JPH0357291Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial field of application) This invention is suitable for relatively large diameter piping (for example,
This relates to the improvement of a device for correcting deformation of pipe ends so that they become close to a perfect circle prior to butting and welding the ends of pipes (of pipes of 3 m or more).

(Conventional technology) Conventionally, in order to straighten the end of a large-diameter pipe with an inner diameter of 3 m or more, a jack is installed inside the end of the pipe, and the inner diameter of the pipe is expanded by stretching it. This is done by repeating this process while shifting the

Also, for example, in the publication of Utility Model Application Publication No. 50-58024,
An even number of cylinders are attached to a frame body equipped with legs that can be adjusted up and down, and an even number of cylinders are attached at equal intervals in the circumferential direction, and a shoe that comes into contact with the inner peripheral surface of the cylindrical article is connected to the tip of the rod of the cylinder. An apparatus for forming a cylindrical article into a perfect circle is described in which a rotary valve is interposed between the cylinder and a hydraulic power source so that the cylinders at paired positions along the diameter direction of the cylinder are operated simultaneously.

(Problems to be solved by the invention) Among the conventional methods mentioned above, the former method requires the repeated movement of a large and heavy jack and the installation in an awkward position, resulting in labor-intensive and labor-intensive work. There is a point. Furthermore, since there is no effective means for fixing the once deformed portion, it is not easy to correct the roundness by repeating deformation while shifting the position.

Further, in the latter case, since a plurality of cylinders are provided in a radial manner, the device becomes large and heavy. Therefore, although this device can be used for welding cylindrical articles in a factory, it is not suitable for use at the installation site.

The present invention aims to solve the above-mentioned conventional problems and provide a simple device that can easily straighten piping with relatively simple light work.

(Means for Solving the Problems) In the present invention, in order to solve the above-mentioned conventional problems, a large number of set bolts 2 for pressing and deforming the inside of the pipe P outward can be protruded radially outward. an annular member 1 held; an adjustment nut 4 located outside the annular member 1 and screwed onto the set bolt 2; and an adjustment nut 4 that arbitrarily fixes the protruding length of the set bolt 2 by contacting the annular member 1; A correction device is constituted by a hydraulic device 6 that can be fitted into the inside of the annular member 1.
A cylinder 7 whose one end is inscribed in
The piston rod 8 is inserted into the piston rod 8 and can press the set bolt 2 outward.

(Function) In the pipe straightening device of the present invention, the annular member 1 is inserted inside the end of the pipe P, the adjusting nut 4 is turned to adjust the outward protrusion length of the set bolt 2, and the set bolt 2 is used to tighten the annular member 1. is temporarily supported inside the pipe P. After measuring the shape of the pipe end and confirming the part to be deformed, the hydraulic device 6 is set inside the annular member 1, and one end of its cylinder 7 is inscribed in the annular member 1, and the hydraulic device 6 is expanded. The tip of the piston rod 8 is directed toward the inner end of the set bolt 2 at the position where the diameter should be adjusted, and hydraulic pressure is applied to the cylinder 7. As a result, the piston 8 protrudes and pushes the set bolt 2 outward, and the set bolt 2 presses the inner surface of the pipe P, causing the contact portion to bend outward. When the abutment part is bent, turn the adjusting nut to bring it into contact with the outside of the annular member while keeping the hydraulic pressure applied, and then release the hydraulic pressure. The correction part is now fixed. Next, the hydraulic device 6 is rotated inside the annular member 1 to change its installation direction as appropriate, and the piping P is sequentially moved.
By enlarging the diameter of the required part and fixing it with a nut 4, the end of the pipe is corrected so that it approaches a perfect circle. During this time, the annular member 1 remains installed inside the pipe P, and only the hydraulic device 6 needs to be moved.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 to 3.
FIG. 1 is a front view of the correction device, FIG. 2 is a sectional view of the correction device, and FIG. 3 is a perspective view of the hydraulic device.

In FIGS. 1 and 2, reference numeral 1 denotes an annular member, and the annular member 1 has a large number of through holes 1a radially provided at equal intervals. A large number of set bolts 2 for pressing and deforming the inside of the pipe P outward are inserted into the through hole 1a so as to be able to project radially outward, and pins 3 penetrate the annular member 1 and engage with the long grooves 2a. It is prevented from falling out. That is, the set bolt 2 is movable in the axial direction within the range of the long groove 2a. In addition, the set bolt 2 has an outer peripheral threaded portion 2.
An adjustment nut 4 is screwed onto b, and by screwing and adjusting the adjustment nut 4, the length of the set bolt 2 protruding from the annular member 1 can be adjusted. Note that the annular member 1 is
In this embodiment, in order to increase the strength, the plate-shaped portion 1b
Although it is connected by , it can be literally ring-shaped.

The hydraulic device 6 is fitted inside the annular member 1 and can be rotated, and a cylinder 7 inscribed in the annular member 1
is inserted into this cylinder 7, and the set bolt 2
and a piston rod 8 that can be pushed outward.

