JP2515565B2 - Coated anticorrosion structure of sheet pile - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sheet pile that is driven into water for seawalls, embankments, etc., or a sheet pile that covers the water side of the sheet pile to prevent corrosion of these sheet piles. The present invention relates to a coated anticorrosion structure.

2. Description of the Related Art A sheet pile driven into water, for example, under the sea for revetment, embankment, etc., is repeatedly contacted with both seawater and air near the surface of the sea, and is prone to significant corrosion in this portion after long-term use.

For this reason, there is known a covered anticorrosion structure in which the sea surface of the sheet pile on the sea side is covered with an anticorrosion cover such as a plastic material, and a filler such as mortar is filled between the anticorrosion cover and the sheet pile. No. 60-45750. According to this proposal, as shown in FIG. 8, a steel pipe sheet pile wall 01 is constructed by driving a plurality of steel pipes 02 into the sea while connecting them with joints 03, and each steel pipe 02 has Brackets 04 having U-shaped cross-sections extending in the vertical direction are attached by bolts 05 to the sea side at two locations close to the joint 03. An anticorrosion cover 06 made of a fiber-reinforced resin (FRP) oriented in the longitudinal direction and having an arcuate cross section is attached so as to cover substantially half the circumferential surface of the steel pipe 02 between the brackets 04, 04. The edge of is overlapped with the angle member 07 and is fixed to the bracket 04 by the bolt 08.

A pair of FRP auxiliary covers 09 oriented in the longitudinal direction are interposed between the pair of facing angle members 07, 07, and between the anticorrosion cover 06 and the auxiliary cover 09 and the outer surface of the steel pipe sheet pile 01. A filling material such as mortar is filled in the space formed in. At the lower ends of the anticorrosion cover 06 and the auxiliary cover 09, a bottom plate for sealing that closes the space between the steel pipe sheet pile wall 01 is provided. In this conventional example, the bracket 04 is a bolt
Although it is attached to the steel pipe 02 by 05, a similar bracket may be attached to the steel pipe 02 by welding. Then, the above-mentioned anticorrosion cover 06, auxiliary cover 09 and bracket 04
Is placed near the water surface after the steel pipe 02 is placed.

Problems to be Solved by the Invention By the way, in the above-described coated anticorrosion structure, the steel pipe is
When the mounting position of the bracket 04 with respect to 02 becomes far from the joint 03, the distance between the auxiliary cover 09 and the joint 03 becomes wide,
Since the amount of filling material that must be filled in this portion is large, which is uneconomical, and the sealing property of the joint 03 portion tends to deteriorate, the bracket 04 is the joint as much as possible.
It is desirable to attach it to the steel pipe 02 at a position close to 03.

However, since the gap between the adjacent steel pipes 02, 02 is small at the position close to the joint 03, it is difficult to attach the bracket to the outer peripheral surface of each steel pipe by bolts or by welding in this gap space. , It is extremely difficult to attach the bracket on one side after attaching the bracket on the other side.

Therefore, conventionally, only the upper and lower ends of the bracket, which are easily approached from above or below, have been fixed to the steel pipe, and this is the same for the attachment of the anticorrosion cover to the bracket. As a result, when a filler such as mortar is poured between the anticorrosion cover and the steel pipe sheet pile and filled, the longitudinal center of the anticorrosion cover swells due to the injection pressure, and the anticorrosion cover is deformed. However, there are problems such as falling off, and inability to secure a uniform thickness of the filler.

Means and Actions for Solving Problems The present invention has been made in view of such circumstances, and in the present invention, the anticorrosion cover is provided on the water side surface of sheet piles that are driven into water adjacent to each other. Of the sheet pile, which is attached to the anticorrosion cover and is attached to the sheet pile by a mounting piece that is welded to the sheet pile, spaced apart from the sheet pile surface, and filling a filler between the anticorrosion cover and the sheet pile. In the coated anticorrosion structure, the attachment pieces are provided at least at the upper end portion, the intermediate portion and the lower end portion of the anticorrosion cover, and a window is opened at a position adjacent to the attachment piece at the intermediate portion of the anticorrosion cover, and the window is defined as Provide a removable panel cover that closes from the outside of the anticorrosion cover.

