JPH01229193A - Pipe fitting - Google Patents

Abstract

PURPOSE:To eliminate the need of flanging the end portions of connecting pipes at the time of recovering a pipeline by disposing expanding means extending between a flange of the first cylinder and a flange of the second cylinder in such a manner as to bring pipe receiving ports of the outer end portions of both cylinders into contact with the end surfaces of the connecting pipes. CONSTITUTION:A pipe fitting K includes a sleeve 1 as the first cylinder having a flange 11 on the outer peripheral portion, an outer cylinder as the second cylinder, which is fitted to the sleeve 1 in such a manner as to freely expand and contract and provided with a flange 21 on the outer peripheral portion thereof, and expanding means 3 which are disposed extending between the flange 11 of the sleeve 1 and the flange 21 of the outer cylinder 2 and fixed to both flanges 11, 12 in such a manner as to be released. After corroded portions of connecting pipes 4, 4 are cut and removed, the pipe fitting K reduced in pipe length is disposed at the cutting portions of the connecting pipes and the expanding means 3 are operated in the direction of separating the flange 11 and the flange 21 from each other.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pipe joint whose length can be expanded and contracted, and more specifically, after cutting a part of an existing pipe line, the pipe joint can be easily attached to the cut point. Regarding pipe fittings that can be installed.

(Prior Art) When the inner surface of an existing pipe is corroded, it is necessary to cut the corroded part of the pipe and replace the cough pipe with a new one. In order to repair a cut portion of a pipe line with good sealing performance, for example, a pipe joint having the structure shown below has been conventionally used.

■The pipe joint disclosed in Japanese Utility Model Application Publication No. 59-123784 includes a sleeve with a flange on the outer periphery, and an outer cylinder that is extendably fitted onto the sleeve and has a flange on the outer periphery. The length of the pipe joint can be changed by changing the overlapping dimension of the sleeve and outer cylinder. The pipe joint constructed in this way is placed at the cut point of the pipe, connects the flange provided at the connection end of one pipe to the flange of the sleeve, and connects the pipe on the other side. Both pipes are connected by connecting the flange provided at the side end and the flange of the outer cylinder.

■The pipe joint disclosed in Japanese Utility Model Publication No. 56-23788 consists of a sleeve with a flange on the outer periphery, and an outer tube that is extendably fitted onto the sleeve and has a flange on the outer periphery. , a holding ring slidably fitted onto the sleeve and the outer cylinder, and an extension disposed between both holding rings and the flange of the sleeve and releasably fixed to both holding rings and the flange. It has the following ingredients. By changing the fixing position of the extension tool, the overlapping dimension of the sleeve and the outer cylinder can be changed to change the overall length of the pipe joint.

A pipe joint with such a configuration, like the above-mentioned pipe joint,
A flange arranged at the cut point of the pipe line and connecting the flange provided at the connection side end of one pipe line and the flange of the sleeve, and a flange provided at the connection side end of the other pipe line and the outer cylinder. Both pipelines are connected by connecting the flanges of the pipe.

(Problems to be Solved by the Invention) In each of the conventional pipe joints described above, the flange provided on the sleeve and the outer cylinder is fixed to the flange provided on the connection side end of the pipe. It is necessary to provide a flange at the end, which has the following disadvantages.

(2) When a flange is provided at the end of a pipe by welding, if the pipe is made of a metal composite pipe whose inner surface is coated with resin, the inner resin layer will burn out at the temperature during welding.

■It is also possible to provide flanges at the ends of pipes by thread cutting, but the pipes are generally installed in narrow spaces. Thread cutting work in narrow spaces is extremely difficult, and workability on site is poor.

The present invention solves the above-mentioned drawbacks, and its purpose is to:
After cutting the repair point of an existing pipeline fixed to a structure, etc., when repairing the cut pipeline, there is no need to flange the connecting pipe ends, and the ends of both pipelines can be easily connected. The purpose is to provide pipe fittings that can be connected.

(Means for Solving the Problems) The pipe joint of the present invention has a first pipe joint provided with a flange on the outer periphery.
A cylindrical body, a second cylindrical body that is extendably connected to the first cylindrical body and has a flange on its outer periphery, and a flange that extends between the flange of the first cylindrical body and the flange of the second cylindrical body. and an extension tool that can releasably fix the pipe sockets formed at the outer ends of both the cylindrical bodies to both flanges in pressure contact with the end surfaces of the connecting pipes. This achieves the above objective.

