JP5642816B2 - Edge painting method for metal structures - Google Patents

Description

  The present invention relates to an edge painting method in a metal structure.

  It has been pointed out that metal structures such as steel girders and guardrails of bridges are easily peeled off, and the portions where the paint is peeled are rusted and deteriorated when exposed to rainwater. This edge degradation can eventually spread throughout the metal structure.

  In particular, it is known that the coating is difficult to fix and easily peels off at the corner angle and the narrow end surface constituting the edge portion.

  In anticipation of peeling off of the above-mentioned coating, conventionally, a coating is thickly applied to the edge of the metal structure to ensure the coating thickness and prevent the coating from peeling off.

  Alternatively, the protruding corner angle of the edge is processed into a curved surface to ensure a desired coating thickness at the protruding corner angle, thereby preventing the paint from peeling off.

  However, in the case of thickly applying a paint as described above, a desired coating thickness cannot be obtained unless the process of applying the paint and the process of drying the applied paint are repeated a plurality of times. It has to be repeated, and there is a problem that the painting work becomes complicated and is prolonged.

  In addition, when the edge corner is curved as described above, the curved surface machining step is indispensable, which complicates and lengthens the painting work.

  The present invention provides a coating method capable of forming a strong and uniform coating layer on the edge of a metal structure in a short time.

In short, the coating method according to the present invention is such that the edge of a metal structure is covered with a fibrous material made of non- woven fabric, Japanese paper or Western paper, and has a structure in which fibers are intertwined irregularly , and the outer surface of the fibrous material The paint is applied to the fiber material and the fiber material is impregnated in the fiber material, and the composite material layer composed of the paint and the fiber material is formed by hardening the fiber material so that the fiber material is hardened. In addition, the composite paint layer made of the paint and the fiber material effectively prevents the paint from peeling off.

  The painting method according to the present invention is performed on the edge of a metal structure that requires weather resistance, such as a metal bridge girder or a metal guard rail.

  Preferably, the end portion of the fibrous material is covered with the paint, whereby the end portion of the fibrous material is sealed to form the composite coating layer rich in watertightness.

  More preferably, a channel-like fiber material having a U-shaped cross section is prepared, and the channel-like fiber material is externally fitted to the edge of the metal structure, so that the edge of the metal structure can be easily formed. Envelop.

  According to the present invention, a composite coating layer composed of a paint and a fiber material, that is, a composite coating layer that firmly and uniformly covers the edge can be formed at the edge of the metal structure. While effectively preventing peeling off, it is possible to appropriately protect the edge and prevent deterioration due to rain water or the like.

  In addition, a composite coating layer having a desired thickness can be formed in a short time, and the efficiency of the painting work can be improved.

(A) is a perspective view explaining the process of apply | coating an adhesive agent to the edge part of a bridge girder, (B) is an expanded sectional view of the edge part explaining the process. (A) is a perspective view explaining the process of covering the edge part of a bridge girder with a fibrous material, (B) is an expanded sectional view of the edge part explaining the process. (A) is a perspective view explaining the process of apply | coating a coating material on the outer surface of the fibrous material which covered the edge part of the bridge girder, (B) is an expanded sectional view of the edge part explaining the same process. (A) is an expanded sectional view which shows the state which covered the edge part of the fibrous material with the coating material, (B) is an expanded sectional view which shows the other example of the same state. Sectional drawing which shows the example which gave the coating method which concerns on this invention to the edge part of a guardrail, and formed the composite coating layer. (A) is a top view which shows the example which covers the volt | bolt and nut which are the edge parts of metal structures with a fibrous material, (B) is the sectional drawing.

  The best mode of the edge painting method in the metal structure according to the present invention will be described below with reference to FIGS.

  1 to 4 show an example in which a coating method according to the present invention is applied to an edge 2 of a bridge girder 1 which is a metal structure. In addition, 8 in FIG. 1 thru | or 3 has shown the concrete slab formed on the bridge girder 1. FIG.

  In FIG. 1 to FIG. 4, the H-shaped steel girder is described as the bridge girder 1 and both ends of the lower flange 1a of the H-shaped steel girder are described as the edge portions 2, but the painting method according to the present invention is limited to this. It is not excluded that it is performed on both ends of the upper flange of the same H-shaped steel beam, on both ends of the lower flange of the T-shaped steel beam, and on both ends of the upper and lower flanges of the I-shaped steel beam.

