JP5127326B2 - Stopper device in gas live pipe cutoff method - Google Patents

Description

  The present invention does not depressurize the supply of gas in a pipe line when performing a construction work such as replacing or turning a part of a pipe line in an existing medium-pressure pipe having a relatively large diameter. It is related with the stopper apparatus in the gas live pipe | tube cutoff construction method which can interrupt | block the gas in a pipe line in the state which continued supply of this.

  Conventionally, when performing communication work such as replacement or cutting of a part of a pipeline in a construction section of a gas pipe, as disclosed in Non-Patent Document 1, replacement or switching to a gas pipeline is performed. A no-blow construction method is well known in which a bypass route is provided to bypass the replacement location when connecting work such as, and the operation of turning the pipeline in the replacement location is performed without blowing while the gas is flowing through the pipeline. .

  Further, in the above-mentioned no-blowing method of the intermediate pressure gas pipe, as an apparatus for drilling a through-piercing larger than the outer diameter of the pipe with respect to a branching portion of the existing gas pipe to which the bypass passage is connected, for example, Patent Document 1, A well-known example disclosed in Patent Document 2 is well known.

  In addition, a stopper member for blocking the gas passage between the upstream side and the downstream side of the replacement location is provided on the upstream side of the replacement location when performing communication work such as replacement or turning of the medium pressure gas pipe. It was inserted into a pipe line between the pipe and the downstream side to block the pipe line, and a desired cutting work was performed on the pipe line in the blocked section.

  At this time, as disclosed in Patent Document 3, for example, the stopper member for blocking the gas in the pipe is wound around a rubber band to have a predetermined diameter and pressed against the pipe line, as shown in FIG. As described above, the dish-shaped self-sealing stopper member a is lowered by the stopper device b, and the stopper member a is brought into contact with the inner surface c of the main pipe to block the gas.

JP-A-10-274375 JP 2002-98287 A JP 2007-10113 A “Main Branch Guidelines (Construction)”, Japan Gas Association, September 1986, p. 301-311

  However, since the conventional stopper is pressed in the flow direction in the cross section of the pipe and not pressed against the inner wall of the gas pipe, a gap may be formed between the inner wall and the stopper, and the blocking is not necessarily complete. There was a thing.

  An object of the present invention is to provide a so-called gas live tube shut-off method in a state where a gas is allowed to flow by forming a bypass path such as a work section of the gas pipe in view of the problem when the stopper is installed in the conventional gas live pipe shut-off method. Another object of the present invention is to provide a stopper device that securely attaches a stopper member to the inner wall of a pipe line and blocks gas without generating a gap.

In order to solve the above-mentioned problem, the invention described in claim 1 is a stopper device used in a gas pipeline provided with a perforation for inserting a stopper member into a part of an existing pipeline, and the stopper device includes a stopper member and The stopper member is attached to one end, and the stopper member is capable of inserting the stopper member into the pipe line from the perforation , and the stopper member includes a base portion having one end fixed to the stopper insertion member. An advancing / retreating portion provided on the outer periphery of the base portion and slidable in the axial direction of the pipe line with respect to the base portion; a thick elastic ring member in contact with the inner wall of the pipe line; A fixed support part provided on the slide part and a slide support part provided slidably with respect to the advance / retreat part, and the fixed support part and the holding part for holding the thick elastic ring member by the slide support part; , Sliding push Comprising a mechanism, a該滑dynamic pushing mechanism in a state where the stopper member is inserted from the perforation, the forward and reverse part to reach a predetermined conduit inner wall, said slide support portion of the sandwiching portion, the meat It is a stopper device in a gas live pipe shut-off method characterized by moving a thick elastic ring member in a pressing direction.

The invention according to claim 2 is characterized in that the sliding pressing mechanism for moving the advancing / retreating portion and the slide support portion uses a hydraulic circuit, and the stopper device in the gas live pipe shut-off method according to claim 1 It is.

  According to the present invention, in the gas live pipe shut-off method in a state where a gas is flowed by forming a bypass path such as a construction section of the gas pipe, the thick elastic ring member is pressed from both sides, Swells in the outer circumferential direction, so that the inner wall of the existing pipe line is surely brought into contact with the pressure, so that the stopper member can be attached to the existing pipe line in a completely airtight state, and therefore the gas is blocked. The stopper member can be easily detached.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to examples.

  FIG. 1 illustrates an existing gas pipeline P that uses a stopper device in a gas live pipe cutoff method according to an embodiment of the present invention.

