JPWO2019031494A1 - Steel pipe sheet pile and composite wall body including the steel pipe sheet pile - Google Patents

Abstract

The steel pipe sheet pile (20) includes a steel pipe body (21) and a connecting member (22) extending in the longitudinal direction of the steel pipe body (21). The connecting member (22) defines a hollow portion (221) extending in the longitudinal direction and a slit (222) extending in the longitudinal direction and forming a boundary surface (222S) between the hollow portion (221) and the outside. The surface (222S) is perpendicular to the longitudinal direction with respect to the perpendicular (221E) in the direction (221D) from the center (221C) of the hollow portion (221) to the outside through the center of the slit (222). Is leaning.

Description

  The present technology relates to a steel pipe sheet pile and a synthetic wall body including the steel pipe sheet pile.

  A composite wall body that combines steel pipe sheet pile and steel sheet pile is known as a structure that can improve the sectional performance per weight of the wall body by combining the high sectional performance of the steel pipe sheet pile and the lightness of the steel sheet pile. Has been. When constructing such a composite wall body, for example, steel pipe sheet piles are first driven into the ground at a predetermined interval, and then steel sheet piles are driven between the steel pipe sheet piles. At this time, it is necessary to drive the steel sheet pile joints (interlocks) while engaging with the connecting members of the steel sheet pile, but in the prior art, for example, like the composite wall body 8 shown in FIG. The connecting member 82 having the same shape as the joint 11 of the steel sheet pile 10 was attached to the steel pipe body 81. In this case, since the position of the connecting member 82 of the steel pipe sheet pile 80 already placed in the ground and the position of the joint 11 of the steel sheet pile 10 to be placed later need to be accurately aligned, the construction is easy. is not.

  Therefore, in Patent Document 1, for example, like a synthetic wall body 9 shown in FIG. 15, a tubular connecting member 92 extending in the longitudinal direction is attached to a steel pipe main body 91 of a steel pipe sheet pile 90, and a slit 922 formed in the tubular connecting member 92 is attached to the slit 922. A technique for engaging the widthwise end portions of the steel sheet pile 10 has been proposed. In this case, even if the steel sheet pile 10 is slightly displaced in the width direction during driving, the engagement is maintained by the joint 11 of the steel sheet pile 10 located inside the tubular connecting member 92 functioning as a retainer. In the composite wall body 9, as described above, the construction error in the width direction of the steel sheet pile 10 is allowable to some extent, so that the construction is easier than in the case of the above-mentioned conventional technique. Patent Literature 2 and Patent Literature 3 similarly describe a technique relating to a steel pipe sheet pile having a tubular connecting member.

Japanese Patent No. 4998646 JP, 2016-44502, A JP, 2016-113750, A

  However, when the end portion including the joint 11 of the steel sheet pile 10 is engaged with the slit 922 formed in the tubular connecting member 92 like the synthetic wall body 9 shown in FIG. 15, for example, as shown in FIG. The sheet pile 10 may rotate. A pressure P such as earth pressure or water pressure acts on the composite wall body 9 in the wall thickness direction, but in the case of the illustrated example, the edges 923A and 923B of the tubular connecting member 92 on both sides of the slit 922 serve as fulcrums. Since the means for preventing the rotation of the steel sheet pile 10 is not particularly provided, there is a possibility that the composite wall body 9 is deformed when the steel sheet pile 10 rotated around the end portion is projected.

  Therefore, the present invention, in a synthetic wall body including a steel pipe sheet pile and a steel sheet pile, while allowing a certain degree of construction error when placing the steel sheet pile, it is possible to prevent the rotation of the steel sheet pile, new and improved An object of the present invention is to provide a steel pipe sheet pile and a synthetic wall body including the steel pipe sheet pile.

A steel pipe sheet pile according to an aspect of the present invention includes a steel pipe main body and a connecting member extending in the longitudinal direction of the steel pipe main body. The connecting member defines a hollow portion that extends in the longitudinal direction and a slit that extends in the longitudinal direction and forms a boundary surface between the hollow portion and the outside, and the boundary surface is a hollow portion in a cross section perpendicular to the longitudinal direction. It is inclined with respect to the perpendicular line that goes from the center to the outside through the center of the slit.
According to the above configuration, the direction from the center of the hollow portion to the outside through the center of the slit, that is, when the steel pipe sheet pile is combined with the steel sheet pile to form the composite wall body, the steel sheet pile is connected from the connecting member of the steel pipe sheet pile. The edges on both sides of the slit of the connecting member face the steel sheet pile at different positions in the direction in which it is intended to extend. Thereby, the rotation of the steel sheet pile due to the moment generated by the pressure acting on the steel sheet pile can be prevented.

  In the above steel pipe sheet pile, the connecting member may have a spiral shape having a cutout portion in the turning direction in a cross section perpendicular to the longitudinal direction, and the cutout portion may define a slit. Alternatively, the connecting member includes a pair of arms extending in a direction perpendicular to the longitudinal direction in a direction away from the steel pipe body, and the hollow portion is defined between the pair of arms, and the hollow portion includes The slits may be defined by the tips of a pair of arms that face each other while staggering in the direction from the center to the outside through the center of the slit.

