JP2003082615A - Method for joining high strength bolt for steel box girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a construction cost and an execution time in the same extent as the friction joint of a high strength bolt, and to inhibit the generation of noises more than the friction joint of the high strength bolt without deteriorating a landscape in the joining of the high strength bolt for a steel box girder. SOLUTION: The joining sections of upper and lower flange sections, which are not conspicuous, are formed in the friction joints of the high strength bolts as seen in conventional devices, and the joining sections of web plate sections, which are conspicuous and are at issue on the landscape, are joined by the high strength bolts on the girder internal-surface side, and are not viewable on the external surface sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining steel box girders.

[0002]

2. Description of the Related Art Normally, steel box girders are used for elevated tracks and railway bridges, but when joining steel box girders along the track, high-strength bolt friction welding or welding is generally used. Is. This construction method will be described with reference to FIGS.

FIG. 5 is a diagram showing an example of high-strength bolt friction welding. A plurality of steel box girders 1 (three in the illustrated example) installed in the width direction of the track are sequentially joined and supported by piers 2, and soundproof walls 3 are installed on both sides of the track. Steel box girders 1 are joined to each other by the belly plate (side surface) of steel box girders and upper / lower flanges (upper / lower surface)
Apply the splicing plates to the seam part from both sides of the inner surface and the outer surface and join them with high strength bolts. Reference numerals 4 and 5 in the figure show the lower flange of the joints and the joint of the abdominal plate. Since the contact surface between the splicing plate and the steel box girder is a rough surface, a frictional force acts between them to act as a drag force against the tension between the steel box girders.

FIG. 6 is a diagram showing an example of welding and joining. Figure 5
Steel box girders 1 installed in the width direction of the track as in the case of
In the case of sequentially joining and performing along the track, the abdominal plate (side surface) of the steel box girder 1 and the joint portion of the upper and lower flanges (upper and lower surfaces) are joined by welding. Reference numerals 6 and 7 in the figure show the lower flange of the joint and the joint of the abdominal plate.

[0005]

In the case of the high-strength bolt friction welding shown in FIG. 5, the construction cost is low and the construction time is short, but the joints of the upper and lower flanges are not conspicuous, but they are belly. At the joints of the plates, some of the splicing plates and high-strength bolts are exposed on the outer surface of the girders and are conspicuous
Also, noise is generated when joining with high-strength bolts.

In the case of the welded joint shown in FIG. 6, the abdominal plate and the welded joints of the upper and lower flanges are not conspicuous and the scenery is good, but the construction cost is high and it is suitable for welding construction and nondestructive inspection after welding. It takes time and affects the construction period.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems. The construction cost and construction time are set to the same level as high-strength bolt friction welding, the scenery is not deteriorated, and the noise generation is high. The purpose is to suppress it more than the friction welding of bolts. Therefore, the invention of claim 1 is characterized in that the joints of the upper and lower flanges of the steel box girders are made by high-strength bolt friction joining, and the joints of the abdominal plates are made by high-strength bolting the inner surface of the girders. . Further, the invention of claim 2 is characterized in that the reinforcing member is welded to the end plate and the abdominal plate which are provided so as to project to the inner surface side of the girder, and the end plates are butted to each other and fastened with a high-strength bolt to join them. Further, in the invention of claim 3, a reinforcing member is welded to the end plate and the anchor plate and the abdomen plate which are provided so as to project to the inner surface side of the girder, the end plates are butted to each other, and the anchor plates are fastened and joined with a high-strength bolt. It is characterized by According to the invention of claim 4, the reinforcing members welded to the abdominal plate are made to abut on the girder inner surface side in parallel with the upper and lower flanges at the girder ends, and the abutting plates are attached to the abutted reinforcing members from the upper and lower surfaces. It is characterized in that it is applied and fastened with high strength bolts and joined.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a conceptual diagram for explaining a high strength bolt joining method for steel box girders according to the present invention. A plurality of steel box girders 1 (three in the illustrated example) installed in the width direction of the track are sequentially joined to form a pier 2
It is the same as the conventional method that the soundproof wall 3 is installed on both sides of the track. However, in the present invention, as shown by the point P in the figure, the inconspicuous joints of the upper and lower flanges are made by high-strength bolt friction welding as in the conventional case, and the abdominal plate portion which is conspicuously a problem in the landscape is formed. The joint part is characterized in that it is joined with a high-strength bolt on the inner surface side of the girder so that it cannot be seen on the outer surface side. With this joining method, the construction cost and construction time are comparable to those of high-strength bolt friction welding, the scenery is good, and the upper and lower flanges are the same as before, but
Since the abdominal plate portion is joined on the inner surface side, noise can be made relatively low.

FIG. 2 is a diagram showing an embodiment of a method for joining high-strength bolts to a steel box girder according to the present invention. End plates 12 are welded to the ends of the belly plate 10 and the lower flange 11 of the steel box girder (the upper flange is not shown) toward the inner surface of the girder, and a plurality of rib plates 13 for reinforcement are provided on the end plate and the belly plate. To weld. Then, the end plates are abutted against each other and fastened with high-strength bolts 14 to join them (tensile joining). The high-strength bolt 14 acts as a drag force against pulling between the steel box girders. As in the conventional case, the upper and lower flanges are joined to each other with high-strength bolts 15 by applying splicing plates to the joints from both the inner surface and the outer surface (friction welding).

