JP4924125B2 - Steel sheet pile straightening method and steel sheet pile straightening device - Google Patents

Description

  The present invention relates to a steel sheet pile correction method and a steel sheet pile correction device, and more particularly to a steel sheet pile correction method and a steel sheet pile correction device that can suitably correct the bending and warping of a hat-shaped steel sheet pile.

  The steel sheet pile is mainly used for civil engineering, and as this kind of steel sheet pile, for example, a hat-shaped steel sheet pile 50 illustrated in FIG. In this type, a hat (hat) shape is formed by providing flange portions 52 so as to project toward one of the vertical directions. Each flange portion 52 is provided with an arm portion 54 projecting from the tip to the left and right. Each arm portion 54 is provided with a joint portion 53 at its tip, and serves as a joint support portion for supporting the joint portion 53. In addition, the joint part 53 of both ends makes a pair at right and left, and can mutually engage with the joint part 53 of the other adjacent hat-shaped steel sheet pile.

Here, the manufacturing process of a general hat-shaped steel sheet pile will be described with reference to FIG.
As shown in the figure, when manufacturing a hat-shaped steel sheet pile, first, it is hot-rolled to a hat-shaped cross-sectional shape necessary for the hat-shaped steel sheet pile with a hot rolling mill (S101). Next, the formed hat-shaped steel sheet pile is cut into a predetermined product length by a hot saw machine (S102), and then cooled to room temperature on a cooling bed (S103).

  By the way, when this type of hat-shaped steel sheet pile is hot-rolled, the rolling condition on the top, bottom, left and right is unbalanced, or due to temperature deviation in the cross section at the end of rolling, for example, as shown in FIG. With reference to the longitudinal direction, shape defects such as a “bend” that bends in the left-right direction as shown in FIG. 5A and a “warp” that bends in the up-down direction as shown in FIG. . In particular, a steel sheet pile having a hat shape is characterized by large bending and warping at the end of the product.

  Therefore, in the manufacturing process of a general hat-shaped steel sheet pile, after the cooling, the “warp” in the vertical direction is corrected using a leveler straightening machine in which upper and lower rolls are alternately arranged (S104), and then the inspection floor The size and shape are inspected at (S105). As a result of this inspection, if the above-mentioned bend, warp, etc. are larger than the tolerance, they are further sent to the pressing process to perform press correction (S106). In particular, warping at the end in the longitudinal direction is difficult to correct with a leveler straightening machine because it is difficult to secure a support allowance, and usually the end is press-corrected after leveler correction.

  Also, “curvature” in the left-right direction is often corrected by a press because the correction load is relatively large. For example, in the technique described in Patent Document 1, this type of press correction method is not possible. It is disclosed. In the correction method disclosed in this document, a jig having a predetermined shape is used, and correction of bending is repeatedly performed while feeding a hat-shaped steel sheet pile at a predetermined pitch. Thereby, while keeping the width | variety of a hat-shaped steel sheet pile constant, the dent of a flange part is prevented and the correction | amendment of the bending of a hat-shaped steel sheet pile is enabled.

Further, as another method for correcting the bending, for example, in Patent Document 2, the arm portion (joint support portion) on which the bending is the outward bending (the side on which the bending is generated) is rolled down by the upper and lower rolls (rollers), and the longitudinal direction is increased. A technique for correcting bending by extending in a direction is disclosed.
JP 09-182916 A JP 2005-279657 A

  However, in the method disclosed in Patent Document 1, since a jig having a predetermined shape is used for press correction, the shape of the jig is matched with the shape of a hat-shaped steel sheet pile having a difference in dimensions for each product. It is necessary to adjust to a predetermined shape. In addition, since it is necessary to repeatedly correct the bend while feeding the hat-shaped steel sheet pile at a predetermined pitch, it takes much time to correct the bend. Furthermore, in press correction, three-point support is required, but since the support margin cannot be secured sufficiently at the end of the hat-shaped steel sheet pile, it is very difficult to correct the bending at the end.

  On the other hand, the correction method disclosed in Patent Document 2 is an excellent correction method capable of correcting the bend to the end of the product because it is rolled down by the upper and lower rolls. However, although this straightening method is suitable for straightening the bend, how to straighten the hat-shaped steel sheet pile that is warped along with the bend, or by correcting the bend There remains a problem with how to correct (suppress).

  Therefore, the present invention has been made paying attention to such problems, and provides a steel sheet pile correction method and a steel sheet pile correction device capable of correcting both bending and warping of a steel sheet pile. It is an object.

In order to solve the above-mentioned problems, the present inventors first performed a correction experiment on the bending of a hat-shaped steel sheet pile based on the correction method disclosed in Patent Document 2 prior to the present invention. FIG. 5 shows the bending correction apparatus used in the experiment. In addition, about the structure similar to the hat-shaped steel sheet pile demonstrated above, the same code | symbol is attached | subjected and demonstrated.
As shown in the figure, the bending straightening device 101 has a pair of lower rolls 103a and 103b for lowering on the lower sides of the left and right arm portions 54, respectively, A pair of down-rolling upper rolls 104a and 104b are arranged facing the lower rolls 103a and 103b, respectively. The lower rolls 103a and 103b for reduction support the left and right arm portions 54 of the hat-shaped steel sheet pile 50 from below, and also support the lower portions of the left and right flange portions 52 to the middle along the inner slope. In addition, the pair of upper rolls 104a and 104b for reduction can individually reduce the left and right arm portions 54 from above the lower rolls 103a and 103b for reduction.

