JP3773131B2 - Beam reinforcement of precast concrete beam members - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for arranging beam main bars of a PC beam member when a reinforced concrete structure is constructed using a precast concrete beam (hereinafter referred to as a PC beam) member.
[0002]
[Prior art]
In the conventional construction method built pillars at predetermined positions to set the P C beam member. In the PC beam member, an L-shaped reinforcing bar and a main beam of the beam were built in, and the main beam of the beam was overlapped or pressed.
[0003]
[Problems to be solved by the invention]
Since the length of the reinforcing bar that can be transported is determined, a joint is always required. The work of the pressure welding joint is a work in a narrow place, the workability is poor, and sometimes a defective part is formed.
Also, the lap joint is disadvantageous in terms of stress because the lap bars are driven up.
[0004]
Further, the wedge of the fixing bracket for fixing the beam reinforcing bar to the end portion of the beam member is small, and stress concentrates on a part of the reinforcing reinforcing bar to damage the surface, thereby causing a cross-sectional defect.
The present invention has been proposed in view of the problems of the prior art, it is an object of a reinforcement method of the beam main reinforcement of PC Beams are improved workability, beams PC beam members The object is to provide a bar arrangement method that does not damage the main muscles when adjusting the tension of the main bars and at the time of tension and fixation of the beam main bars.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the precast concrete beam member reinforcing bar arrangement method according to the present invention, precast concrete having fixing metal fittings for fixing a tension wire used as a beam main reinforcing bar at both ends. A beam member is manufactured, a plurality of the precast concrete beam members are set in series at the site, a plurality of the precast concrete beam members set in series are inserted into a long tension wire, and are strained. tension wire material for, is to fix the fixing bracket with both ends of each of the plurality of the precast concrete beam member.
[0006]
Further, in the precast concrete beam member according to the present invention, the beam main bar arrangement method includes, as the fixing bracket , an anchor main body having a tension wire rod through hole and a threaded portion on an outer peripheral surface, and the tension main body of the anchor main body. is KusabiIri the wire through hole, and a distal wedge wedging of the tensioning wire material formed by chamfering the piece, the outer peripheral surface threaded portion of the anchor main body is configured more and nut type bearing capacity plate to be screwed A fixing bracket is used .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS The most preferred embodiments of the present invention shown in the drawings will be described below.
According to the bar arrangement method according to the present invention, first, the PC beam member 2 having a U-shaped cross section having fixing metal fittings for fixing a tension wire used as a beam main bar at both ends is manufactured.
Further, on the site, a pillar 1 is erected at every predetermined position , and a PC beam member 2 having a U-shaped cross section is installed between the pillars 1. At this time, as shown in FIG. 1, a plurality of PC beam members 2 are set in series. Each of the PC beam members 2 includes an L-shaped barb 3 and a temporary auxiliary bar 4. In the figure, 5 is a column main reinforcement.
[0008]
As the beam main bar of the PC beam member 2 having a U-shaped cross section, a tension wire 7 made of a wire such as a steel wire, carbon fiber, aramid fiber, or glass fiber is used, and the tension wire 7 is long. It is composed of a single wire, and is mounted on the drum 6 as it is long and carried to the work site. The drum 6 is suspended as shown in the figure, or the drum 6 is carried and placed on the construction base surface or the like. Thus, the tension wire 7 is unwound from the drum 6 and inserted into the plurality of PC beam members 2 set in series to be tensioned , and the tension fixing bracket attached to the ends of the plurality of PC beam members 2. Fix to 8.
[0009]
FIGS. 3 to 8 show an embodiment of the fixing metal fitting. An outer peripheral threaded portion 9a of the screw type anchor 9 is screwed into the nut type pressure plate 10 and a wire rod for tension is inserted into the tapered hole 9b of the screw type anchor 9. FIG. A plurality of wedge pieces 11 for holding 7 are wedged. Note above the tip 11a of the wedge piece 11 so as not to rise to partial loss of the tension wire material 7 by scratches tension wire for 7 Kusabihen tip, rounded chamfered portion.