The cylinder 7 is connected to a hydraulic pump (not shown), and the piston rod 8 can be projected by hydraulic pressure. As shown in FIG. 3, the end of the cylinder 7 is formed in an arc shape along the inner periphery of the annular member 1, and the outer edge of the cylinder 7 is provided with the annular member 1 when installed.
A protruding piece 7a is formed along the side surface. Also,
At the end of the cylinder 7, a lever 9 protrudes outward for engaging an engagement recess 1c formed at a position corresponding to each set bolt 2 on the inner edge of the annular member 1 to determine the position of the hydraulic device 6. It is biased so as to That is, the lever 9 has its base end connected to the clevis 10.
By screwing the clevis 10 into a housing groove 7b formed at the end of the cylinder 7, the clevis 10 is supported so as to be able to rise and fall freely within the housing groove 7b, and its intermediate portion is provided within the housing groove 7b. It is attached so that it is biased in the upright direction by a tabular spring 11.

Next, the operation of this embodiment will be explained. In the pipe straightening device of this embodiment, the annular member 1 is inserted inside the end of the pipe P, the adjusting nut 4 is turned to adjust the outward protrusion length of the set bolt 2, and the set bolt 2 is used to fix the annular member 1 in the pipe. Temporarily support inside P. After measuring the shape of the end of the pipe P and confirming the portion to be deformed, the hydraulic device 6 is set inside the annular member 1. The hydraulic device 6 is set by bringing one side of the hydraulic device into contact with the plate portion 1b of the annular member 1, and by bringing the projecting piece 7a into contact with the outer surface of the annular member 1, and then tightening the set bolt 2 at the position where the diameter should be expanded.
This can be easily done by directing the tip of the piston rod 8 toward the inner end of the piston rod, engaging the lever 9 with the engagement recess 1c of the annular member 1, and inscribing the end of the cylinder 7 in the annular member 1. can. Then, when hydraulic pressure is applied to the cylinder 7, the piston 8 protrudes and pushes the set bolt 2 outward, and the set bolt 2 presses the inner surface of the pipe P to bend the abutting portion outward. Since the other plurality of set bolts 2 are in contact with the inside of the pipe, the reaction force due to the pressing is not applied only to the paired portions, and therefore the paired portions are not deformed at the same time. Then, by rotating the hydraulic device 6 inside the annular member 1 and changing its installation direction as appropriate, sequentially expanding the diameter of the required part of the pipe P and repeating the work of fixing it with the nut 4, the end of the pipe P is fixed. Correct the part so that it is close to a perfect circle. During this time, the annular member 1 remains installed inside the pipe P, and only the hydraulic device 6 needs to be moved along the inside of the annular member 1, so the work is not very labor intensive. Incidentally, the length of the cylinder 7 or piston rod 8 is reduced by the length of the set bolt 2, and the members that require movement are particularly reduced in size and weight.

(Effects of the invention) As described above, the present invention includes an annular member 1 that holds a large number of set bolts 2 so as to be able to protrude radially outward for pressing and deforming the inside of the piping P outwardly, and this annular member. an adjustment nut 4 which is located on the outside of the annular member 1, is screwed onto the set bolt 2, and arbitrarily fixes the protruding length of the set bolt 2 by abutting against the annular member 1; The hydraulic device 6 constitutes a straightening device, and the hydraulic device 6 includes a cylinder 7 whose one end is inscribed in the annular member 1, and a piston rod 8 that is inserted into the cylinder 7 and can press the set bolt 2 outward. Therefore, it can be easily installed by simply rotating the hydraulic device 6 along the inside of the annular member 1 and directing its piston rod 8 to the required set bolt 2 of the annular member 1, and is relatively small and lightweight. Since it is only necessary to rotate the hydraulic device 6, which is configured as shown in FIG.
You can proceed with your work quickly. The correction work is
Expansion of the diameter of the required part of the pipe P by the operation of the hydraulic device 6;
Fixing the enlarged diameter part with the nut 4, moving the hydraulic device 6,
This can be easily done by repeating the above steps, and since the portion whose diameter has been once expanded is successively fixed with the nut 4, there is no risk of deformation occurring due to subsequent diameter expansion of other portions.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of a straightening device, FIG. 2 is a sectional view of the straightening device, and FIG. 3 is a perspective view of a hydraulic device. 1... Annular member, 2... Set bolt, 4...
Adjustment nut, 6...Hydraulic device, 7...Cylinder, 8
... Piston, P ... Piping.

Claims (1)

[Scope of Claim for Utility Model Registration] An annular member that holds a number of set bolts so as to be able to protrude radially outward for pressing and deforming the inside of the piping outward; an adjustment nut that arbitrarily fixes the protruding length of the set bolt by coming into contact with the annular member, and a hydraulic device that can be fitted inside the annular member, the hydraulic device being fitted into the annular member. A piping straightening device comprising: an inscribed cylinder; and a piston rod inserted into the cylinder and capable of pressing the set bolt outward.