JPH0342113Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical Field] The present invention relates to a structure for making steel pipe sheet piles constructed as sheet piles for seawall protection against seawater corrosion. [Background technology] Steel sheet piles are generally constructed for the protection of quay walls, but instead of steel sheet piles, steel pipe sheet piles, which are formed by protruding connecting pieces on both sides of circular steel pipes, have been used. There is. This steel pipe sheet pile is constructed on the quay by connecting a large number of sheets in parallel by engaging the ends of the connecting pieces, but the outer surface of the connecting pieces and the half circumferential surface of the steel pipes are exposed to seawater. Corrosion is likely to occur, especially in the splash zone between high tide and low tide, and in areas where seawater is splashed, corrosion is likely to occur due to repeated contact with seawater and air. It is necessary to carry out anti-corrosion treatment. In the case of steel sheet piles, the applicant has filed Japanese Patent Application No. 58-66229
192135 Publication), in which a cover plate is attached to the surface of a steel sheet pile by bolts, and a corrosion-resistant material is filled between the steel sheet pile and the cover plate to protect the steel sheet pile from corrosion. Corrosion prevention can be achieved by protecting the pipe with a cover plate, but since the surface of steel pipe sheet piles is curved, the structure of such steel sheet piles cannot be applied as is. Therefore, it has been desired to have a simple structure and reliable corrosion protection for steel pipe sheet piles. [Purpose of the invention] The present invention was made in view of the above points, and its purpose is to provide a corrosion-resistant structure for steel pipe sheet piles that has a simple structure and can provide reliable corrosion protection. It is. [Disclosure of the invention] However, the corrosion-resistant structure of steel pipe sheet piles according to the invention connects the connecting pieces 2 protruding from both side surfaces of the steel pipes 1 to connect a large number of steel pipes 1 from side to side, and connects each connecting piece 2. A mounting tool 4 having a plurality of upper and lower bolts 3 protruding from the outer surface of the cover plate 5 is fixed, a mounting hole 6 is drilled in one end of the cover plate 5, and a connecting piece 7 is attached to the other end of the auxiliary cover plate. A mounting hole 9 is bored at one end of 8, and a connecting piece 10 is attached to the other end.
The cover plate 5 and the auxiliary cover plate 8 are
and the connecting pieces 7 and 10 of the auxiliary cover plate 8 are arranged on the outer surface of the steel pipe 1 between the connecting pieces 2 on both sides of the steel pipe 1, with the connecting pieces 7 and 10 of the auxiliary cover plate 8 facing each other, and the attachment holes 6 of the cover plate 5 and the auxiliary cover plate 8 are connected to each other. The mounting hole 9 of each connecting piece 2
A connecting cover plate 12 with connecting holes 11 bored at both ends is placed between adjacent steel pipes 1, and the connecting holes 11 are passed through the bolts 3, and the bolts 3 At the same time, the bolts and nuts 15 passed through both the connecting pieces 7 and 10 of the cover plate 5 and the auxiliary cover plate 8 are used to connect both connecting pieces 7 and 10, and the steel pipe 1 and the connecting piece 2 are connected. Cover plate 5, auxiliary cover plate 8 and connecting cover plate 1
2, a corrosion-resistant material 14 is filled between each cover plate 5, 8,
The above object has been achieved by using No. 12, and the present invention will be described in detail below with reference to Examples. The steel pipe sheet pile A is formed by protruding a pair of connecting pieces 2, 2 from the outer surfaces of both sides of a circular steel pipe 1.
An engaging portion 16 is formed at the tip of each connecting piece 2 . A large number of these steel pipe sheet piles A are connected by engaging the engaging portions 16 of the connecting pieces 2 with each other, and are installed on the quay wall 30 in this state. In addition, the cover plate 5, the auxiliary cover plate 8, and the connecting cover plate 12 are each made of glass fiber reinforced thermoplastic resin.
In particular, it is preferably formed from a plate of glass fiber reinforced vinyl chloride resin (FRV) among glass fiber reinforced thermoplastic resins. FRV has excellent chemical resistance,
It has good durability against corrosive liquids such as seawater, and because it has glass fibers in both sides, it is impact-resistant and hard to break.It has excellent properties such as not worrying about cracking even in low-temperature environments. Furthermore, it has excellent workability as it has flexibility and can be easily bent. Glass fiber reinforced thermosetting resin (FRP) plates can also be used as the cover plate 8, auxiliary cover plate 8, and connection cover plate 12, but as shown in the following table,
The strength of FRP is not much different from that of FRV, and
FRP has a higher specific gravity than FRV, is heavier, and has poor workability. FRP is virtually impossible to perform secondary processing, and cutting, etc. cannot be performed on site, and in particular, bending cannot be performed. The cover plate 5 and the auxiliary cover plate 8 have various drawbacks, such as being unable to bend to follow the curved surface of the steel pipe 1 and not being able to be accurately attached to the steel pipe 1 depending on the site situation. , it is preferable to use FRV as the connecting cover plate 12.