  Further, in the above-mentioned steel pipe sheet pile, a rib groove may be formed on the surface of the connecting member, the rib groove extending in a direction having an angle with respect to the longitudinal direction.

  In the above steel pipe sheet pile, among the edge portions or the tip portions located on both sides of the slit, the edge portion closer to the center of the hollow portion or the corner portion on the side closer to the center of the hollow portion, and the center of the hollow portion. A pair of sides that are parallel to the direction from the center of the hollow part to the outside through the center of the slit, with the corners on the side farther from the center of the hollow part of the end or the distal end from the center of the hollow part In a rectangle composed of a pair of sides perpendicular to the direction, the relationship a ≦ b may be established between the length a of the side perpendicular to the direction and the length b of the side parallel to the direction.

  Further, the above-mentioned steel pipe sheet pile includes a pair of connecting members arranged on both sides in the width direction of the steel pipe main body, and the angles at which the boundary surfaces of the pair of connecting members are inclined with respect to the perpendicular are opposite to each other. May be.

  A composite wall body according to another aspect of the present invention includes a steel pipe sheet pile according to any one of the above configurations, and a steel sheet pile connected to the steel pipe sheet pile. The widthwise end of the steel sheet pile is inserted into the slit.

  In the above synthetic wall body, the boundary surface formed by the slit of the steel pipe sheet pile is a steel perpendicular to the longitudinal direction, in the direction perpendicular to the direction from the center of the hollow portion to the outside through the center of the slit, steel. It may be tilted in the direction opposite to the moment generated by the pressure acting on the sheet pile.

  Further, in the above synthetic wall body, a retaining portion may be formed at an end portion in the width direction of the steel sheet pile.

  According to the present invention, in a composite wall body including a steel pipe sheet pile and a steel sheet pile, it is possible to prevent the rotation of the steel sheet pile while allowing a certain amount of construction error when the steel sheet pile is placed.

It is a perspective view which shows some synthetic wall bodies containing the steel pipe sheet pile which concerns on the 1st Embodiment of this invention. It is an expanded sectional view of the connection member of the steel pipe sheet pile shown in FIG. It is a figure for demonstrating the principle which the connection member of the steel pipe sheet pile which concerns on the 1st Embodiment of this invention prevents rotation of a steel sheet pile. It is a figure for demonstrating the principle which the connection member of the steel pipe sheet pile which concerns on the 1st Embodiment of this invention prevents rotation of a steel sheet pile. It is a figure for demonstrating the principle which the connection member of the steel pipe sheet pile which concerns on the 1st Embodiment of this invention prevents rotation of a steel sheet pile. It is a figure which shows the state which the connection member shown in FIG. 2 supports the edge part of a steel sheet pile in a mutually different position. It is sectional drawing which shows arrangement | positioning of the connection member of the steel pipe sheet pile in 1st Embodiment. It is a figure for demonstrating the shape of the connection member of the steel pipe sheet pile which concerns on the 1st Embodiment of invention from another viewpoint. It is an expanded sectional view of a connecting member of a steel pipe sheet pile concerning a 2nd embodiment of the present invention. It is sectional drawing which shows some synthetic wall bodies containing the steel pipe sheet pile which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows arrangement | positioning of the connection member of the steel pipe sheet pile in 3rd Embodiment. It is a perspective view which shows a part of synthetic wall body containing the steel pipe sheet pile which concerns on the 4th Embodiment of this invention. It is an expanded sectional view of a connecting member of a steel pipe sheet pile concerning a 5th embodiment of the present invention. It is sectional drawing which shows arrangement | positioning of the connection member of the steel pipe sheet pile in 5th Embodiment. It is a figure for demonstrating the shape of the connection member of the steel pipe sheet pile which concerns on the 5th Embodiment of this invention from another viewpoint. It is sectional drawing which shows some synthetic wall bodies containing the conventional steel pipe sheet pile. It is sectional drawing which shows some synthetic wall bodies containing the conventional steel pipe sheet pile. It is an expanded sectional view of the connection member of the steel pipe sheet pile shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted.

(First embodiment)
FIG. 1 is a perspective view showing a part of a synthetic wall body including a steel pipe sheet pile according to a first embodiment of the present invention. The composite wall body 1 according to the present embodiment is constructed, for example, as a retaining wall or a water blocking wall, and a pressure P such as earth pressure or water pressure acts in the wall thickness direction (y direction in the drawing). As shown in FIG. 1, the composite wall body 1 includes a hat-shaped steel sheet pile 10 and a steel pipe sheet pile 20. The steel sheet pile 10 includes a joint 11, a flange 12, a web 13, and an arm 14. The arms 14 are located at both ends of the steel sheet pile 10 in the width direction (x direction in the drawing), and the joints 11 are formed at the ends of the arms 14. The steel pipe sheet pile 20 includes a steel pipe main body 21 and a connecting member 22 extending in the longitudinal direction of the steel pipe main body 21 (z direction in the drawing). The steel pipe body 21 and the connecting member 22 are joined to each other by, for example, welding. The connecting member 22 defines a hollow portion 221 extending in the longitudinal direction and a slit 222, and the arm 14 of the steel sheet pile 10 is inserted into the slit 222. At this time, the joint 11 formed at the end of the arm 14 is located in the hollow portion 221 of the connecting member 22. As will be described later, by making the opening width B of the slit 222 smaller than the width h of the joint 11, the joint 11 functions as a retaining member, and the engagement of the connecting member 22 of the steel pipe sheet pile 20 with the steel sheet pile 10 is maintained. To be done.

