JPH08302619A - Joint structure for composite members - Google Patents

Abstract

PURPOSE: To enhance the workability of construction by joining main girders of steel constituting the joining end of a steel structural beam member integrally with the joining end of a ferro-concrete structure beam which extends from the top of a ferro-concrete structure column leg into the main girders. CONSTITUTION: A steel structural beam member 1 consisting of five H-form main girders of steel 4 is installed in such a way as perpendicularly intersecting the ferro-concrete structure column leg 2, and the joining end with the column leg 2 is formed at the intersection with the column leg 2. At the joining ends of the main girders 4, weir plates 6 are installed between adjoining H-steels of the main girders 4, and shear keys 7 such as hole-equipped ribs are installed on the internal surfaces of the main girders 4 and weir plates 6. Concrete is placed in the area bounded by the weir plate 6, two side H-steels of main girders 4, and the bottom 6a, and the joining end of the ferro-concrete structure beam 5 provided as extending from the top of the ferro-concrete structure column leg 2 into the main girders 4, is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure for composite members. It can be used as a joint structure of composite members composed of different kinds of steel structural members and reinforced concrete members in bridges, constructions, elevated structures and the like.

[0002]

2. Description of the Related Art As a joining structure for composite members, Japanese Patent Laid-Open No.
No. 92007 discloses an invention relating to a composite pier. Regarding this composite pier, as described in FIGS. 9 (a) and 9 (b) (FIGS. 1 and 2 of the published patent publication), the pedestal 12 of the pier 11 is made of reinforced concrete, and the main reinforcement of the pedestal 12 is used. 13 is projected from the top end of the pillar 12 as a threaded joint reinforcing bar or a threaded end reinforcing bar, while the cross beam 14 is made of steel, and the pillar main bar 13 is inserted into the steel cross beam 14 to form an upper flange of the steel cross beam 14. It is described that the nut 15a is fastened and fixed on the top of the No. 15 (from the lower right column on page 2 to the second line to the upper left column on page 3 to the fifth from the lower right column of the published patent publication).
line). Thereby, the pedestal 12 and the steel cross beam 14 are integrated, and the composite pier functions with respect to the constant load and the earthquake load.

[0003]

By the way, in the above-mentioned Japanese Patent Laid-Open No. 4-92007, the tensile strength of the main bar protruding from the upper flange 15 of the steel cross beam 14 and the pedestal 12 against constant load and earthquake load. 13 (from the top left column on page 3 of the published patent gazette, from line 9 to line 11).
line). However, as a structure of the steel cross beam 14 in order to counter the tensile force applied to the main bar 13, it is necessary to provide stiffening ribs 16 on the steel cross beam 14, and the structure becomes complicated and large-scale. Further, the steel reinforcing beam insertion hole 17 is provided in the steel cross beam 14 for inserting the main reinforcing bar 13, but this involves a difficult work for its machining and on-site centering.
Not only that, the connection between the steel cross beam 14 and the pier 11
Since it mainly depends on the main bar 13, the bearing stress on the contact surface where the force of the main bar 13 acts on the constant load and the load at the time of earthquake concentrates, and it is not possible to withstand a large proof stress due to the limit of bearing capacity. There will be no. Japanese Patent Laid-Open No. 4-920
The composite bridge pier of No. 07 has a problem when the steel cross beam and the pedestal are separately configured and the two are joined by anchor bolts or PC steel rods. In this regard,
The same applies to the case where the steel beam member 19 and the reinforcing bar-concrete beam member 18 are joined by the anchor bolts 20 as shown in FIG.

In view of the above-mentioned problems of the prior art, an object of the present invention is to directly and integrally integrate a steel structural member and a reinforced concrete structural member while utilizing the original advantages of the steel structural member and the reinforced concrete structural member. Another object of the present invention is to provide a joint structure for a composite member that is combined, has excellent workability, and is advantageous in terms of construction cost.

