JPH07116756B2 - Precast prestressed steel reinforced concrete beam columns Beam connection - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of a column-beam joint portion of a precast prestressed steel-framed reinforced concrete beam, which is a joint portion with a column.

[Conventional technology]

The structure of the beam-column joint of the precast prestressed steel-framed reinforced concrete beam is conventionally the beam 1 including the steel-frame 3 and the steel-reinforced concrete column or the steel-framed reinforced concrete column, as shown in the front sectional view of the beam of the column-beam joint in FIG. The PC steel material 11 for coupling the and is provided on the side portion of the beam 1, that is, the side portion of the beam outside the concrete of the beam, and by tensioning the PC steel material 11, the beam 1
Was firmly connected to the pillar.

Recently, a construction method has been developed in which a precast concrete slab is placed on a beam, cast-in-place concrete is placed on it, and a synthetic slab that is a mechanical combination of the two is constructed. A prestressed steel-framed reinforced concrete beam in which the upper side flange of the steel frame 3 is embedded in concrete when a composite slab is constructed by using a beam whose upper side flange is exposed.

[Problems to be Solved by the Invention]

The present invention, in the structure of the column beam joint portion of the precast prestressed steel frame reinforced concrete beam as described above, creates a coupling structure different from the conventional joint portion, and provides a mechanically rational structure. is there.

[Means for Solving the Problems]

The present invention attaches fixing hardware to the upper edge and the lower edge of a column beam joint of a steel frame embedded in a precast prestressed steel frame reinforced concrete beam, and fixes one end to each of the fixing metal articles and a steel concrete column or steel reinforced concrete Pre-cast prestressed steel reinforced concrete beam column beam joint characterized by arranging a PC steel material that fixes the other end on the opposite side of this steel concrete column or steel reinforced concrete column or the anchoring part of the next beam after passing through the column To provide a section. The steel-framed concrete columns or steel-framed reinforced concrete columns targeted by the present invention may be made of precast concrete or cast-in-place concrete.

[Action]

When a bending load is applied to the beam, maximum tensile (or compressive) force is generated at the upper and lower edges of the beam section. Therefore, it is reasonable to install the PC steel material that tightly connects the column and beam joints at the position farthest from the neutral axis of the beam.

However, in the structure of the conventional precast prestressed steel frame reinforced concrete beam, it is difficult to provide the PC steel anchorages on the upper and lower surfaces of the precast concrete by providing the PC steel material of the column-beam joint near the upper and lower edges of the beam cross section. It is also difficult to dispose the sheath on the concrete surface layer, and in order to overcome such difficulties, the structure of the beam must be made extremely complicated. Connection construction with was not easy either. Therefore, in the past, as explained in FIG. 2, the PC steel material for tightly connecting the column-beam joints was provided on the side surface of the cross section of the beam.

The present invention, in combination with the advent of the synthetic slab structure, provides the fixing positions of the PC steel material of the beam-column joints of the beam on the upper and lower surfaces of the steel frame of the beam, and covers it with the post-filling concrete together with the construction of the synthetic slab. In this way, the beam was placed at the position farthest from the neutral axis of the beam, so it became the most mechanically rational structure.

〔Example〕

FIG. 1 shows the structure of the joint portion of the embodiment of the present invention.
(A) is a plan sectional view, (b) is a side sectional view, and (c) is a front sectional view. The joint portion of the precast prestressed steel-framed reinforced concrete beam 1 is a joint part that joins the steel frame 3 of the beam to the steel frame or the steel frame 5 of the steel-framed reinforced concrete column 2 with a plank 4, and a fixing part 10 provided on the upper edge of the steel frame 3, It has a fixing portion 10 provided at the lower edge of the steel frame 3. These fixing parts 1
As shown in FIG. 1 (b), fixing hardware 9 is attached to the upper edge and the lower edge of the steel frame 3 of the beam to form a PC steel fixing portion. One end is fixed to each of the fixing units 10 and 10.
The PC steel materials 11 and 11 are configured such that the other ends thereof are fixed to the fixing portions 12 and 12 on the surface of the pillar 2 opposite to the steel frame 5. In the fixing parts 12 and 12, the PC steel material 1 is attached to the steel frame 5 of the steel frame or the steel frame reinforced concrete column without providing the fixing hardware.
Fix 1 and 11.

The procedure for constructing this joint is as follows.

The beam 1 is lifted up, and the steel frame 3 of the joint is joined to the steel frame 5 of the column 2 by using the eye plate 4. Next, the PC steel materials 11 and 11 are inserted through the pillar 2 and the ends thereof are locked to the fixing portions 10 and 10 of the beam 1.

Next, the synthetic slab 15 is placed on the beam 1, the concrete of the beam joint portion and the upper concrete 14 of the synthetic slab are cast, and after hardening, the PC steel materials 11, 11 are tensioned using the jack.

Then, the concrete notch of each anchorage is filled with the post-filling concrete 13 to complete the skeleton work.

When the column 2 is an intermediate column, a beam (not shown) sandwiching the beam 1 and the column 2 and a beam symmetric with respect to the column 2 are separately provided to the column 2 respectively.
It may be fixed on the two columns on both sides facing each other across the column 2.
The PC steel material 11 may be fixed between the fixing portions of the beams. In this case, a supporting portion for supporting the reaction force of the jack when the tension is applied to the PC steel material 11 may be set in advance on one of the beams.

〔The invention's effect〕

The structure of the column-beam joint portion of the precast prestressed steel-framed reinforced concrete beam of the present invention is such that when a bending load acts on the beam, the maximum tension (or compression) is exerted on the upper and lower edges of the beam cross section.
Power is generated. The PC steel material that tightly connects the column and beam joints is provided at the position farthest from the neutral axis of the beam, and prestress is applied to the beam cross-sectional position where maximum stress acts. Therefore, it is mechanically rational and contributes to the rationalization of construction work together with the adoption of synthetic slabs.

[Brief description of drawings]

FIG. 1 shows the joint portion of the joint structure of the precast prestressed steel frame reinforced concrete beam of the present invention,
(A) is a plan sectional view, (b) is a side sectional view, (c) is a front sectional view, and FIG. 2 is a front sectional view of a conventional beam-column joint portion. 1 ... PC beam, 2 ... Column 3 ... Beam steel frame, 4 ... Eye plate 5 ... Column steel frame, 9 ... Fixing hardware 10 ... Fixing part, 11 ... PC steel 12 ... Fixing part, 13 ... Backfill concrete 14 ... Top concrete

Claims (1)

[Claims] 1. A precast prestressed steel-framed reinforced concrete beam embedded with anchorages at the upper and lower edges of a column-column joint of a steel frame, and one end of each of the anchorages is anchored to a steel-reinforced concrete column or steel-reinforced concrete Pre-cast prestressed steel reinforced concrete beam column beam joint characterized by arranging a PC steel material fixing the other end to the opposite side of the steel concrete column or the steel reinforced concrete column through the column or to the anchoring part of the next beam Department.