JP3052102B2 - Construction method of building drive using joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a building drive using a joint structure, and more particularly to a concrete steel column filled with concrete in a steel column built at a predetermined position. The present invention relates to a method for constructing a building drive body in which a connection member is connected to an upper end of a pillar.

[0002]

[Prior art]

(1) Precast reinforced concrete pillars are manufactured,
Produce precast reinforced concrete beams, build multiple columns in place, place the ends of the beams on top of each column,
A beam is hung between the upper ends of the columns, and the reinforcing bars at the upper ends of the columns and the reinforcing members at the ends of the beams are placed in a predetermined positional relationship. (2) A pair of pillars and a beam connecting them are integrally formed by precast reinforced concrete to form a beam-column body, and a precast reinforced concrete structure. In the manufacture of a single beam, the column and beam body is erected at a predetermined position, the single beam is arranged at a place where there is no beam between the column and beam, and the single beam is connected by an appropriate coupling means. (3) As shown in FIGS. 25 and 26, a short H-shaped steel frame 2a, which is the same as a steel beam, is crossed and integrally connected to form a cross-shaped steel frame 2A. Then, an L-shaped formwork plate 2b is arranged around a portion from the center of the cross steel frame 2A. The edge of each of the formwork and plate 2b is welded to the H-shaped steel frame 2a, and the four formwork and formplates 2b are used to form a square formwork and cylinder 2B. The outer portion of the short H-section steel 2a is used as the beam attachment portion 2a1 to form the joint structure 2, and the plurality of column main reinforcements 1a and 1a1 of the reinforced concrete column 1 are used as the formwork cylinder of the joint structure 2. Through a vertical hole drilled inside the body 2B and the flange of the H-shaped steel frame 2a,
Are fixed to the formwork cylinder 2B, and the column main bars 1a, 1a1 and the band bars 1b are surrounded by the formwork,
Concrete is cast into the mold / tubing body 2B and into the mold to form the column 1 and the connection portion, and the connection structure 2 is buried in the concrete portion of the connection portion of the column 1, A steel beam is attached to the short H-shaped steel beam attachment portion 2a1 of the mouth structure 2. (4) As shown in FIGS. 27 and 28, the flange of the short H-shaped steel frame 3a is connected to a triangular horizontal member. The stiffener 3a1 is cut away, and the steel frames 3a are crossed and joined together to form a cross steel frame 3A. A square formwork cylinder 3B is arranged around the cross steel frame 3A. An end portion of each steel frame 3a of the steel frame 3A is welded to the formwork cylinder 3B, and a beam mounting body 3C is welded to the outside of the formwork cylinder 3B to form the joint structure 3. The plurality of pillar main bars 1a are passed through the inside of the formwork and cylindrical body 3B of the connection structure 3, and the pillar main bars 1a are formed. The frame 1 is surrounded by a formwork, and concrete is poured into the formwork cylindrical body 3B and into the formwork to form the column 1 and the connection portion, and the concrete is passed through the plurality of column main bars 1a. There is a type in which the mouth structure 3 is buried in the concrete portion of the connection portion of the column 1 and the steel beam 4 is attached to the beam attachment 3C of the connection structure 3.

[0003]

The above (1) has the following problems.
Highly-advanced work is required to bridge the beam between the upper ends of the columns and to surround the reinforcing bars at the ends of the columns with formwork, etc. so that the reinforcing bars at the upper ends of the columns and the beams at the ends of the beams have a predetermined positional relationship. There is a drawback that requires skill, and in the case of the above (2), the work of enclosing the periphery of the reinforcing bar of the connection with the formwork becomes easy, but the precast reinforced concrete column-beam body becomes very heavy, and the transportation and There are disadvantages that the lifting is troublesome and requires heavy equipment. In the case of (3) and (4), the portions of the cross steel frames 2A and 3A formed of the steel frames 2a and 3a of the connection members 2 and 3 are buried in the concrete portion of the connection portion.
Although the vertical force acting on the connection members 2 and 3 can be transmitted to the reinforced concrete columns 1 well, the upper and lower columns 1 of the connection members 2 and 3 are made of reinforced concrete. Cannot be transmitted to the column 1 properly, and an unreasonable force acts on the joint between the joint members 2 and 3 and the reinforced concrete column 1, and this portion may be damaged. The problem to be solved by the present invention is to provide a method of constructing a building drive using a connection structure which does not have the drawbacks of the above (1) to (4), in other words, to provide a method for constructing a pillar. The acting axial force can be reliably transmitted to the concrete in the column steel frame, the moment acting on the joint can be accurately distributed to the column steel frame, and the connection structure and the column steel frame can be unitized, and their transportation and lifting can be performed. It is an object of the present invention to provide a method of constructing a building frame using a connection member which is easy to work and does not require a high level of construction work on site.