[0005]

The joint structure of a composite member of the present invention is a joint structure of a composite member in which a steel structural beam member and a reinforced concrete structural beam member are joined, and the joint end of the steel structural beam member is formed. The steel main girder and the joint end of the reinforced concrete structural beam member provided so as to extend inside the steel main girder are directly and integrally joined to each other. Further, the joint structure of the composite member of the present invention is a joint structure of a composite member in which a steel structure beam member and a reinforced concrete structure column base are joined, and a steel main girder forming a joint end of the steel structure beam member, It is configured by directly and integrally joining the joint end of a reinforced concrete structural beam provided so as to extend from the top of the reinforced concrete structural column base into the steel main girder.

In the joining structure of the composite member of the present invention, the joining end of the steel structure beam member, which is one of the components to be joined, is composed of a steel main girder. For the steel main girder, a material having an H-shaped or box-shaped cross section can be used. Also,
The reinforced concrete structural beam member and the reinforced concrete structural column base of the present invention extend into the steel main girder of the steel structural beam member so that force can be sufficiently transmitted to and from the steel main girder at the joint portion of the composite structure. Existing structure. In the section in which the reinforced concrete structural member extends in the steel main girder, the steel main girder and the reinforced concrete structural member overlap and are connected to each other. In the present invention, the fact that the steel main girder and the joint end of the reinforced concrete structure are directly and integrally joined to each other has this meaning. Therefore, when viewed from the side of the reinforced concrete structure, it can be said that the steel main girder of the steel structure beam member is also a reinforced element in the reinforced concrete structure. With such a joint state, in the present invention, the steel structure beam member and the reinforced concrete member are mutually restrained to form a strong and safe composite structure, and a joining method different from that of the conventional anchor bolt in which stress concentration easily occurs can be adopted. . In addition, at the joint end of the steel main girders, a weir plate for placing concrete is provided between the adjacent steel main girders, and inside the formwork structure surrounded by the weir plate and the steel main girders on both sides. Pour concrete into the. In addition to steel, the weir plate is made of the material normally used for formwork. When a mold made of steel or a material having strength is used as the mold, it can be directly used as a part of the element of the composite structure after use. The same applies to the form of the bottom plate arranged at the bottom of the joint.

Further, a squeaker which is joined and projected to a steel main girder is arranged at the interface in contact with the reinforced concrete. This is to increase the adhesive force between the steel main girder and the concrete and to ensure the integral joining of the composite members. Sherkey has perforated ribs,
Or it is Stud Gibel. The perforated ribs not only serve as stiffening ribs, but also have openings to help improve the filling property of concrete. Further, by disposing the main reinforcing bar at the joint end on the side of the reinforced concrete structure at a position closer to the steel plate of the steel structure than the top of the sharkie where the joint protrudes, the joint strength can be further increased. Furthermore, by arranging the hoop reinforcement around the main reinforcement, it not only reinforces the reinforced concrete beam, but also suppresses the steel plate facing the outside through the dowels and effective ribs from spreading to the outside and is extremely strong and reliable. A high joint structure can be provided.

[0008]

In the present invention, the joining structure of the composite member in which the steel structural beam member and the reinforced concrete structural beam member are joined includes a steel main girder forming a joining end of the steel structural beam member, and a steel main girder The joint ends of the reinforced concrete beam members that are provided so as to extend to each other are directly and integrally joined to each other to effectively and firmly transmit the force. Further, in the present invention, a joint structure of a composite member in which a steel structure beam member and a reinforced concrete structure column base are joined is a steel main girder forming a joint end of the steel structure beam member, and a top portion of the reinforced concrete structure column base. And the joint end of the reinforced concrete structural beam provided so as to extend into the steel main girder, are directly and integrally joined in a mutually penetrating state to effectively and firmly transmit the force.

