Stud dowel painting method and painting roller applied to deck replacement construction method

Abstract

To provide a method of replacing a new floor slab of a bridge that effectively applies paint to the outer surface of a stud dowel planted in a narrow area.SOLUTION: In a floor slab replacement method, when paint is applied to an outer surface of a stud dowel as a previous step of placing concrete in a through hole, a coating roller is prepared, the coating roller comprising at least two sets of roller pairs having axes of rotation that intersect each other in the plane of horizontal projection and being rotatably arrayed along the axis of the stud dowel, each of the roller pairs of the coating roller is inserted from a top part of the stud dowel to be coated to sandwich the stud dowel between mutual rollers of each of the roller pairs, and while maintaining this state, the roller pairs are caused to reciprocate along the axis of the stud dowel and rotate around the axis of the stud dowel as appropriate, so that the paint is applied to the outer surface of the stud dowel.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a stud dowel painting method and painting roller suitable for applying paint to the outer surface of a stud dowel installed on the upper surface of a flange of a steel girder in a bridge deck replacement method. [Background technology]

[0002] The typical method for replacing a bridge deck involves removing the existing deck from the steel girders, scraping and painting the steel girders from which the existing deck was removed, installing the new deck onto the steel girders, melt-fitting stud dowels onto the top of the flanges of the steel girders, and pouring concrete to embed the stud dowels.

[0003] Incidentally, before burying stud dowels by pouring concrete, it is desirable to paint the outer surface of the stud dowels to prevent corrosion. However, the welding of stud dowels is usually carried out through small through-holes formed in the newly constructed deck, making it difficult to efficiently paint the outer surface of the stud dowels.

[0004] As prior art in this regard, for example, Patent Document 1 can be referred to, but the technology disclosed therein relates to the application of paint to roof tiles that are part of a tin roof, and cannot be applied to painting stud dowels used in bridge deck replacement work. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 62-130771 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to propose a painting method and painting roller for stud dowels that can efficiently paint the outer surface of stud dowels, even if the stud dowels are welded and fixed in narrow areas, in a bridge deck replacement method. [Means for solving the problem]

[0007] The present invention relates to a deck replacement method for replacing a bridge deck through a series of steps, which includes removing an existing deck from a steel girder, scraping and painting the steel girder from which the existing deck was removed, installing a new deck on the steel girder after scraping and painting, and melt-planting stud dowels onto the upper surface of the flange of the steel girder through through-holes formed in the new deck, and pouring concrete into the through-holes to embed the stud dowels. In the step before pouring concrete into the through-holes, paint is applied to the outer surface of the stud dowels, This method for painting stud dowels comprises preparing a painting roller having at least two sets of roller pairs whose rotation axes intersect each other in a horizontal projection plane and which are rotatably arranged along the axis of the stud dowel, inserting each of the roller pairs of the painting roller into the top of the stud dowel to sandwich the stud dowel between the rollers of the roller pairs, and while maintaining this state, moving the roller pairs back and forth along the axis of the stud dowel and appropriately rotating them around the axis of the stud dowel to apply paint to the outer surface of the stud dowel.

[0008] The present invention also provides a coating roller for coating a paint on an outer surface of a stud dowel whose lower end is welded and fixed to an upper surface of a flange of a steel girder and held in an upright position from the lower end, a roller pair that pinches the stud dowel from both radial sides and applies paint to the outer surface of the stud dowel by rotating along the axis of the stud dowel; The roller pair is a stud dowel painting roller characterized in that the roller pair is made up of at least two pairs whose rotation axes intersect with each other in a horizontal projection plane and are arranged along the axis of the stud dowel.