[0004]

The present invention adopts the following constitution in order to solve the above-mentioned problems. In the configuration of the present invention, concrete is filled in a short column steel frame having a closed cross section in which a stiffener is fixed inside and a beam mounting body is fixed outside, and a plurality of concrete portions in the short column steel frame are filled with concrete. A through-hole is formed in the vertical direction to form a connection structure, the long column steel frame is formed of the same closed section steel frame as the short column steel frame, and a long column steel frame is built at the column formation position of the lower gantry. The lower part of the connecting steel rod is vertically extended and disposed in the long column steel frame, concrete is filled in the long column steel frame, the long column steel frame is made into a filled concrete steel column, and the long column steel bar projects upward from the long column steel frame. Pass the upper part of the connecting steel rod through the through hole of the connecting member, place the connecting member on the filled concrete steel column, pull the upper end of the connecting steel bar to introduce tensile force to the connecting steel bar, Hold the tensile force introduced into the The end face of the concrete part of the connection structure and the end face of the concrete part of the filled concrete steel column are pressed against each other, and the lower end of the short column steel frame and the upper end of the long column steel frame of the connection structure are joined by welding. The present invention is directed to a method of constructing a building drive using a connection structure. In a preferred embodiment, in the joint structure, a beam attachment body is fixed outside a short column steel frame having a closed section, and a stiffener is fixed inside the short column steel frame corresponding to the beam attachment body,
The inside of the short column steel frame is filled with concrete, and a convex portion or a concave portion is formed in the center of the lower portion of the concrete portion, and a concave portion or a convex portion is also formed in the center of the upper portion of the concrete portion as necessary. Further, a through hole extending in the vertical direction is formed in a concrete portion in the short column steel frame. And as a stiffener, a horizontal stiffener,
A vertical stiffener, or a horizontal stiffener and a vertical stiffener, are provided by means of which the axial forces acting on the closed section column steel can be transmitted to the concrete part in the column steel. As the beam attachment body of the connection member, for example, an H-shaped steel beam having the same beam structure as that of the steel beam, which is cut short, or a gusset made of a steel plate having a width smaller than that of the beam beam of the steel beam is used. However, in a preferred embodiment,
A plurality of short H-shaped steels are cross-linked into a cruciform (or T-shape) to form a cruciform (or T-shape) steel frame, and a portion near the intersection of the cruciform (or T-shape) steel frame is stiffened. A short column steel frame is formed so that a portion of the cross-shaped (or T-shaped) steel frame away from the intersection is a beam attachment portion.

[0005] The long column steel frame is formed, for example, by cutting a steel frame having a closed cross section having the same shape as the cross section shape of the short column steel frame of the connection structure into a predetermined length. Providing appropriate connecting means at the lower end of the long column steel frame facilitates the work of building the long column steel frame. As connecting means, for example, a plurality of gussets are welded to the outer periphery of the lower part of the long columnar steel frame. The connecting steel bar has a lower portion embedded in the concrete in the long column steel frame and an upper portion projecting from the upper end of the long column steel frame. As the connecting steel bar, for example, a PC steel bar is used. An anchor is fixed to the lower end of the lower part of the connecting steel bar, and the lower part of the connecting steel bar is arranged in the column steel so that the anchor is located in the middle of the long steel column. Reduce the anchoring length for concrete parts. Also,
The upper part of the connecting steel bar located in the column steel frame may be covered with a sheath, and only the lower part may be fixed by the filled concrete. Furthermore, the lower end of the connecting steel bar located in the column steel frame via appropriate connecting means,
You may make it couple | bond with the rebar of a lower vehicle body, etc. Concrete is filled into a long pillar steel frame built at the column formation position of the lower frame to make a filled concrete steel column. In a preferred embodiment, a recess or projection is formed in the center of the top of the concrete part. This recess or protrusion is
A shape conforming to the central convex portion or concave portion at the lower portion of the concrete portion of the connection structure. An octagon, a quadrangle, a circle, or the like is used as the shape of the closed section of the long column steel frame and the short column steel frame. When a square or circular shape is used as the closed cross-sectional shape, the long column steel frame is formed by cutting a ready-made square steel pipe or steel pipe to a predetermined length.

