JP3199438B2 - Composite frame structure of building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure in which concrete and steel structures are combined, and more particularly to a joint between a column and a beam and a column mounting structure.

[0002]

2. Description of the Related Art Reinforced concrete structures, steel frame structures, and their composite structures as building structures have been developed as independent academic and technical systems for each structure.・ They are maintained in the form of guidelines. However, each of these structures has its own characteristics, and the scope of application is naturally determined. For example, a reinforced concrete structure has the advantages of high fire resistance, corrosion resistance, and high rigidity, but has the disadvantage of being disadvantageous for earthquakes and foundations and has a long construction period. on the other hand,
Steel structure is thin and light in cross section, so it is advantageous for earthquakes and foundations.However, fire resistance, corrosion resistance, rigidity, vibration damping, etc. are small, fire resistant coating and rust prevention are required, and it is easy to cause vibration damage. There are drawbacks. Therefore, in order to compensate for such a drawback, a composite structure combining steel frame and concrete (SC
) Is used.

Conventionally, as a method of constructing a frame having such a composite structure, a method of first assembling a steel frame, further providing a temporary framework for placing concrete and reinforcing bars, and then placing concrete is adopted. I have.

[0004] Further, as a steel frame structure composed of columns and beams,
Generally, a bracket is welded in advance to the side surface of a pillar, and the bracket and the beam are joined by bolts via a joining plate, or the end plate welded to the end of the bracket and the end plate at the end of the beam are joined together. Similarly, joining with bolts is performed.

[0005] The lower end of the column has a horizontal end plate welded to the lower end in advance, and the end plate is fixed to a plurality of anchor bolts with bolts.

[0006]

[Problems to be solved by the invention] As described above, in the related art, since the construction of concrete from the temporary framework is performed on site in addition to the steel frame, the number of construction steps is extremely large, it takes time and effort, and the construction period is increased, and the cost is also increased. There were drawbacks.

[0007] In addition, the steel frame has the advantage that the welding accuracy is improved because all welding is performed in a factory, and the construction is easy and the construction period can be shortened because only on-site work is performed by bolt connection. However, there are the following disadvantages.

[0008] Even in the case of welding at a factory, if the column is a steel pipe, difficult welding is required due to the closed cross-section, and if a diaphragm is used to increase the cross-sectional strength, it takes a lot of time to process and install it, and production Poor.

[0009] The number of bolts for joining the bracket and the beam increases, resulting in poor work efficiency.

[0010] Similarly, the lower end of the column is fixed to the anchor bolts with many bolts, so that workability is poor and the number of anchor bolts is increased.

[0011] Since the bracket protrudes from the side of the pillar, the transportation efficiency is reduced.

[0012] If the end plate is welded to the end of the bracket, it may be necessary to protrude the end plate vertically to increase the number of bolts in order to increase the bonding strength. In addition to disturbing the floor laying, the fireproof coating will not fit properly.

[0013] In particular, the pillars are one-piece design and one-piece production for realizing a specific structure, and the productivity is low.

[0014] The present invention solves such conventional disadvantages and eliminates the need to perform concrete casting on site.
In addition, there is no need for welding at the factory and site, and since there is no protrusion like a bracket on the side of the pillar, it has excellent transport efficiency, and furthermore, a concrete composite structure that reduces the number of construction steps at the site It is intended to provide a skeleton.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a diaphragm installed at the upper end of a hollow concrete column, and the end plate at the end of a composite beam in which steel is covered with concrete. Engage with the groove provided on the upper surface, further place another diaphragm on the upper end of the end plate, engage the upper end of the end plate with the groove on the lower surface of the diaphragm, connect the concrete column and the diaphragm To the penetrating steel rod,
It is characterized in that it is fixed by tightening with a nut screwed from above the upper diaphragm.

[0016] Also the second invention of this application, the upper and lower da
It is characterized in that a mortar is filled in a space between the diaphragms .

In a third aspect of the present invention, the steel pipe column is a round steel pipe column, each diaphragm is circular, and a notched circular end plate at the beam end is provided in a circular groove of the diaphragm. It is characterized by engaging.

Further, in the fourth invention of this application, the concrete column has a circular cross section, each diaphragm is circular, and a notched circular end plate at the beam end is engaged with the circular groove of the diaphragm. It is characterized by being combined.

[0019]

According to the above construction, the diaphragm is attached to the end of the hollow concrete column, and the beam end of the composite structure is joined to the diaphragm via the steel rod penetrating the diaphragm. Without performing the above steps, it is possible to obtain a skeleton having a composite structure.