[0009] In a painting roller having the above configuration, it is preferable that, as specific means for solving the problem, the roller pair has an elastic member that is connected to each of the axial ends of the rollers that make up the roller pair and applies a biasing force that draws the rollers together to increase the contact pressure of the rollers against the outer surface of the stud dowel, and that the lowermost roller pair of the roller pairs has at least one application means that is positioned in a downwardly opening gap formed between the rollers that make up that roller pair, with its tip portion in contact with the outer surface of the stud dowel and its lower surface in contact with the upper surface of the flange of the steel girder to which the stud dowel is fixed, to apply paint. Effect of the Invention

[0010] According to the present invention, paint can be applied to the stud dowel simply and reliably by clamping the stud dowel on both radial sides with a pair of rollers, moving the pair of rollers back and forth along the axis of the stud dowel, and appropriately rotating the pair of rollers around the axis of the stud dowel. [Brief description of the drawings]

[0011] [Figure 1] This is an external oblique view showing the state in which a new deck is installed on the upper surface of the flange of the steel girder in a deck replacement method, and a stud dowel is melt-insulated through a through hole formed in the new deck. [Diagram 2] FIG. 2 is a cross-sectional view of FIG. [Diagram 3] 1 is a schematic perspective view of an external appearance of a stud dowel painting roller according to an embodiment of the present invention; FIG. [Figure 4] FIG. 2 is a front view of the stud dowel painting roller shown in FIG. 1. [Diagram 5] FIG. 2 is a side view of the painting roller of the stud dowel shown in FIG. 1. [Figure 6] FIG. 2 is a diagram showing the bottom surface of the painting roller of the stud dowel shown in FIG. 1. [Figure 7] FIG. 2 is an explanatory diagram of a method for applying paint to a stud dowel using a paint roller according to the present invention. [Figure 8] FIG. 11 is a perspective view showing the appearance of another embodiment of the application roller according to the present invention. [Figure 9] FIG. 8 is a front view of the application roller shown in FIG. [Figure 10] FIG. 8 is a diagram showing the bottom surface of the application roller shown in FIG. [Figure 11] FIG. 10 is an external perspective view showing only a part of the constituent members of the application roller shown in FIGS. 7 to 9. [Figure 12] FIG. 2 is a perspective view showing an external appearance of an area where paint has not been applied. [Figure 13] FIG. 4 is a diagram showing the positional relationship between the application means and the stud dowel. [Figure 14] FIG. 1 is a perspective view showing the appearance of paint being applied using a painting roller according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will now be described in more detail with reference to the drawings. Fig. 1 is an external perspective view showing a bridge deck replacement method in which a new deck H is installed on the flange upper surface N1 of a steel girder N and a stud dowel S is melt-planted onto the flange upper surface N1 of the steel girder N through a through hole h formed in the new deck H, and Fig. 2 is a cross-sectional view of the state. The present invention relates to a technique suitable for applying paint to the stud dowel S melt-planted into the through hole h.

[0013] FIG. 3 is an external perspective view showing a schematic representation of an embodiment of a stud dowel painting roller according to the present invention, FIG. 4 is a view showing the front of the stud dowel painting roller shown in FIG. 3, FIG. 5 is a view showing the side of the stud dowel painting roller shown in FIG. 3, and FIG. 6 is a view showing the bottom of the stud dowel painting roller shown in FIG. 3.

[0014] Reference numerals 1 and 2 in Figs. 3 to 6 denote two pairs of rollers rotatably held by a frame F and arranged along the axis of a stud dowel S. Roller pair 1 is composed of two rollers 1a combined, and roller pair 2 is composed of two rollers 2a combined. The roller pairs 1 and 2 are arranged so that their rotation axes intersect each other in a projected horizontal plane, more preferably so that they intersect at right angles, so that paint can be applied efficiently. The main body of rollers 1a and 2a may be a puff or sponge that can absorb paint appropriately and apply the absorbed paint, a brush with appropriately adjusted bristles, nonwoven fabric, or the like, but is not limited to the material.

[0015] Furthermore, symbols 3 and 4 in Figures 3 to 6 are spring-like elastic members that are linked to the axial end of roller 1a and the axial end of roller 2a, respectively, and apply a biasing force that draws rollers 1a and rollers 2a together, thereby increasing the contact pressure of rollers 1a, 2a against the outer surface of the stud dowel S, and 5 is a handle that is connected to frame F and is used to move roller pairs 1 and 2 back and forth along the axis of the stud dowel S.

[0016] To apply paint to a stud dowel S using a painting roller configured as described above, roller pair 1, 2 is inserted into the top of the stud dowel S to be painted, and the stud dowel S is sandwiched between rollers 1a, 2a of roller pair 1, 2, as shown in Figure 7. While maintaining this state, roller pair 1, 2 is moved back and forth along the axis of the stud dowel S and rotated appropriately around the axis, which allows paint to be easily applied to the outer surface of the stud dowel S.

