JP4846874B2 - Manufacturing method for steel for continuous underground wall - Google Patents

Description

The present invention relates to a method for producing a steel material for an underground continuous wall for constructing an underground continuous wall used as a retaining wall, a foundation structure, a retaining wall, a seawall of a harbor river, a water blocking wall, etc. About.
This application claims priority on February 12, 2009 based on Japanese Patent Application No. 2009-030310 for which it applied to Japan, and uses the content for it here.

  In the civil engineering and construction field, steel sheet piles are generally used as steel materials for underground continuous walls when building earth retaining walls to prevent the collapse of earth and sand, and retaining walls that support embankments and cuts. Has been. In recent years, in order to improve the cross-sectional performance as a steel material for continuous underground walls, as shown in FIG. 13, the underground continuous in which H-section steel 120 is fixed to a steel sheet pile 110 having a substantially hat-shaped cross section. A wall steel 101 has been proposed (see, for example, Patent Documents 1 and 2).

  This underground continuous wall steel material 101 is configured by fixing one flange portion 122 of the H-section steel 120 to the web portion 111 of the steel sheet pile 110. At the time of assembling the steel material 101 for the underground continuous wall, the corner portion formed by the web portion 111 of the steel sheet pile 110 and the flange portion 122 of the H-shaped steel 120 is continuous or discrete along the longitudinal direction. In general, a method of fixing by welding is used.

  By the way, steel sheet piles and H-section steel are formed in a factory by rolling or pressing. Therefore, like the hat-type steel sheet pile 130 shown in FIGS. 14A and 14B, the steel sheet pile and the H-shaped steel are shipped from the factory in a state where deformation called bending or warping has occurred. In addition, a bend here means that a steel sheet pile or H-shaped steel curves in the horizontal direction along the wall surface of the constructed underground continuous wall (refer FIG. 14A). Further, warpage means that a steel sheet pile or the like is bent in a direction perpendicular to the wall surface of the constructed underground continuous wall (see FIG. 14B).

  The steel sheet pile is required to be placed while being fitted with the joint portion of the adjacent steel sheet piles when the underground continuous wall body is constructed, so that the joint resistance at the time of placement is required to be kept below a certain value. Therefore, in order to prevent the joint portions of the adjacent steel sheet piles that have been placed from separating from each other, it is required that the deformation amount of the bending or warping of the steel material be a certain control value or less when shipped at the factory.

For example, regarding the hat-type steel sheet pile 130, according to JIS A5523, when the total length L (m) of the steel sheet pile exceeds 10 m, the deformation amount X (m) due to bending is required to satisfy the following formula (1). Therefore, it is required that the deformation Y (m) due to warpage satisfies the following formula (2). Similarly, the amount of deformation due to bending and warping required for JIS G3192 is specified for H-section steel.
X ≦ (L−10) × 0.10 (%) + 0.012 (1)
Y ≦ (L−10) × 0.20 (%) + 0.025 (2)

  The underground continuous wall steel material 101 is also driven while fitting the joint portions 117 of the steel sheet piles 110 constituting the adjacent underground continuous wall steel material 101 when the underground continuous wall body is constructed. For this reason, similarly to the hat-type steel sheet pile 130 described above, the underground continuous wall steel 101 also has a certain control value for the amount of deformation due to bending or warping of the steel sheet pile 110 constituting the underground continuous wall steel 101 after assembly processing. It is necessary to do the following.

JP 2002-212943 A JP 2005-127033 A

  Here, paying attention to the assembly process of the underground continuous wall steel 101, the deformation amount of the steel sheet pile 110 of the underground continuous wall steel 101 after the assembly is mainly formed by rolling or the like performed before welding. The amount of deformation of the steel sheet pile 110 that has been generated in advance and the amount of deformation of the steel sheet pile 110 caused by thermal strain due to welding are combined. For this reason, when assembling the steel 101 for the underground continuous wall using the steel sheet pile 110 or the H-section steel 120 whose deformation amount due to forming such as rolling is close to the control value limit, the underground continuous wall is caused by thermal strain during welding. The amount of bending and warping of the steel material 1 increases, and the possibility of deviating from the target management value increases.

  When bending and warping exceed the control value after assembling the steel material 101 for the underground continuous wall body, generally, straightening work by linear heating is performed after welding. This linear heating, for example, a part of the steel sheet pile 110 such as the joint portion 117 is partially contracted by heating and quenching, and bending and warping occurring in the steel material 101 for the underground continuous wall. This is a method of correcting bending and warping by applying temperature stress in the opposite direction. However, the work requires several hours to about a day, and the work cost is high. Moreover, there is a case where correction cannot be performed by linear heating, and if the control value is deviated after assembling the steel material 110 for the underground continuous wall body, there is a problem that it cannot be shipped from the factory.

  Also, in order to keep the deformation amount after assembly below the control value, it is considered to correct the steel sheet pile 110 or H-shaped steel 120 by linear heating from the stage before assembly, or to correct with a press machine or the like. However, this is not a desirable solution because it increases the number of processes and costs. In particular, when correction is performed by press working, the shape of the steel sheet pile 110 after pressing is restored by the elastic restoring force generated in the steel sheet pile 110 or the like during pressing. For this reason, since it is necessary to perform an operation so as to obtain a target shape in consideration of an elastic restoring force which is difficult to control, the correction operation is complicated in the case of correction by press working.

  In Patent Document 2, as an improvement measure, a method of carrying out the welding of the left and right ends of the steel sheet pile web portion and the flange portion of the H-shaped steel at the same time, or after completion of one of the left and right welding operations, A method of starting the welding operation on the other side under a condition where the temperature of the welded portion is 200 ° C. or higher is disclosed. Thereby, in the disclosed technique of Patent Document 2, thermal strain due to welding at both the left and right ends is equalized.

  However, in the method in which welding is performed simultaneously on the left and right, the operating current level and the welding speed differ depending on the skill and skill of the welding worker. For this reason, there is a high possibility that a thermal strain difference occurs between the left and right ends during the welding process, and it has been difficult to sufficiently suppress deformation during the welding process. In addition, in the method of starting the welding operation on the other side under the condition that the temperature of the welded part is 200 ° C. or higher after the welding operation on one of the two left and right sides is completed, not only the field work is complicated, but also welding is performed. It was difficult to manage and was not preferable from the viewpoint of workability.

  Therefore, the present invention has been devised in view of the above-described problems, and its purpose is to provide a steel material for underground continuous wall in which a steel sheet pile having a substantially hat-shaped cross section and an H-shaped steel are combined. By reducing the bending and warping of the steel sheet pile after assembly, it is possible to suppress the occurrence of straightening work after welding, and to make field work easy without depending on the skill of the technician. It is in providing the manufacturing method of the steel materials.

The present invention employs the following means in order to solve the above-described problems.
(1) In the first aspect of the present invention, the H-section steel has a bend in the opposite direction to the bend of the steel sheet pile or a bend smaller than this in the same direction,
A facing step of facing the flange portion of the H-beam with the web portion of the steel sheet pile;
A first fixing step of fixing the steel sheet pile and the H-shaped steel at a first fixing position; by bending the steel sheet pile and the H-shaped steel, bending in the width direction of the steel sheet pile and the H-shaped A bending correction step of correcting the bending in the width direction of the steel; and a second fixing position in which the steel sheet pile and the H-shaped steel are fixed at a second fixing position spaced apart from the first fixing position in the longitudinal direction of the steel sheet pile. A welding step of welding the steel sheet pile and the H-shaped steel along the longitudinal direction of the steel sheet pile ; performing the first fixing step, the bending correction step, and the second fixing step. It is a manufacturing method of the steel material for underground continuous walls which performs the said welding process after performing over several times so that it may space apart in the longitudinal direction of the said steel sheet pile from the said 1st fixed position .

