JPH03293445A - Structure of building and construction - Google Patents

Abstract

PURPOSE:To reduce cost, by placing and fixing a large steel frame beam made of steel frame and reinforced concrete at the end thereof on the upper end of a steel reinforced concrete post. CONSTITUTION:After a unit of previously assembled steel rods with main reinforcement of a column, hoop steel rods are fastened at the main reinforcement of the column protrusively provided on the underfloor slab, a steel pipe with the same length as the size under the beam is erected as a robber mold at the outer side and concrete is placed on the inside to form a column 1. Next, large steel frame beams 2, 3 are installed and then upper and lower main reinforcement, spiral stirrups, etc., are arranged at the ends 2b, 3b. Next, after beams 2, 3 are laid and fixed at the upper end of the column 1, the edges 2b, 3b are covered with concrete to be unified with the column 1. And then a small beam 4 is fitted to the steel frame of the beam 2 via a gusset plate and further, a floor slab 5 is applied. In this way, the structure can be simply constructed and steel frames can be economized and moreover the rigidity of the beam ends is increased with adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a structure that serves as the frame of various buildings and a construction method thereof.

"Conventional technology and its problems" As is well known, the structure that forms the framework of a building is a steel frame structure (
S construction), reinforced concrete IJ structure (RC construction), and steel reinforced concrete construction (SRC construction) are common, but although S construction has an advantage in terms of construction period, it is disadvantageous in terms of construction cost. In addition, RC structures require various types of work such as reinforcing steel work, formwork work, concrete pouring work, etc., and are therefore more complicated to construct than steel structures. Due to the rising cost of labor and materials, there is no longer much of an advantage in terms of construction costs.
Furthermore, although SRC construction is most advantageous in terms of structural strength, it is disadvantageous in terms of construction period and construction cost.

The present invention has been made in view of the above circumstances, and its purpose is to simplify construction, shorten construction period and cost, and obtain sufficient structural strength. An object of the present invention is to provide a structure and a construction method thereof.

"Means for Solving the Problem" The invention according to claim 1 is a building structure formed by joining the end of a girder to the upper end of a column, wherein the column is made of reinforced concrete, and It is characterized in that the ends of the girders are made of steel reinforced concrete, and the middle part of the girders is made of steel.

The invention of claim 2 is a method for constructing a building structure according to claim 1, in which the pre-assembled column layer reinforcing bars are erected, and then a steel pipe is used as a waste form and concrete is poured into the inside of the structure. After constructing reinforced concrete columns up to the bottom of the beams by pouring concrete beams, a steel frame with beam reinforcing bars and suspension formwork attached in advance to the ends of the girders is supported at the top of the columns. Bridge, then half P
The method is characterized in that the C deck slab is laid by being supported by the steel frame, and then concrete is poured into the beam formwork and on the nof PC deck slab.

"Operation" The structure of the invention of claim 1 has a composite structure in which the columns are made of RC, the ends of the girders are made of SRC, and the middle part of the girders is made of S. Therefore, the structure as a whole is made of RC or SRC. The amount of reinforcing bars is reduced compared to when the entire building is S-framed, as well as formwork work and concrete pouring work on site, and the amount of steel is also reduced compared to when the entire structure is S-framed. be done. Furthermore, since the ends of the girders are made of SRC construction, the rigidity of the beam ends can be sufficiently increased, and the rigidity of the beam ends can be adjusted by increasing or decreasing the length of the SRC construction part. .

Further, in the construction method of claim 2, pre-assembled reinforcing bars are used as the column layer reinforcing bars, and steel pipes are used as the formwork, and
Prior to erecting the steel frame, beam reinforcing bars are attached to the ends of the beams, the beam formwork is suspended from the steel frame itself, and half PC slabs are used as the floor formwork. This reduces reinforcing steel work and formwork work on site, and simplifies construction.

"Embodiments" Examples of the present invention will be described below with reference to FIGS. 1 to 7.

Figures 1 and 2 show a structure according to the present invention with a relatively large span length (approximately 10 to 18 m) and a height of 4 m.
An elevational cross-sectional view and a plan view (floor plan) showing an example of the case where it is adopted as the frame of a medium-rise building of about 5 to 5 stories. In the figure, reference numeral 1 indicates a column, and 2 indicates a girder in the span direction. , 3 is a large beam in the column direction, 4 is a small beam provided in the column direction, and 5 is a floor slab.

As will be described later, the pillar 1 is of reinforced concrete construction (RC construction) with a circular cross section, and is formed by using a steel pipe as a waste form and pouring concrete into the inside. Large-diameter reinforcing bars are used as the main reinforcement in the second column 1, and they are also used as deformed PC steel bars or spiral hoops.

Moreover, the girders 2 and 3 each have a steel frame (H-beam) 2a.