  FIG. 2 is an enlarged cross-sectional view of the connecting member of the steel pipe sheet pile shown in FIG. In the cross section shown in FIG. 2 (cross section perpendicular to the longitudinal direction of the steel pipe body 21), the connecting member 22 has a (imperfect) spiral shape having a cutout portion in the turning direction. A spiral is defined herein as a curve that moves away from the center as it turns. In the illustrated example, the edge portion 223A of the connecting member 22 is the start point of the spiral, and the edge portion 223B is the end point of the spiral. Further, the fact that the spiral has a missing portion in the turning direction means that the spiral does not make one round around the center. When viewed from the center of the spiral, there is a gap between the edge portion 223A and the edge portion 223B, that is, a missing portion, and this missing portion defines the slit 222.

  In the present specification, unless otherwise stated, the steel pipe sheet pile and the steel sheet pile forming the composite wall body will be described in cross-sectional shape before being driven into the ground. As described above, since earth pressure or water pressure acts on the composite wall body in the wall thickness direction, the shape and positional relationship of the steel pipe sheet pile and the steel sheet pile may change after driving due to these pressures. . Conversely, the sectional shapes of the steel pipe sheet pile and the steel sheet pile which are described in the present specification without any particular reference are basically the shapes in the state before the above-mentioned pressure acts. Further, in the state before the steel pipe sheet pile and the steel sheet pile are driven into the ground, the steel pipe sheet pile and the steel sheet pile have a cross-sectional shape as illustrated and described over the entire length in the longitudinal direction. However, it is possible that the dimensions of the details of the cross-sectional shape may change in the longitudinal direction in order to correct the positional deviation that occurs during casting, for example. Further, since the earth pressure and water pressure acting after the driving may differ depending on the depth, the cross-sectional shape of the steel pipe sheet pile and the steel sheet pile after the driving may be unevenly deformed in the longitudinal direction. However, as long as the cross-sectional shape before casting is within the scope of the above claims (for example, without receiving a large earth pressure or water pressure that causes the synthetic wall body to collapse), the steel pipe sheet pile and the synthetic wall body after casting are excluded. do not have to.

  In the cross-sectional shape of the connecting member 22 as described above, the slit 222 forms a boundary surface 222S between the hollow portion 221 surrounded by the connecting member 22 and the outside of the connecting member 22. In the illustrated example, the boundary surface 222S is a surface connecting between the plate thickness center of the edge portion 223A (center of the edge portion cross section) and the plate thickness center of the edge portion 223B (center of the edge portion cross section). In the present embodiment, the boundary surface 222S is inclined from the center 221C of the hollow portion 221 by an angle θ with respect to the perpendicular 221E of the direction 221D that goes outward through the center of the slit 222 in the cross section. Thereby, in the direction 221D, that is, the direction in which the steel sheet pile 10 is intended to extend from the connecting member 22, the edge portion 223A and the edge portion 223B are different from each other in the arm 14 (or the joint) of the steel sheet pile 10. Face 11). Therefore, as will be described later, when the moment M is generated by the pressure P acting on the steel sheet pile 10, the edge 223A and the edge 223B contact the steel sheet pile 10 at two points, so that the rotation of the steel sheet pile 10 is prevented. Can be suppressed. The angle θ is preferably, for example, 20 ° or more, 25 ° or more, 30 ° or more, or 33 ° or more. It is not necessary to set the upper limit of the angle θ, but the definition does not exceed 90 °. If necessary, the angle θ may be 80 ° or less or 70 ° or less.

  The center 221C of the hollow portion 221 is the centroid of the cross-sectional shape of the hollow portion 221 defined by the connecting member 22 and the boundary surface 222S. Here, the centroid of the cross-sectional shape is also the center of gravity of the cross-section.

  Further, in the above example, the direction 221D in which the steel sheet pile 10 is intended to extend from the connecting member 22 is substantially the same as the direction in which the steel sheet pile 10 extends from the connecting member 22 in, for example, design drawings. Match. Alternatively, when the hat-shaped steel sheet pile 10 is used, the steel sheet pile 10 extends from the connecting member 22 in the width direction of the composite wall body 1 (the x direction in the drawing). The x direction in the figure) substantially coincides with the direction 221D.

  Here, in the case of the tubular connecting member 92 of the conventional steel pipe sheet pile 90 described with reference to FIGS. 15 and 16 above, the boundary surface 922S formed by the slit 922 has the slit 922 in the cross section from the center 921C of the hollow portion 921. To the outside through the center of the, i.e., the steel sheet pile 10 substantially coincides with the perpendicular 921E of the direction 921D intended to extend from the tubular connecting member 92. In this case, the edges 923A and 923B of the tubular connection member 92 face the arm 14 of the steel sheet pile 10 from both sides at the same position in the direction 921D. Therefore, when the moment M is generated by the pressure P acting on the steel sheet pile 10, the edges 923A and 923B come into contact with the steel sheet pile 10 at substantially the same point or at points close to each other. Rotation is not prevented.