(2) In the method for manufacturing a steel material for an underground continuous wall according to (1), the bending correction step is performed on the steel sheet pile at a position spaced from the first fixed position in the longitudinal direction of the steel sheet pile. A first bending correction jig mounting step for mounting one bending correction jig; and a first bending correction wedge piece driven between the first bending correction jig and a side surface of the H-shaped steel. And a bending correction wedge piece driving step.

(3) In the method for manufacturing a steel material for underground continuous wall according to (2), the first bending correction jig may be attached to the steel sheet pile by welding.

(4) In the method for manufacturing a steel material for underground continuous wall according to (2) above, the steel sheet pile at a position spaced apart in the longitudinal direction of the steel sheet pile from the position at which the first bending correction jig is attached. A second bending correction jig mounting step of attaching a second bending correction jig to the second step; driving a second bending correction wedge piece between the second bending correction jig and the side surface of the H-shaped steel; And 2 bending correction wedge piece driving step.

(5) In the method for manufacturing a steel material for an underground continuous wall according to (4) above, even if the second bending correction jig is the first bending correction jig removed from the steel sheet pile. Good.

(6) In the method for manufacturing a steel material for underground continuous wall according to any one of (1) to (5), the H-shaped steel is warped in the opposite direction to the warp of the steel sheet pile or in the same direction. A warp correction that has a warp smaller than this and corrects the warp in the thickness direction of the steel sheet pile and the warp in the thickness direction of the H-shaped steel by deforming the steel sheet pile and the H-shaped steel. You may further provide a process.

(7) In the method for manufacturing a steel material for underground continuous wall according to (6), the warp correction step is performed on the steel sheet pile at a position spaced from the first fixed position in the longitudinal direction of the steel sheet pile. A first warp correction jig mounting step for mounting one warp correction jig; and a first warp correction wedge piece between the first warp correction jig and the upper surface of the flange portion of the H-shaped steel. And a first warp correction wedge piece driving step for driving.

(8) In the method for manufacturing a steel material for underground continuous wall according to (7), the first warp correction jig may be attached to the steel sheet pile by welding.

(9) In the method for manufacturing a steel material for underground continuous wall according to (7), the steel sheet pile at a position spaced in the longitudinal direction of the steel sheet pile from a position at which the first warp correction jig is attached. A second warp correction jig mounting step for attaching a second warp correction jig to the second warp correction jig; and a second warp correction wedge between the second warp correction jig and the upper surface of the flange portion of the H-shaped steel. And a second warp correction wedge piece driving step for driving the piece.

(10) In the method for manufacturing a steel material for underground continuous wall according to (9), even if the second warp correction jig is the first warp correction jig removed from the steel sheet pile. Good.

(11) In the method for manufacturing a steel material for underground continuous wall according to (1) above, the steel sheet pile is composed of two Z-shaped steel sheet piles connected so as to have a hat-shaped steel sheet pile or a substantially hat-shaped cross section. May be. (12) In the method for manufacturing a steel material for an underground continuous wall according to (1), the first fixing step includes a step of fixing a fixing warp correction jig to the steel sheet pile; and the fixing warp correction treatment. And a step of driving a fixing wedge piece between the tool and the flange portion of the H-shaped steel.

  According to the structure of this invention as described in said (1) and (6), after changing simultaneously the steel sheet pile which comprises the steel material for underground continuous walls so that the bending and curvature may become small, it is H form. The steel is also deformed in the direction opposite to the direction in which the steel sheet pile is deformed, and then fixed in the deformed state. For this reason, the elastic restoring force which acts on H-section steel and a steel sheet pile counters. That is, the steel sheet pile is bent and warped by the elastic restoring force of the H-shaped steel, and is held. For this reason, it becomes possible to perform straightening work itself easily in the assembly process of the steel material for underground continuous walls. Also, in the present invention, when assembling the steel material for the underground continuous wall, since the fixing work is performed after correcting the bending and warping of the steel sheet pile, the steel sheet pile is not corrected after forming such as rolling. Compared to the case where the fixing work is performed, it is possible to greatly reduce the amount of deformation of the bending and warping of the steel sheet pile constituting the steel material for the underground continuous wall after welding. For this reason, it is possible to mass-produce steel materials for underground continuous walls having bending and warping lower than the control values required for bending and warping, and the occurrence of straightening work such as linear heating correction that has been conventionally performed after welding processing Can be significantly suppressed. As a result, it is possible to reduce the manufacturing cost and the manufacturing time of the underground continuous wall steel.

  According to the configuration of the present invention described in the above (2) and (7), the steel sheet pile correction operation is performed simply by driving a wedge piece such as a bending correction wedge piece or a warp correction wedge piece. Since it can be realized with only human power without the need for special heavy machinery or tools, it is extremely workable and economical.

  According to the configuration of the present invention described in the above (3) and (8), it becomes possible to easily attach and remove the bending correction jig and the warpage correction jig, and to improve workability. Become.

  According to the configuration of the present invention described in the above (4) and (9), since the bending and warping of the steel sheet pile and the H-shaped steel are corrected in a plurality of places, the bending and the warping can be corrected more accurately. Can do.

  According to the configuration of the present invention described in the above (5) and (10), it becomes possible to reduce the number of required bending correction jigs and warpage correction jigs, and to reduce the cost required for assembly work. Is possible.

It is a front view of the steel material for underground continuous walls obtained by the manufacturing method of the present invention. It is a top view of the underground continuous wall body constructed | assembled from several steel materials for underground continuous walls. It is a side view which shows roughly the structure of the steel sheet pile and H-section steel used at the time of the assembly of the steel material for underground continuous walls. It is a top view which shows roughly the structure of the steel sheet pile and H-section steel used at the time of the assembly of the steel material for underground continuous walls. It is a front view which shows the state in the middle of the assembly of the steel material for underground continuous walls. It is a perspective view for demonstrating the state by which the bending correction jig was fixed to the steel sheet pile. It is a top view which shows the state after a wedge correction wedge piece was driven with respect to the bending correction jig | tool. It is a perspective view for demonstrating the state by which the curvature correction jig was fixed to the steel sheet pile. It is a side view which shows the state after the wedge piece for curvature correction was driven in with respect to the curvature correction jig | tool. It is a schematic top view for demonstrating the 1st process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic top view for demonstrating the 2nd process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic top view for demonstrating the 3rd process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic top view for demonstrating the 4th process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic side view for demonstrating the 1st process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic side view for demonstrating the 2nd process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic side view for demonstrating the 3rd process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic side view for demonstrating the 4th process in the manufacturing method of the steel material for underground continuous walls which concerns on 1st Embodiment of this invention. It is a schematic side view for demonstrating the 1st process in the manufacturing method of the steel material for underground continuous walls which concerns on 2nd Embodiment of this invention. It is a schematic side view for demonstrating the 2nd process in the manufacturing method of the steel material for underground continuous walls which concerns on 2nd Embodiment of this invention. It is a schematic side view for demonstrating the 3rd process in the manufacturing method of the steel material for underground continuous walls which concerns on 2nd Embodiment of this invention. It is a schematic side view for demonstrating the 4th process in the manufacturing method of the steel material for underground continuous walls which concerns on 2nd Embodiment of this invention. It is a schematic top view for demonstrating the 1st process in the manufacturing method of the steel material for underground continuous walls which concerns on 3rd Embodiment of this invention. It is a schematic top view for demonstrating the 2nd process in the manufacturing method of the steel material for underground continuous walls which concerns on 3rd Embodiment of this invention. It is a schematic top view for demonstrating the 3rd process in the manufacturing method of the steel material for underground continuous walls which concerns on 3rd Embodiment of this invention. It is a front view which shows the other example of the steel material for underground continuous walls used as the object of application of this invention. It is a front view which shows the other example of the steel material for underground continuous walls used as the object of application of this invention. It is a front view which shows the further another example of the steel material for underground continuous walls used as the object of application of this invention. It is a front view for demonstrating the process of correcting curvature using a lever block. The bending deformation rate before and behind the assembly of the steel material for underground continuous walls assembled by application of the present invention is shown. The curvature deformation rate before and behind the assembly of the steel material for underground continuous walls assembled by application of the present invention is shown. It is a front view of the steel material for underground continuous walls for demonstrating a prior art. It is a perspective view for demonstrating the bending of a steel sheet pile. It is a perspective view for demonstrating the curvature of a steel sheet pile.

