member shown in FIG. It is a top view for demonstrating the shape of the upper surface part about the diameter expansion member shown in FIG. It is a fragmentary sectional view for demonstrating a state when the obstruction | occlusion member shown in FIG. 1 is inserted in this perforation hole in order to repair the perforation hole perforated in the gas pipe. In the state shown in FIG. 4, it is a fragmentary sectional view for demonstrating a state when only the inner side plug which comprises a closure member is extracted from a closure member, and is moved to the F direction. In the state shown in FIG. 4, it is a fragmentary sectional view for demonstrating the other state when only the inner side plug which comprises a closure member is extracted from the closure member, and is moved to the F direction. It is sectional drawing for demonstrating the structure about the adsorption | suction apparatus for obstruction | occlusion members which concerns on this invention, Comprising: It is a figure which shows the initial state before use. It is a figure which shows the state at the time of use about the adsorption | suction apparatus for obstruction | occlusion members shown in FIG. It is a fragmentary cross-sectional view for demonstrating the structure of a repair saddle. Similarly, it is a partial longitudinal cross-sectional view for explaining the configuration of the repair saddle.

  When repairing a polyethylene gas pipe supplying city gas to a consumer, as described above, a drilling hole for connecting a bypass pipe (or hose) to the gas pipe is drilled in the drilling tool. When the repair work is completed, the sealing member is inserted into the perforated hole to be sealed, and the repair saddle is fused to the outer peripheral surface of the gas pipe so as to cover the blocking member inserted into the perforated hole from above. The The closing member according to the present invention relates to the configuration of the closing member.

  Further, in order to confirm (determine) whether or not the gas pipe and the repair saddle are securely fused, after the repair work is completed, for example, the gas pipe and the repair saddle are joined by heat fusion. It is confirmed by the presence or absence of foam by flowing soapy water around the joint. When such a repair method is adopted for a perforated hole drilled in a gas pipe, even if the gas pipe and the repair saddle are incompletely fused, if the perforated hole is sealed by the closing member, the gas pipe It cannot be confirmed whether or not the fusion between the repair saddle and the repair saddle has been made.

  The adsorbing device for an obstructing member according to the present invention is provided for the obstructing member according to the present invention inserted into a perforated hole when determining whether or not the gas pipe and the repair saddle are fused after performing the above-described repair work. And a device having means for forming a flow path through which a part of the city gas flowing in the gas pipe can pass using magnetic force, and the repair work related to the perforated hole is reliably performed. And it is an apparatus for determining easily.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. First, an embodiment of a closing member (stopper) according to the present invention will be described.

(Embodiment of closing member)
FIG. 1 is a longitudinal sectional view showing an embodiment of a closing member 1 according to the present invention, and FIG. 2 is a perspective view for explaining the shape of each member constituting the closing member 1 shown in FIG. 3 and 4 are cross-sectional views showing a state when the closing member 1 shown in FIG. 1 is inserted into the perforated hole in order to close the perforated hole formed in the gas pipe.

  As shown in FIGS. 1 and 2, the closing member 1 includes an outer plug body 2, a diameter-expanding member 3, an inner plug body 4, and an O-ring 5 serving as a seal member fitted to the inner plug body 4. It is configured. The closing member 1 is inserted into a perforated hole perforated in the gas pipe from the lower part of the paper surface shown in FIG.

  The outer plug body 2 is made of a ring-shaped synthetic rubber having moderate elasticity, for example, NBR (Nitril Butandiene Ruber). As shown in FIG. 1, the inner diameter of the through hole 2a provided in the ring-shaped outer plug 2 is made slightly larger than the inner diameter of the lower inner diameter portion 2c, and the lower side Protruding portions 2d and 2e are formed on the upper and lower ends of the inner diameter portion 2c so as to project in an annular shape inward from the inner peripheral surface thereof. Further, a flange (flange) 2f having a predetermined thickness protruding outward with respect to the through hole 2a is formed on one end (upper end) of the outer plug body 2, and further, the flange 2f A cylindrical outer peripheral surface portion 2g having an outer diameter smaller than the outer diameter of the flange portion 2f is formed below the lower portion. The outer peripheral surface portion 2g is a portion that comes into close contact with the inner peripheral surface of the drilled hole drilled in the gas pipe. In addition, the outer diameter of the outer peripheral surface portion 2g is slightly larger than the inner diameter of the drilled hole formed in the gas pipe, for example, about 0.5 mm to 1.5 mm.

