JP2958243B2 - Metal coating method for steel pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, for example upon coating the coating metal such as corrosion-resistant metal steel pipe, such as a synthetic resin or mortar such between the steel surface and improving the impact resistance for the purpose and the coating metal The present invention relates to a metal coating method for injecting a curable filler, and is used for construction of civil engineering and architectural structures such as bridges, marine structures, pipelines and underground structures.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 2-256713 discloses that a steel pipe pile is subjected to a coating base treatment on the outer surface thereof, and an urethane elastomer or an adhesive resin such as polyethylene, nylon or vinylon is coated on the outer surface by a thickness of 2 mm. A multi-layer coated steel pipe pile in which a corrosion-resistant metal sheet such as a stainless steel foil or the like which has been coated to a certain extent and further subjected to embossing is wound thereon is disclosed.
In the multi-layer coated steel pipe pile, each of the coated adhesive resin and the embossed corrosion-resistant thin metal plate has a function of improving the corrosion prevention performance and impact resistance of the coated steel pipe pile. Japanese Patent Application Laid-Open No. 5-132966 discloses a corrosion-resistant triple pipe in which a concrete-filled layer is provided between a steel pipe as an inner pipe and an outer pipe made of a corrosion-resistant metal such as stainless steel or titanium surrounding the steel pipe, and a method of manufacturing the same. Is disclosed.

[0003]

The above-mentioned JP-A-2-256
In the case of the multi-layer coated steel pipe pile described in Japanese Patent Application Laid-Open No. 713, it is considered that a spacing material is not necessary because the resin itself has a spacing function. However, in the manufacture thereof, in addition to the undercoating treatment for coating, it is necessary to perform an operation of uniformly applying the resin to a thickness of about 2 mm (or more), which is troublesome, and requires additional work. There is no guarantee that the layer of corrosion resistant sheet metal to be wound will be formed uniformly. Also,
There is a statement that the corrosion-resistant metal sheet is wound on the resin layer and the closed part is folded or tightened by caulking, but caulking work in a circular closed state is difficult,
There is a possibility that a gap may be formed between the resin layer and the resin layer, or the distance between the resin layer and the steel pipe pile may not be uniform.

[0004] On the other hand, in the case of the anticorrosion triple pipe described in the above-mentioned Japanese Patent Application Laid-Open No. 5-132966, a steel pipe which is excellent not only in anticorrosion performance but also in strength in some applications is used. However, when it is desired to reduce the thickness of the filling layer or the outer tube of the corrosion-resistant metal, there is a problem of concrete filling.
There is also a statement that spacers for keeping the thickness of the filling layer constant are appropriately arranged, but when the metal to be coated is thin, irregularities due to deformation of the coated metal occur at the spacer portion, which is not preferable in aesthetic appearance. . Further, when the coated metal is closed in a circular manner, the same problem as that of the multi-layer coated steel pipe pile described in JP-A-2-256713 described above occurs.

Accordingly, the present invention provides a metal coating method in which a layer of a hardening filler is provided between a steel pipe and a coating metal so that the hardening filler can be uniformly filled without causing an unfilled portion or an air pocket. Another object of the present invention is to provide a metal coating method that can be easily attached without causing deformation of the coated metal.

[0006]

Metallization process of the present invention SUMMARY OF], in order to achieve the above object, the coated metal is provided at a predetermined gap to the surface of the steel pipe, cured in the gap between the steel pipe and the coating metal In the metal coating method for a steel pipe in which a filler is injected, prior to providing a coating metal, a predetermined number of strip-shaped spacing members having a predetermined thickness corresponding to the gaps are attached to the surface of the steel pipe at a required number of intervals. The present invention is characterized in that a coating metal is provided on the spacing material and the curable filler is injected.

A steel plate having a curvature corresponding to the curvature of the steel pipe can be used as the strip-shaped spacing member. The coating metal is wrapped around the spacing material surface to form a circular closure. Circular closure, conventional infinity joint, slip joint,
There is no particular limitation, and there is no particular limitation on whether the joint portion is crimped or welded.