[0017] FIG. 8 is an external perspective view showing another embodiment of the application roller according to the present invention, FIG. 9 is a view showing the front of the application roller shown in FIG. 8, FIG. 10 is a view showing the bottom of the application roller shown in FIG. 8, and further, FIG. 11 is an external perspective view showing only a portion of the components of the application roller shown in FIGS. 8 to 10.

[0018] Reference numeral 6 in Figures 8 to 11 denotes application means that is arranged in the downward-opening gap M (see Figure 4) formed between the rollers 2a of the lowermost roller pair 2, with its tip contacting the outer surface of the stud dowel S and its lower surface contacting the upper surface of the flange N1 of the steel girder N to which the stud dowel S is fixed, enabling the application of paint. The application means 6 is made up of a holder 6a suspended from the frame F and a roller, puff, sponge or brush, nonwoven fabric, or the like 6b fixedly held by the holder 6a.

[0019] In the application rollers shown in the above-mentioned Figs. 3 to 6, a gap M is formed between the rollers 2a of the roller pair 2, and therefore it cannot be said that there will be no occurrence of an unapplied area t as shown in Fig. 12.

[0020] In the application roller shown in Figures 8 to 11 above, as shown in Figure 13, the application means 6 can be brought into contact with the upper surface of the stud dowel S and the flange N1 of the steel girder N in the gap M, and as shown in Figure 14, paint can be reliably applied not only to the entire area of ​​the stud dowel S but also around its fixed portion. [Industrial Applicability]

[0021] According to the present invention, it is possible to provide a painting method and a painting roller that can efficiently paint the outer surface of a stud dowel in a method for replacing a new deck slab. [Explanation of symbols]

[0022] 1 roller pair 1a Roller 2 Roller Pair 2a Roller 3 Elastic member 4 Elastic member 5 Handle 6. Painting Method h Through hole N steel girder N1 flange S Stud dowel F Frame M Gap t Unpainted area

Claims

1. In a deck replacement method for bridges, the deck of a bridge is replaced through a series of steps, in which the existing deck is removed from the steel girders, the steel girders from which the existing deck was removed are scraped and painted, a new deck is installed on the steel girders after scraping and painting, and stud dowels are melt-inserted onto the upper surfaces of the flanges of the steel girders through through-holes formed in the new deck, and concrete is poured into the through-holes to embed the stud dowels. In this method, paint is applied to the outer surfaces of the stud dowels before concrete is poured into the through-holes. A method for painting a stud dowel comprising the steps of: preparing a painting roller having at least two pairs of rollers whose rotation axes intersect each other in a horizontal projection plane and which are rotatably arranged along the axis of the stud dowel; inserting each of the pairs of rollers of the painting roller into the top of the stud dowel to be painted so as to sandwich the stud dowel between the rollers of the pairs of rollers; and, while maintaining this state, moving the pairs of rollers back and forth along the axis of the stud dowel and rotating them appropriately around the axis of the stud dowel to apply paint to the outer surface of the stud dowel.

2. A coating roller that applies paint to an outer surface of a stud dowel whose lower end is welded and fixed to the upper surface of a flange of a steel girder and is held in an upright position starting from the lower end, a roller pair that pinches the stud dowel from both radial sides and applies paint to the outer surface of the stud dowel by rotating along the axis of the stud dowel; The roller pair includes at least two sets of rollers whose rotation axes intersect with each other in a horizontal projection plane and are arranged along the axis of the stud dowel, The lowermost roller pair of the roller pairs is disposed in a downwardly opening gap formed between the rollers constituting the roller pair, and has at least one application means whose tip portion contacts the outer surface of the stud dowel and whose lower surface contacts the upper surface of the flange of the steel girder to which the stud dowel is fixed, thereby applying paint.

3. 3. A stud dowel painting roller as described in claim 2, characterized in that the roller pair has an elastic member connected to each of the shaft ends of the rollers that constitute the roller pair and applying a biasing force to attract the rollers toward each other, thereby increasing the contact pressure of the rollers against the outer surface of the stud dowel.

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