  In the existing gas pipeline P of medium-pressure steel pipe, for example, when there is a construction zone Z in which the gas pipe is removed or a part of the pipeline is replaced, as the previous stage, on the upstream side and the downstream side of the construction zone Z The perforations A and B connecting the bypass path C are respectively perforated and cut by a no-blow method, and the bypass path C is connected to the perforations A and B.

  In the vicinity of the perforations A and B, stopper members 5 are mounted on both sides so as not to release gas into the construction section Z. The work perforations D and E for mounting the stopper members 5 are also perforated A and B. In the same way as above, drilling and cutting is performed by the no-blow method, and the joint member G provided with the gate valve F is hermetically fixed to the existing gas pipeline P by welding means so as not to leak gas. Here, if the stopper device in the gas live pipe shut-off method of the present embodiment is attached to the gate valve F, the stopper device is operated and the stopper member 5 is attached to the inner wall of the main pipe path, the construction zone Z is surely reached. The release of gas is interrupted.

  The relationship among the existing gas pipe P, the joint member G, and the gate valve F in the no-blow method will be described with reference to FIG. First, the upper joint member G1 and the lower joint member G2 divided into two parts are put on the existing gas pipeline P from the vertical direction, and the contact point g1 between the upper joint member G1 and the existing gas pipeline P is tightly fixed by welding means, Similarly, the contact point g2 between the lower joint member G2 and the existing gas pipeline P is closely fixed by welding means, and further, all the joint portions in the left and right direction of the upper and lower joint members G1 and G2 are not leaked by the weld point g3. Tightly fix so that.

  The lower joint member G2 is provided with an opening G3 connected to the bypass path C, and the upper joint member G1 is provided with an opening G4. The opening G4 is inserted with a drilling work tool or a stopper device 1 of the present invention described later. The working opening G5 is welded at a welding location g4 in a sealed state, and a flange member G6 joined to the two-divided member is fixed to the working opening G5 in a sealed state.

  The flange member G6 is provided with a gate valve F. The gate valve F includes a frame F1, an opening F2, a gate F3, and an operation gripping part F4. In FIG. 2, the opening F2 is in an open state. When the work is not performed, the gate F3 is pushed to the left by the operation gripping part F4 to cover the opening F2 and prevent gas and the like from leaking outside.

  In this embodiment, the drilling holes A and B for connecting the bypass passage C and the work drilling holes D and E for mounting the stopper member 5 (see FIG. 5) have already been drilled and cut. Since the outer diameter of the stopper member is substantially the same as the inner diameter of the existing gas pipe P, the inner diameter of the drilling holes D and E to be drilled and cut must exceed the inner diameter of the existing gas pipe P. As shown in FIG. 5, the existing gas pipeline P is cut, but the existing gas pipeline P is not divided because the joint member G welds and holds the existing gas pipeline P.

  FIG. 3 shows the stopper insertion member 2 of the stopper device 1 in a state before being attached to the gate valve F. The storage portion 21 of the stopper member 5 is at the lower end, and the lower end surface 211 on the outer periphery of the storage portion 21 is the gate. A rubber O-ring 212 is provided so that the gate valve F can be tightly fixed to the upper end surface of the gate valve F closed by the shutter of the portion F3 (see FIG. 4). The protruding edge 22 is pressed downward and fixed (see FIG. 4).

  As shown in FIG. 4, the stopper device 1 is fixed to the gate valve F and opened by the shutter of the gate portion F3, and the stopper member 5 of the stopper device 1 is inserted into the working holes D and E.

  A support cylinder 24 that slides and supports the hydraulic pipe 26 and the support frame 27 is fixed on the ceiling 23 of the storage portion 21 of the stopper insertion member 2 of the stopper device 1 by a bolt 241. The support cylinder 24 is a pair of lower portions. A base portion 25a and an upper base portion 25b are provided, and two long hydraulic pipes 26 (26a, 26b) are supported to be slidable in the vertical direction, and a moving seal is provided at an intermediate position between the two hydraulic pipes 26. When the member 25c is fixed and the central screw rod 25d of the support cylinder 24 is rotated, the moving seal member 25 moves up and down, and accordingly, the entire two hydraulic pipes 26 move up and down.

  A support frame 27 is fixed to the lower side of the moving seal member 25, a stopper member 5 is attached to the lower end of the support frame 27, and the lower end of the hydraulic pipe 26 is connected to the pipe 511a of the stopper member 5 via the support frame 27, 512 (see FIG. 9) is connected to the hydraulic pressure introduction hole. Further, a long support frame 27 having a U-shaped cross section is also supported so as to be slidable in the vertical direction together with the hydraulic pipe 26, as shown in FIG.

