JPH074551U - Corrosion-proof mortar cover for steel sheet pile wall - Google Patents

Abstract

(57) [Abstract] [Purpose] An improved FRP (fiber reinforced plastic) cover that doubles as a form for filling anti-corrosion mortar on the wall of steel sheet piles such as quays, etc. Completely protect it from corrosion. [Structure] Conventionally, an FRP flat plate is bolted to a section steel welded to a steel sheet pile 2. In this invention, an FRP semi-cylindrical material 20 that covers the sheet pile convex surface 2a and a FRP strip plate material 21 that covers the sheet pile concave surface 2b and also covers the mounting portion of the semi-cylindrical material 20 are arranged side by side in a corrugated manner. The semi-cylindrical material 20 is fixed by the insertion engaging portion 23. Therefore, the filling mortar wraps and protects the steel material and bolt inside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an anticorrosion mortar cover for a steel sheet pile wall surface.

[0002]

[Prior art]

 FIG. 6 shows a conventional anticorrosion mortar cover for a steel sheet pile quay. No. 1 is a beetle that follows the road surface, 2 is steel sheet pile, 3 is filled mortar, 4 is a cover plate which is a flat plate made of FRP (fiber reinforced plastic), and 5 is a sheet plate 2 for attaching the cover plate 4. Angle steel welded to the convex surface, 6 is a stainless steel bolt, and 7 is a mortar injection port. Before attaching the cover plate 4, the bottom plate support member 8 is welded to the lower concave surface of the sheet pile 2, the bracket 9 is welded to the convex portion of the sheet pile 2, and the H-shaped steel for supporting the bottom plate 10, the floor plate 11, and the bottom plate 12 are installed in this order. is doing. After bolting the cover plate 4 to the angle steel 5, the mortar is press-fitted from the inlet 7 to fill up to the bottom of the beaker stone 1, and after curing for several days, the diving engineer applies the bottom plate support 8 and the bracket 9. It is melt-fused in water and all steel materials such as the H-shaped steel 10, floor plate 11, bottom plate 12 and the like are recovered. As a special example, there was also a mortar cover for a quay where steel pipes were laid side by side as sheet piles, and an FRP material having a concentric arc cross-section with the steel pipes and a strip-shaped FRP material connecting the steel pipes.

[0003]

[Problems to be solved by the device]

 The above-mentioned prior art is one in which flat frame plates are erected and lined up as is the common sense of general concrete formwork, but there is a fatal drawback for use in anticorrosion mortar. That is, the mission of the anticorrosion motor is to shield the steel material forming the wall surface from external moisture, but the FRP cover plate 4 is bolted to the angle steel 5 which is an extension of the steel material. Outside water may easily reach the angle steel 5 from the seam of the cover plate 4 and cause corrosion, and moisture and rust may reach the steel sheet pile 2 along the boundary between the angle steel 5 and the mortar 3 after many years. It was . Corrosion of steel propagates. The invention aims at developing a mortar cover which does not have the abovementioned drawbacks.

[0004]

[Means for Solving the Problems]

 The steel sheet pile wall anticorrosion mortar cover of the present invention is a FRP cover that also serves as a form for filling the anticorrosion mortar with the wall of which the concave and convex surfaces of the steel sheet pile are alternately arranged side by side. , A large number of FRP semi-cylindrical materials standing upright side by side covering the concave surfaces of the left and right sheet piles, and the above-mentioned semi-cylinders welded in a twisted state along each edge of the convex surface of each sheet pile in accordance with the twist distortion of the sheet pile. A large number of FRP strips lined up side by side to cover the material mounting die steel, the concave surfaces of the sheet piles, and the mounting portions of the semi-cylindrical material that have entered into the left and right sides, and the center of the above-mentioned mounting portions on both edges of each semi-cylindrical material It is characterized in that an FRP insertion engaging portion which is attached in advance so as to receive the strip plate edge portion is provided on the outer surface of the side.