  As will be described later, it goes without saying that the coating method according to the present invention can be applied to the protruding end of the metal structure 1, that is, the bolt and nut as the edge 2.

  The coating method according to the present invention will be described step by step.

<Adhesive application process>
In the present invention, first, an adhesive 3 is applied to the edge 2 of the bridge beam 1 as shown in FIGS. The application process of the adhesive 3 may be any of application by brush or roller, spray application such as spraying, and the application is performed continuously or intermittently in the longitudinal direction (bridge length direction) of the edge 2.

  When the bridge girder 1 is newly installed, the adhesive 3 is applied to the surface of the plating applied to the bridge girder 1. In the case where the bridge girder 1 is already installed, the adhesive 3 is applied after removing paint and floating rust.

  As the adhesive 3, an adhesive mainly composed of a solventless urethane silicon resin, urethane silicon epoxy resin, acrylic urethane silicon resin, acrylic resin, urethane resin, or acrylic urethane resin is used. Preferably, the inner and rear surfaces 4b of the fibrous material 4 to be described later are impregnated using a two-component curable adhesive that hardens in a short time, and the fibrous material 4 is adhered to the edge portion 2.

  The adhesive 3 has a viscosity of 4000 mpa · s (under 23 ° C.) or less, preferably 100 to 1000 mpa · s (under 23 ° C.), and penetrates into the fibrous material 4 described later. Prompt.

  Moreover, this invention includes using the same agent as the coating material 5 mentioned later as the adhesive agent 3. FIG.

<Enveloping process of edge with fiber material>
Next, as shown in FIGS. 2A and 2B, the edge 2 is encapsulated with a dry fibrous material 4 through the adhesive 3 applied in the above-described process. That is, the fiber material 4 wraps the portion where the coating is easily peeled off, such as the protruding corner angle 2 a and the narrow end surface 2 b of the edge 2.

  As the fibrous material 4, a nonwoven fabric having a thickness of 0.1 mm to 3 mm, Japanese paper or Western paper is used, and a composite coating layer 6 is formed by impregnating a paint 5 described later. When the above-mentioned paper is used, sanitary paper such as tissue paper and toilet paper is particularly suitable because of its high water absorption.

  The non-woven fabric, Japanese paper, and western paper have a structure in which fibers are irregularly entangled, and are suitable materials for impregnating and holding a fluid such as the uncured adhesive 3 and the paint 5 described later. By using as the fibrous material 4, the composite coating layer 6 having the desired thickness can be easily formed.

  Preferably, the fibrous material 4 is a material that does not affect the coloration of the postscript paint 5 such as white. Or the said fibrous material 4 of the color according to the external appearance of the metal structure 1 is used.

  When a nonwoven fabric is used as the fibrous material 4, the basis weight (weight per unit area) is appropriately adjusted, that is, the amount of fibers constituting the nonwoven fabric is adjusted, and the paint 5 or the adhesive 3 is effectively impregnated later. A composite coating layer 6 is formed.

  Further, the nonwoven fabric as the fibrous material 4 is formed by compressing and smoothing the front and back surfaces, and forms a beautiful coating film 7 on the outer surface of the composite coating layer 6. Alternatively, the composite coating layer 6 having a desired thickness is easily formed by increasing the impregnation rate of the coating material 5 described later without compressing the nonwoven fabric as the fibrous material 4.

  The fibrous material 4 is a sheet-like material, and the edge portion 2 is covered with the sheet-like fibrous material 4. Alternatively, as shown in FIG. 2B, a channel-like fibrous material 4 previously formed into a channel shape having a U-shaped cross section is used, and the channel-like fibrous material 4 is externally fitted to the edge portion 2 so as to be easily and appropriately Cover the edge 2.

<Coating process>
Next, as shown in FIGS. 3A and 3B, the coating material 5 is applied to the outer surface 4a of the fibrous material 4 covering the edge 2 as described above, and the coating material 5 is applied to the fibrous material. The material 4 is impregnated. A coating layer 6 in which the fibrous material 4 is hardened by hardening of the coating material 5 impregnated in the fibrous material 4, that is, a composite coating layer 6 composed of the coating material 5 and the fibrous material 4 is formed. This effectively prevents the paint from peeling off.

