JP2007185672A - Apparatus for bending shapes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make bending work possible without buckling the web by dispersing pressing load which is generated when bending a wide flange shape. <P>SOLUTION: The wide flange shape 1 is bent so that one side of flanges 3a, 3b is taken as the side of the outside diameter and the other side as the side of the inside diameter with pressing rollers 4, 5, 6. By arranging an elongation and contraction support structures 7 between the flanges 3a, 3b of the wide flange shape 1 to be bent and both ends of the support structures 7 are brought into contact with the flanges 3a, 3b. When bending the wide flange shape 1 with the pressing rollers 4, 5, 6, the load to which the web is subjected is taken as not larger than the buckling load by dispersing the pressing load with the pressing rollers 4, 5, 6 through the support structures 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for bending a shaped steel that enables bending of a shaped steel such as an H-shaped steel.

  Since shape steel has high strength as a member, it has been widely used as a building material for various buildings.

  Depending on the application, this type of shape steel may be used in a straight line or may be bent to a required curvature.

  For example, the roof of a tank for storage of liquefied natural gas (LNG) has a gentle curved surface that swells outward, and the shape steel used as the aggregate of the roof of such an LNG tank, particularly the H-section steel, A material that has been bent into a gently curved surface is used.

  As the H-section steel used for such a curved structure, a built-in flange is formed by abutting the center portion of a flange formed by bending to the same curvature on a previously formed curved surface. An up-stretched one is used, or one obtained by bending an H-shaped steel obtained by assembling a straight web and a straight flange is used.

  In recent years, as shown in FIG. 6, there has been proposed a method of bending the latter H-shaped steel to a required radius of curvature after manufacturing.

  That is, a pair of fixed rollers b and c are disposed on the outer diameter side when the H-shaped steel a is bent so that one flange is on the outer diameter side and the other flange is on the inner diameter side. A press roller d for applying a pressing force to the H-section steel a is disposed on the inner diameter side of the H-section steel a near the middle of the fixed rollers b and c, and the inner diameter side of the H-section steel a is pressed by the press roller d. Is pressed to bend the H-shaped steel a supported by the two fixed rollers b and c. Further, rollers (pinch rollers) f and g are arranged inside and outside the flange e on the outer diameter side in the vicinity of the middle between the two fixed rollers b and c so as to press the flange e from the inside and outside, and the roller F and g can be moved to the outer diameter side, and when pressing the H-section steel a with the press roller d, the rollers f and g are moved in the direction in which the pressing force of the press roller d acts (outer diameter direction). Thus, the outer diameter side flange e is pulled toward the outer diameter side. As a result, when the H-shaped steel a is bent by being pressed by the press roller d, the pressing load of the web h is reduced by pulling the web h on which the pressing load is applied, so that buckling is prevented. (For example, refer to Patent Document 1).

JP 2002-35848 A

  However, as described in Patent Document 1, when bending the H-shaped steel so that one flange is on the outer diameter side and the other flange is on the inner diameter side, it is pressed with a press roller d to form an H shape. When bending the steel a by pulling the flange e on the outer diameter side with a pinch roller to give a forced displacement, it is considered possible to prevent the buckling of the web h, but welding the web h and the flange There is a risk of breaking the part. In other words, in the case of H-shaped steel that is welded with 9% Ni steel as the web and flange material of the H-shaped steel and 70% Ni steel as the web and flange, the tensile strength of the molten material is weak. As a measure for preventing the buckling of the web as described in Patent Document 1, if a forced displacement is applied by pulling the flange on the outer diameter side of the bent H-shaped steel outward, the weld between the web and the flange is There is a problem of breaking. In addition, the web itself may break.

  Therefore, the present invention distributes the pressing load acting on the web when bending the H-shaped steel in the width direction of the web so that the web does not buckle and bends without breaking the welded portion of the flange. It is another object of the present invention to provide a bending apparatus for shaped steel that can be machined and that can be easily removed after bending for use in preventing buckling of the web.

  In order to solve the above-described problems, the present invention provides a pressing device that bends an H-shaped steel to be bent so that one flange is on the outer diameter side and the other flange is on the inner diameter side, and the H-shaped steel. It is configured to include a telescopic support structure that is interposed between flanges so as to sandwich a web at a position where steel is bent.

  In addition, the support structure in the above-described configuration is made into a single or a plurality of rods that can be expanded and contracted by a rotating body and screws, or as a hydraulic expansion / contraction member, according to a curved surface when H-shaped steel is bent. A support having a certain convex surface and a concave surface is provided at both ends.

