JP5491876B2 - Socket welding jig - Google Patents

Description

  The present invention relates to a jig that improves the installation accuracy of socket welding that is often used for small-diameter piping.

  Socket welding is often used to connect small-diameter pipes. When socket welding is performed, especially in places where there are many places where it is difficult to work in a narrow space, and socket welding is performed during pipe repair work that needs to be performed in accordance with existing sockets, to the socket of the pipe If the insertion length of the socket is too long or too short, the distance from the innermost surface of the socket specified by socket welding to the end face of the inserted pipe, i.e., the removal allowance cannot be accurately observed, or the pipe There was a problem in installation accuracy that the mating part was bent or bent.

  When cutting the existing pipe and connecting the new pipe, insert the new pipe as far as it will hit the innermost part of the socket, and in that state, insert the first marking line on the pipe side along the socket inlet end. Once the pipe is pulled out, insert a new second marking line in the position just before the first marking line, and when connecting, connect the piping to the second marking line in the socket. After the insertion and temporary attachment, the main welding is performed.

  At that time, especially in a narrow space where it is difficult to work, the first marking line is difficult to put in correctly, and the line is often doubled or unclear and indistinguishable. Also, if the end of the pipe to be inserted is not cut at right angles to the pipe axis, the pipe axis does not match the socket axis when inserted into the socket, and the scribing position depends on how the pipe is inserted. The second marking line may not be parallel to the socket inlet end when the pipe is reinserted into the socket for temporary attachment. These are the reasons why it is not possible to accurately follow the removal allowance. Moreover, it also causes the pipe fitting part to bend or break.

  Patent Literature 1 and Patent Literature 2 describe a jig for accurately placing a marking line on a pipe. These are used when pipes with a relatively large diameter are carefully inserted in accordance with the drawings in a maintained factory, and each socket is fitted to match the existing socket at the pipe repair site. At the same time, it is not suitable for scribing many small-diameter pipes. The configuration and operation are relatively complicated, and the burden on the worker is large when used at the work site.

  Patent Literature 3 and Patent Literature 4 describe marking gauges and marking scales for marking. All of them have a simple structure, but these are used to help insert marking lines according to the drawing. Many small-diameter pipes are fitted to each socket so that they fit into existing sockets at the site of piping repair work. On the other hand, if the worker is injured while adjusting to different display points for each size of the pipe according to the display on the gauge, work mistakes are likely to occur.

JP 2004-90116 A JP 2003-71750 A JP 2009-243613 A JP 2001-289354 A

  The problem to be solved by the present invention is that, when socket welding is performed, especially in the case of socket welding performed in pipe repair work where there are many places where it is difficult to work in a narrow space, it is possible to reduce the removal allowance without making a work mistake. A simple jig that can be easily protected and marked easily, and a simple jig that can easily confirm that the end of the pipe inserted into the socket is perpendicular to the pipe axis, It is to provide a socket welding method using them.

Accordingly, the present invention provides a disk having a diameter substantially equal to the outer diameter of the pipe to be socket-welded, a thickness equal to the removal allowance, and a first jig comprising a handle attached to a substantially central portion of the disk. A first cylindrical body having an inner diameter substantially equal to the outer diameter of the pipe, the end surface of the first cylindrical body being perpendicular to the axial direction of the cylindrical body, the first cylindrical body A socket welding jig comprising a first jig and a second jig having a function of fixing the pipe to each other at an arbitrary place when the pipe is inserted into the body .

  When socket welding is performed, it is specified that the allowance is 2.5 mm, for example. The first jig is mainly a disk having a thickness equal to the removal allowance. The diameter of the disk is approximately equal to the outer diameter of the pipe to be socket welded.

  After this disk is applied to the innermost part of the socket before the pipe is inserted, the pipe is inserted. Since the disc has a thickness equal to the allowance, the inserted pipe stays in front of the socket from the innermost part of the socket.

  The diameter of the disk is such that it can be smoothly inserted into the socket, that is, a diameter substantially equal to the outer diameter of the pipe inserted into the socket, that is, the same as or slightly smaller than the outer diameter. If the diameter of the disk is too small, when the pipe is inserted, the disk or part of the disk may enter the pipe, and as a result, the inserted pipe may not stop exactly before it is removed. A nearly equal diameter is necessary.