Further, since there is no protrusion such as a bracket on the side surface of the column, and since the fixing of the diaphragm and the joining of the beam are performed with a nut for tightening a steel rod, it is not necessary to tighten a large number of bolts. Similarly, columns are also fixed to the anchor bolts of the foundation with nuts that connect one steel bar, so compared to fixing the end plate using a number of bolts, the number of bolts and tightening man-hours are also smaller. Dramatically reduced.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
(1) is a column made of a hollow concrete pipe, (2) is
A lower diaphragm for fixing the beam is shown, and (3) also shows an upper diaphragm. In the upper and lower diaphragms (2) and (3) for fixing the beams, grooves (4) and (4) are formed on the upper surface or the lower surface thereof, which substantially match the cross section of the column (1). Further, circular grooves (9) and (9) are formed on the opposite surface so that a steel pipe is fitted. (5) is a steel rod composed of steel rods of different diameters inserted into the column (1), and male screws (6) (6). Is formed. In each of the diaphragms (2) and (3), through-holes (7) (7)... Having a size through which the steel rod (5) passes are formed in the center thereof.

As shown in FIG. 3, the beam (8) is wound around the outer circumference of a pair of upper and lower steel pipes (9) and (9).
It is obtained by arranging (11), arranging it in a temporary frame and casting concrete (12). In the production, it is conceivable to use a high-strength prestressed concrete by a pretensioning method using centrifugal force in addition to a normal casting method. In addition, rebar (10) (11)
The upper end and the upper half of the upper steel pipe (9) are exposed to be buried in the floor slab concrete (15) to be cast later.

Further, an end plate (13) bent to the same curvature as one of the grooves (5) (5) of the diaphragms (2) (3) is fixed to the end face by welding. The end plate (13) is formed by, for example, vertically dividing a short steel pipe. (14) is a stud material protruding outside the end plate (13).

Next, the structure of the frame using the concrete columns (1) and the beams (8) will be described in the order of construction.

First, as shown in FIG. 2, an anchor bolt (17) made of the same steel rod as the steel rod (5) is placed on a concrete foundation (16) to be cast in place. It is buried so that it protrudes. A fixing plate (18) is externally fitted to a lower end of the anchor bolt (17), and a fixing nut (19) is screwed below the fixing plate (18).

Then, a nut (21) also serving as a coupler is screwed into the male screw (20) at the upper end of the anchor bolt (17),
Further, the lower end of the steel rod (5) inserted into the column (1) is screwed into the coupler nut (21), and is erected upward. In this state, the column (1) is installed so as to cover the steel bar (5) from above, and the lower end thereof is installed on the foundation (16).

As described above, the concrete column (1)
After mounting, as shown in FIG. 1, a lower diaphragm (2) for fixing a beam (8) is provided at its upper end with a groove (4) on its lower surface.
Then, the upper end of the column (1) is engaged with the steel bar (5), and the steel bar (5) is tightened and fixed from above with a nut (23) screwed to the vicinity of the upper end.

Next, the beam (8) is suspended, and the lower end of the end plate (13) is engaged with the groove (9) on the upper surface of the diaphragm (2) at the upper end of the steel pipe column (1). Install. At this time, the remaining portion of the groove (9) in which the end plate (13) is not engaged is similarly bent and covered with concrete (25) on the outer surface, and the stud material (14) is projected. The plate (24) is installed with its lower end engaged with the groove (9), and these end plates (13)
Non-shrink mortar (27) in the space surrounded by the support plate (24)
Fill. Then, the upper diaphragm (3) is placed thereon with the end plates (13) and the upper ends of the support plates (24) engaged with the grooves (9) on the lower surface thereof. 5) Tighten and fix with the nut (26) screwed to the upper end.

After that, if there is an upper floor,
Another steel bar (5) is connected using a coupler nut (28), and the column (1) on the upper floor is similarly engaged with the groove (4) on the upper surface of the diaphragm (3). It is installed and fixed, and the beam (8) is similarly joined to its upper end (not shown).

In the figure, since the beam (8) is joined only in one direction, a support plate (24) is provided at another portion without the end plate (13). When two or more protrude in a plurality of directions, it is not always necessary to provide the support plate (24).

FIG. 5 shows an example in which this frame structure is assembled on an irregular site. In this manner, the beam (8) is
Since the direction can be freely changed in the circumferential direction in the groove (9) in the diaphragms (2) and (3), it is possible to easily cope with an irregular site.

FIG. 6 shows a case where the concrete column (1) is built on a slope, and as described above, the concrete column (1) has a shape simply cut to a predetermined length. By appropriately changing the height, it is possible to easily cope with such a slope. In addition, since the height of the beam (8) can be arbitrarily changed, a space having a change such as a skip floor or a stairwell can be relatively easily created.

[0033]

According to the present invention, the following effects can be obtained.