The diameter-expanding member 3 has a vertically long ring shape, and is made of a hard synthetic resin such as polyethylene, which is a non-magnetic material. The height H2 of the diameter expanding member 3 is set higher than the height H1 of the outer plug 2. The diameter-expanding member 3 has a through hole 3a formed in the height direction. As shown in FIG. 1, the through hole 3 a has a hole portion 3 b whose diameter is larger from the vicinity of the middle portion in the height direction than the lower portion. That is, the through hole 3a is a through hole in which an upper hole 3b and a lower hole 3c having a diameter smaller than that of the hole 3b form a step 3d. This step portion 3d forms an upper hole portion 3b as a side flow path provided in the axial direction on a part of the inner peripheral surface in the vicinity of the intermediate portion of the through hole 3a or so as to be formed on the entire circumference in the axial direction. . Thereby, as shown in FIG. 3, the width | variety of the upper hole 3b is larger than the internal diameter of the lower hole 3c.
FIG. 1 shows a state in which the plug portion 4a of the inner plug 4 is completely inserted into the through hole 3a.

  Further, as shown in FIG. 2, an upper outer peripheral surface 3e and a lower outer peripheral surface 3f are formed on the outer peripheral surface of the diameter expanding member 3, and the outer diameter of the upper outer peripheral surface 3e is changed to the outer diameter of the lower outer peripheral surface 3f. It is slightly larger. When the closing member 1 is assembled, the lower inner diameter portion 2c of the outer plug body 2 is inserted into the lower outer peripheral surface 3f so that they are in close contact with each other. It is inserted into the upper inner diameter part 2b.

  The inner plug body 4 is partly or entirely made of a ferromagnetic material such as SS400 (general structural rolled steel), and has a T-shaped cross section. As shown in FIG. 1, the inner plug body 4 has a rod-shaped plug body portion 4a having a circular cross section, a groove portion 4b formed in the plug body portion 4a, and one end portion (upper end portion) of the plug body portion 4a. A suction plate 4c having a flat surface formed on the surface is provided. The groove 4b formed in the plug body 4a is an annular groove for inserting and fitting the O-ring 5 therein. Note that when the closing member 1 is assembled, the bottom surface of the suction plate 4c is shown in FIG. 1 when the plug body portion 4a of the inner plug body 4 is completely inserted into the through hole 3a of the diameter expanding member 3. In this manner, the diameter-expanding member 3 is brought into contact with the upper end surface 3b. Further, the inner diameter of the hole 3c below the through hole 3a is slightly larger than the outer diameter of the plug body 4a so that a minute gap is generated when the plug body 4a is inserted into the through hole 3a. The O-ring 5 inserted into the groove 4b is slidably brought into contact with the inner peripheral surface of the lower hole 3c, and serves as a seal member that ensures the airtightness of the gap between the plug body 4a and the lower hole 3c. Become.

  As described above, FIG. 1 shows a state in which the entire length of the plug body portion 4a of the inner plug body 4 is completely inserted into the through hole 3a, that is, the O-ring 5 inserted into the groove portion 4b has an inner periphery of the lower hole portion 3c. In close contact with the surface, the inner plug 4 shows a state where the hole 3c below the through hole 3a is sealed. Thus, in the state where the inner plug 4 seals the lower hole 3c and the communication between the lower hole 3c and the upper hole 3b is blocked, the position of the O-ring 5 is higher than the step 3d. The groove part 4b is provided in the plug body part 4a so as to be positioned below.

  The inner plug body 4 shown in FIG. 1 shows an example in which both the plug body portion 4a and the suction plate 4c are made of a magnetic material such as SS400 and integrated, but the suction plate 4c is made of a magnetic material such as SS400. The plug body 4a may be a non-magnetic material (metal or synthetic resin), and both may be integrated by screw bonding or adhesion.

  The shape of the flat surface of the suction plate 4c may be circular in a plan view as shown in FIG. The width of the flat surface is set to at least 1.5 times the width of the cross section of the plug body 4a. When the width of the flat surface of the suction plate 4c is set to be large in this way, as will be described later, when the suction plate 4c receives a magnetic force from a permanent magnet from above, it receives a stronger suction force. In this way, the inner plug body 4 easily moves in the F direction (showing the direction opposite to the direction in which the closing member 1 is inserted into the gas pipe 10) shown in FIG. The plug part 4a slides in the through hole 3a and moves in the F direction.

