JPS6235764Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used when constructing composite floor slabs and composite exterior walls by integrating with cast-in-place concrete.
Regarding the PC version, for details, see
Regarding the PC version.

Generally, when constructing a composite floor slab or synthetic exterior wall that has the required strength as a structure using PC slabs and cast-in-place concrete, it is necessary not only to ensure the cross-sectional performance of the PC slab itself, but also to ensure that the cast-in-place concrete It is necessary to ensure the bonding strength of the joints.

Conventionally, as a PC plate that satisfies these conditions, a so-called omnia plate has been used, in which omnia strips are exclusively protruded from one side of a precast concrete plate, and are used as a joining member for cast-in-place concrete.

However, in this case, the Omnia bar itself is made of a special steel material and has a shape that is difficult to manufacture, requiring a large number of welding points, making it very expensive. Disadvantages include the need for complicated reinforcement work, such as arranging the required number of Omnia reinforcements in multiple parallel rows within the formwork and positioning them so that the rows of Omnia reinforcements do not shift during concrete pouring. It was hot.

In view of this current situation, the present invention uses expanded metal with a zigzag folded structure through simple processing in place of the omniar reinforcement, thereby increasing the bonding force of the joint to cast-in-place concrete. The purpose is to provide a PC version that can eliminate the above-mentioned conventional drawbacks without any damage.

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

Figures 1 and 2 show PC plates for producing synthetic floor slabs, etc. according to the present invention, where A is expanded metal;
B is a precast concrete version.

The expanded metal A exhibits a zigzag-like folded plate structure having multiple rows of mutually parallel concavo-convex strips with slope portions 1 connected by bending, and a formwork for forming a precast concrete plate (not shown). ) is set with its bending ridge line a facing the long side direction, and concrete is poured into the formwork with the lower half buried to make a PC plate. The upper half of the expanded metal A protruding from one side of B constitutes a pour joint member 2 for cast-in-place concrete C.

3..., 3'... are through lines provided across adjacent bending ridge lines of the expanded metal A,
They are arranged in parallel at intervals in the longitudinal direction of the bent ridgeline. 4..., 4'... are adjacent through bars 3..., 3'...
It is a reinforcing bar that spans the area and is placed between adjacent ridge lines.

5... are spiral reinforcements (meaning helical reinforcing bars), which are provided near the bending ridge line and inscribed in the adjacent slope portions 1, 1.

These spiral reinforcements 5... are created by assuming that stress acts in a distributed manner on the side surfaces of a composite slab etc. constructed using PC slabs and cast-in-place concrete C, as shown in Figures 4A and 4B. Based on the load distribution diagram and the bending moment diagram of the distributed load shown in Figure C, it is found that the composite structure is provided at least in the range where compressive stress acts on the composite structure, and that the spiral reinforcement is applied to the inner side of the spiral. By restraining the concrete in place, the compressive strength is increased and the bending strength of the PC board as well as the composite structure itself is increased.

In addition, the above-mentioned through bars 3..., 3'..., reinforcing bars 4...,
4'... and the spiral strips 5... are integrated into the expanded metal A through a binding process, but they can be changed to other means such as crimp-bonding or welding, and they are not included in the PC version. The through bars 3', reinforcing bars 4', and spiral bars 5 placed on the sides are made of expanded metal A.
In addition to integrating it into the site, it is also good to integrate it at the site.

Next, 6... is a PC steel material placed along the bending ridgeline of the lower half of expanded metal A.
By applying a required tensile force to the PC steel material 6 and forming the precast concrete plate B, and by releasing the tensile force after forming the concrete plate B, prestress is introduced into the concrete plate B. It is set as.

According to the above configuration, by using the expanded metal A instead of the omni strip, it is possible not only to manufacture a PC plate for making a synthetic floor slab at a low cost, but also to make the expanded metal A long in the long side direction. Since it has a zigzag-like folded plate structure with multiple rows of uneven stripes, the mutual positional relationship of the folding ridge lines in each row is constant, so there is no need to worry about misalignment of the folding ridge lines during concrete pouring. This eliminates the need for reinforcing bars, making it possible to save labor in reinforcing work.

Also, in the concrete of the PC version, prestress is introduced by embedding prestressing steel along the bending ridgeline of the lower half of the expanded metal.
A highly rigid PC version can be obtained.

In particular, in the case of the above-mentioned embodiment, the following advantages can be expected in addition to the above-mentioned effects due to the presence of the spiral muscles 5. In other words, the compressive strength in the longitudinal direction of the PC plate can be improved by orienting the bending ridge line of the expanded metal A in the long side direction of the PC plate and arranging spiral reinforcements 5 near the bending ridge line. can be strengthened, and the cross-sectional performance of the PC version itself can be sufficiently ensured.
It is possible to increase the bending strength of not only the PC version but also the composite construction itself using it.

As described above, the present invention involves arranging expanded metal that is bent in a zigzag shape and having multiple rows of concave and convex lines that are parallel to each other, with the bending ridge line facing the long side direction of the PC plate. , the lower half of the expanded metal was buried in concrete, and was buried along the bending ridge line of the lower half.
In addition to introducing prestress using prestressed steel,
The feature is that the upper half of the expanded metal is made to protrude from one side of the PC board and is configured as a joining member for cast-in-place concrete.

The effects of the present invention with the above characteristic configuration are as follows.

On one side of the PC board, we used expanded metal bent in a zigzag pattern instead of the conventional omni-stripe to form a joint member for the cast-in-place concrete, resulting in lower material costs and synthetic floor slabs. PC plates for production can be manufactured at low cost.

Since we use expanded metal that is bent in a zigzag pattern with multiple rows of parallel uneven lines, the positional relationship between the bent edges of each row of uneven lines is always constant, making the expanded metal When placing concrete in the formwork for PC plate production or pouring concrete into the formwork,
There is no need to consider misalignment between adjacent bent ridge lines, labor-saving reinforcement work and easy manufacture of PC plates.

In the concrete of the PC plate, prestressing steel is buried along the bending ridgeline of the lower half of the expanded metal to introduce prestress, resulting in a highly rigid PC plate.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Figure 1 is a partial side view of a PC plate for producing synthetic floor slabs, etc., and Figure 2 is the same as above.
A partial cross-sectional view of the PC version in the short side direction, Figure 3 is a partial perspective view of the expanded metal, Figure 4 A is a uniform load distribution diagram, Figure B is a bending moment diagram, and Figure C is the arrangement of spiral reinforcements. The illustration, FIG. 5, is a partial cross-sectional view of the synthetic construct. A... Expanded metal, C... Cast-in-place concrete, 2... Pour joint member, 5... Spiral reinforcement, 6... PC steel material.

Claims (1)

[Scope of utility model registration request] It is a rectangular PC plate with a pouring member for cast-in-place concrete protruding from one side, and is made of expanded metal bent in a zigzag shape with multiple rows of parallel uneven stripes. The lower half of the expanded metal is placed in a state facing the long side direction of the PC plate, and is buried in concrete, and prestress is introduced by the PC steel material buried along the bending ridge line of the lower half. Further, the PC board is characterized in that the upper half of the expanded metal is configured to protrude from one side of the PC board to form the joining member.