  As the connecting member 22 of the steel pipe sheet pile 20 according to the present embodiment, for example, a tubular member having a slit similar to the tubular connecting member 92 described with reference to FIG. 15 above is prepared, and only one side of the slit is inside. It may be formed by a crushing process. In this case, the crushed side of the slit becomes the edge portion 223A (closer to the center of the hollow portion) in the example shown in FIG. Alternatively, the connecting member 22 may be formed by preparing a tubular member similarly having a slit and pulling only one side of the slit to the outside. In this case, the side where the slit is pulled out becomes the edge portion 223B (away from the center of the hollow portion) in the example shown in FIG. As a non-limiting example, a tubular member having an arc-shaped cross section in which a slit is formed is prepared, and a long diameter of the cross section is formed by drawing out only one side of the slit (in the example of FIG. 2, the connecting member 22 and the steel pipe body 21 are The connecting member 22 can be formed by enlarging the length from the joint portion to the outer corner portion of the edge portion 223A) to, for example, about 1.07 times the diameter of the original arcuate cross section. As still another example, the connecting member 22 may be formed by preparing two (groove-shaped) members having two semicircular cross sections having different radii and joining one end of each semicircular cross section. Good. The connecting member 22 is joined to the steel pipe body 21 by welding or the like after being formed into a spiral cross section by the above-described process. Alternatively, after joining the tubular member to the steel pipe main body 21, the tubular member may be formed into the connecting member 22 having a spiral cross section by the above-described steps. There may be a plate-shaped connecting member between the tubular member and the steel pipe body 21.

  The shortest distance between the edge 223A and the edge 223B (for example, in the case of FIG. 2, the corner of the edge 223A farther from the center of the hollow portion and the corner of the edge 223B closer to the center of the hollow portion). Is defined as the opening width B of the slit 222. The opening width B is larger than the plate thickness t of the steel sheet pile 10. The lower limit of the opening width B may be 1.2t, 1.4t, 1.6t or 1.8t in relation to the plate thickness t of the steel sheet pile 10. Similarly, the upper limit of the opening B may be 3.5t, 3.0t, or 2.5t. In relation to the width h of the joint 11 of the steel sheet pile 10, the opening width B may be smaller than h and may be 0.9h or less, 0.8h or less, or 0.7h or less. On the other hand, other than the relationship with the plate thickness t or the width h, a preferable range of the opening width B of the slit 222 will be described below. The lower limit of the opening B may be 10 mm, 13 mm, 15 mm, 17 mm or 20 mm, and the upper limit of the opening B may be 40 mm, 35 mm, 30 mm or 25 mm.

  FIG. 3 is a plan view schematically showing the connecting member of the steel pipe sheet pile and the steel sheet pile for explaining the principle that the connecting member of the steel pipe sheet pile according to the first embodiment of the present invention prevents the steel sheet pile from rotating. Is. The thin line in FIG. 3 indicates the moment M applied to the connecting member and the steel sheet pile 10. FIG. 3A shows an example of a connecting member that does not restrain the rotation of the steel sheet pile 10, specifically, the tubular connecting member 92 described above with reference to FIGS. 15 and 16. In this case, the steel sheet pile 10 is freely rotated by the tubular connecting member 92, and the widthwise end portion of the steel sheet pile 10 is supported by the one edge portion 923B as shown in FIG. The moment M generated by the applied pressure P is 0 at the tubular connecting members 92 on both sides in the width direction (x direction in the drawing) of the steel sheet pile 10 and becomes maximum at the central portion of the steel sheet pile 10. As a result, the steel sheet pile 10 is deformed so as to largely project at the central portion. For example, when a plurality of steel sheet piles 10 are connected to each other by a joint 11 in the central portion and arranged between the steel pipe sheet piles 90 as in the example of FIG. The above-mentioned deformation is not preferable from the viewpoint of structural stability because the joint 11 is heavily loaded.

  On the other hand, FIG. 3B shows an example of the connecting member that restrains the rotation of the steel sheet pile 10, specifically, the connecting member 82 described above with reference to FIG. 14. In this case, since the connecting member 82 bears the reaction force moment, the moment M at the central portion of the steel sheet pile 10 becomes smaller than that in the example of FIG. 3A. Therefore, in the example of FIG. 3B, the protrusion of the central portion of the steel sheet pile 10 is smaller than that in the example of FIG. 3A. However, in this case, since the connecting member 82 bears the reaction force moment, the member of the connecting member 82 may be deformed or damaged. Further, when the connecting member 82 having the shape as shown in FIG. 14 is used, the construction error of the steel sheet pile 10 needs to be strictly controlled, and the construction is not easy, as described above.

  FIG. 3C shows two fulcrums that do not directly restrain the rotation of the steel sheet pile 10, specifically, the edges 223A and 223B of the connecting member 22 described with reference to FIG. 2 as shown in FIG. The example which supports the edge part of the width direction of the steel sheet pile 10 in a mutually different position is shown in FIG. In this case, since the edge portions 223A and 223B bear the reaction force moment, the moment M at the central portion of the steel sheet pile 10 is smaller than that in the example of FIG. 3A and slightly larger than that of the example of FIG. 3B. It can be reduced to a certain degree. Therefore, also in the example of FIG. 3C, the protrusion of the central portion of the steel sheet pile 10 is smaller than that of the example of FIG. 3A. On the other hand, since the edge portions 223A and 223B do not directly restrain the rotation of the steel sheet pile 10 (that is, allow the rotation of the steel sheet pile 10 to some extent), the members may be deformed or damaged. Much smaller than the example of FIG. 3B. Further, in the connecting member 22 of the steel pipe sheet pile 20 according to the present embodiment, as with the tubular connecting member 92 in the example of FIG. 15, a construction error at the time of driving the steel sheet pile 10 in the width direction is allowed to some extent.

