JPH0375701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a technique for continuously erecting a plurality of PC beams (precast concrete beams) over a plurality of spans.

[Problem to be solved by the invention and its characteristics] Conventionally, when constructing a plurality of PC beams between pillars arranged in a row, a sheath buried in the ends of the PC beams of adjacent spans was replaced with a sheath buried in the pillars. A PC for bonding is inserted between these sheaths.
A prestressed beam is joined to a column by tensioning the steel material and fixing both ends to the ends of a prestressed beam in an adjacent span. This includes the problem that the introduction of prestress cannot be expected.
In addition, the PC steel material for joining inserted into the sheath of the column is
It is also possible to tension and fix the beam by connecting it to the prestressing steel of the beam, but this method has the disadvantage of being inferior in workability because it involves the work of connecting the prestressing steel.

In view of the above-mentioned points, the present invention aims to provide a new construction method that allows multiple PC beams to be erected in a continuous state by joining them to columns using long PC steel materials that do not connect them, and a PC for this method.
The present invention is intended to provide a beam, and its structural features are as set forth in the claims above.

The present invention is particularly suitable for constructing the frame of a building such as a store with a large floor area. The required framework can be constructed within the construction period.

(Explanation based on drawings) In Figs. 1 and 2, numerals 1 are pillars arranged in rows at predetermined intervals, and these may be made of either PC or RC construction. A sheath as described below is buried in the column 1 in advance, and a bracket 3 is provided on the side of the column to support the end of the PC beam during temporary installation, but this bracket 3 is formed integrally with the column 1. It does not matter whether it is made into a separate piece or removed after the PC beam 2 is erected.

Both ends of the PC beam 2 have a rectangular cross section as shown in Figure 3A, but one side of the central part has a notch 4 over an appropriate length, and the cross section of this part is L as shown in Figure 3B.
It is in the shape of a letter or, as shown in Figure C, an inverted L-shape. In one side of the PC beam 2, sheaths 5, 5 are buried in a predetermined arrangement over the entire length, while on the other side (the side where the center part is cut out 4).
Sheaths 6, 6 are embedded only at both ends.

By using the construction method of the present invention, the above-mentioned structure is created between the pillars 1, 1, etc. arranged in a row as shown in Figures 1 and 2.
To construct PC beam 2 in a continuous state, first, each PC
Beam 2 is supported by bracket 3 and temporarily installed between adjacent columns 1, 1, but at this time, the beam 2 is supported by bracket 3, but in this case, the
As shown in Fig. 1, the PC beams 2, 2 are arranged so that the sides with the notches 4 face in opposite directions.

In this state, the sheath 5 of one PC beam 2
and 6 are opposite to the sheaths 6 and 5 of the other PC beam 2 across the column 1, so a sheath that will be interposed between the opposing sheaths is buried in the column 1 in advance, and By applying appropriate means to connect the respective sheaths of the column 1 and the PC beam 2 at the joint between the column 1 and the PC beam 2, the sheath 5 of each PC beam 2 is connected to the sheath of each one end of the PC beams 2, 2 of both adjacent spans. Connects to 6,6.

Therefore, the PC steel material 7 is inserted through this continuous sheath, joint mortar is applied, and after it hardens, the PC steel material 7 is tensioned and its both ends are fixed to one end of each of the PC beams 2, 2 of both adjacent spans. death,
Furthermore, mortar grout is applied inside the sheath,
At this time, the work of inserting, tensioning, and fixing the PC steel material 7 and the grouting work of mortar are performed from above if the center part of the PC beam 2 has an L-shaped cross section, and from below if the center part of the PC beam 2 has an inverted L-shaped cross section. conduct.

The above is the present invention, and if this is applied to the rows of vertical and horizontal columns 1 as shown in FIG. 1, a strongly integrated frame will be formed. The plurality of PC beams 2 are arranged so that the notched sides 4 are in the same direction around the column 1, and the directions are opposite for the adjacent columns 1. Furthermore, although it is not necessary to make the vertical and horizontal intervals between the pillars 1 equal, it goes without saying that if they are made equal, there is an advantage that only one type of PC beam 2 and one type of PC steel material 7 are required.

In addition, PCs installed vertically and horizontally as described above
The floor slab installed on the frame formed by the beam 2 may be made of either a PC structure or a RC structure, as shown by reference numerals 8 and 9 in FIGS. 4 and 5, respectively. In the case of PC construction, there is a stepped section on one side of the PC beam 2, as shown in Figure 4.
0 is provided, both ends of the floor slab 8 are supported by the stepped portions 10, and the floor slab 8 is installed so that its upper surface is flush with the upper surface of the PC beam 2. At this time, the center part has an L-shaped cross section. In the case of Figure A, which uses a PC beam 2 that is This is not necessary in the case of Figure B, which uses the PC beam 2. Also, R.C.
In the case of PC beam 2, as shown in Figure 5 A and B,
Since it is sufficient to form the floor slab 9 all over the upper surface of the floor slab 9, the above-mentioned distinction does not occur.

(Effects) Since the present invention is as described above, according to the construction method, a plurality of PC beams are firmly connected to columns with long PC steel materials extending over the entire length of each PC beam, and are erected in a continuous manner. Moreover, since it does not involve connection work of prestressing steel materials, it has good workability. Moreover, according to the PC beam, not only can the above-mentioned construction method be carried out efficiently, but also it is possible to form a continuous beam that is structurally comparable to conventional beams.

[Brief explanation of drawings]

Fig. 1 is a horizontal sectional view showing the construction of a PC beam using the construction method of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a sectional view of the ends and center of the PC beam of the present invention, and Fig. 4 is a sectional view of the PC beam of the present invention.
The figure is an explanatory diagram when the floor slab is made of PC construction.
The figure is also an explanatory diagram of the case of RC construction. In the figure, 1...column, 2...PC beam, 5, 6...sheath,
7...PC steel material.

Claims (1)

[Claims] 1. A plurality of PC beams each having a sheath embedded therein over the entire length on one side and only at both ends on the other side,
One side and the other side are alternately reversed, and both adjacent spans are temporarily installed between columns lined up in a row, and the sheath on one side communicates with this sheath through the sheath embedded in the column. and the sheath on the other side of the PC beam,
Each PC beam is joined to the column by inserting the PC steel material, tightening the PC steel material after the joint mortar has hardened, and fixing both ends to the ends of the PC beams of both adjacent spans. Continuous erection method of PC beams. 2. Both ends are square in cross section, and the center part is L-shaped or inverted L-shaped in cross-section, extending over the entire length on one side, and only at both ends on the other side.
A PC characterized by having a sheath embedded in each.
Beam.