HK1251271B - Vertical joint structure of hat-type steel sheet piling, vertically joined hat-type steel sheet piling unit, and steel wall - Google Patents

Description

Vertical connection structure of hat-shaped steel sheet pile, vertical connection hat-shaped steel sheet pile unit and steel wall

Technical Field

The present invention relates to a vertical connection structure of hat-type steel sheet piles connecting a plurality of hat-type steel sheet piles in the material axial direction, a vertical connection hat-type steel sheet pile unit having the vertical connection structure, and a structural wall obtained by connecting the vertical connection hat-type steel sheet pile units in the wall width direction.

This application claims priority based on Japanese Patent Application No. 2015-168456 filed in Japan on August 28, 2015 and Japanese Patent Application No. 2016-004004 filed in Japan on January 13, 2016, the contents of which are incorporated herein by reference.

Background Art

In the past, as a structure that can ensure the water-retaining (water-stopping) properties and/or rigidity and yield strength of the vertical connection part, and is cheap and easy to construct to reduce construction period and/or cost, a vertical connection structure of hat-shaped steel sheet piles, such as disclosed in Patent Document 1, has been proposed.

Patent Document 1 discloses a vertical connection structure in which hat-shaped steel sheet piles having at least one web and one or more flanges and having a curved cross section are connected vertically. The vertical connection structure includes a lower joint member, an upper joint member, and an attachment and fixing means.

The lower joint member protrudes from the surface of the web and flange at at least two different locations on the upper end of the lower hat-shaped steel sheet pile and is fixed thereto. The upper joint member protrudes from the surface of the web and flange at at least two different locations on the lower end of the upper hat-shaped steel sheet pile corresponding to the lower joint member and is fixed thereto. The attachment and fixing means attaches and fixes the lower joint member to the upper joint member while the upper end edge of the lower hat-shaped steel sheet pile abuts the lower end edge of the upper hat-shaped steel sheet pile.

Prior art literature

Patent Literature

Patent Document 1: Japanese Patent Application Publication No. 2011-38288

Summary of the Invention

Problems to be solved by the invention

However, in the vertical joint structure of hat-shaped steel sheet piles disclosed in Patent Document 1, the cross-sectional performance of the steel plates forming the lower and upper joint members is lower than the cross-sectional performance of the hat-shaped steel sheet piles connected vertically. Therefore, the bending stiffness of the vertical joint portion, which is only provided with the lower and upper joint members, is reduced. Therefore, there is a possibility that the vertical joint portion will become a structural weakness when a bending load greater than expected is applied.

Another method involves connecting multiple hat-shaped steel sheet piles by on-site welding. However, with the increasing cross-sections of hat-shaped steel sheet piles in recent years, the average cross-sectional area of each hat-shaped steel sheet pile is large, and the amount of welding required increases. Consequently, the average welding time per vertical joint is long, and the construction period is particularly long when there are many vertical joints.

Furthermore, even when multiple hat-shaped steel sheet piles are connected by frictional fastening with high-strength bolts, the shear yield strength per high-strength bolt is not that high. Therefore, to ensure a connection strength comparable to the cross-sectional performance of the hat-shaped steel sheet piles, a large number of high-strength bolts are required. Consequently, the splice plates become larger, increasing processing costs, and the need to tighten numerous high-strength bolts increases construction time and the duration of the project.

These problems are particularly prominent in hat-shaped steel sheet piles, which have a larger dimension in the wall width direction than steel members such as H-shaped steel and steel pipes.

The present invention is made in view of the above-mentioned problems, and its purpose is to provide a vertical connection structure of hat-shaped steel sheet piles, a vertical hat-shaped steel sheet pile unit, and a steel wall that can ensure sufficient bending rigidity at the location where multiple hat-shaped steel sheet piles are connected in the axial direction of the material and can suppress the connection cost.

Technical solutions to solve problems

The summary of the present invention is as follows.

(1) The first embodiment of the present invention is a vertical connection structure of a hat-shaped steel sheet pile, characterized in that it is a vertical connection structure of a hat-shaped steel sheet pile in which a first hat-shaped steel sheet pile and a second hat-shaped steel sheet pile are butted against and connected to each other at their end faces in the axial direction of the material, and comprises: a first engaged stop portion protruding outward from the side surface of the first hat-shaped steel sheet pile; and a mounting portion arranged on the side surface of the second hat-shaped steel sheet pile and engaged and stopped in the axial direction of the material relative to the first engaged stop portion of the first hat-shaped steel sheet pile.

According to the above-described structure for vertically connecting hat-shaped steel sheet piles, the mounting portion provided on the side of the second hat-shaped steel sheet pile is engaged and stopped by the first engaged and stopped portion protruding outward from the side of the first hat-shaped steel sheet pile. Therefore, the mounting portion can resist the bending stress acting on the vertically connected portion of the hat-shaped steel sheet pile, thereby improving the bending rigidity. Furthermore, during vertical connection construction, the mounting portion provided on the second hat-shaped steel sheet pile is engaged and stopped by the first engaged and stopped portion of the first hat-shaped steel sheet pile, thereby easily and reliably connecting the first and second hat-shaped steel sheet piles. This allows for vertical connection construction without the need for time-consuming and costly welding work.

(2) In the vertical connection structure of the hat-shaped steel sheet pile described in (1) above, the following structure may also be adopted: it is also provided with a second engaged stop portion protruding outward from the side surface of the second hat-shaped steel sheet pile, and the erection portion is engaged and stopped at the second engaged stop portion in addition to being engaged and stopped at the first engaged stop portion.

According to the vertical connection structure of the hat-shaped steel sheet pile of the above-mentioned scheme, during the vertical connection construction, the erection part is also engaged and stopped at the second engaged stop part of the second hat-shaped steel sheet pile, so that the first hat-shaped steel sheet pile and the second hat-shaped steel sheet pile can be connected more easily and effectively, thereby allowing the vertical connection construction to be carried out without the need for welding work that consumes time and cost.

(3) In the vertical connection structure of the hat-shaped steel sheet piles described in (2) above, the following structure may also be adopted: the end face of the first hat-shaped steel sheet pile is coplanar with the end face of the first engaged stop portion, and the end face of the second hat-shaped steel sheet pile is coplanar with the end face of the second engaged stop portion.

According to the above-described vertical connection structure of the hat-shaped steel sheet pile, not only the end faces of the first and second hat-shaped steel sheet piles are butted against each other, but also both end faces of the first and second engaged stoppers are butted against each other. Therefore, the compressive force acting in the direction of axially approaching the first and second hat-shaped steel sheet piles is borne not only by the end faces of the steel sheets but also by the side faces of the engaged stoppers, thereby resisting a greater bending load.

(4) In the vertical connection structure of the hat-shaped steel sheet pile described in any one of (1) to (3) above, the following structure can be adopted: the first engaged stop portion has an extended protrusion extending in the axial direction of the material on its front end side, and the erection portion has a recess extending in the wall width direction perpendicular to the axial direction of the material and the sheet thickness direction of the first hat-shaped steel sheet pile and engaged and stopped at the extended protrusion.

According to the above-described vertical connection structure for hat-shaped steel sheet piles, the extended projection of the first engaged stop portion slides relative to the recess of the mounting portion in the wall width direction, thereby engaging and locking the first engaged stop portion and the mounting portion. This facilitates the connection operation. Furthermore, the mounting portion is prevented from falling off the first engaged stop portion, thereby enabling a more reliable connection between the first hat-shaped steel sheet pile and the second hat-shaped steel sheet pile.

(5) In the vertical connection structure of the hat-shaped steel sheet pile described in (4) above, the following structure may be adopted: it is also provided with a sliding prevention portion that restricts the relative movement between the mounting portion and the first engaged stop portion in the wall width direction.

According to the vertical connection structure of the hat-shaped steel sheet pile of the above-mentioned aspect, the sliding prevention portion prevents the installation portion and the first engaged stop portion from moving relative to each other and releasing the engaged stop state therebetween.

(6) In the vertical connection structure of the hat-shaped steel sheet pile described in any one of (1) to (5) above, a configuration may be adopted in which a plurality of the first engaged stopper portions are provided spaced apart from each other along the axial direction of the material.