  The effect of the present embodiment as described above is obtained by an appropriate positional relationship between the spiral cross section of the connecting member 22 as shown in FIG. 2 and the pressure P acting on the steel sheet pile 10. Specifically, in the example of FIG. 2, the spiral cross section of the connecting member 22 is arranged so that the boundary surface 222S inclines in a direction opposite to the moment M generated by the pressure P with respect to the perpendicular 221E. As a result, the edge portion 223B, which can be a fulcrum on the side where the pressure P does not act, is located farther from the center 221C of the hollow portion 221, than the edge portion 223A, which can be a fulcrum on the side where the pressure P acts. . Therefore, as shown in FIG. 3C, the moment M generated by the pressure P can be reduced by the support at the two points by the edge portions 223A and 223B. In order to obtain such an effect, as shown in FIGS. 2 and 5, each of the pair of connecting members 22 arranged on both sides in the width direction (x direction in the drawing) of the steel pipe body 21 in the steel pipe sheet pile 20. In, the angle θ at which the boundary surface 222S is inclined with respect to the perpendicular 221E is opposite to each other. Specifically, in the connecting member 22 (same as that shown in FIG. 2) shown on the right side of the steel pipe main body 21 in FIG. 5, the angle θ is counterclockwise, while on the left side of the steel pipe main body 21. The angle θ of the connecting member 22 shown is clockwise.

  In the two connecting members attached to both sides of the steel sheet pile in the width direction, the edge portion closer to the center of the hollow portion and the edge portion farther from the hollow portion are in the wall thickness direction (direction perpendicular to the width direction. When it is on the same side in the y direction), either one of the continuous rare members cannot bear the reaction moment as shown in FIG. 3C. Therefore, as shown in FIG. 5, the edges of the two connecting members, which are attached to both sides of the steel sheet pile in the width direction, closer to the center of the hollow portion, are located in the wall thickness direction of the steel sheet pile (in the drawing, in the drawing). on the same side). Similarly, the edges farther from the center of the hollow portion are on the same side in the wall thickness direction of the steel sheet pile.

  In addition, in the synthetic wall body 1 as described above with reference to FIG. 1, the edge portions 223A and 223B of the connecting member 22 do not necessarily contact the steel sheet pile 10 from the beginning to form the fulcrum of the steel sheet pile 10. May be. Since the synthetic wall body 1 is driven into the ground, for example, when the earth pressure and the water pressure are relatively small, the position of the steel sheet pile 10 is in a state where the steel sheet pile 10 does not come into contact with either of the edge portions 223A and 223B. It may be maintained. In this case, for example, at the time when the earth pressure or the water pressure increases after the completion of the composite wall body 1 and a large moment M acts on the steel sheet pile 10, at least one of the edge portions 223A and 223B acts on the steel sheet pile 10. The steel sheet pile 10 is contacted to form a fulcrum. Alternatively, at the time of driving the composite wall body 1, specifically, for example, when the arm 14 of the steel sheet pile 10 is inserted into the slit 222, at least one of the edge portions 223A and 223B is in contact with the steel sheet pile 10. Good.

  In the steel pipe sheet pile 20 according to the first embodiment of the present invention as described above, since the widthwise end of the steel sheet pile 10 is inserted into the slit 222 of the connecting member 22, the steel sheet pile 10 has a structure. It is possible to allow a certain amount of construction error during placement. Further, in the steel pipe sheet pile 20, a boundary surface 222S formed by the slit 222 between the hollow portion 221 of the connecting member 22 and the outside is directed to the outside 221D from the center of the hollow portion 221 through the center of the slit 222 in the cross section. Is inclined with respect to the vertical line 221E. Thereby, in the direction 221D, that is, in the direction in which the steel sheet pile 10 is intended to extend from the connecting member 22 when the composite wall body 1 is configured, the edge portions 223A and 223B are different from each other in the steel sheet pile 10. opposite. Therefore, the rotation of the steel sheet pile 10 can be prevented when the moment M is generated by the pressure P acting on the steel sheet pile 10.

FIG. 6: is a figure for demonstrating the shape of the connection member of the steel pipe sheet pile which concerns on the 1st Embodiment of this invention from another viewpoint. Figure 6 is an enlarged sectional view of the connecting member 22 of the same steel sheet pile 20 and FIG. 2, is omitted a line indicating, for example, boundary 222S, 2 one edge 223A in place, the corners of 223B _E 1, E _A rectangle R is shown, which has _two opposite vertices and a pair of sides parallel to the direction 221D and a pair of sides perpendicular to the direction 221D. Here, the corner portion E ₁ is a corner portion of the edge portion 223A closer to the center 221C of the hollow portion 221 among the edge portions 223A and 223B. On the other hand, the corner portion E ₂ is a corner portion of the edge portion 223B farther from the center 221C of the edge portions 223A and 223B, which is farther from the center 221C. When such a rectangle R is defined, the relationship of a ≦ b may be established between the side length a of the rectangle R perpendicular to the direction 221D and the side length b of the rectangle R parallel to the direction 221D. preferable. If necessary, a <b may be set.