In the present invention, the attachment of the anticorrosion cover to the sheet pile is
It is carried out by welding the attachment piece attached to the anticorrosion cover to the sheet pile.In this case, the welding of the attachment piece to the sheet pile at the upper end and the lower end of the anticorrosion cover is performed above and below the anticorrosion cover as in the conventional case. It can be done very easily from below. However, in the case of the middle portion where welding was difficult in the past, by inserting the welding rod from the outside to the inside of the anticorrosion cover through the window opened adjacent to the mounting piece in the middle portion, this can also be done very easily. The mounting piece can be welded to the sheet pile.

Therefore, according to the present invention, even in a narrow space close to the joint portion of each steel pipe of the steel pipe sheet pile, the edge of the anticorrosion cover can be reliably fixed to the steel pipe over the upper portion, the intermediate portion, and the lower portion. It is possible to reduce the required amount of the filler by narrowing the gap between the auxiliary cover provided between the anticorrosion covers and the joint portion, and to prevent the middle portion of the anticorrosion cover from bulging and falling due to the filling material injection pressure. .

Further, according to the present invention, the anticorrosion cover is fixed to the sheet pile not only at both widthwise edges of the anticorrosion cover but also at the central portion between the both edges, over the upper end portion, the lower end portion, and the intermediate portion in the vertical direction. However, it is possible to more reliably prevent the anticorrosion cover from bulging and falling off, and it can be advantageously applied not only to the steel pipe sheet pile but also to the steel sheet pile.

Embodiment FIG. 1 to FIG. 5 show an embodiment of the present invention. Reference numeral 1 denotes a steel pipe sheet pile, and joint steel pipes 3 oriented in the generatrix direction are integrally attached by welding to the diametrically opposed positions of the outer peripheral surface of the main body steel pipe 2. The slit 4 for fitting the joint steel pipe 3 of the adjacent steel pipe sheet pile 1 to the joint steel pipe 3 in a freely attachable / detachable manner.
Are formed along the generatrix direction, and after one steel pipe sheet pile 1 has been driven into the seabed, the joint steel pipe 3 of this driven steel pipe sheet pile 1 and the joint steel pipe 3 of the adjacent steel pipe sheet pile 1 are provided in the respective slits 4. The two steel pipes 3 are slid on each other and the adjacent steel pipe sheet piles 1 are driven downward and driven into the sea bottom. By repeating such work, the boundary line between the land 5 side and the sea 6 side is repeated. A series of steel pipe sheet piles 1, 1 ... Is laid along the road to prevent the soil on the land 5 side from collapsing to the sea 6 side.

The surface of the steel pipe sheet pile 1 on the side of the sea 6 is in contact with seawater, and in particular, the portions above and below the sea surface, which repeatedly come into contact with both seawater and air, are easily corroded. A coated anticorrosion including a mortar (filler) 8 filled between the anticorrosion cover 7 and the surface of the steel pipe sheet pile 1 is applied.

The anticorrosion cover 7 is made of FRP, has a semi-cylindrical shape, covers the outer peripheral surface of the steel pipe sheet pile 1 over a substantially semicircle with a predetermined gap between the outer peripheral surface and the sea surface. Near the position, it extends vertically along the steel pipe sheet pile 1. That is, mounting pieces 9 and 9 made of chevron steel are fixed to the inner surface of the anticorrosion cover 7 along both widthwise edges by screws or the like, and a similar mounting piece 10 is also provided in the widthwise central portion. It is fixed. Then, by welding the protruding end portions of these mounting pieces 9 and 10 to the peripheral surface of the main body steel pipe 2 along the welding line 11, the anticorrosion cover 7 is provided on the peripheral surface of the main body steel pipe 2 with a space from the peripheral surface. Installed.