  In this straightening experiment, using the bending straightening device 101, one arm portion 54 of the hat-shaped steel sheet pile 50 was subjected to rolling reduction, and the change in shape due to the straightening was investigated. Here, the hat-shaped steel sheet pile 50 used for the straightening experiment was a material having almost no bending and warping in order to investigate the change before and after the straightening. The hat-shaped steel sheet pile 50 has a product length 10 m in the longitudinal direction, an effective width W = 900 mm, an effective height H = 230 mm, a web thickness T1 = 10.8 mm, a flange thickness T2 = 8 mm, and an arm. A part having a thickness T3 = 10.0 mm was used (see FIG. 2).

  FIG. 6 shows an example of a change in the bending and warping shape of the joint portion 53 from the arm portion 54 by this correction experiment. In addition, the same figure (a) shows the bending shape when the hat-shaped steel sheet pile 50 is seen from upper direction about the joint part 53 of each holding side which is the side which did not perform reduction on the reduction side. Show. Moreover, the figure (b) has shown the shape of the curvature of the joint part 53 of each reduction side and holding | maintenance side when the hat-shaped steel sheet pile 50 is seen from the side.

  As can be seen from FIG. 5A, after this straightening experiment, the reducing joint 53 is bent inward (web side), and the holding joint 53 is outward (opposite to the web). It is bent. Therefore, in actual correction, it was confirmed that the bending can be corrected by reducing the arm portion 54 on the side that is bent outward. It was also confirmed that the bending portion 53 had a large change in bending at both ends in the longitudinal direction.

  On the other hand, as to the shape of the warp after the correction experiment, as shown in FIG. 5B, the joint part 53 on the reduction side is in a downward warp form as a whole, and the joint part 53 on the holding side is in an upward warp form as a whole. It was confirmed that the phenomenon of In particular, it was also confirmed that the warping at the both ends in the longitudinal direction on the reduction side was large. From this result, it was found that it is necessary to further correct the warp after the bending correction under the pressure by the bending correction apparatus 101.

Therefore, in order to correct this warp, a warp correction device 201 for correcting the warp was manufactured as schematically shown in FIG. In addition, the figure (a) is a front view of the curvature correction apparatus 201, and the figure (b) is the side view.
The warp correction device 201 includes a pair of upper pressing rolls 202a and 202b on the upper side of each arm portion 54 of the hat-shaped steel sheet pile 50 as shown in FIG. And as shown in the figure (b), these pairs of upper rolls 202a and 202b for a press are spaced apart in the conveyance direction of the hat-shaped steel sheet pile 50, and two pairs of the same structures are arrange | positioned. Further, a pair of lower pressing rolls 203a and 203b are respectively arranged below the arm portions 54, as shown in FIG. 4A, and the pair of lower pressing rolls 203a and 203b are arranged in the same figure. As shown in (b), three pairs of the same configuration are arranged apart from each other in the conveying direction of the hat-shaped steel sheet pile 50.

  And these five pairs of pressing rolls are, as shown in FIG. 5B, the upper pressing upper rolls 202a and 202b and the lower pressing lower rolls 203a and 203b are made of the hat-shaped steel sheet pile 50. They are moved back and forth in the transport direction, and are alternately arranged at the top and bottom. The five pairs of pressing rolls arranged alternately can press the arm portions 54 alternately in the vertical direction so as to correct the warp applied from the arm portions 54 to the joint portions 53. As a result of a warp correction experiment of the hat-shaped steel sheet pile 50 using the warp correction device 201, it was confirmed that the warp of the arm portion 54 and the like generated after the bend correction by the bend correction device 101 can be corrected (first). Called knowledge).

  By the way, when examining the shape of a normal hot-rolled hat-shaped steel sheet pile, it has been found that many of them are outwardly bent and warped at both ends in the longitudinal direction. FIG. 8 schematically shows the end shape. The figure is a typical outward bending and warping form when manufactured by normal hot rolling, (a) is a plan view showing the state of outward bending, and (b) shows the state of upward warping. It is a side view. On the other hand, FIG. 9 shows a form of inward bending and downward warping, where (a) shows the state of internal bending and (b) shows the state of downward bending.

  Here, using the bending correction apparatus 101, the change in the shape when only the vicinity of the ends of both arm portions 54 was corrected by reducing both the left and right at the same time was investigated. In addition, the hat-shaped steel sheet pile 50 used for the straightening experiment was also used in the same manner as described above in order to investigate changes before and after the straightening, with little bending and warping. As a result, it was found that after the correction, the shape changed to an inward bending and downward warping form shown in FIG. From this finding, it is possible to correct both the bending and the warping by simultaneously reducing both the left and right arms and correcting the outward bending and warping as shown in FIG. I also found (called second knowledge).

The present invention has been made based on the above findings and further studies.
That is, the first invention of the present invention is a web portion extending in the left-right direction, a flange portion projecting from the both ends of the web portion toward one of the vertical directions, and an arm projecting left and right from the tip of each flange portion. A steel sheet pile having a portion and a joint portion provided at the tip of each arm portion, the bending correction step of correcting the bending in the left-right direction of the steel sheet pile, and the upper and lower sides of the steel sheet pile A warp correction step of correcting a warp in a direction, and the bending correction step is to reduce the arm portion of the arm portion by at least one pair of rolling rolls facing each other vertically. And the said curvature correction process presses the said arm part with the 3 or more press roll alternately arrange | positioned up and down in the conveyance direction downstream from the said one set of reduction roll, It is characterized by the above-mentioned.

  According to the first aspect of the invention, at least the arm portion of the arm portion whose bending direction is the outward bending is squeezed by the pair of squeezing rolls, so that the bending can be corrected. And, in the warp correction process, since the arm portion is pressed by three or more pressing rolls arranged alternately on the downstream side and up and down from the set of rolling rolls, according to the first knowledge, It is possible to correct the warpage generated in the bending correction process.