Since the ends 2b and 3b of 3a, that is, the part near the joint with the column 1, are covered with reinforced concrete, only the ends 2b and 3b are made of SRC construction,
The middle part is an S structure made of the steel frame 2.3 itself. The ends 2b of these girders 2 and 3 are made of SRC
, 3b, large-diameter reinforcing bars are used as the main beam reinforcements, and deformed PC steel bars are used as spiral stirrups.

Furthermore, the small beams 4 are of S construction made of H-shaped steel, and both ends of these small beams 4 are joined to the side surfaces (webs) of the large beam 2 via gusset plates (as shown). It has become. Note that a half-PC beam may be used as the small beam 4.

Furthermore, although the floor slab 5 is of RC construction, a half P
It is formed by pouring concrete onto the C slab.

In the above structure, the column l is made of RC, and the end part 2b of the girder 2.3
, 3b is SRC construction, the middle part of girders 2 and 3 is steel frame 2*, 3
Since it is a composite structure of S construction consisting of a itself,
Compared to the case where the entire structure is made of RC or SRC, the amount of reinforcing bars is reduced, and the amount of concrete pouring work on site is also reduced, which simplifies construction and shortens the construction period. Since the amount of steel used can be reduced compared to the case where the entire structure is made of steel, it can also contribute to a reduction in construction costs.

In the above structure, the ends 2b, 3 of the girder 2.3
b is made of SRC construction, the rigidity at the beam end is sufficiently increased, and by increasing or decreasing the length of the SRC construction, the rigidity of the beam end can be adjusted to the optimum. It is something that can be done. In addition,
By performing structural calculations assuming that the end portion of the beam made of SRC is RC construction, a sufficient safety factor can be expected for the rigidity of the beam end.

Next, an example of the construction method for the above structure is shown in Figures 3 to 7.
This will be explained with reference to the figures.

First, as shown in FIG.
Column main reinforcement 10' that is installed in advance on the floor slab of the lowest floor
4 (a) on the outside of the pre-assembled reinforcing bars 12.
As shown in FIG. 1, a steel pipe 13 having a length approximately equal to the beam bottom dimension of this column 1 is erected as a waste form, and concrete is poured inside it. As a result, the RC column 1 covered with the steel pipe 13 is constructed to the bottom of the beam. At this time, pillar 1
As shown in FIG. 4(B), a base plate 30 for fastening the girder 2 is embedded in the upper end surface of the base plate 30.

Next, as shown in FIGS. 5(a) and 5(b), the steel frame 2a, which will become the girder 2 in the span direction, is supported on the upper end of the column 1.1 and fastened to the base plate 30, thereby constructing the bridge. , as shown in FIGS. 5(c) and 5(d), the steel frames 3a, which will become the girders 3 in the column direction, are joined to the side surfaces of the steel frames 2a via gusset plates 31, so that the columns 1.1 are hung between each other. 23.
3a is supported from the floor by a temporary support 15.

At this time, the steel frames 3a that will become the girder 3 in the girder direction are the length between the adjacent columns 1.1, but the steel frames 2a that will be the girder 2 in the span direction are long ones that span multiple spans. use As shown in detail in Figure 5 (b), these steel frames 2a and 3a are pre-installed with beam main reinforcements 16 at positions that will become the beam ends prior to erection. , the lower beam main reinforcement 16b and the spiral 7-rab/b 17 are attached, and the fixing plate 18 is attached to the tip of the upper beam main reinforcement 16a,
A crimp sleeve 20 is attached to the tip of the main reinforcement 16b under the beam. These fixing plate 18 and compression sleeve 20 are
Increase the anchoring force between the main reinforcements 16a and 16b and concrete! However, if it is possible to form a hook by bending the main bars 6a and 16b, they may be omitted.

In addition, as shown in FIGS. 6(a) and 6(b), the portions that become the beam ends 2b and 3b of the steel frames 2a and 3a, that is, the portions to which the main reinforcements 16a and 16b and the spiral stirrup 17 are attached. A beam formwork 21 is attached in advance to the outside of the frame. As the beam formwork 21, a repeatable formwork such as a steel formwork is used, and the beam formwork 21 is a steel frame 2! , 31 is used in the form of being suspended from itself,
Shoring for supporting the beam formwork 21 is omitted.

Furthermore, a gusset plate for pin-joining the small beams 4 is attached in advance to the steel frame 3a that becomes the large beam 3 in the span direction, and as shown in FIG. 5 (a) and FIG. 6 (a),
The small beams 4 are connected to the steel frames 2a, 2 through these gusset plates.
a Bridge between each other.

Then, the beam formwork 21. Steel frame 22.3a that becomes the girder
, and by supporting them on the small beams 4, a half PC floor slab 22 is laid on them. This half PC floor slab 22 is
It serves as a waste form when pouring concrete to form the floor slab 5, and becomes a part of the floor slab 5 as it is.