  Furthermore, the support structure is attached to both ends of the central hydraulic expansion / contraction member with a press roller, and the press roller for positioning the H-shaped steel at the place where the pressing force is received is provided via the link member or the hydraulic expansion / contraction member. It is good also as what is connected with the hydraulic expansion-contraction member side of a part.

According to the bending apparatus for shape steel of the present invention, the following excellent effects can be obtained.
(1) A pressing device that bends the H-shaped steel to be bent so that one flange is on the outer diameter side and the other flange is on the inner diameter side, and a web at a position where the H-shaped steel is bent. Since it is configured to include a telescopic support structure that is interposed between the flanges so as to be sandwiched, the pressing load by the pressing device is dispersed by the supporting structure when the shape steel is bent by the pressing device. The load acting on the web can be reduced below the buckling load, and the web can be prevented from buckling and breaking without the need for tension by the conventional roller. It can be made unnecessary. Moreover, since the support structure is of a telescopic type, it can be easily inserted or removed between the flanges of the H-section steel.
(2) Dispersing the pressing load by the pressing device more reliably by using the support structure made of a telescopic type as a rod-shaped object and applying the pressing force toward the inner diameter side in the direction of the inner and outer diameters. This prevents web buckling and breakage.
(3) By using a support structure having a telescopic structure as a hydraulic telescopic member, attaching a support body having a convex surface and a concave surface matched to a curved surface when H-shaped steel is bent at both ends, and using a pressing load. It can be more effectively dispersed.
(4) By adopting a configuration using a plurality of press rollers as the support structure, it is possible to widely disperse the pressing load.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIGS. 1A and 1B show an embodiment of the present invention. For example, as used as a roof aggregate of an LNG tank, a long web 2 and two long flanges 3a, The straight H-section steel 1 that is assembled by welding with 3b is moved while being sequentially bent in the longitudinal direction by the apparatus of the present invention so as to have an arc shape having a required radius of curvature over the entire length. .

  In the drawings, for convenience of explanation, the H-section steel 1 is shown as a length when bending at one place.

  Also, the bending direction of the H-section steel 1 to be bent is a direction perpendicular to the web 2 and the H-section steel 1 is placed in a landscape orientation so that the flanges 3a and 3b are positioned vertically. It is shown as a case where bending deformation is given in the vertical direction.

  1 (a) and 1 (b), the shape steel bending apparatus of the present invention includes two pressing rollers 4, 5 and one pressing roller as pressing devices used when bending the H-section steel 1. 6 and a telescopic rod-like support structure that is used by being arranged along the web 2 between the flanges 3a and 3b at the position where the H-section steel 1 is bent, for example, a support structure that expands and contracts by a turnbuckle method It shall be provided with the thing 7.

  The support structure 7 that expands and contracts by the turnbuckle method includes rods 8 and 9 having a right screw 8a and a left screw 9a, and a rotating body 10 screwed to the screws 8a and 9a of the rod 8 and 9. The length can be adjusted by rotating the rotating body 10 to the right or left with respect to the rods 8 and 9.

  In addition, the two push rollers 4 and 5 disposed on the upper side which is the outer diameter side in the bending direction of the portion where the H-section steel 1 is to be bent have a required interval, that is, one bending deformation. It is arranged at intervals according to the region to be applied, and is supported by a drive device (not shown) so that it can be moved in the vertical direction to apply a pressing force or release the pressing force. Further, one push roller 6 disposed on the lower side which is the inner diameter side in the bending direction of the H-section steel 1 is disposed at an intermediate position between the two push rollers 4 and 5, and the two Like the pressing rollers 4 and 5, the structure is supported by a driving device (not shown) so that it can be moved in the vertical direction to apply a pressing force or release the pressing force.

  Since it is configured as described above, when bending the H-section steel 1, the two pressing rollers 4 on the outer diameter side as the pressing device 4 are placed at the position where the long H-section steel 1 is to be bent. 5 and one push roller 6 on the inner diameter side are set so that the outer surface of the flange 3a on the upper side of the H-shaped steel 1 placed in the lateral direction is in contact with the lower surface of the flange 3b on the lower side. .