[0006] The introduction of the tensile force to the connecting steel bar may be performed before the temporary attachment of the beam steel frame to the beam attachment body of the connection member,
This may be performed after the beam steel frame is temporarily attached to the beam attachment body. A tensile force is introduced into the connecting steel bar, and the tensile force is held by an appropriate holding means, so that the end face of the concrete portion of the joint structure and the end face of the concrete portion of the filled concrete steel column are pressed against each other.
The long column steel frame of the filled concrete steel column and the short column steel frame of the connection structure are joined as follows. The connection structure is placed on the filled concrete steel column formed at the column forming position of the lower vehicle body, and the protrusion or the recess at the lower end of the connection structure is fitted into the recess or the protrusion at the upper end of the steel column. . With no axial force acting on the short column steel frame and the long column steel frame, tensile force is introduced into the connecting rebar, and the end face of the concrete part of the joint structure and the end face of the concrete part of the filled concrete steel column are mutually connected. In the pressed state, the upper end of the long column steel frame of the filled concrete steel column and the lower end of the short column steel frame of the connection structure are joined by welding. In this way, the long column steel and the short column steel can be joined by welding while supporting the vertical load acting on the filled concrete steel column with the filled concrete, so that each column steel is compressed. Joining can be performed without force.
In addition, since the welded portion contracts due to cooling after welding, the joint portion of each column steel frame is brought into a state where a contraction force acts. In order to prevent an axial compressive force from acting on the short and long column steel members when the end face of the concrete part of the connection member and the filled concrete steel column is pressed, for example, the connection member or the filled concrete The connection structure and the filled concrete steel column are formed such that the lower or upper surface of the concrete portion of the steel column projects slightly from the lower or upper surface of the short or long column steel. And when the end faces of the concrete part are pressed against each other,
A gap suitable for welding is formed between the end face of the short column steel frame and the end face of the long column steel frame. It is also possible to fix the beams of the pair of connection members to the beam attachment bodies, and to place the joints in a sag shape on a pair of filled concrete steel columns. As the beam to be attached to the beam attachment body of the connection member, for example, a steel beam or a steel reinforced concrete beam having a steel portion exposed at an end is used. According to the present invention, the connection structure can be unitized and manufactured at the factory, and a long column steel frame can be unitized and manufactured at the factory.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 will be described with reference to FIGS. The connection structure 10 includes a short steel column 11, a cross-shaped steel frame 12, a concrete portion 14, and the like. The cross-shaped steel frame 12 crosses the short steel frame 12A in a cross,
The intersections are integrally formed by welding or the like. The short steel frame 12A is formed by cutting an H-shaped steel having the same structure as that of the beam steel frame into a predetermined length, and cutting off the protruding portions of the upper and lower flanges at the portion beyond the intersection into a trapezoidal shape. As shown in FIGS. 3 and 4, the columnar plate 11A is formed by bending a rectangular steel plate into a shape obtained by equally dividing an octagonal cylinder into four parts by a line passing through the center and the center of two opposing sides thereof. , H-beam short steel frame 12A
A concave portion 11A1 having a shape obtained by bisecting the cross section of the web with a line passing through the center of the web is formed on the side in the longitudinal direction.
The column base plate 11A is arranged between the steel frames 12A of the cross-shaped steel frame 12, the recesses 11A1 of the column base plate 11A are applied to the flanges and the web surface of the steel frame 12A, and the column base plate 11A is welded to the steel frame 12A. The upper and lower portions 11A2 of the longitudinal edge of the plate 11A are welded to each other to form four columnar plates 1
A short column steel frame 11 having an octagonal closed cross section is formed at 1A, and the steel frame portion 10A of the joint structure 10 is formed. As shown in FIG. 12, the upper and lower end surfaces of the short columnar steel frame 11 are inclined surfaces 11a, and four gussets 11b are welded to the outside of the upper end of the columnar steel frame 11. The upper and lower triangular flange portions of the cross-shaped steel frame 12 located inside the short column steel frame 11 become horizontal stiffeners 12a, and the web portions become vertical stiffeners 12b. The portion of the cross-shaped steel frame 12 located outside the short column steel frame 11 becomes the beam mounting portion 12c.

