JP7490414B2 - Steel sheet pile walls and construction methods for steel sheet pile walls - Google Patents

Description

The present invention relates to a steel sheet pile wall and a method for constructing a steel sheet pile wall.

Conventionally, steel sheet piles have been made of ordinary steel. In steel sheet pile walls constructed using ordinary steel sheet piles, it is common to pour cap concrete into the head of the steel sheet pile. Techniques for pouring such cap concrete are described, for example, in Patent Document 1 and Patent Document 2. In the conventional techniques described in these documents, it was common to fix the formwork for the cap concrete to the steel sheet pile by welding it.

Japanese Patent Application Laid-Open No. 2-91311 Japanese Patent Application Laid-Open No. 6-65917

As described above, the inventors have developed a technology to make steel sheet piles, which were previously made of ordinary steel, out of stainless steel. By making the steel sheet piles out of stainless steel, corrosion and surface rust of the steel sheet piles can be prevented, and a steel sheet pile wall with excellent durability and appearance can be constructed.

However, unlike ordinary steel sheet piles, it is difficult to weld other components such as formwork to the surface of stainless steel sheet piles. In addition, stainless steel sheet piles are harder than ordinary steel sheet piles, so processing such as drilling holes on-site is not easy. In addition, if components such as formwork are made of metals that do not have rust resistance, such as ordinary steel, corrosion may occur at the attachment points to the stainless steel sheet piles due to contact between dissimilar metals.

The present invention aims to provide a steel sheet pile wall and a construction method for the steel sheet pile wall that can facilitate construction and prevent corrosion caused by contact between dissimilar metals when pouring cap concrete into a steel sheet pile wall constructed using stainless steel sheet piles.

[1] A steel sheet pile wall in which stainless steel sheet piles are driven into the ground and connected to each other, comprising: a locking member that is locked to the upper end of the stainless steel sheet pile; a concrete structure in which the upper end of the stainless steel sheet pile and the locking member are embedded; and a connecting member that is joined to the locking member and extends toward at least one of the side or bottom surface of the concrete structure.
[2] The steel sheet pile wall described in [1], wherein the connecting members include a first connecting member extending toward a side surface of the concrete structure and a second connecting member extending toward a bottom surface of the concrete structure, and one locking member is arranged for each pair of the first connecting member and the second connecting member.
[3] A steel sheet pile wall as described in [1], in which the engaging member is placed on the upper end of the stainless steel sheet pile and includes a long member extending in the extension direction of the steel sheet pile wall, and multiple connecting members are joined to a common long member.
[4] A steel sheet pile wall as described in any one of [1] to [3], further comprising a formwork member covering at least one of the side or bottom surface of the concrete structure, the formwork member being fixed to the end of the connecting member on the side opposite the locking member.
[5] A method for constructing a steel sheet pile wall, comprising the steps of driving stainless steel sheet piles into the ground while connecting them to each other, engaging locking members to the upper ends of the stainless steel sheet piles, fixing formwork members to the locking members via connecting members, and filling the inside of the formwork members with concrete to embed the upper ends of the stainless steel sheet piles and the locking members in the concrete.
[6] The method for constructing a steel sheet pile wall according to [5], further comprising a step of removing the formwork members after the concrete has hardened.

According to the above configuration, the connecting members for fixing the formwork members can be attached via the locking members that are locked to the upper end of the stainless steel sheet pile, so there is no need to weld other members to the stainless steel sheet pile, making construction easy. In addition, because the locking members are embedded in the concrete structure together with the upper end of the stainless steel sheet pile, corrosion due to contact between dissimilar metals does not occur. Note that the formwork members can be removed after the concrete has hardened, so the completed steel sheet pile wall does not necessarily include the formwork members.

FIG. 2 is a plan view of the steel sheet pile wall according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the steel sheet pile wall shown in FIG. 1 along line II-II. FIG. 11 is a plan view of a steel sheet pile wall according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of the steel sheet pile wall shown in FIG. 3 along line IV-IV.

A preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. Note that in this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

(First embodiment)
FIG. 1 is a plan view of a steel sheet pile wall according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the steel sheet pile wall shown in FIG. 1 along line II-II. In the illustrated example, the steel sheet pile wall is formed by connecting stainless steel sheet piles 1 driven into the ground, and includes a locking member 2 locked to the upper end of the stainless steel sheet pile 1, a connecting member 3 joined to the locking member 2, a formwork member 4 fixed to the connecting member 3, and a concrete structure 5 constructed by concrete filled inside the formwork member 4, in which the upper end of the stainless steel sheet pile 1, the locking member 2, and a part of the connecting member 3 are embedded. The concrete structure 5 functions as a cap concrete for the steel sheet pile wall. Note that the stainless steel sheet pile 1 is illustrated in a schematic manner, and joints for connecting the individual stainless steel sheet piles 1 to each other are omitted. Also, the illustration of concrete is omitted in the plan view of FIG. 1.

The locking member 2 is, for example, a member in which a plate-shaped portion 2A is placed on the upper end of the stainless steel sheet pile 1 and a pair of plate-shaped portions 2B protruding downward from the plate-shaped portion 2A are combined into a U-shape as a whole. The locking member 2 is locked to the stainless steel sheet pile 1 by inserting the upper end of the stainless steel sheet pile 1 between the pair of plate-shaped portions 2B. This is not a limitation to the example, and the locking member 2 may be integrally formed into a U-shape, for example, like a channel steel.

The connecting member 3 includes a connecting member 3A extending toward the side of the concrete structure 5 and a connecting member 3B extending toward the bottom surface of the concrete structure 5. In the illustrated example, the connecting member 3A and the connecting member 3B are each welded to the locking member 2. The welding may be performed on-site or in advance at a factory. The connecting member 3 may also be joined to the locking member 2 by a method other than welding, for example, by screwing a fastening metal fitting. In this embodiment, one locking member 2 is arranged for one set of connecting members 3A and 3B. The connecting member 3 may be, for example, a member called a separator or an anchor.

More specifically, the connecting member 3A extends from the locking member 2 in the wall thickness direction of the steel sheet pile wall (y direction in the figure), and fixes the formwork member 4A with a washer 31A attached to the end opposite the locking member 2. On the other hand, the connecting member 3B includes a portion extending from the locking member 2 in the wall thickness direction of the steel sheet pile wall and a portion extending in the height direction of the steel sheet pile wall (z direction in the figure) beyond that, and fixes the formwork member 4B with a washer 31B attached to the end opposite the locking member 2. In another example, the connecting member 3B may include only a portion extending in the height direction of the steel sheet pile wall, and may be indirectly joined to the locking member 2 by being joined by welding or the like to the middle part of the connecting member 3A.

The formwork members 4 include formwork members 4A that cover the sides of the concrete structure 5, and formwork members 4B that cover the bottom of the concrete structure 5. One edge of the formwork member 4B, which is arranged approximately horizontally and contacts the stainless steel sheet pile 1, is cut to match the shape of the steel sheet pile wall. The formwork member 4B is fixed in height by connecting members 3B, and is stably supported by abutting one edge against the stainless steel sheet pile 1. Because the height is fixed by connecting members 3B, there is no need to weld between the formwork member 4B and the stainless steel sheet pile 1, or to attach a bracket between the formwork member 4B and the stainless steel sheet pile 1.

On the other hand, formwork member 4A, which is arranged approximately vertically, is arranged so that its lower end abuts against the upper surface of formwork member 4B. Formwork member 4A is fixed in a horizontal position by connecting member 3A, and is stably supported by abutting its lower end against the upper surface of formwork member 4B. Formwork member 4A and formwork member 4B may be directly joined to prevent misalignment or gaps, or may be indirectly joined using a bracket or the like.

The formwork members 4 may be removed after the concrete that constitutes the concrete structure 5 has hardened, in which case the completed steel sheet pile wall will not include the formwork members 4.