According to the vertical connection structure of the hat-shaped steel sheet pile of the above-mentioned aspect, the bending stress borne by each first engaged stopper portion can be reduced, and thus the breakage of the first engaged stopper portion can be prevented.

(7) In the vertical connection structure of the hat-shaped steel sheet pile described in (6) above, the following configuration may be adopted: the plurality of first engaged stoppers are integrally provided with respect to a common base material.

The vertical connection structure of the hat-shaped steel sheet pile according to the above embodiment can maintain a constant separation distance between the plurality of first engaging stoppers that are separated from each other in the axial direction of the material. Therefore, when the plurality of first engaging stoppers are attached to the first hat-shaped steel sheet pile, all the first engaging stoppers can be accurately attached in a single step of fixing the base material to the first hat-shaped steel sheet pile.

(8) In the vertical connection structure of the hat-shaped steel sheet pile described in any one of (1) to (7) above, the following structure may be adopted: when observing the portion of the erection portion other than the engaging and stopping portion engaged and stopped with the first engaged stop portion on a cross section perpendicular to the axial direction of the material, the cross-sectional area is the largest at the docking position between the first hat-shaped steel sheet pile and the second hat-shaped steel sheet pile.

According to the vertical connection structure of the hat-shaped steel sheet pile of the above aspect, the cross-sectional area of the portion of the installation portion that most requires bending rigidity is increased, thereby achieving both lightweighting of the installation portion and ensuring bending rigidity.

(9) A second aspect of the present invention is a vertically connected hat-shaped steel sheet pile unit having a vertically connected structure of the hat-shaped steel sheet piles according to any one of (1) to (8) above.

According to the hat-shaped steel sheet pile of the above-mentioned aspect, vertical connection construction can be performed without performing welding work that consumes time and cost.

(10) The third scheme of the present invention is a steel wall, characterized in that the steel wall is obtained by continuously arranging a plurality of vertical hat-shaped steel sheet pile units described in (9) above in a wall width direction perpendicular to the axial direction of the material and the sheet thickness direction of the first hat-shaped steel sheet pile, and the respective installation parts of the vertical hat-shaped steel sheet pile units adjacent to each other in the wall width direction are arranged in a manner so that their positions in the axial direction of the material are different from each other.

According to the vertical connection structure of the hat-shaped steel sheet piles of the above aspect, it is possible to avoid the connection portion which would become a structural weakness from being continuous in the wall width direction, and thus it is possible to ensure high bending rigidity in the entire wall body.

Effects of the Invention

According to the vertical connection structure of the hat-shaped steel sheet piles according to the solution described in (1), the bending rigidity of the installation portion can be ensured, and reliable vertical connection construction can be performed without welding work as in the conventional structure. Therefore, it is possible to reduce the construction cost when vertically connecting a plurality of hat-shaped steel sheet piles in the axial direction of the material of the plurality of hat-shaped steel sheet piles while ensuring sufficient bending rigidity.

According to the vertical connection structure of the hat-shaped steel sheet piles involved in the solution described in (2), the construction cost when vertically connecting a plurality of hat-shaped steel sheet piles in the axial direction of the materials of the plurality of hat-shaped steel sheet piles can be further suppressed.

According to the vertical connection structure of the hat-shaped steel sheet piles according to the solution described in (3) above, more sufficient bending rigidity can be ensured.

According to the vertical connection structure of the hat-shaped steel sheet piles according to the solution described in (4), the construction cost of the vertical connection construction can be further suppressed.

According to the vertical connection structure of the hat-shaped steel sheet pile involved in the solution described in (5) above, the engaged and stopped state between the installation portion and the first engaged and stopped portion is prevented from being released, so the connection state between the two can be made reliable and firm.

The vertical connection structure of the hat-shaped steel sheet pile according to the solution described in (6) above can prevent the first joined stop portion from being damaged, thereby further improving the bending rigidity of the vertical connection portion between the first hat-shaped steel sheet pile and the second hat-shaped steel sheet pile.

According to the vertical connection structure of the hat-shaped steel sheet pile involved in the solution described in (7) above, all the first engaged stoppers can be accurately installed in one process, so the construction cost can be further suppressed.

According to the vertical connection structure of the hat-shaped steel sheet piles involved in the solution described in (8) above, a lightweight installation portion with high bending rigidity can be used, so vertical connection construction can be carried out more easily.

According to the vertical connection structure of the hat-shaped steel sheet piles according to the solution described in (9), reliable vertical connection construction can be carried out even without welding work as in the conventional structure. Therefore, it is possible to reduce the construction cost when vertically connecting a plurality of hat-shaped steel sheet piles in the axial direction of the material of the plurality of hat-shaped steel sheet piles while ensuring sufficient bending rigidity.

According to the vertical connection structure of the hat-shaped steel sheet piles involved in the solution described in (10), high bending rigidity can be ensured in the entire wall body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a steel wall of a vertical connection structure to which hat-type steel sheet piles are applied.

FIG2 is a front view of the vertical connection structure of the hat-shaped steel sheet pile.

FIG3 is a top view of the vertical connection structure shown in FIG2 .

FIG4 is a plan view of a vertical connection structure in which a bridge portion is also provided on the web portion of the hat-shaped steel sheet pile.

FIG5 is a plan view of a vertical connection structure in which bridge portions are provided on both surfaces of a hat-shaped steel sheet pile.

FIG6A is a rear view of the installation portion.

FIG6B is a side view of the installation portion.

FIG7A is a front view of the vertical connection structure, a portion of which is a cross-sectional view.

FIG7B is a longitudinal cross-sectional view of the vertical connection structure.

FIG8A is a longitudinal sectional view of a vertical connection structure in which engaged stoppers are provided at both ends of a first hat-shaped steel sheet pile and a second hat-shaped steel sheet pile. FIG8A is a longitudinal sectional view of a vertical connection structure in which engaged stoppers are provided at both ends of the first hat-shaped steel sheet pile and the second hat-shaped steel sheet pile.

FIG8B is a longitudinal sectional view of a vertical connection structure in which engaged stoppers are provided only at the ends of the first hat-shaped steel sheet pile.

FIG8C is a longitudinal sectional view of a vertical connection structure in which engaged stoppers are provided on both surfaces of a hat-shaped steel sheet pile.

FIG. 9A is a longitudinal cross-sectional view of a vertical connection structure in which a bolt is threadedly engaged with a weld nut.

9B is a longitudinal sectional view of a vertical connection structure in which a bolt is threadedly engaged with an internal thread portion formed on a side surface of a hat-shaped steel sheet pile.

FIG. 10 is a side view of a vertical connection structure in which the erection portion-side protrusion and the engaged stopper portion are formed into a substantially rectangular cross-section.

FIG. 11 is a side view of a vertical connection structure in which the erection portion-side protrusion and the engaged stopper portion are formed into a substantially trapezoidal cross-section.

FIG. 12 is a side view of a vertical connection structure in which the erection portion-side protrusion and the engaged stopper portion are formed into a substantially T-shaped cross section.

FIG. 13 is a side view of a vertical connection structure in which a mounting portion side protrusion and a stopper portion to be engaged are formed by welding flat steel.

14A is a longitudinal sectional view of a vertical connection structure in which a mounting portion-side protrusion and an engaged stopper portion are formed substantially parallel to each other.

FIG14B is a partial enlarged view of the vertical connection structure shown in FIG14A .

FIG. 14C is a modified example of the vertical connection structure shown in FIG. 14A .

FIG. 14D is another variation of the vertical connection structure shown in FIG. 14A .

15A is a longitudinal sectional view of a vertical connection structure in which the distance between the distal end side of the bridging portion-side protrusion and the engaged stopper portion is smaller than the distance between the proximal end side.

FIG15B is a partial enlarged view of the vertical connection structure shown in FIG15A .

16A is a longitudinal sectional view of a vertical connection structure in which a single end surface of a mounting portion-side protrusion and an engaged stopper portion, on the side opposite to the abutment surface, is formed at a substantially right angle.

FIG. 16B is a partial enlarged view of the vertical connection structure shown in FIG. 16B .