  Here, in the correction method of the steel sheet pile according to the first invention, it is preferable to adjust the degree of pressing by the pressing roll in the warp correction process according to the degree of reduction in the bending correction process. In such a configuration, for example, a test or simulation is performed in advance on the correlation between the bending state of the steel sheet pile and the amount of reduction according to the state of bending, and the degree of warpage according to the amount of reduction in the bending correction process. If the degree of pressing by the pressing roll necessary to correct the warp according to the amount of reduction is previously obtained as table data, and the table data is referred to as appropriate, the optimum degree according to the degree of reduction is obtained. The degree of pressing by the pressing roll can be selected. Therefore, it is more suitable for correcting both the bending and warping of the steel sheet piles to fall within the desired tolerance.

  In addition, the second invention of the present invention includes a web portion extending in the left-right direction, a flange portion projecting from the both ends of the web portion toward one of the upper and lower directions, and an arm projecting left and right from the tip of each flange portion. Is a method of correcting a steel sheet pile having a joint portion and a joint portion provided at the tip of each arm, respectively, a correction form determination step for determining the form to be corrected of the steel sheet pile, and the left and right of the steel sheet pile Whether or not the bending and the warp have occurred at the end in the longitudinal direction of the steel sheet pile in the correction form determining step. In the correction step, the arm portion is vertically opposed to the arm portion for which it is determined that the bending of the end portion in the longitudinal direction of the steel sheet pile is outward bending and the warping is upward. Reduce with a pair of reduction rolls It is characterized in that.

According to the second invention, in the correction form determination step, it is determined whether the end portion of the arm portion of the steel sheet pile is bent and warped, and in the correction step, the arm portion is opposed to each other vertically. Therefore, the bending and warping can be corrected simultaneously by the second finding.
The third aspect of the present invention includes a web portion extending in the left-right direction, a flange portion projecting from the both ends of the web portion toward one of the vertical directions, and an arm projecting left and right from the tip of each flange portion. A correction device used to correct a steel sheet pile having a portion and a joint portion provided at the tip of each arm portion, and a bending correction means for correcting the bending in the left-right direction of the steel sheet pile, A warp correction means for correcting the warp in the vertical direction of the steel sheet pile, and the bending correction means has a set of reduction rolls that can be rolled down by sandwiching the arm portion of the steel sheet pile from above and below, The warp correcting means is characterized in that it has three or more pressing rolls that are arranged on the downstream side of the bend correcting means and are alternately arranged vertically in the transport direction so as to be able to press the arm part.

  According to 3rd invention, the correction apparatus suitable for the correction method of the steel sheet pile concerning the said 1st thru | or 2nd invention can be provided. That is, according to the steel sheet pile correction device according to the third aspect of the invention, since the pair of reduction rolls is provided as the bending correction means, it is possible to reduce, for example, an arm portion that is an outward bend among the arm portions. Therefore, the bending can be corrected. And since it has three or more press rolls downstream as a curvature correction means as a curvature correction means, the arm part which corrected the said curvature can be further pressed, for example. Therefore, the warp generated when correcting the bending can be corrected by the first knowledge.

  Here, in the straightening device for a hat-shaped steel sheet pile according to the third invention, one of the set of rolling rolls constituting the bending straightening means is one of three or more pressing rolls constituting the warping straightening means. It is preferable that it is configured to serve also as a pressing roll located on the most upstream side. If it is such a structure, since one of the rolls which comprises the correction apparatus for hat-shaped steel sheet piles concerning 3rd invention can be abbreviate | omitted, a structure can be simplified and the cost of an apparatus can be held down.

  As described above, according to the present invention, it is possible to provide a steel sheet pile correction method and a steel sheet pile correction device that can correct both the bending and warping of the steel sheet pile.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. In addition, the same code | symbol is attached | subjected and demonstrated about the structure similar to what was illustrated with reference to the said FIG. 2 thru | or FIG.
FIG. 1: is a schematic block diagram for demonstrating one Embodiment of the correction apparatus for steel sheet piles and the correction method of a steel sheet pile which concerns on this invention, The figure (a) is a front view of the correction apparatus (the figure ( FIG. 5B is a side view of the correction device, and FIG. 10C is a cross-sectional view taken along the line BB in FIG. In addition, in the same figure (b), except each structure, only each roll and steel sheet pile are shown in figure.

  As shown in FIG. 1, the steel sheet pile to be corrected by the steel sheet pile correction device 1 (hereinafter, also simply referred to as “correction device”) is a hat-shaped steel sheet pile, and the hat-shaped steel sheet pile 50 is laterally centered. The web portion 51 extends, and flanges 52 are provided at both ends thereof so as to project toward one of the vertical directions (downward in the figure), thereby forming a hat shape. The hat-shaped steel sheet pile 50 is transported by a table roll (not shown) and can be inserted into a predetermined position of the correction device 1.

Here, the correction device 1 includes a bending correction unit that corrects the bending of the hat-shaped steel sheet pile 50 in the left-right direction, a warp correction unit that corrects the warping of the hat-shaped steel sheet pile 50 in the vertical direction, and the correction device 1. Position detecting means capable of detecting the position of each portion of the hat-shaped steel sheet pile 50 inserted at a predetermined position.
First, the bending correction means will be described.

