JPH0745760B2 - Cap-shaped spacer and device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention secures a space between an end portion of a reinforcing bar and a formwork and manufactures a reinforced concrete product such as a road gutter or a drainage pipe. In order to prevent rusting, the present invention relates to a cap-shaped spacer for reinforcing bar rust which is covered on each end of the reinforcing bar and a device used for driving the spacer.

[Conventional technology]

Manufacturing of reinforced concrete such as road gutters and drainage pipes is usually done by assembling the reinforced concrete into a predetermined shape as shown in FIG.
51 is housed in formwork 52a and 52b, and the rebar inside this formwork 52 is
Various spacers between the inner wall of the form and the rebar to fix the 51 in the designed position until the ready-mixed concrete hardens.
In order to secure a distance (fog) from the mold 52b and to prevent rusting, the sixth part 53 is provided especially at the end 54 of the reinforcing bar.
As shown in FIGS. A and B, a cap-shaped synthetic resin rust preventive spacer 55 is put on the end portion of the cap, and fresh concrete is poured and cured.

[Problems to be solved by the invention]

However, the work of covering the end of the reinforcing bar with the cap-shaped spacer is very inefficient because the worker picks up each spacer one by one and pushes it into the end of the reinforcing bar, and it is very inefficient. Inner diameter of 2.6 ~ 16 mm
Since the spacer has a small size such that the length is 15 to 30 mm, the work of attaching the spacer is very troublesome.

In addition, it may be necessary to hit the spacer with a hammer or the like after covering the end of the reinforcing bar with the spacer so that the spacer does not fall off. Furthermore, since the inner diameter of the cap must be made to roughly match the outer diameter of the reinforcing bar by hand, spacers of various sizes are prepared according to the size of the reinforcing bar.Because the spacer is small, pay close attention. Must be paid and stored.

The present invention has been made based on the above-mentioned background, and an object of the present invention is to make it possible to cover the end of the reinforcing bar with a cap-shaped spacer efficiently and easily, and to make the spacer easy to prepare and store. To provide a spacer and a device using the same.

[Means for solving problems]

The present inventor has studied various reinforcing bar rust preventive spacers in order to solve the above problems, and found that a continuous shape in which the spacers are connected in series is effective in achieving the object of the present invention. The invention was completed.

Ie. The reinforcing bar rust preventive spacer of the present invention comprises a plurality of reinforcing bar rust preventive cap-shaped spacers to be put on the end portions of the reinforcing bar assembled in a predetermined shape, and connecting the spacers in series and applying external force to the reinforcing bar. It is characterized in that it comprises a connecting portion for easily detaching the spacer. In a preferred aspect of the present invention, the spacer and the connecting portion may be integrally molded into a flexible plastic molded product having tensile strength.

A device using the continuous spacer of the present invention is a device for driving a rebar rust preventive cap-shaped spacer to be put on the end of a rebar assembled in a predetermined shape from a launch port toward the end of the rebar, A loading unit that holds a spacer composed of a plurality of the spacers and a connecting unit that connects the Susers in series, and automatically loads one spacer to the launch port, and imparts acceleration force to the loaded spacers. An automatic driving device for a cap-shaped spacer for rustproofing a reinforcing bar, comprising: a power unit having a mechanism for controlling the power unit; and a control unit for controlling the power unit.

[Action]

Since the present invention is configured as described above, it operates and operates as follows.

A mode of using the automatic driving device for the cap-shaped spacer for rustproofing the reinforcing bars will be described. First, a rebar assembled in a predetermined form and a predetermined shape is prepared, and the continuous spacer of the present invention is held in the loading section of the automatic driving device. The launcher is directed to the end of the reinforcing bar, and the power unit is launched via the control unit to launch one loaded spacer. At this time, the connecting portion easily separates the spacer by the external force from the power unit, and the spacer to be fired is separated from a series of other spacers. Next, one spacer is automatically loaded in the firing port, and the spacers are connected in series, so that the other spacers are also sequentially advanced to enable the next firing. This work is repeated to complete the step of attaching the cap-shaped spacer to the end of the reinforcing bar, and then pouring and curing fresh concrete into the mold containing the reinforcing bar to manufacture a reinforced concrete product.

〔Example〕

 The present invention will be described with reference to specific examples.

An external view of an embodiment of the cap-shaped spacer according to the present invention is shown in FIG. In this continuous cap-shaped spacer 1, a plurality of reinforcing bar rust-preventive cap-shaped spacers 2a to 2h
And connecting portions 3a to 3g for connecting the spacers in series. In this state, the connecting portions 3a to 3g are in the form of thin films at regular intervals. However, the present invention is not limited to this aspect and various modifications are possible. For example, as shown in FIGS. 2A and 2B, one or a plurality of thread-shaped connecting portions 3 may be used, and further, as shown in FIG. 3, a spacer and an adjacent spacer may be directly bonded. You may. In that case, the space between the directly joined spacers is the connecting portion.