  As described above, in order for the inner plug body 4 to be able to move in the F direction in the through hole 3a by receiving the magnetic force adsorption action, the O-ring 5 inserted into the groove 4b is formed on the inner peripheral surface of the through hole 3a. The material of the O-ring 5 and the shape of the surface portion thereof are set so that the acting surface pressure is appropriate.

  The procedure for assembling the closing member 1 composed of the outer plug body 2, the enlarged member 3, the inner plug body 4, and the O-ring 5 serving as a seal member is described in, for example, the following (1) to (3). Can be assembled according to the procedure.

(1) The O-ring 5 is inserted into the groove portion 4b formed in the plug body portion 4a of the inner plug body 4.
(2) The diameter expanding member 3 is inserted into the through hole 2 a of the outer plug 2. At this time, as shown in FIG. 1, the inner diameter of the lower inner diameter portion 2 c of the outer plug body 2 is slightly smaller than the outer diameter of the lower outer peripheral surface 3 f of the expanded member 3. The lower inner diameter portion 2 c that is in close contact with the lower outer peripheral surface 3 f of the diameter expanding member 3. Further, the upper and lower ends of the lower inner diameter portion 2c of the outer plug body 2 are formed with projecting portions 2d and 2e that project in an annular shape inward from the inner diameter surface. The portions 2d and 2e are more closely attached to the lower outer peripheral surface 3f of the diameter expanding member 3. Thereby, the airtightness of the lower inner peripheral surface 2c of the outer plug 2 and the lower outer peripheral surface 3f of the diameter expanding member 3 is ensured.

  (3) The plug body portion 4a of the inner plug body 4 is inserted into the through hole 3a formed in the diameter expanding member 3. At this time, as shown in FIG. 1, the plug part 4a is completely inserted into the through hole 3a, and the O-ring 5 inserted into the groove part 4b is located below the step part 3d as shown in FIG. Thus, the O-ring 5 ensures airtightness between the hole 3c below the O-ring 5 and the plug body 4a. At this time, the lower surface of the suction plate 4c of the inner plug body 4 is brought into contact with the upper end surface 3b of the diameter-expanding member 3 as shown in FIG.

Subsequently, the state when the closing member 1 assembled in the above-described procedure is inserted into the perforated hole in order to repair the perforated hole perforated in the gas pipe will be described.
FIG. 4 is a cross-sectional view of the main part showing a state when the above-described closing member 1 is inserted into the perforated hole 11 perforated in the gas pipe 10. As shown in FIG. 4, when the closing member 1 is inserted into the perforation hole 11, the upper part protrudes from the outer peripheral surface of the gas pipe from the flange 2 f formed on the outer plug 2 of the closing member 1. .

  As described above, the perforated hole 11 shown in FIG. 4 is perforated to connect a bypass pipe (or hose) to the gas pipe 10 in order to repair the gas pipe 10 supplying city gas, for example. It is a hole. When the gas pipe 10 is repaired, the closing member 1 is inserted into the perforation hole 11 and the obstruction member 1 inserted into the perforation hole 11 in order to prevent gas leakage from the gas pipe 10 with certainty. The repair saddle 12 is fused to the outer peripheral surface of the gas pipe 10 so as to cover the closing member 1 from above. The cross-sectional shape of the inner peripheral surface of the perforated hole 11 is a circular shape.

  As shown in FIG. 4, the repair saddle 12 includes an outer protruding portion 12 a that protrudes outward, a saddle portion 12 b, and a heating wire 12 d (see FIG. 13) embedded in the inner periphery of the saddle portion 12 b. . Further, when the repair saddle 12 is fused to the outer peripheral surface of the gas pipe 10, the outer protruding portion 12 a provided in the repair saddle 12 causes a gap between the inner side surface 12 c of the outer protruding portion 12 a and the outer peripheral surface of the gas pipe 10. A space portion 13 is formed.