The concrete structure 5 is constructed by filling the inside of the formwork member 4 with concrete. Specifically, as shown in the cross-sectional view of FIG. 2, the space in which the concrete structure 5 is constructed is between the formwork member 4A and the vertical excavation surface 6A of the ground in the wall thickness direction of the steel sheet pile wall (y direction in the figure), above the formwork member 4B in the height direction of the steel sheet pile wall (z direction in the figure), and above the horizontal excavation surface 6B on the ground side of the steel sheet pile wall. The upper surface of the concrete structure 5 is higher than the upper ends of the locking member 2 and the connecting member 3. As a result, the upper end of the stainless steel sheet pile 1 and the locking member 2 are embedded in the concrete structure 5. Reinforcing bars 51 are arranged inside the concrete structure 5 so as not to interfere with the stainless steel sheet pile 1, the locking member 2, and the connecting member 3, and the reinforcing bars 51 are also embedded in the concrete structure 5.

In the steel sheet pile wall constructed as described above, by joining the connecting member 3 to the locking member 2 that is locked to the upper end of the stainless steel sheet pile 1, a member for fixing the formwork can be attached without welding to the stainless steel sheet pile 1. The part where the locking member 2 is attached to the stainless steel sheet pile 1 is embedded in the concrete structure 5, so even if dissimilar metals come into contact, corrosion does not occur. Therefore, for example, the locking member 2 and the connecting member 3 can be made of ordinary steel, and the connecting member 3 can be easily joined to the locking member 2 by on-site welding or the like. The part where the formwork member 4B abuts against the stainless steel sheet pile 1 is not embedded in the concrete structure 5, but if the formwork member 4B is made of an insulating material such as wood or resin, contact between dissimilar metals does not occur. The formwork member 4A may be made of an insulating material or a non-insulating material such as steel. The formwork member 4B may also be made of a non-insulating material, and an insulating member may be inserted between the formwork member 4B and the stainless steel sheet pile 1.

Next, a method for constructing a steel sheet pile wall according to the first embodiment of the present invention will be described. First, stainless steel sheet piles 1 are driven into the ground while being connected to each other to form the main body of the steel sheet pile wall. Next, the locking member 2 is locked to the upper end of the stainless steel sheet pile 1. If the connecting member 3 has not been previously joined to the locking member 2, the connecting member 3 is now joined to the locking member 2 by on-site welding or the like. Next, the formwork member 4 is fixed to the end of the connecting member 3 opposite the locking member 2. Specifically, first, the formwork member 4B, which is arranged approximately horizontally, is fixed to the end of the connecting member 3B and abutted against the stainless steel sheet pile 1, and then the formwork member 4A, which is arranged approximately vertically, is fixed to the end of the connecting member 3A and abutted against the upper surface of the formwork member 4B.

After the formwork member 4 is fixed by the above process, concrete is filled inside the formwork member 4 to construct the concrete structure 5. As described above, concrete is filled between the formwork member 4A and the vertical excavation surface 6A of the ground, above the formwork member 4B, and above the horizontal excavation surface 6B on the ground side, thereby embedding the upper end of the stainless steel sheet pile 1, the locking member 2, and part of the connecting member 3 into the concrete structure 5.

Furthermore, after the concrete has hardened, a process of removing the formwork members 4 may be carried out. At this time, the tip of the connecting member 3 may be left exposed from the concrete structure 5, or the tip may be cut off for reasons such as appearance. Therefore, in the completed steel sheet pile wall, the connecting member 3 may be partially embedded in the concrete structure 5, or may be entirely embedded in the concrete structure 5.

Second Embodiment
FIG. 3 is a plan view of a steel sheet pile wall according to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view of the steel sheet pile wall shown in FIG. 3 along line IV-IV. The difference from the first embodiment is that the locking member 12 includes a long member 12A placed on the upper end of the stainless steel sheet pile 1 and extending in the extension direction of the steel sheet pile wall (x direction in the figure), and at least one pair of protruding members 12B protruding downward from the long member 12A and sandwiching the upper end of the stainless steel sheet pile 1. The long member 12A is formed of a shaped steel material such as a through angle member. The protruding member 12B is a pin-shaped member welded in advance to the lower surface of the long member 12A. In the illustrated example, the long member 12A is arranged to intersect with the washer portion of the stainless steel sheet pile 1, and the protruding member 12B is arranged to match the pitch of the intersection between the long member 12A and the stainless steel sheet pile 1.