FIG17A is a longitudinal sectional view for explaining the compressive force acting on the hat-shaped steel sheet pile.

FIG17B is a longitudinal sectional view for explaining the tensile force acting on the hat-shaped steel sheet pile.

FIG17C is a longitudinal sectional view for explaining the warping deformation occurring in the installation portion.

18A is a longitudinal sectional view of a vertical connection structure in which a protrusion on the erection portion side is sandwiched between an engaged stopper portion.

18B is a longitudinal sectional view showing a state in which eccentric bending acts on the erection portion in the vertical connection structure shown in FIG. 18A .

18C is a longitudinal sectional view of a vertical connection structure in which the side protrusion of the erection portion and the engaged stop portion are formed into a tapered shape at the position farthest from the mating surface of the first hat-shaped steel sheet pile and the second hat-shaped steel sheet pile, illustrating a situation in which eccentric bending acts on the erection portion.

19A is a longitudinal sectional view of a vertical connection structure in which the plate thickness of the flat plate portion on the center side is formed to be larger than the plate thickness of the flat plate portion on the end side in the bridge portion.

19B is a longitudinal sectional view of a vertical connection structure in which the plate thickness of the flat plate portion on the center side is formed to be larger than the plate thickness of the flat plate portion on the end side in the bridge portion.

19C is a longitudinal sectional view of a vertical connection structure in which the plate thickness of the flat plate portion on the center side is formed to be larger than the plate thickness of the flat plate portion on the end side in the bridge portion.

FIG. 20 is a perspective view showing a state in which the bridge portion of the vertical connection structure according to the embodiment is moved in the plate thickness direction X. FIG.

21 is a perspective view showing a state in which the bridging portion having the bridging portion-side protrusion having a substantially trapezoidal or T-shaped cross section is moved in the wall width direction Z. FIG.

22 is a perspective view showing a state in which the bridging portion, in which the bridging portion-side protrusions and the engaged stopper portions are formed into a wedge shape, is moved in the wall width direction Z. FIG.

FIG23A is a front view showing the plate member after the cutting process.

FIG23B is a front view showing the bridge portion after the cutting process.

FIG. 23C is a front view showing the bridging portion-side protrusion and the engaged stopper portion inclined in the wall width direction Z. FIG.

FIG24A is a front view showing a state in which a plate member having a protrusion formed thereon and a plate member having a recessed portion formed thereon are aligned with each other.

FIG. 24B is a front view showing a state in which the protrusion is fitted into the recess. FIG.

FIG25A is a perspective view showing the installation portion performing a sliding movement.

FIG25B is a perspective view showing the frame member attached to the installation portion.

FIG25C is a perspective view showing a state where the frame is sandwiched between both side portions.

FIG. 26A is a front view showing a mounting portion provided with bolts and the like penetrating in the axial direction Y of the material.

FIG26B is a longitudinal sectional view of the installation portion shown in FIG26A .

FIG27A is a perspective view showing the installation portion performing a sliding movement.

FIG27B is a perspective view showing a latch member attached to the installation portion.

FIG. 27C is a perspective view showing a latch member fitted into a notch groove.

FIG28 is a plan view showing a bending load acting on a hat-shaped steel sheet pile.

DETAILED DESCRIPTION

Hereinafter, a vertical connection structure 1 of hat-shaped steel sheet piles (hereinafter simply referred to as a vertical connection structure 1 ) according to an embodiment of the present invention will be described in detail with reference to the drawings.

The vertical connection structure 1 is used for: as shown in Figure 1, for example, in a narrow plot where long hat-shaped steel sheet piles cannot be constructed, multiple hat-shaped steel sheet piles 2 (first hat-shaped steel sheet pile 2A and second hat-shaped steel sheet pile 2B) to be buried below and above the foundation 8 are connected to each other in the material axial direction Y.

A plurality of hat-shaped steel sheet piles 2 are connected in the material axial direction Y to form an elongated vertical hat-shaped steel sheet pile unit 70. Furthermore, by continuously arranging a plurality of these vertical hat-shaped steel sheet pile units 70 in the wall width direction Z, a steel wall 7 is constructed in the foundation 8 or the like.

As shown in FIG. 2 , the hat-shaped steel sheet piles 2 connected in the material axial direction Y are connected by the bridge portion 5 in a state where the end surfaces 3 a of the end portions 3 in the material axial direction Y are butted against each other.

The bridge portion 5 is made of steel, for example, and is bridged across the side surfaces 3 b and 3 b of the end portions 3 in the material axial direction Y of each hat-shaped steel sheet pile 2 facing each other in the material axial direction Y.

As shown in Figure 3, the hat-shaped steel sheet pile 2 has a flange portion 2a, a pair of web portions 2b, a pair of arm portions 2c, and a butt joint portion 2d. By fitting the joint portions 2d of adjacent hat-shaped steel sheet piles 2 in the wall width direction Z, a plurality of hat-shaped steel sheet piles 2 can be continuously arranged in the wall width direction Z.

The hat-shaped steel sheet pile 2 has a flange portion 2a extending in the wall width direction Z and web portions 2b formed obliquely from both ends of the flange portion 2a in the wall width direction Z, thereby forming a groove portion S. The hat-shaped steel sheet pile 2 has arm portions 2c formed from one end of each web portion 2b, and joint portions 2d formed at the front end of each arm portion 2c.

The hat-shaped steel sheet pile 2 has a flat surface 20 formed in a substantially flat shape at the flange portion 2a, the web portion 2b, and the arm portion 2c.

The mounting portion 5 may be mounted only on the flat surface 20 of the flange portion 2a as shown in FIG3 , may be mounted on the flat surface 20 of the flange portion 2a and the flat surfaces 20 of the pair of web portions 2b as shown in FIG4 , or may be mounted on the flat surface 20 of the flange portion 2a and the flat surfaces 20 of the pair of arm portions 2c as shown in FIG5 . In particular, as shown in FIG5 , the mounting portion 5 may be mounted not only on one surface of the flat surface 20 but also on both surfaces of the flat surface 20.

In the example shown in FIG. 4 , the three installation portions 5 are installed on the flat surface 20 of the flange portion 2a and the flat surface 20 of the pair of web portions 2b, respectively. However, a plurality of installation portions 5 may be installed integrally on the hat-shaped steel sheet pile.

As shown in FIG. 6A and FIG. 6B , the bridge portion 5 includes a flat plate portion 51 made of a steel plate or the like, and a bridge portion-side protrusion 50 protruding in the plate thickness direction X from the flat plate portion 51 .

The bridging portion-side protrusion 50 extends continuously and linearly in the wall width direction Z and is formed integrally with the flat plate portion 51 by hot rolling or cold rolling.

The mounting portion side protrusions 50 may be formed integrally with the flat plate portion 51 by cutting a steel plate, etc. Alternatively, the mounting portion 5 may be obtained by using a steel plate as the flat plate portion 51 and welding the mounting portion side protrusions 50 to the side surface of the steel plate.

The mounting portion 5 has a plate thickness t of the flat plate portion 51 of, for example, 9 mm to 25 mm, a width B of 50 mm to 125 mm or 200 mm to 400 mm, and a height H of 200 mm to 400 mm. Furthermore, the mounting portion 5 has a length L of 10 mm to 38 mm in the material axial direction Y, a height h of 4.5 mm to 25 mm in the plate thickness direction X, and a distance D between the mounting portion-side protrusions 50 of 60 mm to 100 mm.

As shown in Figures 7A and 7B, the mounting portion 5 is provided so that the flat plate portion 51 is continuous with the side surfaces 3b of the upper and lower hat-shaped steel sheet piles 2 in the material axial direction Y, and the mounting portion-side protrusions 50 protrude from the flat plate portion 51 toward the side surfaces 3b. The mounting portion 5 is provided along the flat surface 20 formed at each end portion 3 of the hat-shaped steel sheet pile 2.

