JPH028095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hollow slab and wall construction method that improves the integrity of the PC board and cast-in-place concrete, and a PC board used therein.

(Prior Art) For example, a hollow slab has a hollow portion (void) formed therein through which wiring and piping are passed. Construction methods for this hollow slab include a construction method using cast-in-place concrete and a composite construction method that combines cast-in-place concrete and PC boards. A conventional PC board used in this composite construction method is the one shown in Figure 6. The PC floorboard 13 in this example has ribs 13a for forming voids projecting from the top surface at equal intervals in the longitudinal direction, and the formwork 7 is supported between each rib. The construction method for the hollow slab is to lay the PC floorboard 13, support the formwork 7 between each rib 13a, then pour cast-in-place concrete to form the floor surface on this formwork, and then build the slab 8. And voids 9 are formed between the ribs.

(Problem to be solved by the invention) However, since the conventional PC floorboard is only connected to the cast-in-place concrete forming the floor surface at the joint at the upper end of the rib, the PC floorboard and concrete are not integrated. There are things that need to be improved in terms of gender.

The purpose of the present invention is to improve the integrity of the PC board and cast-in-place concrete that forms floors, walls, etc., and to ensure sufficient horizontal rigidity of the floor surface in the case of hollow slabs, for example, in the construction of hollow slabs and walls. The purpose of this company is to provide PC boards used in the same process.

(Means for Solving the Problems) A feature of the hollow slab and wall construction method of the present invention is that void-forming ribs of a predetermined height are formed integrally with the plate from the upper surface of the plate at a plurality of intervals. After arranging a plurality of PC boards in parallel, each of which is characterized in that the reinforcing bars are set up on the sides of the ribs and on at least one end of the board, and then the above-mentioned Arranging formwork facing the plate between the ribs and between the ends of the assembled reinforcing bars and the ribs, and installing the formwork on the rib-side side of the assembled reinforcing bars during construction of the formwork or in advance, Cast-in-place concrete is poured into this side formwork and into the formwork facing the plate. The formwork installed on the rib-side side of the assembled reinforcing bars is a plate-like or mesh formwork.

A feature of the PC board of the present invention is that it is a PC board used for implementing the above-mentioned construction method, and has a plurality of void-forming ribs of a predetermined height that are integrally formed with the board from the top surface of the board. The assembly reinforcing bars are protruded at intervals, and are erected on the sides of the ribs and on at least one end of the plate.

(Function) The plate 1 is connected to the cast-in-place concrete at the end of each rib 2, and integrated with the concrete at the 4 parts of the assembled reinforcing bars.

(Example) First, as an example of the present invention, a PC floorboard used for constructing a hollow slab will be described with reference to FIGS. 1 to 3.

In Figures 1 and 2, void-forming ribs 2, 2 are protruded at a predetermined interval from the center of the upper surface of the board 1 of the PC floorboard, and each rib forms a void on the board. It has a sufficient height to extend from the front end side to the rear end side in the longitudinal direction of the plate (vertical direction in FIG. 2). Reinforcing ribs 2a, 2a, 2a are provided at the front end, middle part, and rear end of the plate 1 to intersect with the respective ribs 2, 2. Shear connectors 3, . . . are provided protruding from the upper end surface of the rib. Cage-shaped assembly reinforcing bars 4, 4 are erected from the upper surface at both left and right ends of the plate 1, and the height of these assembly reinforcing bars is equal to that of the rib 2, and is arranged along the rib. . The assembled reinforcing bars 4 are as shown in Figures 2 and 3A.
As shown in the figure, the lower end reinforcing bars 4a, 4a are buried in the plate 1, the upper end reinforcing bars 4b, 4b are arranged above the plate parallel to the lower end reinforcing bars, and the tie bars 4c are wound around both the upper and lower end reinforcing bars. It has a rectangular cross section. A mesh formwork 5 is attached to the rib 2 side of the assembly reinforcing bar 4 as a side formwork, and the formwork can be received at the upper part of one side of the assembly reinforcing bar.

Next, the method of constructing a hollow slab using PC floorboards will be explained with reference to Fig. 4.

