JP2001164517A - Joining-section structure of post and girder in railway viaduct and railway viaduct using joining-section structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which has required load-carrying performance and rigidity to horizontal force in an earthquake and which can also absorb an error on the execution of works at a site in the joining-section structure of a space rigid frame type railway viaduct composed of a round-shaped steel-pipe main girder, a concrete-infilled steel pipe post and a steel horizontal girder. SOLUTION: A socket steel pipe 3 is arranged so as to penetrate the underside 1' of a round-shaped steel-pipe main girder 1 and project to a lower section, and then welded and joined at the position of the underside 1', and the upper end of the socket steel pipe 3 is butt-welded and joined to the top face 1" of the round-shaped steel-pipe main girder 1. The projecting section 3' of the socket steel pipe 3 is inserted into the steel pipe post 2, the insides of these projecting section 3' and post 2 are filled with concrete 6, and both steel pipes 2, 3 are fixed mutually. A square-shaped steel pipe is butt-welded and joined to the round-shaped steel-pipe main girder 1 as the horizontal girder 4. A diaphragm 5 is installed into the round-shaped steel-pipe main girder 1 corresponding to the position of the butt-welding and joining, and the inside of the round-shaped steel-pipe main girder 1 between the diaphragm 5 is filled with concrete 6'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway viaduct in which a main girder structure in which a concrete slab is disposed above a steel girder is supported by a column having a concrete-filled steel pipe as a substructure, and in particular, has a large number of short spans. Suitable for ramen-type viaducts that are continuous over the span.

[0002]

2. Description of the Related Art Conventionally, a concrete frame structure in a short span is applied to a railway viaduct, except for a section that must be a long span due to crossing properties such as rivers, mainly due to economical viewpoints and noise problems caused by train running. Have been.

[0003] On the other hand, railway viaducts using steel girders are inferior in economics as compared with concrete structures, but are superior in strength and material stability, and are advantageous in terms of production and construction because they are lightweight. If noise and economy are improved, a reasonable structure can be achieved. In addition, the use of lightweight steel girders provides excellent seismic resistance and contributes to simplification of the substructure shape.

[0004] In the case of a steel girder, a concrete floor slab is arranged on the girder from the viewpoint of track laying. In this case, a composite girder can be designed by integrating the steel girder and the concrete floor slab with an appropriate slip stopper. This type is advantageous because the combined action of the girder and the floor slab can reasonably resist the bending moment of the span.

[0005] With respect to the noise surface raised as a problem of the steel girder structure, it can be dealt with by comprehensive vibration damping measures such as sleepers, tracks and in-girder measures.

On the other hand, the problem of economic efficiency becomes economical by applying an inexpensive round steel pipe having marketability to the main girder (see Japanese Patent Application No. 11-0174737). In addition, a concrete-filled steel pipe with high toughness is applied as a column member, a lightweight girder is used as the main girder member between columns, and furthermore, the main girder members are joined by horizontal girder at the column member position, thereby providing a three-dimensional structure. A simple ramen structure is formed, ensuring seismic performance against large-scale earthquakes, extending the span in the bridge axis direction, and omitting the underground beams, thereby shortening the construction period and reducing the construction cost (Japanese Patent Application No. 11-071599). No.).

[0007]

As described above, a railway viaduct having a three-dimensional rigid frame structure in which round steel pipe main girders are connected by steel cross girders and the connecting position is supported by concrete-filled steel pipe columns having excellent toughness is economical and economical. It can be said to be a form that is competitive in terms of construction period.

In such a type, a point to be noted in terms of structure is the structure of the junction where the main girder and the column and the cross girder intersect. Since a considerable amount of bending moment or shearing force acts on this joint due to the horizontal force during an earthquake, it is required to have a load-carrying capacity and stiffness that can withstand this.

Regarding the structure of the joint, a branch joint type used for a steel pipe truss structure is considered. In this method, concrete-filled steel pipes and cross beams are butt-welded to the main girder of a round steel pipe.Large deformation force near the butt portion and punching shear failure along the butt weld portion due to the large acting force on the joint. Can occur. In addition, in this type, since a construction error of a concrete-filled steel pipe column built locally cannot be absorbed, there is a problem in construction.