  In this state, a plurality of telescopic support structures 7 are erected and arranged in the longitudinal direction of the H-section steel 1, and are arranged between the flanges 3a and 3b on both sides with the web 2 interposed therebetween as shown in the figure. At this time, each support structure 7 is attached by being rotated between the flanges 3a and 3b by appropriately rotating the rotating body 10 to adjust the height (length).

  In this state, the pressing rollers 4, 5 and 6 are driven in the pressing direction, and the respective rollers 4, 5, 6 are moved from the positions indicated by the solid lines to the positions indicated by the two-dot chain lines to apply the pressing force to the H-section steel 1. Like that. Thereby, the H-section steel 1 is in a straight line state indicated by a solid line by two points of pressing by the two pressing rollers 4 and 5 on the outer diameter side and one point of pressing by the one pressing roller 6 on the inner diameter side. To bend and deform into a state indicated by a two-dot chain line.

  When the H-section steel 1 is bent by the two rollers 4 and 5 on the outer diameter side and the one roller 6 on the inner diameter side, a pressing load acts on the web 2 to cause the web 2 to buckle. Therefore, conventionally, the flange 3a on the outer diameter side is pulled outward, but in the present invention, a plurality of telescopic support structures 7 are arranged side by side as shown in the drawing between the upper and lower flanges 3a, 3b. The H-section steel 1 is bent by the pressing rollers 4, 5 and 6 in the arranged state. Therefore, since the support structure 7 which is a telescopic type is interposed between the flanges 3a and 3b in the portion where the H-section steel 1 is bent, when the H-section steel 1 is bent by the inner side push roller 6 The plurality of support structures 7 are pressed while being in contact with the flange 3a on the outer diameter side, and the pressing load acting when the H-section steel 1 is bent can be dispersed by the support structure 7. become. As a result, the load generated on the web 2 can be reduced to a buckling load or less, and the web 2 can be prevented from buckling. At this time, since the flange 3a on the outer diameter side is not pushed or pulled outward, the welded portion between the flange 3a and the web 2 is not broken or the web 2 is not broken.

  When the bending process of the H-section steel 1 is completed as described above, each of the telescopic support structures 7 is shortened by rotating the rotating body 10 and removed from between the flanges 3a and 3b.

  When the bending of a part of the H-section steel 1 is completed as described above, the pressing rollers 4, 5, and 6 as the pressing devices are moved to the next bending position and set. In this case, if the H-section steel 1 can be moved, the H-section steel 1 is moved with respect to the rollers 4, 5, and 6 so as to match the bending position.

  At the next bending position of the H-section steel 1, similarly to the above, the support structures 7 that are extendable are arranged side by side between the flanges 3a and 3b, and the length is adjusted between the flanges 3a and 3b. It is attached by holding it between.

  Thereafter, the above operations are sequentially repeated so as to give a bending having a required radius of curvature over the entire length of the long H-section steel 1.

  In the above embodiment, each of the plurality of telescopic support structures 7 is arranged side by side and attached between the flanges 3a and 3b. However, the plurality of support structures 7 are connected in a row in a row. May be. This is advantageous because it is easy to handle and there is no risk of loss.

  Next, FIGS. 2 (a) and 2 (b) show another embodiment of the present invention. Similarly to the embodiment shown in FIGS. 1 (a) and 1 (b), the H-section steel 1 is removed. In a configuration in which bending is performed by the radial-side push rollers 4 and 5 and the inner-diameter side push roller 6, a plurality of extendable support structures 7 are interposed between the flanges 3a and 3b and the H-section steel 1 In place of the configuration in which the web 2 is prevented from buckling at the time of bending, a support structure 11 which is of a telescopic type and has a support attached to both ends is used.

  That is, a curved support body of a required size formed by bending a curved surface in accordance with a curvature for bending the H-section steel 1 at the tip of a rod 13 of a hydraulic cylinder or jack 12 as a hydraulic expansion / contraction member. 14 and a support structure 15 which is curved and molded in the same manner and attached to the end of the hydraulic cylinder or jack 12 on the head side so that the overall length can be adjusted. The object 11 is comprised.

  2 (a) and 2 (b), in order that the tip side of the rod 13 is directed to the outer diameter side when the H-section steel 1 is bent, the curved support 14 is arranged so that the convex portion is on the outside. The support 15 which is attached to the rod 13 and is curved is attached to the hydraulic cylinder or jack 12 so that the concave surface portion is on the outside.