  The handle is used when the first jig is put in and out of the socket. It can be as simple as a rod attached to the center of the disk at a right angle, and it can be inserted securely into the innermost part of the socket, and it has a shape and length that can be easily pinched by hand when pulling out the disk. Things are good. The reason why the handle is attached to the substantially central portion of the disk is that the handle does not get in the way when the pipe is inserted after the first jig is inserted into the socket.

  The main body of the second jig is a cylindrical body having an inner diameter substantially equal to the outer diameter of the pipe to be socket welded. Hereinafter, this is referred to as a first cylindrical body. Here, the inner diameter substantially equal to the outer diameter of the pipe means that the pipe can be smoothly inserted and slid into the cylindrical body, and the axial direction of the both cannot be changed. .

  After inserting the first jig into the socket, the pipe is inserted into the first socket, and it is confirmed that the tip of the pipe has hit the innermost part of the socket. Thereafter, the first cylindrical body is slid along the pipe so as to be aligned with the inlet end of the socket. The first cylindrical body is formed at a right angle to the axial direction of the cylindrical body so that the end surface thereof fits the inlet end of the socket.

  Since the first cylindrical body has a function of fixing the two to each other at an arbitrary position when the pipe is inserted therein, for example, the first cylindrical body has a set screw, the first cylindrical body is at the inlet end of the socket. The pipe and the first cylindrical body are fixed using the function in the state of being tight. With the first cylindrical body fixed, the piping is pulled out from the socket, and a marking line is inserted on the piping side along the socket-side end surface of the fixed first cylindrical body. This is a marking line corresponding to the above-mentioned second marking line. It is desirable to chamfer the end face of the cylindrical body at an angle of about 45 ° so that it can be easily marked.

  The first jig and the second jig are made according to the type of the outer diameter of the pipe used at the work site and distributed to the workers. The worker selects the first jig and the second jig that match the diameter of the pipe to be socket-welded and performs the work. Since the work is very clear as described above, when performing socket welding, especially in the case of socket welding performed in pipe repair work where there are many places where it is difficult to work in a narrow space, it is possible to remove without making an error. It is easy to be injured while keeping the bill exactly.

  Since the second jig is fixed to the pipe, the pipe can be pulled out from the socket, and scribing can be performed in a wide, easy-to-work place. If you try to scribble in a confined place with the pipe inserted in the socket, you can only enter the marking line within the reach of your hand or the range that can be visually confirmed, but if you use the second jig, Clear marking lines can be put in the entire circumference.

  In addition to the first jig and the second jig described in claim 1, the present invention provides a second cylindrical body made of a transparent material having an inner diameter substantially equal to the outer diameter of the pipe. A socket welding jig comprising a third jig having an end surface perpendicular to the axial direction of the second cylindrical body on one end surface thereof.

  When the pipe to be inserted into the socket is cut with a band saw or the like at the work site, the cut surface often does not become perpendicular to the tube axis. Inserting it into the socket as it is and inserting the first marking line makes it oblique to the tube axis. When the cable is inserted and reinserted, the marking line does not become parallel to the socket inlet end, or the pipe fitting portion is bent or broken by temporary welding according to the diagonal marking line.

  The third jig is made of a transparent material having an inner diameter substantially equal to the outer diameter of the pipe to be inserted into the socket and having an end face perpendicular to the axial direction of the cylindrical body at one end thereof, for example, acrylic resin. A cylindrical body. Hereinafter, this is referred to as a second cylindrical body. Here, the inner diameter substantially equal to the outer diameter of the pipe has the same meaning as described for the first cylindrical body.

  A third jig is made according to the type of outer diameter of the pipe used at the work site, and distributed to the workers. The worker cuts the pipe to be inserted into the socket, then selects a third jig suitable for the diameter of the pipe, and applies it to the cut end of the pipe.

  Since the third jig is made of a transparent material, it can be easily visually confirmed whether or not the entire circumference of the pipe end of the pipe is in close contact with the end face thereof. If they are in close contact with the entire circumference, the end of the pipe is cut at right angles to the pipe axis, and the perpendicularity of the pipe end can be easily confirmed.

  By checking that the end of the pipe is cut at right angles to the pipe axis, the axis of the pipe does not match the axis of the socket when inserted into the socket. The position changes, and when the pipe is re-inserted into the socket for temporary attachment, the second marking line does not become parallel to the socket inlet end, and the removal allowance cannot be accurately maintained. The cause of bending or breaking can be removed beforehand.

  All of these jigs described above have a simple configuration, and can be easily produced at the work site as necessary.