The lower end of the short columnar steel frame 11 of the steel frame portion 10A of the connection member 10 is placed on the lower mold body having an octagonal concave portion, and the octagonal short columnar convex portion is placed at the lower center. The upper mold provided is mounted on the short column steel frame 11, a middle rod for forming a through hole is arranged at a predetermined position between the lower and upper molds, and the short columnar projections and columns of the upper mold are provided. Concrete is filled into the short column steel frame 11 and the gap through the gap between the upper end of the steel frame 11 and the gap, and an octagonal concave portion 14 is formed at the upper end.
5 and 6 having a concrete portion 14 having an octagonal convex portion 14b at the lower end and a longitudinal through hole 14c at four locations. In addition, as clearly shown in FIG.
The upper end surface around the concave portion 14a and the lower end surface around the convex portion 14b are slightly protruded from the upper end surface 11a and the lower end surface 11b of the short columnar steel frame 11. As shown in FIGS. 7 to 12, the filled concrete steel column 20 is a long column steel frame 2.
1, a concrete portion 22, and a connecting steel bar 23 arranged in the longitudinal direction of a long columnar steel frame 21 and the like. The long column steel frame 21 cuts a steel octagonal closed-section pipe body to a length shorter than the floor height, and as shown in FIG.
An inclined surface 21a is formed by welding four gussets 21b to the outside of the lower end. The connecting steel bar 23 is a normal PC
When the steel rod is set to a predetermined length (that is,
0, which is slightly larger than the sum of the length of the short column steel frame 11) and a metal piece 23a at its lower end as shown in FIG.
Are formed by welding.

Next, a description will be given of a construction method for constructing a building frame using the connection member 10 and the long columnar steel frame 21. As shown in FIGS. 7 and 8, a short tubular body 25 having an octagonal closed cross section is fixed to the column forming position of the lower body, and concrete 26 is filled in the tubular body 25, and the outside of the tubular body 25 is filled. The four gussets 25a are welded. A long column steel frame 21 is built on the lower body tube 25, and a gusset 25a at the upper end of the tube 25 and a gusset 21b at the lower end of the long column steel frame 21 are connected using a connection plate. A mold M having a short octagonal columnar projection is placed on the upper end of a long column steel frame 21, and a connecting iron bar 23 is inserted into a through hole of the mold 4.
, And a lower portion thereof extends vertically into the column steel frame 21. Concrete is poured into the column steel frame 21 and into the gap through the gap between the octagonal columnar convex portion of the mold body M and the upper end of the column steel frame 21, and the concrete is poured into the upper end as shown in FIGS. There is a square recess 22a and four connecting steel bars 23
Concrete part 2 with lower part embedded in place
2 to form a filled concrete steel column 20. In order to simplify the work, the recess 2 of the concrete part 22
Although the upper end surface around 2 a is flush with the upper end of the column steel frame 21, the upper end surface around the concave portion 22 a of the concrete portion 22 may be slightly protruded from the upper end of the long steel column 21.

The connection member 10 is lifted by an appropriate lifting means, and the through hole 14c of the connection member 10 is fitted into the upper part of the connecting steel bar 23 projecting above the filled concrete steel column 20. , Hanging the connection structure 10,
As shown in FIG. 11 and FIG.
The rectangular convex portion 14b is fitted into the octagonal concave portion 22a of the filled concrete steel column 20. Next, a washer w is fitted to each connecting steel bar 23 projecting each of the connection members 10 into the recess 14a at the upper end, and a nut n is screwed into a threaded portion of the connecting steel bar 23. Pull it with a jack,
A tensile force (prestress) is introduced into the connecting steel bar 23, the nut n is tightened, the introduced tensile force is maintained, and the connection structure 10 and the column 20 are firmly connected. Then, a steel beam 30 is arranged between the plurality of filled concrete steel columns 20,
The end of the steel beam 30 is connected to the beam mounting portion 12c of the connection structure 10.
Then, mounting (or temporary mounting) is performed using a siding plate, bolts and nuts, and the like. The operation of introducing a tensile force to the connecting steel bar 23 and maintaining the tensile force may be performed when the steel beam 30 is attached (or temporarily attached). In a similar manner, FIG.
As shown in FIG. 2, the short column steel frame 1 of the lower connection structure 10
At the upper end of 1, build a long pillar steel frame 20 on the upper floor,
The gusset 11b at the upper end of 1 and the gusset 21b at the lower end of the long column steel frame 21 are connected using a connecting plate. Similarly, the mold is placed on the upper end of the long steel column 21, the connecting iron bar is passed through the through hole of the mold, concrete is filled in the column steel 21 and the like, and a filled concrete steel column similar to the above is formed. . Similarly, the connection structure 10 is placed on the filled concrete steel column, the upper end of the connecting steel bar is pulled with a jack, a tensile force is introduced into the connecting steel bar, and the introduced tensile force is applied by an appropriate means. By holding, the connection structure and the filled concrete steel column are firmly connected. In the same manner, the connection structure on the upper floor, the filled concrete steel columns and the steel beams are further assembled to construct a high-rise building frame.