  Hereinafter, the manufacturing method of the steel material for underground continuous walls applied to a retaining wall etc. is demonstrated in detail as preferable embodiment of this invention.

  FIG. 1A shows a front view of steel material 1 for underground continuous wall obtained by the production method of the present invention. In the figure, a is the longitudinal direction of the steel sheet pile, b is the width direction of the steel sheet pile, and c is the thickness direction of the steel sheet pile.

  The underground continuous wall steel 1 includes a steel sheet pile 10 and an H-shaped steel 20.

  The steel sheet pile 10 is integrally provided in parallel with the web portion 11 from the web portion 11, the flange portion 12 integrally provided so as to be inclined inward on both sides of the web portion 11, and the tip of the flange portion 12. The arm part 13 and the joint part 14 provided at the tip of the arm part 13 are provided. The steel sheet pile 10 is formed into a substantially hat-shaped cross section by the web part 11, the flange part 12, and the arm part 13, and is constituted by a so-called hat-type steel sheet pile in this embodiment. Of the left and right joint parts 14 in the figure, one joint part 14a and the other joint part 14b are adjusted so as to be point-symmetric with each other in this embodiment.

  The H-section steel 20 includes a web portion 21 and a pair of flange portions 22 and 23 provided at both ends of the web portion 21. One flange portion 22 in the H-shaped steel 20 is fixed to the outside of the web portion 11 in the steel sheet pile 10 by fillet welding 27. This fillet weld 27 is applied to a corner portion formed by the web portion 11 of the steel sheet pile 10 and the flange portion 22 of the H-section steel 20. The fillet welds 27 may be applied discretely at arbitrary intervals along the longitudinal direction of the underground continuous wall steel 1 or may be applied continuously.

  The steel sheet pile 10 and the H-section steel 20 are formed by, for example, hot rolling or cold pressing.

  FIG. 1B shows a plan view as an example of the underground continuous wall body 5 constructed by connecting the steel materials for underground continuous wall 1 having such a configuration to each other. The underground continuous wall body 5 is configured as one wall body connected to each other via a joint portion 14 in the steel material 1 for the continuous wall in each region. The underground continuous wall 5 is configured by continuously arranging the same underground continuous wall steel 1.

  Next, the member used with the manufacturing method of the steel material 1 for underground continuous walls to which this invention is applied is demonstrated in detail.

  FIG. 2A is a side view schematically showing the configuration of the steel sheet pile 10 and the H-shaped steel 20 used when assembling the steel material 1 for the underground continuous wall, and FIG. 2B is an upper surface schematically showing these configurations. FIG.

  At the time of assembling the steel material 1 for the underground continuous wall, the H-shaped steel 20 has a bending in a direction opposite to the bending of the steel sheet pile 10 or a bending smaller than this in the same direction. In this embodiment, the steel sheet pile 10 and the H-section steel 20 each have a bending in the opposite direction.

  The bending of the steel sheet pile 10 and the H-section steel 20 here means that the steel sheet pile 10 and the H-section steel 20 are in the horizontal direction A along the wall surface of the built underground continuous wall body 5 as shown in FIG. 1A. It means that it is curved in a substantially convex shape. Moreover, the horizontal direction A here means the width direction of the web part 11 of the steel sheet pile 10, and the width direction of the flange part 22 of the H-section steel 20, and in other words, the steel sheet pile 10 or the H-shape. It means a direction perpendicular to the longitudinal direction of the steel 20 and parallel to the web portion 11 of the steel sheet pile 10 and the flange portion 22 of the H-section steel 20.

  Moreover, at the time of the assembly of the steel material 1 for underground continuous wall, the H-section steel 20 having a warp in the opposite direction to the warp of the steel sheet pile 10 or a warp smaller than this in the same direction is used. In this embodiment, the steel sheet pile 10 and the H-section steel 20 each have a warp in the opposite direction.

  The warp of the steel sheet pile 10 and the H-section steel 20 here is substantially the same as the direction of the steel sheet pile 10 or the H-section steel 20 in the direction B perpendicular to the wall surface of the built underground continuous wall body 5 as shown in FIG. 1B. It means that it is curved in a convex shape. The direction B here means the thickness direction of the web portion 11 of the steel sheet pile 10 and the thickness direction of the flange portion 22 of the H-section steel 20.

  2A and 2B, the steel sheet pile 10 has a bend in the direction P1, as shown in FIG. 2B, and the H-section steel 20 is in the direction P2 opposite to the direction P1. Has a bend. Further, as shown in FIG. 2A, the steel sheet pile 10 has a warp in the direction Q1, and the H-section steel 20 has a warp in the direction Q2 which is the direction opposite to the direction Q1. 2A and FIG. 2B is a symbol as an index indicating the amount of deformation, and does not mean a specific size, but about bending or warping of the steel sheet pile 10 and the H-section steel 20. The amount of deformation need not be the same size.

  FIG. 3 is a front view showing a state during the assembly of the steel material 1 for underground continuous wall. At the time of assembling the steel material 1 for the underground continuous wall, a bending correction jig 31 and a warp correction jig 33 fixed to one surface side of the steel sheet pile 10 are used. 4A is a perspective view for explaining a state in which the bending correction jig 31 is fixed, and FIG. 5A is a perspective view for explaining a state in which the warp correction jig 33 is fixed. In FIG. 4A and FIG. 5A, the joint portion 14 is omitted to simplify the drawing.

  The bending straightening jig 31 is opposed to the attachment surface 31a that is abutted and fixed along one surface side of the steel sheet pile 10 and the side surface 22a of the flange portion 22 of the H-section steel 20 with a space therebetween. And a pressing surface 31b. In the present embodiment, the bending correction jig 31 is made of a substantially trapezoidal steel plate. The mounting surface 31a of the bending correction jig 31 has a shape corresponding to a portion to be contacted on one surface side of the steel sheet pile 10. As long as the bending correction jig 31 includes the attachment surface 31a and the pressed surface 31b, the shape thereof is not particularly limited.

  The warp correction jig 33 is opposed to the mounting surface 33a that is abutted and fixed along one side of the steel sheet pile 10 and the inner surface 22b of the flange portion 22 of the H-shaped steel 20 with a space therebetween. And a pressing surface 33b. In the present embodiment, the warp correction jig 33 is composed of a substantially L-shaped steel plate. The attachment surface 33a of the warp correction jig 33 has a shape corresponding to a portion to be contacted on one surface side of the steel sheet pile 10. The shape of the warp correction jig 33 is not particularly limited as long as it includes the mounting surface 33a and the pressed surface 33b.