The flat plate portion 51 is formed, for example, in a generally rectangular shape as shown in FIG7A . As shown in FIG7B , bolt insertion holes 40 are formed on the upper and lower sides of the flat plate portion 51 in the material axial direction Y, extending through the sheet thickness direction X. The flat plate portion 51 has a plurality of mounting portion-side protrusions 50 spaced apart from one another along the material axial direction on the side facing the flat surface 20 of the end portion 3 of the hat-shaped steel sheet pile 2. This reduces the average bending stress borne by each mounting portion-side protrusion 50, thereby preventing damage to the mounting portion-side protrusion 50. However, multiple mounting portion-side protrusions 50 are not required; a single mounting portion-side protrusion 50 may be provided.

As shown in FIG7A and FIG7B , the mounting portion-side protrusion 50 is engaged and stopped in the material axial direction Y by an engaged stopper 60 (first engaged stopper) protruding outward from the side surface 3b of the end portion 3 of the first hat-shaped steel sheet pile 2A and an engaged stopper 60 (second engaged stopper) protruding outward from the side surface 3b of the end portion 3 of the second hat-shaped steel sheet pile 2B. This restricts relative movement between the first hat-shaped steel sheet pile 2A and the second hat-shaped steel sheet pile 2B in the material axial direction Y.

Thus, the mounting portion-side protrusions 50 are formed on both the upper and lower sides of the flat plate portion 51 in the material axial direction Y, and are mutually engaged and stopped by the engaged stopper 60 provided on the side surface 3b of the end portion 3 of the first hat-shaped steel sheet pile 2A. Therefore, the mounting portion 5 can counteract the bending stress acting on the vertical connection portion of the hat-shaped steel sheet pile 2, thereby improving the bending rigidity. Furthermore, the mounting portion 5 can easily and reliably connect multiple hat-shaped steel sheet piles 2, thereby enabling vertical connection construction without the need for time-consuming and costly welding work.

In the vertical connection structure 1 shown in Figures 7A and 7B , the engaged stopper 60 extends continuously and linearly in the wall width direction Z, and a plurality of engaged stopper portions 60 are provided spaced apart from each other along the material axial direction Y. Furthermore, the engaged stopper portions 60 are integrally formed with the plate member 6 (base material), which is attached to the side surface 3b of the end portion 3 of the hat-shaped steel sheet pile 2. The engaged stopper portions 60 extending continuously and linearly in the wall width direction Z are integrally formed with the plate member 6 by, for example, hot or cold rolling.

In the vertical connection structure 1 shown in Figures 7A and 7B, the end face 3a of the first hat-shaped steel sheet pile 2A is coplanar with the end face of the material of the plate part 6 of the engaged stop part 60 on the axial direction Y, and the end face 3a of the second hat-shaped steel sheet pile 2B is coplanar with the end face of the material of the plate part 6 of the engaged stop part 60 on the axial direction Y.

According to this structure, not only the end faces 3a of the first hat-shaped steel sheet pile 2A and the second hat-shaped steel sheet pile 2B are butted against each other, but also the end faces of the engaged stopper 60 can be butted against each other. Therefore, the compressive force acting in the direction of approaching each other in the axial direction of the materials between the first hat-shaped steel sheet pile 2A and the second hat-shaped steel sheet pile 2B can be borne not only by the end faces of the steel sheets but also by the side faces of the engaged stopper, thereby resisting a larger bending load.

7A and 7B , the end faces of the plate member 6 are butted against each other. However, in the absence of the plate member 6 , the same effect can be achieved by butting the end faces of the material of the engaged stopper portion 60 in the axial direction Y.

The joined stopper portion 60 may be formed integrally with the plate member 6 by cutting a steel plate, etc. Alternatively, the joined stopper portion 60 may be obtained by using a steel plate as the plate member 6 and welding a flat steel bar to the side surface of the steel plate.

In the vertical connection structure 1 shown in Figures 7A and 7B , a plurality of engaged stoppers 60 are provided on the side surface of the plate member 6, spaced apart from each other along the material axial direction Y. This reduces the average bending stress borne by each engaged stopper 60, thereby preventing damage to the engaged stopper 60. However, only one engaged stopper 60 may be provided.

Furthermore, in the vertical connection structure 1 shown in Figures 7A and 7B , a plurality of engaged stoppers 60 are provided, spaced apart from one another along the material axial direction Y, and are integrally formed with a single plate member 6 serving as a common base material. Consequently, the separation distance between the plurality of engaged stoppers 60 spaced apart from one another in the material axial direction can be maintained constant. Consequently, when attaching the plurality of engaged stoppers 60 to the hat-shaped steel sheet pile 2, all engaged stoppers 60 can be accurately attached in a single step of securing the base material plate member 6 to the hat-shaped steel sheet pile 2.

However, as shown in FIG. 8A , the joined stopper portion 60 may be provided by attaching a flat steel bar or the like to the side surface 3 b of the end portion 3 of the hat-shaped steel sheet pile 2 by direct welding or the like.

Furthermore, in the vertical connection structure 1 shown in Figures 7A and 7B , the mounting portion 5 is engaged and stopped by the engaged stop portion 60 of the first hat-shaped steel sheet pile 2A and the engaged stop portion 60 of the second hat-shaped steel sheet pile 2B. However, as shown in Figure 8B , the mounting portion 5 may be engaged and stopped only by the engaged stop portion 60 of the first hat-shaped steel sheet pile 2A. In this case, the mounting portion-side protrusion 50 is not formed on the flat plate portion 51 of the mounting portion 5, and the side surface 3b of the end portion 3 of the second hat-shaped steel sheet pile 2B and the flat plate portion 51 are attached by direct welding or the like. Furthermore, as shown in Figure 8C , the mounting portion 5 may be attached to both surfaces of the hat-shaped steel sheet pile 2.

As shown in Figures 7A and 7B, the mounting portion 5 is bolted to the side surface 3b of the end portion 3 of the hat-shaped steel sheet pile 2 by a bolt 4 that penetrates from the flat plate portion 51 to the end portion 3 of the hat-shaped steel sheet pile 2 in the sheet thickness direction X. The mounting portion 5 is fixed to the end portion 3 of the hat-shaped steel sheet pile 2 by threading a fastening nut 41 into the bolt 4 on the inner surface (back surface) of the end portion 3 of the hat-shaped steel sheet pile 2.

The mounting portion 5 can be secured not only using a fastening nut 41 screwed in the sheet thickness direction X, but can also be secured using, for example, a weld nut 42 or an internal thread 43 provided on the flat surface 20 of the end portion 3 of the hat-shaped steel sheet pile 2, as shown in Figures 9A and 9B. In this case, the mounting portion 5 is secured by threading the bolt 4 into the weld nut 42 or internal thread 43. Furthermore, even in this case, the mounting portion 5 can be attached to both surfaces of the hat-shaped steel sheet pile 2.

The bolt 4 is inserted through the bolt insertion hole 40 formed in the flat plate portion 51 of the installation portion 5, the plate member 6, and the end portion 3 of the hat-shaped steel sheet pile 2. The bolt 4 is threadedly engaged with a weld nut 42 attached to the end portion 3 of the hat-shaped steel sheet pile 2 by welding as shown in FIG9A, or is threadedly engaged with an internal thread portion 43 formed on the end portion 3 of the hat-shaped steel sheet pile 2 by internal thread processing as shown in FIG9B.

The mounting portion-side protrusion 50 and the engaged stopper 60 are formed to have a generally rectangular cross-section as shown in FIG10 . The mounting portion-side protrusion 50 and the engaged stopper 60, particularly when formed by hot rolling or cold rolling, may also have a generally trapezoidal cross-section as shown in FIG11 , or a generally T-shaped cross-section as shown in FIG12 .

As shown in Figures 10 to 12, the side protrusion 50 of the erection portion and the engaged stop portion 60 are subjected to tensile force T along the direction in which the multiple hat-shaped steel sheet piles 2 are separated from each other in the axial direction Y of the material, so that the single end face of the side protrusion 50 of the erection portion on the axial direction Y of the material and the single end face of the engaged stop portion 60 on the axial direction Y of the material abut against each other.

The mounting portion-side protrusion 50 and the engaged stopper 60 form an abutment surface 30 by abutting against each other at their respective end surfaces facing each other in the material axial direction Y. The mounting portion-side protrusion 50 and the engaged stopper 60 resist the tensile force T by engaging and stopping each other at the abutment surface 30 in the material axial direction Y, thereby restraining the plurality of hat-shaped steel sheet piles 2 from separating from each other in the material axial direction Y.