The material of the spacer is not particularly limited as long as it does not defeat the purpose of the reinforcing bar rust preventive material, and various materials can be used. As such, for example, polyethylene,
Polyvinyl chloride, polypropylene, polystyrene, ABS
Resin, acrylic resin, polyamide resin, polyester resin, polyester resin, polycarbonate resin, polyacetal resin, fluororesin, thermoplastic resin such as cellulose resin, epoxy resin, acrylic resin, melamine resin, thermosetting resin such as urea resin, Hard synthetic rubber is available. The preferred material for the spacer in the present invention is inexpensive and has excellent strength, elongation and impact resistance. By using a spacer with such excellent strength, elongation, and impact resistance, it is possible to use a spacer having an inner diameter smaller than the outer diameter of the reinforcing bar, and it is necessary to arrange several kinds of spacers aligned with the outer diameter of the reinforcing bar. Disappears.

When plastic is used as the material of the spacer, the gate (molten resin injection hole) portion at the time of extrusion molding of the spacer can also serve as the connecting portion in the present invention.

Next, an embodiment of the automatic driving machine according to the present invention will be described. FIG. 4 is a schematic diagram for schematically explaining this example.
In the automatic driving machine 41 of this aspect, the reinforcing bar rust-preventing cap-shaped spacer 2a to be put on the end 42 of the reinforcing bar assembled in a predetermined shape is continuously driven from the firing port 44 toward the end of the reinforcing bar. It is a device. This device holds a continuous spacer 1 composed of a plurality of the spacers and a connecting portion 3 connecting the spacers in series, and a loading unit (not shown) that automatically loads one spacer to the ejection port. ), A power unit having a mechanism for applying an acceleration force to the loaded spacer 2a, and a control unit for controlling the power unit. It is desirable that the device is portable because the place of use of the device is a work site and it is necessary to move the device without moving the reinforcing bar. In this example, the power unit is an electromagnet forming solenoid 47 provided in the longitudinal direction at the center of the main body, and a rod-shaped hammer 48 that passes through the center of the solenoid and is directed to the launch port.
And a magnet 49 fixed to the hammer end on the side opposite to the firing port
And a power source 43 for driving the electromagnet. In this example, the control unit is the switch 45 of the power supply, and the power supply is obtained from the rectifier 43 that rectifies the external AC power supply into DC.

The operation of using the device will be briefly described. The continuous spacer 1 is held in the loading section before use. Then, the reinforcing bar end 42 is directed to the firing port 44 of the device, the switch knob 46 is pressed to close the switch 45 to form an electromagnet in the solenoid 47, and the hammer 48 fixed to the magnet 49 is driven to move the loaded spacer 2a. Extrude. The extruded spacer is strongly inserted into the end 42 of the rebar. The moved hammer 48 is immediately returned to its original position, and at the same time, an automatic loading mechanism (not shown) automatically loads a single spacer into the firing port. The driving operation can be performed by repeating this operation.

The present invention is not limited to this example, and various modifications are possible. For example, a spring or air pressure may be used for the power unit.

〔The invention's effect〕

The following effects can be obtained by the continuous spacer and the apparatus thereof according to the present invention.

(A) It is not necessary to pick up the spacers one by one, and the spacers can be continuously covered on the longitudinal end portions of the reinforcing bar, so that the work can be performed efficiently and efficiently.

(B) By increasing the power of the power unit of the device, a strong spacer can be easily attached, and a hammering process by a hand hammer or the like is not required.

(C) By using a plastic having a high tensile strength to drive it strongly, even a spacer having an inner diameter slightly smaller than the outer diameter of the reinforcing bar can be used, and therefore it is not necessary to prepare and store spacers of various sizes.

[Brief description of drawings]

FIG. 1 is a partial external view showing a cap-shaped spacer of an embodiment according to the present invention, FIGS. 2-3 are partial external views showing a modified example of the present invention, and FIG. 4 is an example of an apparatus using a continuous spacer according to the present invention. FIG. 5 is a perspective view showing a formwork and reinforcing bars in a concrete product manufacturing process, and FIG. 6 is a cross-sectional view of a conventional cap-shaped spacer. 1 ... Continuous cap-shaped spacer, 2 ... Spacer, 3 ...
Connection part, 41 ... Automatic driving device, 42 ... Reinforcing bar end, 43 ... Rectifier, 44 ... Launch port, 45 ... Switch, 46 ... Knob, 47 ... Solenoid, 48 ... Hammer, 49 ... Magnet, 51 ... Rebar, 52 ... Formwork,
53 ... spacers, 54 ... ends, 55 ... spacers.

Claims (4)

[Claims] 1. A plurality of rebar rust-preventive cap-shaped spacers to be put on the longitudinal ends of rebars assembled in a predetermined shape, and the spacers are connected in series and easily applied by an external force applied to the rebars. A cap-shaped spacer that secures a space between the mold and the reinforcing bar, which is composed of a connecting portion that separates the spacer. 2. The cap-shaped spacer according to claim 1, wherein the spacer is made of a flexible plastic having high tensile strength. 3. The cap-shaped spacer according to claim 1 or 2, which is a plastic molded product in which the spacer and the connecting portion are integrally molded. 4. A device for driving a reinforcing rod rust-preventive cap-shaped spacer, which is to be put on the longitudinal end portion of a rebar assembled in a predetermined shape, from a launching port toward the rebar end portion, and comprising: A loading section that holds a cap-shaped spacer composed of the spacer and a connecting section that connects the spacer in series, and a loading section that automatically loads a single spacer to the firing port, and an accelerating force is applied to the loaded spacer. An automatic driving device for a cap-like spacer for rustproofing a reinforcing bar, comprising a power unit having a mechanism and a control unit for controlling the power unit.