By the way, the welding of the mounting pieces 9 and 10 to the main body steel pipe 2 can be easily performed at the upper end and the lower end of the mounting pieces 9 and 10 by directing the welding rods to the welding line 11 from above and below, respectively. However, it is impossible or extremely difficult to weld in the intermediate portion in the vertical direction. Therefore, as shown in FIG. 3, the anticorrosion cover 7 is provided with a window 12 at a position adjacent to the attachment pieces 9 and 10 in the intermediate portion in the vertical direction. Therefore, the welding rod can be directed through this window 12 to the intermediate welding line 11a (FIG. 2) and this portion can be welded very easily. In the illustrated example, the attachment pieces 9 and 10 are vertically passed continuously from the upper end to the lower end of the anticorrosion cover 7, but different attachment pieces may be fixed to the upper end portion, the intermediate portion and the lower end portion, respectively. On the upper edge of the anticorrosion cover 7, a hanging metal fitting 13 having the same sectional shape as that of the attachment pieces 9 and 10 is fixed in the same manner. When the anticorrosion cover 7 is attached to the main body steel pipe 2, the anticorrosion cover 7 is The welding is performed by suspending with a wire or the like through the suspending metal 13 and continuously carried and held at a predetermined position, and the suspending metal 13 itself is also welded to the main body steel pipe 2.

In this way, the anticorrosion cover 7 is welded to the main body steel pipe 2 via the attachment pieces 9 and 10 and the hanging metal fitting 13, and then the window 12 is closed from the outside by the panel cover 14. Therefore, the anticorrosion cover 7 has bolt holes along the periphery of the window 12,
Cap nuts 15 are fixed to the inner surface of the anticorrosion cover 7 in alignment with these bolt holes. Panel cover 14
As shown in FIG. 5, the blind plate 16 is lined with a packing material 17 made of foam rubber or the like on the peripheral edge of the inner surface of the blind plate 16, and bolt holes are formed through the blind plate 16 and the packing material 17.
A bolt 19 (Figs. 1 and 2) is passed through 18 and screwed into the cap nut 15 so that the window 12 is secured to the outer surface of the anticorrosion cover 7.
Seal.

A bifurcated auxiliary cover holding portion 20 is formed on both end edges of the anticorrosion cover 7 in the width direction.
An anti-corrosion cover is formed by inserting an auxiliary cover 21 having the same length as the anti-corrosion cover 7 between the auxiliary-cover holding portions 20 and 20 facing each other.
Block 7 and 7. Then, the mortar 8 is injected into the space formed between the anticorrosion cover 7, the auxiliary cover 21 and the steel pipe sheet pile 1 and hardened.

Since the present embodiment is configured as described above, the attachment piece 9 of the anticorrosion cover 7 can be securely welded to the main body steel pipe 2 not only at the upper end portion and the lower end portion but also at the middle portion, and moreover, the central portion in the width direction. Similarly, the mounting piece 10 provided at the upper end can be welded over the upper end portion, the intermediate portion, and the lower end portion. Therefore, when the mortar 8 is poured, the middle portion of the anticorrosion cover 7 does not bulge due to the injection pressure, and the thickness of the mortar 8 does not become uneven, and the anticorrosion cover 7 does not drop off. In addition, the mounting pieces 9 at both end edges
Does not need to be welded from the edge of the anticorrosion cover 7,
The anticorrosion cover 7 can be extended to a position close to the joint steel pipe 3, whereby the gap between the auxiliary cover 21 and the joint steel pipe 3 can be narrowed to reduce the required amount of mortar to be injected into the portion. . It is also possible to provide the windows 12 at several positions in the upper and lower parts in the middle part to further increase the total length of the welding line 11a.

6 and 7 show an embodiment in which the sea 6 side of the steel sheet pile 23 connected through the joint portion 22 is provided with the coated anticorrosion structure according to the present invention, and the anticorrosion cover 24 in this embodiment is a steel sheet pile.
It has a trapezoidal cross-section so that it will fit along the 23 sides at approximately equal intervals. And the mounting pieces 9 and 10 similar to those in the above-mentioned embodiment are fixedly provided on the inner surface of the anticorrosion cover 24.
The anticorrosion cover 24 is fixed to the steel sheet pile 23 by welding the tip of the steel sheet pile 23 to the steel sheet pile 23. A window 12 is provided at a position adjacent to the mounting pieces 9 and 10 in the vertical middle portion of the anticorrosion cover 24 in the same manner as in the above embodiment, and the middle portion of the mounting pieces 9 and 10 is connected to the steel sheet pile through the window 12. It can be welded to 23. The post-welding window 12 is closed by a panel cover 14.
The space between the anticorrosion cover 24 and the steel sheet pile 23 is filled with the mortar 8 because the space between the adjacent anticorrosion covers 24 and 24 is closed by the auxiliary cover 21.