The present invention has been made to solve the above-mentioned problems, and relates to a joint structure of a three-dimensional rigid-frame railway viaduct comprising a round steel pipe main girder, a concrete-filled steel pipe column, and a steel cross girder during an earthquake. It is an object of the present invention to provide a structure having required load-carrying performance and rigidity even for a large acting force against a horizontal force, and capable of absorbing local construction errors.

[0011]

A joint structure between a column and a girder in a railway viaduct according to claim 1 of the present application comprises a round steel pipe main girder on which a concrete floor slab on which a track is laid is disposed, and a concrete structure. In the joint structure between the steel pipe column filled with, and the steel girder arranged substantially perpendicular to the round steel pipe main girder, the socket steel pipe having an outer dimension smaller than the inner diameter of the steel pipe column, While being joined to the round steel pipe main girder so as to penetrate at least the lower surface of the die steel pipe main girder, the projecting portion of the socket steel pipe is inserted into the steel pipe post, and the inside of the steel pipe post and the socket steel pipe is inserted. Is filled with concrete.

In the present joint structure, a gap generated between the outer dimension of the socket steel pipe and the inner diameter of the steel pipe column can be used for absorbing errors during construction. In addition, since the socket steel pipe is fitted on the steel pipe column on site, a joint including the socket steel pipe can be manufactured in advance at a factory. Furthermore, at the time of erection, since the round steel pipe main girder can be temporarily received at the upper end of the steel pipe column,
Excellent workability.

A joint structure between a column and a girder in a railway viaduct according to a second aspect of the present invention includes a round steel pipe main girder on which a concrete floor slab on which a track is laid is disposed, and a steel pipe column filled with concrete. And, in the joint structure between the round steel pipe main girder and a steel cross girder arranged substantially horizontally at right angles, a socket steel pipe having an inner dimension larger than the outer diameter of the steel pipe column is formed by the round steel pipe main girder. While being joined to the round steel pipe main girder so as to penetrate at least the lower surface, the steel pipe column and the socket steel pipe are filled with concrete while the steel pipe column is inserted into the socket steel pipe. It is characterized by.

In the present joint structure, an error at the time of construction can be absorbed by the gap generated between the inner diameter of the socket steel pipe and the outer dimension of the steel pipe column.

Further, since the steel pipe column can be inserted into the round steel pipe main girder through the socket steel pipe, the socket steel pipe and the steel pipe column can be inserted without projecting a considerable amount of the socket steel pipe from the lower surface of the round steel pipe main girder. And a predetermined fixing length can be secured.

A third aspect of the present invention is the joint structure according to the first or second aspect, wherein a steel cross beam is butt-joined to the round steel pipe main girder, and a diaphragm is provided inside the round steel pipe main girder at the butt joint position. And concrete is filled between the diaphragms.

In this case, in addition to the load transmission due to the fact that the round steel pipe main girder and the socket steel pipe are joined at the lower surface penetrating position of the round steel pipe main girder against the horizontal force during the earthquake in the main girder direction,
Since the bearing pressure is transmitted between the socket steel pipe and the concrete filled around the socket steel pipe, it is easy to secure required strength and rigidity.

Since the filled concrete is completely restrained by the round steel pipe serving as the main girder and the diaphragm arranged in the main girder, the concrete does not shift within the main girder and can sufficiently contribute as a bearing member.

On the other hand, with respect to the horizontal force at the time of the earthquake in the direction of the steel cross beam, the diaphragm is installed in the main girder of the round steel pipe at the connection position with the steel cross beam to stiffen it. Local destruction is suppressed, and necessary strength and rigidity can be imparted to the joint.

According to a fourth aspect of the present invention, in the joint structure according to the first, second or third aspect, the steel cross beam is a steel pipe, and the steel cross beam is inside the steel cross beam and at least in the vicinity of an attachment position to the round steel pipe main girder. It is characterized by being filled with concrete.

In this case, the shear lag phenomenon that occurs in the steel pipe portion of the cross beam is alleviated by filling with concrete, which is advantageous for design stress inspection.

According to a fifth aspect of the present invention, the height of the steel horizontal girder is 70% or more of the height of the round steel pipe main girder.