Further , the strip-shaped spacing member may be provided with a taper in accordance with the method of injecting the curable filler. In order to fill mainly in a narrow space, it is necessary to prevent an unfilled portion or an air pocket from being generated. In addition to the selection of the material of the curable filler, it is also useful to provide the space holding material with a taper like this. . As the injection direction, by filling the hardening filler with relatively high fluidity from below by applying pressure, it is easy to suppress the occurrence of unfilled portions and air pockets, but the injection direction is from the bottom. The present invention is not limited to this, and can be selected as appropriate, such as when viewed from above, when viewed from the side, and when viewed from a plurality of locations.

[0009] Furthermore, or broken at the corner of the coated metal spacing holding member, to prevent wrinkles from entering, it is useful to chamfer the corners of the surface in contact with the coated metal of spacing material. This is particularly effective when the thickness of the coating metal is small.

[0010] Examples of the coating metal, primarily corrosion resistance metal is applied, as the scope of the present invention need not be limited to corrosion resistant metal. Examples of the corrosion-resistant metal include a foil or a thin plate of titanium, a titanium alloy, stainless steel, an aluminum alloy or the like, a galvanized steel sheet, a galvanized aluminum steel sheet, and the like. Also, the curable filler is
Synthetic resins that can be filled into gaps of several mm to several tens of mm (or more) or mortars with enhanced fluidity can be used, but applications (including cases where corrosion prevention is not the purpose). Depending on the type of coating metal,
The thickness and the type of the curable filler (organic or inorganic) can be selected.

[0011]

In the metal coating method of the present invention, the hardening filler can be filled to a uniform thickness over the entire surface of the steel pipe due to the presence of the strip-shaped spacing material. In particular, even when it is desired to reduce the thickness of the curable filler or when the coating metal is thin, it is easy to secure a uniform thickness. In addition, when the wound thin coated metal is circularly closed with a seam joint, slip joint or other joining method, unevenness may occur on the coated metal by joining at the position where it comes in contact with the strip-shaped spacing material. It is possible to join without making it.

According to the metal coating method of the present invention, without causing the unevenness of the coated metal, it can be filled with a curable filler to a uniform thickness. For the strip-shaped spacing material, by providing a taper in the curable filler injection direction,
The resistance to the injection pressure can be reduced, and the filling property can be improved.

[0013] Further, by chamfering the corners of the surface in contact with the coated metal of spacing material, in a case the coating metal is thin, Slight coated metal at the corners of spacing material,
Alternatively, wrinkling can be prevented.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, the dimensional relationship of each member in each figure, the magnification in the enlarged view, and the like do not always match. First, FIG. 1 schematically shows an embodiment of the metal coating method of the present invention. First, a plurality of strip-shaped spacing members (4) are attached to the surface of the steel pipe (1) at predetermined intervals in the longitudinal direction. In this embodiment, the spacing member (4) is divided into two parts in the circumferential direction and arranged at predetermined intervals. However, the number of divisions may be three or more, and it is necessary to arrange them on the same horizontal section. However, the staggered arrangement may be provided in the longitudinal direction. The means for attaching the spacing member (4) may be an adhesive or the like in addition to welding. Next, a thin plate of a titanium alloy or the like is wound around the spacing material (4) as the coating metal (2) and closed in a circular manner, and the steel pipe (1) and the coating metal (2) are closed.
And the curable filler (3) is injected. Due to the hardening of the curable filler (3), the surface of the steel pipe (1) is protected by the curable filler (3) and the coating metal (2) thereon, and the corrosion resistance and impact resistance are greatly improved.

FIG . 1 (b) shows an enlarged cross section taken along the line AA of FIG. 1 (a), that is, a cross section of the metal-coated steel pipe (1). Steel thickness t1
= 16 mm, the thickness t2 of the coated metal t2 = 0.5 mm, and the thickness t3 of the curable filler (3) = 5 mm. It should be noted that this numerical value is merely an example, and differs depending on the type, use, and the like of the steel pipe (1). FIG. 1 (c) is an enlarged sectional view taken along the line BB of FIG. 1 (a), that is, a longitudinal section of the metal-coated steel thickness (1a), and the thickness t3 'of the spacing member (4).
And the thickness t3 of the curable filler (3) is substantially equal to t
3 '= t3.

