JP2008248659A - Structure of double anticorrosive-coated steel sheet pile superior in joint part anti-corrosiveness and steel sheet pile used for its structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a hat-shaped steel sheet pile having an anticorrosive structure superior in workability when installing a cover member, by surely installing the cover member, even if a joint part is dislocated, when preventing corrosion of the joint part by the cover member, after constructing the hat-shaped steel sheet pile. <P>SOLUTION: Before being connected in advance, an L-shaped metal fitting is fixed along a claw part to the vicinity of the claw part of the hat-shaped steel sheet pile, and after connecting the steel sheet pile, an end part of the cover member covering the joint part formed of the mutually fitted claw parts of the adjacent steel sheet pile, is fitted to a groove part formed between an overhang part of the L-shaped metal fitting and the steel sheet pile, and is arranged in the joint part, and a filler is filled in a space formed between a cover and the claw part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hat-type steel sheet pile structure that is excellent in anticorrosion properties after placement in a severe corrosive environment such as the ocean, and a steel sheet pile used for the structure.

  Conventionally, steel sheet piles have been widely applied as wall structural members such as underground earth retainings, foundation structures and ports in rivers, riverbanks, riverwalls and underground water barriers. Conventionally, U-shaped steel sheet piles have been mainly used as this steel sheet pile, but in recent years it is wider than U-shaped steel sheet piles, and the man-hours required for placing steel sheet piles when forming sheet pile walls Moreover, since the time can be shortened, a hat-type steel sheet pile having a hat-shaped cross section as shown in FIG.

  As a countermeasure when using such a steel sheet pile in a corrosive environment such as a river or the ocean, an anticorrosion method for applying a heavy anticorrosion coating to a tidal zone or a splash zone in contact with the water surface has been adopted. Heavy-duty corrosion-proof steel sheet piles coated with thick films such as polyethylene and polyurethane can be expected to have durability for several decades. However, generally, heavy-duty corrosion-proof coatings are not applied to the joints of steel sheet piles. For this reason, in the conventional general U-shaped steel sheet pile, for example, as shown in Patent Documents 2 and 3, a steel sheet pile is placed, and then a highly corrosion-resistant cover member is attached to the joint portion by means such as bolts or welding. Anti-corrosion measures to be fixed have been proposed, and even for hat-type steel sheet piles, anti-corrosion measures for joints are desired.

  As shown in FIG. 2, the claw portion 2 for connecting the hat-type steel sheet pile is formed in a shape having a margin in consideration of workability at the time of fitting, and as shown in FIG. As shown in FIG. 2B, there are cases where the connection is shifted to the left or right during the fitting, or the connection is curved as shown in FIG. When using anti-corrosion measures for joints using a cover member, it is necessary to have a structure that can adapt to the deviation even if there is a deviation in the connection, and the cover member is attached in seawater. From the viewpoint of workability, it is necessary that the cover member mounting structure is also simple.

JP 2001-131957 A Japanese Patent Laid-Open No. 2000-212985 JP 2004-131957 A

  Therefore, in the present invention, after the hat-type steel sheet pile is constructed, when the joint portion is anticorrosive with the cover member, the cover member can be securely attached even when the joint portion is displaced, and when the cover member is attached. It is an object of the present invention to provide a hat-type steel sheet pile structure having an anticorrosive structure with good workability, and a steel sheet pile used for the structure.

In order to solve the above-mentioned problems, the present invention provides a heavy anticorrosion coating on one surface, and a plurality of steel sheet piles having a hat-shaped cross section, by fitting the claws formed at the ends to each other. About the steel sheet pile structure connected by the formed joint part,
(1) An L-shaped bracket is fixed in advance along the claw portion before connection in the vicinity of the claw portion of the surface of the steel sheet pile to be subjected to the heavy anticorrosion coating, and the end of the cover member covering the joint portion after connection. The portion is fitted into a groove formed between the overhanging portion of the L-shaped metal fitting and the steel sheet pile, and is disposed in the joint portion, and a filler is formed in an interval formed between the cover member and the claw portion. Make sure it is filled.
Further, in the above (1),
(2) The L-shaped bracket is fixed so that the overhanging portion is positioned on the claw portion side, and the end portion of the cover member is fitted in the groove portion facing the adjacent steel sheet pile, Be placed between the mold brackets.
(3) The L-shaped metal fitting is fixed so that the protruding portion is located on the side opposite to the claw portion, and bent portions directed inward are formed at both ends of the cover, respectively. The cover member is arranged so as to cover the L-shaped metal fitting by fitting in the groove portion.
(4) The cover member is made of reinforced fiber plastic, resin, or corrosion-resistant metal material.

