JP2944858B2 - Structures with excellent corrosion resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure requiring corrosion resistance, such as an offshore structure such as an offshore pier or an offshore rig.

[0002]

2. Description of the Related Art In a marine structure, particularly a marine steel structure, in a portion where the wet and dry conditions are repeated due to the waves and tides,
Corrosion is severe.

In view of the above, anticorrosion treatment such as painting and coating has been conventionally performed on a portion having a high corrosiveness, but at present, it cannot sufficiently cope with aging.

[0004] As a countermeasure, Japanese Patent Laid-Open Publication No. Sho 62-44948 discloses that a splash zone of seawater is surrounded by a titanium plate as a material having excellent corrosion resistance.
In this case, if the titanium plate and the steel material as the structure base material are fixed by welding, a brittle intermetallic compound is formed, and there is a problem that the titanium plate cannot be reliably coated on the steel structure base material.

Therefore, Japanese Patent Application Laid-Open No. 4-182522 discloses that
It has been proposed to surround the entire seawater splash zone of the structural substrate with a titanium clad steel plate. In this offshore structure, at the uppermost stage and the lowermost stage, titanium clad steel plates are arranged horizontally adjacent to each other in the longitudinal direction, the base materials of the titanium clad metal plates are joined together, and the gaps between the titanium laminated materials are formed. Is bonded and coated on the titanium bonding material by crosslinking the titanium plate, and the voids of the titanium bonding material at the uppermost and lowermost continuous end faces are hermetically covered with an Ag-Cu-based welding metal. .

[0006]

However, in this marine structure, when the gaps of the titanium bonding material at the uppermost and lowermost continuous end faces are hermetically covered by brazing with an Ag-Cu-based welding metal, The strength of the deposited metal is low,
There is a significant problem in terms of durability, such as gaps and cracks due to thermal stress caused by the temperature environment of the structure. Moreover,
The cost of the deposited metal material is high and the utility is poor.

Accordingly, a main object of the present invention is to fill the gaps of the titanium bonding material and / or the gaps of the base material at the upper and lower end surfaces formed when the uppermost and lowermost titanium clad metal plates are connected in series with the weld metal. Without sealing
An object of the present invention is to improve the corrosion resistance of the entire structure by sealing with a covering material.

[0008]

The gist of the present invention which has solved the above problems is as follows. (1st invention) In a structure in which a titanium clad metal plate is vertically and horizontally connected and surrounded around a site requiring corrosion resistance of a structure substrate,
The base material of the adjacent titanium clad metal plates at the uppermost stage and the lowermost stage are joined together, and the titanium plate is cross-linked to the gap between the titanium laminated materials to bond and coat the titanium laminated material. together closed by material closing the gap portion of the titanium alignment material in the continuous設端surface of, its
Seam between the sealing material and the titanium clad metal plate and
At the seam between the plugging material and the titanium plate,
Brazing with weld metal for joints or joints
The seam or seam between homogeneous parts is welded.
A structure having excellent corrosion resistance, wherein the structure is joined to seal the gap . (Second invention) In a structure in which a titanium clad metal plate is vertically and horizontally connected and surrounded around a site requiring corrosion resistance of a structure substrate,
Adjacent titanium clad gold at top and bottom
In the metal plate, the titanium laminated materials are joined together while the mother
The materials are spaced apart from each other, and the gaps of the base material on the end faces of the uppermost row and the lowermost row are closed with the plugging material,
Seam and blockage between the cladding material and the titanium clad metal plate
Seam between different members at the seam between the material and the titanium plate
Or the joint is brazed by welding metal.
Welded joints or joints between homogeneous parts
And a structure having excellent corrosion resistance, characterized in that the gap is sealed . (Third invention) In a structure in which a titanium clad metal plate is vertically and horizontally connected and surrounded around a site requiring corrosion resistance of a structure base material,
Titanium-clad metal plates are spaced apart at the top and bottom, and the gaps between adjacent titanium-clad metal plates are joined and coated on the titanium laminate by bridging the titanium plate, and the top and bottom adjacent The gap between the base material and the gap between the titanium cladding material at the continuous end face of the titanium clad metal plate to be closed with the plugging material, and the plugging material
The joint with the titanium clad metal plate and the plugging material and the front
In the seam with the titanium plate, the seam between different members or
The joint is brazed with weld metal,
The joints between the materials are joined by welding.
A structure excellent in corrosion resistance, characterized in that the gap is sealed .