(Second embodiment)
FIG. 7: is an expanded sectional view of the connection member of the steel pipe sheet pile which concerns on the 2nd Embodiment of this invention. In this embodiment, the structure of the steel pipe sheet pile 20 including the steel pipe main body 21 and the connecting member 22 is the same as that of the first embodiment. As a difference from the first embodiment, in the present embodiment, a bent portion 15 is provided at the end of the arm 14 of the steel sheet pile 10A instead of the joint 11. The bent portion 15 functions as a retaining member similarly to the joint 11 of the example shown in FIG. The portion that functions as a retaining member is not limited to the joint 11 in the first embodiment or the bent portion 15 in the present embodiment, and the widthwise end of the steel sheet pile is in the sheet thickness direction of the steel sheet pile (that is, Any shape may be used as long as it is a portion that is expanded or bent in the wall thickness direction of the composite wall body. In this specification, such a portion is also referred to as a "prevention portion". Even in such a case, the pair of edges 223A and 223B on both sides of the slit 222 face the arm 14 (or the bent portion 15) of the steel sheet pile 10A at different positions, and when the moment M is generated, the steel is moved. The rotation of the sheet pile 10A can be prevented. The steel sheet pile 10A including the bent portion 15 is manufactured, for example, by bending a steel sheet by cold forming. In the case of this embodiment, since the bent portion 15 functions as a retainer, the width h of the bent portion (width in the length direction of the steel sheet pile and the direction perpendicular to the width method (the y direction in the drawing)) is slit. It does not need to be larger than the opening width B of 222.

(Third Embodiment)
FIG. 8: is sectional drawing which shows some synthetic wall bodies containing the steel pipe sheet pile which concerns on the 3rd Embodiment of this invention. In the present embodiment, the respective structures of the steel pipe body 21 and the connecting member 22 of the steel pipe sheet pile 20B are the same as those in the first embodiment described above. As a difference from the first embodiment, since the U-shaped steel sheet pile 10U is used in the present embodiment, the direction in which the slit 222 of the connecting member 22 is directed is different from that in the first embodiment. Specifically, also in the present embodiment, the boundary surface 222S formed by the slit 222 is inclined by the angle θ in the direction opposite to the moment M with respect to the perpendicular 221E in the direction 221D. However, in the present embodiment, the direction 221D, that is, the direction in which the steel sheet pile 10U is intended to extend from the connecting member 22, is inclined with respect to the width direction of the steel sheet pile 10U (x direction in the drawing). . Therefore, the direction of the boundary surface 222S determined based on the direction 221D, that is, the direction in which the slit 222 is directed is also different from that in the first embodiment. The angle θ is preferably, for example, 20 ° or more, 25 ° or more, 30 ° or more, or 33 ° or more.

  As shown in FIGS. 8 and 9, also in the steel pipe sheet pile 20B according to the present embodiment, the boundary surface is formed in each of the pair of connecting members 22 arranged on both sides in the width direction (x direction in the drawing) of the steel pipe body 21. The angles θ with which the 222S is inclined with respect to the perpendicular 221E are opposite to each other. Specifically, in the connecting member 22 (same as that shown in FIG. 8) shown on the right side of the steel pipe main body 21 in FIG. 9, the angle θ is counterclockwise, while on the left side of the steel pipe main body 21. The angle θ of the connecting member 22 shown is clockwise.

  Also in the present embodiment, the pair of edges 223A and 223B on both sides of the slit 222 face the arm 14 (or the joint 11) of the steel sheet pile 10U at different positions, so that the steel sheet pile when the moment M occurs. Rotation of 10 U is prevented. Similarly, in another embodiment, for steel sheet piles having various cross-sectional shapes, such as a Z-shaped steel sheet pile and a straight steel sheet pile, the slit 222 is directed in an appropriate direction to prevent the steel sheet pile from rotating due to the moment M. be able to.

(Fourth Embodiment)
FIG. 10: is a perspective view which shows some synthetic wall bodies containing the steel pipe sheet pile which concerns on the 4th Embodiment of this invention. As shown in FIG. 10, the structure of the composite wall body 4 according to the present embodiment is the same as the first embodiment except that the rib groove 224 is formed on the surface of the connecting member 22C of the steel pipe sheet pile 20C. Is the same as. The rib groove 224 extends in a direction at an angle with respect to the longitudinal direction of the connecting member 22C (z direction in the drawing). For example, the rib groove 224 may be formed in a direction perpendicular to the longitudinal direction of the connecting member 22C. Alternatively, the rib groove 224 may be formed in a direction inclined with respect to the longitudinal direction of the connecting member 22C. In this case, the rib groove 224 forms a part of the spiral that advances in the longitudinal direction of the connecting member 22C.