Moreover, it is used for the steel sheet pile structure as described in (1) above, and the cross-section with the heavy anticorrosion coating on one surface is a hat-shaped steel sheet pile,
(5) An L-shaped bracket for attaching a cover member that covers the joint portion is fixed along the claw portion in the vicinity of the claw portion of the surface of the steel sheet pile to be subjected to the heavy anticorrosion coating.
Further, in the above (5),
(6) The L-shaped bracket is fixed so that the overhanging portion is positioned on the claw portion side.
(7) The L-shaped bracket is fixed so that the overhanging portion is located on the opposite side of the claw portion.

  According to the present invention, since a simple structure is employed in which the end of the cover covering the joint is fitted into a slit-shaped groove formed between the protruding portion of the L-shaped bracket and the steel sheet pile, the hat-shaped steel A hat-type steel sheet pile structure with good workability when attaching the cover member, even when the joint portion is corroded with the cover member after construction of the sheet pile, even if the joint portion is displaced. The steel sheet pile used for a body and its structure can be provided. Moreover, since the filler is filled in the gap formed between the cover and the claw portion, a hat-type steel sheet pile structure having a high anticorrosion effect on the joint portion can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
FIG. 1 shows a steel sheet pile with a hat-shaped cross section, that is, a hat-type steel sheet pile, and in FIGS. 3 and 4, the claws 2 formed at the ends of the hat-type steel sheet pile 1 are fitted to each other and connected. The example which applied this invention to the joint part 7 of a hat-type steel sheet pile structure is shown.

As shown in FIG. 1, a hat-type steel sheet pile 1 includes a central flange portion 3, a web portion 4 extending obliquely from both ends of the flange portion 3, and an arm portion extending laterally from the web portion 4 in parallel with the flange portion 3. 5 and a claw portion 2 formed at an end portion of the arm portion 5.
Each steel sheet pile 1 is provided with a heavy anticorrosion coating 6 on portions corresponding to a tidal zone in contact with the seawater surface or a splash zone where seawater scatters when it is actually placed on site. The heavy anticorrosion coating 6 is not applied to the claw portion 2 as described above, and the adjacent claw portions 2 of the hat-type steel sheet piles are fitted and connected to each other as shown in FIG. When such a structure is formed, it is necessary to protect the joint portion 7 of the adjacent steel sheet pile.

  Therefore, in the present invention, a steel sheet pile in which an L-shaped metal fitting is fixed in advance along the claw portion before connection is used in the vicinity of the claw portion of the surface on which the heavy anticorrosion coating is applied, and the steel sheet pile is connected to the adjacent steel sheet pile. The end of the cover member that covers the joint portion formed by the claw portions fitted to each other of the sheet piles is fitted into a groove formed between the protruding portion of the L-shaped bracket and the steel sheet pile, and the cover member is It arrange | positions at the said joint part and fills the space | interval formed between a cover member and a nail | claw part with resin or mortar.

  FIG. 3 shows an embodiment of the present invention. In this embodiment, an L-shaped metal fitting 8 is fixed in advance by welding so that the protruding portion 9 is positioned on the claw portion 2 side in the vicinity of the claw portion 2 of the arm portion 4 of the hat-shaped steel sheet pile, and the protruding portion A slit-shaped groove is formed between the arm 9 and the arm 4. At that time, the L-shaped metal fitting 8 is preferably welded in advance before the heavy anticorrosion coating is applied.

And the flat cover member 10 for covering a joint part is prepared beforehand, and after actually putting the hat-type steel sheet pile to which the L-shaped metal fitting 8 is fixed in the field, the edge part of the cover member 10 is each set. It fits in the groove part which an adjacent steel sheet pile opposes, and it attaches so that a joint part may be covered.
In this case, the cover member 10 has a flat plate shape with a bulge at the center so as not to interfere with the protruding claw portion 2.