As shown in FIG. 2B, the bending correction means includes a pair of rolling rolls 3 and 4 that can be rolled down by sandwiching the arm portion 54 of the hat-shaped steel sheet pile 50 from above and below.
As shown in FIG. 2A, the pair of rolling rolls 3 and 4 is provided on the upper side of the pair of left and right lowering rolls 3a and 3b disposed on the lower side of each arm portion 54 and on the upper side of the arm portion 54. And a pair of upper rolls 4a, 4b for reduction disposed opposite to the respective lower rolls 3a, 3b for reduction. The right and left lower rolls 3a and 3b for reduction are provided coaxially with respect to the lower roll support shaft 2, and are arranged on both sides thereof by a predetermined distance apart. The lower rolls 3a and 3b for reduction support the left and right arm portions 54 of the hat-shaped steel sheet pile 50 from below, and also support the lower portions of the left and right flange portions 52 to the middle along the inner slope. . And both ends of the lower roll spindle 2 are rotatably supported by the lower roll chock 5, respectively. Furthermore, one end 2a (the right side in the figure) of the lower roll spindle 2 protrudes to the opposite side of the one lower roll chock 5, and the protruding end 2a is driven via the speed reducer 7. It is connected to the output shaft 6 a of the motor 6.

  On the other hand, the upper rolls 4a and 4b for reduction are provided at the tip of an upper roll spindle 14 which is a spindle for individually supporting the upper rolls 4a and 4b for reduction. The upper roll chock 8 is supported so as to be rotatable around its axis. Each upper roll chock 8 is attached to a housing 15 provided at an upper portion via hydraulic cylinders 9a and 9b, and adjusts the pressure oil supplied to each hydraulic cylinder 9a and 9b. By individually driving 9a and 9b, the pressure of each of the left and right arm portions 54 and the amount of the reduction can be set individually on the left and right. Note that the left and right upper rolls 4a and 4b do not have a rotational drive unit such as the drive motor 6 but rotate as the hat-shaped steel sheet pile 50 is transported.

Next, warp correction means will be described.
As shown in FIG. 2B, the warp correction means is disposed on the downstream side of the pair of rolling rolls 3 and 4 constituting the bending correction means, and the arm portion 54 can be pressed. It is configured to have three or more (four in this example) pressing rolls 10, 11, 12, and 13 that are alternately arranged up and down in the transport direction.

  The plurality of pressing rolls 10, 11, 12, 13 are a set of rolling rolls as shown in FIG. 3C, except that the upper and lower rolls are alternately arranged in the conveying direction. This is the same as the configuration of 3 and 4. That is, the pressing rolls 11 and 13 disposed below the arm portion 54 are configured to include a pair of left and right pressing lower rolls 11a and 11b and pressing lower rolls 13a and 13b, respectively. The pressing rolls 10 and 12 arranged on the upper side of the portion 54 are configured to include a pair of left and right pressing upper rolls 10a and 10b and pressing upper rolls 12a and 12b, respectively. The pressing rolls 11 and 13 can be individually driven by the drive motor 6 via the speed reducer 7 as described above, and the hydraulic cylinders 9a and 9b are also applied to the pressing rolls 10 and 12 in the same manner as described above. Are individually driven, so that the pressure of each press and the amount of the press can be set individually on the left and right. In the warp correction by the warp correction means, the positions of the roll peripheral surfaces of the upper pressing rolls 10 and 12 relative to the lower pressing rolls 11 and 13 are considered in consideration of the thickness of the arm portion 54. (In this embodiment, when the arm portion 54 is not warped, that is, in a straight state, the amount of reduction (or pressing amount) at the roll position where the upper surface of the arm portion 54 is touched) Is defined as 0 mm).

Next, position detection means will be described.
The position detection means includes a plurality of position sensors 22 which are vertical position detection means capable of detecting the vertical position of the hat-shaped steel sheet pile 50 inserted at a predetermined position, and the hat-shaped steel inserted at a predetermined position. And a plurality of displacement sensors 24 which are left and right position detecting means capable of detecting the position of the sheet pile 50 in the left and right direction.

As shown in FIG. 2B, the position sensor 22 is mounted on each of the hydraulic cylinders 9a and 9b so as to detect the amount of movement in the direction facing the hat-shaped steel sheet pile 50, respectively. The amount of movement in the facing direction detected by each position sensor 22 is sent to the control unit 20 through the signal line as information on the vertical position.
Moreover, the displacement sensor 24 is respectively installed in the position which opposes both the joint parts 53 on the right and left as shown to (a) in the figure, These several displacement sensors 24 are with respect to the position used as a reference | standard. The position of the joint portion 53 in the left-right direction can be detected, and information on the left-right position detected by each displacement sensor 24 is also sent to the control unit 20 via a signal line.

And the control part 20 is comprised from a micro processing unit (MPU) etc., for example, starts the predetermined program stored in the predetermined area | region of ROM, and corrects the bending and curvature of a hat-shaped steel sheet pile according to the program. While performing the process which concerns, this can be controlled, monitoring the driving | running state of the correction apparatus 1 whole.
Here, the process related to the correction of the bending and warping includes a correction form determining process for determining the form to be corrected of the hat-shaped steel sheet pile, and a correction process necessary for correcting the bending and the warping. The correction form determination processing is based on the information on the vertical position detected by the position sensor 22 provided for each of the hydraulic cylinders 9a and 9b and the information on the horizontal position detected by each displacement sensor 24. The state of bending and warping of the hat-shaped steel sheet pile 50 is determined. Further, the correction process refers to a preset data table with respect to the hat-shaped steel sheet pile 50 that has been determined to be bent and warped in the correction form determination process, and has the determined hat-shaped steel sheet pile 50 has. By setting the conditions of reduction or pressing suitable for correction of bending and warping, and controlling each hydraulic cylinder 9a, 9b under the set conditions, it is possible to correct the bending and warping so as to be within a predetermined tolerance. It has become.