A. A structure in which a beam composed of a steel frame and concrete is joined to a concrete column via a diaphragm and a steel bar, so that concrete casting on site is not required, and the conventional concrete method and composite with concrete are used. Compared with the structure, labor on site work can be greatly reduced, and the construction period can be shortened.

B. Since it is only necessary to mold the concrete column to a predetermined length without welding the bracket to the column, the manufacturing cost of the column is greatly reduced.

C. The end plate of the beam is fastened and fixed using the steel rod and the diaphragm inserted into the column.
The steel bar can be fixed only by tightening it with one nut, so that it is not necessary to tighten many bolts as in the prior art, and the number of parts is reduced and the number of construction steps on site is greatly reduced.

D. At this time, since the end plate of the beam is engaged with the groove of the diaphragm, not only positioning is easy, but also sufficient strength can be provided in the horizontal direction.

E. In addition, since the end plate can be arbitrarily rotated and mounted in the circumferential direction of the groove, it can easily cope with an irregular site where the angle of the corner of the outer wall does not become a right angle. .

F. Since the column is inserted and fixed by a steel rod connected to the anchor bolt side, the column is fixed unlike the conventional one in which the end plate of the steel pipe column is fixed to the anchor bolt. Also, the man-hour for tightening the bolts is reduced.

G. Since the column does not protrude with the bracket or the end plate for fixing to the foundation, the transportation efficiency is improved.

H. As described above, since the concrete column is simply molded to a predetermined length, it can be easily adapted to a slope by appropriately changing its length, or can be skipped. A floor-like structure can be easily configured.

I. In addition, since only one anchor bolt is required, the reinforcement of the foundation, that is, the construction work of the foundation is facilitated.

J. Since the end plate of the beam fits within the cross section of the column and there are no protrusions to the top and bottom or left and right of the beam, there is an effect that the floor can be easily laid and the fireproof coating can be easily made. .

K. Pillars, diaphragms, steel rods, etc. can be used almost in common in any building, and are designed to be industrially produced by designing structures as versatile and interchangeable parts. Increasing productivity.

L. For this reason, mass production is possible and significant cost reduction is possible.

M. Needless to say, since it is not a single structure of concrete or steel frame, an excellent product which compensates for the shortcomings of those single structures can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a column-beam joint portion showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a mounting structure of a lower end of a pillar.

FIG. 3 is a sectional view of a beam.

FIG. 4 is an exploded perspective view of a beam joining portion.

FIG. 5 is a plan view showing an example of a case where the present invention is implemented on an irregular land.

FIG. 6 is an elevation plan view when the same is applied to a slope.

[Explanation of symbols]

 (1) Concrete pillar (2) Diaphragm (3) Diaphragm (4) Groove (5) Steel rod (8) Beam (9) Groove (13) End plate (16) Concrete foundation (17) Anchor bolt (23) Nut ( 26) Nut (27) Mortar

Continued on the front page (72) Inventor Tomoji Iijima 6-2-27 Nakanoshima, Kita-ku, Osaka-shi Sekisui House Co., Ltd. (72) Inventor Yoshihiro Yoshizaki 6-2-27 Nakanoshima, Kita-ku, Osaka Sekisui House Co., Ltd. (72) Inventor Shigekazu Yokoyama 6-27, Nakanoshima, Kita-ku, Osaka-shi Sekisui House Co., Ltd. (72) Inventor Satoko Shimizu 6-27, Nakanoshima, Kita-ku, Osaka Sekisui House, Inc. (58 ) Surveyed field (Int.Cl. ⁷ , DB name) E04B 1/30

Claims (4)

(57) [Claims] 1. A diaphragm is installed at the upper end of a hollow concrete column, and an end plate at the end of a composite beam in which a steel frame material is coated with concrete is engaged with a groove provided on the upper surface of the diaphragm. Another diaphragm is placed on the upper end, the upper end of the end plate is engaged with the groove on the lower surface of the diaphragm, and the steel rod is connected to the foundation side and passes through the concrete column and the diaphragm,
A composite frame structure for a building, wherein the composite frame structure is fixed by tightening with a nut screwed from above the upper diaphragm. 2. The composite frame structure of a building according to claim 1, wherein a space between the upper and lower diaphragms is filled with mortar. 3. A reinforcing bar is arranged around a pair of upper and lower steel pipes,
3. The composite frame structure of a building according to claim 1, wherein a composite beam in which the steel pipe and the reinforcing steel are covered with concrete is used. 4. The concrete column has a circular cross section, each diaphragm has a circular shape, and a notched circular end plate at a beam end is engaged with a circular groove of the diaphragm. The composite frame structure of the building according to any one of claims 1 to 3.