[0009]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 2 shows a steel structure beam member 1 and a reinforced concrete structure column base 2.
The arrangement | positioning of the joining structure of the composite member which joined and is shown. FIG.
2 shows details of the joint structure of the composite member in FIG. The steel structure beam member 1 is composed of a steel main girder 4 in which five H-shaped steels are arranged, and forms a joint end with the reinforced concrete structure column base 2 at an intersection with the reinforced concrete structure column base 2. At the joint end of the steel main girder 4, a dam plate 6 is provided between the H-shaped steels adjacent to each other of the steel main girder 4. Here, the barrier plate 6 is made of steel, and is not removed after the construction and is used as the structural member of the steel main girder 4. A sharkey 7 is attached to the inner surfaces of the steel main girder 4 and the barrier plate 6. On the other hand, concrete is placed in an area partitioned by the dam plate 6, the H-shaped steel of the steel main girders 4 on both sides, and the bottom plate 6a, and extends from the top of the reinforced concrete structure column base 2 into the steel main girder 4. The joint end of the reinforced concrete structural beam 5 thus provided is formed. In this way, a joint structure of a composite member in which the steel structure beam member 1 and the reinforced concrete structure column base 2 are directly and integrally bonded to each other is formed. The sharkkey 7 enhances the integrity with the reinforced concrete beam 5. 10 is floor concrete. In FIG. 3, the H-section steel forming the steel main girder 4 is not continuous in the longitudinal direction in the vicinity of the top of the reinforced concrete structure column base 2 as in FIG. 1, but the H-section steel is discontinuous (4-1 and 4). An example having the structure of -2) will be shown. Other than that, it is the same as the example of FIG.

FIG. 4 shows an example of a joint structure of a composite member in which a steel structure beam member 1 and a reinforced concrete structure beam member 3 are connected. Steel main girder 4 forming the joint end of the steel structure beam member 1
And the joint end of the reinforced concrete structural beam member 3 provided so as to extend into the steel main girder 4 are directly and integrally joined to each other. A dam plate 6 is provided between the H-shaped steels adjacent to each other of the steel main girder 4, and a sharky 7 is attached to the inner surfaces of the steel main girder 4 and the dam plate 6. Concrete is placed in an area partitioned by the barrier plate 6, the H-shaped steel of the steel main girders 4 on both sides, and the bottom plate 6a to form a joint end of the reinforced concrete structural beam member 3.

FIG. 5 shows an example of a joint structure of a composite member in which a steel structure beam member 1 of a box-shaped steel main girder 4 and a rectangular reinforced concrete structure beam member 3 are connected. At the joint portion of the composite member, perforated ribs 7a having an aperture portion 21 as a Sherky are fixedly attached to both side surfaces and the bottom portion of the barrier plate 6 and the steel structure beam member 1. (B) is a cross-sectional view of (A) in the lateral direction, and is arranged at a position closer to the steel plate of the steel main girder 4 than the top portion of the perforated rib 7a where the main rebar 8 is joined and projected to the steel main girder 4. The hoop reinforcement 9 is arranged around the main reinforcement 8. FIG. 6 shows an example of a T-shaped perforated rib 7a.

FIG. 7 shows an example of a joint structure of a composite member in which a steel structure beam member 1 of a steel main girder 4 having a box type structure and a reinforced concrete structure beam member 3 having a rectangular cross section are joined. At the joint portion of the composite member, stud dowels 7b are fixedly attached to both side surfaces and the bottom portion of the barrier plate 6 and the steel structure beam member 1 as a sharkey. (B) is a cross-sectional view of (A) in the lateral direction, in which the main reinforcing bar 8 and the hoop reinforcing bar 9 are arranged around the main reinforcing bar 8. In FIG. 8, the main reinforcing bar 8 is arranged at a position closer to the steel plate of the steel main girder 4 than the top of the stud dowel 7b that is joined and projected to the steel main girder 4, and the hoop reinforcing bar 9 is arranged around the main reinforcing bar 8. The installed state is shown.

