JPH06158712A - Construction method of beam - Google Patents

Abstract

PURPOSE:To make easy and speedy execution of a beam by building a PC end outer beam member between reinforced concrete columns, and placing concrete in an outer beam member end channel section and around column reinforcing bars. CONSTITUTION:An end outer beam member 1 housing a beam reinforcing bar longitudinal lapping spacer 8 and joint reinforcing bars 7 is lifted by a crane and is built between two reinforced concrete columns. After that, a plurality of joint reinforcing bars 7 temporarily suspended around the upper part of the end outer member 1 are pulled out and, lowered to arrange them to the upper parts of lower beam main reinforcing bars 6 in an end channel part 3. Then, they are held by the beam reinforcing bar longitudinal lapping spacer 8, concrete 5 is placed around column reinforcing bars and inside the end channel part 3 and, at the same time, slab concrete is placed. According to the constitution, an amount of placement of the concrete 5 to a high place is reduced, and joint strength of the beam to the reinforced concrete columns can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a beam for a structure.

[0002]

2. Description of the Related Art Conventionally, as a method for constructing a beam, Japanese Patent Laid-Open No. Sho 62-62 is known.
As disclosed in Japanese Patent Laid-Open No. 117938, a precast concrete outer beam member having an upward opening groove shape over the entire length is erected over a reinforced concrete column, and concrete is laid in the outer beam member and around the column rebar. A method of setting is known.

[0003]

However, the conventional method of constructing a beam is complicated in that the amount of concrete placed at a high place is large. On the other hand, in the case where the entire surface of the beam is used as a factory member, a special method is involved in the joint of the reinforcing bars at the ends, and in this case as well, it is complicated.

[0004]

In order to advantageously solve the above-mentioned problems, in the method of constructing a beam according to the present invention, a precast concrete end portion outer beam member whose end portion has an upward opening groove section. 1 is erected over a reinforced concrete column 2, and concrete 5 is placed over the inside of the end groove portion 3 of the end outer beam member 1 and in the vicinity of the column reinforcing bar 4.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 4 to 8 show a precast concrete end portion outer beam member 1 used in an embodiment of the present invention.
In the inner peripheral surface of the end grooved portion 3 of the end outer beam member 1 having a solid middle portion and provided with end grooved portions 3 having upward opening groove shapes at both ends, A large number of frustoconical recesses 9 are provided in a zigzag manner at regular intervals and in series on the bottom surface, and a large number of frame-shaped shear reinforcing bars 10 are provided at the upper end of the end outer beam member 1. The outer beam member 1 is embedded and fixed at intervals in the longitudinal direction.

FIG. 9 and FIG. 10 show a beam bar vertical stacking spacer 8 used in an embodiment of the present invention, in which a round steel rod is bent in a U-shape to form a spacer body 11.
The plurality of spacer bodies 11 (three in the illustrated case) are fixed to the upper surface of the horizontal strip steel plate 12 by welding at intervals in the longitudinal direction of the strip steel plate.

Next, a method of constructing a beam using the precast concrete end portion outer beam member 1 and the beam reinforcement vertical stacking spacer 8 will be described. First, as shown in FIG. 1 and FIG. 2, the end outer beam member 1 containing the beam reinforcement vertical stacking spacer 8 and the joint reinforcement 7 is hung by a crane and installed over two reinforced concrete columns 2. Next, as shown in FIG. 3, the plurality of joint bars 7 temporarily suspended near the upper portion of the end portion outer beam member 1 are pulled out and lowered to the lower beam members in the end groove portions 3. Main line 6
It is held by the spacer 8 for vertical stacking of beam reinforcement so that it is located on the upper part of. Next, the concrete 5 and the slab concrete 13 are cast around the column reinforcing bars 4 and inside the end groove portions 3. In FIG. 3, 14 is the upper beam main bar and 15 is slab concrete.