Specifically, when the hat-shaped steel sheet pile 50 is conveyed by a table roll or the like and inserted into a predetermined position of the correction device 1, the control unit 20 includes the correction form among the processes related to correction of bending and warping. Judgment processing is executed.
In the correction form determination process, first, the left and right positions of the joint portion 53 with respect to the reference position are detected by the plurality of displacement sensors 24, and information on the detected left and right positions is sent to the control unit 20. Further, after the hat-shaped steel sheet pile 50 is transported to a predetermined position, the hydraulic cylinders 9a and 9b are preliminarily driven at a low pressure, and the left and right arm portions 54 of the hat-shaped steel sheet pile 50 are used for reduction and pressing. The upper rolls 4, 10, 12 move to positions where they abut. Note that the force of the pressure oil at this time is set to a weak force that does not reduce or press for correction. Thereby, the position in the up-and-down direction where each upper roll 4, 10, and 12 contact | abutted to the hat-shaped steel sheet pile 50 is specified, and the position sensor 7 of each hydraulic cylinder 9a, 9b respond | corresponds to this. Each position is detected, and information on the detected vertical position is sent to the control unit 20.

  Next, in the correction form determination process, the state of bending and warping in the initial state of the hat-shaped steel sheet pile 50 is determined from the mutual relationship based on the information on the vertical position and the information on the horizontal position from the plurality of sensors. To do. This determination is made by referring to the correction table determination data table in which the correlation between the vertical position information and the horizontal position information and the state of bending and warping is set in advance, and the vertical position information detected by each sensor and The state of bending and warping is determined according to the information on the left and right positions (correction form determination step). Note that the correlation between the vertical position information and the horizontal position information of the hat-shaped steel sheet pile 50 and the state of bending and warping has been obtained in advance through tests or simulations, and this is the table data for determining the correction form described above. Is stored in a predetermined area of the ROM in the control unit 20.

Next, in the control unit 20, a correction process is executed.
In the correction process, a condition of reduction or pressing suitable for correcting the bending and warping of the hat-shaped steel sheet pile 50 determined in the correction form determination process described above is selected from the data table for correction process, and the selected condition Thus, a process for controlling the amount of pressing or pressing of each hydraulic cylinder 9a, 9b is executed, thereby enabling a desired correction in which bending and warping are within a predetermined tolerance (correction process). Note that the correlation between the bent state of the hat-shaped steel sheet pile 50 and the amount of reduction according to the bent state, etc., is set in advance through tests or simulations, like the table data for determining the correction form. . For example, the degree of warping according to the amount of reduction in the bending correction process is obtained, and the degree of pressing by the pressing roll necessary to correct the warping according to the amount of reduction is acquired in advance as table data for correction processing. Then, it is stored in a predetermined area of the ROM in the control unit 20.

  Here, the straightening process includes a bending straightening process for straightening the bending of the hat-shaped steel sheet pile 50 in the left-right direction, and a warp straightening process for correcting the warping of the hat-shaped steel sheet pile 50 in the vertical direction. In the bending correction process, at least the arm portion 54 that is an outward bend in the arm portion 54 is pressed down by a pair of pressing rolls 3 and 4 that are vertically opposed to each other (bending correction step). Then, the warp correction processing is performed after the bending correction processing, and a plurality of pressing rolls 10, 11, 12, 13 that are alternately arranged on the downstream side of the pair of rolling rolls 3 and 4 and vertically in the transport direction. Thus, the arm portion 54 is pressed (warp correction step).

  More specifically, for example, when the bent and warped state of the hat-shaped steel sheet pile 50 is bent in the right direction (the end portion is directed to the right) with respect to the conveying direction, for example, in the bending correction processing, By rolling down the right arm portion 54 with the roll 4b and sequentially transporting the hat-shaped steel sheet pile 50 while being stretched in the longitudinal direction, a process for continuously correcting the bending in the longitudinal direction is executed. At this time, it is not necessary to reduce the upper roll 4a for reduction on the left side, but it is light enough not to reduce the thickness of the left arm portion 54 in order to prevent the hat-shaped steel sheet pile 50 from shifting in the left-right direction. It is controlled to be held with a load.

  In the subsequent warp correction processing, the right arm portion 54 is first bent in the upward warping direction by the three rolls of the lower roll 3 for pressing, the upper roll 10 for pressing, and the lower roll 11 for pressing. Thus, a load for correcting warpage is applied, and then the arm portion 54 is bent back in the downward warping direction by the three rolls of the pressing upper roll 10, the pressing lower roll 11, and the pressing upper roll 12. A load is applied to correct the warpage. Finally, once again, a load for correcting the warp is applied by the three rolls of the lower roll 11 for pressing, the upper roll 12 for pressing, and the lower roll 13 for pressing so as to eliminate the warp of the arm portion 54. As described above, in the warp correction processing, it is possible to efficiently correct the warp of the arm portion 54 by repeatedly bending and unbending the arm portion 54 and gradually reducing the bending amount.

Furthermore, in this correction process, it is determined that the bending of the end portion in the longitudinal direction of the hat-shaped steel sheet pile 50 out of the arms 54 of the hat-shaped steel sheet pile 50 is outward bending and the warping is an upward warping. About the arm part 54 made | formed by the determination process, the said arm part 54 is rolled down with the said one set of rolling-down rolls 3 and 4. As shown in FIG.
That is, as shown in FIG. 8 (a), in this type of hat-shaped steel sheet pile, the front and rear ends in the longitudinal direction of the left and right arms are locally bent outward at the ends, and There are many cases of warping. Therefore, in this straightening device 1, in the case of such outward bending and warping, the end portions of the hat-shaped steel sheet pile 50 are simultaneously pressed down by the left and right rolling rolls 3 and 4. It is controlled to correct the bending and warping at the same time.