  As described above, the outer diameter of the outer peripheral surface portion 2 g formed on the outer plug 2 is set slightly larger than the inner diameter of the perforated hole 11. Therefore, in FIG. 4 which shows the state which inserted the outer peripheral surface part 2g of the outer side plug body 2 into the piercing hole 11 of a gas pipe, the outer side plug body 2 which consists of an elastic material is compressed by the inner peripheral surface of the piercing hole 11, The outer peripheral surface portion 2 g is in close contact with the inner peripheral surface of the perforated hole 11, and the lower inner diameter portion 2 c is in close contact with the lower outer peripheral surface 3 e of the diameter expanding member 3. Further, since the lower inner diameter portion 2c is provided with annular projecting portions 2d and 2e, the projecting portions 2d and 2e are in close contact with the lower outer peripheral surface 3f. The O-ring 5 inserted into the groove 4b of the inner plug 4 is in a state positioned below the step 3d.

  In this way, in FIG. 4 showing the state when the repair saddle 12 is fused to the outer peripheral surface of the gas pipe 10 and the repairing work related to the perforated hole 11 is completed, the O-ring 5 is located below the step portion 3d. Since it is located and is in close contact with the inner peripheral surface of the lower hole portion 3c, the city gas flowing in the gas pipe 10 enters the space portion 13 through the perforated hole 11, and further from the space portion 13 to the repair saddle 12. Measures are taken to prevent leakage to the outside.

  FIG. 5 shows the repair saddle 12 fused to the gas pipe 10 from above the closing member 1 inserted into the perforated hole 11 when the repair work related to the perforated hole 11 perforated in the gas pipe 10 is completed. In order to determine whether or not hermeticity is maintained by reliably fusing, only the inner plug body 4 having a member made of a magnetic body that constitutes the closing member 1 using magnetic force is used. The state when it moves to the F direction from the state shown in FIG. 4 is shown. In addition, the permanent magnet for making magnetic force act on the inner side plug body 4 is equipped with the adsorption | suction apparatus 20 for closure members (refer FIG. 7) which concerns on this invention mentioned later.

  From the state shown in FIG. 4, when a magnetic force is applied to the closing member 1 from the closing member suction device 20 disposed on the upper surface of the outer protrusion 12a of the repair saddle 12, as shown in FIG. The suction plate 4 c receives the suction force due to the magnetic force, and the inner plug 4 moves in the F direction by a distance L, and the upper surface of the suction plate 4 c contacts the inner side surface 12 c of the repair saddle 12. Thus, in order to pull out only the inner plug 4 from the closing member 1 by a magnetic force and move it in the F direction by a distance L, a suction force due to the magnetic force is applied to the suction plate 4c using a permanent magnet having a strong magnetic force. It is necessary to act. In addition, when the inner plug body 4 is moved in the F direction by a distance L, most of the length in the F direction of the plug body portion 4a of the inner plug body 4 remains in the through hole 3a.

  Further, as shown in FIG. 5, when only the inner plug body 4 is pulled upward by a distance L in the F direction using the magnetic force (pulled out), the inner plug body 4 is inserted into the groove 4 b of the inner plug body 4. As shown in FIG. 5, the O-ring 5 slides from the lower hole 3c to the upper part of the step 3d by sliding on the inner peripheral surface of the upper hole 3b. In order to perform such movement, it is necessary to appropriately set the moving distance L of the inner plug body 4, the position where the stepped portion 3d is provided, the position of the groove 4b for inserting the O-ring into the plug body 4a, and the like. There is.

  In FIG. 5 showing a state in which the inner plug body 4 is moved in the F direction by a distance L by the action of magnetic force, the O-ring 5 and the inner plug body 4 move from the lower hole portion 3c to the inner peripheral surface of the upper hole portion 3b. It slides and moves in the F direction and reaches the upper part of the step 3d. In this state, a slight gap is provided between the outer peripheral surface of the plug body portion 4a and the inner peripheral surface of the lower hole portion 3c, and the O-ring 5 has an inner diameter larger than that of the lower hole portion 3c. Therefore, there is no airtightness between the inside of the gas pipe 10 and the space 13, and the inside of the gas pipe 10 and the space 13 are communicated with each other. That is, a flow path is formed in which a small amount of city gas flowing in the gas pipe 10 flows into the space portion 13, and the city gas flowing through this flow path flows into the space portion 13.