  Thereafter, the gap formed between the cover member 10 and the claw portion 2 is filled with a filler 11 such as resin or mortar to prevent the claw portion from contacting seawater or the like.

  FIG. 4 shows another embodiment of the present invention. In this embodiment, the L-shaped metal fitting is fixed so that the overhanging portion 9 is located on the side opposite to the claw portion 2, and the groove portion is formed on the web portion 4 side of the steel sheet pile 1. In addition, bent portions 13 directed inward are formed at both ends of the cover member 12.

Then, after the hat-shaped steel sheet pile is actually placed on site, the bent members at both ends of the cover member are fitted into the respective groove portions of the L-shaped metal fittings of the adjacent steel sheet piles, so that the L-shaped metal fitting is formed by the cover member 12. A cover member 12 is attached so as to cover 8 and the joint portion 7. Thereafter, as in the case of FIG. 3, a filler 11 such as a resin or mortar is filled in an interval formed between the cover member 12 and the claw portion 2.
In this embodiment, since the L-shaped metal fitting 8 can be covered with the cover member 12, it is particularly preferable to use it in a place where an appearance is required.

  In the above embodiment, although the example which attaches a cover member to the side used as the trough of a steel sheet pile structure was demonstrated, the structure attached to the side used as the mountain opposite to FIG. However, in general, the example of FIGS. 3 and 4 is more preferable because it is provided at a retracted position.

The L-shaped metal fitting used in the present invention is not particularly limited as long as a slit for attaching a cover can be formed, but a commercially available steel angle material is made to have a length equal to or less than the width of the heavy anticorrosion coating layer. It is convenient to cut and use, which is advantageous in terms of cost.
The L-shaped bracket may be provided with a heavy anticorrosion coating. The length of the L-shaped metal fitting is a length that particularly requires the anticorrosion of the joint, but in practice, the length of the heavy anticorrosion coating is sufficient.

As the cover member, one formed of a highly corrosion-resistant metal plate, polyethylene resin, fiber reinforced plastic (FRP), or the like can be used.
The material of the metal plate is preferably a material that has a practically low corrosion rate in seawater, that is, 10 μm / year or less and that hardly causes crevice corrosion, and has high corrosion resistance even in a seawater environment containing 2% or more of molybdenum. Stainless steel, Ni-based corrosion resistant alloy, titanium alloy and the like can be used, and titanium alloy is particularly desirable. Moreover, what formed the high corrosion-resistant film | membrane on the normal steel plate can also be used.

Regarding the thickness of the cover member, there is a thickness suitable for the material used in terms of the strength of the member, workability at the time of attachment, cost, and the like. In the case of a metal plate, a range of 0.2 mm to 2 mm is desirable. If it is less than 0.2 mm, the rigidity is insufficient and it is difficult to maintain the shape. On the other hand, if it exceeds 2 mm, it is difficult to mold and it is not suitable.
In the case of polyethylene resin and fiber reinforced plastic, if it is thin, the required strength cannot be ensured, so that a certain thickness is required, and a range of 1 to 5 mm is desirable.

  Although it is desirable that the cover member can be easily deformed so that the cover member can be securely attached even if there is a shift in the joint after placement, the thickness of the groove formed by the L-shaped bracket and the distance between the grooves It is desirable to allow the cover member to be smoothly attached between the L-shaped brackets with a slight margin.

  Resin or mortar is used as the filler embedded in the cover member after the placement. Although it does not specifically limit as resin, Generally a polyurethane resin and an epoxy resin are used. Further, foamable rubber may be used. By using these resins and mortars, there is no gap between the cover member and the claw portion, and deterioration due to water permeation or the like is suppressed as much as possible, so the durability life of the joint portion is greatly increased.

  The aspect of the heavy anticorrosion coating is not particularly limited in the present invention, but generally, heavy anticorrosion of 500 μm or more is performed using a polyolefin or polyurethane resin. At that time, an undercoat layer using epoxy or the like may be provided, and a heavy anticorrosion coating may be applied thereon.