【table】

[Table] And the cover plate 5 is attached to the FRV as shown in Fig. 3.
A fixing piece 18 made of an FRV angle with an L-shaped cross section is attached to one side end of the plate 17, and a connecting piece 7 made of an FRV angle with an L-shaped cross section is attached to the other side end of the FRV plate 17. It is formed by When fixing the coupling piece 7 and the fixing piece 18 to the FRV board 17, heat tape 20 formed by sandwiching a heating wire between FRV films is attached to the FRV plate 17 and the fixing piece 18.
and the fixing piece 18 and melting the heat tape 20 by applying electricity to the heating wire, and the melting of the heat tape 20 fuses the coupling piece 7 and the fixing piece 18 to the FRV board 17. It can be done by Further, coupling holes 21 and attachment holes 6 are provided in the vertical pieces of the coupling piece 7 and the fixing piece 18 at predetermined regular intervals above and below, and the attachment holes 6 are formed as elongated holes that are elongated in the horizontal direction. Further, the width of the auxiliary cover plate 8 is narrower than that of the cover plate 5, as shown in FIG.
A fixing piece 22 formed of an FRV angle with an L-shaped cross section is attached to one side end of the FRV plate 17.
It is formed by attaching a connecting piece 10 formed of an FRV angle having an L-shaped cross section to the other side end of the FRV plate 17. and auxiliary cover plate 8
An overlapping piece 29 is formed by extending the FRV plate 17 outward from the connecting piece 7. Even in this case, the connecting piece 10 for the FRV plate 17
The fastening of the fixing piece 22 can be carried out in the same manner as described above. The vertical pieces of the coupling piece 10 and the fixing piece 22 are provided with coupling holes 23 and attachment holes 9 at predetermined intervals above and below, and the attachment holes 9 are formed as elongated holes extending in the horizontal direction. Furthermore, the connecting cover plate 12
As shown in FIG. 5, connecting holes 11 are formed at both ends of an FRV plate 17 at predetermined intervals vertically. Therefore, when carrying out the corrosion protection construction of the steel pipe sheet pile A that is already installed for the revetment of the quay wall 30 using the cover plate 5, the auxiliary cover plate 8, and the connecting cover plate 12 formed as described above, First, steel pipe sheet pile A
Remove foreign substances such as marine organisms and rust from the surface using a scraper or hammer. Next, a fixture 4 having bolts 3 protruding from each connecting piece 2 of the steel pipe sheet pile A is fixed to the outer surface side. As shown in FIG. 7, this mounting tool 4 is made by welding and fixing metal nuts 25 to the surface of a vertically elongated metal flat bar 24 at the same vertical spacing as the mounting holes 6 and 9 and the connecting hole 11, and also using a resin such as FRP. The bolts 3 formed in the above are screwed into the nuts 25, and welding holes 26 are bored in the upper and lower parts of each bolt 3. By inserting bolts 3, a pair of fixtures 4, 4 are attached to both sides of the rear surface of the connecting cover plate 12.
In this state, bring the fittings 4, 4 together with the connecting cover plate 12 between the steel pipes 1, 1 of the steel pipe sheet pile A, and while positioning them with the connecting cover plate 12, place the fittings The upper and lower ends of 4 are temporarily welded to the connecting piece 2, and after removing the connecting cover plate 12, the inner peripheral edge of the welding hole 26 is welded to attach the fitting to the connecting piece 2. 4 is fixed. After fixing the fixture 4 to each connecting piece 2 in this manner, a corrosion-resistant material 14 such as putty is applied from the outer surface of the connecting piece 2 of the steel pipe sheet pile A to the outer surface of the steel pipe 1 outside the connecting piece 2. As this corrosion-resistant material 14, it is preferable to use a material whose main component is petrolatum. Petrolatum is a type of petrolatum separated from crude oil by vacuum distillation, and is a white or brown translucent jelly-like substance whose main components are paraffinic and olefinic hydrocarbons with 16 to 32 carbon atoms. Yes, specific gravity is 0.85-0.88, melting point is 40°C
Before and after. Petrolatum has the property of not evaporating or hardening semi-permanently, and when applied to the surface of metal, it forms a semi-permanent corrosion-resistant layer that maintains viscosity at all times. By completely blocking the steel pipe sheet pile A from seawater and oxygen in the air with this anti-corrosion layer, the physical causes of corrosion can be completely eliminated. The anticorrosive material 14 is then formed by adding a rust inhibitor, tannin, inert silica, etc. to this petrolatum and solidifying it into a putty, or by impregnating it into a nonwoven fabric and making it into a sheet or tape. The tannin is a mixture of phenolic compounds, and when it comes into contact with iron, it forms a hard, dense film called iron tannate on the surface of the iron, which has the property of inhibiting the progress of rust. After applying the anti-corrosion material 14 as described above, the bolts and nuts 15 that connect the cover plate 5 and the auxiliary cover plate 8 through the coupling holes 21 and 23 of the respective coupling pieces 7 and 10 are loosely tightened. Therefore, the connecting pieces 7 and 10 are temporarily connected with a gap between them, and the cover plate 5 and the auxiliary cover plate 8 are connected.