  Generally, since the supply pressure of the city gas flowing through the gas pipe 10 is adjusted to 1.8 kPa to 3 kPa, when the city gas flows into the space portion 13, the pressure in the space portion 13 becomes slightly higher than the atmospheric pressure. Accordingly, in the state shown in FIG. 5, if the gas pipe 10 and the repair saddle 12 are incompletely welded and a minute gap is formed at the joint by the fusion, the space 13 The air accumulated in the air, the air containing city gas, or the city gas leaks out of the repair saddle 12.

Means for detecting whether or not city gas or the like has leaked to the outside from the joint between the repair saddle 12 and the gas pipe 10 is, for example, between the gas pipe 10 and the repair saddle 12 as conventionally performed. It is possible to visually check the presence or absence of bubbles by flowing soapy water around the joint by fusion.
As described above, in the present invention, when the repair work for the perforated hole 11 is completed, the closing member adsorbing device 20 according to the present invention is immediately attached to the upper surface portion of the outer protruding portion 12a of the repair saddle 12 as described above. After applying the magnetic force to the suction plate 4c of the closing member 1, it is possible to easily confirm whether the gas pipe 10 and the repair saddle 12 are hermetically sealed with the above-described soap water. .

  When an operation is performed to pull out the inner plug body 4 by applying a magnetic force to the suction plate 4c of the closing member 1, the inner plug body 4 cannot be pulled upward by a distance L for some reason, and the O-ring 5 has a step. Although it moved to the upper part of the part 3d, it may stop in the middle, or the inner side plug body 4 may fall below in the middle of pulling out upwards. However, in the present invention, when the blocking member 1 is inserted into the perforation hole 11, the through hole 3a provided in the diameter expanding member 3 is formed by the lower hole 3c and the lower hole 3c from the insertion direction. Since the upper hole 3b having an inner diameter larger than that of the hole 3c is provided on the upper side, the following effects can be exhibited with respect to these problems.

  When the above-described inner plug 4 stops halfway, the O-ring 5 has moved to above the stepped portion 3d, so the lower hole 3d and the upper hole having an inner diameter larger than this hole 3d. 3b communicates with each other, and therefore, the city gas flowing through the gas pipe 10 flows out into the space 13, which causes a problem in confirming whether the gas pipe 10 and the repair saddle 12 are fused properly. There is nothing.

  On the other hand, even when the inner plug 4 drops downward while being pulled out upward as described above, the O-ring 5 is locked to the stepped portion 3d as shown in FIG. Also in the state shown in FIG. 6, by setting the width of the step portion 3d in the radial direction of the through hole 3a to be sufficiently larger than the width of the O-ring 5, the lower hole portion 3d and the inner diameter larger than the hole portion 3d are provided. The upper hole 3b communicates with the upper hole 3b. As a result, there is no problem in confirming whether the gas pipe 10 and the repair saddle 12 are fused properly.

(Configuration of suction device for closing member)
Then, the structure of the adsorption | suction apparatus for obstruction | occlusion members which concerns on this invention is demonstrated. This adsorbing device for a closing member is placed (attached) on the upper surface portion of the outer protrusion 12 a of the repair saddle 12 and applies a magnetic force to the closing member 1 inserted into the perforated hole 11 perforated in the gas pipe 10. Thus, the device is used to move only the inner plug 4 from the closing member 1 to the F direction by a predetermined distance L as shown in FIG. 5 from the state shown in FIG.

  Hereinafter, the structure of the adsorbing device for the closing member will be described with reference to FIGS. 7 is a cross-sectional view showing the configuration of the closing member adsorption device 20, and shows an initial state in which an operation such as applying a magnetic force to the closing member 1 is not performed, and FIG. 8 is an initial state shown in FIG. A state when the operator performs an operation to apply a magnetic force to the closing member 1 is shown.

  As shown in FIG. 7, the closing member adsorption device 20 mainly includes a permanent magnet 21, a magnet base 22 that houses the permanent magnet 21, an operating rod 23, a yoke 24, and a spring 25. The magnet base 22 is made of a nonmagnetic material such as stainless steel, aluminum alloy, or copper alloy.

  The permanent magnet 21 has a predetermined thickness and has a circular shape or a quadrangular shape in plan view. As the permanent magnet 21, a rare earth magnet, particularly R (R is one or more of rare earth elements including Y (including Nd)), T (T is Fe or Fe and Co), and An R-T-B system anisotropic sintered magnet containing B (boron) as an essential component, and a rare earth magnet or a ferrite magnet subjected to a corrosion-resistant surface treatment (for example, a plating layer or a resin layer) is used. It is desirable. Further, the permanent magnet 21 has a magnetic pole N and a magnetic pole S formed at a pair of left and right ends of the paper surface shown in FIG.