  The bend correction jig 31 and the warp correction jig 33 are not particularly limited with respect to the fixing means for the steel sheet pile 10, but are repeatedly attached and detached as described later, so that welding is performed from the viewpoint of improving workability. It is preferable to fix. In this case, after being fixed to the steel sheet pile 10, it can be removed by striking with a tool such as a hammer, and the removal work can be easily performed. Further, the bending correction jig 31 and the warp correction jig 33 both have their mounting surfaces 31a and 33a fixed to one surface side of the flange portion 12 of the steel sheet pile 10, but the steel sheet pile to which the H-shaped steel 20 is fixed. As long as it is a position on one side of 10 and the following correction operation can be performed, the position to be fixed is not particularly limited.

  As shown in FIG. 4A, a bending correction wedge piece 35 is driven between the pressed surface 31b of the bending correction jig 31 and the side surface 22a of the flange portion 22 of the H-section steel 20 facing the pressing surface 31b. FIG. 4B is a top view showing a state after the bending correction wedge piece 35 is driven. This bend correcting wedge piece 35 has inclined surfaces 35a and 35b which are inclined with respect to each other, and is formed at an acute angle by these inclined surfaces 35a and 35b.

  Further, as shown in FIG. 5A, a warp correction wedge piece 37 is driven between the pressed surface 33b of the warp correction jig 33 and the inner surface 22b of the flange portion 22 of the H-section steel 20 facing the pressed surface 33b. It is. FIG. 5B is a side view showing a state after the warp correcting wedge piece 37 has been driven. The warp correcting wedge piece 37 has inclined surfaces 37a and 37b that are inclined with respect to each other, and is formed at an acute angle by the inclined surfaces 37a and 37b.

  Both the bend correcting wedge piece 35 and the warp correcting wedge piece 37 are formed of a substantially triangular steel plate in this embodiment, but the wedge having such inclined surfaces 35a, 35b, 37a, 37b. If it is comprised as, the shape and material will not be specifically limited.

  Next, 1st Embodiment of the manufacturing method of the steel material 1 for underground continuous walls which concerns on this invention is described.

  6A to 6D are schematic top views for explaining a process at the time of assembling the underground continuous wall steel 1, and FIGS. 7A to 7D are schematic side views thereof.

  First, as shown in FIG. 6A and FIG. 7A, on the web part 11 of the steel sheet pile 10, it has the curvature of the opposite direction to the curvature of the steel sheet pile 10, and the H shape which has the curvature of the opposite direction to the curvature of the steel sheet pile 10. One flange portion 22 of the steel 20 is disposed.

  In arranging the H-section steel 20 on the web part 11 of the steel sheet pile 10, the relative position in the width direction and the longitudinal direction of the steel sheet pile 10 and the H-section steel 20 in a part of the range extending in the longitudinal direction, Position the orientation. At the time of positioning, the center position L2 in the width direction of the web portion 11 of the steel sheet pile 10 and the center position L1 in the width direction of the flange portion 22 of the H-section steel 20 are substantially matched in a part of the range extending in the longitudinal direction. In addition, the web portion 11 of the steel sheet pile 10 and the flange portion 22 of the H-shaped steel 20 are brought into contact with each other. In the present embodiment, the end portions in the longitudinal direction of the steel sheet pile 10 and the H-shaped steel 20 are made to face each other at the time of positioning.

  After the positioning, the steel sheet pile 10 and the H-shaped steel 20 are fixed at the positioned part. At the time of fixing the steel sheet pile 10 and the H-shaped steel 20, fixing metal fittings such as welding, bolting, screw-type clamps, and lever blocks (registered trademark) may be used, or other appropriate jigs for fixing may be used. Also good. In the present embodiment, the steel sheet pile 10 and the H-section steel 20 are fixed using the warp correction jig 33. At the time of fixing the steel sheet pile 10 and the H-shaped steel 20, the warp correction jig 33 and the H-shaped steel are fixed to the one side of the steel sheet pile 10 by welding or the like at the position where the steel sheet pile 10 is fixed. A warp correcting wedge piece 37 is driven between the inner surface 22 b of the 20 flange portions 22. For example, as shown in FIG. 5B, the warp correction wedge piece 37 is arranged with the tip 37 d of the warp correction wedge piece 37 disposed between the warp correction jig 33 and the flange portion 22 of the H-shaped steel 20. The warp correcting wedge piece 37 is driven by striking the bottom surface 37c with a tool such as a hammer.

  By the driving of the warp correction wedge piece 37, the inclined surface 37a of the warp correction wedge piece 37 contacting the pressed surface 33b of the warp correction jig 33 presses the warp correction jig 33 upward, and the warp correction treatment is performed. The inclined surface 37b of the warp correcting wedge piece 37 contacting the inner surface 22b of the flange portion 22 of the H-section steel 20 causes the flange portion 22 to act on the steel sheet pile 10 to which the tool 33 is fixed. By pressing downward, a load in the direction S2 is applied to the H-section steel 20. That is, the steel sheet pile 10 and the H-shaped steel 20 are fixed to each other at the position where the steel sheet pile 10 and the H-shaped steel 20 are positioned by driving the wedge piece 37 for correcting warpage.

  Next, the bending and warping of the steel sheet pile 10 are corrected. In the correction of the bending, the steel sheet pile 10 is deformed so that the bending is corrected, and the steel sheet pile 10 is deformed in a direction opposite to the direction in which the steel sheet pile 10 is deformed with respect to the bending. The width direction center position L2 of the web portion 11 and the width direction center position L1 of the flange 22 of the H-shaped steel 20 are substantially matched. The correction of the warp is performed by deforming the steel sheet pile 10 so that the warp is corrected, and by deforming the H-shaped steel 20 in a direction opposite to the direction in which the steel sheet pile 10 is deformed with respect to the warp. This is performed by substantially pressing the web portion 11 and the flange portion 22 of the H-shaped steel 20 together.

  In order to correct the bending, first, as shown in FIG. 6B, the steel sheet pile 10 and the H-section steel 20 fixed after positioning are separated from each other in the longitudinal direction from the fixing portion (fixed position) 43. A bending correction jig 31 is fixed to one side of the sheet pile 10 by welding or the like.

  Next, a bending correction wedge piece 35 is driven between the pressed surface 31 b of the bending correction jig 31 and the side surface 22 a of the H-section steel 20. For example, as shown in FIG. 4B, the bending correction wedge piece 35 is arranged with the tip 35 d of the bending correction wedge piece 35 disposed between the bending correction jig 31 and the flange portion 22 of the H-shaped steel 20. It is driven by hitting the bottom surface 35c of the bending correction wedge piece 35 with a tool such as a hammer.

  As shown in FIG. 4B, the inclined surface 35 a of the bending correction wedge piece 35 in contact with the pressed surface 31 b of the bending correction jig 31 presses the bending correction jig 31 by driving the bending correction wedge piece 35. Then, the load in the direction R1 is applied to the steel sheet pile 10 to which the bend correction jig 31 is fixed, and the bend correction wedge piece 35 in contact with the side surface 22a of the flange portion 22 of the H-section steel 20 is inclined. The surface 35b presses the flange portion 22 to apply a load in the direction R2 to the H-section steel 20.

