JP2000204652A - Column base part joining structure for steel frame column member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure joining fixing strength of a column base part, and to easily and inexpensively perform construction work by integrally joining the column base part to a footing beam by a fiber reinforced hardening material. SOLUTION: The prescribed length of a column base part 1a of a column 1 is embedded in and joined to underground beams 2. A penetrating reinforcement 7 having both end parts projecting to the side by penetrating through the inside of a column steel pipe 3 in a part between a baseplate 5 and a flange plate 6 is arranged in the column steel pipe 3. The underground beams 2 are arranged in a position where the end part 2a separates by a prescribed dimension from a side surface of the column steel pipe 3 of the column 1, and this end part 2a is placed on a bottom plate 4. To join this column 1 and the underground beams 2, a hardening material 10 is driven and filled between the column steel pipe 3 of the column 1 and the respective underground beams 2 in the joining part. Thus, joining fixing strength is largely enhanced with the simple constitution by joining the column base part of a steel frame column member to a footing beam by a fiber reinforced hardening material to improve earthquake resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a steel column member for joining a column base of a steel column member to a foundation beam.

[0002]

2. Description of the Related Art In general, a steel column member made of an H-shaped steel or a steel pipe, which constitutes a column such as a steel frame structure or a filled steel tube concrete structure, has a structure in which a column base is fixed to a foundation beam.
The wrapping style, embedding style, etc. were used. The root-wrap type is a structure in which the column base of a steel column member is fixed to the upper surface of the foundation beam and the surroundings are solidified with concrete.The embedding type is that the column base of the steel column member is fixed to the foundation beam by a predetermined length. It is a structure to be embedded. In addition, there is also used a form in which a column base is joined to a foundation beam by using a so-called high base or the like.

[0003]

However, the conventional joint structure of a steel column member as described above has the following problems. First, the root-winding type is disadvantageous in terms of earthquake resistance because the joint fixing strength is weaker than that of the embedding type or the like. Also, in the embedded type, at the joint between the column base and the foundation beam, in order to prevent interference with the reinforcing steel constituting the foundation beam, the reinforcing bars of the reinforcement reinforcing the joint of the column base become complicated, or There is a problem that the formwork structure of this joint becomes complicated, and a great deal of work is required. Further, in the case of using a component such as a high base, there is a problem that the cost increases because the component must be purchased. The present invention has been made in view of the above points, and has a column base joint structure of a steel column member capable of ensuring the joint fixing strength of the column base and performing the construction easily and at low cost. The task is to provide

[0004]

The invention according to claim 1 is
A structure of a column base of a steel column member, wherein the column base and the foundation beam are integrally joined via a fiber-reinforced hardening material.

According to a second aspect of the present invention, there is provided the column-base joint structure for a steel column member according to the first aspect, wherein the column-base is inserted below a top surface level of the foundation beam, It is characterized by being embedded with the fiber reinforced hardened material.

As described above, by joining the column base of the steel column member to the foundation beam with the fiber reinforced hardened material, the joint fixing strength can be increased.

[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
A column-base joint structure for a steel column member according to claim 1, wherein a joint portion between the column base and a foundation beam has a penetrating rebar penetrating the column base and both ends extending toward the foundation beam. Is provided.

Thus, the penetrating rebar functions as a shear key for transmitting stress between the column base and the foundation beam.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a column-base joint structure for steel column members according to the present invention. Here, for example, a description will be given using an example in which the column is made of steel pipe-filled concrete.

In FIG. 1, reference numeral 1 denotes a steel pipe-filled concrete column (steel column member), and reference numeral 2 denotes a reinforced concrete underground beam (foundation beam).

As shown in this figure, a column base 1a of a column 1
Has a configuration in which a predetermined length thereof is embedded in the underground beam 2 and joined. For example, a column-shaped steel pipe 3 having a rectangular cross section, which constitutes the column 1, has a base plate 5 abutting on an upper surface of a concrete bottom 4 and a flange plate 6 positioned on the upper surface level of the underground beam 2. Is formed.