[0009]

In a structure in which a titanium clad metal plate is arranged vertically and horizontally around a portion requiring corrosion resistance of a structural base material, when a titanium clad metal plate is continuously arranged at an uppermost stage and a lowermost stage, titanium is used. It is not possible to weld the base metals of the clad metal plates and the titanium composite material in common due to the difference in the clad materials.

Therefore, in the first invention, the adjacent side of the titanium cladding material of the adjacent titanium clad metal plate is removed, and the base materials are butt-joined. However, since there is a gap between the titanium laminates, the gap is bonded to the titanium laminate by bridging the titanium plate to prevent corrosion of the base material due to seawater intrusion.
In addition, seawater also invades from the gaps of the titanium laminated material at the uppermost and lowermost continuous end faces. Therefore, by sealing the gap of the titanium composite material with a plugging material,
Seawater intrusion can be prevented.

On the other hand, according to the second aspect of the present invention, the base materials of the adjacent titanium clad metal plates can be separated from each other to join the titanium laminated materials together. In this case, since the seawater enters from the gaps of the base material at the uppermost and lowermost continuous end faces, the gaps are sealed with a blocking material.

Further, according to the third invention, the titanium clad metal plates can be arranged separately at the uppermost stage and the lowermost stage. In this case, the intrusion of seawater into the gap between the adjacent titanium clad metal plates can be prevented by crosslinking the titanium plate and bonding and covering the titanium laminated material. In addition, the gaps of the base material and the gaps of the titanium composite material at the continuous end faces of the adjacent titanium clad metal plates at the uppermost stage and the lowermost stage are sealed with a common closing material, so that seawater can be prevented from entering.

In the present invention, the titanium composite material of the titanium clad metal plate is a titanium material such as pure titanium or a titanium alloy which is more excellent in corrosion resistance than the structural substrate. Also,
The base material of the titanium clad metal plate is not particularly specified, but is preferably a material that can be welded to the structural base material.
When the structural substrate is steel, titanium-clad steel is desirable as the titanium-clad metal plate.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. (First Invention Example) FIGS. 1 to 7 show a first invention example. FIG.
As marine steel structures as structural substrate 1, an example which attained corrosion of the pier assembled in prismatic, with respect to site of the corrosion resistance of the structure substrate 1 is required, the base material the piece of titanium clad steel plate M and titanium case I was member C, and shows a state that is fixedly welded. In this example, for each surface, upper pieces 10, 11 made of titanium clad steel plate are horizontally arranged at the uppermost stage,
Similarly, the lower pieces 12, 13 of the titanium clad steel sheet are arranged adjacently at the lowermost stage. These upper pieces 1
Between the 0, 11 and the lower pieces 12, 13, three intermediate pieces 14, 15, 16 of titanium clad steel plate are arranged adjacent to each other in a vertical state at a slight distance from them. Each of these pieces can fix the base material M to the structure base material 1 by the fillet arc weld 2 to the structure base material 1 as typically shown in FIG. .

On the other hand, at least between the upper pieces 10 and 11 adjacent to each other at the uppermost stage and the lowermost stage and between the lower pieces 12 and 13, the base materials M and M are butt-joined to each other by the arc welding portion 2. is there. In order to perform this butt arc welding from the front side, a titanium bonding material C
A piece having a cut-off portion that does not reach the side where the butting ends of the pieces are used.