Accordingly, when the tensile stress generated in the flange of the steel cross beam is transmitted to the round steel pipe of the main girder, out-of-plane deformation generated in the round steel pipe at the mounting position of the steel cross beam is suppressed, and between the two members. Smooth stress transmission is performed.

That is, when the height of the steel cross beam is smaller than the height of the main girder of the round steel pipe, the stress at the joining position of the steel cross beam becomes large and the design becomes difficult. When the height is 70% or more of the height of the main girder of the round steel pipe, relatively sufficient strength and rigidity of the joint can be obtained. In addition, when it is 80% or more, a sufficiently satisfactory result is obtained structurally.
More preferably, it is 80% or more. In addition, the height mentioned here means the height of the steel cross beam in the vertical direction.

According to a sixth aspect of the present invention, the main girder of the round steel pipe is disposed immediately below a track laid on a concrete slab.

More specifically, this means a case where a main girder of a round steel pipe is arranged under one set of tracks in a well-balanced manner. In this case, for example, it is preferable that the width of the track and the width of the main girder of the round steel pipe be substantially the same, and that the center of the track and the center of the main girder of the round steel pipe be aligned in substantially the same vertical plane. Is not limited to almost matching
Regardless of whether the width of the main girder of the round steel pipe is slightly larger or smaller than the track width, it is only necessary to arrange the main girder in a well-balanced manner.

Thus, the load of the train traveling on the track is efficiently transmitted to the main girder of the round steel pipe, and the bending moment and the shearing force generated in the concrete slab can be reduced.

According to a seventh aspect of the present invention, in the joint structure according to the first aspect, a projecting member or a projection is provided on an upper end portion or an upper inner surface of the steel pipe column so as to project inward.
A projecting member or a protrusion is provided on a lower end portion or a lower outer surface of the socket steel pipe so as to protrude outward.

It should be noted that the phrase “on the inner surface of the upper portion of the steel pipe column” does not necessarily mean that the overhanging member or the projection is provided only on the upper portion, and that the overhanging member or the projection is formed on other portions. Is also good. Further, both the overhang member and the projection may be used in combination.

Similarly, the lower outer surface of the socket steel pipe is not necessarily limited to the case where the overhang member or the projection is provided only in this portion.

With this configuration, when an earthquake load is applied, a vertical displacement force generated between the steel pipe column and the socket steel pipe is generated by the overhanging members and projections provided inside the steel pipe column and outside the socket steel pipe. It is transmitted through the concrete and the escape of the socket steel pipe is suppressed. Due to this slip-out suppressing effect, the deformation of the joint when a load at the time of an earthquake is applied is suppressed, and the fear of derailment of the train or the like is eliminated.

According to an eighth aspect of the present invention, in the joint structure according to the second aspect, a projecting member or a projection is provided on a lower end portion or an inner surface of the socket steel pipe so as to protrude inward. An overhanging member or a protrusion is provided on the upper outer surface to protrude outward.

In the invention according to claim 1 and the invention according to claim 2, the magnitude relation between the diameter of the steel pipe column and the diameter of the socket steel pipe is reversed, and claim 8 has the same configuration as claim 7. In this case, the same effect as that of claim 7 can be obtained, that is, the effect of suppressing deformation of the joint portion when an earthquake load is applied can be obtained.

The railway viaduct according to the ninth aspect is characterized in that:
8. A rigid-frame railway viaduct having a joint structure between a column and a girder in the railway viaduct according to any one of 8 above, wherein the bending strength of the steel pipe column is bending of the socket steel pipe, the round steel pipe main girder, and the steel cross girder. It is characterized in that it is set so as to be smaller than the proof stress, so that a plastic hinge is formed on the steel pipe column when a load during an earthquake is applied.

The concrete-filled steel pipe column has excellent load-bearing deformation performance because the concrete is constrained by the steel pipe. By forming a plastic hinge when a load during an earthquake acts on this steel pipe column, A structure excellent in energy absorption performance at the time is obtained.

Further, by forming a plastic hinge on the steel pipe column, damage during an earthquake is concentrated here, so that the socket steel pipe, the round steel pipe main girder, and the steel cross girder can maintain a healthy state. As a result, only the plastic hinge portion of the steel pipe column, which is relatively easy to repair after the earthquake, needs to be repaired, and the restoration can be performed in a short time.