[0010]
Therefore, the tension force of the tension wire 7 can be easily adjusted by loosening or tightening the screw anchor 9.
Also the adhesion area between the wedge piece 11 is small, bearing capacity according to the tension wire material 7 becomes large, since the strain on the narrow portion of the tensioning wire material 7 such tension wire material by increasing the wedge piece 11 The adhesion area with 7 was increased.
[0011]
【The invention's effect】
As described above, the present invention manufactures a precast concrete beam member having fixing metal fittings at both ends for fixing a tension wire used as a beam main reinforcing bar , and sets a plurality of the precast concrete beam members in series on the site. Then, by inserting a long tension wire into the plurality of precast concrete beam members set in series and tensioning them, the main beam of the multiple span beam members is arranged with one wire. Thus to be a beam longitudinal reinforcement composed of the installed wire thus is fixed to a fixing bracket which is attached to both ends of each of the plurality of the beam members, tension to One of the beam member not a 1 span Given.
[0012]
Thus luck transportable beams main reinforcement consisting of tensioning wire material according to the present invention remains long, carrying becomes possible, handling is simplified, distribution beams main reinforcement of the beam members of the plurality span single wire rod can muscle, through a fixing bracket attached to the end of the beam member, given tension to the beam member of one span, pressure beam main reinforcement, splice, etc., together with the work required for the joint can be omitted, the beam The main muscle material can be minimized.
[0013]
The fixing bracket beam main reinforcement of the precast concrete member used in the present invention have tensions wire material for the through-hole, the anchor main body having a threaded portion on an outer peripheral surface, inserting the tension wire material for penetrations holes of the anchor main body a wedge stop wedge piece tension wire material that is, since the outer peripheral surface threaded portion of the anchor main body is more configuration and nut type supporting plate that will be screwed, required pressure of the beam main reinforcement, the joint such as splicing The work can be omitted and the material of the main beam of the beam can be minimized. Further, the tension of the tension wire can be easily adjusted by the screw anchor.
[0014]
In addition, the length of the wedge piece can be increased to increase the adhesion area with the tension wire , and the tip of the wedge piece can be chamfered to damage the tension wire at the tip of the wedge piece. It is possible to prevent cross-sectional defects of the wedge pieces.
[Brief description of the drawings]
FIG. 1 is a column beam assembly conceptual diagram showing the reinforcement of a main beam of a PC beam member according to the present invention.
2 is a cross-sectional view of a section U-shaped PC beam members.
FIG. 3 is a plan view of a fixing bracket.
FIG. 4 is a view taken along the line AA ′ in FIG. 3;
FIG. 5 is a longitudinal sectional view of a fixing bracket.
6 is a view taken along the line XX ′ of FIG.
FIG. 7 is a view taken along the line YY ′ of FIG.
FIG. 8 is an enlarged view of a portion Z in FIG.
[Explanation of symbols]
1 Column 2 PC Beam Member 3 L-Shaped Reinforcement 4 Temporary Auxiliary Bar 5 Column Main Bar 6 Drum 7 Tension Wire (Beam Main Bar)
8 Fixing bracket for tension 9 Screw-type anchor 9a Screw part 10 Nut-type bearing plate 11 Wedge piece 11a Wedge piece tip

Claims (2)

Produce precast concrete beam members with fixing brackets on both ends to fix the tension wire used as the main beam of the beam,
A plurality of the precast concrete beam members are set in series on site ,
A plurality of the precast concrete beam members set in series are inserted into a long tension wire and are tensioned.
The tense the tensioning wire material, fixed on the fixing bracket with both ends of each of the plurality of the precast concrete beam member,
A beam reinforcement method for a precast concrete beam member. As the fixing bracket, an anchor main body having a tension wire rod through hole and having a threaded portion on the outer peripheral surface, and the tension wedged in the tension wire through hole in the anchor main body and having a chamfered tip. and wedge sealing wedge piece use wire, precast concrete beam according to claim 1, wherein the outer peripheral surface threaded portion of the anchor main body is characterized by using a fixing bracket which is configured more and nut type bearing capacity plate to be screwed Reinforcement method for beam main bars of members.

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