JPH05189B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention is applicable to cases in which a valve body is sandwiched between two flanges connected to piping with a welded joint, and the two flanges are tightened with mounting bolts such as stud bolts to clamp and fix the valve body. This invention relates to a flange opening jig that is convenient to use when removing the valve body.

[Conventional technology]

By expanding the spacing between the flanges welded to the piping,
When removing the valve body held between the flanges, conventionally a plurality of bolt type jacks were placed between the two flanges, and the threaded rod of the jack was rotated to extend the length of the jack, thus reducing the flange spacing. It was expanding.

[Problem to be solved by the invention]

However, extending all of the bolt-type jacks mentioned above to approximately the same extent so that unbalanced loads are not applied is complicated and takes a long time, and when uneven loads are applied, the bolt-type jacks There was a problem that it easily came off the flange surface, which was a particular problem when working at unstable heights. The present invention aims to eliminate the above-mentioned conventional drawbacks.

[Means to solve the problem]

In order to achieve the above object, in the flange opening jig of the present invention, pieces for flange engagement are removably provided at the tips of the two arms, and the rear ends of the two arms are attached in a bifurcated manner. A sleeve having a threaded inner surface with opposite thread directions is attached to the inside of the arm so as to be rotatable in an upright plane including the longitudinal axis of the arm, and is screwed onto the threaded inner surface. At the same time, connect the two arms in a facing state with adjustment bolts, and screw a push bolt into the through screw hole drilled at the tip of one arm, and use the tip of the push bolt to connect the other arm. It is brought into contact with the surface. It is preferable that the bridge body has a protruding cantilever-like portion, and a U-shaped groove is bored in the front edge of the cantilever-like portion, the size of which allows the flange mounting bolts to be loosely fitted therein.

[Effect]

By turning the adjustment bolt and push bolt alternately, the two arms are opened substantially parallel to each other, so that the piece at the tip of the arm and the flange surface are in contact with each other. When the push bolt is turned and only the adjustment bolt is turned, the arm tilts with the push bolt as a fulcrum due to the proximity of the two sleeves, so the piece body is pushed apart to open the space between the flanges, and the push bolt expands. The force is amplified by the lever principle. The U-shaped groove of the bridge allows the bridge to be inserted deeply between the flanges even when flange mounting bolts are present.