  The support frame 27 is slidably supported by the pair of lower base portion 25a and upper base portion 25b so that the support frame 27 is always supported at both ends so that the long support frame 27 does not swing. Further, the support frame 27 of the stopper member 5 is supported so as not to wobble, but further, the flow direction of the pipe line of the support frame 27 so that the movable part of the stopper member 5 does not swing. A guide member 271 extends to guide the outer periphery of the sliding portion of the stopper member 5.

  The pair of hydraulic pipes 26 includes a stopper member insertion hydraulic pipe 26a and a stopper member detachment hydraulic pipe 26b. The pair of hydraulic pipes moves in the vertical direction together with the support frame 27. It is sealed so that gas does not leak even if it moves. In the work of mounting the stopper member 5 on the inner wall of the pipe line P, the support frame 27 must be lowered. However, the work of lowering the stopper member 5 (the work of lifting in the case of detachment) is manual work or a motor or the like as necessary. The stopper member 5 is lowered to the position shown in FIG.

  Thereafter, as shown in FIG. 6, the sliding pressing mechanism including the hydraulic pipe 26 a and the hydraulic pipe 26 b is operated, the stopper member 5 is inserted into the pipeline, and a predetermined stopper member is tightly fixed.

  Next, the work for fixing and fixing the stopper member 5 to the inner wall of the pipe P will be described in detail with reference to the cross-sectional views of FIGS.

  As shown in FIG. 7 (refer to FIG. 9 for details), the stopper member 5 is composed of a base portion 51 and an advancing / retreating portion 52. The base portion 51 is fixed to the support frame 27 by stopper member fixing bolts 272, and the base portion. 51 includes a pipe 511a and a large pipe 511b connected to the hydraulic pipe 26a, and a pipe 512 connected to the hydraulic pipe 26b.

  As shown in FIG. 8, the inner peripheral slide portion 521 having the rubber O-ring 522 of the advance / retreat portion 52 slides oppositely to the outer periphery portion 513 of the base portion 51, and moves relative to the inner wall portion 523 of the advance / retreat portion 52. Then, the outer peripheral slide portion 515 of the base portion 51 having the O-ring 514 slides oppositely, and the advance / retreat portion 52 moves forward (arrow in the figure).

  Then, as shown in FIG. 9, the outer peripheral slide portion 515 protruding at the end of the base portion 51 and the inner peripheral slide portion 521 protruding inward of the advance / retreat portion 52 come into pressure contact with each other, and the advance distance y of the advance / retreat portion 52 Is regulated. As described above, in the state of FIGS. 8 and 9, the cylinder space X <b> 1 to which hydraulic pressure is applied is formed inside the advance / retreat portion 52.

  The advancing / retreating portion 52 includes a cylinder portion 524 having an inner wall portion 523 and a front lid portion 525. The front lid portion 525 constitutes most of the shut-off valve, and the outer peripheral slide portion 515 of the base portion 51 is connected to the inner wall portion 523. Used when inserting and assembling inside.

Further, the outer periphery 524a of the cylinder portion 524 is provided with a sandwiching portion 6 for sandwiching a thick elastic ring member 7 such as urethane rubber having a thickness of about 3 to 6 cm.
The sandwiching portion 6 includes a fixed support portion 61 and a slide support portion 62. The fixed support portion 61 is L-shaped and forms a sufficient moving space X4 between the outer periphery of the inner cylinder portion 524. The fixed support portion 61 is fixedly provided with a fixing member 611 (of the fixed support portion 61) on the projection portion 526 provided on the support frame 27 side on the outer periphery of the cylinder portion 524, that is, the side to which the gas pressure is applied. One side of the thick elastic ring member 7 is supported by a clamping member 612. Then, when the stopper member 5 is closely fixed, the slide support 62 is moved in a direction (arrow in the figure) in which the other side surface of the thick elastic ring member (thick urethane rubber) 7 is pressed. When the thick elastic ring member 7 is strongly pressed by this member, the thick elastic ring member 7 bulges in the outer peripheral direction (in the direction of arrow Z in the figure) so as to come into contact with the inner wall of the existing gas pipeline P. Become.