The ninth aspect of the present invention is intended to determine the specifications of the members with the intention of reducing the bending strength. More specifically, the bending strength of the steel pipe column is smaller than the bending strength of the socket steel pipe, the round steel pipe main girder and the steel cross girder. It is obtained by designing to be.

[0038]

1 and 2 show a vertical structure of an embodiment (corresponding to claims 3, 5, and 6) of a joint structure between a column and a girder in a railway viaduct according to claim 1 of the present application. It is a sectional view and a plan view.

In the example shown, the main girder 1 using a round steel pipe is used.
A socket steel pipe 3 having an outer dimension smaller than the inner diameter of the steel pipe column 2 (forming a concrete-filled steel pipe at the completion of construction)
Are arranged so as to penetrate the lower surface 1 ′ of the round steel pipe main girder 1 and protrude downward, and to weld the round steel pipe main girder 1 and the socket steel pipe 3 by welding at the position of the lower surface 1 ′. The upper ends of the socket steel pipes 3 whose front ends are cut so as to be in line with the butting parts with the steel pipe main girder are butted against the upper surface 1 ″ of the round steel pipe main girder 1, and the two steel pipes are welded together.

Next, the protruding portion 3 ′ of the socket steel pipe 3 is inserted into the steel pipe post 2, and the steel pipe post 2 and the socket steel pipe 3 are inserted through the driving hole 7 installed on the upper surface 1 ″ of the round steel pipe main girder 1. Is filled with concrete 6, and the steel pipes 2 and 3 are fixed to each other via concrete.

Further, 80% of the girder height of the main girder 1 of the round steel pipe.
A square steel pipe having a height of 1 mm and having an end portion cut along the abutment portion with the main girder is a horizontal girder 4 and a round steel pipe main girder 1.
At least two diaphragms 5 are installed inside the round steel pipe main girder 1 corresponding to the butt joint position, and a driving hole 7 is formed inside the round steel pipe main girder 1 between the diaphragms 5. Fill 'from concrete 6'. Thereby, the joint structure of the present embodiment is formed.

Above the main girder 1 of the round steel pipe, concrete 12 is cast by using a steel plate 11 joined to the upper side of the round steel pipe and bent upward to form a concrete floor. A plate 10 is formed, and a railway track 13 is laid directly above the plate 10. Reference numeral 14 in the figure denotes a welding wire mesh for reinforcing the concrete 12, and reference numeral 13a
Is a rail constituting the track 13.

In this embodiment, the socket steel pipe 3 has a round cross section. However, if the socket steel pipe 3 has an outer dimension smaller than the inner diameter of the steel pipe column 2 and can be inserted into the steel pipe column, it has a square cross section. The shape is not limited. Further, depending on the condition of the load level acting on the joint, the socket steel pipe 3 may not be welded to the upper surface 1 ″ of the round steel pipe main girder 1.

From the viewpoint of improving the load transmission performance of both steel pipes through concrete at the joint between the protruding portion 3 'of the socket steel pipe 3 and the steel pipe column 2, as described in claim 7 of the present application, A stopper such as a protrusion may be provided on the outer surface of the socket steel pipe 3 and the inner surface of the steel pipe column 2 located there.

Although the steel cross beam 4 is a square steel pipe, its cross-sectional shape such as a round shape or an H shape is not limited. Furthermore, the structure of the concrete slab 10 installed above the round steel pipe main girder 1 is not limited as long as it can contribute as a slab capable of supporting a track.

FIG. 3 shows a vertical cross section of an embodiment of a joint structure between a column and a girder in a railway viaduct according to a second aspect of the present invention.

In this example, a round steel pipe main beam 1 is
A socket steel pipe 3 having an inner diameter larger than the outer diameter of the round steel pipe main girder 1 is formed so as to penetrate the lower surface 1 ′ of the round steel pipe main girder 1. The socket steel pipe 3 is welded and joined at the position of the lower surface 1 ′, and the upper end of the socket steel pipe 3 is connected to the round steel pipe main girder 1.
And the two steel pipes are welded to each other.

Next, the steel pipe column 2 is inserted into the inside of the socket steel pipe 3, and the driving hole 7 installed on the upper surface 1 ″ of the round steel pipe main beam 1 is inserted.
Concrete 6 inside the steel pipe column 2 and socket steel pipe 3
And the steel pipes 2 and 3 are fixed to each other via concrete.