In this embodiment, the locking member 12 including the long member 12A and the protruding member 12B can be attached to the upper end of the stainless steel sheet pile 1 without welding. Furthermore, since the locking member 12 is embedded in the concrete structure 5, even if it is made of ordinary steel, corrosion due to contact between dissimilar metals does not occur. Therefore, the locking member 12 and the connecting member 3 can be made of ordinary steel and easily joined using on-site welding, etc. In addition, in this embodiment, the locking member 12 includes the long member 12A, and multiple connecting members 3 (multiple sets of connecting members 3A, 3B) are joined to a common long member 12A, thereby reducing the number of parts.

The steel sheet pile wall according to the second embodiment of the present invention as described above can be constructed by the same construction method as the steel sheet pile wall according to the first embodiment described above. The protruding member 12B may be joined to the long member 12A in advance, for example, or the long member 12A may be placed on the upper end of the stainless steel sheet pile 1 and then joined by on-site welding or the like to the intersection between the long member 12A and the stainless steel sheet pile 1.

The above describes in detail preferred embodiments of the present invention with reference to the attached drawings, but the present invention is not limited to such examples. It is clear that a person with ordinary knowledge in the technical field to which the present invention pertains can conceive of various modified or revised examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

1...stainless steel sheet pile, 2, 12...locking member, 2A, 2B...plate-shaped portion, 12A...long member, 12B...protruding member, 3, 3A, 3B...connecting member, 31A, 31B...washer, 4, 4A, 4B...formwork member, 5...concrete structure, 51...reinforcing bar, 6A...vertical excavation surface, 6B...horizontal excavation surface.

Claims (6)

A steel sheet pile wall in which stainless steel sheet piles are driven into the ground and connected to each other,
a locking member including a first portion placed on the upper end of the stainless steel sheet pile and a second portion protruding downward from the first portion, the locking member being locked to the upper end of the stainless steel sheet pile by positioning the upper end of the stainless steel sheet pile between the second portion;
a concrete structure in which the upper end portion of the stainless steel sheet pile and the locking member are embedded;
a connecting member joined to the engaging member and extending toward at least one of a side surface and a bottom surface of the concrete structure ;
The steel sheet pile wall , wherein the connecting member includes a first connecting member extending from the locking member toward a side surface of the concrete structure, and a second connecting member extending toward a bottom surface of the concrete structure. The steel sheet pile wall according to claim 1 , wherein the locking member is arranged one for each pair of the first connecting member and the second connecting member. The steel sheet pile wall has a planar shape in which concave and convex portions are repeated when viewed from one side,
a first portion of the locking member is placed on an upper end portion of the stainless steel sheet pile and includes a long member extending in an extension direction of the steel sheet pile wall across a plurality of the recesses ;
The steel sheet pile wall according to claim 1 , wherein the connecting members arranged in each of the plurality of recesses are joined to a common elongated member. The concrete structure further includes a first formwork member that covers a side surface of the concrete structure, and a second formwork member that covers a bottom surface of the concrete structure,
The first frame member is fixed to an end portion of the first connecting member opposite to the end portion joined to the locking member ,
The steel sheet pile wall according to claim 1 , wherein the second formwork member is fixed to an end portion of the second connecting member opposite to the end portion joined to the locking member . driving the stainless steel sheet piles into the ground while connecting them to each other;
a step of fastening a fastening member including a first portion placed on the upper end of the stainless steel sheet pile and a second portion protruding downward from the first portion to the upper end of the stainless steel sheet pile by positioning the upper end of the stainless steel sheet pile between the second portions;
a step of fixing a formwork member to the locking member via a connecting member;
and filling the inside of the formwork member with concrete and embedding the upper end of the stainless steel sheet pile and the locking member in the concrete to form a concrete structure .
The connecting member includes a first connecting member extending from the locking member toward a side surface of the concrete structure and a second connecting member extending toward a bottom surface of the concrete structure,
A method for constructing a steel sheet pile wall, wherein the formwork members include a first formwork member covering a side surface of the concrete structure and fixed to the engaging member via the first connecting member, and a second formwork member covering a bottom surface of the concrete structure and fixed to the engaging member via the second connecting member . The method for constructing a steel sheet pile wall according to claim 5, further comprising the step of removing the formwork members after the concrete has hardened.

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