Hereinafter, since the lowermost stage has the same structure as the uppermost stage, the structure of the uppermost stage will be mainly described as an example. Since the portion S is generated, the missing portion S
Is cross-linked to the titanium laminates C, C by cross-linking the titanium plate 20 to prevent corrosion of the base material due to seawater intrusion. Titanium plate 20 of titanium alignment material C, and when the pairs to <br/> bonded to C, TIG weld 4 on both sides of the titanium plate 20
Can be performed.

Furthermore, from the gap portion S _E of titanium alignment material in the continuous設端surface of the uppermost and lowermost, a seawater intrusion. Therefore, material closing the gap portion S _E of titanium alignment material, for example by sealing with closing member consisting of a titanium closing member 21 or a titanium clad metal plate titanium alignment member C and the homogeneous member can prevent seawater from entering. Closing material 2
1 is a titanium sealing material 21, the sealing material 21 is fixed between the lower edge of the front surface of the sealing material 21 and the titanium plate 20, the lower edge of the end surface of the sealing material 21 and the titanium plate 20 and the titanium bonding material C. Is between the upper edge of the rear surface of the plug 21 and the structure 1 by TIG welding, and the lower edge of the end surface of the plug 21 and the base metal M.
Can be performed by brazing with an Ag-Cu-based or V-based weld metal.

Further, as shown in FIGS. 6 and 7, a similar structure is employed in a corner portion between one surface of the structural substrate 1 and another adjacent surface. 20A is a corner portion titanium plate, and 21A is a corner portion closing material. In this case, as shown in FIG. 7, the upper ends of the corner portion titanium plate 20A and the corner portion closing material 21A are the same, and the mating surfaces are TIG welded.

On the other hand, the intermediate pieces 14, 15, 16 and between them and the upper pieces 10, 11 and the lower pieces 12, 13 are also covered with the titanium plate 20, and as a whole,
As shown in FIG. 2, the missing portion S of each piece is
And covered with a corner portion of titanium plate 20A, closing member 21 each gap portion S _E, is sealed in the corner portion closing member 21A.

(Second Embodiment) FIGS. 8 to 14 show a second embodiment of the present invention, in which upper pieces 10, 11, lower pieces 12, 13 and intermediate pieces 14, 15, 16 shown in FIG. Is similar to that of FIG.

Taking the uppermost stage as an example, FIGS.
As shown in FIG. 1, unlike the first invention example, the titanium clad material C of the titanium clad metal plate protrudes from the end face of the base material M, and the base material M of the upper pieces 10 and 11 has a gap S between the base materials M and M. Is covered by the extending portion of the titanium bonding material C, C,
The end surfaces of the titanium laminated materials C are butted from the front and TIG-welded. However, upper piece 10,
11 base material M in the continuous設端surface of the gap portion S _E as the exposed portion of the missing part S of M, are preferably sealed with a closing member 30 of the base material M and homogeneous member. When fixing the plugging material 30, in the case of the titanium plugging material 30, the titanium plugging material and the base material M of the structure base material 1 and the upper pieces 10, 11
For M, the sealing material 30 and the upper pieces 10 and 11 are joined together by brazing with an Ag-Cu or V-based welding metal.
Can be carried out in TIG welding for between I was member C, C.

[0022] Similarly, as shown in FIGS. 12 and 13, at the corner portion, to seal the gap portion S _E by the corner portion closing member 30A.

As in the first embodiment of the present invention, fillet arc welding cannot be performed on the structural substrate 1 between the upper pieces 10 and 11 from the front. Therefore, when the size of the upper pieces 10, 11 is large, other fixing means are also required. Also, in particular, the intermediate piece 14
For Nos. To 16, fixing to the structure substrate 1 cannot be performed by arc welding. Therefore, as illustrated in FIG. 8, the screw 5 can be screwed into the structure substrate 1 through the piece from the surface and fixed. At this time, in order to prevent seawater from entering from the head of the screw 5, the head of the screw 5 is sealed with an Ag-Cu-based welding metal 6 or a V-based welding metal, or as shown in FIG. As shown, the periphery of the screw 5 is covered with a disc 7 and the periphery thereof is covered with a TIG weld 8
Can be sealed.