(Function) After cutting and removing the corroded portion of the connecting pipe constituting the pipeline, a pipe joint with a shortened pipe length is placed at the cut point of the connecting pipe, and the flange of the first cylindrical body and the second cylindrical body are connected. Operate the extension tool in the direction that increases the distance between it and the flange. Then, the tube sockets of the first cylinder and the second cylinder come into pressure contact with the end surface of the connecting pipe disposed on the outside, and the outside end of the pipe joint and the connecting pipe end are sealed. In this state, the extension tool is fixed to each flange of both cylinders.

(Example) Examples of the present invention will be described in detail below.

As shown in FIGS. 1 and 2, the pipe joint includes a sleeve 1 as a first cylindrical body provided with a flange 11 on the outer periphery.
and an outer cylinder 2 as a second cylinder, which is telescopically fitted onto the sleeve 1 and has a flange 21 on its outer periphery.
Flange 11 of the sleeve 1 and flange 21 of the outer cylinder 2
and an extension member 3 disposed between the two flanges 11.21 and releasably fixed to both flanges 11.21.

The sleeve 1 is formed by providing a resin layer 1b on the inner surface of a steel pipe 1a. The sleeve 1 is formed by providing a large diameter part 13 having a slightly larger diameter than the insertion part 12 at the outer end of the insertion part 12 inserted into the outer cylinder 2. As shown in FIG. 3, a tube socket 18 having an inner diameter approximately equal to the outer diameter of the insertion portion 12 is provided on the inner peripheral side of the large diameter portion 13. The tube socket 18 has a socket surface 18a against which the end surface of the connecting pipe 4 can come into contact, and this socket surface 18a is provided with an annular projection 18b having a semicircular cross section. Above large diameter part 1
A flange 11 is provided on the outer periphery of the second
As shown in the figure, this flange 11 is provided with four through holes 14, 14, . . . at equal intervals in the circumferential direction. As shown in FIG. 4, a resin layer 1b extends from the distal end of the insertion portion 12 so as to cover the distal end surface of the steel pipe 1a.
An annular sliding portion 15 is formed here. Sliding part 15
The outer circumferential surface of the sliding portion 15 is somewhat realistic, and the outer circumferential surface of the sliding portion 15 protrudes slightly outward from the outer circumferential surface of the steel pipe 1a.

Further, a groove 16 is provided on the outer periphery of the insertion portion 12 at the distal end position of the insertion portion 12, and a water-stopping annular backing 17 is mounted within the groove 16. This annular backing 17 may have a curved outer circumference as shown in FIGS. Sealing properties are maintained by contacting them.

The curvature of the curved portion 17a of the annular packing 17 is shown in FIG.
a) Various changes can be made as shown in (b).

1st. As shown in FIGS. 4 and 5, the outer cylinder 2 is formed by providing a resin layer 2b on the inner surface of a steel pipe 2a. The outer cylinder 2 has a flange 21 protruding outwardly on the outer periphery of one end (on the sleeve 1 side) of the outer cylinder part 22 into which the insertion part 12 of the sleeve 1 is inserted, and a A connecting portion 23 is provided at the side end. Flange 2
1 is provided with four through holes 24 at equal intervals in the circumferential direction at positions corresponding to the through holes 14 of the flange 11.

The connecting portion 23 is provided with a thick wall portion 25 made of resin and a tube socket 28 into which the end of the connecting tube 4 is inserted.

A taper 25a is formed on the inner surface of the thick wall portion 25 so as not to cause flow resistance to the liquid sent from the sleeve 1 side, and a taper 25a is formed within the thick wall portion 25 to increase the strength of the thick wall portion 25. A metal annular protrusion 2c is embedded therein. The pipe socket 28 is an inner cylindrical part 2 extending concentrically with the steel pipe 2a from the thick wall part 25 toward the end of the steel pipe 2a.
6 and the end of the steel pipe 2a.

A socket 28a is formed on the inner surface of the tube socket 28, and an annular projection 28b having a semicircular cross section is provided on the socket surface 28a.

