JP2939427B2 - The end is reinforced concrete and the center is a steel beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete beam at the end and a steel beam at the center.

[0002]

2. Description of the Related Art In a reinforced concrete building having a large span, a beam 20 having a reinforced concrete at the end and a steel frame at the center as shown in FIG. 10 is used.

The beam 20 is constructed by embedding an end of a steel frame 40 in a reinforced concrete section 30, and is thought to transmit stress by a bearing mechanism as shown in FIG.

[0004]

However, in the beam having such a structure, the end of the steel frame is embedded in the reinforced concrete portion to increase the strength. However, stress concentrates on the portions a and b in FIG. Therefore, the transmission of stress from the steel beam to the reinforced concrete part was not performed smoothly.

[0005] Therefore, conventionally, the location where the stress is concentrated is sheared and reinforced to increase the cost.

In addition, the joining of the end of the steel beam to the reinforced concrete part is performed on site, which is troublesome.

The present invention has been made in view of such a problem, and an object thereof is to smoothly transmit stress from a steel beam to a reinforced concrete part in a reinforced concrete end part and a steel part center part. As well as to easily join the end of the steel beam with the reinforced concrete part.

[0008]

According to a first aspect of the present invention, there is provided a precast reinforced concrete section having protruding main bars at both ends of a steel beam. The entire length of the main reinforcement buried in the reinforced concrete part is constrained by the steel plate, and some of the main reinforcements constrained by the steel plate are replaced by steel beam beams .
And a support plate is provided on the steel beam at the wood end of the precast reinforced concrete portion at the rear end side of the precast reinforced concrete portion. Main reinforcements formed at both ends of the steel beam and embedded in the precast reinforced concrete portion are restrained by a steel plate, and some of the main reinforcements restrained by the steel plate are reinforced by steel beams .
The end of the main reinforcement not welded to the flange of the steel beam is formed in a hoop shape, and a supporting plate is provided on the steel beam at the wood end side of the rear end side of the precast reinforced concrete part. The invention of claim 3
In Claim 2, the entire length of the main reinforcement buried in the precast reinforced concrete portion is restrained by a steel plate, and the invention of Claim 4 is the invention according to any one of Claims 1, 2, and 3 A cotter is provided on the tip of the tip of the part.

[0009]

By pre-cast reinforced concrete part which tip is protruded of the action] main reinforcement is formed at both ends of the steel beam, in the bending moment tension side acts on the steel beam end, it is smoothly transferred to the pre-cast reinforced concrete section . By providing the bearing capacity plate steel beam in butt surface of the rear end side of the Matapu Rekyasuto reinforced concrete section, the bending moment in the compression side is smoothly transmitted to the precast reinforced concrete section. Also,
In this transmission, the entire length of the main reinforcement is
By increasing the strength of the reinforced concrete part ,
More effectively done.

[0010] A part of the main reinforcement of the precast reinforced concrete portion is welded to the flange of the steel beam , and the end of the main reinforcement not welded to the flange of the steel beam is formed in a hoop shape. The main reinforcement buried in is restrained by steel plate,
The bending moment acting on the end of the steel beam is smoothly transmitted to the precast reinforced concrete part on the tension side. In addition, by providing a support plate on the steel beam at the wood end of the rear end side of the precast reinforced concrete part,
The bending moment is smoothly transmitted to the precast reinforced concrete part on the compression side. Further, this transmission is performed more effectively because the entire length of the main reinforcement buried in the precast reinforced concrete portion is restrained by the steel plate.

Further, since the precast reinforced concrete portions are formed at both ends of the steel beam, the connection with the reinforced concrete columns can be easily performed.

[0012] Further, since the precast reinforced concrete portions having the protruding tips of the main bars are formed at both ends of the steel beam, the steel beam can be embedded up to the reinforced concrete column, so that the force can be dispersed and transmitted.

Further, the strength of the precast reinforced concrete part is enhanced by restricting the entire length of the main reinforcement buried in the precast reinforced concrete part with a steel plate.