  Furthermore, the present invention is a method for socket welding a pipe using the socket welding jig according to claim 1 or 2.

  By using this method, the socket allowance can be accurately observed without making a mistake when socket welding is performed, especially when socket welding is performed in pipe repair work where there are many places that are difficult to work with. Since it can be easily marked, and it can be easily confirmed that the end of the pipe inserted into the socket is cut at right angles to the pipe axis, the accuracy of socket welding installation can be greatly improved.

  By adopting the socket welding jig of the present invention, when performing socket welding, especially in the case of socket welding performed in pipe repair work where there are many places that are narrow and difficult to work with, there is no work mistake. Since it is easy to injure by accurately keeping the removal allowance, and it is easy to confirm that the end of the pipe inserted into the socket is perpendicular to the pipe axis, so that socket welding can be installed. The accuracy can be greatly improved. Each jig has a simple structure, so it can be easily made as needed at the work site. In addition, the operation is simple and the burden on the worker can be reduced.

It is the front view and side view of Example 1 of the 1st jig | tool of this invention. It is the front view and side view of Example 2 of the 2nd jig | tool of this invention. It is the front view and side view of Example 3 of the 3rd jig | tool of this invention. It is explanatory drawing which shows the usage method of the 1st jig | tool of this invention. It is explanatory drawing which shows the usage method of the 2nd jig | tool of this invention. It is explanatory drawing which shows the usage method of the 3rd jig | tool of this invention.

  Embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to such an embodiment, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

  FIG. 1 is a front view (a) and a side view (b) of one embodiment of the first jig 1 of the present invention, and FIG.

  The first jig 1 includes a disk 11 having a diameter d1 substantially equal to the outer diameter of the pipe to be socket-welded, a thickness t equal to the removal allowance, and a handle 12 attached to a substantially central part of the disk. .

  As shown in FIG. 4A, when a pipe 5 is newly inserted into a socket 7 attached to an object 6 to which the pipe is to be attached and welded, first, a first jig that matches the outer diameter of the pipe 5 is used. 1 is selected, and the handle 12 is held and inserted into the socket 7.

  As shown in FIG.4 (b), after inserting until the 1st jig | tool 1 strikes the innermost part 71 of a socket, as shown in FIG.4 (c), the piping 5 is inserted.

  The diameter d1 of the disk 11 is such that it can be smoothly inserted into the socket 7, that is, a diameter substantially equal to the outer diameter of the pipe 5 inserted into the socket, that is, the same as or slightly smaller than the outer diameter. And If the diameter d1 of the disk is too small, when the pipe 5 is inserted, the disk 11 or a part of the disk enters the pipe 5, and as a result, the inserted pipe 5 does not stop exactly before the removal allowance. Therefore, in order not to be so, a diameter substantially equal to the outer diameter of the pipe 5 is necessary.

  Since the disc 11 has a thickness t equal to the removal allowance, the inserted pipe 5 stays in front of the removal allowance from the innermost portion 71 of the socket in the state of FIG.

  As shown in FIG. 1, the handle 12 may be a simple one such as a rod attached at a right angle to the center of the disk 11, and the disk 11 can be securely inserted up to the innermost part 71 of the socket 7. When pulling out from the socket 7, it is preferable that the socket 7 is easily pinched from the outside without inserting a finger into the socket 7. The reason why the handle 12 is attached to the substantially central portion of the disk 11 is that the handle 12 does not get in the way when the pipe 5 is inserted after the first jig 1 is inserted into the socket 7.

  FIG. 2 is a front view (a) and a side view (b) of one embodiment of the second jig 2 of the present invention, and FIG.

  The second jig 2 has a cylindrical body 21 (first cylindrical body) having an inner diameter d2 substantially equal to the outer diameter of the pipe 5 to be socket welded, and the pipe is inserted into the cylindrical body 21. A function of fixing them to each other at an arbitrary position, for example, a set screw 22. The cylindrical body 21 is formed at a right angle to the axial direction of the cylindrical body so that the end surface 23 fits the inlet end of the socket 7, and the end surface 23 is 45 mm so as to be easily marked along the end surface 23. It is desirable to chamfer at an angle α of about °.

  In the state of FIG. 4C, after confirming that the tip of the pipe 5 has abutted against the socket innermost portion 71, the second jig 2 is slid along the pipe 5, and the state shown in FIG. As shown, the end face 23 of the cylindrical body is aligned with the inlet end 72 of the socket 7, and the pipe 5 and the cylindrical body 21 are fixed using the set screw 22 at that position. In the figure, the pipe is passed through the cylindrical body 21 of the second jig 2 before the pipe 5 is inserted into the socket 7, but the second jig is inserted after the pipe 5 is inserted into the socket 7. You can pass through 2.