A long screw 30, which is a component of the extension tool 3, is inserted between a through hole 14 formed in the flange 11 of the sleeve 1 and a through hole 24 formed in the flange 21 of the outer cylinder 2. As shown in FIG. 1, nuts 30a, 30h, 30c, and 30d are screwed into the long screws 30 on both sides of the flange 11 of the sleeve l and the flange 21 of the outer cylinder 2, and the screws of each nut 30a to 30d are screwed together. By changing the alignment position, the distance between both flanges 11.21 can be changed, and the pair of nuts 30a and 30b or 30c and 3 can be changed.
06 to each flange 11.21 side, a pair of nuts 30a and 30b, or 30c and 30
Hold the flanges 11 and 21 with c, respectively, and tighten the long screws 30.
can be fixed to each flange 11.21. For example, the upper part of the long screw 30 can be fixed to the flange 11 by screwing a pair of nuts 30a and 30b provided on the flange 11 side of the sleeve 1 to the long screw 30, as shown in FIG. At the same time, by positioning the nut 30c on the sleeve 1 side of the pair of nuts 30c and 30d disposed on the flange 21 side of the outer cylinder 2 toward the sleeve 1 side as shown by the two-dot chain line in FIG. Since the length 30 can be inserted through the through hole 24 of the flange 21, the sleeve 1 and the outer tube 2 can be expanded and contracted by hand within the range of the distance between the nuts 30c and 30d. Next, the pipe joint K constructed in this way is
The operation for connecting the cut pipe ends will be explained.

The connecting pipe 4 constituting the pipe line is formed by providing a synthetic resin layer 4b on the inner surface of a steel pipe 4a. [71] As shown in FIG. 7(a), the corroded portion 40 of the connecting pipe 4 is cut off, and the annular backing 7 is attached to the end of the connecting pipe 4. As shown in FIGS. 3 and 5, the annular backing 7 has a flange 7b on the inner surface of one end of the cylinder 7a, and a flange 7C on the outer surface of the other ◇:1.1 side of the cylinder 7a. It is formed by providing This annular backing 7
The one flange portion 7b is positioned on the end surface of the connecting tube 4, the cylinder body 7a is placed on the outer periphery of the connecting tube 4, and the other flange portion 7C is placed outward from the outer peripheral surface of the connecting tube 4. It is attached to the tip of the connecting tube 4 so as to protrude. Then, as shown in FIG. 7(b), between the two connecting pipes 4.4 in this state, a new connecting pipe 4 (41) is inserted.
A pair of pipe joints K with shortened pipe lengths are arranged. In order to arrange the pipe joint K between the two connecting pipes 4.4, it is preferable to arrange the pipe joint so that the sleeve 1 side of the pipe joint is located on the upper side in the downward direction of the liquid flowing inside the connecting pipe 4.

Next, extend the pipe joint K and connect this pipe joint K to the connecting pipe 4.4.
To fix it between the two, it can be done as follows. That is, as shown in FIG. 1, the nut 30c disposed on the flange 21 side of the outer cylinder 2 is positioned on the flange 11 side of the sleeve 1, and the nut 30d is attached to the long screw 30.
The sleeve 1 is placed on the lower end side of the outer cylinder 2.
Insert the pipe into the pipe by hand and leave the pipe length at the pipe joint short. In this state, the long screw 30 is attached to the outer cylinder 2 side flange 2.
1, both nuts 3 can be inserted into the through hole 24 of
The length of the pipe joint can be freely expanded or contracted by hand within the interval dimensions of oc and 30d. Then the sleeve l
by hand from the outer cylinder 2, extend the pipe joint K, insert the end of the upper connecting pipe 4 into the pipe socket 18 of the sleeve 1, and insert it into the pipe socket 28 of the outer cylinder 2. Insert the end of the lower connecting tube 4. Next, the nut 30c is rotated to unscrew the flange 2.
Press it against the inner surface of 1.