The manner of joining the upper end of the long column steel frame 21 of the filled concrete steel column 20 and the lower end of the short column steel frame 11 of the connection structure 10 is performed as follows. As shown in FIG. 12, when the end surface around the convex portion 14b of the concrete portion of the joint structure 10 and the end surface around the concave portion 22a of the concrete portion of the filled concrete steel column 20 are pressed against each other, a short steel column A gap g suitable for welding is formed between the lower inclined end surface 11a of the lower column 11 and the upper inclined end surface 21a of the long columnar steel frame 31. In this state, the concrete portion 14 and the steel column 20
Since the skeleton load is supported by the concrete portion 22 of FIG. 2 and no axial compressive force acts on the short columnar steel frame 11 and the long columnar steel frame 21, the gap g is filled with molten welded steel, so that the short columnar steel frame 11 and Long column steel frame 2
1 without a compressive force in the axial direction,
1 and the upper end of the long column steel frame 21 can be joined. Since the lower part of the connection structure 10 and the upper part of the filled concrete steel column 20 are strongly pressed by the connecting steel bar 23 into which the tensile force is introduced, the concrete portion of the connection structure 10 and the concrete of the filled concrete steel column 20 are pressed. At the stage where the load due to the weight of the upper frame does not sufficiently act on the press contact surface with the portion, welding can be performed.

Also, the joint between the lower end of the long column steel frame 21 of the filled concrete steel column 20 and the upper end of the short column steel frame 11 of the connection structure 10 is made by connecting the upper end of the long column steel frame 21 to the connection structure 1.
0 can be performed in the same manner as the method of joining with the lower end of the short steel column 11. For example, as shown in FIG. 12, the upper end surface around the concave portion 14 a at the upper part of the concrete portion of the joint structure 10 is slightly protruded from the upper end surface of the short pillar steel frame 11 of the joint structure 10, and the protruded concrete is formed. The lower end of the long column steel frame 21 on the upper floor is fitted into the portion, so that a gap g suitable for welding is formed between the upper end surface 11a of the short column steel frame 11 and the lower end surface 21a of the long column steel frame 21, Short column steel frame 1
The gusset 11b at the upper end of 1 and the gusset 21b at the lower end of the long column steel frame 21 are connected by a connecting plate. Then, concrete is filled in the long column steel frame 21 on the upper floor, and the concrete in the long column steel frame 21 on the upper floor and the concrete in the short column steel frame 20 of the connection structure 10 are joined. Then, after the weight of the building drive on the upper floor or the like sufficiently acts on the filled concrete steel column 20, the connection between the upper end of the short column steel frame 11 and the lower end of the long column steel frame 21 by the connecting plate is released, With the building load supported by the concrete in the filled concrete steel column 20, the gap g is filled with molten welding steel, and the upper end of the short column steel frame 11 and the lower end of the long column steel frame 21 are integrally joined. If it is necessary to protect the concrete from heat during welding, the column steel
A heat insulating material or the like is embedded in concrete portions in the column steel frames 11 and 21 corresponding to the inner peripheral surfaces of the end portions of the first and second ends. According to the construction method of the building driving body of the first embodiment, the long column steel frame 21 of the filled concrete steel column 20 and the connection structure are formed in a state where no axial compressive force acts on the short column steel frame 11 and the long column steel frame 21. 1
Since the short column steel frame 11 can be joined by welding, even if a large load acts on the building frame after the building is completed, there is no possibility that the column steel frame composed of the short column steel frame 11 and the long column steel frame 21 will buckle. Since the axial load burden ratio of the concrete in the filled concrete steel column 20 increases, the wall thickness of the short column steel frame 11 and the long column steel frame 21 having the closed cross section can be reduced.