  Here, the bending correction jig 31 is opposite to the center position L2 in the width direction of the web portion 11 of the steel sheet pile 10 with respect to the center position L1 of the flange portion 22 of the H-section steel 20 in the top view. It is necessary to fix to the steel sheet pile 10 by the side. As a result, when the bending correction wedge piece 35 is driven, a load is applied to the steel sheet pile 10 and the H-shaped steel 20 in opposite directions, and according to the driving amount of the bending correction wedge piece 35, the steel sheet pile 10 is The deformation is performed so that the bending is corrected, and the H-section steel 20 is deformed in a direction opposite to the direction in which the bending of the steel sheet pile 10 is deformed. The bending correction wedge piece 35 has a center position L2 in the width direction of the web portion 11 of the steel sheet pile 10 and a width of the flange portion 22 of the H-section steel 20 in the portion where the bending correction wedge piece 35 is driven. It is driven in until it is deformed to the extent that it substantially matches the center position L1 of the direction.

  In order to correct the warp, first, as shown in FIG. 7B, a warp correction jig is formed on one surface side of the steel sheet pile 10 at a position spaced in the longitudinal direction from a fixing portion (fixed position) 43 formed after positioning. 33 is fixed by welding or the like. Thereafter, as described above, by applying the warp correction wedge piece 37, a load is applied to the steel sheet pile 10 and the H-shaped steel 20 in opposite directions, respectively, and according to the drive amount of the warp correction wedge piece 37. The steel sheet pile 10 is deformed so that the warp is corrected, and the H-section steel 20 is deformed in a direction opposite to the direction in which the warp of the steel sheet pile 10 is deformed. The warp correcting wedge piece 37 is driven until the steel sheet pile 10 and the H-shaped steel 20 are deformed so as to be substantially press-bonded to each other at the portion where the warp correcting wedge piece 37 is driven.

  The steel sheet pile 10 and the H-shaped steel 20 are deformed at the portion where the bend correction jig 31 and the warp correction jig 33 are fixed by driving the bend correction wedge piece 35 and the warp correction wedge piece 37. It is held in a deformed state.

  As shown in FIGS. 6C, 6D, 7C, and 7D, the bend-correcting wedge piece 35 and the warp-correcting wedge piece 37 are driven by a fixed portion (fixed position) 43 formed after positioning. Multiple times so as to be spaced apart from each other in the longitudinal direction. Thereby, as shown to FIG. 6D and FIG. 7D, the bending and curvature of the steel sheet pile 10 are corrected over the full length of a longitudinal direction.

  Next, as shown in FIG. 6D and FIG. 7D, the web portion 11 of the steel sheet pile 10 and the flange portion 22 of the H-section steel 20 are held while maintaining the deformed state of the steel sheet pile 10 and the H-section steel 20. Weld along the longitudinal direction. In this case, fillet weld 27 is performed on the corner formed by the web portion 11 of the steel sheet pile 10 and the flange portion 22 of the H-section steel 20. In this case, since the steel sheet pile 10 and the H-section steel 20 are brought into a pressure-bonded state along the longitudinal direction by the driving of the warp correcting wedge piece 37, the welding operation can be easily advanced.

  Thereafter, the bending correction jig 31 and the warp correction jig 33 fixed to the steel sheet pile 10 are removed, and the assembly of the steel material 1 for the underground continuous wall is completed.

  Next, the effect which the manufacturing method of the steel material 1 for underground continuous walls concerning such this invention shows is demonstrated.

  In the present invention, the steel sheet pile 10 constituting the steel material 1 for the underground continuous wall is bent and deformed so that the warpage is reduced, and the H-shaped steel 20 is also opposite to the direction in which the steel sheet pile 10 is deformed. After being deformed, they are fixed in the deformed state, so that the elastic restoring force acting on them cancels each other. That is, the steel sheet pile 10 is held in a state in which the bending and warping of the steel sheet pile 10 are corrected by the elastic restoring force of the H-shaped steel 20. For this reason, the restoration of the shape by the elastic restoring force that has occurred in the straightening work such as the conventional press work is not a big problem, and the straightening work itself is easily performed in the assembling process of the steel material 1 for the underground continuous wall. It becomes possible.

  Moreover, in this invention, at the time of the assembly of the steel material 1 for underground continuous walls, welding is performed after correcting the bending and warping of the steel sheet pile 10. For this reason, compared with the case where it welds without performing correction after shaping | molding, such as rolling, about the steel sheet pile 10, the bending and curvature of the steel sheet pile 10 which comprises the steel material 1 for underground continuous walls after a welding process. It is possible to greatly reduce the amount of deformation. For this reason, it is possible to mass-produce the steel material 1 for underground continuous wall having a bending or warping lower than the control value required for bending or warping, and for straightening work such as linear heating correction that has been conventionally performed after welding processing. Occurrence can be greatly suppressed. As a result, it is possible to reduce the manufacturing cost and shorten the manufacturing time of the steel material 1 for underground continuous wall. Moreover, in order to make the deformation amount after assembling the steel material 1 for the underground continuous wall less than the control value, it is not necessary to correct the steel sheet pile 10 or the H-shaped steel 20 from the stage before assembling. Therefore, it is possible to reduce the manufacturing cost and the manufacturing time.

  Further, in the present invention, the correction work of the steel sheet pile 10 can be realized only by performing a simple operation such as driving a wedge piece such as a bending correction wedge piece 35 or a warp correction wedge piece 37, and a special heavy machine. Because it can be realized by human power without the need for tools and tools, it is extremely workable and economical.

  Next, 2nd Embodiment of the manufacturing method of the steel material 1 for underground continuous walls which concerns on this invention is described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  8A to 8D are schematic side views for explaining the steps of the second embodiment of the present invention.

  In this embodiment, as shown in FIG. 8A, the H-section steel 20 is arranged on the web portion 11 of the steel sheet pile 10 in the same procedure as in the first embodiment, and after positioning these, in part. Fix it. Next, the bend correcting wedge piece 35 and the warp correcting wedge piece 37 are driven in order to correct the bend and the warp. Before that, the warp correcting wedge piece 37 is driven after positioning. The steel sheet pile 10 and the H-section steel 20 are fixed by welding or the like at a fixing portion (fixed position) 43 which is a part. In this embodiment, as shown in FIG. 8B, the steel sheet pile 10 and the H-section steel 20 are fixed by spot welding 41 on both sides in the longitudinal direction of the warp correction jig 33.

  Next, after removing the warp correction jig 33 from the steel sheet pile 10, a bending correction jig 31 (not shown) is attached to the steel sheet pile 10 at a position spaced from the fixing portion (fixed position) 43 formed after positioning. It is fixed by welding or the like, and a bending correction wedge piece 35 is driven in to correct the bending of the steel sheet pile 10. Subsequently, the warp correction jig 33 previously removed on the opposite side to which the H-shaped steel 20 is sandwiched with respect to the fixed bending correction jig 31 is fixed to the steel sheet pile 10 by welding or the like. The piece 37 is driven. Subsequently, the steel sheet pile 10 and the H-shaped steel 20 are fixed by spot welding 41 or the like at the portion where the bending correction wedge piece 35 or the warp correction wedge piece 37 is driven, and then the bending correction jig 31 is fixed. Then, the warp correction jig 33 is removed from the steel sheet pile 10. Thereafter, as shown in FIG. 8C, the above-described operations are repeated by using these correction jigs at the time of the bending correction operation and the warp correction operation at the positions separated in the next longitudinal direction. As shown, the steel sheet pile 10 and the H-section steel 20 are welded and fixed along the longitudinal direction.

  By adopting such a method, the same bend correction jig 31, the warp correction jig 33, the bend correction wedge piece 35, and the warp correction wedge piece 37 are repeatedly used during a plurality of bend correction operations and warp correction operations. It becomes possible. That is, it becomes possible to reduce the number of required bending correction jigs 31 and warpage correction jigs 33, and to reduce the cost required for the assembly work.

  Next, 3rd Embodiment of the manufacturing method of the steel material 1 for underground continuous walls which concerns on this invention is described.

