JPH0356568Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is a PC used for hollow slabs, hollow walls, etc.
Regarding the board.

(Prior art) For example, a PC board used for hollow slabs has a plurality of ribs protruding from the top surface of the PC board for forming hollow parts (voids) at equal intervals, and each rib extends in the longitudinal direction of the PC board. ing. As shown in Fig. 5, a formwork K is set horizontally between the ribs 11a of the PC board 11, and post-cast concrete C, which forms the floor surface, is poured from above the formwork to form ribs within the slab. A hollow space partitioned with post-cast concrete is formed, and equipment piping and wiring can be installed inside this hollow space, and this can be used as a duct space. Conventionally, post-cast concrete C and rib 11a
The upper end of an L-shaped stirrup 12 reinforced within the PC board and rib was made to protrude above the rib, and its protruding end 12a was intended to be anchored to the post-cast concrete. The slab reinforcement 14 is held by the protruding end 12a of the stirrup to maintain the level. 13 is a reinforcing bar.

(Problem to be solved by the invention) However, according to the conventional PC board, since the stirrup protrudes above the upper end of the rib,
When making a PC board, when leveling the top end of the rib with a trowel,
The protruding end of the stirrup gets in the way, takes time to finish, and requires the use of a floating formwork, which takes time and effort to manufacture, making it impossible to improve the productivity of PC boards. It is not easy to hold the slab strips at the protruding end of the stirrup and ensure the level of the slab strips.

The purpose of this invention is to improve the productivity of PC boards,
The objective is to facilitate the retention and leveling of slab muscles.

(Means for Solving the Problems) The PC board of the present invention is equipped with assembled joint reinforcing bars, ribs for forming hollow parts, reinforcing ribs, end ribs, and cotters. The assembly joint reinforcing bars are erected at both ends of one surface of the PC board body in the width direction of the body and over the entire length in the length direction of the body. The above-mentioned ribs for forming hollow portions protrude from one side of the PC board body and extend in the length direction of the main body, and a plurality of ribs for forming hollow portions are arranged at intervals in the width direction of the main body. It is something. The reinforcing ribs protrude from one surface of the PC board body and intersect with the ribs for forming the hollow portion. The end ribs are provided at both ends of the PC board body in the length direction, respectively, so as to protrude from one surface of the body. The cotters are arranged in parallel at predetermined intervals in the direction in which the ribs extend, on the end faces of the hollow part forming ribs and the reinforcing ribs that are to be joined to the post-cast concrete.

(Function) At the joint between the main body of the PC board and the post-cast concrete, the ribs for forming the hollow part and the reinforcing ribs are joined to the post-cast concrete. PC boards can be connected to adjacent PC boards using assembled joint reinforcing bars.

(Embodiment) An example in which an embodiment of the present invention is applied to a floorboard will be described below with reference to FIGS. 1 to 3.

The main body 1 of the PC board has a planar rectangular shape, and concrete ribs 1a for forming hollow parts are protruded from the top surface of the main body at intervals, and each rib 1a extends in the length direction of the main body (vertical direction in Fig. 3). Extends almost the entire length, PC
It is formed integrally with the main body 1 of the plate. A C-shaped stirrup 2 is arranged within each rib 1a, the lower end of which extends into the main body 1, and both upper and lower ends of the stirrup are wrapped around reinforcing bars 3, 3.
The upper end surface of the rib 1a has a concrete cotter 1b.
are provided continuously in the length direction at equal intervals, and these cotters connect with post-cast concrete C. In FIG. 3, a reinforcing rib 1c is provided on the main body 1 and intersects with the rib 1a, and this reinforcing rib 1c has the same structure as the rib 1a. Assembly joint reinforcing bars 1d are erected over the entire length of the upper surface of the main body 1 on both left and right sides to connect it to adjacent PC boards. Reference numeral 1e denotes end ribs formed at both front and rear ends of the upper surface of the main body 1.

To explain the method of manufacturing a PC board, first, a formwork for ribs is erected on the ground, a formwork for the PC board body 1 is set on top of this formwork, and then concrete is poured. Another manufacturing method is to use floating formwork for the rib formwork. In this case, the formwork for the main body 1 is set on the ground, the formwork for the ribs is floated above the formwork for the main body 1, and then concrete is poured.

Explain how to use the PC board.

First, each PC board is laid one after another with the rib 1a facing upward, then the formwork K is set between the adjacent ribs on each PC board, and then the slab strips 4,
Reinforce 4a. At the time of reinforcing, the slab reinforcements 4 are placed on the cotters 1b, and the cotters are used as spacers. Thereafter, post-cast concrete C is poured onto the formwork K and the ribs 1a. The post-cast concrete C is integrally connected to the ribs 1b and 1c by the ribs 1b and 1c. As a result, a hollow portion surrounded by the ribs 1a and the post-cast concrete C is formed in the slab.

As shown in Figure 3, ribs 1c are attached to the main body 1 of the PC board.
By providing this, rigidity can be ensured during demolding and transportation of the PC board.

Further, as shown in FIG. 4, the width of the turret 1b1 may be made narrower than that of the upper end surface of the rib 1a1 to increase the joint area between the turret and the post-cast concrete C.

Of course, the PC board may be used for walls, for example, and in this case, it is suitable for areas that have a high floor height and require sound insulation performance, such as studios of broadcasting stations.

(Effects of the invention) According to the PC board of the invention, a trowel is provided on the end face of the rib for forming the hollow part, and unlike in the past, the reinforcing bars do not protrude, making it easy to trowel. Since reverse punching is also possible without the use of a screw, manufacturing is facilitated, and productivity can therefore be improved. The ribs for forming the hollow portion and the reinforcing ribs can be used as means for supporting the reinforcement of the post-cast slab, making it easier to hold the slab reinforcement, ensure the level, and perform the reinforcement work. In addition, the PC board has ribs for forming hollow parts, reinforcing ribs, and end ribs on one side, so it can provide a strong PC board.In addition, the ribs for forming hollow parts and reinforcing ribs are provided with cotters, and reinforcing bars for assembly and connection. Since it is installed vertically, it is possible to ensure integration with the post-cast concrete and connection with the adjacent PC board.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts of the PC board showing the state of use.
Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a PC
A sectional view of the plate, FIG. 4 is a partially cutaway perspective view showing another embodiment in use, and FIG. 5 is a sectional view of a conventional example. 1...Main body of PC board, 1a, 1a1...Rib for forming hollow part, 1b, 1b1...Cotter, 1c
...Reinforcement rib, 1d... Assembly joint reinforcing bar, 1e...
End rib, C... Post-cast concrete.

Claims (1)

[Claim for Utility Model Registration] At both ends of one side of the PC board body in the width direction of the body, assembly joint reinforcing bars are erected over the entire length in the length direction of the body, and protrude from one side of the PC board body. In addition, a plurality of ribs for forming a hollow part extending in the length direction of the main body are arranged at intervals in the width direction of the main body, and the ribs for forming a hollow part are arranged so as to intersect with each other.
A reinforcing rib is provided protruding from one side of the PC board body, and end ribs are provided at both longitudinal ends of the PC board body, respectively, to form a hollow part that will be joined to post-cast concrete. A PC board characterized in that on the end faces of the ribs and reinforcing ribs, cotters are arranged in parallel at intervals in the direction in which the ribs extend.