The socket steel pipe 3 need not have a round cross section as long as it has an inner dimension larger than the outer diameter of the steel pipe column 2. In addition, at the joint position between the socket steel pipe 3 and the steel pipe column 2, from the viewpoint of improving the load transmission performance of both steel pipes,
As described in claim 8 of the present application, a slip stopper such as a protrusion may be provided on the inner surface of the socket steel pipe 3 and the outer surface of the steel pipe column 2.

FIG. 4 shows a vertical cross section of another embodiment of the joint structure according to claim 1 of the present application.

In this example, the socket steel pipe 3 is arranged so as to penetrate the upper surface of the round steel pipe main girder 1, and the two steel pipes are welded to each other at the positions of the lower surface 1 'and the upper surface 1 ". Since the welding at 1 "can be performed from the outer surface, the productivity is improved. In addition, there is an advantage in production and construction that concrete can be filled into the steel pipe column 2 and the socket steel pipe 3 from the opening at the upper end of the socket steel pipe 3.

After filling the socket steel pipe 3 with concrete, a cover 8 is provided at the upper end of the socket steel pipe 3 to make it possible to compensate for the cross-sectional defect of the round steel pipe main girder 1.

FIG. 5 shows a vertical cross section of an embodiment of a joint structure between a column and a girder in a railway viaduct according to claim 4 of the present application.

In this example, concrete 6 "is filled from a casting hole 7" in the vicinity of the mounting position with the main girder 1 inside the cross girder 4 using a square steel pipe. The concrete filling range is not particularly limited as long as it satisfies predetermined requirements, such as alleviating the shear delay phenomenon occurring in the square steel pipe and improving the rigidity of the joint.

FIG. 6 shows a vertical cross section of an embodiment of a joint structure between a column and a girder in a railway elevated column according to claim 7 of the present application.

In this example, a ring-shaped projecting member 14 is provided at the upper end of the steel pipe column 2 so as to project inward and outward, and a ring-shaped projecting member 14 'is provided at the lower end of the socket steel pipe 3 to project inward and outward. , Concrete 6.

Thus, even if a force in the pull-out direction acts on the socket steel pipe 3 due to horizontal force or the like during an earthquake, the steel pipe column 2
Overhang members 14 attached to both the
Since the extraction force generated in the socket steel pipe 3 is transmitted to the steel pipe column 2 via the concrete 6 by 14 ', a large extraction suppression effect can be obtained.

Also, the overhang member 14 attached to the upper end of the steel pipe column 2 has an advantage that it can be used as a support when the round steel pipe main girder 1 is erected on the steel pipe column 2.

FIG. 7 shows a vertical cross section of another embodiment of the joint structure according to claim 7 of the present application. A projection 15 is provided on the upper inner surface of the steel pipe column 2. A projection 15 'is provided on the lower outer surface, and concrete 6
Is filled.

As a result, withdrawal of the socket steel pipe 3 can be suppressed by the same operation as in the embodiment of FIG.

As the method of providing the projections 15 and 15 ', a method of using a steel pipe with an inner or outer rib in the relevant portion, a method of attaching a reinforcing steel bar, a flat steel, or the like to the steel pipe by welding, and the like can be considered.

FIG. 8 shows an embodiment according to the ninth aspect of the present invention, in which a seismic load P acts on a rigid-frame type viaduct consisting of a round steel pipe main girder 1, a steel pipe column 2 and a steel cross girder 4. 1 shows a state in which a plastic hinge 16 is formed on a steel pipe column 2.

As in this example, by repairing the damage at the time of the earthquake to the steel pipe column 2 below the socket steel pipe 3 (forming the plastic hinge 16), the repair work becomes only the steel pipe column 2,
Recovery after the earthquake can be achieved early.

FIG. 9 shows an example of the overall structure of a three-dimensional rigid-frame railway viaduct using the permanent joint type. As the overall structure, a three-dimensional rigid frame is formed by connecting a parallel single-line structure composed of two round steel pipe main girders 1 with steel cross girders 4, and can constitute a railway viaduct having a double-track structure.