  9A to 9D are schematic top views for explaining the steps of the third embodiment of the present invention.

  In this embodiment, it is assumed that the correction of the curvature of the steel sheet pile 10 and the H-section steel 20 is not performed, but only the correction of the bending is performed. For this reason, in this embodiment, the H-section steel 20 which has the curvature of the opposite direction to the curvature of the steel sheet pile 10 and has the curvature of the same direction as the curvature of the steel sheet pile 10 is used, and the steel sheet pile 10 and the H-section steel 20 The same amount of deformation due to warpage is used.

  First, as shown in FIG. 9A, the flange portion 22 of the H-section steel 20 is disposed on the web portion 11 of the steel sheet pile 10 at the intermediate portion 47 in the range extending in the longitudinal direction between the steel sheet pile 10 and the H-section steel 20. The center position L2 in the width direction of the web portion 11 of the steel sheet pile 10 and the center position L1 in the width direction of the flange 22 of the H-section steel 20 are positioned so as to be substantially matched, and then fixed by spot welding 41. To do. Thus, it does not specifically limit about the site | part fixed after arrange | positioning the H-section steel 20 on the web part 11 of the steel sheet pile 10. FIG.

  Next, as shown in FIG. 9B, the bending of the steel sheet pile 10 is corrected at a position spaced apart from the fixing portion (fixed position) 43 between the steel sheet pile 10 and the H-shaped steel 20 formed after the positioning. After the jig 31 is fixed by welding or the like, the bending correction wedge piece 35 is driven. Also in this case, the bending correction jig 31 is opposite to the center position L2 in the width direction of the web portion 11 of the steel sheet pile 10 with respect to the center position L1 of the flange portion 22 of the H-section steel 20 in the top view. It fixes to the steel sheet pile 10 by the right side in the figure which is a side.

  Thereafter, as shown in FIG. 9C, the bending correction wedge piece 35 is driven multiple times so as to be spaced apart from the fixing portion (fixed position) 43 formed after positioning on both sides in the longitudinal direction. Then, the steel sheet pile 10 and the H-section steel 20 are welded along the longitudinal direction.

  As described above, even when the warp correction is not performed, the cross-section in the weak axis direction in which the second-order moment in the strong axis direction, which is the plate thickness direction, of the flange portion 22 of the H-section steel 20 is the plate thickness direction in the web portion 21. Since the rigidity in the strong axis direction, which is the direction in which the H-section steel 20 is warped, is higher than the secondary moment, the steel sheet pile 10 is unlikely to be warped due to thermal strain during welding. Therefore, even in this case, it is possible to mass-produce the steel material 1 for the underground continuous wall having bending and warping lower than the control values required for bending and warping, such as linear heating correction that has been conventionally performed after welding processing. The expected effect of the present invention that the occurrence of correction work is greatly suppressed is exhibited.

  In addition, the steel material 1 for underground continuous walls used as the object of application of this invention is not limited to the example mentioned above, but rather than the width direction length of the web part 11 of the steel sheet pile 10, as shown to FIG. 10A. The length in the width direction of the flange portion 22 of the H-shaped steel 20 may be long. In this case, the bending correction jig 31 is formed of an L-shaped steel plate so that the pressed surface 31 b faces the side surface 22 a of the flange portion 22 of the H-section steel 20. The warp correction jig 33 is composed of a substantially U-shaped steel plate so that the pressed surface 33 b faces the inner surface 22 b of the flange portion 22 of the H-section steel 20. In addition, the steel sheet pile 10 is deformed to be bent and warped by use of the bending correction jig 31, the bending correction wedge piece 35, and the like, and then the web portion 11 of the steel sheet pile 10 and the flange portion of the H-section steel 20 are used. 22 is fixed by applying flare welding 29 discretely or continuously in the longitudinal direction.

  Moreover, as for the steel material 1 for underground continuous walls in this invention, the flange part 22 of the H-section steel 20 may be fixed inside the web part 11 in the steel sheet pile 10, as shown to FIG. 10B.

  Moreover, the steel material 1 for underground continuous walls in this invention may be comprised, combining the what is called Z-type steel sheet pile 50 with the steel sheet pile 10 as shown to FIG. 11A. The Z-type steel sheet pile 50 includes a web portion 51, arm portions 52 provided on both sides of the web portion 51, and a joint portion 14 provided at the distal end of the arm portion 52. 52 and a substantially Z-shaped cross section.

  The steel sheet pile 10 in FIG. 11A has a Z-type steel sheet pile 50A in which the joint portions 14 on both sides are opened on the lower side in the drawing, and the joint portions 14 on both sides are opened in the upper side in the drawing, and the arrangement of the web portion 51 and the arm portion 52 is arranged. By connecting the Z-shaped steel sheet pile 50B, which is mirror-symmetrical with respect to the Z-shaped steel sheet pile 50A, via the joint portion 14, the cross-sectional shape is substantially hat-shaped. Although the Z-type steel sheet pile 50A and the Z-type steel sheet pile 50B do not necessarily have to be integrated, the joint portion 14 fitted to each other is welded or pressed by a press machine before assembling the steel material 1 for underground continuous wall. It is desirable to fix and integrate them by so-called caulking (mechanical adhesion) or the like and process them into a substantially hat-shaped cross section.

  In this steel sheet pile 10, the web part 11 as the steel sheet pile 10 is formed by the arm part 52 having the joint part 14 fitted to each other, and the flange as the steel sheet pile 10 is formed by the web part 51 of each Z-shaped steel sheet pile 50. The arm portion 13 as the steel sheet pile 10 is formed by the arm portion 52 of the Z-shaped steel sheet pile 50 that is formed with the portion 12 and is not fitted to the other joint portion 14.

  Incidentally, the steel sheet pile 10 may be composed of a hat-type steel sheet pile as shown in FIGS. 1A and 1B, and as shown in FIG. 11A, two Z-shapes connected so as to have a substantially hat-shaped cross section. You may be comprised from the steel sheet piles 50A and 50B. That is, the steel sheet pile 10 has a shape in which the joint portions 14 on both sides in the width direction can be fitted to other joint portions 14 in the other adjacent steel material 1 for underground continuous wall. As long as the fitting strength is increased so that the joint portions 14 are not separated from each other at the time, the shape is not particularly limited. For this reason, in addition to the case where the joint portions 14 on both sides in the width direction of the steel sheet pile 10 are configured so as to be point-symmetric with each other, as shown in FIG. 1A, FIG. You may be comprised from the coupling bent by the cold press work, the combination coupling | joint of the substantially C-shaped steel pipe and bar | burr with a slit, etc.

  Moreover, as for the steel material 1 for underground continuous walls in this invention, the length of the longitudinal direction of the steel sheet pile 10 and the length of the longitudinal direction of the H-section steel 20 may differ.

  Further, in the present invention, as shown in FIG. 11B, a pulling device 61 including a lever block 64 may be used as an alternative to the warp correction wedge piece 37 when the warp is corrected. Hereinafter, an example of a method of using the attracting device 61 will be described.

  The pulling device 61 includes a chain 63, hooks 62 provided on both sides of the chain 63, and a lever block 64 that is provided at an intermediate portion of the chain 63 and winds up the chain 63 by operating the lever 65. When the warp is corrected, the chains 63 of the two attracting devices 61 are connected via the hooks 62 to form an annular shape. And after winding the two attracting devices 61 formed in this ring shape around the cross-sectional outer side orthogonal to the longitudinal direction of the steel material 1 for underground continuous walls, the chain 63 is wound up by the lever 65 operation. Thereby, a load is applied in the direction in which the steel sheet pile 10 and the H-section steel 20 are close to each other, and the steel sheet pile 10 and the H-section steel 20 are deformed so as to be bonded to each other. As long as the steel sheet pile 10 and the H-shaped steel 20 can be deformed so as to be pressure-bonded to each other by using the pulling device 61 as described above, it is not particularly limited to such a usage method.