The magnet base 22 has a recess 22a in which a recess for storing the permanent magnet 21 is formed in a lower portion thereof, and a recess in which a suction surface 22c is formed integrally connected to the lower end of the storage 22a. An adsorption portion 22b is provided. The storage portion 22a and the attracting portion 22b form a space portion K1 for allowing the permanent magnet 21 to move in the vertical direction.
A cylindrical or quadrangular space K2 is formed in the upper part of the magnet base 22. The operating rod 23 is integrally connected to the upper end portion of the vertically long shaft body 27 by a bolt 26 and the like, and the lower end of the shaft body 27 is integrally connected to the permanent magnet 21 by screw connection or the like.
In addition, the adsorption | suction part 22b and the shaft body 27 use the stainless steel which is a nonmagnetic material, an aluminum alloy, or a copper alloy.

  Between the lower end 23a of the operating rod 23 and the bottom of the space K2, a spring 25 having a moderate elastic force with a shaft body 27 fitted is inserted. Thereby, the operating rod 23 to which the shaft body 27 is integrally connected is disposed so as to be movable in the vertical direction in the space K2. 7, the operating rod 23 is pushed up to the top by the repulsive force of the spring 25, and the permanent magnet 21 is pushed up to the top of the space K <b> 1 accordingly, and the magnet base 22. The state which contact | abutted to the upper surface part of the storage part 22a of this is shown.

  In the initial state of the closing member adsorption device 20 shown in FIG. 7, the magnetic poles N and S provided on the pair of opposing side surfaces of the permanent magnet 21 are positioned beside the yoke 24. For this reason, the magnetic lines of force from the magnetic pole N to the magnetic pole S are short-circuited by the yoke 24, so that the magnetic lines of force that reach the direction other than the direction of the yoke 24 become extremely weak. Thereby, in FIG. 7 which shows the initial state which does not use the adsorption | suction apparatus 20 for closure members, the effect which can prevent that the permanent magnet 21 adsorb | sucks magnetic foreign materials, such as iron powder, also arises.

The yoke 24 is fixed so as to cover the outer peripheral surface of the storage portion 22a of the magnet base 22, has a donut shape or a polygonal shape having a predetermined thickness, and uses SPCC (cold rolled steel plate) or the like.
In addition, the above-described spring 25 serves as a biasing unit that gives an action of returning the permanent magnet 21 toward the initial position. Further, the magnet base 22, the storage portion 22a, the attracting portion 22b, the operating rod 23, the spring 25, the shaft body 27, and the like constitute a vertically moving moving means for moving the permanent magnet 21 from the initial position to the closing member 1 direction. .

As shown in FIG. 5 from the state shown in FIG. 4, when performing the operation of pulling out only the inner plug 4 from the closing member 1 inserted into the perforated hole 11 perforated in the gas pipe 10 using magnetic force, the following work is performed. Do.
(1) The closing member adsorbing device 20 shown in FIG. 7 is placed (mounted) on the upper surface of the outer protruding portion 12 a of the repair saddle 12. At this time, the closing member suction device 20 is placed on the upper surface of the outer protrusion 12 a of the repair saddle 12 so that the suction surface 22 c of the closing member suction device 20 is positioned above the closing member 1.

  (2) Subsequently, an operation of pushing down the operating rod 23 of the closing member suction device 20 by hand is performed. Then, the spring 25 is compressed in the direction of the outer protruding portion 12a of the repair saddle 12 by this pressing force, and the permanent magnet 21 descends in the space K1 and contacts the attracting surface 22c, as shown in FIG. It is positioned slightly above the abutting position. At this time, the permanent magnet 21 is positioned below the yoke 24.

