JPH06134522A - Method for straightening recessed part of tube - Google Patents

Abstract

PURPOSE:To simply straighten the recessed part generated on the surface of a tube from the outside of the tube. CONSTITUTION:The recessed part of the tube is recovered to the origin by providing a block frame 16 on a standing guide spindle 12 freely movable up and down, moving the block frame 16 up and down with a hydraulic cylinder 17, together moving to open and close a pair of straightening jigs 20, 21 provided on the block frame 16 with hydraulic cylinders 18, 19, and pressurizing the tube from both sides with both straightening jigs 20, 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for straightening a recess in a pipe, that is, a method for straightening a recess in a pipe by applying pressure from both sides.

[0002]

2. Description of the Related Art Various building materials such as temporary scaffolding frames formed by using pipes are relatively roughly handled, so that recesses often occur on the outer surface. When it is reused as it is, it is necessary to correct the generated recess. By the way, as shown in FIG. 7, in a building frame 1 for temporary scaffolding, vertical columns 3 and 3 are welded to both ends of a horizontal member 2, and a reinforcing material is further provided between the horizontal members 2 and the vertical columns 3 and 3. Four, four
It is formed in the shape of a gate or torii with a gate.

[0003]

Generally, a recess formed in a pipe can be corrected by striking or pressurizing the recess from the inside of the pipe and pushing it outward. As shown in FIG. Further, both ends of the horizontal member 2 are closed, and when the horizontal member 2 has a recess A, the recess A
There is a problem that can not be corrected from inside. Therefore, the present invention has an object to provide a method for correcting a concave portion of a pipe, which can correct the concave portion formed in the pipe by applying pressure from the outside of the pipe, and which can surely correct the concave portion formed in the horizontal member in the building frame. And

[0004]

In order to solve the above-mentioned problems, the present invention is to press a pipe having a recessed portion so as to sandwich the recessed portion and to bulge the recessed portion to perform pre-retouching. It adopts a means for finishing and modifying the pipe cross-sectional shape by pressurizing the pipe from different directions. That is, the present invention uses a pair of jigs each having a semi-oval shaped concave portion circumscribing the pipe on the opposite surfaces, and the pipe in which the concave portion is formed is inserted from both sides in a state where the concave portion is located at the center between the jigs. The pipe is pressed by a jig, the concave portion of the pipe is bulged outward by this pressurization, and the cross-sectional shape of the pipe is made into an oval shape. It adopts a means for correcting the shape into a circle.

[0005]

[Function] A pipe having a concave portion on the outer surface is arranged between the jigs so as to be upright, and a portion having a concave portion of the pipe is positioned at the center between the separated jigs, and the hydraulic cylinder is operated in this state. Then, both pipes press the pipe from both sides in the direction perpendicular to the recess. The peripheral wall of the portion where the concave portion of the pipe is generated is pressed by both sides of the oval shaped concave portion to be pressed and the concave portion bulges outward, so that the pipe has an oval cross-sectional shape. Then, the peripheral wall of the pipe returns to the original circular cross section by pressing again from the direction in which the pressing direction is shifted by 90 degrees.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings. As shown in FIG. 1, FIG. 2 and FIG. 3, the guide columns 12 erected on the upper surface of the base plate 11 are supported vertically at a position closer to the upper side by the upper ends of columns 13 also fixed on the base plate 11. Is becoming
An auxiliary guide column 15 is vertically provided between the arm 14 provided at the upper end of the column 13 and the base plate 11 at one side position of the guide column 12.

As shown in FIG. 3, the block frame 16 having the rear center attached to the guide column 12 is formed in a U-shape in plan view with the front side opening, and is prevented from rotating along the guide column 12 and the auxiliary guide column 15. It can swing up and down,
Vertical movement is imparted by a hydraulic cylinder 17 that connects the upper end of the guide column 12 and the block frame 16, and
The vertical position can be set arbitrarily.

Hydraulic cylinders 18 and 19 are fixed to both sides of the tip end of the block frame 16 in a coaxially arranged manner, and hydraulic cylinders 18 and 19 approach and separate the inside of the block frame 16 facing each other. A pair of correction jigs 20 and 21 that recoil is provided.

As shown in FIG. 4, each of the straightening jigs 20 and 21 is provided with semi-oval shaped concave portions 22 and 23 on the opposite surface side thereof so as to correspond to the outer diameter of the pipe to be straightened. The jigs 20 and 21 for use have a space between the facing surfaces through which the pipe can pass when they are separated, and in the illustrated case, the building frame 1 shown in FIG.
In order to straighten the horizontal member 2, the straightening jig 20 is provided with a frame member 24 for storing the reinforcing member 4 between the hydraulic cylinder 18 and the Biston rod, the front side of which is openable and closable. There is.

A hydraulic electric pump 25 for the hydraulic cylinder 17 and a hydraulic electric pump 26 for the hydraulic cylinders 18 and 19 are installed on the rear portion of the base plate 11, and both the hydraulic electric pumps 25 and 26 have a foot switch 27, 28
The hydraulic cylinders 17, 18, and 19 are operated by the control.