[0005]

[Action]

 According to common sense of concrete formwork, this invention eliminates the conventional method of arranging flat cover plates as frame plates, and arranges semi-cylindrical materials and strip plates in a corrugated manner along the uneven steel sheet pile wall surface. The semi-cylindrical material not only covers the convex surface of the sheet pile, but also allows the edge of the semi-cylindrical material to enter the adjacent concave surface and attach the edge to the mounting steel. Therefore, since the mounting parts on both sides of the semi-cylindrical material are located close to the concave surface, they can be completely covered by the strip plate material standing between the left and right semi-cylindrical materials. Therefore, the steel material and bolts of the mounting portion are completely wrapped with the filling mortar. All of the sheet piles have some torsional strain, but there is no problem because the above-mentioned shape steel is welded at the site. Since the strip plate member is supported by the FRP insertion engaging portions along both edges of the semi-cylindrical member, no mounting bolt is required. Therefore, even if outside moisture enters from the joint between the semi-cylindrical material and the strip material, it cannot contact with steel materials or mounting bolts other than mortar and FRP materials.

[0006]

【Example】

 FIG. 1 is an explanatory view of a steel sheet pile quay to which the present invention is applied, and FIG. 2 is a partially enlarged sectional view thereof. The beveled stone 1, the steel sheet pile 2, and the mortar 3 are the same as the conventional example of FIG. The convex surface of the sheet pile 2 is 2a and the concave surface is 2b. The FRP semi-cylindrical material, which is the main material of the mortar cover of the present invention, is 20, and the strip plate material is 21. The semi-cylindrical material mounting die steel is 22, and the strip plate material insertion engaging portion is 23. The name of a half cylinder includes all gutter-shaped ones. The plug-in engaging portion 23 is an acute angle chevron member made of FRP, and is preliminarily adhered to both edges of the outer surface of the semi-cylindrical material 20. There is a bolt hole in the edge portion closer to the end than the insertion engagement position, and the semi-cylindrical material 20 is attached to the shape steel 22 by the attachment bolt 30 as illustrated on the left side of FIG. However, instead of using the mounting bolts, it is also possible to mount with an adhesive as shown on the right side of FIG. In that case, before the semi-cylindrical material 20 is brought into water, coating the same type of adhesive as the adhesive on the mounting edge also prevents rusting. In water, it is easier than tightening by bolting by applying an adhesive agent to the shape steel 20 side and pressing the mounting edge of the semi-cylindrical material 20. However, even when the semi-cylindrical material 20 is attached to the shape steel 20 with an adhesive, it is better to provide the positioning bolt holes at the top and bottom.

Whether the semi-cylindrical material 20 is attached with bolts or adhesives, it is necessary that the counterpart die steel 22 is welded to the sheet pile 2 so as to match the attachment edge of the semi-cylindrical material 20. . In this embodiment, a triangular reinforcing plate 22a is welded to the shape steel 22 in advance, and this is brought into water, applied to the convex edge portion of the sheet pile 2 and welded in water. This welding work is easy if the mounting jig 31 of FIG. 5 is used. In brief, how to use the jig 31 is such that the upper end of the vertical member 31a is brought into contact with the lower surface of the bevel stone 1, and the upper and lower suction cups 32 are attached on the center line of the convex surface 2a of the sheet pile. Next, temporary steel bolts (not shown) are respectively fastened to the upper and lower support members 33 and 34, and the steel plates 22 are immersed in water and placed along both edges of the sheet pile convex surface 2a. Then, first, the lower end is pressed and welded, and then a similar twist is made in the shaped steel by the correction plates and the set screws on both sides of the upper support 33, and then welded. The invention was achieved by making it possible to weld the steel molds on both sides to a sheet pile with twist distortion that is difficult to avoid with this jig.