Further, the column steel pipe 3 has a base plate 5
A penetrating reinforcing bar 7 penetrating through the inside of the column steel pipe 3 and having both ends protruding laterally is provided in a portion between the column steel pipe 3 and the flange plate 6. These penetrating rebars 7 are arranged along the direction in which the underground beam 2 extends, whereby the mutually perpendicular penetrating rebars 7 are welded to each other. In addition, reinforcing reinforcing bars 8 extending in parallel with the penetrating reinforcing bars 7 are arranged along the outer surface of the column steel pipe 3.

The underground beam 2 is provided such that an end 2 a thereof is located at a position separated from the side surface of the column steel pipe 3 of the column 1 by a predetermined distance, and the end 2 a is mounted on the bottom plate 4. It is a configuration that is placed. And the beam reinforcement 9 is the underground beam 2
Are arranged so as to protrude from the end portion 2a by a predetermined length and overlap with the penetrating reinforcing bar 7 and the reinforcing reinforcing bar 8 for a predetermined length (for example, 10 times or more the diameter of the reinforcing bar).

In order to join the column 1 and the underground beam 2, a hardened material is provided between the outer surface of the column steel pipe 3 of the column 1 and the end 2 a of the under beam 2 in each place. (Fiber reinforced hardening material) 10 is cast and filled. This cured material 10
It is cast and filled on the bottom 4 to the level of the upper surface of the foundation beam 2, and between the underground beams 2, 2 adjacent to each other, in a range inside the straight line L connecting both ends 2 a, 2 a. Has been cast.

As the hardening material 10, fiber reinforced mortar / concrete or the like is preferable.
It is preferred to use steel fiber reinforced ultra high strength mortar / concrete, such as the compact reinforced composite disclosed in 32583. The compact reinforced composite material (also referred to as "CRC") disclosed in the above publication has extremely high strength and rigidity while maintaining very high internal integrity, and is used as a reinforcing object. This is a configuration in which a reinforcing material is embedded in a matrix including a reinforced base matrix. Here, as the reinforcing object, for example, a fibrous material made of glass fiber, polypropylene fiber, carbon fiber, aluminum oxide fiber, ceramic fiber including silicon nitride fiber and silicon carbide fiber, steel fiber, or the like is used. As the base matrix, for example, cement paste, mortar or concrete based on Portland cement or refractory cement is used. Further, as a reinforcing material, a steel reinforcing material for reinforcing concrete including deformed rods, prestressed wires, cables, and the like, a fiber-polymer composite reinforcing material, and the like are used. Of course, it is also possible to adopt a composition (arrangement) in which the compounding ratio of the compact reinforced composite material, the type of fiber used, and the size and type of the aggregate are changed,
Other materials such as fiber-reinforced mortar / concrete and high-strength concrete other than the above-mentioned compact reinforced composite material can be used as the hardened material 10.

When the construction is performed by applying the joint structure of the column base 1a of the column 1 having the above-described configuration, first, the base 4 is formed, then the underground beam 2 is formed, and the column 1 is connected to the base 4 Build on top. At this time, if the penetrating reinforcing bar 7 and the reinforcing reinforcing bar 8 are attached to the column steel pipe 3 in advance, construction can be easily performed. Thereafter, a hardened material 10 is poured into the joint between the column 1 and the underground beam 2. At this time, the ends 2 a, 2 a of the underground beams 2, 2 adjacent to each other are connected on the bottom 4. A formwork may be assembled along the straight line L, and the hardened material 10 may be cast into the inside of the formwork to the level of the underground beam 2.

In the joint structure of the column base 1a of the column 1 described above, the column base 1a is inserted below the upper surface level of the underground beam 2 and buried with the hardened material 10 so that the column 1 The column base 1a and the underground beam 2 are joined via a hardening material 10 in a so-called embedded manner. As a result, compared to the conventional structure using concrete, the joint fixing strength of the column 1 to the underground beam 2 can be greatly increased with a simple configuration, and as a result, the earthquake resistance can be improved. it can. In addition, the construction can be easily performed without complicating the formwork structure of the joint portion, and the above effects can be obtained at low cost because components such as a high base are not used.

