JPS60181452A - How to build floorboards - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method of constructing a floorboard.

BACKGROUND ART Conventionally, there is a generally known floor board in which the lower part is made of a precast board (hereinafter abbreviated as PC&) and the upper part is made of concrete cast on site. Such floorboards are constructed by a method such as Sujoji. In other words, a PC board is manufactured at a factory or near the construction site, the manufactured PC board is set in the floorboard construction position, and then the set PC board is used as a pouring formwork, and concrete is poured on top of it. This is the way to do it.

By the way, the above-mentioned floor board construction method does not require the removal of the formwork and has the advantage of saving labor and shortening the construction period. The strength of the bond at the joint between the two parts was weak, and the method of making this part remained an unresolved problem.

By increasing the out-of-plane rigidity of the PC board in the above-mentioned floor slab construction method, it is possible to reduce the need for shoring to support the PC board, resulting in further labor savings and shorter construction times. The effects can be expected. For this reason, it has been desired to increase the out-of-plane rigidity of the %PC board in the method for constructing the floor board.

The present invention has been made in view of the above circumstances, and it is possible to increase the bonding strength between the PC board and the upper concrete to be cast later, and also to increase the out-of-plane rigidity of the PC board without increasing the weight of the PC board. It is an object of the present invention to provide a method for constructing floorboards that can reduce the number of supporting supports and further save labor and shorten the construction period.

An embodiment of the present invention is shown in FIGS. 1 to 6(a) below.

This will be explained with reference to (b). Figure 1 shows an example of a PC board used when carrying out the present invention.
10. It is composed of a flat portion 2 into which prestress is introduced, and a plurality of rib portions 3 provided on the upper surface of the flat portion 2 so as to protrude in parallel with each other.

As shown in FIG. 2, a sheath pipe 4 is buried inside the flat part 2 and inside the lower end of the rib part 3 along the length direction of the rib part 3, and anchors are installed at both ends of the sheath pipe 4. A plate 5 is attached.

Further, numeral 6 in the figure indicates a welded wire mesh buried within the flat portion l.

The PC board 1 is made in a factory or a vacant lot near the site, and when the poured concrete has a predetermined strength, the PC board 1 is installed in the sheath pipe 4.
A steel material is inserted and prestressed. and,
The PCC 10 thus prestressed is transported to the floor board construction site and set at the lower position of the floor board to be constructed, as shown in FIGS. 3 and 4. At this time, the rigidity of the PCC 10 is increased by providing the rib portion 3 and introducing prestress, and therefore the support 7 for supporting the PC board 1 is as shown in the figure. It is sufficient to place it only at the four corners of PCC10.

FIGS. 3 and 4 show an example in which the floorboards are disposed across the beams H1 of the Re structure. After the PCC 10 is set at a predetermined position as shown in FIG. 4, reinforcing bars 8 are placed on top of the PC board 1. At this time, if the rib configuration of the PCC 10 is set at a predetermined height in advance, the spacer for supporting the reinforcing bar 8 can be omitted. The above PC board 1
In parallel with the reinforcing work on the upper part of , reinforcing bars 9 are also placed in the part that becomes @HI. Next, PCC1 arranged as described above
Using the zero pour as a frame, concrete is integrally placed on the upper part of the frame and on the part that will become the beam H1.

Thus, the after-shot conch on the upper side of PCC10! J-1
This results in a synthetic floorboard that is integrated with no. In the floorboard constructed in this way, since the rib portion 3 provided in advance of the PCC 10 acts as a pouring key, the PCC
10 and the post-cast concrete IJ-te 10 above it are firmly connected, resulting in a floorboard with excellent strength.

In addition, during the construction process of the above-mentioned floorboard, when PCC10 prestress is introduced, as shown in Fig. 5(a), the upper side becomes convex and curved. As shown in Figure (b), compressive stress is generated that gradually increases downward. When concrete is poured on top of the PCC 10 in such a state, due to the load of the concrete 10 poured afterwards, the constructed floor plate is peeled off and has a flat shape as shown in Fig. 6(a). Then, as shown in FIG. 6(b), the compressive stress on the lower end side is relaxed, a uniform compressive pressure remains in the PCC plate portion, and a small compressive stress is generated in the post-cast concrete 10.

FIG. 7 shows another example of a PC board used in carrying out the present invention. The PC board 11 shown in this figure is suitable for constructing a relatively thick floorboard.

The rib portion 12 is reinforced by IWm 13 (embedded inside), and this H-shaped steel 13 is reinforced by reinforcing plates 14 arranged at predetermined intervals in the length direction of the I-shaped steel 13. In the figure, 15 is the anchor plate;
16 indicates a sheath tube. When prestress is introduced, the PC board 11 as shown above bends so that the upper side becomes convex, as shown in FIG. 8(a), and then bends as shown in FIG. 8(b). IJ Tensile stress is generated in the upper part of the X part 12, and the lower part of the X part 12 and the flat part 17
compressive stress occurs. When concrete is poured on top of the PC board 11 in such a state, the constructed floor board peels off due to the load of the concrete 18 that is poured afterwards, as shown in FIG. 9(a). It has a flat shape, and as shown in FIG. 9(b), a uniform compressive stress remains over the entire area of the floorboard.

FIG. 10 shows yet another example of the PC board.

The PC board 21 shown in this figure has a structure in which a rib portion 23 is provided on the upper side of a flat portion 22 and projects in the shape of a base hole, and a sheath tube 24 is buried in the flat portion 22 in a shape of a base hole. .