As shown in Figure 10, the side protrusion 50 of the erection part and the engaged stop part 60 are formed to have a roughly rectangular cross-section, so that the abutment surface 30 of the erection part side protrusion 50 is formed to be roughly perpendicular to the side surface of the flat plate part 51 of the erection part 5 and the abutment surface 30 of the engaged stop part 60 is formed to be roughly perpendicular to the flat surface 20 of the end part 3 of the hat-shaped steel sheet pile 2 or the side surface of the plate part 6.

As shown in Figure 11, the mounting portion side protrusion 50 and the engaged stop portion 60 are formed to have a roughly trapezoidal cross-section, so that the mounting portion side protrusion 50 is formed to be tapered and inclined in the plate thickness direction X toward the end 3 of the hat-shaped steel sheet pile 2, and the engaged stop portion 60 is formed to be tapered and inclined in the plate thickness direction X toward the flat plate portion 51 of the mounting portion 5.

As shown in FIG11 , the mounting portion-side protrusion 50 is tapered so that the front end 50a protruding toward the side surface 3b of the end portion 3 of the hat-shaped steel sheet pile 2 is wider in the material axial direction Y than the base end 50b of the flat plate portion 51 connected to the mounting portion 5. Furthermore, the engaged stopper 60 is tapered so that the front end 60a protruding toward the flat plate portion 51 of the mounting portion 5 is wider in the material axial direction Y than the flat surface 20 connected to the end portion 3 of the hat-shaped steel sheet pile 2 or the base end 60b connected to the plate member 6.

As shown in FIG11 , the end surfaces of the bridging portion-side protrusion 50 and the engaged stopper 60 are formed to be substantially parallel to each other, so that the abutment surfaces 30, which are tapered and inclined in the plate thickness direction X, abut against each other. The bridging portion-side protrusion 50 and the engaged stopper 60 are tapered and inclined so that the front end 50 a of the bridging portion-side protrusion 50 widens, and the front end 60 a of the engaged stopper 60 widens, so that they engage and stop at the abutment surface 30 so as not to separate from each other in the plate thickness direction X.

As shown in Figure 12, the mounting portion side protrusion 50 and the engaged stop portion 60 are formed to have a roughly T-shaped cross-section, so that a mounting portion side extension portion 52 extending in the material axial direction Y is formed on the front end side 50a of the mounting portion side protrusion 50, and an engaged stop portion side extension portion 62 extending in the material axial direction Y is formed on the front end side 60a of the engaged stop portion 60.

The base end side 50b of the mounting portion-side protrusion 50 and the engaged stopper-side extension portion 62 of the engaged stopper 60 are formed to be substantially parallel to each other, so that the mounting portion-side protrusion 50 and the engaged stopper 60 abut on the abutting surface 30. The mounting portion-side extension portion 52 of the mounting portion-side protrusion 50 and the base end side 60b of the engaged stopper 60 are formed to be substantially parallel to each other, so that the mounting portion-side protrusion 50 and the engaged stopper 60 abut on the abutting surface 30.

The setting portion side extension portion 52 of the front end side 50a of the setting portion side protrusion 50 and the engaged stop portion side extension portion 62 of the front end side 60a of the engaged stop portion 60 are formed to extend in the material axial direction Y, so that the setting portion side protrusion 50 and the engaged stop portion 60 are engaged and stopped so that the two parties are not separated from each other in the plate thickness direction X.

In addition, regarding the mounting portion side protrusion 50 and the engaged stop portion 60, it is also possible to form a mounting portion side protrusion 50 that is inclined in a conical shape and a engaged stop portion 60 that is inclined in a conical shape, and to form a mounting portion side extension portion 52 on the front end side 50a of the mounting portion side protrusion 50 and an engaged stop portion side extension portion 62 on the front end side 60a of the engaged stop portion 60.

Regarding the mounting portion side protrusion 50 and the engaged stop portion 60, it is also possible, as shown in Figure 13, that when the respective separation distances D are larger than the respective lengths L in the axial direction Y of the material, the mounting portion side protrusion 50 is welded to the side surface of the flat plate portion 51 of the mounting portion 5 and the engaged stop portion 60 is welded to the flat surface 20 of the end portion 3 of the hat-shaped steel sheet pile 2 or the side surface of the plate member 6 at a single end surface arranged on the side opposite to the abutment surface 30.

The vertical connection structure 1 is formed with a plurality of mounting portion-side protrusions 50 that engage and engage with a plurality of engaged stop portions 60. As shown in Figures 14A, 14B, 14C, 14D, 15A, 15B, 16A, and 16B, the mounting portion-side protrusions 50 and the engaged stop portions 60 are preferably formed to be tapered and inclined. The vertical connection structure 1 has a rounded portion 30a formed on a single end surface 53 of the mounting portion-side protrusion 50 in the material axial direction Y, at both the leading end 50a and base end 50b of the mounting portion-side protrusion 50. Furthermore, a single end surface 63 of the engaged stop portion 60 in the material axial direction Y has a rounded portion 30a formed on both the leading end 60a and base end 60b of the engaged stop portion 60, thereby improving workability through easy extrusion.

In the vertical joint structure 1, in portions other than the rounded portion 30a, particularly as shown in Figures 14A and 14B , the individual end faces 53 of the respective mounting portion-side protrusions 50 that face each other in the material axial direction Y are preferably tapered to be substantially parallel to each other, and the individual end faces 63 of the respective engaged stop portions 60 that face each other in the material axial direction Y are preferably tapered to be substantially parallel to each other. In this case, when the mounting portion-side protrusions 50 are engaged and stopped by the engaged stop portions 60, the individual end faces 53 of the mounting portion-side protrusions 50 and the individual end faces 63 of the engaged stop portions 60 that face each other in the material axial direction Y are substantially parallel to each other, which can further improve workability.

At this time, in the vertical connection structure 1, the interval W1 of the front end sides 50a of the multiple mounting portion side protrusions 50 separated from each other in the material axial direction Y becomes approximately the same size as the interval W2 of the base end sides 50b of the multiple mounting portion side protrusions 50 separated from each other in the material axial direction Y, and the inclination angle θ1 of the abutment surface 30 of the mounting portion side protrusion 50 that resists the tensile force T (the inclination angle of the side surface far from the end 3) and the inclination angle θ2 of the single end surface 53 on the side opposite to the abutment surface 30 (the inclination angle of the side surface close to the end 3) become approximately the same size at their respective positions.

In addition, in the vertical connection structure 1, the interval W1 between the front end sides 60a of the multiple engaged stop parts 60 separated from each other in the material axial direction Y becomes approximately the same as the interval W2 between the base end sides 60b of the multiple engaged stop parts 60 separated from each other in the material axial direction Y, and the inclination angle θ1 of the abutment surface 30 of the engaged stop part 60 resisting the tensile force T and the inclination angle θ2 of the single end surface 63 on the side opposite to the abutment surface 30 become approximately the same at their respective positions.

Furthermore, in the vertical connection structure 1, for example, the radius of curvature of the R-section 30a can be set to approximately 5 mm, and the inclination angle θ1 can be set to approximately 45°. In the vertical connection structure 1, for example, the interval W1 can be set to approximately 30 mm. The smaller the difference between the intervals W1 and W2, the more advantageous it is for improving processability through extrusion.

In the example shown in FIG. 14B , the inclination angle θ1 is less than 90° and the inclination angle θ2 exceeds 90°. However, as in a modified example shown in FIG. 14C , the inclination angle θ1 may exceed 90° and the inclination angle θ2 may be less than 90°.

In the example shown in FIG. 14B , both side surfaces of the protrusion 50 are parallel. However, as in another modified example shown in FIG. 14D , the protrusion 50 may be tapered toward the distal end.