That is, the composite coating layer 6 is formed by the coating material 5 penetrating into the irregularly entangled fibers 4 ′ of the fibrous material 4, the permeated coating material 5 is cured, and the fibrous material 4 is made rigid. In other words, the fiber 4 ′ is embedded in the coating material 5 to be applied and rigidized to form the composite coating layer 6.
The coating material 5 may be applied by brushing, roller application, spraying application or the like.

  The paint 5 is a solvent-free urethane silicone resin, urethane silicone epoxy resin, acrylic urethane silicone resin, acrylic resin, urethane resin, or acrylic urethane resin. Preferably, a two-component curable coating is used to form the high-strength composite coating layer 6 in a short time.

  The paint 5 has a viscosity of 4000 mpa · s (under 23 ° C.) or less, preferably 100 to 1000 mpa · s (under 23 ° C.), and promotes penetration into the fibrous material 4. .

  In the present invention, the color of the paint 5 is not particularly limited, and includes the case of a transparent color. When the transparent paint 5 is used, when the transparent paint 5 is impregnated into the fibrous material 4, it enters into the gaps between the multiple fibers 4 ′ constituting the fibrous material 4, and the same fibrous material. The material 4 becomes transparent or translucent (through), and the fibrous material 4 transmits the color of the edge 2 of the metal structure 1 to be exposed. Thereby, while being able to confirm an uncoated part and an unimpregnated part visually, the said transparent or translucent composite coating layer 6 which permeate | transmits the color of the said edge part 2 can be formed. Even if such a transparent or translucent composite coating layer 6 elapses for a long period of time, the color of the edge portion 2 is transmitted and exposed, so that the presence or absence of rust or the like can be visually confirmed during repair.

  As described above, the coating material 5 is impregnated into the fibrous material 4, and at the same time, a part of the coating material 5 forms a strong coating film 7 on the outer surface 4a of the fibrous material 4 (on the composite coating layer 6). The coating film 7 reinforces the composite coating layer 6 while ensuring water tightness.

  Alternatively, the amount of the coating material 5 applied may be adjusted so that the fibrous material 4 is completely impregnated with the coating material 5 to form the composite coating layer 6 having substantially the same thickness as the fibrous material 4 depending on the implementation.

  Preferably, the coating material 5 is applied to the outer surface 4a of the fibrous material 4 in the uncured state of the adhesive 3, and the uncured adhesive 3 is impregnated from the inner and rear surfaces 4b of the fibrous material 4 and The composite coating layer 6 is formed by impregnating the coating 5 from the surface 4a.

  As described above, when the coating material 5 is used as the adhesive 3, the coating material 5 directly applied to the edge portion 2 is impregnated into the fibrous material 4 from the inner and rear surfaces 4 b of the fibrous material 4, and The coating material 5 applied to the outer surface 4a of the fibrous material 4 is impregnated into the fibrous material 4 from the same surface 4a, and the composite coating layer 6 can be reliably formed.

  In the present invention, as shown in FIGS. 4 (A) and 4 (B), the end 4c of the fibrous material 4 is covered with a paint 5 so that the end 4c of the fibrous material 4 is sealed. The composite coating layer 6 having high watertightness is formed.

  That is, as shown in FIG. 4 (A), the adhesive 3 is applied widely, and the paint 5 is applied so as to overlap the entire area where the adhesive 3 is applied. The coating material 5 is fused along the end portion 4c of the fibrous material 4 to firmly cover the end portion 4c. Alternatively, as shown in FIG. 4B, the adhesive 3 is applied broadly, and the paint 5 is applied so as to overlap a part of the area where the adhesive 3 is applied. And the coating material 5 are fused along the end 4c of the fibrous material 4 to firmly cover the end 4c.

  Next, FIG. 5 shows an example in which the composite coating layer 6 is formed on the edge 2 of the guardrail 1 which is a metal structure by the coating method according to the present invention.

  That is, in the example of FIG. 5, the upper and lower ends of the corrugated steel plate 1 c supported by the support pillar 1 b of the guard rail 1 provided at the road shoulder or the boundary between the roadway and the sidewalk are described as the edges 2.

  The adhesive application process, the edge covering process using the fibrous material, and the paint application process at the edge 2 of the guardrail 1 (upper and lower ends of the corrugated steel sheet 1c) are the same as the above-described processes at the edge of the bridge girder. Therefore, the contents already described based on FIGS. 1 to 4 are used here.