FIGS. 11 and 12 show an example in which the floorboard is placed between the beams H2 of the S structure. In this example, an H-shaped steel 31 is placed in advance at the portion that will become the beam H1, and a PC board 32 is placed above the H-shaped steel 31 so as to straddle them.
will be arranged. At this time, since the PC board 32 has high rigidity, there is no need to support the intermediate portion of the PC board 32 with a support or the like.

FIGS. 13 to 15 show an example in which the floorboard is disposed across the beams H8 of the S-C structure. In this example, an H-shaped steel 41 is placed in advance at the portion that will become the beam H1, and reinforcing plates 42 are placed at predetermined intervals in the length direction of the H-shaped steel 41. Reinforcement plate 42
The upper part of the reinforced area is said to be wider. On the other hand, a protrusion 44 that protrudes laterally is formed at a predetermined location on the peripheral edge of the PC board 43, and this protrusion 44 is connected to the H
The PC board 43 can be easily set in a predetermined position by overlapping it on top of the wide portion of the shaped steel. Then, concrete is poured over the PC board 43 set in this manner and around the H-shaped steel 41, thereby obtaining a floor plate that is integrated with the beam H8.

In the above embodiment, a post tension method is used as a method of applying prestress to the PC board, but the present invention is not limited to this, and a pretension method may be used.

As explained above, according to the present invention, a precast board having a flat part into which prestress is introduced and a rib part protruding from one surface of this flat part is placed in a floor plate such that the rib part is on the upper side. This is because the structure is such that the precast board is set at a construction site, the precast board is used as a pouring formwork, and concrete is poured on top of the precast board to construct the floorboard.

■ The ribs play the role of pouring joint keys, and the joint area between the precast board and post-cast concrete becomes large, which increases the bonding strength between the precast board and post-cast concrete, resulting in the improvement of the floor board. Increases rigidity.

■ The introduction of prestress and the action of the ribs increase the out-of-plane rigidity of the precast board itself, making it possible to reduce or eliminate the need for shoring to support the precast board, resulting in further labor savings and shorter construction times. can be realized.

■ Precast boards can be made outside the construction site, such as in a factory or in a vacant lot near the site, making it easier to manufacture and introduce prestressing.

■ When prestress is introduced, a part of the precast board is bent, but the bending is canceled by the load of the post-cast concrete placed on top of it, and it becomes flat.

■ By introducing prestress, the rigidity of the floorboard itself can be increased, and defects such as cracks can be prevented from occurring.

■ When installing floor plates across concrete beams, they can be integrated with the concrete beams.
A floorboard with excellent strength can be constructed.

(2) By setting the rib configuration of the precast plate to a predetermined 116, it is possible to omit the spacer for the upper end reinforcing bar buried in the post-cast concrete.

Effects such as this can be obtained.

[Brief explanation of drawings]

Figures 1 to 6 (a) and (b) show one embodiment of the present invention, where Figure 1 is a perspective view of a precast board, and Figure 2 is a perspective view of a precast board.
The figure is a partially enlarged perspective view, Figure 3 is a plan view shown to explain the method of constructing the floorboard where the frame is passed between the beams of the RC structure, and Figure 4 is a cross section taken along line iv-IV in Figure 3. Figure, 5th
Figure (a) is a side view of a part of the precast board into which prestress has been introduced, Figure 5 (b) is a stress distribution diagram of the same precast board, and Figure 6 (a) is the upper part of the precast board. 6(b) is a stress distribution diagram of the same floor board, FIG. 7 is a perspective view showing another example of precast board, and FIG. 8(a) is the same precast board. A partially cross-sectional side view showing a state where prestress has been introduced into the board, Figure 8 (b) is a stress distribution diagram of the same precast board, and Figure 9 (a) is a diagram showing concrete poured on the top of the precast board. A sectional view showing the installed state, FIG. 9(b)
) is a stress distribution diagram of the same floor board, Figure 10 is a perspective view showing another example of a precast board, and Figures 11 and 12 are for explaining the construction method of a floor board in which a frame is passed between the beams of an S structure. Figure 11 is a plan view and Figure 12 is a first view.
■ - Cross-sectional view along the cutting line in Figure 1, Figures 13 to 15 are S
The frames between the beams of the C structure are shown to explain the method of constructing the floorboards that are passed between them. Figure 13 is a plan view, Figure 14 is a sectional view taken along the line XIV-XIV in Figure 13, and Figure 15. is an enlarged view of the inside of W in FIG. 14. 1... PC board, 2... flat part, 3...
...Rib part, 4...Sheath pipe %H1...
... Beam, 10 ... Post-cast concrete, 11
...... PC board, 12... Rib part, 16.
... Sheath pipe, 17 ... Flat part, 21.
...PC board. 22... Flat part, 23... Rib part, 2
4... Sheath pipe, H3... Beam, 32.
...PC board, Hs...beam, 43...
...PC board. Fig. 1 7 Fig. 2 - Fig. 3 1 Fig. 4 Fig. 5 (a) Fig. 5 (bl Fig. 6 (al Fig. 6 3.. Fig. 8 (a) 11 Fig. 9 (a) Old Figure 8 (b) Figure 9 (b) Figure 11 Figure 12 Figure 13 Figure 15

Claims (1)

[Claims] A precast board having a flat part into which prestress is introduced and a rib part protruding from one side of this flat part is set at a floorboard construction site with the rib part facing upward, and the precast board is A method for constructing a floor board, which is characterized by using the cast formwork as a pouring formwork and pouring concrete on top of the formwork to construct the floor board.