Embodiment 2 shown in FIG. 13 and FIG. 14 removes the upper and lower triangular flange portions of the steel frame 12A located inside the short steel column 11 of the connection structure 10 of Embodiment 1. This is an example in which a portion serving as a horizontal stiffener 12a is eliminated, and a portion serving as a vertical stiffener 12b is constituted by a web of a steel frame 12A and a flange portion left with the same width as the web. Other configurations and the like of the connection structure 10 are the same as those of the first embodiment. In Example 3 shown in FIGS. 15 and 16, as a column base plate 11A, a rectangular steel plate was bent into a shape obtained by dividing a cylinder into four by a line passing through the center thereof, and the cross section of a short steel frame 3A of an H-section steel was formed. This is an example in which a short columnar steel frame 11 of a connection structure 10 is formed into a cylindrical shape by using a recess having a shape bisected by a line passing through the center of the web and formed on a side in the longitudinal direction. The configuration of the cross-shaped steel frame 12, the concrete portion 14, and the like constituting the connection structure 10 is substantially the same as that of the first embodiment.
However, the long column steel frame is formed by cutting an existing steel pipe having the same diameter as that of the short column steel frame 11 into a predetermined length, and the concave portion 14a, the convex portion 14b of the joint structure 10 and the filled concrete steel column 20 are formed.
Is formed in a circular shape in plan view. FIG.
In Example 4 shown in FIG. 18 and FIG.
A rectangular steel plate is bent into a shape (L-shape) obtained by dividing a rectangular cylinder into four parts by a line passing through the center and the center of each side, and the transverse section of a short steel frame 3A of H-section steel is formed on the longitudinal side thereof. This is an example in which a short column steel frame 11 of the joint structure 10 is formed in a square cylindrical shape using a concave portion having a shape bisected by a line passing through the center of the square. The configuration of the cross-shaped steel frame 12, the concrete portion 14, and the like of the connection structure 10 is substantially the same as that of the first embodiment. However, the long column steel frame is formed by cutting an existing square steel pipe having the same shape as that of the short column steel frame 11 to a predetermined length, and the concave portion 14a, the convex portion 14b of the connection structure 10 and the filled concrete steel column 20 are formed.
Is formed in a quadrangular shape in a plan view.

In Embodiment 5 shown in FIGS. 19 and 20, a cross-shaped steel frame 12 is formed into short steel frames 12A1 and 12A2 by cutting an H-section steel having the same shape as a steel beam into predetermined lengths, respectively. This is an example in which the crosses are crossed and the crossed portions are integrally connected by welding or the like. Short steel frames 12A1, 1 located inside the short column steel frame 11 of the connection structure 10
The flange of 2A2 becomes the horizontal stiffener 12a, and its web becomes the vertical stiffener 12b. Connection structure 10
Other configurations are the same as those of the first embodiment. The sixth embodiment shown in FIGS. 21 and 22 is an example in which the same steel column as the third embodiment is used as the short steel column 11 and the same cross-shaped steel frame 12 as the fifth embodiment is used. The configuration other than the steel frame 12 is the same as that of the third embodiment. Example 7 shown in FIGS. 23 and 24 is an example in which the same steel column 11 as in Example 4 is used as the short steel column 11 and the same as Example 5 as the cross-shaped steel frame 12. The configuration other than the steel frame 12 is the same as that of the fourth embodiment.

[0015]

The present invention has the following effects (a) to (g) by providing the structure described in the claims. (A) According to the first aspect, the moment acting on the joint can be accurately distributed to the column steel consisting of the short column steel and the long column steel, and the axial force acting on the column steel can be divided into the joint. Through the body stiffener, it can be reliably transmitted to the concrete inside the column steel frame. In addition, the connection structure and the long column steel frame can be easily unitized, and the lower part of the short column steel structure of the connection structure and the long column steel frame of the filled concrete steel column can be easily assembled without waiting for the construction of the upper building frame. The upper end can be joined by welding. (B) According to the second aspect of the present invention, the lower end of the concrete portion of the joint structure and the upper end of the concrete portion of the filled concrete steel column can be connected by fitting the concave portion and the convex portion. The force acting on the part can be transmitted reliably. In addition, when the lower part of the connection structure is placed on a filled concrete steel column, their positional relationship is regulated by the fitting of the concave and convex parts, so that the placing work and the erection work are easy. In other words, it is possible to prevent the connection member from falling down after being built. (C) According to the third aspect, a state in which no axial force acts on the short column steel frame and the long column steel frame, that is, a state in which the body load is supported only by the concrete portion of the joint structure and the filled concrete steel column. As a result, since the short column steel structure of the connection structure and the long column steel structure of the column structure can be joined by welding, a large load acts on the building frame consisting of the connection structure and the filled concrete steel column after the completion of the building. However, a steel column formed by joining a long column steel frame and a short column steel frame does not buckle. (D) According to the fourth aspect, the connecting rebar can be shortened. (E) According to the fifth aspect, prestress can be introduced also into the concrete portion of the filled concrete steel column, and the lower end surface of the joint structure and the upper end surface of the filled concrete steel column are strongly pressed against each other. can do. (F) According to the sixth and seventh aspects, the joint structure can be easily unitized, and the joining work between the cast-in-place filled concrete steel column and the joint structure does not require a high level of skill. It can be done easily and reliably. (G) According to the present invention, a joint structure, a long column steel frame and the like can be easily unitized, and the joint structure can be easily connected to a filled concrete steel column cast in place, so that transportation and lifting are easy. Also, construction on site does not require a high level of skill.

