JPH01137032A - Method of lap joint construction of main reinforcement in post and beam joining section - Google Patents

Abstract

PURPOSE: To facilitate the execution work of the joint section of a main reinforcement and to increase structural safety by connecting a beam structural body and lateral reinforcing members made of an integral closed iron plate or reinforcing bar. CONSTITUTION: Half-PC beam bodies 1a-1d are located above a lower column body 10, an intersection 3 of these beam bodies 1a-1d is lowered from above the column main reinforcements 12 of the lower column body 10, and the column main reinforcements 12 are surrounded by lateral reinforcing members 4 made of a closed iron plate of the half-PC beam bodies 1c, 1d. An upper PC column body 20 is suspended upward and is lowered at the intersection 3 of the beam bodies 1a-1d, column main reinforcements 21 protruded downward from the upper PC column body 20 are inserted into the lateral reinforcing members 4, and the upper end sections of the column main reinforcements 12 of the lower PC column body 10 are inserted into a lateral reinforcing members 23 fitted to the lower section of the upper column body 20. The column main reinforcements 12 and the column main reinforcements 21 are adjacently lap- connected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lap joint construction method for main reinforcing bars at a column and beam joint.

(Prior art) Conventionally, in the construction method of reinforced concrete structures in which columns and beams are integrally joined, in order to connect the main reinforcement of the column body to each other, it is necessary to: - make a lap joint for each single reinforcement; At present, a pressure welding joint is used.

(Problem to be solved by the invention) For this reason, such conventional construction methods have very poor work efficiency, and furthermore, there are problems with the position of reinforcing bars, the length of overlapped parts, or the arrangement of horizontal reinforcement at overlapped joints. However, not only is it not possible to obtain satisfactory results in terms of quality assurance and construction management, but also, for example, it is difficult to connect the main reinforcement of a precast concrete (hereinafter abbreviated as PC) column by pressure welding or welding. In some cases, there was a problem in that construction could not be carried out even in slight rainy weather, and it was also impossible to connect all the reinforcing bars at the same time as a reinforcing bar cage.

In addition, when joining individual reinforcing bars by pressure welding, welding, etc. in this way, a highly skilled and highly skilled technique is required, and the working time is also long.

Furthermore, when connecting column main reinforcements with mechanical joints such as screws or grips, it is not suitable to connect all the main reinforcements at the same time as a reinforcing bar cage, and moreover, the number of parts to be assembled increases, which increases costs. , there were various problems.

The present invention was made under the above-mentioned circumstances, and its purpose is to provide a column and a structure that facilitate the construction of joints of main reinforcements and improve structural safety. The object of the present invention is to provide a method for lap jointing main reinforcement at beam joints.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method for forming a beam structure consisting of 20 members or assembled reinforcing bar members in advance at a joint position with a column main reinforcement. The beam main reinforcement is continuously extended and a horizontal reinforcing member made of a closed steel plate or reinforcing bar is integrally connected to the beam structure at the specified position, and the beam structure is covered with concrete that has already been poured to the bottom of the beam. The beam structure is installed above the lower column so that the horizontal reinforcing member surrounds the main column reinforcement that descends from above the lower column and projects from the upper end of the lower column, Next, a column structure consisting of 20 pre-formed members or prefabricated reinforcement members for the upper column body is lowered from above, and the column main reinforcement that protrudes downward from the column structure is installed in the horizontal reinforcing member, and the lower part It is made to overlap and join with the column main reinforcement that projects upward from the column body.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 and 2 show half-PC beams 1a to 1d assembled in pairs on the front, back, left, and right.
Beam bodies 1a, lb and half PC beam bodies 1c paired on the left and right,
The beam main reinforcements 2 are continuously extended in each of ld, and these half P
The intersection parts 3 of the C beams 1a to 1d are the parts that connect with the columns described later, and this part is a hollow part without concrete. The horizontal reinforcing members 4 are integrally connected to the main beam reinforcing bars 2 at appropriate intervals vertically. Top beam main reinforcement 2
protrudes upward from the concrete surface and is connected to other beam main reinforcements via stirrup reinforcements 5.

FIG. 3 shows a lower column 10 made of reinforced concrete. This lower column 10 is erected with concrete 11 poured up to the bottom of the beam, and a column main reinforcement 12 is protruded from its upper end. The beams extend beyond the upper surfaces of the beam bodies 1a to 1d to be joined.