  The structure of the movement of the slide support portion 62 will be described in detail. The slide support portion 62 mainly includes a slide member 621 and a clamping member 622. The inner periphery 621b of the slide member 621 slides on the outer periphery of the cylinder portion 524 and is meat. The sandwiching member 622 sandwiches one side surface 622a of the thick elastic ring member 7 so that the thick elastic ring member 7 is attached to the slide member 621. After fitting on the outer periphery, the clamping member 622 is fixed to the slide member 621 with the bolt 623 and assembled.

  Therefore, in the slide support portion 62, the slide member 621 slides liquid-tightly on the outer periphery of the cylinder portion 524 of the advance / retreat portion 52 via the O-ring, while the cylindrical inner wall 622 a of the holding member 622 and the cylindrical shape of the slide member 621. The cylindrical inner wall formed from the inner peripheral wall 624 is also configured to slide in a liquid-tight manner with respect to the cylindrical portion outer periphery 524a of the front cover 525 via an O-ring.

  A relatively narrow hydraulic oil introduction hole 63 is formed in the cylinder portion 524 so that hydraulic oil can be introduced between the side portion 621a of the slide member 621 connected to the clamping member 622 and the side end portion 525a (inner wall) of the front cover portion 525. Are provided between the outer periphery 524a, the front lid portion 525, and the side cylinder surface 525b, and between the side end portion 525a of the front lid portion 525 and the tip end portion 524b of the cylinder portion 524. The gap distance between the side portion 621a and the side end portion 525a is increased, and the movement space X2 is formed by the movement of the slide support portion 62.

Here, FIGS. 7 to 9 will be described mainly with respect to the hydraulic circuit. In FIG. 7, the advancing / retreating portion 52 is retracted, and the stopper member 5 is inserted into the opening of the work holes D and E at the beginning. is there. Next, in FIG. 8, when the hydraulic pressure is supplied from the hydraulic pipe 26a through the pipe 511a having the hydraulic introduction hole and the large pipe 511b, the cylinder space X1 to which the hydraulic pressure is applied is formed in the inner wall portion 523 of the advance / retreat portion 52. When the advancing / retreating portion 52 is gradually formed and the cylinder space X1 is increased and the advance distance y is regulated as shown in FIG. 9, the hydraulic pressure is relatively small. As the hydraulic pressure is supplied to and the moving space X2 is gradually formed larger, the outer peripheral surface of the thick elastic ring member (thick urethane rubber) 7 is flat Y1 (see FIG. 8). ) In the direction of pressing one side surface 622a, both side surfaces of the thick elastic ring member 7 are strongly pressed, and the thick elastic ring member 7 is expanded in the outer peripheral direction Y2 (FIG. 9). The gas is reliably shut off by contacting the inner wall of the existing gas pipeline P.
The reason why the slide support part 62 is set to the outside air side is that the outside air side has a lower pressure than the normal 7 atm on the pipe line side, so that the slide support part 62 moves smoothly in the forward and backward directions.

  Thus, the stopper members 5 are attached to both sides of the construction section Z so that the gas is not released into the construction section Z, and the stopper member 5 is detached when the construction in the construction section Z is completed. FIG. 10 shows the state.

  In FIG. 10, when the hydraulic pressure is removed from the hydraulic pipe 26a, the slide support portion 62 is pushed back to the original state by the elasticity of the thick elastic ring member 7 (arrow in the figure), and the thick elastic ring member 7 also has a flat outer periphery. Returning to the Y1 state, the cylinder (523) space X1 inside the advance / retreat part 52 is also at the same low pressure as the outside air, and usually the advance / retreat part 52 is also retracted and returns to the original state. The hydraulic pressure is supplied from the hydraulic pipe 26b to return to the original state of FIG. 7. For this purpose, the protruding end 515 of the base 51 and the forward / backward portion 52 are inward from the hydraulic pipe 26a via the pipe 512. Hydraulic oil is supplied to the place where the protruding inner slide part 521 is in pressure contact, forming a moving space X3, retreating the cylinder part 524, quickly bringing the stopper member 5 into the working hole D, From E The entire stopper device may be removed from the gate valve F, and the gate valve F may be closed.

According to this embodiment, in the gas live pipe shut-off method in a state where a gas flow is made by forming a bypass passage such as a construction section of a gas pipe, the thick elastic ring member is pressed in the outer circumferential direction by pressing the thick elastic ring member Therefore, the stopper member can be securely attached to the inner wall of the existing pipe line, the gas can be reliably shut off, and the stopper member can be removed. Separation is easy.
Needless to say, the present invention is not limited to the above-described embodiment unless the characteristics of the present invention are impaired.