are arranged on the outer surface side of the steel pipe 1, and the mounting holes 6 provided in the fixed piece 18 of the cover plate 5 and the mounting holes 9 provided in the fixed piece 22 of the auxiliary cover plate 8 are connected to the connecting pieces 2 on both sides of the steel pipe 1, Pass it through the bolt 3 of the fixtures 4 and 4 of No. 2. Similarly, other steel pipes 1 are covered with cover plates 5 and auxiliary cover plates 8.
be arranged. At this time, the overlapping piece 29 of the auxiliary cover plate 8 is overlaid on the back side of the cover plate 5. After that, the connecting cover plate 12 is arranged between the adjacent steel pipes 1, 1, and the connecting holes 11, 11 on both sides of the connecting cover plate 12 are connected to the fixing pieces 18 of the cover plate 5 and the fixing pieces 22 of the auxiliary cover plate 8, respectively. Pass it through bolts 3 and 3 from the outside. Furthermore, a plurality of upper and lower through holes 27 are bored at the same intervals as the bolts 3 of the fixture 4, and a spacer plate 28 formed of an FRV board as shown in FIG. The bolts 3 are placed on the outside through holes 27, and nuts 13 made of a resin material such as FRV are screwed onto each bolt 3 from the outside. By tightening the nuts 13, the cover plate for the fixture 4 is installed. 5. Fix the auxiliary cover plate 8 and the connecting cover plate 12. After fixing to the fixture 4 in this way, tighten the bolts and nuts 15 that have been loosely screwed together through the coupling holes 21 and 23 of the coupling pieces 7 and 10 of the cover plate 5 and the auxiliary cover plate 8, The cover plate 5 and the auxiliary cover plate 8 are coupled via the coupling pieces 7 and 10. Bolt nuts 15 like this
When tightening the bolts and nuts 1, the connecting pieces 7 and 10
5, the cover plate 5 and the auxiliary cover plate 8 are pulled together, and as a result, a tensile force acts on the cover plate 5 and the auxiliary cover plate 8, causing the cover plate 5 and the auxiliary cover plate 8 to bend along the curved surface of the steel pipe 1. At the same time, the cover plate 5 and the auxiliary cover plate 8 come into close contact with the corrosion-resistant material 14. In addition, when each steel pipe sheet pile A is connected by engagement by the engaging parts 16, 16 of the connecting pieces 2, 2, adjacent steel pipe sheet piles A As a result, the distance between the steel pipes 1 and 1 is not constant, and in the fixture 4 that is attached to the connecting piece 2 while being positioned by the connecting cover plate 12, the connecting pieces 2, 1 on both sides of the steel pipe sheet pile A, a mounting fixture 4 attached to 2;
This means that the distance between the four spaces will not be constant. Therefore, in this case, an error will occur in the mounting positions of the cover plate 5 and the auxiliary cover plate 8 with respect to the fixture 4. Therefore, the mounting holes 6 and 9 of the fixing pieces 18 and 22 of the cover plate 5 and the auxiliary cover plate 8 are formed as horizontally long elongated holes as described above, so that the mounting holes 6 and 9 of the fixing pieces 18 and 22 of the cover plate 5 and the auxiliary cover plate 8 are formed as long holes in the horizontal direction. This is absorbed by the mounting holes 6 and 9, which are elongated holes, so that there is no problem in mounting the cover plate 5 and the auxiliary cover plate 8. After installing the cover plate 5, the auxiliary cover plate 8, and the connecting cover plate 12 in this way, waterproof putty is applied to the nuts 13 and bolt nuts 15 to waterproof these parts, and the cover plate 5 and the auxiliary cover are Waterproof putty is filled between the upper and lower edges of the plate 8 and the connecting cover plate 12 and the outer surface of the steel pipe 1 to prevent seawater from entering from these areas, and finishing is performed. In this case, the outer surface of the steel pipe sheet pile A is covered with a corrosion-resistant material 14 to prevent corrosion.