The straightening method according to the present invention is carried out by using the straightening device having the above-mentioned structure, and the both straightening jigs 2 are used.
With 0 and 21 separated, as shown by the alternate long and short dash line in FIGS.
Tilt it sideways on the floor to fix the horizontal member 2 to the correction jigs 20 and 2.
The block frame 16 is set at the height position of the recess A formed in the horizontal member 2 by operating the hydraulic cylinder 17 by inserting the block frame 16 between them.

At this time, as shown in FIG. 4, the concave portion A is formed in the molding concave portion 2 in a direction perpendicular to the central portions with respect to the both correcting jigs 20 and 21.
The orientation of the building frame 1 is set so that it is located on the smaller diameter side of 2, 23. Therefore, depending on the orientation of the building frame 1, the reinforcing material 4 may interfere with the correction jig 20 side.
As described above, the reinforcing member 4 may be housed inside the frame member 24.

While the building frame 1 is positioned and held, both hydraulic cylinders 18 and 19 are extended so that the correction jigs 20 and 2 can be extended.
As shown in FIG.
Is simultaneously pressed from both sides by the semi-oval shaped concave portions 22 and 23. The horizontal member 2 is pressed from both sides in the direction perpendicular to the recess A on the large diameter side of both the molding recesses 22 and 23, so that the horizontal member 2 is pressed.
The pipes that make up the two parts are pressed from both sides by pressurization from both sides.
The recesses 2 and 23 escape toward the small-diameter portion, and the recess A bulges outward due to this escape, and as shown in FIG. 5, the horizontal member 2 disappears due to the oval cross-sectional shape. To do.

Next, both of the straightening jigs 20 and 21 are opened, and the horizontal member 2 is rotated with respect to the straightening jigs 20 and 21 from the initial position by an angle (for example, 90 degrees) to form an oval cross-section. 6 along the opening and closing directions of the two orthodontic jigs 20 and 21, and the two orthodontic jigs 20 and 21 are moved closer to each other, as shown in FIG.
The horizontal member 2 is pressed on the large-diameter side of the molding recesses 22 and 23 to modify the oval cross-section into a circular cross-section. In FIG. 6, the correction jigs 20 and 21 are moved 90 degrees.

In this way, the steel pipe having the recess A formed on the outer surface is pressed from both sides by the semi-oval shaped recesses 22 and 23, and the portion of the pipe where the recess A is formed is swollen to cross-section the pipe. If the shape is an egg shape, the position is shifted by 90 degrees, and pressure is applied again from the long axis direction of the egg shape, the concave portion A formed in the pipe disappears, and the shape can be corrected to a correct circular cross-sectional shape. In the illustrated embodiment, the correction of the recess A is performed on the horizontal member 2 of the building frame 1, but it can also be used to correct the recess of other pipes such as a pipe support that is a building material. . Further, although the hydraulic cylinder 17 is used to set the vertical height position of the block frame 16, for example,
It is also possible to suspend the balancer weight corresponding to the total weight of the block frame 16 side and move it up and down by manual operation for positioning.

[0016]

As described above, according to the present invention, the pipe is pressed from both sides with the semi-oval molding concave portions of the pair of orthodontic jigs to make the pipe into an oval cross-sectional shape, and then the different angle directions are applied. Since the concave portion of the pipe is corrected by applying pressure again from above, the concave portion formed in the pipe can be surely corrected from the outside, and the concave portion can be corrected even in the condition that the concave portion cannot be corrected from the inside of the pipe. It will be possible.

[0017]

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a straightening device for carrying out a method for straightening a recess of a pipe according to the present invention.

FIG. 2 is a front view of the correction device shown in FIG.

3 is a plan view of the correction device shown in FIG. 1. FIG.

4 is a cross-sectional plan view showing a pipe before straightening by a straightening jig in the straightening device shown in FIG. 1. FIG.

5 is a transverse cross-sectional view showing a state during pipe straightening by a straightening jig in the straightening device shown in FIG. 1. FIG.

6 is a cross-sectional view showing the completion of pipe straightening by a straightening jig in the straightening device shown in FIG.

FIG. 7 is a front view showing an example of a target building frame for carrying out the method for correcting a recess of a pipe according to the present invention.

[Explanation of symbols]

 11 Base Plate 12 Guide Strut 13 Strut 14 Arm 15 Auxiliary Guide Strut 16 Block Frame 17, 18, 19 Hydraulic Cylinder 20, 21 Straightening Jig 22, 23 Forming Recess 24 Frame Member 25, 26 Hydraulic Electric Pump 27, 28 Foot Switch

Claims (2)

[Claims] 1. A pipe having a concave portion is pressed so as to be sandwiched, the concave portion is bulged outward to perform a preliminary modification, and then the pipe is pressurized from a different direction to finish-modify the pipe cross-sectional shape. A method for straightening a concave portion of a pipe, characterized by: 2. A pair of jigs each having a semi-oval shaped concave portion circumscribing the pipe on the opposite surfaces are used, and the pipe having the concave portion is cured from both sides in a state where the concave portion is located at the center between the jigs. With a tool, pressurize the pipe to bulge outward to make the cross section of the pipe oval, and then press the pipe with a jig to move it 90 degrees. A method for straightening a concave portion of a pipe, which comprises straightening a circular shape.