JP7614580B2 - Concrete top marking - Google Patents

Description

The present invention relates to a concrete top edge indicator that indicates the top edge of concrete being poured based on the height position of a marker body that rotates up and down along a screw shaft that is erected in concrete.

Conventionally, devices for indicating the top edge of concrete have been disclosed in Patent Documents 1 and 2 filed by the present applicant, and Patent Document 1 discloses a configuration consisting of a base plate that is fixed to the deck plate, a support shaft (screw shaft) that is erected on the base plate, and a flexible top edge indicator consisting of three pillars that rotates up and down along the screw shaft.

Patent Document 2 discloses a rod having a level indicator that indicates the top level of the concrete being poured, and a fixing member that attaches the rod so that it can move up and down relative to the vertical reinforcement, and the top of the rod has a fitting portion formed as a cross-shaped groove into which the tip of a screwdriver or the like can be fitted, and by fitting the tip of a tool such as a screwdriver into the fitting portion and turning the rod, the height can be adjusted to indicate the top level of the concrete being poured.

Publication No. 01-148457 JP 2011-106171 A

In the conventional method described above, when adjusting the height, a general-purpose electric rotating tool such as an electric screwdriver may be used as the rotating tool to shorten the work time. However, most of the electric rotating tools these days are high-powered and have a rotation speed that is too fast for use in adjustment work, making it difficult to align them with the concrete top edge, which requires adjustments in millimeters, as they can be turned too fast by mistake. As a result, fine adjustments must be made by hand in the end.

The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a concrete top edge indicator that can be adjusted to a target height with high precision and easily by suppressing the rotation speed to a level that allows fine adjustments even when using a general-purpose electric rotating tool when adjusting a marker body that indicates the top edge of concrete to a target height.

As a means for achieving this, claim 1 of the present invention is a concrete top end indicator that indicates the top end of the concrete to be poured depending on the height position of a marker body that rotates up and down along a screw shaft that is erected into the concrete, and is characterized in that it comprises a support body with the screw shaft erected on a fixed body to be attached to a fixed material, and a marker body having a screw hole at its base that screws into the screw shaft and a display unit at its tip via a flexible connecting unit, and the display unit is provided with a fitting portion for attaching a tool for rotating the marker body, and the base is provided with an insertion hole that is continuous with the screw hole and has an insertion hole with which at least a part of the screw shaft abuts on its inner surface.

According to the concrete top edge indicator of the present invention, a fitting portion into which the tip of a rotating tool fits is provided in the display portion of the marker body, making it possible to use a rotating tool, and a through hole is provided in the base of the marker body that is continuous with the screw hole and has an inner surface against which at least a portion of the screw shaft abuts.Even when an electric rotating tool is used, the rotation speed is suppressed as part of the inner surface of the insertion hole abuts against the screw shaft, making it possible to easily and precisely adjust to the target height, and also reducing the labor required for manual fine adjustments.

FIG. 1 is a perspective view of an embodiment of the present invention. FIG. 2 is a central cross-sectional view of FIG. 1 . 2A is a cross-sectional view showing the through hole in FIG. 1, and FIG. 2B is a plan view showing the fitting portion in FIG. 10 is a cross-sectional view showing another embodiment of a protrusion provided in a through hole of the present invention. FIG. FIG. 11 is a plan view showing another embodiment of the fitting portion of the present invention. FIG. 11 is an explanatory diagram showing another embodiment of the fixing material of the present invention. FIG. 2 is a cross-sectional view showing a state in which the present invention is used.

Hereinafter, an embodiment will be described with reference to the drawings.
As shown in Figures 1 to 3, a concrete top edge indicator 1 according to an embodiment of the present invention is composed of a marker body 100 for indicating the top edge of concrete, and a support body 200 having a screw shaft 220 attached to a thin plate-shaped fixed body 210. The marker body 100 is made of synthetic resin and is integrally molded, and has a base 110, three columnar, flexible connecting parts 120, and an indicator part 130 formed at the tip of each connecting part.
An insertion hole 111 through which the screw shaft 220 is inserted is provided in approximately the center of the base 110, and a screw hole 112 is formed below and coaxially with the insertion hole 111 by providing a nut 113 that screws onto the screw portion 221.
Three protruding pieces 114 are formed on the inner peripheral surface of the insertion hole 111 so as to protrude toward the center and come into contact with the outer peripheral portion of the screw shaft 220 .
When the marker body 100 is rotated up and down along the screw shaft 220, this protruding piece 114 comes into contact with the outer periphery of the screw shaft 220, thereby providing resistance to rotation and having the effect of suppressing the rotation speed.

