JPH1150584A - Half pc board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of cracks by forming a thick board section thick at the center section, forming a thin board section thin on the periphery, providing joint sections of reinforcing bars on the side faces of the thick board section at the center section, and protruding the reinforcing bars on the side faces of the thin board section. SOLUTION: A thick board section 1 thick in thickness is formed at the center section, joint sections 11 of reinforcing bars are provided on the side faces of the thick board section 1 at the center section, and connecting reinforcing bars 12 are removably fitted. A thin board section 2 thinner than the thick board section 1 is formed on the periphery of the thick board section 1 at the center section, reinforcing bars 21 are protruded outward on the side faces of the thin board section 2, and resistance members 22 such as stud bolts are protruded on the upper face. Cast-in-place concrete is placed at the position of the adjacent PC floor board, short reinforcing bars 21 from the end faces of the thin board section 2 and long connecting reinforcing bars 12 from the end faces of the thick board section 1 are protruded, and the reinforcing bars 21, 12 are bound to the reinforcing bars on the cast-in-site concrete side. The PC board and the cast-in-site concrete can be surely integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half PC version.

[0002]

2. Description of the Related Art In order to solve the problem of a structure in which only PC plates are sequentially arranged, a structure in which a cast-in-place concrete floor slab is interposed between PC plates has been adopted. FIG. 4 shows an example of such a structure in which one end of a PC plate b is installed on a spar a, and concrete is cast adjacently c.

[0003]

However, even with this structure, there is a high possibility that cracks d will occur in the concrete at the joint surface between the end of the PC plate b and the cast-in-place concrete c. In particular, in the case of a continuous beam structure, a crack d is generated in the most bent portion, which is inconvenient. Another problem was that the reinforcing bars were not continuous between the PC plate b and the cast-in-place concrete floor slab c.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a half-PC plate in which a PC plate and cast-in-place concrete are well joined and cracks are less likely to occur.

[0005]

Means for Solving the Problems To achieve the above object, a half PC plate of the present invention is a precast concrete plate in which a central portion is formed as a thick plate portion and a peripheral portion is formed as a thick plate portion. Is formed as a thin slab, and a reinforcing bar joint is provided on the side of the thick slab in the center, and a reinforcing bar is projected outward on the side of the surrounding stencil. On the upper surface, a half PC plate is formed by projecting a resistance member.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<A> Thick Plate Section The precast concrete slab usually has a constant thickness, but in the present invention, a thick plate section 1 having a large thickness is formed particularly at the center thereof. Then, a joint portion 11 of a reinforcing bar is provided on a side surface of the thick plate portion 1 in the central portion. A long connecting reinforcing bar 12 is attached to the joint portion 11 so as to be detachable.
Therefore, if, for example, the connecting reinforcing bar 12 in the width direction is removed during transportation, the plate can be transported as a narrow width plate. For example, a nut-shaped joint hardware is embedded as the joint portion 11, and only the end face of the nut is exposed on the side surface of the thick plate portion 1. Alternatively, a commercially available resin joint can be provided.

<B> Thin plate portion A thin plate portion 2 having a thickness smaller than the thickness of the thick plate portion 1 is formed around the central thick plate portion 1. Reinforcing bars 21 protrude outward from the side surfaces of the thin plate portion 2. Further, on the upper surface of the thin plate portion 2, for example, a stud bolt is protruded as a resistance member 22.

<C> Construction method. When the slab is constructed, the thin plate portion 2 of the half PC plate of the present invention is used.
Over one end of digit 3 Therefore, P
The boundary between the thin plate portion 2 and the thick plate portion 1 is separated from the main girder, not the entire thickness of the C plate but the thin plate portion 2 only. A long connecting reinforcing bar 12 is attached to the joint portion 11 of the thick plate portion 1 of the PC plate. In this case, if the joint portion 11 is a nut, the joint portion 11 is screwed in using a connecting reinforcing bar 12 having a screw cut at an end. Concrete is cast in place at the position of the adjacent floor slab, but a short reinforcing bar 21 protrudes from the end surface of the thin plate portion 2 and a long connecting reinforcing bar 12 extends from the end surface of the thick plate portion 1.
Is protruding. Therefore, each rebar can be bound to each rebar on the cast-in-place concrete side. When the concrete is cast in this way, the precast plate and the cast-in-place concrete are surely integrated.

[0010]

As described above, the half PC plate according to the present invention has the following effects. <A> The central portion is formed as a thick plate portion 1 having a large thickness, and the periphery is formed as a thin plate portion 2 having a small thickness. Therefore, the thickness does not change suddenly at the boundary with the adjacent cast-in-place concrete. Therefore, the possibility of occurrence of cracks is greatly reduced, and a highly reliable slab can be constructed. <B> A structure in which a joint portion of a reinforcing bar is provided on the side surface of the thick plate portion 1 in the central portion, and a long connecting reinforcing bar is connected at the time of construction. Therefore, a narrow unit can be handled during transportation and handling, which is extremely economical. <C> Since it is possible to bind with the reinforcing steel on the side of the cast-in-place concrete, an integrated structure in which the reinforcing steel is overlapped can be obtained. <D> In the central part, there is no need to cast concrete on site, and the quality and strength of concrete are secured in advance. It can be widely used as a storage space. <E> Since it is lighter in weight than the case of using the full PC version, it is easy to handle and can be installed with a small lifting machine.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a half PC version of the present invention.

FIG. 2 is an explanatory diagram of a use state.

FIG. 3 is a side view in a use state.

FIG. 4 is an explanatory diagram of a conventional configuration.

Claims (2)

[Claims] In a precast concrete slab, a central portion is formed as a thick slab portion, a periphery is formed as a thin slab portion, and a side of the thick slab portion at the center portion is provided with a reinforcing bar joint. Half-PC plate, with a reinforcing bar protruding outward on the side of the surrounding thin plate portion and a resistance member protruding on the top surface of the thin plate portion. 2. The half-PC plate according to claim 1, wherein a nut-shaped fitting is provided on a side surface of the thick plate portion at the center.