JP2021156130A - Steel sheet pile wall and construction method thereof - Google Patents

Abstract

To make it easy to fit a horizontal member to a steel sheet pile wall that is built using stainless steel sheet piles and prevent corrosion due to contact of a dissimilar metal.SOLUTION: A steel sheet pile wall is formed by connecting stainless steel sheet piles installed underground with each other and has an engaging member that is engaged to an upper end of the stainless steel sheet pile at a plurality of positions in extension direction of the steel sheet pile wall, a horizontal member that is connected to each engaging member and extends in extension direction of the steel sheet pile wall, and a concrete structure in which the upper end of the stainless steel sheet pile and the engaging member are embedded.SELECTED DRAWING: Figure 1

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 a steel sheet pile wall constructed by using a steel sheet pile made of ordinary steel, it is common to attach a horizontal member extending in the extension direction of the wall, specifically, H-shaped steel or the like, to the upper end portion. Such a horizontal member is also referred to as a support work or an upset, and examples thereof are described in Patent Document 1 and Patent Document 2, for example. In the conventional technique as described in these documents, in order to attach the horizontal member in response to the height error that occurs when the steel sheet pile is placed, the upper end of each steel sheet pile is attached after the construction of the steel sheet pile wall. It was common to bolt the horizontal members after drilling holes.

Japanese Unexamined Patent Publication No. 6-116941 Japanese Unexamined Patent Publication No. 2009-150061

As described above, the present inventors have developed a technique for changing a steel sheet pile, which was conventionally made of ordinary steel, to stainless steel. By making the steel sheet pile made of stainless steel, it is possible to prevent corrosion and surface rust of the steel sheet pile, and it is possible to construct a steel sheet pile wall having excellent durability and appearance.

However, since the stainless steel sheet pile is harder than the steel sheet pile made of ordinary steel, it is not easy to perform processing such as drilling. Specifically, a plasma cutting machine is used for cutting and drilling stainless steel sheet piles, but it is not realistic to use it in on-site construction. In addition, if the horizontal member and its mounting members are made of non-rust-preventive metal such as ordinary steel, corrosion may occur due to contact of dissimilar metals at the mounting part on the stainless steel sheet pile. There is.

Therefore, according to the present invention, when attaching a horizontal member to a steel sheet pile wall constructed by using a stainless steel sheet pile, the steel sheet pile wall and the steel sheet pile can be easily constructed and corrosion due to contact with dissimilar metals can be prevented. The purpose is to provide a method of wall construction.

[1] A steel sheet pile wall in which stainless steel sheet piles cast in the ground are connected to each other, and a locking member that is locked to the upper end of the stainless steel sheet pile at a plurality of positions in the extension direction of the steel sheet pile wall. A steel sheet pile wall including a horizontal member joined to each of the locking members and extending in the extension direction of the steel sheet pile wall, and a concrete structure in which the upper end portion of the stainless steel sheet pile and the locking member are embedded.
[2] The locking member includes a U-shaped cross section that sandwiches the upper end of the stainless steel sheet pile and a part of the horizontal member, and further includes an insulating member interposed between the stainless steel sheet pile and the horizontal member. The steel sheet pile wall according to [1].
[3] The horizontal member is an H-shaped steel having a pair of flanges and a web, and the locking member sandwiches the upper end of the stainless steel sheet pile and one of the H-shaped steel flanges with a U-shaped cross section. The steel sheet pile wall according to [2], wherein the concrete structure is constructed in contact with the inner side surface of the flange opposite to the locking member of the H-section steel and one side surface of the web.
[4] Any of [1] to [3], further comprising a connecting member joined to the horizontal member and extending toward the bottom surface of the concrete structure located in the gap between the horizontal member and the stainless steel sheet pile. The steel sheet pile wall according to item 1.
[5] The steel sheet pile wall according to [4], further comprising a formwork member that covers the bottom surface of the concrete structure, and the formwork member is fixed to the end of the connecting member on the opposite side of the horizontal member.
[6] A step of driving the stainless steel sheet piles into the ground while connecting them to each other, a step of locking the locking member to the upper end of the stainless steel sheet piles at a plurality of positions in the extension direction of the steel sheet pile wall, and locking. A process of arranging a horizontal member that is joined to each member and extends in the extension direction of the steel sheet pile wall, and a concrete structure in which the upper end of the stainless steel sheet pile and the locking member are embedded by filling concrete on the horizontal member. Construction method of steel sheet pile wall including the process of constructing the body.
[7] A formwork member that is joined to the horizontal member and extends toward the gap between the horizontal member and the stainless steel sheet pile is fixed to the end of the connecting member opposite to the horizontal member. The method for constructing a steel sheet pile wall according to [6], further comprising a step, in which concrete is filled onto the formwork member.
[8] The method for constructing a steel sheet pile wall according to [7], further comprising a step of removing the formwork member after the concrete is hardened.