[0024] In the (third invention example) the first and second invention examples, and shows an example of welded butt one of the matrix or titanium alignment material titanium clad metal plate, a titanium clad metal plate They may be spaced apart. That is, as shown in FIG. 15 and FIG. 6, the upper pieces 10 and 11 are spaced apart, and the base materials M and M are fillet arc welded to the structure base material 1. Upper piece 1
Since the missing portions S are formed between the base materials M, M of 0 and 11 and the titanium bonding materials C, C, the missing portions S are formed on the titanium bonding materials C, C by crosslinking the titanium plate 20. Bonding coating prevents base material corrosion due to seawater intrusion.
Titanium plate 20 Titanium alignment material C, when joining by pairs C performs both sides of the titanium plate 20 by TIG welding unit 4.

Furthermore, titanium alignment material C, C and matrix M, from the gap portion S _E M is missing, there is seawater intrusion. Therefore, sealed by closing member 40 of the gap portion S _E.

The plugging material 40 may be a titanium plugging material made of the same material as the titanium bonding materials C, C, or may be a titanium clad metal plate plugging material comprising a plugging base material 40a and a plugging titanium bonding material 40b. In this case, the closing base material 40a and the base materials M, M of the upper pieces 10, 11 and the connection between the closing base material 40a and the structure 1 are arc welded, and the closing titanium bonding material 40 is joined.
b and the titanium plate 20 and the closing titanium bonding material 40b and the titanium bonding materials C and C of the upper pieces 10 and 11 are joined by T
It can be performed by IG welding, and brazing welding only needs to be performed between the arc weld and the TIG weld.

Similarly, the corner portion can be sealed by the corner portion closing material 40A. A description will be given of a mode of fixing the corner closing material 40A which is basically similar to the above closing material 40. The closing base material 40a of the corner closing material 40A is attached to the structure base material 1 and the base material M of the upper piece 11. Fillet arc welding is performed, and TIG welding is performed between the closing titanium bonding material 40b and the corner portion titanium plate 20A. Further, since the boundary between the closing base material 40a and the closing titanium bonding material 40b cannot be sealed by welding, this boundary is made of Ag-Cu-based welding metal or V-based welding metal. Sealed by brazing weld 9.

[0028]

As described above, according to the present invention, according to the present invention, the void portions of the gap portion and / or the base material of the titanium alignment material in the upper and lower end surfaces occurring upon continuously provided the uppermost and lowermost titanium clad metal plate Can be sealed. In particular, in the present invention, the sealing material is sealed with a sealing material as a member without using a welding metal as a sealing material. Thereby, a structure having excellent durability such as no gap or crack is generated. In addition, since the plugging material is made of the same material as the base material of the titanium clad metal plate or the titanium bonding material, it is not necessary to use expensive welding metal as in the conventional example. There is also an advantage that the material cost of the device is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a titanium clad metal plate is fixed to a structural substrate according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a state where sealing of a missing portion and a gap portion is completed.

FIG. 3 is a perspective view for explaining a sealing mode of a missing portion and a gap portion.

FIG. 4 is a plan view showing a state before completion of sealing of the gap.

FIG. 5 is a vertical cross-sectional view showing a completed sealing state.

FIG. 6 is a plan view showing a state before completion of sealing of a void portion in a corner portion.

FIG. 7 is a perspective view after completion of sealing at a corner portion.

FIG. 8 is a perspective view showing a state where sealing is completed in the second invention example.

FIG. 9 is a plan view showing a state before completion of sealing of the gap.

