JPH02199395A - Fixing device for saddle joint - Google Patents

Abstract

PURPOSE:To surely stick to the outer periphery of a pipe by providing a pair of pressing sections excited by springs on the right and left of a saddle holder liftably fixed via a lifting rod and pressing both flanges and the branch of a saddle joint. CONSTITUTION:A lifting rod 8 is screwed into the female screw hole of the horizontal section of a lifting body 6, and a saddle holder 10 is rotatably fixed on the lifting rod 8. The saddle holder 10 has a horizontal bar 11 extended in the right and left directions, and pressing bodies 13 are slidably fitted to the slits of the horizontal bar 11 via springs 15. A saddle joint T is coupled with a pipe P, the pressing bodies 13 are brought into contact with both flanges Tf of the joint T while spring forces are adjusted. The lifting rod 8 is lowered under this condition, the branch Tb and both flanges Tf of the joint are pressed by the saddle holder 10, and the saddle holder 10 is stopped when a fixed reaction force is generated. The connecting work is secured accordingly.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a fixing device for a saddle joint.

(Conventional technology) Conventionally, when connecting pipes made of thermoplastic resin such as polyethylene, a heating element such as a resistance wire was buried in the joint surface of the joint with the pipe, and the pipe was inserted and connected to this joint. A technique is known in which the resin is melted by appropriately heating the heating element in the state, and the pipes are joined via a joint.

On the other hand, in order to connect a branch pipe to a pipe, either provide a connection port for the branch pipe on the pipe, fit a saddle joint to the pipe so that it matches the connection port, and perform the above-mentioned fusion bonding, or After welding the joint, create a connection port on the pipe using the cutter installed inside the saddle joint. By the way, in order to fusion-bond a saddle joint to a pipe, press the saddle joint against the pipe so that the inner circular arc surface of the saddle joint uniformly contacts the outer circumferential surface of the pipe, and also press the saddle joint against the pipe so that it is completely joined and reaches the specified position. Until strength is developed, it is necessary to firmly hold it against deformation caused by thermal strain.

For these reasons, a saddle joint fixing device as shown in Japanese Patent Laid-Open No. 61-184295 has been proposed. That is, the fixing device includes a stirrup device having a holding device arranged to engage the pipe at a position facing the fitting and engaging the fitting near one side edge of the fitting; It comprises a clamp mechanism attached to the stirrup device and capable of engaging the fitting near the other side edge of the fitting.

(Problem to be Solved by the Invention) However, in the saddle joint fixing device described above, since the flanges on both sides of the saddle joint are pulled and pressed against the pipe, the pipe may be deformed due to storage conditions, temperature, etc. If so, the inner circumferential arcuate surface of the saddle joint may only partially contact the outer circumferential surface of the pipe, resulting in a gap between the two. When fusion bonding is performed in such a state, there is a problem in that the molten resin moves into the above-mentioned gap and the desired strength is not achieved. In addition, there was a problem in that the resistance wire moved as the resin moved, resulting in a short circuit and abnormal heat generation, which prevented normal fusion.

Moreover, when the flanges on both sides of the saddle joint are pulled, a reaction force against bending is generated due to the rigidity of the saddle joint, so it is necessary to apply a large amount of pressure in order to make the inner circular arc surface of the saddle joint evenly adhere to the outer peripheral surface of the pipe. Attaching requires force.

However, considering that such joining work is performed in a narrow space, for example, inside a trench excavated to a predetermined depth on a road, there is a problem that the workability is poor.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a saddle joint fixing device that can easily and uniformly join a saddle joint to a pipe in close contact with the pipe.

(Means for Solving the Problems) The present invention provides a structure that includes a base body forming a pipe mounting portion, a lift body that can be fixed at an appropriate height with respect to the base body, and a lift rod equipped with an operating handle. It consists of a saddle holder fixed to the elevating body so as to be able to rise and fall freely, and a pair of pressing parts disposed on the left and right sides of the saddle holder and urged via a spring between the saddle holder and the saddle holder, By lowering the saddle holder, both flanges and branches of the saddle joint fitted to the pipe can be pressed by the pressing portion and the saddle holder, respectively.

(Function) First, the base body is inserted into the elevating body, and the elevating body and the base body are fixed at a height position set corresponding to the outer diameter of the pipe.

On the other hand, a saddle joint is fitted into a predetermined position of the pipe, and the pipe is placed on a mounting portion of the base body formed to match the outer diameter of the pipe.