The FRP bottom plate 20a of the semi-cylindrical member 20 is built in from the beginning, and the FRP bottom plate 21a of the sheet pile concave surface 2b is provided with the left and right small diameter rods 24 attached to the lower end of the shape steel 22, as shown in FIG. It is hung with one screw rod 25 attached to the center of the sheet pile concave surface 2b. The bottom plate 20a is provided with slits 26 that prevent the mortar from leaking so much that the mortar conforms to the corners of the convex surface. It is needless to say that the bottom plate is necessary only when filling the mortar, and may be temporarily supported by adhering a FRP receiving material instead of using a steel material such as a screw rod. The bottom plate 20a of the semi-cylindrical material 20 may also be made separately instead of being built-in. The strip 21 is in the shape of a strip as shown in FIGS. 3 and 4, and has a mortar inlet 7 at its lower end and a check valve plate 27 on the back side for stopping the mortar from flowing out after the injection. At the upper end, a slide plate 28 is tightened with a nut so that the height can be adjusted. The notch 29 on the side edge is for avoiding the head of each bolt 30 when the semi-cylindrical material 20 is attached only by the attachment bolt 30. Although one embodiment has been described above, it is needless to say that the present invention can be variously changed and applied according to the implementation conditions by the person in charge without changing the gist thereof. It is easy to change and change the half cylinder into another similar shape.

[0009]

[Effect of device]

 The present invention solves the conventional serious drawback of the anticorrosion mortar cover on the wall of the steel sheet pile, that is, the problem that the water entering from the seam of the cover sheet can easily contact the steel material inside. That is, according to the present invention, the FRP plate covering the convex surface of the steel sheet pile is made of a semi-cylindrical material, and the FRP plate is mounted on the mounting die steel when both edges thereof enter the adjacent concave surface. Since the FRP strip plate material that closes the semi-cylindrical materials covers the mounting portion together with the concave surface of the steel sheet pile, the mounting portion of the shaped steel and the semi-cylindrical material is wrapped with the filled mortar. The problem of torsional strain, which is unavoidable for steel sheet piles, was solved by similarly twisting and welding the above-mentioned shape steel in the underwater field.

Since the strip plate material is fixed by inserting it into the insertion engaging portions of both edges of the semi-cylindrical material regardless of the shape steel and the bolts, moisture invades from the joint between the semi-cylindrical material which is the FRP cover plate and the strip plate material. Even if it cannot reach the steel member in the mortar, the durability of the steel sheet pile wall surface is dramatically improved. The FRP semi-cylindrical material of this invention has a cylindrical shape that is advantageous for the internal pressure during mortar injection, and the strip plate material is also narrow, so it is much thinner and lighter than the conventional flat cover plate. Become. The amount of mortar used is also reduced because it does not become uselessly thick with the concave sheet pile unlike in the past. Moreover, the appearance is corrugated, and it is beautiful because there is no bolt head.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view of an embodiment of the present invention.

2 is a partially enlarged cross-sectional view of FIG.

FIG. 3 is a front view of an FRP strip plate material.

FIG. 4 is a side view of FIG.

FIG. 5 is a perspective view of a jig for welding a shaped steel.

FIG. 6 is an explanatory view of a conventional technique.

[Explanation of symbols]

 20 semi-cylindrical material 21 strip plate material 22 mounting type steel 23 plug-in engaging part

Claims (1)

[Scope of utility model registration request] 1. An FRP that also serves as a mold for filling an anticorrosive mortar on a wall surface in which concave and convex surfaces of a steel sheet pile are alternately arranged side by side.
In the made cover, a number of FRP semi-cylindrical materials that line up one sheet pile convex surface and a part of the right and left sheet pile concave surfaces are lined up, and twisted according to the twist distortion of the sheet pile along each edge of each sheet pile convex surface. The above-mentioned semi-cylindrical material mounting shape steels welded in a state, each sheet pile concave surface, and a large number of FRP band plate materials that line up to cover the mounting portions of the above-mentioned semi-cylindrical material that have entered to the left and right thereof, and each of the semi-cylindrical material both edges FR which is attached in advance to the outer surface of the central portion of the mounting portion so as to receive the edge portion of the strip plate.
A P-made insertion engaging portion, and a corrosion preventive mortar for the wall surface of the steel sheet pile,
cover.