FIG . 2 shows a structure in which a taper portion (5) is provided in the spacing member (4), and the coating metal and the curable filler are omitted. FIG. 2A shows a case where the curable filler (3) is injected from below. When the injection pressure is applied from below, the curable filler (3) wraps around to the side along the tapered portion (5) of the spacing material (4), so that the lower portion of the spacing material (4) is not filled. It is possible to prevent the formation of air pockets or air pockets. Arrows in the figure indicate the injection direction and flow direction of the curable filler. FIG. 2B shows an example in which the injection direction of the curable filler (3) is up or down or any one of them. Tapered portions (5) are formed above and below the spacing material (4). .

FIG . 3 shows a shape of the chamfered spacing member (4). FIG. 3 shows a case where the spacing member (4) does not have a tapered portion, and a chamfered portion (6) extending over four turns is formed in the rectangular spacing member (4) when viewed from the front. Due to the chamfered portion (6), even if the interval between the spacing members (4) is large to some extent, the wound coated metal (2) may be broken or wrinkled at the corners of the spacing member (4). Is preventing.

FIG . 4 shows a shape in which the spacing material (4) has a tapered portion (5) in the direction of injection of the curable filler (3) and a chamfered portion (6) is formed in the peripheral portion. I have.

[0019]

According to the metal coating method for steel pipes disclosed in the present invention, the following effects can be obtained. (1) By attaching a strip-shaped spacing member to the steel pipe in advance, winding of the coated metal becomes easy, and the hardening filler can be filled to a uniform thickness over the entire surface of the steel pipe . Especially when it is desired to reduce the thickness of the curable filler or when the coating metal is thin, it is easy to secure a uniform thickness without unevenness, and the metal coating structure has good appearance and quality. Is obtained. (2) Even in the case of circularly closing the coated metal, by performing bonding at a position in contact with the strip-shaped spacing member, the coated metal can be securely bonded without causing unevenness. (3) By providing the spacing material with a taper in the injection direction of the curable filler, the resistance to the injection pressure can be reduced, and the filling property can be improved. (4) By chamfering the corners of the surface of the spacing material that comes into contact with the coating metal, it is possible to prevent the coating metal from breaking or wrinkling even when the coating metal is thin.

[Brief description of the drawings]

FIG. 1 schematically shows an embodiment of the metal coating method of the present invention. (A) is a perspective view, (b) is its AA
Line enlarged sectional view, (c) is an enlarged sectional view taken along line BB.

FIG. 2 shows an embodiment in which a tapered portion is provided in a spacing member, which is a constituent element of the present invention. (A) is a front view showing the tapered shape of the spacing material when the curable filler is injected from below, and (b) is the spacing when the curable filler is injected from above or below or one of them. Front view showing tapered shape of material

FIG. 3 shows an embodiment of the present invention in which the spacing member is chamfered. (A) is a front view in which a chamfered spacing member is attached to a steel pipe, and (b) is an enlarged cross-sectional view taken along the line DD.

FIG. 4 is a front view in which a taper portion is provided, and the spacing member of the present invention, which is chamfered, is attached to a steel pipe.

[Explanation of symbols]

 1Steel pipe  2 Coated metal 3 Curable filler 4 Spacing material 5 Tapered part 6 Chamfered part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-132966 (JP, A) JP 2-42972 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 31/06 E04B 1/64

Claims (3)

(57) [Claims] 1. A on the surface of the steel pipe with a predetermined gap provided coated metal, in the metal coating process of the steel pipe for injecting a curable filling material in the gap between the steel pipe and the coating metal, for providing the coated metal prior, the steel pipe in the longitudinal direction at the required number of required intervals <br/> zone plate of spacing material having a predetermined thickness, and curvature corresponding to the curvature of the steel pipe corresponding to the gap on the surface of the steel pipe
A metal coating method for a steel pipe , wherein the metal is provided in the circumferential direction, and then the coating metal is provided on the spacing material, and a hardening filler is injected. To wherein said band plate of spacing material, the filling
2. The metal coating method for a steel pipe according to claim 1 , wherein a taper is provided in a material injection direction . Wherein the strip-shaped spacing holding material is a metal coating process of the steel pipe according to claim 1 or 2, wherein are chamfered corner of the surface in contact with the coated metal.