According to the above configuration, when the horizontal member is attached to the steel sheet pile wall constructed by using the stainless steel sheet pile, it is possible to facilitate the construction and prevent corrosion due to the contact of dissimilar metals.

It is a top view of the steel sheet pile wall which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line II-II of the steel sheet pile wall shown in FIG.

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

FIG. 1 is a plan view of a steel sheet pile wall according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of the steel sheet pile wall shown in FIG. In the illustrated example, the steel sheet pile wall in which the stainless steel sheet piles 1 cast in the ground are connected to each other is formed by the stainless steel sheet pile 1 at a plurality of positions in the extension direction (x direction in the drawing) of the steel sheet pile wall. The locking member 2 that is locked to the upper end, the H-shaped steel 3 that is a horizontal member that extends in the extension direction of the steel sheet pile wall and is joined to each of the locking members 2, and the H-shaped steel 3 are joined to each other. , The connecting member 4 extending toward the gap between the H-shaped steel 3 and the stainless steel sheet pile 1, the form member 5 fixed to the end of the connecting member 4 opposite to the H-shaped steel 3, and H. It includes a shaped steel 3, a form member 5, and a concrete structure 7 constructed on a horizontal excavation surface 6A on the ground side of a steel sheet pile wall and in which an upper end portion of a stainless steel sheet pile 1 and a locking member 2 are embedded. The concrete structure 7 functions as a cap concrete for the steel sheet pile wall. The stainless steel sheet pile 1 is schematically shown, and the joint for connecting the individual stainless steel sheet piles 1 to each other is not shown. Further, in the plan view of FIG. 1, the illustration of concrete is omitted.

The locking member 2 is formed of a member having a U-shaped cross section, such as channel steel. The inner width of the U-shaped portion of the locking member 2 corresponds to the total of the thickness of the stainless steel sheet pile 1, the thickness of the flange 31 of the H-shaped steel 3, and the thickness of the insulating member 33 described later. The H-shaped steel 3 is welded or bolted to the locking member 2 so that the flange 31 is inside the U-shape of the locking member 2, and the cross section U of the locking member 2 is aligned with the flange 31 along the stainless steel sheet pile 1. By covering the stainless steel sheet pile 1 with the shaped portion, the upper end portion of the stainless steel sheet pile 1 and the flange 31 of the H-shaped steel 3 are sandwiched between the U-shaped portions of the locking member 2, and the H-shaped steel 3 is made of stainless steel. It can be fixed to the sheet pile 1. Welding and bolting for attaching the H-shaped steel 3 to the locking member 2 may be performed on-site or in advance at the factory. When welding or drilling is performed on-site, the locking member 2 and the H-shaped steel 3 are arranged according to the difference in the height position of the locking member 2 caused by the height error generated when the stainless steel sheet pile 1 is placed. After adjusting the relative position of, the H-shaped steel 3 can be joined to the locking member 2.

The H-section steel 3 has a pair of flanges 31 and a web 32. By attaching the H-shaped steel 3 to the stainless steel sheet pile 1 via the locking member 2 at a plurality of positions in the extension direction of the steel sheet pile wall, the upper ends of the stainless steel sheet pile 1 constituting the steel sheet pile wall are integrated. , For example, it can be joined to the girder 9 as shown in the illustrated example. The girder 9 is joined to the H-shaped steel 3 by, for example, welding or bolt joining. The H-section steel 3 also functions as a part of the formwork of the concrete structure 7. Specifically, in the present embodiment, the concrete structure 7 is constructed in contact with the inner side surface of the flange 31 and one side surface of the web 32 on the side opposite to the locking member 2 of the H-shaped steel 3. In another example, not limited to H-shaped steel, a horizontal member having an arbitrary shape that can be joined to a locking member, such as angle steel or channel steel, is used.

When fixing the H-shaped steel 3 by sandwiching the upper end of the stainless steel sheet pile 1 and the flange 31 of the H-shaped steel 3 at the U-shaped cross section of the locking member 2 as described above, the stainless steel sheet pile 1 and H An insulating member 33 is inserted between the shaped steel 3 and the flange 31. Of the flanges 31 arranged to face the stainless steel sheet pile 1, the portion sandwiched by the locking member 2 above the web 32 is embedded in the concrete structure 7 so that corrosion due to contact with dissimilar metals does not occur. On the other hand, since the portion below the web 32 is not embedded in the concrete structure 7, contact with the stainless steel sheet pile 1 may cause corrosion due to contact with dissimilar metals. Therefore, for example, an insulating member 33 made of wood or resin is inserted between the stainless steel sheet pile 1 and the flange 31 at least at a portion below the web 32. The insulating member 33 may be attached to the flange 31 in advance, for example, and when the locking member 2 is locked to the upper end portion of the stainless steel sheet pile 1, or after being locked, the stainless steel sheet pile 1 and the flange 31 It may be inserted or filled in the gap between them. In another example, for example, the H-shaped steel 3 and the stainless steel sheet pile 1 are joined to the outside of the locking member 2 having a U-shaped cross section, and the locking member 2 is locked to the stainless steel sheet pile 1. If there is an air gap between the and, the insulating member 33 may not be arranged.

