JP2019063849A - Shaped steel flange deformation correction jig - Google Patents

Abstract

To provide a jig which corrects partial deformation of a small-sized shaped steel flange in cold with a simple configuration while dealing with a reaction force which is generated by a load for correction without occurrence of deformation of a circumferential flange and taking into spring back into consideration, and a method for correction of partial deformation.SOLUTION: Provided is a shaped steel flange deformation correction jig 1 comprising: a jack 11; a fixation component 12 which has a sufficient rigidity applied to a flange 2a of a correction object; two fixation units 13 which fit the fixation component to a shaped steel flange at a position at which a partial deformation portion 2b of the shaped steel flange is sandwiched; two legs 14 which are fitted to the fixation component 12 at a position at which the partial deformation portion 2b is sandwiched; and a jack reaction force reception component 15 which is provided between two legs. A part 12a of the fixation component 12 corresponding to the partial deformation portion 2b is recessed, and two fixation units 13 sandwich the shaped steel flange 2a near the deformation portion 2b by faces parallel to the fixation component 12. A method for correcting the partial deformation portion 2b of the shaped steel flange by use of said correction jig is also provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a jig for correcting partial deformation of a flange of H-shaped steel or the like.

  In a construction site, a flange of a shaped steel may be accidentally overloaded and partially deformed. For example, there is a case where an unexpected load is applied to the flange of the H-shaped steel forming the gantry beam, and a partial deformation occurs as shown in the E part of FIG. In such a case, the deformed portion is usually heated by a gas burner and then a load is applied in the F direction for correction, but a site where the use of fire is prohibited, for example, a site where the target facility is an LNG vaporizer In this case, it is required to apply a load without heating, that is, to apply a load until the deformed flange is cold and has a stress exceeding the yield point of the material.

  In order to generate stress that is cold and exceeds the yield point of the material, it is a common practice to press a jack against the deformed portion and apply a load of the required size. In order to use a jack to apply a load that is cold and causes stress exceeding the yield point of the material, a jack fixing material having sufficient strength to receive the reaction force of the jack is required. On the other hand, in the case of the H-section steel used for the gantry beam, there is no problem in the case of the H-section steel which is fixed by itself with sufficient strength, but the H-section steel itself is firmly fixed If not, it is necessary to fix the shape itself. That is, in general, both the jack and the section steel having a deformed flange need a place to receive a reaction force.

  In addition, although the deformed portion F returns to the original state due to the load applied to correct the deformed portion, if the flange portion around the deformed portion F is deformed, further correction work is performed on that portion As it becomes necessary, deformation of the surrounding flange part must be avoided when loading the deformation part. Moreover, it is necessary to apply a load in consideration of the spring back accompanying plastic deformation.

  In the case where the deformed portion is heated and corrected, the coating of the heated portion is dropped and it is necessary to repaint over a wide area. With cold correction it is not necessary to have extensive repainting, even though it may require localized touch-up painting of the loaded area. Therefore, the correction of deformed parts in cold has the advantage of reducing working time and man-hours by eliminating the need for extensive repainting, so it is not limited to sites where the use of fire is prohibited, It is worthwhile to use in many places.

  We tried searching for prior application / previous patent or prior application / previous application model related to correction of deformation of flange of shape steel using patent / utility model text search of patent information platform, but many of the hits The present invention relates to an apparatus and method for correcting an error in the angle between the flange and the web which occurs when manufacturing a shaped steel by welding as in Patent Document 1, and corresponds to a partial deformation of the flange targeted by the present invention. I did not find anything to do. In addition, the device according to the invention or invention hit in this search is a large one that is itself incorporated into the production facility of shaped steel, and the partial deformation of the unexpected flange that occurs in the construction site intended by the present application is It is not suitable for use to say that it corrects.

JP, 2014-87815, A

None

  Therefore, the problem to be solved by the present invention is to easily cope with the reaction force generated on both the jack used for correction and the shaped steel having a deformed flange, and the load applied for correcting the deformed part around the deformed part Can be applied taking into account the springback associated with plastic deformation, and can also apply partial deformation of a small, shaped steel flange with a simple configuration. It is an object of the present invention to provide a jig for correcting between the two, and a method for cold correcting a partial deformation of a shaped steel flange using the jig.