Further, by providing a cotter on the tip end of the precast reinforced concrete portion, the shear resistance with the reinforced concrete column can be increased.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a reinforced concrete beam having a reinforced concrete end and a steel frame having a central portion.

1 to 4 show an embodiment of the invention according to claim 1, FIG. 1 is a longitudinal side view of a beam, FIG. 2 is a longitudinal side view of an end of a beam, and FIG. FIG. 4 is a plan view, and FIG.
FIG. 4 is a cross-sectional view taken along a line A.

As shown in FIG. 1, the beam 1 is formed by forming precast reinforced concrete portions 3 at both ends of a steel beam 2. At this time, the steel frame may be wrapped with concrete, or may be coated with fireproof instead of wrapping concrete.

From the precast reinforced concrete section 3, the tip of the main bar 4 is projected, and a part of the main bar 4 is welded to the flange 6 of the steel beam 2.

The entire length of the buried main reinforcing bar 4 is restrained by a steel plate 7, and the steel plate 7 reinforces the entire precast reinforced concrete portion 3.

A cotter 8 is provided at the edge of the precast reinforced concrete section 3 from which the main reinforcement 4 is projected, and functions to increase the shear resistance with the reinforced concrete column 9.

Further, the supporting plate 1 is attached to the steel beam 2 in the vicinity of the cut edge on which the cotter 8 is provided and on the opposite cut edge.
0 is welded . With Bearing plates 10 This is welded between the upper and lower flanges 6 on both sides of the web 5, the cotter 8
The supporting plate 10 on the other side of the front end of the front end of the front end protrudes from the upper flange 6 and the lower side of the lower flange 6.

Next, transmission of stress from the steel beam 2 to the precast reinforced concrete section 3 will be described with reference to FIG.

The tensile side of the bending moment is shown in FIG.
As shown in the figure, the power is smoothly transmitted through the main reinforcement 4 of the precast reinforced concrete portion 3 welded to the flange 6.

The compression side of the bending moment is smoothly transmitted to the precast reinforced concrete section 3 through the support plate 10, as shown in FIG.

In this portion, the steel plate 7 is wound to increase the restraining force of the precast reinforced concrete portion 3 to increase its bearing capacity and to transmit the stress smoothly by leverage.

The shearing force is transmitted to the precast reinforced concrete portion 3 by the bearing strength of the flange 6 having the web 5, as shown in FIG.

In the same manner as described above, since the steel plate 7 wound around this portion strengthens the restraining force of the precast reinforced concrete portion 3 and increases its bearing capacity, stress can be transmitted effectively.

FIG. 6 shows the precast reinforced concrete section 3 in which all the main reinforcements 4 are threaded reinforcements, and the ends of the reinforcements are attached to the support plate 10 with nuts 11. With this configuration, the tensile stress of the bending moment can be smoothly transmitted to the precast reinforced concrete portion 3 as described above.

FIGS. 7 to 9 show a second embodiment of the present invention. FIG. 7 is a vertical sectional side view of an end portion of a beam, FIG. 8 is a cross-sectional plan view thereof, and FIG. FIG. 4 is a sectional view taken along line C of FIG.

This is because, as shown in FIG. 7, some of the main reinforcements 4 of the main reinforcements 4 of the precast reinforced concrete section 3 are made of iron.
It is welded to the flange 6 of the trabecular bone 2 and
End of the main sources 4 are formed on the hoop not.

The main reinforcing bar 4 and the hoop-shaped main reinforcing bar 4 welded to the flange 6 are constrained to the steel beam 2 by a steel plate 7.
Other configurations are the same as those of the first aspect.