First, a plurality of plates 1 are arranged in sequence, and then U-shaped reinforcing bars 6 are placed between the adjacent assembly reinforcing bars 4, 4 of adjacent plates so as to face downward and straddle both sides, and then the ribs 2, Between 2 and assembled reinforcing bars 4 and ribs 2
A formwork 7 is arranged facing the top surface of the plate 1 between the
This formwork is supported on ribs and assembly reinforcing bars, and cast-in-place concrete is placed on the formwork and inside the mesh formworks 5, 5. A slab 8 is formed on the formwork 7, and a slab 8 is formed inside the mesh formwork. A joint 10 is formed,
Voids 9 are formed between the ribs and between the ribs and the joints.

The joint portion 10 ensures the integrity of the slab 8 and the plate 1, and at the same time allows the joints of adjacent plates to be connected.

As another example of assembled reinforcing bars, as shown in FIG. 3B, two lower end reinforcing bars 14a, 14a are embedded in the plate 1, one upper end reinforcing bar 14b is arranged above the plate, and three reinforcing bars are embedded in the plate 1. It may be an assembly reinforcing bar 14 having a triangular cross section, in which a tie bar 14c is wound around the reinforcing bar 14c. In the example of Figures 3A and 3B, reinforcing bars 4d and 14d (dashed lines in Figures 3A and 3B) are arranged between the upper reinforcing bars 4b and 14b and the lower reinforcing bars 4a and 14a along these reinforcing bars. Good too.

Examples of how to support the formwork 7 facing the plate 1 are shown in the fifth example.
This is shown in Figures A to 5B. In the example shown in Figure 5A,
The formwork 7 is supported by the upper end surfaces of the ribs 2 and the upper end corners of the assembled reinforcing bars 4. In the example shown in Figure 5B, one end of the formwork 7 is supported by a step 21 provided on the upper end side of the rib 2, and the other end is supported on the mesh formwork 5.

Furthermore, in FIG. 5C, both ends of the formwork 7 are supported by the upper ends of support plates 11 and 12 along the inner surfaces of the ribs 2 and assembly reinforcing bars 4. In this example, one of the support plates 12 also serves as the formwork for the joint, so
The mesh formwork 5 described above is not used.

The PC board is not necessarily limited to PC floorboards, but can also be applied to, for example, double walls in rooms that require sound insulation, such as TV studios, and PC wallboards used on the exterior walls of buildings.

(Effects of the Invention) In the present invention, since assembly reinforcing bars are protruded from the ends of the plates to connect with the cast-in-place concrete, integration with the cast-in-place concrete is improved, and for example, in the case of a hollow slab, it is possible to Sufficient horizontal rigidity of the surface can be ensured.
Compared to conventional PC boards used in composite construction methods, the PC board can be made lighter because assembly reinforcing bars are placed in place of ribs in some parts.

[Brief explanation of drawings]

Fig. 1 is a sectional view, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3A is an enlarged sectional view showing how assembled reinforcing bars are attached, and Fig. 3B is an enlarged view showing how other examples of assembled reinforcing bars are attached. 4 is a sectional view showing the state of use, FIGS. 5A to 5C are explanatory views showing each example of the method of supporting the slab formwork, and FIG. 6 is a sectional view showing the state of use of the conventional example. It is. DESCRIPTION OF SYMBOLS 1... Plate body, 2... Rib for void formation, 4, 14...
Assembly reinforcing bars, 7...formwork.

Claims (1)

[Scope of Claims] 1. A plurality of void-forming ribs of a predetermined height integrally formed with the plate are protruded from the upper surface of the plate at intervals, and on the sides of the ribs and at the side of the plate. After arranging a plurality of PC boards in parallel, each of which has assembly reinforcing bars erected on at least one end of the board,
Formwork is placed between the ribs and between the ends of the assembled reinforcing bars and the ribs, facing the plate, and the formwork is installed on the rib-side side of the assembled reinforcing bars during construction or in advance. , a construction method for hollow slabs and walls, characterized by pouring cast-in-place concrete into the side formwork and the formwork facing the plate body. 2. A PC board used for carrying out the construction method for hollow slabs and walls, in which a plurality of void-forming ribs of a predetermined height integrally formed with the board protrude from the top surface at intervals. 1. A PC board, characterized in that assembly reinforcing bars are erected on the sides of the ribs and on at least one end of the board.