Therefore, the present invention for solving the above problems is a jig for correcting partial deformation of a shaped steel flange using a jack,
Two jacks for securing the fixing member to the shaped steel flange at a position sandwiching a partially deformed portion of the shaped steel flange between the jack, a fixing member applied to the shaped steel flange to be corrected, and And two legs attached to the fixed member at a position sandwiching a partially deformed portion of the shaped steel flange therebetween, and a reaction force receiving member of the jack provided between the two legs. Consists of
The fixing member has sufficient rigidity, and a portion corresponding to a partially deformed portion of the steel flange of the surface applied to the steel flange is recessed.
The two fixing devices are provided close to both sides of a partially deformed portion of the shaped steel flange and fixed by sandwiching the shaped steel flange in a plane parallel to the fixing member. Have
A shaped steel flange deformation correction jig in which the jack can be installed between the deformed portion of the shaped steel flange and the reaction force receiving member, and the shaped steel flange using the shaped steel flange deformation correction jig Is a method of correcting a partially deformed portion of

  A fixing member having sufficient rigidity applied to a shape steel flange to be corrected, two legs attached to the fixing member at a position where a partially deformed portion of the shape steel flange is sandwiched therebetween, and 2 By integrating the reaction force receiving member of the jack provided between the legs of the book and installing the jack between the deformation portion of the steel flange and the reaction force receiving member, a load is applied to the deformation portion The reaction force of the jack is transmitted from the reaction force receiving member to the shaped steel flange through the two legs and the fixing member and is offset with the load applied to the shaped steel flange by the jack. Therefore, the reaction force is processed in the shaped steel flange deformation correction jig of the present invention, and no separate fixing material or fixing place is required. Even if the section steel is not firmly fixed, it is easy to carry out the correction work cold.

  The fixing member is attached to the shaped steel flange by two fixing devices provided at positions sandwiching the partially deformed portion of the shaped steel flange therebetween and in proximity to both sides of the deformed portion. The fixing device has a structure for fixing by sandwiching the steel flange in a plane parallel to the fixing member, so that the normal flange portion adjacent to the partially deformed portion has a sufficient rigidity. Hold firmly with you. Since the back of the partially deformed portion of the flange is integral with the web and has sufficient rigidity, the flange portion around the partially deformed portion can be deformed during the correction work of the steel plate flange deformation of the present invention The jig is kept flat and the load applied to correct the deformed portion does not deform the flange portion around the deformed portion.

  A portion of the surface of the fixing member applied to the shaped steel flange, which corresponds to a partially deformed portion of the shaped steel flange, is recessed. By determining the depth of the recess in consideration of the spring back accompanying the plastic deformation, the operation of repeatedly applying the load can be reduced and the correction work can be easily performed.

  Since the shape steel flange deformation correction jig of the present invention has a simple structure combining general purpose materials and is small, the shape steel flange is erroneously subjected to excessive load and partially deformed. It can be easily manufactured and used at the construction site.

  The shaped steel flange deformation correction jig of the present invention can process the reaction force generated in both the jack used for correction and the shaped steel having a deformed flange in the jig, and the partially deformed portion The load applied for correction does not cause deformation in the surrounding flange portion, and it can be applied taking into consideration springback accompanying plastic deformation, and with a simple configuration combining general-purpose materials, And since it is small, it can be easily manufactured and used at a construction site.

  Also, by using the shape steel flange deformation correction jig of the present invention, it is possible to easily apply a load that generates a stress that exceeds the yield point of the material in the cold, so even in the field where the use of fire is prohibited. It allows for corrective work and eliminates the need for extensive repainting operations that may be required after heating and corrective work.

  Furthermore, since it has a simple configuration combining general-purpose materials and is small, it can be easily manufactured in a short time in a construction site according to the situation, and a fixing material or the like that receives the reaction force of the jack There is no need to provide a separate fixing place, which facilitates preparation work, and additional correction work may occur because the load applied to correct the partial deformation does not cause deformation of the surrounding flange portion. Also, since the load can be applied taking into consideration the spring back accompanying plastic deformation, the operation of repetitive loading is reduced, and the entire correction work becomes easy.

BRIEF DESCRIPTION OF THE DRAWINGS It is whole explanatory drawing of Example 1 of the shaped steel flange deformation correction jig | tool of this invention. It is a front view. It is a side view. It is the BB sectional view. It is the top view and CC sectional drawing of the fixing plate of the fixing device. It is explanatory drawing which shows the figure before the correction | amendment of the flange corrected using the method of correcting the partial deformation part of the shaped steel flange of this invention. It is explanatory drawing of the partial deformation | transformation which arose by the unexpected load given to the flange of H type steel, and arose.

  Embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiment, and it goes without saying that various modifications may be added to the specific structure within the scope of the present invention.

  FIG. 1 is an entire explanatory view of a shaped steel flange deformation correction jig 1 according to a first embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a side view thereof. 4 is a cross-sectional view taken along the line B-B in FIG. 3, and FIG. 5 is a plan view and a cross-sectional view taken along the line C-C of the fixing plate of the fixing device. In addition, the cross-sectional view of a fixing device is shown to A part of FIG.