  Although it does not specifically limit also about the steel grade of the steel sheet pile used for this invention, C, Si, Mn and nitrogen, the steel which controlled oxygen, or also Cu, Ni, Cr, Mo, Nb, An alloy steel to which elements such as Ti, Al, Mg, V, and Ca have been added and subjected to shape processing by a hot rolling process is used.

The present invention will be further described below using examples.
An L-shaped metal fitting having a length of 3 m was attached by welding in the direction of FIG. 3 in the vicinity of the claw portion on the mountain side of the hat-type steel sheet pile (length 10 m). After that, including the L-shaped bracket welded to the 3m portion corresponding to the tidal zone, the surface of the steel material was rusted by blasting, followed by primer treatment, primer coating, polyurethane coating, and 3mm thick polyurethane heavy anticorrosion coating Went.

After placing them with a bible hammer at a test site on the beach, in some joints, a cover member made of FRP is attached between the L-shaped brackets as shown in Fig. 3, and mortar is pumped from the sealed bottom to the inside of the cover. And filled. In the remaining joints, the cover member was not attached and the state at the time of placing was kept.
After the construction, 6 months passed and the change in appearance was observed. The joint part to which the cover member as the comparative example is not attached has rusted and has been deteriorated. The example of the present invention to which other cover members were attached had a very good appearance with no occurrence of rust and no resin outflow.

It is a figure which shows the external view of a hat-type steel sheet pile. It is a figure which shows the joint part of a hat-type steel sheet pile. It is the figure which provided the cover member which concerns on 1 embodiment of this invention in the joint part of a hat-type steel sheet pile, (a) is a front view, (b) is an end elevation. It is a figure which concerns on other embodiment of this invention, (a) is a front view, (b) is an end view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hat type steel sheet pile 2 Claw part of hat type steel sheet pile 3 Flange part of hat type steel sheet pile 4 Web part of hat type steel sheet pile 5 Arm part of hat type steel sheet pile 6 Heavy anticorrosion coating 7 Joint part of hat type steel sheet pile 8 L type metal fitting 9 L type Overhanging portion of metal fitting 10 Cover member in one embodiment 11 Filler 12 Cover member in another embodiment 13 Bending portion of cover member 12

Claims (7)

  Steel sheet pile structure in which a heavy anticorrosion coating is applied to one surface and a plurality of steel sheet piles having a hat-shaped cross section are connected by joints formed by fitting claws formed at the end portions A cover member that covers an L-shaped metal fitting in advance along the claw portion before connection in the vicinity of the claw portion of the surface on which the heavy anticorrosion coating of the steel sheet pile is applied, and covers the joint portion after connection The end of the fitting is fitted into the groove formed between the overhanging portion of the L-shaped metal fitting and the steel sheet pile, and is arranged in the joint portion, and is filled in the space formed between the cover member and the claw portion. A structure of a steel sheet pile characterized by being filled with a material.   The L-shaped bracket is fixed so that the overhanging portion is located on the claw portion side, and the end of the cover member is fitted in the groove portion facing the adjacent steel sheet pile, and the L-shaped bracket is located between the L-shaped brackets. The structure of the steel sheet pile according to claim 1, wherein the steel sheet pile structure is disposed on the surface.   The L-shaped metal fitting is fixed so that the overhanging portion is located on the opposite side of the claw portion, and bent portions directed inward are formed at both end portions of the cover, and the bent portion is connected to the groove portion. The steel sheet pile structure according to claim 1, wherein the cover member is disposed so as to cover the L-shaped metal fitting by being fitted to the steel sheet.   The steel sheet pile structure according to claim 1, wherein the cover member is made of a reinforced fiber plastic, a resin, or a corrosion-resistant metal material.   The steel sheet pile structure according to claim 1, wherein a cross-section with a heavy anti-corrosion coating on one surface is a hat-shaped steel sheet pile, and the surface of the steel sheet pile with a heavy anti-corrosion coating. A steel sheet pile, wherein an L-shaped bracket for attaching a cover member covering the joint portion is fixed along the claw portion in the vicinity of the claw portion.   The steel sheet pile according to claim 5, wherein the L-shaped bracket is fixed so that a protruding portion is positioned on a claw portion side.   The steel sheet pile according to claim 5, wherein the L-shaped bracket is fixed so that a protruding portion is located on a side opposite to the claw portion.

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