[Brief description of the drawings]

FIG. 1 is a sectional view of a steel frame portion of a connection structure according to a first embodiment shown in FIG.
Front view taken in section along line A and viewed in the direction of the arrow

FIG. 2 is a plan view of the one in FIG.

FIG. 3 is a plan view of a column base plate used for manufacturing a short steel column having a connection structure of Example 1 taken along the line AA in FIG. 4;

FIG. 4 is a front view of the one in FIG. 3;

FIG. 5 is a front view of the connection structure of Example 1 taken along line BB in FIG. 6 and viewed in the direction of the arrow;

FIG. 6 is a plan view of the one shown in FIG. 5;

FIG. 7 is a front view of a state in which the long column steel frame of the first embodiment is built, and a formwork is mounted on the upper end thereof, taken along line CC in FIG.

FIG. 8 is a plan view of the one in FIG. 7;

FIG. 9 is a front view of a state in which concrete is filled in the long column steel frame of Example 1 and then the formwork is removed, taken along line CC of FIG. 10 and viewed in the direction of arrows.

FIG. 10 is a plan view of FIG. 9;

FIG. 11 is a front view of the filled concrete steel column and the joint structure of the first embodiment, taken along the same line as the line CC of FIG. 10 and viewed in the same arrow direction.

FIG. 12 is an enlarged front view showing a main part and the like in FIG. 11;

FIG. 13 is a front view of a steel frame portion of the connection structure according to the second embodiment taken along line AA of FIG. 14 and viewed in the direction of the arrow;

FIG. 14 is a plan view of the one in FIG.

FIG. 15 is a front view of a steel frame part of the connection structure according to the third embodiment taken along line AA of FIG. 16 and viewed in the direction of the arrow;

FIG. 16 is a plan view of the one in FIG.

FIG. 17 is a front view of a steel frame part of the connection structure according to the fourth embodiment taken along line AA of FIG. 18 and viewed in a direction indicated by an arrow;

FIG. 18 is a plan view of the one in FIG. 17;

FIG. 19 is a front view of the steel frame part of the connection structure of the fifth embodiment taken along line AA of FIG. 20 and viewed in the direction of the arrow;

FIG. 20 is a plan view of that of FIG. 19;

FIG. 21 is a front view of a steel frame portion of the connection structure according to the sixth embodiment taken along line AA of FIG. 22 and viewed in the direction of the arrow;

FIG. 22 is a plan view of the one shown in FIG. 21;

FIG. 23 is a front view of the steel frame part of the connection structure according to the seventh embodiment taken along line AA of FIG. 24 and viewed in the direction of the arrow;

FIG. 24 is a plan view of that of FIG. 23;

FIG. 25 is a perspective view showing a conventional joint structure and reinforcing bars.

