JPH0325576B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a method of casting on-site using welded wire mesh for slab reinforcements.
Concerning the construction method of RC flooring. A method for constructing RC floors that simplifies reinforcement work by using welded wire mesh as slab reinforcement is already known. This involves splitting the upper and lower slab reinforcements based on structural calculations, and delivering the welded wire mesh divided into several parts to the site.After the slab formwork is set, the formwork is assembled. Place a spacer at the specified position above to ensure the thickness of concrete covering the bottom slab reinforcement, and install the wire mesh for the bottom slab reinforcement.
After joining these wire meshes together using lap joints,
This is done by placing a wire mesh for the upper slab reinforcement at a predetermined position on the formwork with another spacer, then joining the wire mesh together in the same way and pouring concrete.

However, in the above conventional method, on the formwork,
Work such as installing two types of spacers and joining the welded wire mesh to each other is required.In particular, after the wire mesh for the lower end slab reinforcement is installed, the wire mesh for the upper end slab reinforcement must be installed and joined above it. Therefore, the work was quite troublesome, the work efficiency was low, and the advantages of using the welded wire mesh were not fully utilized.

In addition, a pre-assembled unit body in which the upper end slab reinforcement and the lower end slab reinforcement are assembled in a box shape with a constant spacing is manufactured in advance in the factory, and then transported to the site and spacers are fitted onto the formwork. Although it has been considered that the pre-assembled unit is bulky, it is very inconvenient to transport it to the site.

The present invention provides a method for constructing a cast-in-place RC floor that can eliminate all of these conventional drawbacks.

Next, the method of the present invention will be explained based on embodiments shown in the drawings. First, the method of the present invention uses a hardware 1 shown in FIG. This hardware 1 includes parts 2 and 3 that support the lower end slab reinforcement and the upper end slab reinforcement, and a hook-shaped hanging part 4, and a part 2 that supports the lower end slab reinforcement and a part that supports the upper end slab reinforcement. 3 is hardware 1 to ensure concrete cover thickness
They are each provided a certain distance above the lower end of the .
In the illustrated example, the portions 2 and 3 that support the lower end slab reinforcement and the upper end slab reinforcement are hook-shaped, and are supported by hooking the lower end slab reinforcement and the upper end slab reinforcement. However, it may be supported in other ways. Further, the illustrated hardware 1 has its lower end removably inserted into the cylindrical portion of a resin cap a consisting of a cylindrical portion and a disc-shaped portion, and the cap a is mounted on a mount A to be described later. After fixing the caps in place, insert the hardware 1 into each cap a and hold the caps in an upright position.
However, a collar part for making the hardware 1 self-supporting may be integrally fixed to the lower end of the hardware 1.

A plurality of these metal fittings are erected at predetermined intervals on a flat pre-assembly stand A that has been set in advance near the site, for example, as shown in Figures 2 and 3, and the lower end slab of each metal fitting 1... The pre-assembled unit body 7 is assembled by supporting the welded wire mesh 5 for the lower end slab reinforcement on the portion 2 that supports the reinforcement, and the welded wire mesh 6 for the upper end slab reinforcement on the portion 3 that supports the upper end slab reinforcement. Note that the wire meshes 5 and 6 are divided into several pieces in advance, and are joined together on a pedestal using a lap joint or the like. Further, the wire mesh 6 for the upper end slab reinforcement is generally arranged with a notch in the center, as shown in FIG.

The pre-assembled unit body 7 thus assembled is suspended from the hanging parts 4 of each hardware, placed on the slab formwork 8 on site as shown in Fig. 5, and concrete is poured to construct an RC floor. . In this case, the supporting parts 2 and 3 of the hardware 1 for the lower end slab reinforcement wire mesh 5 and the upper end slab reinforcement wire mesh 6 are formed in the positions described above, so all you have to do is place the pre-assembled unit body 7 on the formwork. This will automatically ensure the covering thickness. In addition, for hanging the pre-assembled unit body 7, a third
What is necessary is to hook the hanging tool 9 as shown in the figure and hang the hanging tool 9 using a crane or the like. Also,
Although the cap a is left on the pedestal A and used repeatedly, it is also possible to embed it in the floor concrete together with the hardware 1.