  As shown in FIG. 5 (b), the pipe 5 is pulled out from the socket 7 with the second jig 2 fixed, and as shown in FIG. 5 (c), the socket side of the fixed cylindrical body 21 is pulled out. A marking line is made on the pipe side along the end surface 23 using the marking needle 8. If this marking line is aligned with the inlet end 72 of the socket 7 during temporary welding, it is possible to attach it while accurately protecting the specified removal allowance.

  The first jig 1 and the second jig 2 are made according to the type of the outer diameter of the pipe used at the work site, and distributed to the workers. The worker selects the first jig and the second jig that match the diameter of the pipe to be socket-welded and performs the work. Since the work is very clear as described above, when performing socket welding, especially in the case of socket welding performed in pipe repair work where there are many places where it is difficult to work in a narrow space, it is possible to remove without making an error. It is easy to be injured while keeping the bill exactly.

  Since the second jig 2 is fixed to the pipe 5, the pipe 5 can be pulled out from the socket 7, and scribing can be performed in a wide, easy-to-work place. be able to.

  FIG. 3 is a front view (a) and a side view (b) of one embodiment of the third jig 3 of the present invention, and FIG. 6 shows a method of using the same.

  The third jig 3 has an inner diameter d3 substantially equal to the outer diameter of the pipe 5 to be inserted into the socket 7, and has a transparent material having an end face 32 perpendicular to the axial direction of the cylindrical body at one end thereof, for example, A cylindrical body 31 made of acrylic resin.

  If the pipe is cut using a band saw at the work site and the cut surface may not be perpendicular to the pipe axis, use the third jig 3 for the type of outer diameter of the pipe used at the work site. It is made according to and distributed to workers. After the worker cuts the pipe 5 to be inserted into the socket 7, the worker selects the third jig 3 that matches the diameter of the pipe, and inserts the pipe 5 as shown in FIGS. 6 (a) and 6 (b). Then, the end face 32 is applied to the pipe end portion 51 cut.

  Since the third jig 3 is made of a transparent material, it can be easily visually confirmed whether or not the entire circumference of the pipe end portion 51 of the pipe is in close contact with the end surface 32 thereof. That is, if there is a place 53 where the end face 32 and the pipe end 51 are in close contact and a place 54 with a gap between them, the cutting of the pipe end 51 is not perpendicular to the pipe axis. If the end face 32 and the pipe end 51 are evenly in contact with each other, the cutting of the pipe end 51 is perpendicular to the pipe axis.

  By checking that the end of the pipe is cut at right angles to the pipe axis, the axis of the pipe does not match the axis of the socket when inserted into the socket. The position changes, and when the pipe is re-inserted into the socket for temporary attachment, the second marking line does not become parallel to the socket inlet end, and the removal allowance cannot be accurately maintained. The cause of bending or breaking can be removed beforehand.

  When socket welding is performed, the present invention can be widely applied particularly in the case of socket welding performed in pipe repair work where there are many places that are narrow and difficult to work.

DESCRIPTION OF SYMBOLS 1 1st jig | tool 11 Disk 12 Handle 2 2nd jig | tool 21 1st cylindrical body 22 Set screw 23 End surface 3 3rd jig | tool 31 2nd cylindrical body 32 End surface 4 Piping 6 Target object 7 Socket 71 Innermost part of socket 72 Entrance end of socket 8 Marking needle

Claims (3)

A disk having a diameter substantially equal to the outer diameter of the pipe to be socket-welded, a thickness equal to the removal allowance, a first jig comprising a handle attached to a substantially central portion of the disk, and the outer diameter of the pipe The end surface of the first cylindrical body is perpendicular to the axial direction of the cylindrical body, and the pipe is disposed in the first cylindrical body. A socket welding jig comprising the first cylindrical body and a second jig having a function of fixing the pipe to each other at an arbitrary position when the is inserted.   A second cylindrical body made of a transparent material having an inner diameter substantially equal to the outer diameter of the pipe, in addition to the first jig and the second jig according to claim 1, A socket welding jig comprising a third jig having an end face perpendicular to the axial direction of the second cylindrical body on the end face.   A method for socket welding of pipes using the socket welding jig according to claim 1.

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