After mesh reinforcement is arranged on the half PC floor slab 22, the inside of the beam formwork 21 and the half PC floor slab 22 are
If concrete is poured on top and the beam formwork 21 is dismantled after a predetermined curing period, the girders 2, 3 and 3 with only the ends 2b and 3b made of SRC, as shown in Fig. 7, are formed. Floor slab 5 is completed. After that, all you have to do is repeat the above steps sequentially for the upper floors.

According to the construction method described above, in particular, by making the steel frame 2a that becomes the girder 2 in the span direction long enough to span multiple spans, it is common to use a steel frame with a length for each span. Compared to the conventional case, the steel frame manufacturing cost is reduced, the structure of the joint part is simplified, and the steel frame work is simplified.

In addition, the steel pipe 13 is used as the column formwork, a hanging formwork that can be used repeatedly is used as the beam formwork 21, and the half-PC is used as the waste formwork 22 of the floor slab 5.
By using floor slabs, the formwork work can be greatly simplified, and large-diameter reinforcing bars are used as the main column reinforcement 10 and beam main reinforcements 16a and 16b, and PC steel rods of different diameters are used as the 7-pipe 11 and stirrup 17. By using it in a spiral shape, not only can sufficient strength be obtained, but the amount of reinforcing bars and the number of joints can be reduced compared to the case where conventional general reinforcing bars are used, and moreover, pre-assembled pre-assembled reinforcing bars 12 are used. This simplifies the reinforcing steel work on site, shortens the construction period and reduces construction costs in these respects as well.

In addition, high-strength concrete (F c = 300 to 3
60 Kg/crg2), the rigidity of the beam end can be further increased and the amount of reinforcing bars can be further reduced.In addition, various reinforcing fibers can be used as the bulk concrete for forming the floor slab 5. The use of mixed fiber concrete can sufficiently prevent cracks in the floor slab.

"Effects of the Invention" As explained in detail above, the structure of the invention of claim 1 is a composite structure in which the columns are made of reinforced concrete, the ends of the girders are made of steel reinforced concrete, and the middle part of the girders is made of steel frame. Because it is a conventional RC or SRC structure, the construction is simpler and the construction period can be shortened, and compared to the conventional S structure. It has the advantage that the amount of steel is reduced and construction costs can be reduced.Moreover, the rigidity at the end of the beam made of SRC construction can be sufficiently increased, and the length of the part made of SRC construction can be increased or decreased. This has the effect that the stiffness of the beam end can be adjusted to an optimum value.

Further, the construction method of the invention of claim 2 uses pre-assembled reinforcing bars as the column-side reinforcing bars, and uses steel pipes as the formwork, and also, prior to erection of the steel frame, the beam reinforcing bars and By installing hanging formwork (as well as using half PC floor slabs as floor formwork), on-site reinforcing work and formwork work are reduced, simplifying construction. This can sufficiently reduce construction costs, and is suitable for use when constructing the above structure.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of a structure according to the present invention, with FIG. 1 being an elevation view and FIG. 2 being a plan view. 3 to 7 are diagrams showing an embodiment of the construction method according to the present invention in the order of steps, and FIG. 3 is an elevational view, and FIG. 4 (
A) is an elevation view, FIG. C) is a plan view of the joint section, FIG. 6 (D) is a side view of the joint section, FIG. 6 (A) is an elevation view, FIG. It is a front view. 1... Column, 2, 3... Beam, 2g, 3a
... Steel frame, 2b, 3b ... End of girder,
4... Small beam, 5... Floor slab, 10.
...Column main reinforcement, 11...Spiral 7 bars,
12... pre-assembled reinforcing bar, 13... steel pipe, 1
5...Support, 16a, 16b...
Beam main reinforcement, 17...Spiral stirrup, 21
...Beam formwork (hanging formwork), 22 ...Half PC floor slab, 30 ...Base plate, 31.
...Gusset plate.

Claims (2)

[Claims] (1) A building structure formed by joining the end of a girder to the upper end of a column, the column being made of reinforced concrete,
A building structure characterized in that the ends of the girders are made of steel-framed reinforced concrete, and the intermediate portions of the girders are made of steel. (2) A method for constructing a building structure according to claim 1, which comprises erecting pre-assembled column reinforcing bars and then using a steel pipe as a waste form and pouring concrete inside it. After constructing reinforced concrete columns up to the bottom of the beams, a steel frame with beam reinforcing bars and suspension forms attached to the ends of the large beams is supported on the upper ends of the columns, and then the half beams are constructed. A method for constructing a building structure, comprising: laying a PC floor slab by supporting it on the steel frame, and then pouring concrete into the beam formwork and onto the half PC floor slab.