Furthermore, as shown in Figures 15A and 15B , in the vertical connection structure 1, when the mounting portion-side protrusions 50 and the engaged stopper 60 are formed to have a substantially trapezoidal cross-section, the spacing W1 between the leading ends 50a of the mounting portion-side protrusions 50 is smaller than the spacing W2 between the base ends 50b of the mounting portion-side protrusions 50, and the spacing W1 between the leading ends 60a of the engaged stopper 60 is smaller than the spacing W2 between the base ends 60b of the engaged stopper 60. In this case, as shown in Figures 16A and 16B , the vertical connection structure 1 may also be configured such that the inclination angle of the single end surface 53 of the mounting portion-side protrusion 50 on the side opposite the abutment surface 30 and the inclination angle (inclination angle θ2) of the single end surface 63 of the engaged stopper 60 are substantially perpendicular, as desired.

Here, the vertical connection structure 1 generates a compressive force P acting on the plurality of hat-shaped steel sheet piles 2 in a direction that brings them closer together in the material axial direction Y, as shown in FIG17A , or generates a tensile force T acting on the plurality of hat-shaped steel sheet piles 2 in a direction that separates them in the material axial direction Y, as shown in FIG17B . When the tensile force T acts on the plurality of hat-shaped steel sheet piles 2 in the vertical connection structure 1, there is a distance in the sheet thickness direction X between the contact surface 30 of the mounting portion-side protrusion 50 and the center of gravity of the flat plate portion 51. This may cause eccentric bending to act on the mounting portion 5, potentially causing warping deformation in the mounting portion 5 as shown in FIG17C , causing the mounting portion-side protrusion 50 to detach.

Therefore, in the vertical connection structure 1, as shown in Figures 18A to 18C, the mounting portion-side protrusion 50 formed on the end side G closest to the material in the axial direction Y is preferably sandwiched between the two engaged stopper portions 60 in a state of being separated from or in contact with the two engaged stopper portions 60 from both sides in the axial direction Y. In this case, in the vertical connection structure 1, the engaged stopper portion 60 is provided at a position above the mounting portion-side protrusion 50 on the upper end side of the mounting portion 5 in the axial direction Y, and the engaged stopper portion 60 is provided at a position below the mounting portion-side protrusion 50 on the lower end side of the mounting portion 5 in the axial direction Y.

As a result, in the vertical connection structure 1, the mounting portion-side protrusion 50 closest to the end side G in the material axial direction Y is sandwiched by the multiple engaged stoppers 60 from both sides in the material axial direction Y. As a result, as shown in FIG18B , even when eccentric bending acts on the mounting portion 5, the mounting portion-side protrusion 50 is engaged and stopped by the engaged stoppers 60 above or below the mounting portion-side protrusion 50. Therefore, warping deformation of the mounting portion 5 can be suppressed, preventing the mounting portion-side protrusion 50 from detaching.

In addition to the single end face 53 of the erection portion side protrusion 50 and the single end face 63 of the engaged stop portion 60 on the side opposite to the abutment surface 30 being formed at a substantially right angle, the vertical connection structure 1 is preferably formed in a tapered manner and engaged and stopped with each other as shown in FIG. 18C , because this more reliably prevents the erection portion side protrusion 50 from detaching.

19A to 19C , the plate thickness dimension t1 of the flat plate portion 51 on the central side F of the material in the axial direction Y is larger than the plate thickness dimension t2 of the flat plate portion 51 on the end side G of the mounting portion 5 in the axial direction Y of the material.

In this way, the cross-sectional area of the portion of the installation portion 5 excluding the engagement and stop portion with the engaged stop portion 60, as viewed in a cross section perpendicular to the material axial direction Y, is largest at the butt joint position of the hat-shaped steel sheet pile 2. Therefore, the cross-sectional area of the portion of the installation portion 5 that requires the most bending rigidity can be increased. Therefore, both lightweighting of the installation portion 5 and ensuring of bending rigidity can be achieved.

In the vertical connection structure 1 shown in FIG. 19A , the bridge portion 5 is formed into a tapered shape by making the outer surface 51 a of the flat plate portion 51 protrude more at the center side F than at the end sides G, so that the plate thickness t1 is larger than the plate thickness t2 .

In the vertical connection structure 1 shown in Figures 19B and 19C , the plate thickness dimension t1 is larger than the plate thickness dimension t2 by forming the inner surface 51b of the flat plate portion 51 to protrude more on the central side F than on the end side G. Specifically, the plate thickness dimension t1 may be larger than the plate thickness dimension t2 by continuously decreasing the thickness of the flat plate portion 51 as it moves away from the end 3 as shown in Figure 19B , or by decreasing the thickness of the flat plate portion 51 in a stepwise manner as it moves away from the end 3 as shown in Figure 19C .

Thus, the vertical connection structure 1 increases the rigidity of the mounting portion 5 at the center side F in the material axial direction Y by making the plate thickness dimension t1 of the flat plate portion 51 on the center side F greater than the plate thickness dimension t2 of the flat plate portion 51 on the end side G of the mounting portion 5. Therefore, even when eccentric bending acts on the mounting portion 5, warping deformation of the mounting portion 5 can be suppressed, thereby preventing the mounting portion-side protrusions 50 from falling off.

In addition, the vertical connection structure 1 can be such that the protrusion 50 of the erection portion closest to the end side G is sandwiched by multiple engaged stop portions 60 from both sides of the material axial direction Y as shown in Figures 18A to 18C, and the plate thickness dimension t1 of the flat plate portion 51 on the central side F is increased in the material axial direction Y as shown in Figures 19A to 19C.

As described above, in the vertical connection structure 1 shown in Figures 11, 12, 14A to 19C, etc., the engaged stopper portion 60 has an extended protrusion (a tapered portion of the engaged stopper portion 60 or an engaged stopper portion-side extension 62) at its front end that extends in the material axial direction Y. This extended protrusion engages with a recess formed in the bridging portion 5 extending in the wall width direction Z.

Thereby, the connection work can be easily performed and the detachment of the installation part 5 can be prevented reliably.

In the vertical connection structure 1, when the mounting portion-side protrusion 50 and the engaged stopper portion 60 are formed to have a generally rectangular cross-section, the mounting portion 5 is moved from the outside of the groove portion S of the hat-shaped steel sheet pile 2 in the sheet thickness direction X as shown in FIG20 . In this case, the mounting portion 5 is attached to the hat-shaped steel sheet pile 2 from the outside of the groove portion S and secured with bolts 4 or the like. Alternatively, the mounting portion 5 may be moved from the inside of the groove portion S of the hat-shaped steel sheet pile 2 and attached to the hat-shaped steel sheet pile 2 from the inside of the groove portion S.

In the vertical connection structure 1, when the mounting portion-side protrusions 50 and the engaged stoppers 60 are formed to have a substantially trapezoidal or T-shaped cross section, as shown in FIG21 , the mounting portion 5 is slidably moved in the wall width direction Z. At this time, the mounting portion-side protrusions 50 are slidably inserted between the plurality of engaged stoppers 60, and the engaged stoppers 60 are slidably inserted between the plurality of mounting portion-side protrusions 50, thereby securing the mounting portion 5 so as not to separate in the plate thickness direction X.

As shown in FIG22 , the vertical connection structure 1 may also have the engaged stopper 60 and the mounting portion-side protrusion 50 formed into a wedge shape. In this case, the workability of sliding the engaged stopper 60 between the multiple mounting portion-side protrusions 50 can be improved, and the friction between the mounting portion-side protrusions 50 and the engaged stopper 60 can prevent the mounting portion 5 from detaching. Furthermore, the play between the protrusions is reduced, which can also reduce slippage during deformation.

The vertical connection structure 1 can also be manufactured by cutting the mounting portion 5 and the plate member 6 having the engaged stopper 60 formed therein, as shown in Figures 23A and 23B, along a cutting line E inclined relative to the material axial direction Y. In this case, as shown in Figure 23C, the engaged stopper 60 and the mounting portion-side protrusions 50 are formed to be inclined relative to the wall width direction Z, and the mounting portion 5 is slidably moved in the wall width direction Z, so that the plurality of mounting portion-side protrusions 50 are slidably inserted between the plurality of engaged stopper portions 60.