  An example in which such a rib groove 224 is applied to the tubular connecting member 92 as described with reference to FIG. 15 is described in, for example, JP-A-2016-44502. JP-A-2016-44502 describes various rib groove shapes, but the rib groove 224 in the present embodiment can also have various shapes. Since the cross-sectional rigidity of the connecting member 22 is improved by forming the rib groove 224, when the moment M is generated by the pressure P acting on the steel sheet pile 10, for example, the edge portion 223B constituting the fulcrum of the steel sheet pile 10 is applied. It is possible to prevent the slit 222 from being expanded by the reaction moment. In this embodiment, since a larger reaction force moment is applied to the edge portion 223B than to the edge portion 223A, the rib groove 224 is formed only on the side of the edge portion 223B, and the rib groove 224 is not formed on the side of the edge portion 223A. May be. Further, in order to strengthen the joint between the steel pipe body 21 and the connecting member 22 by welding or the like, the rib groove 224 may not be formed at the joint portion of the connecting member 22 and the steel pipe body 21.

(Fifth Embodiment)
FIG. 11: is an expanded sectional view of the connection member of the steel pipe sheet pile which concerns on the 5th Embodiment of this invention. In the present embodiment, the steel pipe sheet pile 30 includes a steel pipe main body 21 and a connecting member 32 extending in the longitudinal direction of the steel pipe main body 21 (z direction in the drawing). The steel pipe body 21 and the connecting member 32 are joined to each other by, for example, welding. In the cross section (cross section perpendicular to the longitudinal direction of the steel pipe body 21) shown in FIG. 11, the connecting member 32 includes a pair of arm portions 323A and 323B extending in a direction away from the steel pipe body 21. A hollow portion 321 is defined between the arms 323A and 323B. Further, the slit 322 is defined between the respective tip portions 324A and 324B of the arm portions 323A and 323B. As shown, the tip portions 324A, 324B are formed by bending the arm portions 323A, 323B so as to approach each other. The tip portions 324A and 324B face each other with the slit 322 in between, but they are different from each other in the direction 321D from the center 321C of the hollow portion 321 to the outside through the center of the slit 322. Here, the center 321C of the hollow portion 321 is the centroid of the hollow portion 321.

  Here, the amount of discrepancy D based on the center of the plate thickness of each of the tip portions 324A and 324B is 0.5t or more in relation to the plate thickness t of the steel sheet pile 10, for example, 0.5t ≦ D ≦ 1. It is preferably 5t. When this is applied to a general plate thickness t range of 10 mm to 20 mm, the discrepancy amount D has a lower limit of 5 mm, and preferably, for example, 5 mm ≦ D ≦ 30 mm. Further, the opening width B of the slit 322 (the shortest distance between the tip portion 324A and the tip portion 324B) is the same as the sheet thickness t of the steel sheet pile 10 and the width h of the joint 11 as described in the first embodiment. In this relationship, t <B <h, and when a general plate thickness t and width h are assumed, it is preferable that 16 mm ≦ B ≦ 40 mm, for example.

  Note that the illustrated shapes of the arm portions 323A and 323B and the distal end portions 324A and 324B are examples, and various other shapes are possible. For example, either or both of the arm portions 323A, 323B and the tip portions 324A, 324B may be formed in an arcuate cross-sectional shape having a curvature. In the illustrated example, the connecting member 32 further includes a bridge portion 325 for maintaining the distance between the arm portions 323A and 323B.

  In the cross-sectional shape of the connecting member 32 as described above, the slit 322 forms a boundary surface 322S between the hollow portion 321 and the outside. The boundary surface 322S is also a surface connecting the tip portions 324A and 324B. As illustrated, the boundary surface 322S is inclined by an angle θ with respect to a perpendicular 321E of a direction 321D that goes from the center 321C of the hollow portion 321 through the center of the slit 322 to the outside. Specifically, the boundary surface 322S is inclined with respect to the perpendicular 321E by an angle θ in the direction opposite to the moment M. Thereby, in the direction 321D, that is, in the direction in which the steel sheet pile 10 is intended to extend from the connecting member 32, the tip portion 324A and the tip portion 324B are located at positions different from each other, and the arm 14 (or the joint) of the steel sheet pile 10 is different. Face 11). Thereby, when the moment M is generated by the pressure P acting on the steel sheet pile 10, the tip portion 324A and the tip portion 324B contact the steel sheet pile 10 at two points, whereby the rotation of the steel sheet pile 10 can be prevented. . The angle θ is preferably, for example, 20 ° or more, 25 ° or more, 30 ° or more, or 33 ° or more.

  The connecting member 32 according to the present embodiment is provided, for example, as hot-pressed steel or the like formed by hot extrusion of steel. Since the hot stamped steel can be formed into any shape, it is not limited to the example shown in FIG. 11, and the connecting member can be formed into any shape that defines the hollow portion extending in the longitudinal direction and the slit. is there. The manufacturing method of the connecting member is not limited to hot extrusion, but may be cold extrusion, hot or cold bending, or the like.