The connecting member 4 is joined to the H-shaped steel 3 and extends toward the bottom surface of the concrete structure 7 located in the gap between the flange 31 of the H-shaped steel 3 and the stainless steel sheet pile 1. In the present embodiment, the connecting member 4 is welded to the flange 31 of the H-shaped steel 3. Welding may be performed on-site or in advance at the factory. Further, the connecting member 4 may be joined to the H-shaped steel 3 by a method other than welding, for example, by screwing the fastening metal fittings. The connecting member 4 may be, for example, a member called a separator or an anchor. In the illustrated example, the connecting member 4 extends from the flange 31 of the H-shaped steel 3 in the wall thickness direction (y direction in the drawing) of the steel sheet pile wall, and beyond that, in the height direction of the steel sheet pile wall (FIG. It is configured by combining with a portion extending in the z direction in the inside. The connecting member 4 fixes the formwork member 5 described below with a washer 41 attached to an end portion opposite to the attachment portion to the H-shaped steel 3.

The formwork member 5 is arranged substantially horizontally so as to close the gap between the flange 31 of the H-shaped steel 3 and the stainless steel sheet pile 1, and covers the bottom surface of the concrete structure 7. The formwork member 5 is stably supported by fixing the height position with the connecting member 4 and bringing the edge of the formwork member 5 into contact with the flange 31 of the stainless steel sheet pile 1 and the H-shaped steel 3. Since the height position is fixed by the connecting member 4, it is necessary to weld between the formwork member 5 and the stainless steel sheet pile 1 or to attach a bracket between the formwork member 5 and the stainless steel sheet pile 1. There is no. In another example, the connecting member 4 may not be provided, and the formwork member 5 may be welded to the H-shaped steel 3, or the formwork member 5 may be supported by a bracket attached to the H-shaped steel 3. ..

The formwork member 5 may be removed after the concrete constituting the concrete structure 7 is hardened. In that case, the formwork member 5 is not included in the completed steel sheet pile wall. The formwork member 5 may be formed of an insulating material such as wood or resin, or may be formed of a non-insulating material such as steel. When the formwork member 5 is made of a non-insulating material and the formwork member 5 is not removed after the concrete is hardened, an insulating member is inserted between the formwork member 5 and the stainless steel sheet pile 1.

The concrete structure 7 is constructed by filling concrete on the H-shaped steel 3, the formwork member 5, and the horizontal excavation surface 6A on the ground side of the steel sheet pile wall. Specifically, as shown in the cross-sectional view of FIG. 2, the space in which the concrete structure 7 is constructed is on the opposite side of the locking member 2 in the wall thickness direction (y direction in the drawing) of the steel sheet pile wall. From the inner surface of the flange 31 of the H-section steel 3 to the vertical excavation surface 6B of the ground, in the height direction of the steel sheet pile wall (z direction in the figure), above the web 32 of the H-section steel 3, the formwork member Above 5 and above the horizontal excavation surface 6A of the ground. The upper surface of the concrete structure 7 is higher than the upper end of the locking member 2. As a result, the upper end portion of the stainless steel sheet pile 1 and the locking member 2 are embedded in the concrete structure 7. Reinforcing bars 71 are arranged inside the concrete structure 7 so as not to interfere with the stainless steel sheet pile 1, the locking member 2, and the connecting member 4, and the reinforcing bars 71 are also embedded in the concrete structure 7.

In the steel sheet pile wall configured as described above, welding to the stainless steel sheet pile 1 is performed by joining the H-shaped steel 3 of the horizontal member to the locking member 2 locked to the upper end portion of the stainless steel sheet pile 1. It is possible to attach the horizontal member without any processing such as drilling or drilling. Since the attachment portion of the locking member 2 to the stainless steel sheet pile 1 is embedded in the concrete structure 7, corrosion does not occur even if dissimilar metals come into contact with each other. Therefore, for example, the locking member 2 and the H-shaped steel 3 can be formed of ordinary steel, and welding, bolt joining, or the like can be used for joining the H-shaped steel 3 to the locking member 2. By performing welding and drilling on-site, the horizontal member can be attached in response to the height error that occurs when the stainless steel sheet pile 1 is placed.