By this operation, both flanges 11.21 move away from each other, and both pipe sockets 18.28 of the pipe joint are brought into pressure contact with the end faces of each connecting pipe 4.4 via backing 7.7. Can be done. Socket surface 18a of each tube socket 18.28
, 28a are provided with annular protrusions L8b and 28b, respectively, so that the annular protrusions 18b and 28+1 bite into the backings 7.7, respectively, thereby creating a seal between the connecting pipes 4.4 and the pipe joint. Improved. Further, since a metal annular protrusion 2c is embedded in the thick wall portion 25 of the tube socket 28 provided in the outer cylinder 2, the supporting strength of the tube socket 28 can be increased by this annular protrusion 2c. There is no fear that the pipe socket 28 will be damaged by the pressure force between the connecting pipe 4 and the pipe joint. In addition, when screwing the nuts 30c together and changing the screwing position, adjust the nuts 30c of each of the four long screws 30 so that the nuts 30c screwed on each of the four long screws 30 move approximately the same distance. It is preferable to move them sequentially.

Both connecting pipes 4.4 constituting the conduit are fixed to a structure 9 such as a floor or wall, and both connecting pipes 4.4 will not move outward due to pressure from the pipe socket 18.28. The pipe socket 18.28 and the end face of the connecting pipe 4.4 are reliably sealed, and as shown in FIGS. 1 and 7(b), there is a Fixed.

According to the above configuration, when cutting the corroded part of the pipe line and attaching the pipe joint K to the cut point of the cough pipe line, there is no need to provide a flange at the end of the connecting pipe 4 constituting the pipe line. Pipelines can be repaired. Therefore, even if the connecting pipe 4 is made of a steel pipe with an inner surface coated with resin as in the above embodiment,
The resin layer 4b on the inner surface is not damaged. Further, since there is no need for thread cutting work to provide a flange at the end of the connecting pipe 4, defective pipe lines can be easily repaired even in a narrow space.

Furthermore, since the annular backing 17 is elastically interposed between the outer surface of the insertion portion 12 of the sleeve 1 and the inner surface of the outer tube portion 22 of the outer tube 2, even if the pipe joint K is expanded or contracted, the sleeve 1 It is possible to maintain sealing performance with the outer cylinder 2, and there is no risk of water leaking from this sliding portion. Furthermore, since the backing 7 that covers the end surface of the connecting tube 4 is attached to the connecting end of the connecting tube 4, it is possible to prevent the water inside the pipe fitting from flowing to the end surface and outer surface of the connecting tube 4. There is no risk of corrosion of the steel pipe 4a portion to the connecting pipe. Furthermore, since the annular sliding part 15 provided at the tip of the sleeve 1 is in sliding contact with the inner surface of the inner resin layer 2b of the outer cylinder 2, by bringing these resin surfaces into sliding contact with each other, the insertion part 12 of the sleeve 1 is The outer circumferential surface is prevented from strongly rubbing against the inner circumferential surface of the outer tube part 22 of the outer tube 2, and the sleeve 1 and the outer tube 2 can be moved relatively easily.

In addition, as shown in FIG. 8, the resin layer 1 on the inner surface of the sleeve 1
The sliding portion 15 may be formed by extending b to the distal end surface of the steel pipe 1a and the outer peripheral surface of the steel pipe 1a. In other words, the recessed step 19 is formed on the outer peripheral surface of the tip of the steel pipe 1a of the sleeve 1.
is provided over the entire circumference, and a resin layer 1b is placed at the tip of this recessed step 19 to form a sliding portion 15. A water-stopping annular backing 17 is attached to the other portion 19a of the four-step portion 19. In this way, the tip of the steel pipe 1a can be completely covered with the resin, and the rust-preventing effect of the resin layer 1b on the steel pipe 1a can be enhanced. Also,
By supporting the sliding part 15 from the inside with the steel pipe 1a,
The pressure resistance of this sliding part 15 can be increased, and the outer cylinder 2
It is also possible to prevent the sliding portion 15 from peeling off from the steel pipe 1a due to the pressure from the steel pipe 1a.

Further, as shown in FIG. 9, a pipe socket 28 may be formed between the outer end surface of the thick walled portion 25 of the outer cylinder 2 and the steel pipe 2a.

A receiving surface 28a is formed on the inner surface of the tube socket 28, and an annular projection 28b is provided on this receiving surface 28a. Further, a groove 27 is provided on the inner surface of the protruding end of the steel pipe 2a, and an O-ring 29 is mounted within the groove 27.

