JPH0461142B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a precast concrete (hereinafter referred to as PC) half beam that incorporates bending main reinforcing bars and H-shaped steel members.

(Conventional technology) Conventionally, the girder a was made of SRC and the satsushi had continuous windows.
When tiles are pasted on waist walls and descending walls, those parts often become waist wall-like PC boards b as shown in Figure 10. However, recently, as shown in FIG. 11, an omniar board c, which also serves as a formwork, has come to be used in this part.

(Problem to be solved by the invention) In the conventional structure described above, the girder a has a waist wall-like PC
Since it is located apart from and to the side of plate b and omnia plate c, an excess amount of concrete for the girder portion will be placed in the width direction.

(Means for Solving the Problems) The present invention was proposed in order to solve these problems, and it involves embedding H-shaped steel members in a concrete half-beam structure, and embedding vertical webs in the H-shaped steel members. The main bending reinforcements at the upper and lower ends located on one side of the beam frame are buried, and a part of the stirrup arranged surrounding each of the main bending reinforcements is made to protrude from the end surface in the width direction of the beam frame. That is.

(Function) As described above, in the present invention, the beam main body is a concrete half-beam, and the H-shaped steel is buried in the concrete half-beam, and is located only on one side of the H-shaped steel across the vertical web. The main bending reinforcements at the upper and lower ends are buried, and a part of the stirrup surrounding each main bending reinforcement is made to protrude from the end face in the width direction of the half-beam frame. By pouring girder concrete, the poured girder concrete is integrated with the half-beam frame through the stirrup protrusion, and the H-shaped steel members and the upper and lower pairs of bending main bars placed on the side thereof, SRC with built-in stirrup
A constructed girder is constructed, so there is no need to pour excess concrete in the width direction when constructing the girder. Furthermore, the half beam of the present invention can also be used as a formwork when constructing a girder, thereby simplifying construction.

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

In FIGS. 1 and 2, A is a waist wall-like PC half beam, and inside the half beam frame 1 there is a left half of an H-shaped steel 2, and the upper and lower bent main reinforcements 3, 3 on the left side of the H-shaped steel 2.
Also, a part of the stirrup 4 surrounding each of the main reinforcements 3 is built in, and the right half of the H-shaped steel material 2 and the tip of the stirrup 4 protrude from the end surface of the half-beam frame 1 in the width direction.

When the girder concrete 5 is poured in contact with the half-beam frame 1, the poured concrete 5 and the half-beam frame 1 are integrated via the H-shaped steel 2 and the protrusion of the stirrup 4, Built-in H-type steel 2, vertical bending main reinforcement 3, and stirrup 4
SRC girder B is constructed. C in the figure is a floor slab.

In this way, the half-beam frame 1 of the wall-shaped PC half-beam A and the post-cast girder concrete 5 are integrated to form the SRC.
Since the girder B is constructed, it is not necessary to pour excess concrete in the width direction, unlike in the conventional structure in which the waist wall-like PC board or omnia board and the SRC girder are arranged apart from each other. In addition, the half-beam frame 1 is also used as a formwork when pouring concrete for the SRC girder.

FIG. 3 shows a case where an Omnia board D which also serves as a formwork is used in place of the wall-like PC board, and in the figure, parts equivalent to those of the previous embodiment are given the same reference numerals. In this case, with respect to the H-shaped steel material 1, upper and lower end bending main reinforcements 3', 3' are arranged at positions symmetrical to the upper and lower end bending main reinforcements 3, 3 in the half-beam frame 1.

Note that the half beam A can be used when the descending wall is omitted as shown in Fig. 4, when there is no waist wall as shown in Fig. 5, or when both the descending wall and the waist wall are missing as shown in Fig. 6. In some cases.

In the drawings, parts equivalent to those of the above embodiments are given the same reference numerals.

In Figures 7 to 9, in order to fully demonstrate the function of the PC half-beam A that also serves as a formwork, the lower end horizontal part 1a is also made into PC, and the equivalent parts in the figures are the same as those of the above embodiments. A code is attached.

In the drawings, parts equivalent to those of the above embodiments are given the same reference numerals.

(Effects of the Invention) As described above, the PC half-beam according to the present invention has H-shaped steel members buried in the concrete half-beam frame, and the upper and lower ends of the H-shaped steel members are bent at one side across the vertical web. The main reinforcement is buried, and a part of the stirrup that surrounds each bending main reinforcement is built-in, and a part of the stirrup is made to protrude from the end face in the width direction of the half-beam frame, and the half-beam is connected to the half-beam through the protruding part of the stirrup. The SRC girder is constructed by integrating it with the girder concrete that is poured in contact with the building frame, similar to the case where the SRC girder and waist wall-shaped PC board or omnia board are placed and constructed separately. , there is no need to pour excess concrete in the width direction, and the half-beam frame can also be used as formwork when pouring concrete for SRC girders, simplifying construction.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view showing the usage status of one embodiment of the PC half beam according to the present invention, Fig. 2 is its front view,
3 to 9 are longitudinal cross-sectional views showing the usage states of other embodiments of the PC half-beam according to the present invention, and FIG.
Figures 1 and 11 are longitudinal sectional side views showing the positional relationship between a conventional SRC girder, a waist wall-like PC board, and an omniar board, respectively. A... Spandrel-shaped half beam, B... SRC girder, 1... Half beam frame, 2... H-type steel, 3... Bending main reinforcement, 4... Stirrup, 5... Girder concrete.

Claims (1)

[Claims] 1. Bury an H-type steel member in the concrete half-beam frame, and bury the upper and lower bent main reinforcements located on one side of the H-type steel material across the vertical web,
A precast concrete half beam characterized in that a part of the stirrup arranged surrounding each of the main bending reinforcements protrudes from the end face in the width direction of the beam frame.