[0065]

(1) Claims 1 and 2 of the present invention
Is a type in which a socket steel pipe and a steel pipe column are inserted and bonded on site, and a gap generated between the socket steel pipe and the steel pipe column can absorb errors during manufacturing and construction.

(2) Since a socket steel pipe and a steel pipe column are inserted and joined on site, a joint that requires sufficient quality control for welding can be manufactured at a factory, and the workability is excellent.

(3) In the invention according to claim 3, the round steel pipe main girder and the socket steel pipe are joined at a position penetrating the lower surface of the round steel pipe main girder with respect to the horizontal force at the time of the earthquake in the main girder direction. In addition to the load transmission, the bearing pressure transmission between the socket steel pipe and the concrete filled around the socket steel pipe is also performed, so that it is easy to secure the required strength and rigidity.

(4) Since the filled concrete is completely restrained by the round steel pipe serving as the main girder and the diaphragm arranged in the main girder, the concrete does not shift within the main girder and is sufficient as a bearing member. High strength can be expected.

(5) Further, with respect to the horizontal force at the time of the earthquake in the direction of the steel cross beam, the diaphragm is installed in the main girder of the round steel pipe at the joint position with the steel cross beam to stiffen it. Local destruction at the position is suppressed, and the necessary strength and rigidity can be imparted to the joint.

(6) In the invention according to the fourth aspect, the shear delay phenomenon occurring in the steel pipe portion of the steel cross beam is mitigated by the filling of the concrete, which is advantageous in design stress checking.

(7) In the invention according to claim 5, the height of the steel cross beam is set to 70% or more of the height of the round steel pipe main girder, whereby the tensile stress generated in the flange of the steel cross beam is reduced. When transmitted to the round steel pipe, out-of-plane deformation occurring in the round steel pipe at the steel cross beam mounting position is suppressed, and smooth stress transmission is performed between both members.

(8) In the invention according to the sixth aspect, the round steel pipe main girder is arranged in a well-balanced manner immediately below the track laid on the concrete slab, so that the train load traveling on the track can be efficiently reduced. The bending moment and the shearing force transmitted to the main girder of the round steel pipe and generated in the concrete slab can be reduced.

(9) In the invention according to claims 7 and 8, the phenomenon in which the socket steel pipe comes off from the steel pipe column is suppressed by the slip stopper provided on both steel pipes. Joint deformation is suppressed, which contributes to preventing train derailment and the like.

(10) According to a ninth aspect of the present invention, in a rigid frame type viaduct comprising a steel pipe column, a round steel pipe main girder, and a steel cross girder, a plastic hinge is formed on the steel pipe column when an earthquake load is applied. In addition to providing excellent seismic resistance that depends on the load-carrying capacity of concrete-filled steel pipes, this method also speeds up recovery work by focusing damage during earthquakes on steel pipe columns that can be easily repaired. I can do it.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an invention according to claim 1 (claims 3, 5,
FIG. 6 is a vertical cross-sectional view of a joint between a column and a spar in one embodiment.

FIG. 2 is a plan view corresponding to FIG.

FIG. 3 is a vertical sectional view of a joint between a column and a girder in one embodiment of the invention according to claim 2 of the present application.

FIG. 4 is a vertical sectional view of a joint between a column and a girder according to another embodiment of the invention according to claim 1 of the present application.

FIG. 5 is a vertical sectional view of a joint between a column and a girder according to an embodiment of the invention according to claim 4 of the present application.

FIG. 6 is a vertical sectional view of a joint between a column and a girder according to an embodiment of the present invention according to claim 7 of the present application.

FIG. 7 is a vertical sectional view of a joint between a column and a girder in another embodiment of the invention according to claim 7 of the present application.

FIG. 8 is a vertical sectional view showing a relationship between a joint between a column and a girder and a plastic hinge formed on a steel pipe column when an earthquake load is applied according to an embodiment of the present invention according to claim 9 of the present application. is there.

FIG. 9 is a perspective view showing an example of the entire structure of a three-dimensional rigid-frame railway viaduct using the joint type according to the present invention.