【Example】

In the example shown in Fig. 3, a valve body C is provided between two flanges B, B connected to a pipe A by a welded joint, and the valve body C is tightened with flange mounting bolts D such as stud bolts. The clamp is fixed. An embodiment of the flange opening jig of the present invention for expanding the gap between the two flanges B and B is shown in FIGS. 1 and 2. Each of the two arms 1, 1 has an engaging groove 2, 2 bored in the tip thereof in a direction perpendicular to the longitudinal direction of the arms 1, 1, and a piece described later is inserted from the side of the engaging groove 2, 2. The bodies 14, 14 are fitted and fixed by screws 18, 18. The rear ends of the two arms 1, 1 are bifurcated attachment parts 3, 3, and on the inside of the bifurcated attachment parts 3, 3, there are stops attached to the sides of the bifurcated attachment parts 3, 3. Sleeves 5,5 rotatably mounted by screws 4,4 are rotatable in an upright plane containing the longitudinal axis of the arms 1,1. The inner surfaces of the two sleeves 5, 5 are threaded inner surfaces 6, 6, and if one has a positive thread orientation, the other has a negative thread orientation. By threading the threaded rod portions 8, 8 of the adjustment bolt 7 into the threaded inner surfaces 6, 6, the two arms 1, 1 are connected in a facing state. The center portion 9 of the adjustment bolt 7 has a hexagonal nut shape that can be fitted with a spanner or the like, and the direction of the threads of the threaded rod portions 8, 8 formed on the upper and lower sides of the center portion 9 corresponds to the threaded inner surface 6 of the two sleeves 5, 5. , 6 are screwed together, so they are reversed from each other. A through screw hole 11 is formed in one arm 1 and a push bolt 10 is screwed therein, so that the tip of the push bolt 10 can come into contact with the upper surface of the other arm 1, as shown in the figure. In this example, a stopper 12 is fitted to the tip of the push bolt 10 and fixed with a pin 13. Piece bodies 14, 14 attached to the tips of arms 1, 1
has cantilever-shaped portions 15, 15 protruding from each other, and the front end edges of the cantilever-shaped portions 15, 15 are provided with U-shaped grooves 16, 1 having a size that allows loose fitting of flange mounting bolts.
6 is drilled. Valve bodies of various sizes C
Since the distance between the flanges B and B varies according to Pieces of different sizes 1
It is a good idea to prepare 4 and 14. Next, how to use the above jig will be explained with reference to FIGS. 3 and 4. First, replace the piece bodies 14, 14 with sizes that match the distance between the flanges B, B, and securely fasten them with setscrews 18, 18. Loosen all the nuts of the flange mounting bolts D such as stud bolts, and remove the mounting bolts that will get in the way of securing the exit path for the valve body C as shown by dotted lines in FIG. Although only one flange opening jig is shown in FIG. 3, two are prepared in order to arrange them diagonally as shown in FIG. 4. The adjustment bolts 7 and push bolts 10 are turned alternately to spread the arms in parallel so that the surfaces 17, 17 of the pieces 14, 14 are brought into contact with the flanges B, B. The pieces 14, 14 are inserted between the flanges B, B so that the flange mounting bolts D fit into the U-shaped grooves 16, 16 of the pieces 14, 14. Use a wrench etc. to tighten the center part 9 of the adjustment bolt 7.
Turn to bring the two sleeves 5, 5 closer to each other. Then, the arms 1, 1, which are rotatable by the set screws 4, 4, are tilted about the push bolt 10, and the pieces 14, 14 of the arms 1, 1 are expanded outward. The distance between the two flanges is forcibly expanded. In other words, by simply turning the center part 9 of the adjustment bolt 7 with a spanner, etc., the piece body 1
4 and 14 are amplified based on the principle of levers. To reinstall the removed valve body C, the operations described above may be performed in reverse.

【Effect of the invention】

As explained above, the piece of the jig is removable, so by replacing it with a piece whose size L is close to the distance between the flanges, you can increase the travel distance and travel time until the flanges come into contact. The target can be shortened. A light force is required to alternately rotate the adjustment bolt and push bolt until the bridge body comes into contact with the flange. After the bridge body comes into contact with the flange, by turning only the adjustment bolt, the space between the flanges can be reliably and safely opened by expanding the two bridge bodies using the lever principle. As mentioned above, the work efficiency is good, and work time that would have taken 20 minutes in a normal area is now 5 minutes, and work that would have taken 40 minutes in a controlled area under high radiation conditions is now 10 minutes. It can be significantly shortened. This is extremely effective when radiation exposure of workers is a problem.
It also allows one person to perform unstable work at high places or in narrow spaces, improving work efficiency. In addition, it is possible to avoid applying unnecessary force or damage to the valve body or piping.

[Brief explanation of the drawing]

FIG. 1 is a side view of a flange opening jig showing one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are perspective views for explaining the state of use thereof. 1...Arm, 3...Bifurcated mounting part, 5...Sleeve, 6...Inner surface of screw, 7...Adjustment bolt, 1
0...Push bolt, 11...Threaded screw hole, 14...
...piece body, 15...cantilever-like portion, 16...U-shaped groove.

Claims (1)

[Claims] 1. A piece for opening a flange is removably provided at the tips of the two arms, and screw threads opposite to each other are provided inside the bifurcated attachment portions at the rear ends of the two arms. A sleeve having a threaded inner surface oriented in the direction of is mounted so as to be rotatable in an upright plane containing the longitudinal axis of the arm, and an adjustment bolt screwed onto the inner surface of the thread allows the two arms to face each other. As well as connecting to the state,
1. A flange opening jig, characterized in that a push bolt is screwed into a through screw hole drilled at the tip end of one arm, and the tip of the push bolt is brought into contact with the upper surface of the other arm. 2. A claim in which the piece body has a protruding cantilever-like portion, and a U-shaped groove is bored in the front edge of the cantilever-like portion, the size of which allows loose fitting of flange mounting bolts. 1 flange opening jig.