  The support structure 11 having the above-described structure is prepared to be used one by one with the web 2 interposed therebetween. As shown in FIG. 2 (a), the support structure 11 is set up between the upper and lower flanges 3a and 3b at the position of the push roller 6 on the inner diameter side. The upper and lower supports 14 and 15 are held in contact with the inner surfaces of the flanges 3a and 3b. Next, the outer diameter side pressing rollers 4 and 5 and the inner diameter side pressing roller 6 are actuated to cause the H-section steel 1 to bend and deform.

  Also in this embodiment, when a bending load is applied to the H-section steel 1 and the H-section steel 1 is bent, the flange 3a, 3b of the H-section steel 1 pressed by the inner side push roller 6 is interposed. Since the hydraulic support structure 11 is interposed, when the H-section steel 1 is bent by the push roller 6 on the inner diameter side, the support structure 11 is connected to the outer diameter side. It will be pushed with the flange 3a in contact. As a result, the pressing load acting when the H-section steel 1 is bent can be dispersed by the support structure 11, the load generated on the web 2 can be reduced to the buckling load or less, and the web 2 is seated. You can avoid bending.

  Further, in this embodiment, the flange 3a on the outer diameter side of the bent H-section steel 1 is along the convex outer surface of the support 14 at the upper end of the support structure 11, On the other hand, the flange 3b on the inner diameter side of the bent H-section steel 1 is adapted to be along the concave outer surface of the support 15 at the lower end of the support structure 11. The pressing load when 1 is bent can be more effectively dispersed by the support structure 11.

  When the bending of the H-section steel 1 at a predetermined location is completed as described above, the support structure 11 is shortened and removed from between the flanges 3a and 3b and moved to the next bending position.

  FIG. 3 shows a modification of FIG. 2 (a) (b). In FIG. 2 (b) (b), the tip of the rod 13 of the hydraulic cylinder or jack 12 and the head side end of the hydraulic cylinder or jack 12 are shown. Although the curved supports 14 and 15 are fixed, the curved supports 14 and 15 are attached to the rod 13 and the hydraulic cylinder or jack 12 so as to be detachable by pins 16 respectively. The other configurations are the same as those shown in FIGS. 2A and 2B, and the same components are denoted by the same reference numerals.

  According to this example, there is an advantage that the curved support bodies 14 and 15 can be replaced when they are damaged, and the same effects as those of the embodiment shown in FIGS. Have.

  4 (a) and (b) show still another embodiment of the present invention. Similar to the embodiments of FIGS. 1 (a) and (b) and FIGS. 2 (a) and (b), The H-shaped steel 1 is bent by the two pressing rollers 4 and 5 arranged on the outer diameter side and the one pressing roller 6 arranged on the inner diameter side so that the web 2 at the bending position is sandwiched. In the structure which arrange | positions the support structures 7 and 11, the modification of the said support structure 11 is shown.

  That is, the press roller 17 is attached to the tip of the rod 13 of the hydraulic cylinder or jack 12 as a hydraulic expansion / contraction member, and the press roller 18 is attached to the head side end of the hydraulic cylinder or jack 12. Also, presser rollers 20 and 21 are respectively attached to the respective distal end portions of the link members 19a and 19b that are rotatably attached to the shaft of the presser roller 18 on the head side of the hydraulic cylinder or jack 12. And the other end side (inner end side) of the link members 22a and 22b which are rotatably attached to the shaft of the shaft 21 and the rod 13 of the jack 12 in the axial direction. It is provided and pivotally attached with a pin, or as shown in the figure, a cylindrical body 23 that can slide in the axial direction of the rod 13 is provided, and the cylindrical body 23 is pivotally attached to the cylindrical body 23 so as to be pivotable in the vertical direction. The inner ends of the link members 22a and 22b can be displaced along the rod 13 in the axial direction of the rod 13 when the center presser roller 18 and the presser rollers 20 and 21 at both ends are relatively displaced. It is obtained by a support structure 24 having the configuration.

  When the H-section steel 1 is bent, the support structure 24 having the above-described configuration is disposed symmetrically between the flanges 3a and 3b with the web 2 interposed therebetween. In this case, the presser rollers 20 and 21 are positioned at the press rollers 4 and 5 arranged on the outer diameter side when bending, and the presser rollers 17 and 18 in the center are pressed on the inner diameter side. It is positioned so as to be in contact with the flanges 3a and 3b to be pushed by the roller 6.