[0032]

According to the present invention, a precast in which the tip of the main bar is protruded.
Reinforced concrete sectionButWhat was formed at both ends of the steel beam
The bending moment acting on the end of the steel beam
Smooth to precast reinforced concrete section
Communicated to. AlsoRecast reinforced concrete part
The support plate was installed on the steel beam at the wood end of the rear end.
Therefore, the bending moment on the compression side
Smoothly transmitted to reinforced concrete. Ma
This transmission isThe entire length of the main bar is restrained by the steel plate and
The strength of the reinforced concrete section has been increased.By
This is more effectively achieved by leverage.

Some of the main reinforcing bars of the precast reinforced concrete portion are welded to the flange of the steel beam , and the ends of the main reinforcing bar that are not welded to the flange of the steel beam are formed in a hoop shape. The main reinforcement buried in is restrained by steel plate,
The bending moment acting on the end of the steel beam is smoothly transmitted to the precast reinforced concrete part on the tension side. In addition, by providing a support plate on the steel beam at the wood end of the rear end side of the precast reinforced concrete part,
The bending moment is smoothly transmitted to the precast reinforced concrete part on the compression side. In addition, this transmission is more effectively performed by increasing the strength of the precast reinforced concrete portion by restricting the entire length of the main reinforcement with the steel plate.

By forming the precast reinforced concrete sections at both ends of the steel beam, it is possible to easily join the reinforced concrete columns.

By forming the precast reinforced concrete portions with the protruding tips of the main bars at both ends of the steel beam, the steel beam can be embedded up to the surface of the reinforced concrete column, so that the force can be dispersed and transmitted.

The strength of the precast reinforced concrete part is increased by restricting the entire length of the main reinforcement buried in the precast reinforced concrete part with a steel plate.

By providing a cotter at the tip end of the precast reinforced concrete portion, shear resistance with the reinforced concrete column can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a reinforced concrete beam at the end and a steel beam at the center.

FIG. 2 is a vertical sectional side view of an end of a beam.

FIG. 3 is a cross-sectional plan view of an end of a beam.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIGS. 5A and 5B are conceptual diagrams showing stress transmission.

FIG. 6 (1) is a longitudinal sectional side view in which a main reinforcement is screwed to a support plate,
FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 7 is a longitudinal sectional side view of an end of a beam.

FIG. 8 is a cross-sectional plan view of the end of the beam.

FIG. 9 is a sectional view taken along the line CC of FIG. 8;

FIG. 10 is a longitudinal sectional side view of a conventional beam having a reinforced concrete end and a steel frame at the center.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 beam 2 steel beam 3 precast reinforced concrete part 4 main reinforcing bar 5 web 6 flange 7 steel plate 8 cotter 9 reinforced concrete column 10 support plate 11 nut

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayuki Oi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Nobuyuki Izumi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References JP-A-6-306948 (JP, A) JP-A-1-268947 (JP, A) JP-A-6-272311 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) E04C 3/20 E04B 1/16

Claims (4)

(57) [Claims] 1. A precast reinforced concrete section having protruding tips of main bars is formed at both ends of a steel beam, and the entire length of a main bar buried in the precast reinforced concrete section is constrained by a steel plate. Some of the main bars are welded to the flange of the steel beam,
A support beam is provided on a steel beam at the wood end surface of the precast reinforced concrete part at a rear end thereof. A reinforced concrete end and a steel frame at the center. 2. A precast reinforced concrete section having protruding tips of main bars is formed at both ends of a steel beam, and a main bar embedded in the precast reinforced concrete section is constrained by a steel plate, and the main bars constrained by the steel plate. Some of the main bars are welded to the flange of the steel beam , the ends of the main bars not welded to the flange of the steel beam are formed in a hoop shape, and the steel beam at the wood end side of the rear end side of the precast reinforced concrete portion A reinforced concrete beam at the end and a steel frame at the center. 3. The beam as claimed in claim 2, wherein the entire length of the main reinforcement embedded in the precast reinforced concrete portion is restrained by a steel plate. 4. The precast reinforced concrete part has a cotter provided at a tip end side at a tip end thereof, wherein the end part is made of reinforced concrete and the center part is made of steel. Beams.