  In the present invention, the steel sheet pile 10 and the H-shaped steel 20 may be deformed in opposite directions by mechanical means such as a robot arm when correcting warpage or bending. Even in this case, welding is performed after the steel sheet pile 10 and the H-section steel 20 are welded along the longitudinal direction while the deformed state is maintained to perform a correction process for bending and warping of the steel sheet pile 10. Therefore, the deformation amount of bending and warping of the steel sheet pile 10 constituting the steel material 1 for underground continuous wall after welding is reduced.

  Moreover, in embodiment shown to FIG. 6A-FIG. 6D and FIG. 9A-FIG. 9D, in top view, the steel sheet pile 10 which has the curved curved substantially convex shape in the right direction in a figure, and substantially convex shape in the left direction in a figure. Although the example of a combination with the H-section steel 20 which has the curved curve in the figure was shown, the combination of what each has the curve of the direction opposite to illustration may be sufficient. Moreover, in embodiment shown to FIG. 7A-FIG. 7D and FIG. 8A-FIG. 8D, in the side view, the steel sheet pile 10 which has the curvature curved in the convex direction upwards, and the curvature curved in the substantially convex shape in the downward direction Although the example of combination of the H-section steel 20 which has these was shown, the combination of what each has the curvature of the opposite direction to illustration may be sufficient.

  Moreover, in this invention, as the H-section steel 20 arrange | positioned on the web part 11 of the steel sheet pile 10 at the time of the assembly process of the steel material 1 for underground continuous walls, a bending smaller than this in the same direction as the bending of the steel sheet pile 10 is carried out. What has it may be arrange | positioned, and what has a curvature smaller than this in the same direction as the curvature of the steel sheet pile 10 may be arrange | positioned. In any case, since the welding process will be performed after correcting the bending and warping of the steel sheet pile 10, compared to the case of performing the welding process without correcting the steel sheet pile before the welding process, It becomes possible to reduce the bending and the curvature of the steel sheet pile 10 which comprises the steel material 1 for underground continuous walls after welding.

  Here, the H-section steel 20 arranged on the web part 11 of the steel sheet pile 10 at the time of assembling the steel material 1 for the underground continuous wall is bent in the opposite direction to the bending or warping of the steel sheet pile 10 for the following reasons. It is desirable to arrange the one having warp from the viewpoint of on-site processing management. When the H-section steel 20 having a bend or warp smaller than these in the same direction as the bend or warp of the steel sheet pile 10 is arranged, for example, the H-shaped steel 20 having a bend larger than this in the same direction as the bend of the steel sheet pile 10. Cannot be arranged on the steel sheet pile 10, and the shape of the H-section steel 20 that can be applied is restricted. On the other hand, when the H-section steel 20 is bent in the direction opposite to the bending and warping of the steel sheet pile 10, the H-section steel 20 is bent in any direction at the preparation stage before the arrangement, and warps. Even if it has, the bending and warping of the H-section steel 20 can be reversed only by rotating the H-section steel 20 by 180 ° about the horizontal axis or the vertical axis. The restrictions due to the shape can be greatly reduced, and the present invention can be easily applied. Further, the steel sheet pile 10 is largely corrected when the steel sheet pile 10 is bent, bent in the direction opposite to the warp, and the H-shaped steel 20 having the warp is disposed.

  In addition, there are site restrictions depending on the processing site, and when it is assumed that it is difficult to rotate the H-shaped steel 20 by 180 °, the assembly processing of the steel material 1 for the underground continuous wall is performed as follows. Also good. First, at the time of material acceptance inspection of the plurality of steel sheet piles 10 and the H-shaped steel 20, the material number is written for each steel material, and then the bending and warping of each steel material are measured. Then, when assembling the steel material 1 for underground continuous wall, as the H-section steel 20 arranged on the web part 11 of the steel sheet pile 10, a bending smaller than this is made in the opposite direction or the same direction as the bending of the steel sheet pile 10. Steel sheet pile 10 and H combined based on the measurement result of the previous measurement so as to arrange one having a warp smaller than this in the opposite direction or the same direction as the warp of steel sheet pile 10 The shape steel 20 is selected. Then, the assembly work as described above is performed. The intended effect of the present invention is also exhibited by such a procedure.

Hereinafter, the effects of the present invention will be further described with reference to examples. In the examples, the steel material 1 for underground continuous wall was assembled from a steel sheet pile 10 having the dimensions, bending deformation rate, and warpage deformation rate of the conditions shown in Table 1 below by applying the present invention. The steel sheet pile 10 uses a hat-shaped steel having an effective width of 900 mm, a height of 230 mm, a cross-sectional area of 110 cm ² , a cross-sectional secondary moment of 9430 cm ³ per sheet of 10H, and a H-section steel 20 Used were those having a height of 700 to 900 mm, and steel sheet pile 10 and H-section steel 20 having the same length in the longitudinal direction were used. As the H-section steel 20, a steel sheet pile 10 having a bending deformation rate and a warp deformation rate comparable to those of the steel sheet pile 10 in the opposite direction to the warp was used. The leg length of the welded part by welding performed in the main welding process was set to 7 mm that is generally used.

The length in Table 1 is the length of the entire length of the member, the welding rate is the ratio of the welding length to the length of the total length of the member, and the bending deformation rate and the warping deformation rate are shown in FIG. 2A. As shown in FIG. 2B, the maximum deformation amount Δ due to bending or warping of the steel sheet pile 10 or the H-section steel 20 is divided by the length L between both ends in the longitudinal direction. Further, the allowable value is a numerical value obtained by dividing the deformation tolerance (Δ) for bending or warping of the hat-type steel sheet pile described in JIS A5523 by the length L, and the allowable value of the bending deformation rate. Is represented by the following mathematical formula (3), and the allowable value of the warp deformation rate is represented by the mathematical formula (4). If it is less than this allowable value, the joint resistance at the time of placing can be suppressed to a certain value or less, and the performance required as a steel material for underground continuous walls is satisfied, as with a normal steel sheet pile. Become.
{(L-10) × 0.10 × 0.01 + 12 × 0.001} / L (3)
{(L-10) × 0.20 × 0.01 + 25 × 0.001} / L (4)

  FIG. 12A shows a change in the bending deformation rate before and after assembling the steel material 1 for the underground continuous wall, and FIG. 12B shows a change in the warp deformation rate before and after the assembly. As for the bending, as shown in FIG. 12A, the bending in 7 cases out of 9 cases is the same or smaller than that before assembling. Further, as shown in Table 1, the bending is assembled in all examples in 9 cases. It can be confirmed later that it is within the allowable value of JIS. Moreover, although the example of the numbers F and G exceeded the allowable value of JIS before the assembly, it can be confirmed that it is within the allowable value after the assembly. As shown in Table 1 and FIG. 12B, it can be confirmed that the warpage is within an allowable value after assembling in all nine examples. In addition, in the examples of numbers G and H where the welding rate is 100%, it is assumed that the amount of deformation due to welding increases, but it can be confirmed that bending and warping are within allowable values in these examples.