Further, FIG. 4 shows an upper PC column 20 made of reinforced concrete. At the top and bottom of this upper PC column 20, column main reinforcements 21 protrude upward and downward from the concrete body 22, respectively. The amount of downward protrusion of these column main reinforcements 21 is Beam bodies 1a to 1d to be joined
A horizontal reinforcing member 23 for shear reinforcement made of a closed iron plate is welded to the upper part of the column main reinforcement 21, which is formed to be sufficiently larger than the height of the main reinforcement 21 and projects downward.

In carrying out the method according to the present invention, the half-PC shown in FIGS. 1 and 2 is placed above the lower column 10 shown in FIG.
The beam bodies 1a to 1d are positioned, and the intersection portion 3 of the beam bodies is lowered from above the main column reinforcement 12 of the lower column body 10, as shown in FIG. Next, the upper PC column 20 shown in FIG. 4 is suspended upward, and the intersection portion of the beam is 3, the column main reinforcement 21 protruding downward from the upper PC column 20 is inserted into the horizontal reinforcing member 4 of the half PC beam, and the upper end of the column main reinforcement 12 protruding upward from the lower PC column 10. A horizontal reinforcing member 23 made of a closed iron plate attached to the lower part of the upper column 20
Insert and install inside.

As a result, as shown in FIGS. 6 and 7, the main column reinforcement 12 projecting upward from the lower column 10 is overlapped adjacent to the main column reinforcement 21 projecting downward from the upper column 20. Thereafter, necessary forms are placed at the joints of the columns and beams that have been overlapped as described above, and concrete is poured, thereby integrating the joints of the columns and beams.

In addition, in the above-mentioned example, the beam body and the column body are 20
Although the case where it is formed from members has been described, the present invention is not limited to this, and can also be applied to joining reinforcing bar cages using a general on-site concrete placement method. However, in this case as well, in the case of the lower column, the concrete will be stopped under the beam.

Further, in the above embodiments of the present invention, the horizontal reinforcing member 4 attached to the beam body is formed from a closed iron plate, but it may also be formed from a closed reinforcing bar.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist thereof.

(Effects of the Invention) As described above, in the lap joint construction method of main reinforcement at the column and beam joint according to the present invention, the horizontal reinforcing member made of closed iron plates or reinforcing bars is integrally connected to the beam structure. , when the beam structure is assembled to the lower column and the column structure for the upper column is further assembled to this column-beam joint, a closed steel plate or reinforcing bar will be formed around the lap joint of the upper and lower column main reinforcements. This makes it extremely easy to attach the horizontal reinforcing member to the lap joint, making it easier to construct the joint, increasing work efficiency, and improving the overall strength of the lap joint. The length can also be shortened and costs can be reduced. In addition, since the overlap joint is located at the joint between a column and a beam, it is restrained by the surrounding beams and is also restrained by the horizontal reinforcing member for shear reinforcement provided at the joint between the main reinforcement of the column and beam. Since it can be restrained, structural safety can be improved, and since the concrete in this part is placed together with the slab, it has the excellent effect that concrete can be easily placed.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of a half-PC beam body used in the present invention, Figure 2
The figure is a plan view of the semi-PC beam shown in Figure 1, Figure 3 is a front view of the lower column, Figure 4 is a front view of the upper column, and Figure 5 is the lower column constructed using the construction method of the present invention. 6 is a front sectional view showing the state in which the upper column body is installed on the lower column body in the state shown in FIG. 5, and FIG. It is a sectional view taken along the line ■-■. 1a to 1d...Semi-PC beam body 2...Beam main reinforcement 4.23...Horizontal reinforcement member 1
0... Lower column body 12, 21... Column main reinforcement 20.
・Upper PC column

Claims (1)

[Claims] When forming a beam structure in advance, the main beam reinforcement is continuously extended at the part that will be connected to the column main reinforcement, and at that position, a horizontal reinforcing member made of a closed steel plate or reinforcing bar is integrated with the beam structure. The beam structure is descended from above the erected lower column with concrete poured to the bottom of the beam, and the column main reinforcement that protrudes from the upper end of the lower column is surrounded by the horizontal reinforcing member. The beam structure is installed above the lower column body so that the column structure previously formed for the upper column body is lowered from above, and the column main reinforcement that protrudes downward from the column structure is installed. A method of lap jointing main reinforcements at a column and beam joint, characterized in that the main reinforcements are installed in a horizontal reinforcing member and are overlapped with the main column reinforcements protruding upward from the lower column body.