JPH0681312A - Joint structure for main girder of bridge and the like - Google Patents

Abstract

PURPOSE:To improve a joint structure by fixing a thickening member to the lower face of an upper flange at the joint position of a main girder having an I-type cross section, fixing the end plates to their end faces, and joining a web and a lower flange section with bolts via splice plates. CONSTITUTION:A thickening member 5 is fixed to the joint section lower face 2a of the upper flange 2 of a main girder 1 having an I-type cross section by welding. End plates 6 are fixed to end faces of the flange 2 and the member 5 by welding. A lower flange 3 and a web 4 are fastened with bolts 10 via slice plates 9, 13 respectively to integrate the adjacent main girders 1. The flange 2 and the thickening member 5 may be joined with bolts via the slice plates. The upper face of the upper flange 2 is made flat, no modification is required for a lining plate to be installed on the upper face, normal horizontal force can be coped with by a thickening plate and the end plates 6, bolt fastening man-hours can be reduced, the thickening member 5 is reinforced by a splice plate against large horizontal force, and the strength can be improved in response to the situation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main girder joint structure used for permanent or temporary bridges or structures.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing a joint structure generally used in the past, and upper and lower flanges 51, 52 of a main girder 50.
The splicing plate 54 is fixed to the abdominal plate 53 with bolts and nuts to join them. Therefore, in this conventional example, the stress acting on the joint portion is transmitted by the frictional force between each flange, the abdominal plate and each splicing plate.

Next, FIG. 6 shows a connecting structure shown as Japanese Patent Publication No. 2-37449. That is, this application discloses an upper flange 60, a lower flange 61, and a web 62.
In the connecting portion of the girder material (main girder) 63 configured as described above, a connecting plate 64 orthogonal to the longitudinal direction of the girder material 63 is provided on the end surface of the upper flange 60 on which the compressive stress acts, and the upper flange 60 and the abdominal plate 6.
The upper part of 2 is fixed by welding. Then, the connecting plate 64 is directly butted, and the bolts 65 are inserted into the through holes provided in the connecting plate 64 and fastened with nuts to fix the connecting plate 64.

A reinforcing plate 66 is fixed between the lower portion of the connecting plate 64 and the abdominal plate 62 by welding, if necessary. FIG. 6 shows a state in which the reinforcing plate 66 is applied. The abdominal plate 62 in the butted state is fixed with a slight gap, and further, the other part of the girder member 63, that is, the abdominal plate 6 is provided.
The connecting portion of the lower flange 61 and the portion other than the upper portion of 2 are fixed by a connecting plate 67 and a bolt 68.

In this conventional example, when a load acts on the girder material and a tensile response is generated in the lower part of the girder, it is absorbed by the connecting plate and the bolts, while the compressive stress generated in the upper part of the girder material causes the protrusion of the connecting plate. Absorb by lap joint.

[0006]

The first conventional example is as follows.
Since the splicing plate is provided on the upper part of the connecting portion, it is necessary to modify the lining plate, and it is necessary to tighten a large number of bolts and nuts, resulting in a problem of poor construction efficiency.

Next, in the second conventional example, the upper surface of the upper flange is flat, there is no need to modify the lining plate, and the number of bolts is reduced. Since a plate or the like is applied, the structure of the upper flange portion is complicated, and it takes time to manufacture and assemble the connecting portion.

Further, it is necessary to align the bolt holes when the main girders are butted, and it is necessary to insert the bolts into the holes and tighten the nuts.

[0009]

DISCLOSURE OF THE INVENTION The present invention is a joint structure for a main girder composed of upper and lower flanges and a belly plate, wherein a thickening member is fixed to the joint portion of the upper flange and the end face of the girder in the lateral direction is fixed. On the other hand, the end plates are fixed, while the lower flange and the abdominal plate are perforated and the splicing plate is fixed to this place with bolts. It is a joint structure of the main girders in the characteristic bridges.

Further, the present invention has a structure in which a plurality of through holes capable of being spliced and joined to the upper flange and the main girder are formed, and the splicing plate is fixed if necessary.