  Specifically, when it is determined in the correction form determination process whether or not the end in the longitudinal direction of the hat-shaped steel sheet pile 50 is bent or warped, the outer bend and the upper as shown in FIG. When it is determined that a warp has occurred, the arm portion 54 is squeezed by a pair of squeezing rolls 3 and 4 facing each other in the vertical direction in a subsequent correction process. Thereby, the above-mentioned second knowledge makes it possible to simultaneously correct the bending and warping. This correction process of the outward bending and the warping form is particularly effective when both bending and warping at the end portion are generated.

  Further, in the correction process of the outward bending and warping form, after the end portion correction is performed as described above, a separate correction is further performed on the steady portion positioned between both ends of the hat-shaped steel sheet pile 50. It has become. That is, since the form of the stationary part of the hat-shaped steel sheet pile 50 is different from the form of bending and warping at both end parts, after correcting the end part, after adjusting the stroke of the hydraulic cylinder separately, Continue to correct the bending of the club. Note that, depending on the amount of bending of the hat-shaped steel sheet pile 50 and the form of the bending, the bending may not be corrected in one pass, but in such a case, the rolling reduction is performed in a plurality of passes.

Next, a straightening method of the hat-shaped steel sheet pile using the straightening device 1 and its operation / effect will be described.
As described above, the correction device 1 includes a bending correction unit that corrects the bending of the hat-shaped steel sheet pile 50 in the left-right direction and a warp correction unit that corrects the warping of the hat-shaped steel sheet pile 50 in the vertical direction. The bending correction means has a pair of reduction rolls 3 and 4 that can be pressed by holding the arm portion 54 of the hat-shaped steel sheet pile 50 from above and below, and the warp correction means is the reduction roll 3 of the bending correction means. 4 and three or more pressing rolls 10, 11, 12, 13 arranged alternately in the up and down direction in the conveying direction so as to be able to press the arm portion 54. And the correction method of the hat-shaped steel sheet pile using this straightening apparatus 1 corrects the curvature correction process which corrects the bending in the left-right direction of the hat-shaped steel sheet pile 50, and the curvature in the up-down direction of the hat-shaped steel sheet pile 50. In the bending correction process, the arm portion 54 of which at least the bending direction is the outward bending of the arm portion 54 is being rolled down by the pair of rolling rolls 3 and 4. Can be corrected. At this time, the arm portion 54 of the hat-shaped steel sheet pile 50 is warped in the vertical direction as described in the above knowledge by rolling down the arm portion 54. According to the correction method of the hat-shaped steel sheet pile using the three or more pressing rolls 10, 11, 12, 13 alternately arranged on the lower side and the upper side of the pair of rolling rolls 3, 4. For example, since the arm portion 54 is pressed by the three or more pressing rolls 10, 11, 12, and 13, the warp generated in the bending correction process can be corrected based on the first knowledge.

  Here, according to the correction device 1, in the above-described warp correction processing, the arm portion 54 is moved by the three rolls of the lower roll 3 for pressing, the upper roll 10 for pressing, and the lower roll 11 for pressing. A load for correcting warping is applied so as to bend in the upward warping direction. That is, in the correction device 1, the lower roll 3 for reduction, which is one of the set of reduction rolls that constitute the bending correction means, is arranged on the most upstream side of the three or more pressing rolls that constitute the warp correction means. Since it also serves as a pressing roll, one of the rolls constituting the straightening device 1 can be omitted. Therefore, the structure can be simplified and the cost of the apparatus can be suppressed.

  In the straightening process of the hat-shaped steel sheet pile 50 in the straightening device 1, a test or simulation is performed in advance on the correlation between the bending state of the hat-shaped steel sheet pile 50 and the amount of reduction according to the bending state, thereby correcting the bending. The degree of warpage according to the amount of reduction in the process is obtained, the degree of pressing by the pressing roll necessary to correct the warpage according to the amount of reduction is acquired in advance as table data, and the table data is Referring to the optimum degree of pressing by the pressing roll in accordance with the degree of reduction, appropriate control is possible. That is, in the correction method of the hat-shaped steel sheet pile, the degree of pressing by the pressing rolls 10, 11, 12, 13 in the warp correction process is adjusted according to the degree of reduction of the rolling rolls 3 and 4 in the bending correction process. Since it is possible, it is more suitable for correcting both the bending and warping of the hat-shaped steel sheet pile 50 to fall within the desired tolerance.

  Further, according to the correction device 1 and the correction method of the hat-shaped steel sheet pile, the correction form determination step for determining the form to be corrected of the hat-shaped steel sheet pile 50, the bending of the hat-shaped steel sheet pile 50 in the left-right direction, And a correction process for correcting warpage in the vertical direction. In the correction form determination process, it is determined whether or not the end of the hat-shaped steel sheet pile 50 in the longitudinal direction is bent and warped, and correction is performed. In the process, a pair of arms 54 are vertically opposed to the arm 54 that has been determined that the bending of the end in the longitudinal direction of the hat-shaped steel sheet pile 50 bends outward and the warping is upward. Since the reduction is performed by the reduction rolls 3 and 4, the bending and warping can be corrected simultaneously by the second knowledge.