In this embodiment as well, when extending the pipe length of the pipe joint, the receiving surface 28a of the tube socket 28 presses against the end surface of the connecting pipe 4, so that one flange portion 7b of the backing 7 is pressed against the receiving surface 28a of the pipe socket 28. '' is compressed between the surface 28a and the end surface of the connecting tube 4, and here the connection tube 4 and the tube socket 28 of the outer cylinder 2 are well sealed. Furthermore, when the receiving surface 28a of the tube socket 28 moves toward the end surface of the connecting tube 4, the annular protrusion 28b bites into one flange portion 7b of the backing 7, thereby further improving the sealing performance. The sealing performance is also improved by the O-ring 29 biting into the cylindrical body 7a of the banking 7.

In the above embodiment, the extension tool 3 is composed of a long screw 30 and four nuts 1 to 30a to 30d, but the lean l can also be made by using only two nuts 30b and 30c. The extension tool 3 is composed of a long bolt 1-, a plurality of nuts that are screwed into threaded parts formed at the tip of the long bolt, and a retaining pin that is removably attached to the base of the long bolt 1-. You may do so.

In this case, for example, with the head of the long bolt placed on the outer surface side of the flange of the sleeve, the threaded part of the long hole I is inserted into the through hole of the flange of the outer cylinder, and both sides of the flange of the outer cylinder are By screwing the nuts into the threaded portions of the long bolts, the flange is held between the two laminates, and the retaining pin is pulled out from the long bolt. In this state, the base of the long bolt can be inserted into the through hole of the flange of the sleeve, so you can manually adjust the insertion dimensions of the sleeve into the outer cylinder.
:I rll. Then, after stretching the pipe joint to the specified length by hand and placing the pipe joint at the cut point of both connecting pipes, attach the retaining pin to the long port, and then unscrew the nut.) -or ■Qporl-
The pipe joint may be extended by rotating.

In that case, the NAND may be fitted into the flange, and a threaded groove may be formed on the inner surface of the through hole of the flange. Furthermore, a nut is welded to each flange of the sleeve and outer cylinder, or a thread groove is carved on the inner surface of the through hole of each flange,
Long bolts with threaded portions provided at one end and the other end having opposite thread directions may be threaded into each of the nuts I or the flanges.

(Effects of the Invention) As described above, the pipe joint of the present invention can connect the cut pipe easily and with good sealing properties after cutting the corroded parts of the existing pipe. Defective parts can be easily updated. In particular, even if the pipeline is made of synthetic resin-coated steel pipe, there is no need to provide a flange at the end of the pipeline by welding, so it can be easily used to adjust the length of the synthetic resin-coated steel pipe or as a repair joint. It can be used effectively. In addition, since there is no need to provide a flange at the end of the pipe by thread cutting, the pipe joint can be installed even in a narrow space, and it is also easy to install on-site.

↓-L+-Speech of Drama Figure 1 is a sectional view showing a state in which a pipe joint according to an embodiment of the present invention is attached to a conduit, and Figure 2 is a sectional view taken along the line 11-■ in Figure 1. ,
Fig. 3 is an enlarged sectional view of part A in Fig. 1, Fig. 4 is an enlarged sectional view of part B in Fig. 1, Fig. 5 is an enlarged sectional view of part C in Fig. 1, and Fig. 6 (a ), (t)) are respectively cross-sectional views of the annular backing for water-stopping, FIGS. 7(a) and (b) are respectively explanatory views of the operation of the pipe joint, and FIG. 8 is the main part of another embodiment of the pipe joint. Sectional view No. 9 No. 1 is a sectional view of a main part of still another embodiment of the pipe joint.

■...First cylindrical body, 2...Second cylindrical body, 3...Extension tool, 4...Connecting pipe, 11...Flange, 18...Pipe socket, 21...Flange , 28...Pipe socket.

that's all

Claims (1)

[Claims] 1. A first cylindrical body provided with a flange on the outer periphery;
The second cylinder is extendably connected to the cylinder and is provided with a flange on the outer periphery, and is disposed between the flange of the first cylinder and the flange of the second cylinder, A pipe joint comprising: an extension tool capable of releasably fixing pipe sockets formed at the outer ends of both cylindrical bodies to both flanges in a state in which they are in pressure contact with the end faces of the connecting pipes.