Also, as shown in FIG. 4, it may abut against two faces (a) of the inner circumferential surface of the insertion hole or the entire surface (b) of the inner circumferential surface. However, the point is that the larger the area of the protruding piece 114 abutting against the outer periphery of the screw shaft 220, the greater the resistance and the greater the inhibition of rotation. Therefore, it is only necessary to set it so as to obtain the desired rotation speed.

A cross-groove-shaped fitting portion 131 is formed in the approximate center of the display portion 130 of the marker body 100, and a display piece 132 is provided on the edge portion.
The fitting portion 131 has a cross groove shape, but it need only fit onto the tip of a rotating tool. As shown in FIG. 5, it may have a hexagonal groove shape (a) or a square groove shape (b). Furthermore, as shown in (c), the outer shape of the display portion 130 may be a regular hexagon so that it fits into a hexagonal socket.
In addition, since the marker body 100 is made of flexible synthetic resin, even if it hits a pressure pipe or hose used for pouring concrete, it will bend temporarily, but can return to its original shape, and the display unit 130 will always show the specified height, making it possible to use it as a landmark for the top of the concrete.

As described above, the fixing body 210 of the support body 200 is in the form of a thin plate having screw holes 211 formed therein, and can be fixed by screwing in a steel formwork as the object to be fixed.

The fixing body attached to the fixed material of the support body 200 is in the form of a thin plate here, but as shown in Figure 6, the fixed material may be a wooden concrete formwork and may be in the form of a synthetic resin base with nail holes (Figure 6(a)), or may have nails attached to the base (not shown).
The fixed member may be a reinforcing bar embedded in concrete, and may be fixed by being clamped between rod-shaped reinforcing bars (FIG. 6(b)). The fixing body may have another configuration as long as the screw shaft is erected in the thickness direction of the concrete being poured (not shown).

The manner of use of the concrete top end indicator thus constructed will be described below. As shown in FIG. 7, the fixing body 210 is fixed to the deck plate A with a screw B, and the screw shaft 220 is erected.
The bit of the electric rotary tool C is fitted into the fitting portion 131 of the marker body 100, and the marker body 100 is moved vertically by rotating the display portion 130 so that it coincides with the target concrete top edge D, thereby adjusting the height.
By extending the tip of the electric rotary tool C, such as a long bit, the height of the marker body can be adjusted while standing (not shown).
Thereafter, concrete is poured to fit the display portion 130, and after the concrete has cured, the display piece 132 is cut out and removed, but the support 200 and the marker body 100 are left embedded.

1 Concrete top display device 100 Marker body 110 Base 111 Through hole 112 Screw hole 113 Nut 114 Protruding piece 120 Connecting part 130 Display part 131 Fitting part 132 Display piece 200 Support body 210 Fixing body 211 Screw hole 220 Screw shaft 221 Screw part 300 Synthetic resin base 310 Nail 400 Fixing body for reinforcing bar A Deck plate B Screw C Electric rotary tool D Concrete top E Wooden concrete formwork F Reinforcing bar

Claims (1)

A concrete top end indicator that indicates the top end of concrete to be poured by the height position of a marker body that rotates up and down along a screw shaft that is erected in concrete,
The present invention is provided with a support body having the screw shaft erected on a fixing body to be attached to a fixed material, and a marker body made of synthetic resin having a nut at its base to be screwed onto the screw shaft and a display section at its tip via a flexible connecting section,
A concrete top edge indicator characterized in that the display unit is provided with a fitting portion for attaching a tool for rotating the marker body, and the base unit has an insertion hole formed of the synthetic resin above the nut , separate from the nut, with at least a portion of the screw shaft abutting against its inner surface.

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