JP2871533B2 - Precast concrete plate and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete plate and a method for producing the same.

[0002]

2. Description of the Related Art Generally, as a precast member such as a floor or a wall, as shown in FIG.
A precast concrete plate 31 having a plurality of zeros is often used.

[0003] On the upper surface of the precast concrete plate 31, a circular shear cotter 32 is provided. This is for increasing the bonding strength with the post-cast concrete, and is provided at a ratio of about 30% of the surface area.

[0004]

The ratio of the shear cotter on the surface of the concrete plate greatly affects the bonding strength with the concrete to be cast. However, in the past, this ratio could not be uniformly increased or decreased arbitrarily, so the ratio was varied according to the design conditions. The adhesive strength could not be set.

The present invention has been made in view of such a problem, and an object of the present invention is to easily and surely form a shear cotter on a precast concrete plate and arbitrarily increase or decrease the ratio of the shear cotter on the surface of the precast concrete plate. To set the adhesive strength according to the design conditions.

[0006]

Means for solving the above-mentioned problem is that a concrete placing machine is installed while moving.
Move the concrete placing machine on the concrete surface
A vertical groove is formed with a vertical groove cutting blade that moves together.
The cross groove that intersects this vertical groove intersects the vertical groove cutting blade
It is formed by a horizontal groove cutting blade that reciprocates right and left.

[0007]

[ Function ] A concrete placing machine that moves while moving
With the movement of the concrete placing machine on the surface of the concrete
Form a vertical groove with a vertical groove cutting blade that moves to
The horizontal groove that intersects the vertical groove of the right and left
Casting by forming with a reciprocating horizontal groove cutting blade
Grid-like grooves can be formed on the concrete surface.

[0008] On one side of the precast concrete plate body
The formation of the grid-like grooves allows the precast
Design ratio of shear cotter on cleat plate surface
It can be arbitrarily increased or decreased according to the case.

[0009] By forming the lattice-shaped groove, precast
Also supports the forces acting on the concrete plate in the X and Y directions
The strength of the joint with post-cast concrete
It can be set in advance.

[0010] grid network size or lattice shape of can be arbitrarily set.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a precast concrete plate of the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a sectional view of a groove.

The precast concrete plate 1 is a slender plate as a whole. Inside the main body, hollow holes 2 penetrating along the longitudinal direction are provided in parallel in order to reduce the weight and extend the span. The PC steel wire 3 is buried in the upper and lower positions in a tensioned state.

On the upper surface of the precast concrete plate 1, a lattice-shaped groove 4 composed of a vertical groove 4a and a horizontal groove 4b is formed to serve as a shear cotter for strengthening the adhesion to the post-cast concrete. There are a trapezoidal cross section, a U shape, a square shape, a curved shape, and the like as shown in FIG.

The ratio of the groove 4 on the concrete surface largely depends on the bonding strength with the concrete to be cast, and is determined according to design conditions.

FIGS. 4 and 5 show a precast concrete plate 1 provided with another lattice-shaped groove 4. Thus, the lattice-shaped groove 4 can be formed in any shape without being limited to these shapes.

Next, a method of manufacturing a precast concrete plate will be described with reference to FIGS. The production of the precast concrete plate is performed by using a concrete placing machine 5 as shown in FIG. 6, which moves above a long bottom template 6 called a bed.

The concrete casting machine 5 is provided with a hopper 7 for driving concrete, and concrete 9 is cast from a lower opening 8 facing the bottom template 6.

At the rear of the concrete placing machine 5, a vertical groove cutting blade 10 is arranged and supported by a support frame 11 projecting from the rear of the concrete placing machine 5.

This vertical groove cutting blade 10 is provided with five cutting blades 13 on a long plate 12 disposed to intersect with the concrete 9 to be cast, and has a tapered tip as shown in FIG. , A trapezoidal shape, a curved surface shape, or a simple rod shape. In addition, the number of the cutting blades 13 and the shape of the tip portion are selected according to the use location of the precast concrete plate 1 and other design conditions.

A horizontal groove cutting blade 14 is disposed behind the vertical groove cutting blade 10 and is moved up and down by a hydraulic jack 15 supported by a support frame 11. Horizontal groove cutting blade 14
The four cutting blades 1 are attached to the long plate 12 similarly to the vertical groove cutting blade 10.
3, the engaging member 16 on the upper surface of the long plate 12 is slidably engaged with the guide rail 18 of the fixed frame 17, and the long plate 12 is driven by the drive gear 19 and the driven gear 20 of the fixed frame 17. And the connecting tool 2 on the chain 21
2 are connected.

Therefore, the lateral groove cutting blade 14 is
By the rotation of the chain 21 due to the forward and reverse rotation of the above, the reciprocating motion can be performed along the short side direction of the concrete 9 to be poured.

The rotation speed and rotation interval of the drive gear 19 are determined according to the shape of the lattice-shaped grooves 4 formed on the upper surface of the concrete 9 and the size of the lattice.

The method of manufacturing the precast concrete plate 1 by using such a concrete placing machine 5 is as follows. First, a number of PC steel wires 23 are laid on the bottom template 6, and both ends thereof are fixed to the end support frame 24. Tension in advance.

Then, side molds 25 are arranged in parallel on both sides of the PC steel wire 23, and the ends thereof are connected to the front plate 26 of the concrete placing machine 5, and the front plate 26 The core 27 forming the hollow hole 2 is attached to the PC steel wire 23, and is disposed between the PC steel wires 23 so that the side-side formwork 25 and the core 27 move with the movement of the concrete placing machine 5. It has become.

