JPH04198534A - Jointing method with column and beam in precast reinforced concrete structure - Google Patents

Abstract

PURPOSE:To enable a column and beams to be integrally jointed to each other by providing the column head upper surface central-section of the PC column, with a notched section in the X direction or the XY direction, and by bending setting sections downward at the end section tips of the PC beams, to place joint concrete after the setting sections are inserted into the notched section. CONSTITUTION:On the column head section upper-end central-section of a PC column 1, a notched section 2 in the X direction except mounting sections for mounting PC beams 3 on is set. Then, at the end section tips of the PC beams, the setting sections 4 of beam bottom main-reinforcements are arranged to be bent downward. After that, the setting sections 4 of the PC beams 3 are inserted into the notched section 2 of the PC column 1, and after that, in the notched section 2, joint concrete is placed. As a result, the PC column 1 and the PC beams 3 can be integrally jointed to each other.

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to columns in precast reinforced concrete construction,
This relates to the method of joining beams.

(Prior art) Conventionally, in this type of column/beam joining method, the tip anchoring part C, which rests on the main reinforcement at the lower end of the beam mounted on the capital of column a, is bent in two directions. Then, the column-beam joint concrete 1- is poured. (See Figure 5) Also, the anchorage length of the main beam reinforcement d at the outer end of the top floor! In order to ensure this, we have responded by increasing the size of the container.

(See Figure 6) (Problem B to be solved by the invention) Since the main reinforcement at the lower end of the PC beam is fixed upward,
If the beam size is small, it will not be possible to establish the inner part of the shiguchi.

In addition, if the column dimensions are small, the tip anchoring parts of the lower end main reinforcement in both X7 directions will gather in a small joint core part, which will cause problems in concrete filling work.

For this reason, precast reinforced concrete structures are often abandoned for housing.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to reduce the beam size and improve the filling properties of column-beam joint concrete in precast reinforced concrete structures. The point is that it provides a method for joining columns and beams.

(Means for Solving the Problems) In order to achieve the above object, according to the method for joining columns and beams in precast reinforced concrete construction according to the present invention, , or by forming a notch in the center in the XY force direction, inserting the downwardly bent fixing part of the lower main reinforcement at the end of the PC beam into the notch, and inserting the joining concrete into the notch. The concrete is to be poured.

(Function) According to the present invention, a notch is formed in the center of the X direction or the XY force direction on the 11th θ:11 plane of the PC board with the beam formed or cut out,
The beam is mounted on the column head with the P'Jek mounting part in at least one direction as the mounting part, and the downwardly bent fixing part of the lower main reinforcement at the end of the beam is connected to the notch part. By inserting the concrete into the notch and placing joint concrete in the notch,
Since the anchoring portions of the top of the PC column and the tip of the main reinforcement at the lower end of the beam are restrained by the column hoop reinforcement, the PC column and beam are firmly integrated by the post-cast concrete portion.

(Example) The present invention will be described below with reference to the illustrated embodiments.

1 is a PC column with the beam cut out on the top surface, and 3 as shown in Figure 3.
Recesses 2 are provided in the L and X directions, or in both the X7 directions as shown in FIG.

The anchoring part 4 at the tip of the main reinforcement at the lower end of the PC beam 3 is bent downward, and as shown in FIG. 1, the PC beam 3 is mounted on the column head of the PC column 1. By inserting the downward anchoring part 4 of the lower end main reinforcement of the PC beam 3 into the notch 2 of the PC column 1 and pouring it into the joint concrete 1 in the space, the top of the PC column 1 can be fixed. and the anchoring portion 4 of the lower end main reinforcement at the end of the PC beam 3 are restrained by the hoop reinforcement 5 exposed in the notch 2 of the column head of the PC column.
c Pillar 1 and PCC 84 are joined together. Note that 5 in the figure is the top of the slab.

According to the above embodiment, since the PC beam 3 can be anchored downward at the lower end main reinforcement or the column head, the beam thickness t can be reduced to a structurally necessary dimension, and the unreasonableness that the beam thickness is determined by the anchorage length can be avoided. It can be resolved. Also, by fixing one of the PC wires 3 in both X7 directions upward and the other downward, the concrete filling property of the column-beam joint is improved compared to the conventional method.

FIG. 2 shows an embodiment in which the present invention is applied to the connection of PC columns and beams at the outer end of the top floor. -1- The downward tip fixing part of the end main bar and the do end main bar is inserted into the blowing part 2 of the PC column 1, and a sufficient fixing effect is exhibited every time concrete is poured in the gap 2, This is because the beam size t of PC93 can be reduced. Note that 7 in the figure is the rib of the PC beam.

(Effects of the Invention) According to the present invention, a notch is provided in the column head of a PC column, and the anchoring portion of the lower end main reinforcement of the PC beam is bent downward, and the PC beam mounted on the column head is By inserting the fixing part into the recess and pouring the joining concrete 1~, the PC column and the beam are joined together, and the beam structure is determined only by the structurally necessary dimensions, This eliminates the unreasonable problem that the beam size is determined by the fixed length of the beam reinforcement, and the beam size can be reduced.

In addition, by setting the main reinforcement anchorage at the lower end of the PC beam installed in one direction at the column head facing downward, and the anchoring area of the IIC beam in the other direction facing downward, the column can be easily used in cases where the column cross section is small, etc.
This improves the filling properties of concrete at beam joints.

Thus, according to the present invention, the precast reinforced concrete construction method can be applied to buildings such as residences with low floor heights and relatively small column and beam dimensions.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the method for joining columns and beams in a precast reinforced concrete structure according to the present invention. FIG. 2 is a longitudinal sectional view showing another embodiment of the method of the present invention. FIG. 3 is a perspective view showing an embodiment of the column head of the PC column. FIG. 4 is a perspective view showing another embodiment of the column head of the PC column. FIG. 5 is a longitudinal cross-sectional view showing an example of the implementation of a conventional construction method. FIG. 6 is a longitudinal sectional view showing the implementation status of another example of the conventional construction method. (Explanation of rare numbers) 1 PC column 2 Notch part 3 [) Anchor part at the lower end reinforcement of C beam 49 Agent Patent attorney Shige Okamoto 1 outsider Figure 5

Claims (1)

[Claims] A notch is formed in the center of the upper end surface of the PC beam in the X direction or the XY direction, and the downwardly curved fixing part of the lower main reinforcement at the end of the PC beam is inserted into the notch. A method for joining columns and beams in precast reinforced concrete construction, which is characterized by inserting the column into the notch and pouring joining concrete into the notch.