[Explanation of symbols]

1 ... main girder of round steel pipe 2 ... concrete filled steel pipe column 3 ...
Socket steel pipe, 4 ... steel cross beam, 5 ... diaphragm, 6 ... concrete, 7 ... concrete casting hole, 8 ... socket steel pipe top lid, 10 ... concrete floor slab, 11 ... form steel plate,
12 ... concrete, 13 ... track, 14 ... overhang member,
15 ... projection, 16 ... plastic hinge

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Abe 4-5-33 Kitahama, Chuo-ku, Osaka-shi, Osaka Inside Sumitomo Metal Industries, Ltd. (72) Inventor Mamoru Izawa 4-5-Kitahama, Chuo-ku, Osaka, Osaka No. 33 Sumitomo Metal Industries, Ltd. (72) Inventor Yoshihisa Toyama 4-33, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Inventor Nobuyuki Matsumoto 2-chome, Kokubunji, Tokyo No. 8 38 Inside the Railway Technical Research Institute (72) Inventor Kazu Wakui 2-chome, Hikarimachi, Kokubunji-shi, Tokyo (72) Inside the Railway Technical Research Institute (72) Inventor Hiroshi Kawanishi 4 in Konohana-ku, Osaka-shi, Osaka No.3-55, Konoike-gumi Co., Ltd. (72) Inventor Yuichi Sano 4-3-55, Denho, Konohana-ku, Osaka-shi, Osaka

Claims (9)

[Claims] 1. A round steel pipe main girder on which a concrete floor slab on which a track is laid is disposed at an upper part, a steel pipe column filled with concrete, and a steel disposed substantially perpendicularly to the round steel pipe main girder. In the joint structure with the cross beam, while the socket steel pipe having an outer dimension smaller than the inner diameter of the steel pipe column is joined to the round steel pipe main girder so as to penetrate at least the lower surface of the round steel pipe main girder, A joint structure between a column and a girder in a railway viaduct, wherein concrete is filled in the steel tube column and the socket steel tube while the protruding portion of the socket steel tube is inserted into the steel tube column. 2. A round steel pipe main girder on which a concrete floor slab on which a track is laid is disposed at an upper portion, a steel pipe column filled with concrete, and steel disposed substantially perpendicular to the round steel pipe main girder. In the joint structure with the cross beam, a socket steel pipe having an inner dimension larger than the outer diameter of the steel pipe column is joined to the round steel pipe main girder so as to penetrate at least the lower surface of the round steel pipe main girder. A joint structure between a column and a girder in a railway viaduct, wherein concrete is filled in the steel tube column and the socket steel tube while the steel tube column is inserted into the socket steel tube. 3. A round steel pipe main girder is butt-jointed with a horizontal steel girder, a diaphragm is installed inside the round steel pipe main girder at a butt-joining position, and concrete is filled between the diaphragms. The joint structure between a column and a girder in a railway viaduct according to claim 1 or 2, wherein: 4. The steel cross beam is a steel pipe, and concrete is filled inside the steel cross beam and at least in the vicinity of a position where the steel cross beam is attached to the round steel pipe main girder. 3. The joint structure between a pillar and a girder in the railway viaduct according to 3. 5. The steel beam girder according to claim 1, wherein the height of said girder is at least 70% of the height of said round steel pipe main girder.
A joint structure between a column and a girder in the railway viaduct according to 2, 3, or 4. 6. The pillar in a railway viaduct according to claim 1, wherein the round steel pipe main girder is disposed immediately below a track laid on the concrete floor slab. Joint structure with girder. 7. An overhanging member or a projection is provided on an upper end portion or an upper inner surface of the steel pipe column so as to protrude inward,
2. The joint structure between a column and a girder in a railway viaduct according to claim 1, wherein a projecting member or a projection protruding outward is provided at a lower end portion or a lower outer surface of the socket steel pipe. 8. A protruding member or projection protruding inward at a lower end or inner surface of the socket steel pipe, and a protruding member or protrusion protruding outward at an upper end or upper outer surface of the steel pipe column. The joint structure between a column and a girder in a railway viaduct according to claim 2, wherein: 9. A rigid-frame railway viaduct having a joint structure between a column and a girder in the railway viaduct according to any one of claims 1 to 8, wherein the bending strength of the steel pipe column is such that the socket steel pipe and the round shape. It is set to be smaller than the bending strength of the main girder of the steel pipe and the horizontal girder, and when an earthquake load is applied,
A railway viaduct, wherein a plastic hinge is formed on the steel pipe column.