  When the permanent magnet 21 is lowered to the state shown in FIG. 8, the magnetic pole N and the magnetic pole S formed on the side surface of the permanent magnet 21 are positioned below the yoke 24, so that the lines of magnetic force are below the permanent magnet 21. That is, the suction plate 4c of the closing member 1 is reached. Then, the permanent magnet 21 performs the action of pulling the suction plate 4c of the closing member 1 upward by a distance L by its magnetic force, so that the suction plate 4c is removed from the outer protrusion 12a of the repair saddle 12 as shown in FIG. Pull up until it contacts the side surface 12c. As a result, only the inner plug body 4 moves upward from the closing member 1 by a distance L, so that the through hole 3a constituted by the lower hole 3c and the upper hole 3b communicates with the inside of the gas pipe 10. become. Accordingly, since the city gas flowing in the gas pipe 10 flows into the space portion 13 while the operator performs the operation of pushing down the operation rod 23 by hand, the gas pipe 10 and the repair saddle 12 are in contact with each other. It becomes possible to reliably determine whether the airtightness with respect to the fusion is good or bad. When the operation for determining whether the airtightness is good or not is finished, the operator stops the operation of pushing down the operation rod 23. As a result, the repelling force of the spring 25 acts on the closing member suction device 20 and the initial state shown in FIG. 7 is obtained.

  In the present invention, means for confirming that the inner plug 4 has been pulled out from the closing member 1 by the operation of the closing member suction device 20 is also important. As this confirmation means, any of the following means can be adopted.

  (1) The sound generated when the suction plate 4c is pulled out by a magnetic force and comes into contact with the inner side surface 12c of the outer protrusion 12a of the repair saddle 12 is detected. This sound detection may be confirmed by an operator's ear, or a sound wave detection device using a high-performance microphone may be used.

  (2) A magnet device in which a permanent magnet, for example, a columnar magnet provided with the magnetic poles N and S opposed to each other by 180 ° on the outer peripheral surface is rotatably mounted on the upper surface portion of the outer protruding portion 12a of the repair saddle 12, The rotational resistance when the cylindrical magnet is rotated manually is detected by hand. If a change in rotational resistance is felt by this operation, it can be determined that the suction plate 4c has been pulled out.

  (3) The suction plate 4c that has been pulled out is detected by placing a metal detector on the side of the outer protrusion 12a of the repair saddle 12 or the like.

  In order to place the above-described suction member adsorbing device 20 on the upper surface of the outer protrusion 12a of the repair saddle 12 in a stable state, a floor plate made of a non-magnetic material such as synthetic resin is attached to the suction surface 22c. It is good to.

1: Closure member 2: Outer plug body 3: Diameter expanding member 3a: Through hole 3b: Upper hole portion 3c: Lower hole portion 3d: Stepped portion 4: Inner plug member 5: O-ring 10: Gas pipe 11: Perforation Hole 12: Repair saddle 13: Space part 20: Adsorption device for closing member 21: Permanent magnet 22: Magnet base 23: Operating rod 24: Yoke 25: Spring K1, K2: Space part

Claims (4)

A closing member for inserting into a perforated hole perforated in a synthetic resin tube and closing the perforated hole,
A diameter-enlarging member made of a non-magnetic material having a through hole formed in the insertion direction and mounting an outer plug made of a non-magnetic elastic member on the outer peripheral surface;
The through-hole formed in the diameter-expanding member follows the lower hole portion whose lower end is located inside the synthetic resin tube and the lower hole portion in a state where the blocking member is inserted into the perforated hole. An inner plug body made of a magnetic member that is movably disposed in the through hole with a seal member fitted thereto, and an upper hole portion having an inner diameter larger than the lower hole portion. Prepared,
When the seal member fitted to the inner plug is located in the lower hole, the communication between the lower hole and the upper hole is sealed by the seal member. A featured closure member.   The inner plug body includes a plug body portion inserted into the through-hole and fitting the seal member, and an adsorption plate made of a magnetic material coupled to one end of the plug body portion, The closing member according to claim 1, wherein the suction plate is disposed outside the through hole. An adsorbing device for a closing member for applying a magnetic force to the closing member according to any one of claims 1 to 2, wherein the closing member is inserted into a perforated hole perforated in a synthetic resin tube.
A permanent magnet having magnetic poles formed on a pair of opposing side surfaces;
Vertical movement moving means for moving the permanent magnet from the initial position toward the closing member;
A yoke disposed at a predetermined distance from the magnetic pole corresponding to the initial position of the permanent magnet;
An adsorbing device for an occluding member, comprising:   The said vertical movement moving means is equipped with the biasing means which provides the effect | action which returns the said permanent magnet to the said initial position direction, The adsorption | suction apparatus for obstruction | occlusion members of Claim 3 characterized by the above-mentioned.

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