  Thus, according to the straightening device 1 and the straightening method of the hat-shaped steel sheet pile using the same, it is possible to correct both the bending and warping of the hat-shaped steel sheet pile 50, and in particular, the stroke of the hydraulic cylinder is appropriately set. By changing, the right and left reductions in the longitudinal direction can be appropriately selected and the reduction amount can be changed as appropriate according to the bending and warping forms of the hat-shaped steel sheet pile 50, so the hat-shaped steel sheet pile 50 The bending and warping correction processing can be suitably performed.

Next, examples will be described.
In this example, the bending and warping of the hat-shaped steel sheet pile 50 shown in FIG. 2 were corrected by the correction device 1 described above and the method for correcting the hat-shaped steel sheet pile using the same. The hat-shaped steel sheet pile 50 has a product length of 10 m, an effective width W = 900 mm, an effective height H = 230 mm, a web thickness T1 = 10.8 mm, a flange thickness T2 = 8 mm, A thickness T3 = 10.0 mm was used.

Example 1
First, as a form of the bending, the bending is a substantially constant rightward bending over the entire length of the hat-shaped steel sheet pile 50, and the bending amount δ of the joint portion 53 defined in FIG. 4A is about 20 mm / 10 m. The hat-shaped steel sheet pile 50 was corrected. Note that the warpage amount S before correction defined in FIG. 4B was approximately 0 mm / 10 m for both joints.

  In the first embodiment, the bending correction by the reduction of the right arm portion 54 is divided into a total of three reverse passes, and the press rolls 10, 11, 12 disposed downstream of the reduction rolls 3, 4 in the third pass. 13, the warp of the arm portion 54 was corrected. The correction load at the time of bending correction by reduction was set to 294 kN for each path as a guide, and the load on the holding side (left side in this example) without reduction was set to 49 kN for each pass. Moreover, the amount of reduction of the upper roll for warp correction was 1.0 mm for the pressure roll 10 for warpage correction and 0.3 mm for the press roll 12 (hereinafter referred to as “Compliance Example 1”). As described above, the pressing amount (reduction amount) for warping correction is the pressing amount (when the roll position touches the upper surface of the arm portion 54 when the arm portion 54 is not warped and is in a straight state ( The amount of reduction) is defined as 0 mm.

  Further, as a comparative example, the right arm portion 54 was subjected to bending correction by reduction under the same conditions, and the case where no warp correction after bending correction was performed was also performed. And about each of the said suitable example 1 and a comparative example, the bending amount (delta) and the curvature amount S in the joint part 53 after correction | amendment were investigated. The results are shown in Table 1.

  As can be seen from Table 1, in the comparative example, the bending of the joint portion 53 was 3 mm on the right side, and this could be accommodated within 10 mm within the tolerance range. 53 has a large amount of warpage of −15 mm, and the left joint portion 53 has a large amount of warpage of +12 mm (the sign + represents an upward warp and the sign − represents a downward warp), which is 10 m in length of the hat-shaped steel sheet pile 50. It exceeded 10mm which is within the range of tolerance of bending and warping, and it was out of the tolerance range.

  On the other hand, in the fitting example 1, the bending amount of the joint portion 53 is 5 mm for the right bending, the warping amount of the right joint portion 53 is −2 mm, the warping amount of the left joint portion is +1 mm, and the bending amount and the warping amount. Both were able to be within the tolerance range of 10 mm.

(Example 2)
Next, the hat-shaped steel sheet pile 50 in which both end portions of the hat-shaped steel sheet pile 50 are outwardly bent and warped on both joint portions 53 (arm portions 54) side, and the stationary portion excluding both end portions is substantially straight. Then, correction was performed using the correction apparatus 1 (hereinafter referred to as “Compliance Example 2”).

  As for the amount of bending and warping at the end before correction, the end bending amount δ2 defined in FIG. 8A was 5 mm at both ends, and the end warping amount S2 was about 5 mm at both ends. In this adaptation example 2, only in the range of 1.5 m in the longitudinal direction from the end of the hat-shaped steel sheet pile 50 to the front and rear ends, both the left and right arms 54 have a set of three rolls of rolling rolls 3 and 4 with a correction load of 196 kN. Corrected with Note that the pressing rolls 10, 11, 12, and 13 arranged on the downstream side of the pair of rolling rolls 3 and 4 are not used in the second embodiment.

  Table 2 shows the results of examining the amount of bending and the amount of warping at the end after correction.

As can be seen from Table 2, in the hat-shaped steel sheet pile 50, in the case where both bending and warping occur at the end in the longitudinal direction, the bending and warping of the end are simultaneously performed by correction with the rolling rolls 3 and 4. It was confirmed that correction was possible efficiently.
In the second embodiment, an example in which the bending amount of the end portion is substantially equal on the left and right is shown. It was confirmed that the correction load ratio of the pair of upper rolls 4a and 4b for lowering each of the portions 54 was adjusted by making the right and left different, and correction was possible within the tolerance range.

In the above embodiment, both the first and second embodiments performed the three-pass rolling correction. However, by adjusting the rolling setting according to the size of the bending and the warping, the bending and the warping can be corrected even in the one-pass correction. It was also confirmed that correction was possible.
As described above, according to the correction device 1 and the method for correcting the steel sheet pile using the same, it is possible to correct both the bending and warping of the hat-shaped steel sheet pile 50.

The steel sheet pile correction method and steel sheet pile correction device according to the present invention are not limited to the above-described embodiments or examples, and various modifications are possible without departing from the spirit of the present invention. Of course.
For example, in the above-described embodiment, the correction device 1 shown in FIG. 1 has two pressing rolls 10, 11, 12, and 13 in the vertical direction, that is, two upper pressing rolls 10 and 12 on the upper side and a lower side. However, the present invention is not limited to this, and there are at least three pressing rolls alternately at the top and bottom. Since the arm portion 54 including the reduction rolls 3 and 4 can be bent at three points regardless of whether the warping direction is up or down, the arm portion 54 can be warped upward and downward. It can be corrected.