FIG. 26 is a plan view of FIG. 25;

FIG. 27 is a diagram showing another conventional connection structure and reinforcing steel used in FIG.
Front view in cross section along line D and viewed in the direction of the arrow

FIG. 28 is a plan view of the one in FIG. 27;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Connection structure 10A Steel part of connection structure 11 Short column steel frame 11A Column base plate 12 Cross-shaped steel frame 12A Short steel frame 12A1 Short steel frame 12A2 Short steel frame 12a Horizontal stiffener 12b Vertical stiffener 12c Beam mounting body 14a Concrete portion 14a 14b Convex part 14c Through hole 20 Filled concrete steel column 21 Long column steel frame 22 Concrete part 23 Connected steel rod 25 Lower body pipe g Clearance n Nut w Washer

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 1/30 E04B 1/16 E04B 1/22 E04C 3/00-3/46

Claims (7)

(57) [Claims] A concrete structure is filled in a short column steel frame having a closed section having a stiffener fixed on the inner side and a beam mounting member fixed on the outer side, and a plurality of penetrations are formed in the concrete portion in the short column. A hole is formed in the vertical direction to form a connection structure, a long column steel frame is formed of the same closed section steel frame as the short column steel frame, and a long column steel frame is built at the column formation position of the lower vehicle The lower portion of the connecting steel bar is vertically extended in the long column steel frame, and the concrete is filled in the long column steel frame, and the long column steel frame is used as a filled concrete steel column, and the connection projecting upward from the long column steel frame. Pass the upper part of the steel rod through the through hole of the connection structure, place the connection structure on the filled concrete steel column, pull the upper end of the connection steel bar, introduce the tensile force to the connection steel bar, and connect The tensile force introduced to the steel rod is held by appropriate holding means. Then, the end face of the concrete part of the connection structure and the end face of the concrete part of the filled concrete steel column are pressed against each other, and the lower end of the short column steel frame of the connection structure and the upper end of the long column steel frame are joined by welding. A method of constructing a building drive using a connection structure characterized by the following. 2. A concrete structure is filled in a short column steel frame having a closed cross section having a stiffener fixed on the inside and a beam mounting member fixed on the outside, and a plurality of penetrations are made in the concrete portion in the short column steel. A hole is formed in the vertical direction, and a convex or concave portion is provided in the center of the lower part of the concrete part to form a joint structure, a long column steel frame is formed of the same closed section steel frame as the short column steel frame, A long column steel frame is built at the column formation position of the gantry, the lower part of the plurality of connecting steel bars is extended vertically into the long column steel frame, and the upper part is arranged so as to protrude above the long steel column. Concrete is filled in the column steel frame, a concave or convex portion is provided at the center of the upper part of the concrete portion to form a filled concrete steel column, and the filled concrete steel column is passed through the through hole of the connection structure at the upper part of the connecting steel bar. on top of Place the mouth structure, pull the upper end of the connecting steel bar to introduce a tensile force to the connecting steel bar, hold the tensile force introduced to the connecting steel bar by appropriate holding means, and hold the end face of the concrete portion of the joint structure. And a concrete part of the filled concrete steel column is pressed against each other, and the lower end of the short column steel and the upper end of the long column steel of the connection are welded to each other. How to build a carpenter. 3. A state in which the joint structure is placed on the filled concrete steel column, and the lower end face of the concrete portion of the joint structure and the upper end face of the concrete portion of the filled concrete steel column are pressed against each other. The lower end of the short column steel frame of the connection structure and the upper end surface of the long column steel frame do not contact each other or do not press against each other. 3. A method according to claim 1 or 2, wherein a side end face and an upper end face of the concrete portion of the filled concrete steel column are formed. 4. An anchoring metal is fixed to a lower end portion of a connecting steel bar, and a lower portion of the connecting steel bar is arranged in the long pillar steel so that the anchoring metal is located in the middle of the long pillar steel. A method for constructing a building body using the connection member according to any one of claims 1 to 3. 5. A sheath is provided on an upper portion of a connecting steel bar disposed in a long column steel frame, and only a lower portion of the connecting steel bar disposed in the long column steel frame is fixed to concrete.
The method according to any one of claims 1 to 3, wherein a lower portion of the connecting steel bar is disposed in a long steel column. 6. A short column steel frame having a closed section, a beam mounting body is fixed outside the short column steel frame, and a stiffener is fixed inside the short column steel frame. A joint structure, wherein a concave portion or a convex portion is formed in a center of a lower portion of a concrete portion in a steel frame, and a plurality of through holes extending in a vertical direction are formed in the concrete portion. 7. A cross-shaped (or T-shaped) steel frame formed by cross-linking a plurality of short H-shaped steels into a cross-shaped (or T-shaped) steel. A short column steel frame is formed such that a portion close to the intersection of the stiffener becomes a stiffener and a portion away from the intersection of the cross-shaped (or T-shaped) steel frame becomes a beam attachment portion. The joint structure according to claim 6, wherein