  Next, FIG. 6 shows an embodiment of the painting method according to the present invention for metal fittings such as bolts 9 and nuts 10 which are edges (protruding ends) 2 of the metal structure 1. In addition, the small piece 11 of the fibrous material in FIG.

  In this embodiment, as shown in FIG. 6, the adhesive 3 is composed of a large number of small pieces 11 of fibrous material along the outer corners 9a and 10a and the narrow end faces 9b and 10b of the bolt 9 and the nut 10 themselves. Paste through and cover. The small piece 11 is formed by appropriately cutting or cutting the sheet-like fibrous material 4 described above.

  Next, the paint 5 is applied to the outer surface of the exposed portion 11a of the small piece 11 of the fibrous material, and the composite coated layer 6 is formed by impregnating the small piece 11 of the fibrous material with the paint 5.

  As described above, in the painting method according to the present invention, the edge 2 of the metal structure 1 is covered with the fibrous material 4, the paint 5 is applied to the outer surface 4 a of the fibrous material 4, and the paint 5 In the fiber material 4, and a composite coating layer 6 composed of the fiber material 4 and the paint 5 in which the fiber material 4 is hardened by curing the paint 5 impregnated in the fiber material 4 is formed. The composite coating layer 6 effectively prevents the paint from peeling off.

  Further, by covering the end portion 4c of the fibrous material 4 with the coating material 5, the composite coating layer 6 rich in watertightness can be formed.

  Further, in wrapping the edge 2 with the fibrous material 4, it is not excluded to omit the step of applying the adhesive 3 to the edge 2. That is, the edge 2 is covered with the fibrous material 4 without using the adhesive 3, the coating 5 is applied to the outer surface 4 a of the fibrous material 4, and the coated coating 5 is placed inside the fibrous material 4. The case where the fibrous material 4 is held on the edge 2 by using the viscosity of the impregnated coating 5 to form the composite coating layer 6 is not excluded.

  Further, the coating process according to the present invention is not limited to the bridge girder 1 and the guard rail 1 exemplified as the metal structure in FIGS. 1 to 5, but is deteriorated by rust on the steel material portion of the arch bridge or the truss bridge, the frame body of the metal fence, and the like. Needless to say, the present invention can be applied to the edge of a metal structure requiring prevention. Further, the present invention is not limited to the case where the edge portion of the metal structure has a U-shaped cross section, and of course can be applied to the case where the edge portion has an L-shaped cross section.

  In the present specification, the numerical value range indicated by “˜” between the lower limit value and the upper limit value represents all numerical values (integer value and decimal value) between the lower limit value and the upper limit value.

DESCRIPTION OF SYMBOLS 1 ... Bridge girder, guard rail (metal structure), 1a ... Lower flange, 1b ... Post, 1c ... Corrugated steel plate, 2 ... Edge, 2a ... Corner angle, 2b ... Narrow end surface, 3 ... Adhesive, 4 ... Fiber 4 '... fiber, 4a ... outer surface, 4b ... inner back, 4c ... end, 5 ... paint, 6 ... composite coating layer, 7 ... paint film, 8 ... concrete floor slab, 9 ... bolt, 9a ... Outgoing corner angle, 9b ... narrow end surface, 10 ... nut, 10a ... outgoing corner angle, 10b ... narrow end surface, 11 ... small piece of fibrous material, 11a ... exposed portion.

Claims (4)

The edge of the metal structure is covered with a fibrous material made of non- woven fabric, Japanese paper, or Western paper, and the fibers are intertwined irregularly. The paint is applied to the outer surface of the fibrous material, and the paint is applied to the fiber. In a metal structure characterized in that a composite coating layer comprising a paint and a fibrous material formed by impregnating the fibrous material and hardening the fibrous material by curing the paint impregnated in the fibrous material is formed. Edge painting method.   2. The edge painting method for a metal structure according to claim 1, wherein the metal structure is a bridge girder or a guard rail.   The edge painting method in the metal structure according to claim 1 or 2, wherein an end of the fibrous material is covered with the paint. Providing a channel-shaped fibrous material that is shaped into a U-shaped section, both the channel-shaped fiber material of claims 1 to 3, characterized in that fitted outside edge of the metallic structure An edge coating method for the metal structure according to claim 1.

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