Further, since the penetrating reinforcing bar 7 is provided on the column base 1a, the column base 1a functions as a shear key for transmitting stress between the column base 1a and the underground beam 2. Thus, the joint fixing strength of the column base 1a can be effectively improved, and the arrangement of reinforcing bars around the column base 1a can be prevented from becoming complicated, and work efficiency can be improved. . In addition, by integrating the penetrating rebar 7 into the column base 1a in advance, it is possible to further improve construction efficiency.

In the above-described embodiment, the column 1 is made of a concrete filled steel tube. Alternatively, the column 1 may be a box column made of only the steel tube 3 or a steel frame made of H-shaped steel. It is good. In the above-described embodiment, the column base 1a of the column 1 is embedded below the upper surface level of the underground beam 2. However, if the required strength can be ensured by joining with the hardened material 10. It is also possible to adopt a so-called root winding type. Further, a configuration in which a stud dowel or the like is used instead of the penetrating rebar 7 may be adopted. In addition, in the above-described embodiment, the configuration in which the pillar 1 and the four-sided underground beam 2 are joined has been described as an example. However, it is needless to say that the present invention can be similarly applied to a case where the underground beam 2 has only two or three sides. It is.

Other than this, any configuration may be adopted as long as it does not depart from the gist of the present invention, and it is needless to say that the above-mentioned configurations may be appropriately selectively combined. No.

[0021]

As described above, according to the column base joint structure of the steel column member according to the first aspect, the column base portion of the steel column member and the foundation beam are joined by the fiber reinforced hardened material. It has a configuration. According to the column base joint structure of the steel column member according to claim 2, the column base is inserted below the upper surface level of the foundation beam, and is embedded with the fiber reinforced hardened material, that is, It is configured to be buried and connected to the foundation beam. Thus, by joining the column base of the steel column member to the foundation beam with the fiber reinforced hardened material, the joint fixing strength can be greatly increased with a simple configuration, and the earthquake resistance can be improved. In particular, if the embedding type is adopted, further higher strength can be realized. Moreover, the construction can be easily performed without complicating the formwork structure of the joining portion, and the above effects can be obtained at low cost because components such as a high base are not used.

According to the third aspect of the present invention, there is provided a structure in which a penetrating rebar penetrating the column is provided at the joint between the column and the foundation beam. . This penetrating rebar will function as a shear key to transmit stress between the column base and the foundation beam, and can effectively improve the joint fixing strength of the column base, and furthermore, to the periphery of the column base. In this case, it is possible to avoid complication of the arrangement of the reinforcing bars, and to improve work efficiency. In addition, by preliminarily integrating the penetrating rebar with the column base, it is possible to further improve construction efficiency.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view and a plan sectional view showing an embodiment of a column base joint structure of a steel column member according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 column (steel column member) 1a column base 2 underground beam (foundation beam) 7 penetrating rebar 10 hardened material (fiber reinforced hardened material)

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2E125 AA03 AA45 AA75 AA76 AB12 AC16 AC29 AF01 AF04 AF07 AG03 AG12 AG28 AG43 AG57 BA02 BA34 CA83 DA03

Claims (3)

[Claims] 1. A structure of a column base of a steel column member, wherein the column base and a foundation beam are integrally joined via a fiber reinforced hardened material. Column base joint structure. 2. The column base joint structure for a steel column member according to claim 1, wherein the column base is inserted below a top surface level of the foundation beam, and is made of the fiber-reinforced hardened material. A column base joint structure for a steel column member, which is embedded. 3. The column-base joint structure for a steel column member according to claim 1, wherein a joint portion between the column base and the foundation beam penetrates the column base and both ends thereof. Wherein a penetrating rebar extending toward the foundation beam is provided.