JP3050136B2 - Connection structure between reinforced concrete columns and steel beams with large diameters only in the column reinforcement around the panel zone - 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 (hereinafter referred to as RC) in which only a main bar around a panel zone has a large diameter.
(Hereinafter referred to as S) and a joint structure of a steel frame (hereinafter referred to as S) beam.

[0002]

2. Description of the Related Art In recent years, a hybrid that uses RC, which has high compressive force, as a column and S, which is light and has high bending resistance, as a beam, has a large span, facilitates weight reduction of a frame, and shortens the construction period. The structure is in the spotlight.

[0003] In particular, if precast RC columns,
Since cast-in-place concrete is omitted, it is avoided from temporary construction of formwork, etc., and everything is manufactured at the factory and transported to the site, which contributes to shortening the construction period and cost, and the site's stock yard including equipment etc. can be small. .

However, in the conventional hybrid structure, the joints are complicated, difficult to manufacture, and costly.

FIG. 4 is a view showing a conventional hybrid structure of a beam-column joint, in which (a) shows a case where stress is small, a beam flange is a one-side shear type joint using a high-strength bolt, and a web is not joined. FIG. 4B is a diagram showing a case where the stress is large, the beam flange is a two-sided shear joint using a high-strength bolt, and the web is also a two-side shear joint using a high-strength bolt.

[0006] Therefore, a steel plate joining structure has been developed which is economical by reducing factory processing of joining hardware.

FIG. 3 is a conceptual diagram of a steel plate joining structure between a precast RC column and an S beam.

However, in this structure, if the main reinforcement of the precast RC column is left as it is, the shear strength of the panel zone portion is small, and there is a practical problem as it is.

Therefore, a structure is provided in which the reinforcing bars in the panel zone portion of the precast RC column are thickened to increase the shear strength.

[0010]

A first aspect of the present invention is to provide two cross joints in the vicinity of a panel zone of a precast reinforced concrete column on the lower floor with an interval sufficient to hold a flange of a steel beam to be joined. A large-diameter reinforcing bar is buried in a main reinforcing bar of the precast reinforced concrete column via a different-diameter mechanical joint so as to protrude from an upper end of the precast reinforced concrete column, and a flange of a steel beam is sandwiched by the cross joint and a high-strength bolt is inserted. The main bar of the precast reinforced concrete column on the upper floor is joined to the large-diameter reinforcing bar protruding from the upper end of the precast reinforced concrete column via a different-diameter sleeve joint. The main purpose is a joint structure between a reinforced concrete column and a steel beam with only a large diameter.

A second aspect of the present invention provides a precast reinforced concrete column on the lower floor having the same height as an upper flange of a steel beam to be joined, and a cross joint and a different diameter mechanical joint at a lower flange portion of the steel beam. A large-diameter reinforcing bar is buried in the main reinforcing bar of the precast reinforced concrete column through the upper end of the precast reinforced concrete column, and the buried cross joint and a cross joint disposed on the upper surface of the precast reinforced concrete column, The flange of the steel beam is sandwiched and fastened with high-strength bolts, and the main reinforcement of the precast reinforced concrete column on the upper floor is joined to a large-diameter reinforcement projecting from the upper end of the precast reinforced concrete column via a different-diameter sleeve joint. Reinforced concrete with a large diameter only in the column main bar around the panel zone The joint structure of the REIT columns and steel beams to the gist.

According to the first aspect, the operation of inserting the flange of the S beam to be joined between the two cross joints embedded in the built pillar is a considerably difficult operation.

According to a second aspect of the present invention, in order to solve this difficult work, only one cross joint is buried at first, and the S beam to be joined is mounted on the cross joint. Since the step of arranging the cross joint and joining the beam flange is performed, the construction work is extremely easy.

Of course, since the reinforcing bar in the panel zone becomes thicker, the initial shear strength can be increased.

Further, if the RC columns are precast, cast-in-place concrete is omitted, and it is avoided from temporary construction such as formwork, and all are manufactured at the factory and transported to the site.
This contributes to shortening of the construction period and cost, and the on-site stockyard, including equipment, can be small.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a precast RC in which only the main bar around the panel zone according to claim 1 has a large diameter.
It is a figure of the joint structure of a pillar and S beam.

In the vicinity of the panel zone of the precast RC column 1 on the lower floor, two cross joints 3 are provided with an interval enough to hold the flange of the S beam 2 to be joined.
A large-diameter reinforcing bar 6 is attached to a main reinforcing bar 5 of the precast RC column 1 through a different-diameter mechanical joint 4,
It is buried so as to protrude from the upper end of the column 1, and the flange of the steel beam is sandwiched by the two cross joints 3 and fastened with high-strength bolts. 6 、 Precast RC column 1 on the upper floor
The main bar 5a of FIG. 3A is joined via a sleeve joint 7 of different diameter.