  When the H-section steel 1 is bent in the above state, there is a hydraulic cylinder or jack 12 that is pushed and bent by the push roller 6 as in the case of the above embodiment, and both sides of the hydraulic cylinder or jack 12 are bent. Since the pressing rollers 17 and 18 in contact with the flanges 3a and 3b are supported by the rod 13 via the link members 22a and 22b, the pressing load received when the H-section steel 1 is bent is a hydraulic cylinder. Alternatively, the pressing load can be dispersed from the web 2 by being received by the jack 12. Therefore, the load generated on the web 2 of the H-shaped steel 1 to be bent can be made equal to or less than the buckling load, and the web 2 is not buckled. At the same time, since the pressing rollers 20 and 21 can disperse the pressing load applied by the pressing rollers 4 and 5, buckling of the web 2 can be prevented in a wide range.

  When the bending of the H-section steel 1 is finished and the apparatus of the present invention is moved to the next bending position, the support structure 24 is removed from between the flanges 3a and 3b in the same manner as in the above embodiment. Move to the bending position.

  Further, FIG. 5 shows a modification of FIGS. 4 (a) and (b). A hydraulic damper 25 is attached to the link members 19a and 19b shown in FIGS. 4 (a) and (b), and the link member 19a and 19b can be freely displaced in the longitudinal direction so that it can follow the displacement of the presser rollers 20 and 21 when the H-section steel 1 is bent. Further, a hydraulic cylinder or jack 12 with a gauge is used so that it can cope with the case where the height of the H-section steel 1 is different. Other configurations are the same as those shown in FIGS. 4A and 4B, and the same components are denoted by the same reference numerals.

  In this case, the positions of the press rollers 20 and 21 can be adjusted, and the web 2 is pressed and the pressing load applied by the rollers 4 and 5 can be more effectively dispersed.

  The present invention is not limited to the above embodiments. For example, in FIGS. 1A and 1B, the case where a plurality of turnbuckle-type support structures 7 are used is shown. 2 may be used, and in FIGS. 2A and 2B and FIG. 3, curved plates are shown as the supports 14 and 15, but the support 14 is a block. Only one side of the block may be a convex object protruding in an arc shape, and the support 15 may be a concave object in which only one side of the block is recessed in an arc shape, and various modifications can be made without departing from the scope of the present invention. Of course.

BRIEF DESCRIPTION OF THE DRAWINGS The outline of one Embodiment of this invention is shown, (A) is a front view, (B) is the side view. BRIEF DESCRIPTION OF THE DRAWINGS The outline of the other form of implementation of this invention is shown, (A) is a front view, (B) is the side view. It is a schematic front view which shows the modification of FIG. BRIEF DESCRIPTION OF THE DRAWINGS The outline of the further another form of implementation of this invention is shown, (A) is a front view, (B) is the side view. It is a schematic front view which shows the modification of FIG. It is a front view of the bending apparatus of the conventional H-section steel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 H-section steel 2 Web 3a, 3b Flange 4 Push roller 5 Push roller 6 Push roller 7 Support structure 8a Right-hand thread (screw)
9a Left-hand thread (screw)
DESCRIPTION OF SYMBOLS 10 Rotating body 11 Support structure 12 Hydraulic cylinder or jack (hydraulic expansion-contraction member)
DESCRIPTION OF SYMBOLS 14 Support body 15 Support body 17 Pressing roller 18 Pressing roller 19a Link member 19b Link member 20 Pressing roller 21 Pressing roller

Claims (4)

  A pressing device that bends the H-shaped steel to be bent so that one flange is on the outer diameter side and the other flange is on the inner diameter side, and a web at the position where the H-shaped steel is bent is sandwiched. An apparatus for bending a shaped steel, comprising: a telescopic support structure interposed between flanges.   The shape steel bending apparatus according to claim 1, wherein the support structure that is extendable is a single or a plurality of rod-like objects that can be expanded and contracted by a rotating body and screws.   The steel structure according to claim 1, wherein the support structure having a telescopic structure is provided with a support body having a convex surface and a concave surface matched to a curved surface when the H-shaped steel is bent as a hydraulic expansion / contraction member at both ends. Bending machine.   The support structure made into the expansion-contraction type is attached to the both ends of the hydraulic expansion / contraction member at the center, and the press roller for positioning the H-shaped steel at the place where the pressing force is received via the link member or the hydraulic expansion / contraction member. 2. The shape steel bending apparatus according to claim 1, wherein the bending apparatus is connected to a hydraulic expansion / contraction member side in a central portion.

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