  The shaped steel flange deformation correction jig 1 sandwiches the jack 11, the fixing member 12 applied to the partially deformed portion 2b of the flange 2a of the shaped steel 2 to be corrected, and the partially deformed portion 2b therebetween. Two securing devices 13 for securing the securing member 12 to the shaped steel flange 2 in position, two legs 14 mounted on the securing member in a position sandwiching the partially deformed portion 2b of the shaped steel flange therebetween, It consists of the reaction force receiving member 15 of the jack provided between the two legs.

  The two fixing devices 13 provided close to both sides of the partially deformed portion 2b of the shaped steel flange are a fixing member 12 and a plane parallel thereto, that is, the upper surface 13ca of the pressing plate 13c of the fixing device. It has a structure which fixes by pinching the flange of the section steel 2 by. Further, the position of the reaction force receiving member 15 is determined in accordance with the height of the jack 11, and the dimension is such that the jack 11 can be installed between the deformed portion 2b of the shaped steel flange and the reaction force receiving member 15. .

  The fixing member 12, the two legs 14, and the reaction force receiving member 15 of the jack provided between the two legs 14 are integrated, and the deformed portion 2b of the shaped steel flange and the reaction force receiving member 15 are integrated. By installing the jack 11 between them, the reaction force of the jack 11 when a load is applied to the deformed portion is transmitted from the reaction force receiving member 15 to the shaped steel flange 2a via the two legs 14 and the fixing member 12. And offset by the jack 11 with the load applied to the shaped steel flange 2a. Therefore, the treatment of the reaction force is performed in the shaped steel flange deformation correction jig 1 of the present invention, and there is no need for a separate fixing material or a fixing place which receives the reaction force. Even if the shape steel is not firmly fixed, it is possible to apply a load of a necessary and sufficient size, and it is possible to carry out the correction work cold and easily.

  The fixing device 13 of this embodiment comprises a high nut 13a attached to the projection 14a of the leg 14 by welding, a bolt 13b engaged therewith, and a pressing plate 13c. The pressing plate 13c has a flat upper surface 13ca and has a hole 13cb in which the tip end of the bolt 13b is fitted.

  When attaching the shaped steel flange deformation correction jig 1 to the shaped steel flange 2a, the recessed portion 12a of the fixing member 12 is applied so as to straddle the partially deformed portion 2b of the shaped steel flange. In a state where the tip end of 13b is inserted into the hole 13cb, the bolt 13b is tightened, and the pressing plate 13c is pressed against the lower surface of the flange 2a to be firmly fixed. By providing the hole 13ca into which the end of the bolt 13b is inserted, the fixing of the shaped steel flange deformation correction jig 1 to the flange 2a can be performed easily and quickly.

  Since the two fixing devices 13 are provided at positions sandwiching the partially deformed portion 2b of the shaped steel flange therebetween and located on both sides of the deformed portion respectively, the pressing plate 13c holds firmly the normal flange portion adjacent to the partially deformed portion 2b of the shaped steel flange together with the fixing member 12 with sufficient rigidity. Since the back of the partially deformed portion 2b of the flange is integral with the web 2c and has sufficient rigidity, the flange portion around the partially deformed portion 2b is kept flat during the correction work, The load applied to correct the deformed portion does not deform the flange portion around the deformed portion.

  In addition, although the fixing device 13 of Example 1 takes the structure attached to the protrusion part 14a of the leg 14 by welding, it does not necessarily need to be attached to the leg 14. FIG. That is, the legs may be attached separately to the fixing member 12 by the legs, and the fixing device may be separately attached to a member extended from the fixing member. Further, the configuration of the fixing device is not limited to the combination of the high nut 13a, the bolt 13b engaged therewith, and the pressing plate 13c, and a plate member having a flat upper surface corresponding to the pressing plate 13c is used as a flange. Various configurations may be considered such as sandwiching and arranging the fixing member 12 so as to face the fixing member 12 and tightening the plate member and the fixing member with a vise or the like.

  Also, the fixing member 12 has sufficient rigidity, and the portion 12a corresponding to the partially deformed portion 2b of the shaped steel flange of the surface applied to the shaped steel flange is recessed in accordance with the assumed amount of spring back It is molded into a cuboid shape. Therefore, when operating the jack 11, by pushing in with the jack in consideration of the amount of springback assumed in advance, it is possible to reduce the operation of repeatedly applying the load.

