JPH02104832A - Joint construction of precast pre-stressed steel frame reinforced concrete beam - Google Patents

Abstract

PURPOSE:To rationalize a joint construction of beams dynamically and, at the same time, to enable construction work by providing anchoring hardwares to the upper and lower edges of a steel frame buried to a PC beam and arranging PC steels between the anchoring hardwares. CONSTITUTION:In a joint section of a PC beam, anchorages 10, 10, 12 and 12 are respectively mounted to the upper and lower edges of a beam steel frame 3 buried to the beam 1. After that, PC steels 11 and 11 are arranged, one end of each of them is anchored to each of the anchorages 10, 10, 12 and 12, and the other end is anchored to each of the anchorages 10, 10, 12 and 12 of the opposite or next beam 1 after passing through a column 2. According to the constitution, the PC steels 11 and 11 can be functioned rationally in the upper and lower edges of the beam 1 in which the maximum tensile force or the maximum compressive force against bending load occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial f:I field] The present invention relates to a joint structure of a precast prestressed steel reinforced concrete beam.

[Prior Art] Conventionally, in the Shiguchi III construction of precast prestressed steel reinforced concrete beams, as shown in Fig. 2, PC steel members 11 are provided on the side of the beam to connect the beam 1 including the steel frame 3 and the column. The beam and column were rigidly connected with tension using PC steel material 11.

Recently, a method of constructing a slab by placing a precast composite slab on a beam has developed, and with this, the steel frame 3 inside the beam
A prestressed steel-frame reinforced concrete beam has emerged in which a beam with an exposed top flange is used and the top flange of the steel frame 3 is embedded in concrete during construction of a composite slab.7 [Problems to be Solved by the Invention] The present invention In the joint structure of precast prestressed steel reinforced concrete beams as described above, we create a joint structure different from conventional joints, and provide a mechanically rational structure that is easy to construct. .

[Means for Solving the Problems] The present invention attaches fixing hardware to the upper and lower edges of the steel frame embedded in the beam at the joint part of a precast prestressed steel reinforced concrete beam.

A precast prestressed steel reinforced concrete beam characterized by having one end fixed to each of the fixing hardware, and a PC steel material passing through the column and fixing the other end to the opposite side of the column or the fixing part of the next beam. It has a Shiguchi structure.

r action] When a bending load is applied to a beam, maximum tensile (or compressive) force is generated at the upper and lower edges of the beam cross section. Therefore, it is reasonable to provide the PC steel material that connects the joint at the farthest position from the neutral axis of the beam.

However, in the conventional beam structure, installing the PC steel material for the joint near the bottom edge of the beam cross section complicates the structure and is not easy to construct. Coupled with the advent of this new structure, it has become a structure that is logically logical and extremely easy to construct.

[Example] Figure 1 shows the structure of the joint part of an example 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 part of the precast prestressed steel reinforced concrete beam 1 includes a joint part where the steel frame 3 is connected to the steel frame 5 of the column 2 with the batten 4, an anchor part IO provided at the upper edge of the steel frame 3, and a joint part at the lower edge of the steel frame 3. It has a fixing section lO provided therein.

The PC steel materials 11.11 each have one end fixed to the fixing portion 1O11O, and the other end thereof is fixed to the opposite side of the steel frame 5 of the column 2 by a fixing plate 12.

The construction procedure for this joint section is as follows.

The beam 1 is lifted, and the steel frame 3 of the joint part is connected to the steel frame 5 of the column 2 using battens 4. Next, it passes through the pillar 2 and the PC steel material 11.
li is inserted, and its tip is locked to the fixing portion 1O110 of the beam l.

Next, the composite slab 15 is placed on the beam 1, and the concrete at the beam joint and the upper concrete 14 of the slab are poured, and after hardening, the PC steel material 11 is tensioned using jacks.

Next, the concrete cutout portions of each anchoring portion are filled with post-filling concrete 13, and the frame work is completed.

If the column 2 is an intermediate column, the beams 1 sandwiching the column may be fixed to the column separately, or the beams 1 on both sides of the column 2 may be fixed to the column separately.
It is also possible to have a structure in which the PC steel material 11 is fixed between the respective fixing parts of the PC steel material 11. In this case, a support part that supports the reaction force of jacking when tension is applied to the PC steel material 11 is set in advance on one of the beams l. You should do it.

[Effect of the Invention J The joint structure of the precast prestressed steel reinforced concrete beam of the present invention is mechanically rational and easy to construct, and together with the use of synthetic slabs, it contributes to the rationalization of construction work.

[Brief explanation of the drawing]

Figure 1 shows the joint part of the joint structure of the precast prestressed steel reinforced concrete beam of the present invention, (a
) is a side sectional view, (b) is a plan view, (C) is a front sectional view, and FIG. 2 is a front view of a conventional joint section. ■... PC beam 2... Column 3... Steel frame of beam 4... Batten 5... Steel frame of column
IO... Anchoring part 11... PC steel material 12 Fixed part 13... Post-filling concrete 14... Upper concrete

Claims (1)

[Claims] 1. At the joint part of a precast prestressed steel reinforced concrete beam, fixing hardware is attached to the upper and lower edges of the steel frame embedded in the beam, and one end of each is fixed to the fixing hardware, passing through the column, and A joint structure of a precast prestressed steel reinforced concrete beam, characterized in that a prestressed steel reinforced concrete beam is provided with a PC steel material that fixes the other end to the anchoring part of the next beam.