JPS6127371Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a precast concrete slab (hereinafter referred to as PCa slab) that is used to create composite floor slabs and synthetic exterior walls by integrating with cast-in-place concrete.

In general, when constructing a composite floor slab or composite exterior wall that has the required strength as a structure using PCa slab and cast-in-place concrete, it is necessary to not only ensure the cross-sectional performance of the PCa slab itself, but also to connect the concrete by pouring in-situ. It is necessary to ensure the bonding strength of the parts.

For the production of synthetic floor slabs etc. that meet these conditions
Conventionally, the so-called omnia version, in which omnia reinforcement is embedded in one side of a precast concrete version, has been used as a PCa version.

However, in this case, the Omnia bar itself is made of a special steel material and has a shape that is difficult to manufacture due to the large number of parts and the need for many welding points. When forming the plate, the required number of Omnia strips are arranged in multiple rows parallel to each other in the formwork, and for each Omnia strip,
There were drawbacks such as the need for complicated reinforcing work such as positioning the Omni reinforcement so that the rows would not shift during concrete pouring.

The present invention provides a PCa slab for construction methods such as synthetic floor slabs that can overcome these conventional drawbacks. That is, in the PCa plate according to the present invention, a plurality of linear slits are inserted into the steel material at predetermined intervals, and the slits are parallel to each other and the positions of the slits match in the direction perpendicular to the longitudinal direction of the slits. A splicing plate is formed by alternately bulging and deforming the plate portions vertically to form a plurality of convex portions on both the upper and lower surfaces of the steel plate. It is characterized in that it is buried in such a way that the section protrudes from the top surface of the precast concrete slab.

Hereinafter, embodiments of the present invention will be described based on the drawings.

First, as shown in FIG. 1, a steel plate (blast furnace material may be used, but electric furnace material is used in this embodiment) 1 is provided with linear slits 2a, 2b, A plurality of slits 2c, 2d... are placed parallel to each other and the positions of the slits 2a, 2b, 2c, 2d... match in the direction perpendicular to the longitudinal direction of the slits, and these linear slits 2a, 2b, 2c, 2d... Insert a roughly V-shaped slit 3 between them.

Thereafter, as shown in FIG. 2, the steel plate 1 is stretched so that the substantially V-shaped slits 3 are expanded into a substantially rectangular shape.

Next, by pressing the expanded metal 1' obtained as described above, the broken lines a shown in FIG. 2 are folded, and the plate portions b... between the broken lines a...
While leaving the steel plate 1 flat, move the plate part c surrounded by the slits 2a and 2b and the broken line a downward (steel plate 1
slits 2b and 2c).
As shown in FIG. 3, the plate portion d surrounded by the dashed line a is bulged upward and deformed upward and downward, and as shown in FIG. A plurality of convex portions 4..., 4'... are formed, and the joint plate A is manufactured.

After that, as shown in Fig. 4, mesh-shaped main reinforcements 5, which become slab reinforcements (or outer wall main reinforcements), are formed.
6. Precast concrete version B with buried...
When forming the joint plate A, the convex portions 4' on the lower surface side and the flat plate portion b... are located below the upper surface of the precast concrete plate B, and the convex portions 4 on the upper surface side are By placing concrete in a state where it is arranged so as to protrude from the upper surface of the precast concrete plate B, or by pushing the splicing plate A into the above arrangement state while the poured concrete has not yet hardened. , manufactures PCa plate C for the production of synthetic floor slabs and synthetic exterior walls.

In addition, the linear slits 2a, 2b, 2c, 2d...
may be formed in the expanded metal 1' after the substantially V-shaped slits 3 are expanded. In addition, in this case, the linear slits 2a,
2b, 2c, 2d... and the bulging deformation of the convex portions 4..., 4'... can be performed simultaneously.

For example, in the above PCa version C, as shown in Fig. 5, by arranging the upper main reinforcements 7..., 8... and casting the concrete D on-site, the protrusions 4... function in the same way as stud dowels. , is a synthetic floor slab, and since the convex portions 4 are made of steel plates, the contact surface with the cast-in-place concrete D is large, and the connection (shear reinforcement) of the joints is reliable.