After each of the pair of pressing parts is moved to face both flanges of the saddle joint, the pressing parts are moved up and down to adjust the spring force applied to the flanges of the saddle joint. Next, when the operation handle is operated to lower the saddle holder, the pressing part contacts both flanges of the saddle joint,
Start pressing. Furthermore, if the operating handle is still operated, the pressing portion presses both flanges of the saddle joint due to the biasing force of the spring until the saddle holder descends and presses the branch of the saddle joint.

In this way, when a certain reaction force is generated by the branch and flange of the saddle joint being pressed by the saddle holder and the pressing part, the torque limiter of the operating handle is activated and the lowering of the saddle holder is stopped. .

Thereafter, by heating the heating element embedded in the saddle joint, the resin melts and the saddle joint can be fused and joined to the pipe. When the joining operation is completed, the saddle holder and the pressing portion are separated from the branch and the flange, respectively, by rotating the operating handle in the opposite direction to that described above.

After that, a connection port is made in the pipe using a cutter installed inside the saddle joint.

Note that a connection port may be opened in the pipe before fitting the saddle joint to the pipe.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a fixing device, and this fixing device 1 is composed of a support frame 2 formed in a U-shape, and a pressing frame 3 provided so as to be movable up and down with respect to the support frame 2.

The support frame 2 is composed of an L-shaped base 5 on which a pipe P is placed 4 and an inverted-shaped elevating body 6 that is fitted into the base 5, as shown in FIG. When the base body 5 is fixed to the elevating body 6, it forms a U-shape. Further, the vertical portion 5a of the base body 5 is provided with a plurality of small holes at appropriate intervals, while the vertical portion 6a of the elevating body 6 is also provided with a single small hole. Therefore, by inserting the fixing bottle 7 between an arbitrary small hole provided in the base body 5 and a small hole provided in the elevating body 6, both can be fixed. In this case, the positions of the plurality of small holes provided in the base 5 are uniquely determined by the outer diameter of the pipe P. In other words, when placing a pipe with a certain outer diameter,
When placing a pipe with a different outer diameter, the small hole through which the fixing bin 7 is inserted will be different, and as a result, the height between the horizontal part 5b of the base 5 and the horizontal part 6b of the elevating body 6 will be the same as that of the pipe P. This is a specific value that corresponds to the outer diameter.

Note that, contrary to the above, a plurality of small holes may be provided in the elevating body 6, and a single small hole may be provided in the base body 5.

Further, a liner R can be disposed on the mounting portion 4 formed on the horizontal portion 5b of the base 5 in accordance with the outer diameter of the pipe P.
By replacing and arranging liners R with different inner diameters on the mounting portion 4, it becomes possible to place many types of pipes P with different outer diameters without changing the base 5. .

Furthermore, a mounting portion 4 is provided at a suitable position on the horizontal portion 6b of the elevating body 6.
A female threaded hole is formed with its center line being a perpendicular line passing through the center of curvature of , and an elevating rod 8 for elevating and lowering a saddle holder 10 of a pressing frame 3, which will be described later, is screwed into this female threaded hole.

The pressing frame 3 includes a saddle holder 10 that can be raised and lowered by a lifting rod 8 with respect to the lifting body 6 described above, and a pressing body 13 that is pressed between the saddle holder 10 and the saddle holder 10 .

The saddle holder 10 is equipped with a lifting rod 8 so as to be able to move up and down with respect to the lifting body 6, and as shown in FIG. The saddle holder 10 is loosely clamped by the head 8b of 8 so as to be freely rotatable, and the saddle holder 10 is rotatably fixed to the elevating rod 8.

Further, the lifting rod 8 has an operating handle 9 integrally fixed to its shaft portion 8a, and by rotating the operating handle 9, the lifting rod 8, that is, the saddle holder 10 can be moved up and down with respect to the lifting body 6. It can be raised and lowered.

Although the operation handle 9 is not shown in detail,
It has a built-in torque limiter so that it will idle if torque above a certain level is applied.

By the way, the saddle holder 10 is integrally equipped with horizontal bars 11.11 extending in the left-right direction, and these left and right horizontal bars 11.11 form a slit 12 in the longitudinal direction. The slit 12 has the slit 1
Pressing bodies 13, 13 that are slidable along 2 are attached.

The pressing body 13 is a saddle joint T fitted into the pipe P.
a pressing part 14 that presses the flange T"; and the pressing part 14.
and a spring 15 disposed between the horizontal bar 11;
It is comprised of a wing nut 16 that is screwed onto the rod of the pressing part 14 fitted into the slit 12 to adjust the distance between the horizontal bar 11 and the pressing part 14.