FIG. 10 is a plan view showing a completely sealed state.

FIG. 11 is a perspective view thereof.

FIG. 12 is a plan view showing a state before completion of sealing of a void portion in a corner portion.

FIG. 13 is a plan view of the corner portion after sealing is completed.

FIG. 14 is a sectional view of an example of fixing a piece.

FIG. 15 is a plan view showing a state before completion of sealing of a void portion in the third invention example.

FIG. 16 is a perspective view for explaining a sealing mode of a missing portion and a gap portion.

FIG. 17 is a perspective view showing a state after sealing a gap portion in a corner portion.

FIG. 18 is a plan view thereof.

FIG. 19 is a view taken in the direction of the arrows 19-19.

FIG. 20 is a view taken along line 20-20.

FIG. 21 is a view taken along line 21-21.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Structural base material, 2 ... Arc welding part, 4 ... TIG welding part, 9 ... Brazing welding part, 10, 11 ... Upper piece, 1
2, 13 ... lower piece, 14-16 ... middle piece, 20 ...
Titanium plate, 20A: Corner titanium plate, 30: Titanium plate, 30A: Corner titanium plate, 40: Titanium plate, 4
0A ... corner of titanium plate, S ... missing part, S _E ... gap portion, M ... base material, C ... titanium if I was material.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shuichi Hara 4-5-33 Kitahama, Chuo-ku, Osaka City Inside Sumitomo Metal Industries, Ltd. (72) Inventor Akira Minase 10-29 Kawaharacho, Joetsu City, Niigata Japan Nippon Stainless (56) References JP-A-4-182522 (JP, A) JP-A-2-52176 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 31 / 06

Claims (3)

(57) [Claims] 1. A structure in which a titanium clad metal plate is vertically and horizontally connected and surrounded around a site requiring corrosion resistance of a structural base material, wherein a base material of an adjacent titanium clad metal plate at an uppermost stage and a lowermost stage is provided. At the same time , the titanium plate is cross-linked to the gaps between the titanium bonding materials, and the titanium bonding material is bonded and coated, and the gaps between the titanium bonding materials on the end surfaces of the uppermost stage and the lowermost stage are filled with the sealing material. When closing, the closing material and the
Seam with tank clad metal plate, plugging material and said titanium
Seam or seam between dissimilar members at the seam
For brazing with weld metal,
Seams or joints are welded together and
A structure excellent in corrosion resistance characterized by sealing the gap . 2. A structure in which a titanium clad metal plate is vertically and horizontally connected and surrounded around a portion of a structural base material requiring corrosion resistance, and a titanium clad metal plate adjacent to the titanium clad metal plate at the uppermost and lowermost stages.
In the metal plate, the titanium laminated materials are joined together while the mother
The materials are spaced apart from each other, and the gaps of the base material at the upper end and the lower end of the continuous end face are closed with a plugging material, and the plugging material and the titanium cladding are used.
Seam between the metal plate and the sealing material and the titanium plate
About joints or joints between different members in eyes
Is brazing with welded metal,
A structure excellent in corrosion resistance, characterized in that the seam portion is joined by welding to seal the gap . 3. A structure in which a titanium clad metal plate is vertically and horizontally connected and surrounded around a site requiring corrosion resistance of a structure base material, wherein the titanium clad metal plate is spaced apart at an uppermost stage and a lowermost stage. The gap between the adjacent titanium clad metal plates is bonded and coated on the titanium bonding material by bridging the titanium plate with the gap between the adjacent titanium clad metal plates, and the gap of the base material at the continuous end face of the uppermost and lowermost adjacent titanium clad metal plates And a gap between the titanium bonding material and the sealing material.
Seam with clad metal plate and sealing material and the titanium
Seam or seam between foreign members at seam with plate
Is welded by brazing with weld metal to
The joints or seams are welded together and the gap
A structure with excellent corrosion resistance, characterized in that the part is sealed .