FIG. 3 is a view showing another embodiment of the method for joining high-strength bolts to steel box girders according to the present invention. The end plate 12 is welded to the ends of the belly plate 10 and the lower flange 11 of the steel box girder (the upper flange is not shown) toward the inner surface of the girder, and at a predetermined distance from the end plate 12 in parallel with the end plate. The anchor plate is welded to the abdomen plate toward the inner surface of the girder, and the rib plates 20 for reinforcement are welded to the abdomen plate, the end plate and the anchor plate. Then, the end plates are abutted against each other, and the anchor plates are fastened with high-strength bolts 22 to join them (tensile joining). The high-strength bolt 22 acts as a resistance against the pulling between the steel box girders. As for the upper and lower flanges, as in the past, high-strength bolts 15 are provided by applying splicing plates to the joints from both the inner and outer surfaces.
Join with (friction welding).

FIG. 4 is a diagram showing another embodiment of the method for joining high-strength bolts to steel box girders according to the present invention. A plurality of reinforcing rib plates 30 are welded to the ends of the abdominal plate 10 of the steel box girder in parallel to the upper and lower flanges toward the inner surface of the girder, and the rib plates are butted to each other and the abutment plates are attached to the upper and lower surfaces thereof. 31 is applied and joined with the high-strength bolt 32 (friction joining). As in the conventional case, the upper and lower flanges are joined to each other with high-strength bolts 15 by applying splicing plates to the joints from both the inner surface and the outer surface (friction welding).

[0012]

As described above, according to the present invention, the joint portion of the upper and lower flanges of the steel box girder that is not conspicuous in the view is made by high-strength bolt friction joint, and the joint inner surface of the girder is conspicuous in the joint of the abdominal plate that is conspicuous in the view. Since high-strength bolt joints are used on the side, the construction cost and construction time are comparable to those of high-strength bolt friction joints. The landscape is improved over high-strength bolt friction welding because the splicing plate and some of the high-strength bolts are not exposed outside the girder when joining the abdominal plates. The generation of noise is suppressed as compared with high-strength bolt friction welding because bolting of the abdominal plate is performed inside the girder.

[Brief description of drawings]

FIG. 1 is a conceptual diagram illustrating a method for joining high-strength bolts to a steel box girder of the present invention.

FIG. 2 is a diagram showing an example of a method for joining high-strength bolts to a steel box girder.

FIG. 3 is a diagram showing another embodiment of a method for joining high-strength bolts to a steel box girder.

FIG. 4 is a diagram showing another embodiment of a method for joining high-strength bolts to a steel box girder.

FIG. 5 is a diagram showing an example of high-strength bolt friction welding.

FIG. 6 is a diagram showing an example of welding and joining.

[Explanation of symbols]

1 ... Steel box girder, 2 ... Bridge pier, 3 ... Soundproof wall, 10 ... Belly plate, 11
... lower flange, 12 ... end plate, 13 ... rib plate, 14 ... high-strength bolt, 20 rib plate, 21 ... anchor plate, 22 ... high-strength bolt, 30 ... rib plate, 31 ... splicing plate, 32 ... high strength bolt.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takao Umeda             2-2-2 Yoyogi, Shibuya-ku, Tokyo Tohnichi             Inside the passenger railway (72) Inventor Shinji Kudo             2-2-2 Yoyogi, Shibuya-ku, Tokyo Tohnichi             Inside the passenger railway (72) Inventor Tatsuya Kaneko             2-2-2 Yoyogi, Shibuya-ku, Tokyo Tohnichi             Inside the passenger railway F-term (reference) 2D059 AA08 GG55                 2E125 AA14 AC14 AG32 AG43 CA06                 3J001 FA06 FA07 FA15 GA02 GB01                       HA02 JA10 JB02 KA07 KA09                       KA22 KB04

Claims (4)

[Claims] 1. A steel box girder characterized in that the joints of the upper and lower flanges of the steel box girder are high-strength bolt friction joints, and the joint of the abdominal plate is the high-strength bolt joint on the inner surface of the girder. High strength bolt joining method. 2. A high member according to claim 1, wherein a reinforcing member is welded to the end plate and the abdominal plate provided so as to project toward the inner surface of the girder, and the end plates are butted and fastened with a high-strength bolt. Power bolt joining method. 3. A reinforcing member is welded to the end plate and the anchor plate and the abdominal plate that are provided so as to project to the inner surface side of the girder,
The high-strength bolt joining method according to claim 1, wherein the end plates are abutted against each other and the anchor plates are fastened and joined with high-strength bolts. 4. Reinforcing the reinforcing members welded to the abdominal plate by projecting to the inner side of the girder parallel to the upper and lower flanges at the ends of the girder, and abutting plates from the upper and lower surfaces of the abutting reinforcing members, The high-strength bolt joining method according to claim 1, wherein the joining is performed by tightening with a force bolt.