Next, FIGS. 6 and 7 show the previously assembled unit body 7.
Fig. 6 shows how the wire mesh 5 for the lower end slab reinforcement is installed when the pre-assembled unit body 7 is installed on the formwork. The end of the lower end slab reinforcement wire mesh 5 is connected to the upper end slab reinforcement wire mesh 6 so as not to hit the upper end main reinforcement 11 of the precast concrete member 10 for small beams.
While the stirrup 1 of the precast concrete member 10 for small beam is located inside the end of the
2, a required number of fixing bars 13 having a length necessary for lap joints etc. are fixed in advance by welding or the like at positions corresponding to the bottom slab creases, and these fixing bars 13 are fixed in advance by welding or the like.
It is characterized in that both ends of the lower end slab reinforcement wire mesh 5 are joined.

FIG. 7 shows that by providing the upper end main reinforcement 11 of the precast concrete member 10 for small beams in a state embedded in the precast concrete, when the pre-assembled unit body 7 is placed on the formwork, the upper end main reinforcement 11 is embedded in the precast concrete. 1
1 does not get in the way of the wire mesh 5 for the lower end slab reinforcement. Note that 14 in FIG. 7 is a reinforcing bar, which is inserted into the stirrup 12 after the upper and lower end slab bars are arranged.

The method for constructing a cast-in-place RC floor according to the present invention is as follows:
As explained above, while ensuring the concrete cover thickness, multiple pieces of hardware with parts that support the lower and upper slab reinforcements and hanging parts were erected on a flat pedestal for pre-assembly. In this state, assemble the pre-assembled unit body by supporting the welded wire mesh for the lower end slab reinforcement in the part that supports the lower end slab reinforcement of this hardware, and the welded wire mesh for the upper end slab reinforcement in the part that supports the upper end slab reinforcement, respectively. Afterwards, this pre-assembled unit body is suspended from the hanging part of the hardware, placed on the formwork of the slab, and concrete is poured, resulting in the following effects.

Improves workability. This is because the pre-assembled unit body is assembled near the site and transported to the top of the slab formwork using a crane, etc., so it is necessary to install spacers on the formwork, join the wire mesh to each other, and assemble the wire mesh for the top and bottom slab reinforcements. Moreover, the hardware used for assembling the pre-assembled unit body serves as a hanging jig for the pre-assembled unit body and as a spacer to ensure the concrete cover thickness of the upper and lower end slab reinforcements. After installation on the formwork, it is not necessary to remove metal fittings, and even without using a spacer, just by placing the pre-assembled unit body on the formwork, the covering thickness can be ensured automatically.

It is also very convenient when transporting from the factory. This is because the pre-assembled unit body can be assembled using hardware near the site, rather than being produced in advance in the factory, so the factory can produce low-volume metal parts for the upper and lower slab reinforcements. This is because it is only necessary to transport the net-like surface material, and therefore a large amount of material can be transported at once.

[Brief explanation of the drawing]

The drawings show one embodiment of the method of the present invention, FIG. 1 is a diagram showing hardware used in the method of the present invention, and FIGS. 2 and 3 are a plan view and a front view, respectively, showing the procedure for assembling the pre-assembled unit. . Figure 4 is a plan view of the upper end slab reinforcement, Figure 5 is a cross-sectional view showing the state after concrete pouring, Figure 6 is a diagram showing the state in which composite beams are assembled, and Figure 7 is a diagram showing the main reinforcement in precast concrete. It is a diagram showing a state in which buried small beams are assembled. 1... Hardware, 2... Part that supports the lower end slab reinforcement, 3... Part that supports the upper end slab reinforcement, 4...
Hanging part, 5... Welded wire mesh for lower end slab reinforcement, 6
...Welded wire mesh for upper end slab reinforcement, 7... Pre-assembled unit body, 8... Slab formwork.

Claims (1)

[Claims] 1. While ensuring the concrete cover thickness, multiple pieces of hardware with parts that support the lower end slab reinforcement and upper end slab reinforcement, and a hanging part are erected on a flat pre-assembly pedestal, and this hardware is installed. Welded wire mesh for the lower end slab reinforcement is installed in the part that supports the lower end slab reinforcement.
The pre-assembled unit body is assembled by supporting the welded wire meshes for the upper-end slab reinforcements on the parts that support the upper-end slab reinforcements, and then the pre-assembled unit body is suspended from the hanging part of the metal fittings and placed on the slab formwork. Cast-in-place, which is characterized by placing concrete and pouring concrete.
How to construct an RC floor.