  Further, for example, in the above-described embodiment, the example has been described in which the upper pressing rolls 10 and 12 are movable in the vertical direction by the hydraulic cylinder and the lower pressing roll is fixed. Since it is only necessary to change the relative position in the facing direction of the upper and lower pressing rolls, for example, the upper pressing roll may be fixed and the lower pressing roll may be configured to be movable in the vertical direction.

  Moreover, in the said embodiment, although the bending of the steel sheet pile 50 and the curvature were measured using the position sensor 22 and the displacement sensor 24 incorporated in the correction apparatus 1, the measurement means of a curvature and curvature is restricted to this. In addition, since it is only necessary to know the bend and warpage before correction, it is also possible to install a bend warpage measuring device separately on the upstream side of the correction device 1.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the correction apparatus and correction method of one Embodiment of this invention, The figure (a) is the front view (A arrow in the figure (b)) of the correction apparatus, The figure (B) is the side view, and (c) is a BB cross-sectional view in (b). It is a perspective view explaining an example of a hat-shaped steel sheet pile applied to the straightening device and straightening method of the present invention. It is a figure for demonstrating the manufacturing process of the hat-shaped steel sheet pile generally performed conventionally. It is a figure explaining the state of the bending and curvature of the hat-shaped steel sheet pile applied to this invention, the figure (a) has shown the bending, and the figure (b) has shown curvature. It is a figure explaining the curvature correction apparatus used for experiment. It is a graph which shows an example of an experimental result, The figure (a) has shown the bending of the joint part, and the figure (b) has shown the curvature of the joint part. It is a figure explaining the curvature correction apparatus used for experiment, The figure (a) is the front view, The figure (b) is the side view. It is a figure explaining the state of the outward bending and the curvature at the edge part of the hat-shaped steel sheet pile applied to this invention, The figure (a) is a top view which shows the state of an outward bending, The figure (b) is the figure. It is a side view which shows the state of upper curvature. It is a figure explaining the state of the internal bending and the downward curvature in the edge part of the hat-shaped steel sheet pile applied to this invention, The figure (a) is a top view which shows the state of an internal bending, The figure (b) is the figure. It is a side view which shows the state of a downward curvature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Straightening device 2 Lower roll spindle 3 Lower roll for reduction (reduction roll)
4 Upper roll for reduction (reduction roll)
5 Lower roll chock 6 Drive motor 7 Reducer 8 Upper roll chock 9 Hydraulic cylinder 10, 12 Upper roll for pressing (pressing roll)
11, 13 Lower roll for pressing (pressing roll)
DESCRIPTION OF SYMBOLS 14 Upper roll spindle 15 Housing 20 Control part 22 Position sensor 24 Displacement sensor 50 Hat-shaped steel sheet pile 51 Web part 52 Flange part 53 Joint part 54 Arm part δ Bending amount S Warpage amount

Claims (5)

A web part extending in the left-right direction, a flange part projecting from the both ends of the web part toward one side in the vertical direction, an arm part projecting left and right from the tip of each flange part, and a tip of each arm part are provided. A method of correcting a steel sheet pile having a joint part,
Including a bending correction step of correcting the bending in the left-right direction of the steel sheet pile, and a warp correction step of correcting the warping in the vertical direction of the steel sheet pile,
In the bending correction step, at least the arm portion of the arm portion that is outwardly bent, the arm portion is pressed down by a pair of pressing rolls that are vertically opposed to each other,
In the warp correction step, the arm portion is pressed with three or more pressing rolls arranged alternately on the downstream side of the set of rolling-down rolls and vertically in the conveying direction. Method.   2. The method for correcting a steel sheet pile according to claim 1, wherein the degree of pressing by the pressing roll in the warp correction process is adjusted according to the degree of reduction in the bending correction process. A web part extending in the left-right direction, a flange part projecting from the both ends of the web part toward one side in the vertical direction, an arm part projecting left and right from the tip of each flange part, and a tip of each arm part are provided. A method of correcting a steel sheet pile having a joint part,
A correction form determination process for determining the form to be corrected of the steel sheet pile, a bending process in the left-right direction of the steel sheet pile, and a correction process for correcting warpage in the vertical direction,
In the correction form determination step, it is determined whether or not the bending and warping have occurred at the end in the longitudinal direction of the steel sheet pile,
In the straightening step, a pair of rolling rolls facing the arm portion up and down on the arm portion where the bending of the end portion in the longitudinal direction of the steel sheet pile is bent outward and the warpage is warped upward A method for correcting a steel sheet pile, wherein the sheet is squeezed with a screw. A web part extending in the left-right direction, a flange part projecting from the both ends of the web part toward one side in the vertical direction, an arm part projecting left and right from the tip of each flange part, and a tip of each arm part are provided. A straightening device used for straightening a steel sheet pile having a joint part,
Bending correction means for correcting the bending in the left-right direction of the steel sheet pile, and warp correction means for correcting the warp in the vertical direction of the steel sheet pile,
The bending correction means has a set of reduction rolls that can be reduced by sandwiching the arm portion of the steel sheet pile from above and below,
The warp correction means is disposed on the downstream side of the set of reduction rolls of the bending correction means, and has three or more pressing rolls arranged alternately in the transport direction so as to be able to press the arm part. A correction device for steel sheet piles.   One of the pair of reduction rolls constituting the bending straightening means is configured to serve as a pressing roll located on the most upstream side of the three or more pressing rolls constituting the warping straightening means. The steel sheet pile straightening device according to claim 4.

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