Fig. 6 shows another embodiment, in which a plurality of protrusions 4 are provided near the top surface of the precast concrete plate B, parallel to the row of convex portions 4 (also parallel to the linear slits 2a, 2b, 2c, 2d, etc.). The feature is that the reinforcing steel bars 9... are buried. The reinforcing reinforcing bars 9 are arranged so as to be fixed to the splicing plate A by means such as welding, and together with the splicing plate A constitute a truss surface, thereby facilitating the transmission of shear force.

The other configurations are the same as in the previous embodiment.

FIG. 7 shows another embodiment, in which after manufacturing the expanded metal 1', a plate portion surrounded by linear slits 2a, 2b and a broken line a..., linear slits 2e, 2f and a broken line a... The joint plate A is produced by bulging and deforming the plate portion surrounded by the linear slits 2c, 2d and the broken line a downward, and the plate portion surrounded by the linear slits 2c, 2d and the broken line a.

In each of the above embodiments, in order to reduce the amount of steel plate 1 used, an expanded metal 1' in which the substantially V-shaped slits 3 are enlarged is used, but as shown in Fig. 8 A and B, Linear slits 2a, 2b, 2c, 2d, 2e, 2f... are formed in a flat steel plate 1.
of the plate portions surrounded by these slits and broken lines a..., the shaded portions are bulged downward and the non-hatched portions are bulged upward to form convex portions 4..., 4. '... may be used.

In addition, in each of the above embodiments, the convex portions 4...,
4' are formed in a V-shape (that is, a shape corresponding to the hypotenuse of a triangle), but it is also possible to bulge and deform them into a trapezoid or other shape.

The present invention has the above-mentioned structure, and instead of omni-stripe, it uses a joining plate made by bulging and deforming convex parts on both the upper and lower sides of the steel plate, so welding is not required and it can be easily press-formed. Not only can protrusions be formed on the surface, but also the positional relationship between the protrusions is constant, so there is no need to worry about misalignment of the protrusions during concrete pouring when forming the PCa plate. It simplifies the muscle work and can be manufactured easily and at low cost.

Furthermore, when constructing a synthetic floor slab or the like, since the convex portion has a wide plate surface, it is possible to ensure adhesion to cast-in-place concrete and increase the bonding force of the joint. Furthermore, if expanded metal is used as the steel plate, the amount of steel material can be reduced, making it possible to further reduce costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of a steel plate, Fig. 2 is a front view of expanded metal made by stretching the same steel plate, Fig. 3 is a schematic vertical cross-sectional view of a joint plate, and Fig. 4 is used for construction methods such as synthetic floor slabs.
FIG. 5 is a vertical cross-sectional view of the composite deck slab, FIG. 6 is a vertical cross-sectional view showing another embodiment, FIG. 7 is a plan view of expanded metal in another embodiment, and FIG. Figures A and B are a plan view of a steel plate and a side view of a joint plate showing another embodiment. 1... Steel plate, 2a, 2b, 2c, 2d, 2e,
2f... linear slit, 3... approximately V-shaped slit, 4, 4'... convex portion, A... joint plate, B...
Precast concrete version.

Claims (1)

[Claims for Utility Model Registration] A plurality of linear slits are inserted into the steel plate at predetermined intervals, parallel to each other, and aligned in the direction perpendicular to the longitudinal direction of the slits. A splicing plate is formed by bulging and deforming the plate portions vertically to form a plurality of convex portions on both the upper and lower surfaces of the steel plate, respectively, and the convex portions on the upper surface side are attached to the precast concrete slab in which the main reinforcing bars are buried. PCa used in the construction method of composite floor slabs, etc., in which the PCa is buried in a state where it protrudes from the top surface of the precast concrete slab.
Edition. Utility model registration claim 1, wherein the steel plate is an expanded metal made by inserting approximately V-shaped slits intermittently in the longitudinal direction of the linear slits between the linear slits. PCa plate used in the construction method of synthetic floor slabs etc. described in .