On the other hand, the saddle holder 10 presses the branch Tb of the saddle joint T, and as the saddle holder 10 descends in conjunction with the lowering of the lifting rod 8, the branch Tb of the saddle joint T is pressed against the head of the lifting rod 8. 8b.

Next, the operation of this embodiment will be explained based on FIG. 3.

First, a liner R having an inner diameter corresponding to the outer diameter of the pipe P is prepared, and the liner R is placed on the mounting portion 4 of the base 5. Then, insert the base body 5 into the elevating body 6, and
By inserting the fixing pin 7 between the small hole corresponding to the outer diameter, the two are appropriately fixed. In this state, the saddle joint T is fitted to the pipe P at a predetermined position on the pipe P, and then the pipe P is placed on the litchi R placed on the mounting portion 4 of the base body 5.

Next, the flange Tf of the saddle joint T is pressed by the pressing portion 14.
The pressing body 13 is pressed against the horizontal bar 11 so that the
At the same time, the horizontal bar 11 and the pressing part 1
The wing nut 16 is rotated until the distance between the pipes 4 and 4 reaches the distance set by the outer diameter of the pipe P. That is, the spring force is adjusted to a desired value in accordance with the saddle joint T to be fitted.

After that, after setting the torque of the operating handle 9 to a constant value, by rotating the operating handle 9, the saddle holder 1
0 and the saddle holder 10, the pressing body 13 is lowered.

At this time, although not shown in detail, the branch Tb of the saddle joint T and the saddle holder 10 are fixed so that a desired pressing force can be generated in accordance with the size of the saddle joint T, that is, the outer diameter of the pipe P. The distance between the heads 8b of the lifting rods 8 can be adjusted by arranging one or more spacers to adjust the amount of descent of the saddle holder 10, or by adjusting the distance between the heads 8b of the lifting rods 8.
The biasing force of the spring 15 is adjusted by disposing one or more spacers between the flange Tf and the pressing portion 14. The number of spacers is preset corresponding to the outer diameter of the pipe P.

The saddle holder 10 is rotated by rotating the operating handle 9.
falls to a predetermined position, the pressing part 14 presses the flange Tf of the saddle joint T with a certain urging force, and at the same time, the head 8b of the lifting rod 8 presses the branch Tb of the saddle joint T with a predetermined force. The rotational torque becomes excessive, a torque limiter (not shown) is activated, and the operating handle 9 rotates idly with respect to the lifting rod 8.

After that, if a power supply voltage is supplied for a predetermined period of time through a terminal (not shown) provided on the saddle joint T, the saddle joint T
The heating element buried in the fitting part with the pipe P heats up,
Since the saddle joint T is melted, the saddle joint T can be fusion-bonded to the pipe P. Once the fusion is complete and the joint has solidified and the joint strength has been achieved, remove the fixing device.
A connection port is created in the pipe using a cutter installed inside the saddle joint.

In this example, the joint is heated using electric energy to perform fusion bonding, but for other types of joints, for example, a metal piece is buried in the joint surface of the saddle joint with the pipe, and ultrasonic waves are used to join the joint. Alternatively, heating can be performed using electromagnetic waves.

Further, the fixing device of the present invention can also be used to adhesively bond a pipe and a saddle joint with an adhesive and then maintain that state until the adhesive strength is achieved.

(Effects of the Invention) As described above, according to the present invention, when joining a saddle joint to a pipe, the pressing force is adjusted by making the pressing parts face each other on both flanges of the saddle joint, and the saddle holder is lowered by the operating handle. Since the branch and both flanges of the saddle joint can be pressed with a simple operation, it is possible to apply a pressing force to the saddle joint so that it comes into close contact with the outer circumferential surface of the vibrator, ensuring reliable joining work. It can be carried out.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the saddle joint fixing device of the present invention, and FIG. 1 is an overall front view thereof, FIG. 2 is a side view thereof, and FIG. It is an explanatory diagram when performing joint work. 2...Support frame 3...Press frame 5...
・Base body 6... Elevating body 10... Saddle holder 13... Pressing body Patent applicant Representative of Sekisui Chemical Co., Ltd. Hiroshi 1) Kaoru diagram 3rd prisoner

Claims (1)

[Claims] 1) A base body forming a pipe mounting part, an elevating body that can be fixed at an appropriate height with respect to the base body, and a lifting rod that is fixed to the elevating body so as to be movable up and down with an operating handle. It consists of a saddle holder and a pair of pressing parts that are placed on the left and right sides of the saddle holder and are biased through a spring between the saddle holder and the saddle holder. 1. A fixing device for a saddle joint, characterized in that both flanges and branches of the saddle joint are configured to be pressed by the pressing portion and the saddle holder, respectively.