It is a schematic explanatory drawing which uses a stopper apparatus in the gas live pipe | tube cutoff method by the Example of this invention. It is an expanded partial sectional view of the relationship between the existing gas pipeline P, the joint member G, and the gate valve F in the Example of this invention. It is sectional drawing before attaching the stopper insertion member of the stopper apparatus of the Example of this invention to a pipe line. It is sectional drawing after mounting the stopper apparatus shown in FIG. 3 to a pipe line. FIG. 5 is a cross-sectional plan view after the stopper device shown in FIG. 4 is mounted on a pipe line. FIG. 5 is a cross-sectional view showing a state in which the stopper device shown in FIG. 4 is mounted on a pipe line and the stopper member is inserted into the pipe inner wall. It is sectional drawing of the state before operation of the stopper member of the Example of this invention. It is sectional drawing of the state which the advance / retreat part advanced in the state shown in FIG. FIG. 9 is a cross-sectional view of a state in which the slide support portion moves and presses the thick elastic ring member in the clamping portion on the advance / retreat portion from the state shown in FIG. 8. FIG. 9 is a cross-sectional view of the state where the work is completed and the advancing / retreating part moves backward from the state illustrated in FIG. It is sectional drawing explaining a well-known stopper apparatus.

Explanation of symbols

A, B, D, E ... perforation, C ... bypass path,
F ... Gate valve, F1 ... Frame, F2 ... Opening, F3 ... Gate part,
F4: Operation gripping part,
G: Joint member, G1: Upper joint member, G2: Lower joint member,
G3, G4 ... opening, G5 ... work opening, G6 ... flange member,
g1 to g4 ... welding location, P ... existing gas pipeline, Z ... construction section,
X1 ... Cylinder space, X2, X3, X4 ... Movement space,
Y1 ... Ring member flat state, Y2 ... Ring member bulge state 1 ... Stopper device 2 ... Stopper insertion member, 21 ... Storage part, 211 ... Lower end surface, 212 ... O-ring,
22 ... bulging edge, 23 ... ceiling part, 24 ... support cylinder, 241 ... fixing bolt,
25a ... Lower base part, 25b ... Upper base part,
26, 26a, 26b ... hydraulic pipe, 27 ... support frame,
271 ... Guide member, 272 ... Stopper member fixing bolt,
3 ... Clamp, 31 ... Bolt,
5 ... stopper member,
51 ... Foundation part, 511a, 512 ... Piping, 511b ... Large piping,
513 ... outer peripheral part, 514 ... O-ring, 515 ... outer peripheral slide part,
52 ... Advance and retreat part, 521 ... Inner peripheral slide part, 522 ... O-ring, 523 ... Inner wall part,
524 ... Cylinder part, 524a ... Outer periphery, 524b ... Tip part,
525 ... Front cover part, 525a ... Side end part, 526 ... Projection part,
6 ... clamping part, 61 ... fixed support part, 611 ... fixing member, 612 ... clamping member,
62 ... slide support part, 621 ... slide member, 621a ... side part, 622 ... clamping member,
623 ... bolt, 624 ... cylindrical inner peripheral wall, 63 ... introduction hole 7 ... thick elastic ring member

Claims (2)

A stopper device used for a gas pipe provided with a perforation for inserting a stopper member into a part of an existing pipe,
The stopper device and the stopper member, the stopper member is attached to one end, and insertable stopper insertion member into conduit said stopper member from said perforations, made,
The stopper member is
A base portion having one end fixed to the stopper insertion member;
An advancing / retreating portion provided on an outer periphery of the base portion and provided so as to be slidable in an axial direction of a pipe line with respect to the base portion;
A thick elastic ring member in contact with the inner wall of the pipe line;
A fixed support portion provided on an outer periphery of the advance / retreat portion; and a slide support portion provided slidably with respect to the advance / retreat portion, wherein the fixed support portion and the slide support portion include the thick elastic ring member. A clamping part for clamping;
A sliding pressing mechanism;
With
該滑dynamic pushing mechanism in a state where the stopper member is inserted from the perforation, the forward and reverse part to reach a predetermined conduit inner wall, said slide support portion of the sandwiching portion, presses the thick elastic ring member A stopper device in a gas live tube shut-off method, wherein the stopper device is moved in the direction in which it is moved. The stopper device in the gas live pipe shut-off method according to claim 1, wherein a hydraulic circuit is used as the sliding pressing mechanism for moving the advance / retreat portion and the slide support portion .

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