protected by water and prevented from being washed away by seawater. [Effects of the invention] As described above, in the present invention, since the corrosion-resistant material is filled between the steel pipes and the connecting piece and the cover plate, the auxiliary cover plate, and the connecting cover plate, the outer surface of the steel pipe sheet pile is Corrosion can be prevented by the corrosion-resistant material, and the cover plate, auxiliary cover plate, and connecting cover plate can prevent the corrosion-resistant material from being washed away by seawater. In addition, when attaching the cover plate, auxiliary cover plate, and connecting cover plate to the steel pipe sheet pile, fix the mounting fixtures with multiple upper and lower bolts protruding from the outer surface of each connecting piece that protrudes from both sides of the steel pipe. and drilling a mounting hole in one end of the cover plate and drilling a mounting hole in one end of the auxiliary cover plate,
This cover plate and the auxiliary cover plate are arranged on the outer surface of the steel pipe between the connecting pieces on both sides of the steel pipe, and the mounting holes of the cover plate and the mounting holes of the auxiliary cover plate are connected to the fittings attached to each connecting piece. A connecting cover plate with connecting holes drilled through the bolts at both ends was placed between adjacent steel pipes, the connecting holes were passed through the bolts, and nuts were screwed onto the bolts. It is possible to install the cover plate, auxiliary cover plate, and connecting cover plate by simply attaching the fitting to the connecting tool of the steel pipe sheet pile without the need to perform any special processing on the steel pipe sheet pile. Moreover, two plates, a cover plate and an auxiliary cover plate, were used as plates to cover the steel pipe portion of the steel pipe sheet pile, and connecting pieces were attached to the outer surfaces of the ends of each of the cover plate and the auxiliary cover plate, and the connecting pieces were passed through both of the connecting pieces. Since the cover plate and the auxiliary cover plate are connected by connecting both connecting pieces with bolts and nuts, tension is applied to the cover plate and the auxiliary cover plate by tightening the bolts and nuts, and the cover plate and the auxiliary cover plate are tightened. The cover plates and auxiliary cover plates can be accurately attached to the steel pipes of the steel pipe sheet piles.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention;
Fig. 2 is a plan sectional view of the same as above, Fig. 3 a and b are a front view and plan sectional view of the cover plate used in the above, Fig. 4 a,
Fig. 5 is a front view of a connecting cover plate used in the above, Fig. 6 is a front view of a spacer plate used in the same, and Fig. 7 a and b are a front view of the auxiliary cover plate used in the same. FIG. 2 is a front view and an enlarged plan view of a fixture used in the same as above. 1 is a steel pipe, 2 is a connecting piece, 3 is a bolt, 4 is a fitting, 5 is a cover plate, 6 is a mounting hole, 7 is a connecting piece, 8
is an auxiliary cover plate, 9 is a mounting hole, 10 is a connecting piece, 1
1 is a connecting hole, 12 is a connecting cover plate, 13 is a nut, 14 is a corrosion-resistant material, and 15 is a bolt/nut.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A large number of steel pipes are connected from side to side by connecting the connecting pieces protruding from both side surfaces of the steel pipes, and a plurality of bolts are provided above and below protruding from the outer surface of each connecting piece. Fix the mounting bracket, drill a mounting hole in one end of the cover plate, and attach a coupling piece to the surface side of the other end, drill a mounting hole in one end of the auxiliary cover plate, and then drill a mounting hole in the other end. Attach the connecting piece to the end surface side,
The cover plate and the auxiliary cover plate are arranged on the outer surface of the steel pipe between the connecting pieces on both sides of the steel pipe with the connecting pieces of the cover plate and the auxiliary cover plate facing each other, and the attachment hole of the cover plate and the auxiliary cover Pass the mounting holes of the plates through the bolts of the fixtures attached to each connecting piece, place a connecting cover plate with connecting holes drilled at both ends between adjacent steel pipes, and pass the connecting holes through the bolts. , At the same time as screwing nuts onto the bolts, the bolts and nuts passed through both the connecting pieces of the cover plate and the auxiliary cover plate are used to connect both connecting pieces, and the steel pipe and the connecting piece are connected to the cover plate, the auxiliary cover plate, and the connecting cover plate. A corrosion-resistant structure of steel pipe sheet piles with a corrosion-resistant material filled between them. (2) The corrosion-resistant steel pipe sheet pile structure according to claim 1, wherein the cover plate, the auxiliary cover plate, and the connecting cover plate are each made of glass fiber-reinforced thermoplastic resin. (3) The corrosion-resistant structure of steel pipe sheet piles according to claim 2, wherein the glass fiber-reinforced thermoplastic resin is a glass fiber-reinforced vinyl chloride resin. (4) The corrosion-resistant structure of steel pipe sheet piles according to any one of claims 1 to 3 of the utility model registration claim, wherein the main component of the corrosion-resistant material is petrolatum.