As described above, a pair of flange portions are provided at both ends of the web portion, an arm portion is provided at the distal end of the flange portion, and a joint portion is provided at the distal end of the arm portion. In the method for manufacturing a steel material for underground continuous wall comprising a steel sheet pile having a shape and an H-section steel member having one flange portion fixed to the outside or inside of the web portion of the steel sheet pile by the width direction of the web portion On the web part of the steel sheet pile having a bend, one flange part of the H-shaped steel having a bend in the opposite direction to the bend of the steel sheet pile or a bend smaller than this in the same direction is arranged, The steel sheet pile and the H-shaped steel are deformed in opposite directions so that the bending is corrected, and the steel sheet pile and the H-shaped steel are welded along the longitudinal direction while maintaining the deformed state. To do.
In the method for manufacturing the steel material for continuous underground wall, the warp in the opposite direction to the warp of the steel sheet pile or the same direction on the web part of the steel sheet pile further having warp in the thickness direction of the web part. The steel sheet pile and the H-shaped steel may be deformed in opposite directions so that the H-shaped steel having a small warpage is further arranged and the bending and warping of the steel sheet pile are corrected.
In the manufacturing method of the steel material for underground underground walls, the H-shaped steel arranged on the web portion of the steel sheet pile is partially fixed to the steel sheet pile, and the steel sheet pile and the H-shaped steel are fixed. In the part spaced apart from the part (fixed position) in the longitudinal direction, the steel sheet pile and the H shape are driven by driving a wedge piece between the bending correction jig fixed to the steel sheet pile and the side surface of the H shape steel. The steel may be deformed in opposite directions.
In the manufacturing method of the steel material for underground underground walls, the H-shaped steel arranged on the web portion of the steel sheet pile is partially fixed to the steel sheet pile, and the steel sheet pile and the H-shaped steel are fixed. In a portion spaced in the longitudinal direction from the portion (fixed position), a wedge piece is driven between the bend correction jig fixed to the steel sheet pile and the side surface of the H-shaped steel, and the warp fixed to the steel sheet pile The steel sheet pile and the H-shaped steel may be deformed in opposite directions by driving another wedge piece between the straightening jig and the inner surface of one flange portion of the H-shaped steel.
In the method for manufacturing the steel material for the underground continuous wall, the wedge piece may be driven multiple times so as to be separated from the fixing portion (fixed position) of the steel sheet pile and the H-shaped steel in the longitudinal direction. .
In the method of manufacturing the steel material for continuous underground wall, after the H-shaped steel is fixed to the steel sheet pile at the portion where the wedge piece is driven, the bending correction jig and / or the warp correction jig is The bend correction jig and / or the warp correction jig removed from the steel sheet pile may be used when the wedge piece is driven next.

  According to the present invention, in the steel material for underground continuous wall in which a steel sheet pile having a substantially hat-shaped cross section and an H-shaped steel are combined, by reducing the bending and warping of the steel sheet pile after the assembly, It is possible to provide a method for manufacturing a steel material for underground continuous walls that can suppress the occurrence of straightening work and can facilitate on-site work without depending on the skill of a skilled worker. Therefore, industrial applicability is great.

DESCRIPTION OF SYMBOLS 1 Steel material for underground continuous walls 5 Underground continuous wall body 10 Steel sheet pile 11 Web part 12 Flange part 13 Arm part 14 Joint part 20 H-section steel 21 Web part 22, 23 Flange part 27 Fillet weld 31 Bend correction jig 33 Warpage Correction Jig 35 Bend Correction Wedge Piece 37 Warpage Correction Wedge Piece 41 Point Welding 43 Fixed Part (Fixed Position)
50 Z-type steel sheet pile 51 Web part 52 Arm part

Claims (12)

H-section steel has a bend in the opposite direction to the bend of the steel sheet pile or a smaller bend in the same direction,
A facing step of facing the flange portion of the H-beam with the web portion of the steel sheet pile;
A first fixing step of fixing the steel sheet pile and the H-shaped steel at a first fixing position;
A bending correction step of correcting the bending in the width direction of the steel sheet pile and the bending in the width direction of the H-shaped steel by deforming the steel sheet pile and the H-shaped steel;
A second fixing step of fixing the steel sheet pile and the H-shaped steel at a second fixing position spaced from the first fixing position in the longitudinal direction of the steel sheet pile;
A welding step of welding the steel sheet pile and the H-shaped steel along the longitudinal direction of the steel sheet pile;
Comprising :
After performing the first fixing step and performing the bending correction step and the second fixing step a plurality of times so as to be separated from the first fixing position in the longitudinal direction of the steel sheet pile, the welding step is performed. A method for producing a steel material for underground continuous walls characterized by the above. The bending correction process includes:
A first bending correction jig attaching step of attaching a first bending correction jig to the steel sheet pile at a position spaced from the first fixing position in the longitudinal direction of the steel sheet pile;
A first bending correction wedge piece driving step of driving a first bending correction wedge piece between the first bending correction jig and the side surface of the H-shaped steel;
The manufacturing method of the steel materials for underground continuous walls of Claim 1 characterized by the above-mentioned. The said 1st bending correction jig | tool is attached to the said steel sheet pile by welding. The manufacturing method of the steel materials for underground continuous walls of Claim 2 characterized by the above-mentioned. A second bending correction jig attaching step of attaching a second bending correction jig to the steel sheet pile at a position spaced in the longitudinal direction of the steel sheet pile from the position where the first bending correction jig is attached;
A second bending correction wedge piece driving step of driving a second bending correction wedge piece between the second bending correction jig and the side surface of the H-shaped steel;
The manufacturing method of the steel material for underground continuous walls of Claim 2 further equipped with these. The method for manufacturing a steel material for underground continuous wall according to claim 4, wherein the second bending correction jig is the first bending correction jig removed from the steel sheet pile. The H-shaped steel has a warp in the opposite direction to the warp of the steel sheet pile or a smaller warp in the same direction,
It further comprises a warp correction step of correcting the warp in the thickness direction of the steel sheet pile and the warp in the thickness direction of the H-shaped steel by deforming the steel sheet pile and the H-shaped steel. The manufacturing method of the steel materials for underground continuous walls as described in any one of Claims 1-5. The warpage correction process includes:
A first warp correction jig attaching step of attaching a first warp correction jig to the steel sheet pile at a position spaced from the first fixed position in the longitudinal direction of the steel sheet pile;
A first warp correction wedge piece driving step of driving a first warp correction wedge piece between the first warp correction jig and the upper surface of the flange portion of the H-shaped steel;
The manufacturing method of the steel materials for underground continuous walls of Claim 6 characterized by the above-mentioned. The method for manufacturing a steel material for an underground continuous wall according to claim 7, wherein the first warp correction jig is attached to the steel sheet pile by welding. A second warp correction jig attaching step of attaching a second warp correction jig to the steel sheet pile at a position spaced in the longitudinal direction of the steel sheet pile from a position where the first warp correction jig is attached;
A second warp correction wedge piece driving step of driving a second warp correction wedge piece between the second warp correction jig and the upper surface of the flange portion of the H-shaped steel;
The manufacturing method of the steel materials for underground continuous walls of Claim 7 further provided with these. The method for producing a steel material for underground continuous wall according to claim 9, wherein the second warp correction jig is the first warp correction jig removed from the steel sheet pile. The said steel sheet pile is comprised from two Z-type steel sheet piles connected so that it might become a hat-type steel sheet pile or a cross-section substantially hat-shaped shape, The manufacture of the steel materials for underground continuous walls of Claim 1 characterized by the above-mentioned. Method. The first fixing step includes
Fixing a warp correction jig for fixing to the steel sheet pile;
Driving a fixing wedge piece between the fixing warp correction jig and the flange portion of the H-shaped steel;
The manufacturing method of the steel materials for underground continuous walls of Claim 1 characterized by the above-mentioned.

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