In the vertical connection structure 1, when the stopper 33 is provided at one end in the wall width direction Z as needed and the mounting portion 5 is slidably moved in the wall width direction Z, the mounting portion 5 abuts against the stopper 33. At this time, the vertical connection structure 1 facilitates the sliding movement of the mounting portion 5 by tilting the engaged stopper 60 and the mounting portion-side protrusion 50. Furthermore, the abutment of the mounting portion 5 against the stopper 33 prevents the mounting portion 5 from sliding beyond necessity, thereby preventing the mounting portion 5 from falling off.

As needed, the vertical connection structure 1 may also include plate members 6 having engaged stoppers 60 attached to the side surfaces 3b of the ends 3 of both the first hat-shaped steel sheet pile 2A and the second hat-shaped steel sheet pile 2B, as shown in Figures 24A and 24B. In this case, the vertical connection structure 1 may also include, for example, a protrusion 65 formed on the plate member 6 on the first hat-shaped steel sheet pile 2A side, which protrudes in the material axial direction Y, and a depression 66 formed on the plate member 6 on the second hat-shaped steel sheet pile 2B side, which is sunken in the material axial direction Y.

In the vertical connection structure 1 shown in Figures 24A and 24B , when the first hat-shaped steel sheet pile 2A and the second hat-shaped steel sheet pile 2B are connected to each other in the material axial direction Y, the protrusion 65 formed on the plate member 6 on the first hat-shaped steel sheet pile 2A side is fitted into the recessed portion 66 formed on the plate member 6 on the second hat-shaped steel sheet pile 2B side. Thus, the vertical connection structure 1 is fitted into the recessed portion 66 by fitting the protrusion 65 into the recessed portion 66, making it easy to position the ends 3 of the multiple hat-shaped steel sheet piles 2 in the wall width direction Z. Furthermore, the vertical connection structure 1, in particular, has the protrusion 65 and the recessed portion 66 formed so as to be inclined relative to the wall width direction Z. The mutually inclined surfaces of the protrusion 65 and the recessed portion 66 serve as guides, facilitating the fitting of the protrusion 65 and the recessed portion 66.

As shown in Figures 25A to 25C , the vertical connection structure 1 may also include a frame member 55 provided on the mounting portion 5. This frame member 55 surrounds the mounting portion protrusions 50 and the engaged stoppers 60, which are mutually engaged and stopped in the material axis Y, when the plurality of mounting portion protrusions 50 are slidably inserted between the plurality of engaged stoppers 60. In this case, the vertical connection structure 1 can prevent the mounting portion 5 from sliding excessively by sandwiching the mounting portion protrusions 50 and the engaged stoppers 60 with the side portions 55a of the frame member 55. Furthermore, the vertical connection structure 1 may, if desired, include a groove 54 formed in the upper end surface 5b of the mounting portion 5, and the upper end portion 55b of the frame member 55 inserted into the groove 54. This restricts movement of the frame member 55 in the plate thickness direction X and prevents it from falling off.

As shown in FIG26A and FIG26B , the lower end surface 5a of the mounting portion 5 of the vertical connection structure 1 may be formed to be inclined downward from the upper side in the material axial direction Y toward the end 3 of the hat-shaped steel sheet pile 2. By inclining the lower end surface 5a of the mounting portion 5 toward the end 3 of the hat-shaped steel sheet pile 2, the vertical connection structure 1 can reduce the casting (driving) resistance applied to the lower end surface 5a of the mounting portion 5 when burying the hat-shaped steel sheet piles 2 (vertical hat-shaped steel sheet pile units 70) connected by the mounting portion 5.

Here, the vertical connection structure 1 may be provided with an axial member 56 such as a bolt 4 or a screw, which is continuous from the connection portion 5 and penetrates the engaged stop portion 60 or the plate member 6, on the upper end surface 5b of the connection portion 5 or the outer surface 51a of the flat plate portion 51. Alternatively, the vertical connection structure 1 may be provided with a plate 44 such as a flat steel bar, which is continuous from the connection portion 5 to the engaged stop portion 60 or the plate member 6, and the plate 44 may be fixed by a screw stopper or the like.

Furthermore, as shown in FIG27A to FIG27C , the vertical connection structure 1 may also be configured such that the mounting portion-side protrusion 50 and the engaged stopper 60 are partially removed in the wall width direction Z, thereby forming a notched groove 57a in the mounting portion-side protrusion 50 and the engaged stopper 60. In this case, in the vertical connection structure 1, a latch member 57 having a substantially square shape or the like and extending continuously in the material axial direction Y is fitted into the notched groove 57a formed by the partial removal of the mounting portion-side protrusion 50 and the engaged stopper 60.

Furthermore, from the viewpoint of ease of construction, it is preferable that the notch groove 57 a and the latch member 57 have a triangular shape with a width dimension gradually decreasing toward the front end side, rather than a substantially square shape.

In this manner, the vertical connection structure 1 includes only one of the frame member 55 shown in Figures 25A to 25C , the shaft member 56 shown in Figures 26A and 26B , the plate 44, and the latch member 57 shown in Figures 27A to 27C as the anti-slip portion. However, any combination of these components may be provided as needed. Thus, the vertical connection structure 1 can prevent the mounting portion 5 from falling off by restricting movement of the mounting portion 5 in the wall width direction Z using the anti-slip portion.

In the vertical connection structure 1, when the mounting portion-side protrusions 50 and the engaged stopper 60 are formed to have a generally trapezoidal or T-shaped cross-section, for example, the mounting portion 5 is fixed so as not to separate in the plate thickness direction X. Movement of the mounting portion 5 in the wall width direction Z is restrained by the frame member 55 or the like, and the mounting portion-side protrusions 50 and the engaged stopper 60 are engaged and stopped in the material axial direction Y. In this case, the vertical connection structure 1 prevents the mounting portion 5 from falling out without using bolts 4 that penetrate the end 3 of the hat-shaped steel sheet pile 2 in the plate thickness direction X, thereby eliminating the need for openings in the end 3 of the hat-shaped steel sheet pile 2. This improves the water-retaining performance of the hat-shaped steel sheet pile 2.

In the vertical structure 1, as shown in Figure 28, in particular, when multiple hat-shaped steel sheet piles 2 connected by the erection part 5 are buried in the foundation 8 or when multiple hat-shaped steel sheet piles 2 are buried in the foundation 8, a bending load M acts on the part where the multiple hat-shaped steel sheet piles 2 are connected.

In order to ensure that the vertical connection structure 1 can adequately resist the bending load M at the location where the multiple hat-shaped steel sheet piles 2 are connected, it is preferable that the bending rigidity and bending yield strength of the installation portion 5 be approximately the same as those of the hat-shaped steel sheet pile 2 alone. In this case, the vertical connection structure 1 is installed, for example, on the flange portion 2a and arm portion 2c via the installation portion 5 so that the distances e1 and e2 from the neutral axis C of the bending load M to the center of gravity of the installation portion 5 are approximately the same as the separation distances from the neutral axis C to the flange portion 2a and arm portion 2c of the hat-shaped steel sheet pile 2.

In the vertical connection structure 1, the dimension of the mounting portion 5 in the plate thickness direction X is preferably smaller than the dimension of the mounting portion 5 in the wall width direction Z. In this case, the distances e1 and e2 from the neutral axis C of the bending load M to the center of gravity of the mounting portion 5 are substantially the same as the flange portion 2a and arm portion 2c of the hat-shaped steel sheet pile 2. Therefore, by providing a mounting portion 5 having a cross-sectional area approximately equal to that of the hat-shaped steel sheet pile 2, the bending rigidity and bending yield strength of the mounting portion 5 can be made comparable to those of a single hat-shaped steel sheet pile 2. The vertical connection structure 1, with a mounting portion 5 having a thickness approximately equal to that of the hat-shaped steel sheet pile 2, can adequately resist the bending load M at the location where multiple hat-shaped steel sheet piles 2 are connected, thereby making the mounting portion 5 lightweight and compact.