  As shown in FIGS. 11 and 12, also in the steel pipe sheet pile 30 according to the present embodiment, the boundary surface is formed in each of the pair of connecting members 32 arranged on both sides in the width direction (x direction in the drawing) of the steel pipe body 21. The angles θ with which the 322S is inclined with respect to the perpendicular 321E are opposite to each other. Specifically, in the connecting member 32 (same as that shown in FIG. 11) shown on the right side of the steel pipe body 21 in FIG. 12, the angle θ is counterclockwise, while on the left side of the steel pipe body 21. With the connecting member 32 shown, the angle θ is clockwise. In other words, the edges closer to the center of the hollow portion of the two connecting members attached to both sides of the steel sheet pile in the width direction have the same side in the wall thickness direction of the steel sheet pile wall (the y direction in the drawing). It is in. Similarly, the edges farther from the center of the hollow portion are on the same side in the wall thickness direction of the steel sheet pile wall.

FIG. 13: is a figure for demonstrating the shape of the connection member of the steel pipe sheet pile which concerns on the 5th Embodiment of this invention from another viewpoint. Figure 13 is an enlarged sectional view of the connecting member 32 of the same steel sheet pile 30 and 11, is omitted a line indicating, for example, boundary 322S, instead 2 horns on the tip portion 324A, the corners of 324B _E 1, E _A rectangle R having _two opposite sides as vertices and having a pair of sides parallel to the direction 321D and a pair of sides perpendicular to the direction 321D is illustrated. Here, the corner portion E ₁ is a corner portion of the tip portion 324A closer to the center 321C of the hollow portion 321 among the tip portions 324A and 324B, on the side closer to the center 321C. On the other hand, the corner portion E ₂ is a corner portion of the tip portion 324B, which is farther from the center 321C, of the tip portions 324A and 324B, which is farther from the center 321C. When such a rectangle R is defined, the relationship of a ≦ b is established between the length a of the side of the rectangle R perpendicular to the direction 321D and the length b of the side parallel to the direction 321D.

  The preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, but the present invention is not limited to these examples. It is obvious that a person having ordinary knowledge in the field of the technology to which the present invention belongs can conceive various alterations or modifications within the scope of the technical idea described in claims. It is understood that these also belong to the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Synthetic wall body, 10 ... Steel sheet pile, 11 ... Joint, 12 ... Flange, 13 ... Web, 14 ... Arm, 15 ... Bending part, 20, 30 ... Steel pipe sheet pile, 21 ... Steel pipe main body, 22, 32 ... Connection Member, 221, 321 ... Hollow part, 222, 322 ... Slit, 222S, 322S ... Boundary surface, 223A, 223B ... Edge part, 224 ... Rib groove, 323A, 323B ... Arm part, 324A, 324B ... Tip part.

Claims (10)

A steel pipe sheet pile including a steel pipe body and a connecting member extending in the longitudinal direction of the steel pipe body,
The connecting member is
A hollow portion extending in the longitudinal direction,
A slit extending in the longitudinal direction and forming a boundary surface between the hollow portion and the outside,
In the cross section perpendicular to the longitudinal direction, the boundary surface is inclined with respect to a perpendicular line in a direction from the center of the hollow portion to the outside through the center of the slit. The connecting member has a spiral shape having a missing portion in the turning direction in a cross section perpendicular to the longitudinal direction,
The steel pipe sheet pile according to claim 1, wherein the missing portion defines the slit. The connecting member includes a pair of arm portions extending in a direction away from the steel pipe body in a cross section perpendicular to the longitudinal direction,
The hollow portion is defined between the pair of arms,
The steel pipe sheet pile according to claim 1, wherein the slits are defined by the tips of the pair of arms that are opposed to each other while staggering in the direction from the center of the hollow portion to the outside through the center of the slit.   The steel pipe sheet pile according to any one of claims 1 to 3, wherein a rib groove extending in a direction having an angle with respect to the longitudinal direction is formed on a surface of the connecting member.   Of the edge portions or tip portions located on both sides of the slit, the edge portion or tip portion closer to the center of the hollow portion, the corner portion on the side closer to the center of the hollow portion, and farther from the center of the hollow portion. A pair of edges parallel to the direction from the center of the hollow portion through the center of the slit to the outside, with the opposite edge or the corner portion of the distal end portion farther from the center of the hollow portion as the opposite vertex. In a rectangle composed of a side and a pair of sides perpendicular to the direction, the length a of the side perpendicular to the direction and the length b of the side parallel to the direction satisfy the relationship of a ≦ b. The steel pipe sheet pile according to any one of claims 1 to 4. Including a pair of the connecting members arranged on both sides in the width direction of the steel pipe body,
The steel pipe sheet pile according to any one of claims 1 to 5, wherein an angle at which the boundary surface inclines with respect to the perpendicular in each of the pair of the connecting members is opposite to each other. A composite wall body comprising the steel pipe sheet pile according to any one of claims 1 to 6, and a steel sheet pile connected to the steel pipe sheet pile,
A composite wall body in which an end portion in the width direction of the steel sheet pile is inserted into the slit.   The boundary surface, in a cross section perpendicular to the longitudinal direction, a moment generated by a pressure acting on the steel sheet pile with respect to a perpendicular line from the center of the hollow portion to the outside through the center of the slit. The synthetic wall body according to claim 7, which is inclined in a direction opposite to the direction.   The synthetic wall body according to claim 7, wherein a retaining portion is formed at an end portion in the width direction of the steel sheet pile.   The composite wall body according to claim 9, wherein a relationship of t <B <h is established between a plate thickness t of the steel sheet pile, a width h of the retaining portion, and an opening width B of the slit.

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