[0008]

According to the present invention, a precast concrete end portion outer beam member 1 whose end portion has an upward opening groove-shaped cross section is erected over a reinforced concrete column 2,
Since the concrete 5 is cast in the end channel portion 3 of the end outer beam member 1 and around the column rebar 4, the amount of the concrete 5 to be cast in a high place can be reduced,
The construction of the beam can be carried out easily and quickly, and the middle part of the beam can be manufactured in a solid factory. On the other hand, the joining or anchoring of the end rebar can be done by conventional and conventional methods. Further, since the lower beam main reinforcement 6 does not project from the end portion of the end outer beam member 1, when the end outer beam member 1 is hoisted and transported, the lower beam main reinforcement 6 bumps against other members and becomes an obstacle, There is no fear that the end of the lower beam main bar 6 will bend, and the joint bar 7 extending from the column side into the end groove portion 3 is vertically stacked so that the joint bar 7 is located above the lower beam main bar 6. By holding it by the spacer 8 for use, the joint bar 7 can be correctly arranged on the upper part of the lower beam main bar 6, and the connection strength of the beam to the reinforced concrete column 2 can be increased. By making the middle part of the beam solid and making both ends upwardly grooved, it is possible to adjust the beam weight and make it suitable for the lifting function of the site. It becomes possible to make it. Further, according to the present invention, it is possible to easily form the fixing of the girder bridged over the girder in the girder, and such a girder has a weight closer to that of the girder, so that there is no waste of lifting. There is an advantage that it can be omitted.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which an end outer beam member is installed on a reinforced concrete column.

FIG. 2 is a partially longitudinal front view showing a state in which a joint bar is installed in the end outer beam member by using a beam bar vertical stacking spacer.

FIG. 3 is a vertical sectional front view showing the vicinity of a completed beam.

FIG. 4 is a partially cutaway perspective view showing an end portion outer beam member having a partially exposed shear reinforcing bar.

FIG. 5 is a partially cutaway side view showing an end outer beam member having a partially exposed shear reinforcing bar.

FIG. 6 is a side view showing a part of FIG. 5 in an enlarged manner.

7 is a cross-sectional view taken along the line AA of FIG.

8 is a sectional view taken along line BB of FIG.

FIG. 9 is a front view of a beam bar vertical stacking spacer.

FIG. 10 is a plan view of a spacer for vertically overlapping beam reinforcement.

[Explanation of symbols]

 1 Precast Concrete End Exterior Beam Members 2 Reinforced Concrete Columns 3 End Channels 4 Column Reinforcement 5 Concrete 6 Lower Beam Main Bar 7 Joint Bar 8 Beam Bar Vertical Stacking Spacer 9 Recess 10 Shear Reinforcing Bar 11 Spacer Body 12 Strip Steel 14 Upper beam main bar

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Katsuhiko Nakano 3-3-16-503 Nagayama, Tama-shi, Tokyo (72) Hirohisa Murayama 5-28-19 Kugayama, Suginami-ku, Tokyo (72) Inventor Kazu Uotani Ryo 2-2-17-105 Inaridai, Sakura City, Chiba Prefecture (72) Inventor Yoshitaka Hori 2-8-1, Fujimidai, Nagareyama City, Chiba Prefecture Verdomir Edogawadai 304 (72) Inventor Mikio Mihara Shirai Town, Inba District, Chiba Prefecture Root 66-4 Okisha Housing 202 (72) Inventor Nobuo Ichimura 2-5 Block Shibayama, Funabashi City Chiba 7-505 (72) Inventor Kazunori Maeda 3-17-13 Minamiyukinori Ichikawa City Chiba

Claims (2)

[Claims] 1. A precast concrete end portion outer beam member 1 having an upward opening groove-shaped cross-section at the end portion is erected over a reinforced concrete column 2, and inside the end groove portion 3 of the end outer beam member 1. And a method for constructing a beam in which concrete 5 is placed across the pillar reinforcement 4. 2. The lower beam main bar 6 of the precast concrete end portion outer beam member 1 is arranged so as not to project from the end portion of the end outer beam member 1, and the end of the end outer beam member 1 from the column side. The method for constructing a beam according to claim 1, wherein the joint bar 7 extending into the groove portion 3 is held via a beam bar vertical stacking spacer 8 so as to be located above the lower beam main bar 6.