Next, an example of the construction method of the steel sheet pile wall according to the embodiment of the present invention will be described. First, the 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 at a plurality of positions in the extension direction of the steel sheet pile wall. Next, the H-shaped steel 3 is joined to the locking member 2 by on-site welding or bolt joining that has been drilled on-site. Next, the connecting member 4 is joined to the H-shaped steel 3, and the formwork member 5 is further fixed to the end of the connecting member 4 on the opposite side of the H-shaped steel 3. By this point, the formwork member 5 has been formed to match the shape of the gap between the flange 31 of the H-shaped steel 3 and the stainless steel sheet pile 1.

After fixing the H-shaped steel 3 and the formwork member 5 by the above process, concrete is filled on the H-shaped steel 3, the formwork member 5 and the horizontal excavation surface 6A on the ground side of the steel sheet pile wall to form concrete. Construct the structure 7. Although not shown, at this time, a formwork member arranged substantially vertically is also attached to the flange 31 on the side opposite to the locking member 2 of the H-shaped steel 3. As described above, the concrete is formed between the inner surface of the flange 31 of the H-shaped steel 3 on the opposite side of the locking member 2 to the vertical excavation surface 6B of the ground, and above the web 32 of the H-shaped steel 3, the formwork. It is filled above the member 5 and above the horizontal excavation surface 6A of the ground, whereby the upper end of the stainless steel sheet pile 1 and the locking member 2 are embedded in the concrete structure 7.

Further, a step of removing the formwork member 5 may be carried out after the concrete is hardened. At this time, the tip portion of the connecting member 4 may be left exposed from the concrete structure 7, or the tip portion may be cut off for reasons of appearance or the like. Therefore, in the completed steel sheet pile wall, the connecting member 4 may be partially embedded in the concrete structure 7 or may be entirely embedded in the concrete structure 7.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. It is naturally understood that these also belong to the technical scope of the present invention.

1 ... Stainless steel sheet pile, 2 ... Locking member, 3 ... H-shaped steel, 31 ... Flange, 32 ... Web, 33 ... Insulating member, 4 ... Connecting member, 41 ... Washer, 5 ... Formwork member, 6A ... Horizontal excavation Surface, 6B ... Vertical excavated surface, 7 ... Concrete structure, 71 ... Reinforcing bar, 9 ... Cutting beam.

Claims (8)

It is a steel sheet pile wall in which stainless steel sheet piles cast in the ground are connected to each other.
A locking member that is locked to the upper end of the stainless steel sheet pile at a plurality of positions in the extension direction of the steel sheet pile wall.
A horizontal member joined to each of the locking members and extending in the extension direction of the steel sheet pile wall,
A steel sheet pile wall including an upper end portion of the stainless steel sheet pile and a concrete structure in which the locking member is embedded. The locking member includes a portion having a U-shaped cross section that sandwiches the upper end portion of the stainless steel sheet pile and a part of the horizontal member.
The steel sheet pile wall according to claim 1, further comprising an insulating member inserted between the stainless steel sheet pile and the horizontal member. The cross member is an H-section steel with a pair of flanges and webs.
The locking member sandwiches the upper end of the stainless steel sheet pile and one flange of the H-shaped steel with the U-shaped cross section.
The steel sheet pile wall according to claim 2, wherein the concrete structure is constructed in contact with an inner side surface of a flange of the H-shaped steel opposite to the locking member and one side surface of the web. Any of claims 1 to 3, further comprising a connecting member joined to the horizontal member and extending toward the bottom surface of the concrete structure located in the gap between the horizontal member and the stainless steel sheet pile. Or the steel sheet pile wall according to item 1. Further provided with a formwork member covering the bottom surface of the concrete structure,
The steel sheet pile wall according to claim 4, wherein the formwork member is fixed to an end portion of the connecting member on the side opposite to the horizontal member. The process of placing stainless steel sheet piles in the ground while connecting them to each other,
A step of locking a locking member to the upper end of the stainless steel sheet pile at a plurality of positions in the extension direction of the steel sheet pile wall, and
A step of arranging a horizontal member that is joined to each of the locking members and extends in the extension direction of the steel sheet pile wall.
A method for constructing a steel sheet pile wall, which comprises a step of filling concrete on the horizontal member to construct a concrete structure in which an upper end portion of the stainless steel sheet pile and the locking member are embedded. A formwork member that closes the gap is attached to the end of the connecting member that is joined to the horizontal member and extends toward the gap between the horizontal member and the stainless steel sheet pile on the side opposite to the horizontal member. Including the step of fixing
The method for constructing a steel sheet pile wall according to claim 6, wherein the concrete is filled on the formwork member. The method for constructing a steel sheet pile wall according to claim 7, further comprising a step of removing the formwork member after the concrete is hardened.

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