  As can be understood from the above description, the shape steel flange deformation correction jig 1 of the present embodiment is simple in construction and small in size, and combines a commercially available jack and general-purpose materials such as plate material, shape steel, bolt, and nut. Thus, for example, an unexpected load is applied to the flange of the H-shaped steel constituting the gantry beam, and the flange can be easily manufactured and used in a construction site where a partial deformation has occurred.

  Next, a method of correcting a partially deformed portion of the shaped steel flange using the shaped steel flange deformation correction jig of the present invention will be described. The description will be made on the case of using the shape steel flange deformation correction jig 1 of Example 1, but using the shape steel flange deformation correction jig in which various modifications are made to the specific structure within the scope of the present invention. There is basically no change.

  As described above, a commercially available jack is combined with a general-purpose material such as a plate, a shaped steel, a bolt, a nut or the like to produce a shaped steel flange deformation correction jig 1. At this time, the length of the fixing member 12 and the dimension of the recessed portion 12a thereof are determined in accordance with the size of the deformed portion E of the partially formed flange of FIG. In addition, the stress and temperature exceeding the yield point of the material in a cold state are obtained from the material and dimensions of the flange 2, and the width and height of the fixing member 12 are determined so as to have rigidity to withstand the corresponding load. Similarly, the fixing device 13, the legs 14, and the reaction force receiving member 15 are designed to bear the load.

  This jig is simple in construction, small in size, and can be manufactured by combining commercially available jacks and general-purpose materials such as plate materials, shaped steels, bolts, and nuts. It can be easily manufactured and used in a construction site where an unexpected load is applied to cause partial deformation.

  As shown in FIG. 1, the shaped steel flange deformation correction jig 1 is installed on the deformed portion E of the flange, and the preparation work is completed. After that, the jack 11 is activated to apply a load. The stroke of the piston of the jack is determined according to the amount of springback assumed.

  FIG. 6 is an explanatory view showing a front view of the flange to be corrected using the method for correcting a partially deformed portion of the shaped steel flange of the present invention.

  The dimensions of this H-section steel are H = 250 mm, W = 125 mm, web thickness w = 6 mm, flange thickness h = 9 mm. The dimensions of the portion deformed by receiving an unexpected load were length a = 130 mm, depth b = 40 mm, and displacement amount c of central portion of deformation c = 5.5 mm.

  As a result of the correction using the method of correcting the partially deformed portion of the shaped steel flange of the present invention, the value of the displacement amount c was within 0.5 mm, and sufficient correction was performed.

  By adopting the method of correcting the partial deformation of the shaped steel flange by cold according to the present invention, it is possible to perform the correction work even at the site where the use of fire is prohibited, and extensive repainting after the correction work No work is required.

  In addition, there is no need to separately provide a fixing material or a fixing place for receiving the reaction force of the jack, so the preparation work is facilitated, and the load applied to correct the partially deformed portion causes the surrounding flange portion to be deformed. There is no need for additional correction work, and springback due to plastic deformation can also be taken into consideration to reduce the number of repeated loading operations and to facilitate correction work.

DESCRIPTION OF SYMBOLS 1 Shape steel flange deformation correction jig of the present invention of Example 1 2 Shape steel 2a Flange of shape steel 2b Partially deformed portion 2c Web of shape steel 2 11 Jack 12 Fixing member 12a Recessed shape of fixing member Part 13 Fixing device 13a High nut 13b Bolt 13c Pressing plate 13ca Its upper surface 14 Leg 14a Leg protrusion 15 Reaction force receiving member E Partially deformed part of flange a Length b same depth c same displacement of central part H H-shaped steel height W same width h same flange thickness w same web thickness

Claims (2)

A jig for correcting a partial deformation of a shaped steel flange using a jack,
Two jacks for securing the fixing member to the shaped steel flange at a position sandwiching a partially deformed portion of the shaped steel flange between the jack, a fixing member applied to the shaped steel flange to be corrected, and And two legs attached to the fixed member at a position sandwiching a partially deformed portion of the shaped steel flange therebetween, and a reaction force receiving member of the jack provided between the two legs. Consists of
The fixing member has sufficient rigidity, and a portion corresponding to a partially deformed portion of the steel flange of the surface applied to the steel flange is recessed.
The two fixing devices are provided close to both sides of a partially deformed portion of the shaped steel flange, and have a structure for fixing by sandwiching the shaped steel flange in a plane parallel to the fixing member. A shaped steel flange deformation correction jig wherein the jack can be installed between the deformed portion of the shaped steel flange and the reaction force receiving member.   A method of correcting a partially deformed portion of a shaped steel flange using the shaped steel flange deformation correction jig according to claim 1.

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