In addition, since a bottom plate for sealing (not shown) is provided between the lower ends of the anticorrosion covers 7 and 24 and the steel pipe sheet pile 1 and the steel sheet pile 23 through both of the above-described embodiments, the injected mortar 8 is moved downward. It does not fall out.

As described above, in the present invention, the anticorrosion cover is attached to the water side surface of the sheet piles that are driven into the water adjacent to each other, through the attachment piece attached to the anticorrosion cover and welded to the sheet pile. In the covered anticorrosion structure of the sheet pile, which is attached at a distance from the sheet pile surface and is filled with a filler between the sheet anticorrosion cover and the sheet pile, at least the attachment piece has at least the upper end portion and the intermediate portion of the sheet anticorrosion cover. And a lower end portion, a window is opened at a position adjacent to the attachment piece of the intermediate portion of the anticorrosion cover, and a removable panel cover for closing the window from the outside of the anticorrosion cover is provided. Can be extremely easily and surely welded to the sheet pile via the attachment piece not only at the upper and lower end portions but also at the intermediate portion thereof, and also at the widthwise both end portions as well as at the central portion thereof. Anticorrosion hippo When the filling material is filled between the sheet and the sheet pile, the filling pressure does not cause the intermediate portion of the anticorrosion cover to bulge, so that the thickness of the filling material does not become uneven and the anticorrosion cover does not drop off.

Further, this anticorrosion cover can securely fix the edge of the anticorrosion cover to the steel pipe over the upper, middle and lower parts even in a narrow space close to the joint of each steel pipe of the steel pipe sheet pile. The space between the auxiliary cover provided between the adjacent anticorrosion covers and the joint part can be narrowed to reduce the required amount of the filler.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a steel pipe sheet pile wall according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a partial perspective view showing an inner surface of an anticorrosion cover of the same embodiment. Fig. IV- in Fig. 3
A sectional view taken along line IV, FIG. 5 is a perspective view showing the inner surface of the panel cover, FIG. 6 is a lateral sectional view of a steel sheet pile wall according to another embodiment of the present invention, and FIG. FIG. 8 is a partial perspective view showing the inner surface of the anticorrosion cover, and FIG. 8 is a transverse sectional view of a conventional steel pipe sheet pile wall. 1 ... Steel pipe sheet pile, 2 ... Main body steel pipe, 3 ... Joint steel pipe, 4 ... Slit, 5 ... Land, 6 ... Sea, 7 ... Anticorrosion cover, 8 ... Mortar, 9,10 ... Mounting piece, 11 ... Welding line, 12 ... Windows, 13 ... hanging fittings,
14 ... Panel cover, 15 ... Cap nut, 16 ... Blind plate, 17 ... Packing material, 18 ... Bolt hole, 19 ... Bolt, 20 ... Auxiliary cover holding part, 21 ... Auxiliary cover, 22 ... Joint part, 23 ... Steel sheet pile ,twenty four…
Anticorrosion cover.

Claims (1)

(57) [Claims] 1. An anticorrosion cover is provided on the water side surface of sheet piles that are driven into water adjacent to each other, and is separated from the sheet pile surface via a mounting piece attached to the anticorrosion cover and welded to the sheet pile. In a covered anticorrosion structure of a sheet pile formed by filling a filler between the anticorrosion cover and the sheet pile, the mounting piece is provided at least at the upper end portion, the intermediate portion and the lower end portion of the anticorrosion cover, A coated anticorrosion structure for sheet piles, characterized in that a window is opened at a position adjacent to the attachment piece of the intermediate portion of the anticorrosion cover, and a removable panel cover is provided to close the window from the outside of the anticorrosion cover.