[0013]

The present invention has the following effects. The present invention directly and integrally joins a steel main girder forming a joint end of a steel structural beam member and a joint end of a reinforced concrete structural beam member provided so as to extend within the steel main girder. As a result, a strong and safe composite structure can be obtained, and it can withstand constant loads and earthquake loads sufficiently, and smoothly transmit force between steel and reinforced concrete beam members. Can be achieved. The same applies to the joint structure of the composite member in which the steel structure beam member and the reinforced concrete structure column base are joined.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of a joint structure of a composite member in which a steel structure beam member and a reinforced concrete structure column base of the present invention are joined.

FIG. 2 is a diagram showing an arrangement of a composite member of a steel structure beam member and a reinforced concrete structure column base of FIG.

FIG. 3 is a diagram illustrating another embodiment of the joint structure of the composite member in which the steel structure beam member and the reinforced concrete structure column base of the present invention are joined.

FIG. 4 is a diagram illustrating an example of a joint structure of a composite member in which a steel structure beam member and a reinforced concrete structure beam member of the present invention are joined.

FIG. 5 is a diagram illustrating another example of the joint structure of the composite member in which the steel structure beam member and the reinforced concrete structure beam member of the present invention are joined.

FIG. 6 is a diagram illustrating an example of a partial modification of the example of FIG.

FIG. 7 is a diagram illustrating still another embodiment of the joint structure of the composite member in which the steel structure beam member and the reinforced concrete structure beam member of the present invention are joined.

FIG. 8 is a diagram illustrating an example of a partial modification of the example of FIG. 7.

FIG. 9 is a diagram illustrating a conventional technique.

FIG. 10 is a diagram illustrating another conventional technique.

[Explanation of symbols]

 1 Steel Structural Beam Members 2 Reinforced Concrete Structural Column Members 3 Reinforced Concrete Structural Beam Members 4 Steel Main Girders 5 Reinforced Concrete Structural Beams 6 Bars 6a Bottom 7 Sherky 7a Perforated Ribs 7b Stud Gibels 8 Main Reinforcing Bars 9 Hoop Muscles 10 Floor Concrete 11 Bridge Piers 12 Posts 13 Main bars 14 Steel horizontal beams 15 Upper flange 16 Stiffening ribs 17 Reinforcing bar insertion holes 18 Reinforced concrete beam members 19 Steel beam members 20 Anchor bolts 21 Openings

Claims (7)

[Claims] 1. In a joint structure of a composite member in which a steel structural beam member and a reinforced concrete structural beam member are joined, a steel main girder forming a joint end of the steel structural beam member and extending into the steel main girder. A joint structure for a composite member, characterized in that a joint end of a reinforced concrete beam member provided so as to exist is directly and integrally joined to each other. 2. In a joint structure of a composite member in which a steel structure beam member and a reinforced concrete structure column base are connected, a steel main girder forming a joint end of the steel structure beam member and a top portion of the reinforced concrete structure column base A joint structure for a composite member, characterized in that the joint end of a reinforced concrete structural beam provided so as to extend within the steel main girder is directly and integrally joined to each other. 3. A weir plate for placing concrete is provided between the steel main girders at the joint end of the steel main girders, and the form frame structure is surrounded by the weir plate and the steel main girders on both sides. The joint structure of a composite member according to claim 1 or 2, wherein the joint end of the composite member on the side of the reinforced concrete structure is formed by the cast reinforced concrete. 4. The joining structure for a composite member according to claim 1, wherein a squeeze which is joined and protruded to a steel main girder is arranged at an interface in contact with the reinforced concrete. 5. The joint structure for a composite member according to claim 4, wherein the sharkey is a perforated rib or a stud dowel. 6. The method according to claim 4 or 5, wherein the main reinforcing bar at the joint end on the side of the reinforced concrete structure is arranged at a position closer to the steel plate of the steel main girder than the top of the sharkey protruding from the joint of the steel main girder. Joint structure of composite members. 7. The joint structure for a composite member according to claim 6, wherein a hoop bar is arranged around the main reinforcing bar.