FIG. 2 shows a precast RC column having a large diameter only at the column main reinforcement around the panel zone according to the second aspect.
It is a figure of the joining structure of a beam.

The precast RC column 1 on the lower floor is made the same height as the upper flange of the S beam 2 to be joined, and a cross joint 3 is provided at the lower flange of the S beam 2.
The precast RC column 1 through a different diameter mechanical joint 4
A large-diameter reinforcing bar 6 is buried in the main reinforcing bar 5 so as to protrude from the upper end of the precast RC column 1, and a cross joint 3 buried therein and a cross joint 3 a provided on the upper surface of the precast RC column 1 Then, the flange of the S beam 2 is clamped and fastened with a high-strength bolt,
The main reinforcement 5a of the precast RC column 1a on the upper floor is joined to the large-diameter reinforcing bar 6 protruding from the upper end of the C column 1 via a sleeve joint 7 of a different diameter.

In both the first and second aspects, it is needless to say that grout is injected into the joints on the upper and lower floors and the sleeve joint 7.

The web of S beam 2 is made of precast R
A gusset (not shown) provided on the C column 1 may be bolted.

[0022]

According to the present invention, since the reinforcing bar in the panel zone becomes thicker, the desired shear strength can be increased.

Also, if the RC columns are precast, cast-in-place concrete is omitted, and it is avoided from temporary construction such as formwork, etc., and all are manufactured at the factory and transported to the site.
This contributes to shortening of the construction period and cost, and the on-site stockyard, including equipment, can be small.

[Brief description of the drawings]

FIG. 1 is a diagram showing a joint structure between an RC column and an S beam having a large diameter only in a column main reinforcement around the panel zone according to claim 1;

FIG. 2 is a diagram of a joint structure between an RC column and an S beam having a large diameter only in a column main bar around the panel zone according to claim 2;

FIG. 3 is a conceptual diagram of a steel plate joining structure between a precast RC column and an S beam.

FIG. 4 is a diagram showing a conventional hybrid structure of a beam-column joint, in which (a) shows a case where stress is small, a beam flange is a one-side shear type joint using high-strength bolts, and a web is not joined. (B) is a diagram in the case where the stress is large, the beam flange is a two-sided shear joint using a high-strength bolt, and the web is also a case where the web is joined in a two-side shear joint using a high-strength bolt.

[Explanation of symbols]

1 ... Precast reinforced concrete columns on the lower floor, 1a ...
... precast reinforced concrete columns on the upper floor, 2 ... steel beams, 3 ... cross joints, 3a ... cross joints, 4 ... mechanical joints with different diameters, 5 ... main reinforcement of lower floor columns, 5
a ... Main pillar of upper floor column, 6 ... large diameter steel bar, 7 ... different diameter sleeve joint, 8 ... grout

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Suzuki 2-9-1-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (56) References JP-A-3-39535 (JP, A) ( 58) Fields surveyed (Int.Cl. ⁷ , DB name) E04B 1/30 E04B 1/16 E04C 3/00-3/46

Claims (2)

(57) [Claims] [Claim 1] In the vicinity of a panel zone of a precast reinforced concrete column on a lower floor, an interval sufficient to sandwich a flange of a steel beam to be joined is provided via two cross joints and a different diameter mechanical joint. A large-diameter reinforcing bar is buried in the main bar of the precast reinforced concrete column so as to protrude from the upper end of the precast reinforced concrete column, a flange of a steel beam is sandwiched by the cross joint and fastened with high-strength bolts, and the precast reinforced concrete column is The main reinforcement of the precast reinforced concrete column on the upper floor is joined to the large-diameter reinforcement protruding from the upper end via a different-diameter sleeve joint. Joint structure of steel beams. 2. A precast reinforced concrete column on the lower floor is made at the same height as an upper flange of a steel beam to be joined, and a cross joint and a mechanical joint of a different diameter are provided at a lower flange of the steel beam. A large-diameter reinforcing bar is buried in a main reinforcing bar of the precast reinforced concrete column so as to protrude from an upper end of the precast reinforced concrete column, and the buried cross joint and a cross joint provided on an upper surface of the precast reinforced concrete column include the steel beam. The main reinforcement of the precast reinforced concrete column on the upper floor is joined to the large-diameter reinforcing bar projecting from the upper end of the precast reinforced concrete column via a different-diameter sleeve joint. Reinforced concrete columns with large diameters only in the column reinforcement around the panel zone Joint structure of steel beams.