[0011]

According to the present invention, since the upper surface of the upper flange is formed flat, it is not necessary to modify the lining plate or the like installed on the upper surface of the upper flange. In addition, the simple structure does not use bolts to connect the upper flanges, and the efficiency of manufacturing and assembling work can be promoted. Further, the compressive force acting on the upper flange is directly transmitted by the end plate, and a thickening member is arranged on the upper flange to exert sufficient strength. Even if an error occurs in the abutment of the upper flange, the abutting surface is widened by the end plates arranged on the upper flange and the thickening plate, and the error is accommodated within the plate thickness of the end plate.

[0012]

1 to 3 are a perspective view, a side view and a side view showing a joint portion showing an embodiment of the present invention. The main girder 1 used for a bridge girder or the like is composed of upper and lower flanges 2 and 3 and a web 4 that connects the flanges 2 and 3, and has an I-shaped cross section as an example. Then, in order to be used for truck transportation and the like, it is transported in a factory with a length of 6 m to 11 m arranged in advance. Therefore, in order to form a long object such as a bridge girder, this main girder is spliced at a construction site and installed at a predetermined position.

According to the present invention, the thickening member 5 is fixed to the lower surface 2a of the joint portion of the upper flange 2 of the main girder 1 by means such as welding, and the main girder 1 and the end surface 1a of the main girder 1 face each other. An end plate 6 is fixed by welding or the like to the joint flange, particularly to the upper flange 2 and the end surface of the thickening member 5 in a direction orthogonal to the longitudinal direction of each main girder 1.

On the other hand, the lower flange 3 of the joint portion is provided with a plurality of through holes 7 along its longitudinal direction, and a splicing plate 9 having holes 8 similar to the above through holes 7 is separately prepared. The main girders 1 and 1 adjacent to each other are integrated by fastening them with bolts 10.

Further, a plurality of through holes 11 are provided at appropriate positions of the abdominal plate 4 at the joint portion, while the through holes 1 are provided.
A splicing plate 13 having a through hole 12 similar to that of 1 is bolted to the front and back of the abdominal plate 4.

If necessary, the upper flange 2 and the thickening member 5 are provided with a plurality of through holes 14 as shown in FIG. 4, and both of the upper flange 2 and the thickening member 5 or The splicing plate 15 can be fixed to either one by bolts.

[0017]

According to the present invention, since the upper flange upper surface is formed flat, it is not necessary to modify the lining plate or the like installed on the upper flange upper surface. In addition, the normal horizontal force is dealt with by the thickening plate and the end plate, and the number of processes is reduced by eliminating the need for bolting at the butting points. Further, with respect to a large horizontal force, the splicing plate can be fixed to the upper flange and the thickening plate to increase the strength. INDUSTRIAL APPLICABILITY The present invention has a joint structure that can be selectively used depending on the situation, is not only excellent in economic efficiency, but also exhibits high strength, and is an invention excellent in industrial use.

[0018]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing the same joint portion.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view showing another joint structure of the same.

FIG. 5 is a side view showing an example of a conventional joint structure.

FIG. 6 is a side view showing another conventional example of the above.

[Explanation of symbols]

 1 main girder 2 upper flange 3 lower flange 4 belly plate 5 thickening member 6 end plate 7 through hole 8 through hole 9 splice plate 10 bolt 11 through hole 12 through hole 13 splice plate 14 spout hole 15 splice plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinichi Sawada 1-6-5 Nihonbashihonmachi, Chuo-ku, Tokyo Maru Fuji Sheet Pile Co., Ltd.

Claims (2)

[Claims] 1. A joint structure for a main girder comprising upper and lower flanges and a belly plate, wherein a thickening member is fixed to a joint portion of an upper flange and an end plate is fixed to a lateral end face of the girder material. A main girder in a bridge, etc. characterized by forming a through hole in the lower flange and abdominal plate, fixing a splicing plate to this location with bolts, and further adhering the end plates of both main girders to integrate them. Joint structure. 2. The joint structure for a main girder according to claim 1, wherein a plurality of through holes capable of splicing and joining are formed in the upper flange and the main girder.