In particular, the vertical connection structure 1 has the installation portion 5 installed at a position separated from the neutral axis C of the bending load M, and the section moment of inertia of the installation portion 5 is increased. Therefore, even if the thickness of the installation portion 5 is reduced, the portion where the multiple hat-shaped steel sheet piles 2 are connected can still sufficiently resist the bending load M. Thus, the vertical connection structure 1 can ensure sufficient bending rigidity at the portion where the multiple hat-shaped steel sheet piles 2 are connected, while also reducing the cost of connecting the multiple hat-shaped steel sheet piles by making the installation portion 5 lightweight and compact.

The vertical structure 1 can ensure sufficient bending rigidity at the location where multiple hat-shaped steel sheet piles 2 are connected, so the location where multiple hat-shaped steel sheet piles 2 are connected will not become a structural weakness, and can avoid the decline in the overall bending performance of the vertical hat-shaped steel sheet piles obtained by connecting multiple hat-shaped steel sheet piles in the axial direction Y of the material.

Furthermore, when the direction of action of the bending load M is determined, the vertical connection structure 1 can reduce the amount of steel used as the bridge portion 5 by bridge portion 5 only on the flat surface 20 of the flange portion 2a on the tension side as shown in FIG. 3 .

As shown in Figures 10 to 12 , the vertical connection structure 1 resists tensile force T by engaging and stopping a plurality of hat-shaped steel sheet piles 2 connected in the material axial direction Y at the abutment surface 30. The compressive strength of the mounting portion-side protrusions 50 and the engaged stopper 60 required to resist tensile force T is higher than the tensile strength, typically about 1.5 times. Therefore, the height h of the mounting portion-side protrusions 50 and the engaged stopper 60 in the plate thickness direction X is reduced to about 70% of the plate thickness dimension t' of the hat-shaped steel sheet piles 2 (h = 1/1.5 × t'), thereby making the mounting portion 5 lighter and more compact.

The steel wall 7 is constructed as shown in Figure 1, and comprises: a mounting portion 5, which is mounted on the side 3b of the end portion 3 of a plurality of hat-shaped steel sheet piles 2 connected to each other in the axial direction Y of the material; and a plurality of vertical hat-shaped steel sheet pile units 70 obtained by connecting the plurality of hat-shaped steel sheet piles in the axial direction Y of the material through the mounting portion 5, so that the plurality of vertical hat-shaped steel sheet pile units 70 are continuously arranged in the wall width direction Z, thereby extending in the wall width direction Z inside the foundation 8, etc.

In particular, the steel wall 7 comprises a plurality of vertically connected hat-shaped steel sheet pile units 70 arranged adjacent to each other and continuously in the wall width direction Z. The mounting portions 5 of each vertically connected hat-shaped steel sheet pile unit 70 are arranged so as to differ from each other in the material axial direction Y. In this case, the steel wall 7 arranges the connected portions of the plurality of hat-shaped steel sheet piles 2 in a generally staggered pattern in the wall width direction Z. This prevents the connected portions of the vertically connected hat-shaped steel sheet pile units 70 from being arranged at approximately the same position in the material axial direction Y and continuing in the wall width direction Z, which would otherwise constitute a structural weakness.

While the embodiments of the present invention have been described in detail above, the embodiments described above are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be construed as being limited by these examples.

Industrial applicability

According to the present invention, a vertical connection structure of hat-shaped steel sheet piles, a vertical connection hat-shaped steel sheet pile unit, and a steel wall can be provided, which can ensure sufficient bending rigidity at the location where multiple hat-shaped steel sheet piles are connected in the material axial direction Y and can suppress the connection cost.

Label Description

1: Vertical connection structure of hat-shaped steel sheet piles

2: Hat-shaped steel sheet pile

2A: First hat type steel sheet pile

2B: Second hat type steel sheet pile

2a: Flange

2b: belly

2c: Arm

2d: Joint

20: Flat surface

3: End

3a: End face

3b: Side

30: contact surface

30a: R section

31: The end of one side

32: The other end

33: Stopper

4: Bolts

40: Bolt insertion hole

41: Tighten the connecting nut

42: Welding nut

43: Internal thread

44: Board

5: Erection Department

5a: Lower end surface

5b: Upper end surface

50: Side protrusion of the installation part

50a: Front end side of the protrusion on the bridging portion side

50b: Base end side of the protrusion on the bridging portion side

51: Flat panel

51a: Outer surface

51b: Inner surface

52: Erection side extension

53: Single end surface of the extension part of the mounting part

54: Slot

55: Frame components

55a: Both sides of the frame member

55b: Upper end of the frame member

56: Shaft components

57: Latch component

57a: Notched groove

6: Board components

60: Engaged stopper

60a: Front end side of the engaged stopper portion

60b: Base end side of the engaged stopper portion

62: Engaged stopper side extension

63: Single end face of the engaged stopper

65: Protrusion

66: Depression

7: Steel Wall

70: Vertical cap steel sheet pile unit

8: Inside the foundation

X: Plate thickness direction

Y: Material axis

Z: wall width direction

Claims (11)

1. A vertical connection structure for cap-shaped sheet piles, characterized in that it is a vertical connection structure for cap-shaped sheet piles obtained by butt-joining and connecting the end faces of a first cap-shaped sheet pile and a second cap-shaped sheet pile at their material axial direction, comprising: The first engaged stop portion protrudes outward from the side of the first cap-shaped sheet pile; and The erection part is disposed on the side of the second cap-shaped sheet pile and engages and stops the first engaged stop part of the first cap-shaped sheet pile in the material axial direction. When observing the cross-sectional area of the erection part excluding the engagement stop portion that engages with the first engagement stop portion on a section perpendicular to the axial direction of the material, the cross-sectional area is largest at the joint position between the first cap-shaped sheet pile and the second cap-shaped sheet pile. 2. The vertical connection structure of the cap-shaped steel sheet pile according to claim 1, characterized in that, It also includes a second engaged stop portion protruding outward from the side of the second cap-shaped sheet pile. In addition to being engaged and stopped at the first engaged stop, the mounting part is also engaged and stopped at the second engaged stop. 3. The vertical connection structure of the cap-shaped steel sheet pile according to claim 2, characterized in that, The end face of the first cap-shaped sheet pile is coplanar with the end face of the first engaged stop portion. The end face of the second cap-shaped sheet pile is coplanar with the end face of the second joined stop. 4. The vertical connection structure of the cap-shaped steel sheet pile according to any one of claims 1 to 3, characterized in that, The first engaged stop has an extended protrusion on its front end side that extends axially in the material. The mounting portion has a recess that extends in the wall width direction perpendicular to the axial direction of the material and the thickness direction of the first cap-shaped sheet pile, and engages with and stops the extended protrusion. 5. The vertical connection structure of the cap-shaped steel sheet pile according to claim 4, characterized in that, It also includes a sliding prevention part that restricts the relative movement between the mounting part and the first engaged stop part in the direction of the wall width. 6. The vertical connection structure of the cap-shaped steel sheet pile according to any one of claims 1 to 3, characterized in that, The first engaged stop portion has multiple portions that are separated from each other along the axial direction of the material. 7. The vertical connection structure of the cap-shaped steel sheet pile according to claim 6, characterized in that, The plurality of first engaged stop portions are integrally disposed relative to a common substrate. 8. The vertical connection structure of the cap-shaped steel sheet pile according to any one of claims 1 to 3, characterized in that, The erection section is fixed to the cap-shaped sheet pile by bolts. 9. The vertical connection structure of the cap-shaped steel sheet pile according to any one of claims 1 to 3, characterized in that, The mounting section has a mounting section side protrusion that protrudes in the plate thickness direction. The first engaged stop and the mounting part protrude side, and abut against each other at the abutting surface, which is inclined in the plate thickness direction. 10. A vertically connected cap-shaped steel sheet pile unit, characterized in that, The vertical connection structure of the cap-shaped steel sheet pile as described in any one of claims 1 to 9. 11. A steel wall, characterized in that the steel wall is obtained by continuously arranging a plurality of vertically connected cap-shaped steel sheet pile units as described in claim 10 in a wall width direction perpendicular to the axial direction of the material and the thickness direction of the first cap-shaped steel sheet pile. The erection portions of the vertical cap-shaped sheet pile units that are adjacent to each other in the wall width direction are arranged in a manner that differs from each other in the axial direction of the material.