Next, five vertical grooves 4a are formed on the upper surface of the casting concrete 9 by the vertical groove cutting blade 10 moving together with the concrete setting machine 5, and the horizontal groove cutting blade 14 is changed to the vertical groove cutting blade. By traversing the direction perpendicular to 10, that is, across the cast concrete 9, four transverse grooves 4b perpendicular to the longitudinal grooves 4a are formed.

As shown in FIG. 9, the horizontal groove cutting blade 14 rises once across the concrete 9 and lowers again after the concrete placing machine 5 advances by one unit of the horizontal groove 4b. On the contrary, four transverse grooves 4b which are perpendicular to the longitudinal grooves 4a are formed across the cast concrete 9.

As described above, the lattice-shaped grooves 4 are formed on the concrete 9 by the reciprocating movement of the vertical groove cutting blades 10 and the horizontal groove cutting blades 14 at predetermined intervals in accordance with the movement of the concrete setting machine 5. Is formed.

The shape of the grid-shaped grooves 4 and the size of the grids are determined by the number of the cutting grooves 13 in the vertical groove cutting blades 10 and the horizontal groove cutting blades 14 and the vertical operation of the horizontal groove cutting blades 14. Determined by the interval. Therefore, these can be arbitrarily set according to design conditions.

For example, the precast concrete plate 1 shown in FIG. 4 is one in which the transverse groove cutting blade 14 rises while being traversed on the concrete 9 to form a transverse groove 4a of an appropriate length.

In addition, as shown in FIGS. 10 and 11,
By rotating the horizontal groove cutting blade 14 with the motor 14a, the lattice groove 4 in which the horizontal groove 4b is curved can be formed. FIG. 10 shows the case where the number of the cutting blades 13 is four, and FIG. It shows the case. The horizontal groove cutting blade 14 also moves up and down by the hydraulic jack 15. Thus, the shape of the lattice can be arbitrarily formed in accordance with the adhesive strength with the post-cast concrete.

FIG. 12 shows that the horizontal groove cutting blade 14 forms the horizontal groove 4b while moving along with the movement of the concrete placing machine 5, and the portal form 28 is formed on both sides of the bottom form 6. Travels on the rail 28a laid on the vehicle.

Further, FIG. 13 shows that the lateral groove 4b is formed by the roller 29 rotating with the movement of the concrete placing machine 5, and an arbitrary lateral groove 4b is formed by the shape of the cutting edge 13 of the roller 29. For example, if the cutting blade 13 is the roller 2
If the length is the same as 9, a lateral groove 4b as shown in FIG. 1 is formed, and if short cutting edges 13 are provided at appropriate intervals, the lateral groove 4b as shown in FIG. 4 is formed. The roller 29 can be moved up and down by a lifting device such as the hydraulic jack 15.

[0033]

According to the present invention, a concrete placing machine is driven while moving.
Of concrete placing machine on the concrete surface
A vertical groove is formed with a vertical groove cutting blade that moves with
The cross groove that intersects this vertical groove intersects the vertical groove cutting blade
By using a horizontal groove cutting blade that reciprocates right and left
A grid-like groove can be formed on the surface of the cast concrete.

On one side of the precast concrete plate body
The formation of the grid-like grooves allows the precast
Design ratio of shear cotter on cleat plate surface
It can be arbitrarily increased or decreased according to the case.

Grid on the upper surface of precast concrete plate
Work in X direction and Y direction by forming groove
Connection with post-cast concrete
The proof stress of the part can be set in advance.

The grid network size or lattice shape of can be arbitrarily set.

[Brief description of the drawings]

FIG. 1 is a perspective view of a precast concrete plate.

FIG. 2 is a cross-sectional view of a precast concrete plate.

FIG. 3 is a sectional view of a groove.

FIG. 4 is a plan view of a precast concrete plate having another lattice-shaped groove.

FIG. 5 is a plan view of a precast concrete plate provided with another lattice-shaped groove.

FIG. 6 is a sectional view showing a method for manufacturing a precast concrete plate.

FIGS. 7 (1) to (4) are front views of the tip of the cutting blade.

FIGS. 8 (1) and (2) are cross-sectional views showing a method of operating a horizontal groove cutting blade.

FIG. 9 is a plan view showing an operation method of the horizontal groove cutting blade.

FIG. 10 is a sectional view of a method for manufacturing a precast concrete plate using a rotating horizontal groove cutting blade, and FIG. 10B is a plan view of the same.

FIG. 11A is a cross-sectional view of a method for manufacturing a precast concrete plate using a rotating horizontal groove cutting blade, and FIG. 11B is a plan view of the same.

FIG. 12 is a cross-sectional view of a method for manufacturing a precast concrete plate using a self-propelled horizontal groove cutting blade, and FIG.

FIG. 13 is a cross-sectional view of a method for manufacturing a precast concrete plate using rotating rollers.

FIG. 14 is a perspective view of a conventional precast concrete plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete board 2 Hollow hole 3 PC steel wire 4 Groove 5 Concrete casting machine 6 Bottom template 7 Hopper 8 Lower opening 9 Casting concrete 10 Vertical groove cutting blade 11 Support frame 12 Long plate 13 Cutting blade 14 Horizontal Groove cutting blade

Claims (1)

(57) [Claims] 1. A concrete placing machine is moved while moving
Of concrete placing machine on the concrete surface
A vertical groove is formed with a vertical groove cutting blade that moves with
The cross groove that intersects this vertical groove intersects the vertical groove cutting blade
Characterized by a horizontal groove cutting blade that reciprocates left and right
Manufacturing method of a precast concrete plate.