JPH05230935A - Precase concrete made beam frame member - Google Patents

Abstract

PURPOSE:To provide a frame of beams made of precast concrete which can easily increase the sectional rigidity thereof and hardly brings buckling and further, ensures a large jointing area of the floor frame to increase safety on constructing. CONSTITUTION:In a frame member 1 of precast U-shaped concrete beams in which main reinforcing steel rods 3 of the lower side and stirrups 2 are buried, a horizontal flange 6 is formed at the upper side defining the upper opening 5. A reinforcing steel rod 7 is arranged in the longitudinal direction of the horizontal flange 6 opened outward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete beam form member used as a prefabricated construction method in a reinforced concrete structure or a reinforced concrete structure.

[0002]

2. Description of the Related Art In recent years, in the construction of reinforced concrete buildings, demands for shortening construction period, simplifying on-site work and labor saving are increasing, and various prefabricated constructions have been proposed to reflect such demands. .

Among them, as a prefabricated construction method using a precast concrete beam form member, one shown in FIG. 3 is known. This uses a precast concrete beam form member 1 manufactured in a U shape by embedding a lower end main bar 3 and a stirrup 2. Beam formwork member 1
Are placed with their ends facing each other, and the column-beam joints are appropriately jointed, and then concrete is placed in the beam form member 1.

At this time, the upper main rein to be the main beam of the beam is inserted into the upper end of the stirrup 2 which is the exposed portion, and the floor formwork and the floor rebar are carried out, and the floor concrete is poured to make the concrete for on-site construction. The floor is integrated with the precast concrete beam form member 1. In addition, a semi-precast concrete floor form member such as an omni board may be used for this floor form.

[0005]

By the way, when the precast concrete beam form member 1 is placed inside, the left and right side plates 1a escape in the out-of-plane direction so that the diameter of the upper opening 5 increases. As a result, buckling (buckling)
Is likely to occur.

[0006] Further, the floor formwork has its end placed on the upper end of the precast concrete beam formwork member 1, but it lacks stability because a sufficient supporting joint area cannot be secured.

Further, the precast concrete beam form member 1 supports the lower surface with a support as a support work,
It is assumed that this support is supported by the beam form member 1 at both ends and the center in the length direction.
Although an upper tensile force is generated at the upper end of the beam, a lower tensile force is generated at the intermediate portion, and the beam form member 1 itself is easily bent. Therefore,
If the pitch between the supports is large, the upper end of the beam form member 1 may be crushed.

The object of the present invention is to eliminate the disadvantages of the conventional example, to easily increase the sectional rigidity of the precast concrete beam form member, and to prevent buckling (buckling) from occurring. At the same time, it is an object of the present invention to provide a precast concrete beam form member capable of ensuring a large joint area of the floor formwork and improving safety during construction.

[0009]

In order to achieve the above-mentioned object, the present invention provides a U-shaped precast concrete beam form member in which a lower end main bar and a stirrup are embedded to form an upper opening at the upper end. The gist of the present invention is that an outward horizontal flange is formed and the longitudinal horizontal direction is arranged inside the outward horizontal flange.

[0010]

According to the present invention, by providing an outward horizontal flange internally laid in the longitudinal direction at the upper end forming the upper surface opening, the rigidity of the upper end of the left and right side plates 1a is improved by this horizontal flange. However, by doing so, the cross-sectional rigidity of the entire precast concrete beam form member can be increased so that buckling (buckling) is less likely to occur.

Further, since the floor formwork has its ends placed on the horizontal flange and is supported by the horizontal flange, a large joint area for the support can be secured.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of a precast concrete beam form member of the present invention, FIG. 2 is a vertical sectional side view of the same, and the same components as those of FIG. It was done.

In the figure, reference numeral 1 denotes a U-shaped precast concrete beam form member in which a lower end main reinforcement 3 and a stirrup 2 are embedded in the interior as in the conventional case. Further, the upper end portion of the stirrup 2 is exposed so as to straddle the upper surface opening portion 5, which is also the same as the conventional example.

According to the present invention, horizontal flanges 6 are provided outward at the upper ends of the left and right side plates 1a of the precast concrete beam form member 1 along the length direction.

Further, reinforcing reinforcing bars 7 are arranged in the outward horizontal flange 6 in the longitudinal direction of the horizontal flange 6. The thickness and width of the horizontal flange 6 and the number of reinforcing bars 7 are appropriately selected as needed.

The method of use is almost the same as the above-mentioned conventional example, and the precast concrete beam form member 1 is placed on the upper end of a column made on site or made of precast concrete with their ends facing each other. , Appropriate joint reinforcement is applied to the column / beam joints.

Although not shown in the drawing, an upper end main bar serving as a beam main bar is inserted into an upper end part of the stirrup 2 which is an exposed part, and a floor form 8 is attached to the end part of the precast concrete beam form member 1. It is set so as to be placed on the horizontal flange 6. The illustrated example is a case where a floor plate made of semi-precast concrete is used for the floor form 8, but a normal deck plate or plywood form may be used.

Floor reinforcement is carried out on the floor form 8, and the inside of the precast concrete beam form member 1 and the floor form 8
Concrete is cast on the top to integrate the concrete floor and the precast concrete beam form member 1.

[0019]

As described above, the precast concrete beam form member according to the present invention is provided with the outward horizontal flange arranged in the longitudinal direction at the upper end forming the upper surface opening, so that the horizontal horizontal flange is provided. The flange improves the rigidity of the upper ends of the left and right side plates, which increases the sectional rigidity of the entire precast concrete beam form member, making it possible to prevent buckling (buckling). . Further, by improving the rigidity in this way, it is possible to increase the pitch of the support work, which also contributes to the reduction of temporary materials.

Further, since the floor formwork has its end placed on the horizontal flange and is supported by the horizontal flange, a large joint area for the support can be secured and safety is improved during construction. It can also be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a precast concrete beam form member of the present invention.

FIG. 2 is a vertical sectional side view showing one embodiment of the precast concrete beam form member of the present invention.

FIG. 3 is a perspective view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Beam form member 1a ... Side plate 2 ... Star wrap 3 ... Bottom main bar 4 ... Column 5 ... Top opening 6 ... Horizontal flange 7 ... Reinforcing bar 8 ... Floor form

Claims (1)

[Claims] 1. In a U-shaped precast concrete beam form member in which a lower end main bar and a stirrup are embedded, an outward horizontal flange is formed at an upper end forming an upper surface opening, and the inside of the outward horizontal flange is formed. A precast concrete beam form member characterized in that it is reinforced in the longitudinal direction.