JP3078169U - Rebar cover thickness measurement ruler - Google Patents

Abstract

(57) [Problem] To provide a rebar cover thickness measurement ruler capable of accurately measuring a rebar cover thickness with a simple operation. SOLUTION: A reference portion 4 to be brought into contact with an inner surface of a formwork for constructing a reinforced concrete structure on one side surface of a ruler body portion 3 is brought into contact with a side surface of a reinforcing bar facing the inner surface of the formwork on another side surface. And a measuring unit 5. A plurality of measuring points p are formed in the measuring section 5 in such a manner that the distance to the form surface when the reference section 4 is brought into contact with the form surface is gradually increased. Is displayed as a number 8a representing the distance L of
While applying the reference part 4 to the inner surface of the mold, insert the measurement part 5 until it comes into contact with the reinforcing bar. At this time, the numeral 8a of the measurement point p at which the reinforcing bar abuts indicates the distance from the formwork to the reinforcing bar, that is, the reinforcing bar cover thickness.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a ruler for measuring a reinforcing bar cover thickness when constructing a reinforced concrete structure, that is, a distance between a reinforcing member and a formwork for placing concrete.

[0002]

[Conventional technology and problems to be solved]

 In the reinforced concrete structure framing or rebar construction, whether or not the reinforced cover thickness is as specified in the design documents such as the common specifications will affect the skeleton performance after completion. For this reason, the work of measuring the rebar cover thickness before concrete casting is performed. Conventionally, this rebar cover thickness measurement work is performed by, for example, applying the tip of a metal tape measure C to the rebar S, pulling out the tape measure C, and measuring the distance to the form F as shown in FIG. I was going.

However, in such a conventional measuring method, since the reinforcing bar has a circular cross section, an error occurs in the measurement result depending on the direction of observation, or when the reinforcing bar is complicated, the above-described measuring operation is not performed. There was a problem that it was difficult. The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a rebar cover thickness measuring ruler capable of accurately measuring a rebar cover thickness with a simple operation even in a complicated rebar structure. The purpose is.

[0004]

[Means for Solving the Problems]

 The first invention is a measurement in which one side of the measuring ruler is brought into contact with the inner surface of a formwork for constructing a reinforced concrete structure, and the other side is brought into contact with the side surface of the reinforcing bar facing the inner surface of the formwork. Unit. A plurality of measuring points are formed in the measuring section in such a manner that the distance to the form surface when the reference section is brought into contact with the form surface is gradually increased, and the distance to the form surface is measured at the measuring point. Displays a number representing the cover thickness.

In a second aspect of the present invention, the measuring section of the first aspect of the present invention is formed as an inclined surface that forms a predetermined angle with respect to a mold surface.

According to a third aspect of the present invention, the measuring section of the first aspect is formed in a step shape in which a distance changes stepwise with respect to a mold surface.

In a fourth aspect of the present invention, the numeral representing the cover thickness is displayed so that the ruler is turned upside down when the tapered end of the ruler faces downward.

In a fifth aspect of the present invention, a numeral or a scale indicating the length from the tapered end of the ruler is formed in the reference portion of each of the above-described devices along the longitudinal direction of the reference portion.

[0009]

[Effect of the invention]

 In order to measure the reinforcing bar cover thickness according to the present invention, the ruler is inserted between the concrete form to be measured and the reinforcing bar from the tapered end of the ruler so that the ruler is substantially perpendicular to the reinforcing bar. At this time, insert the reference part to the inner surface of the form so that the ruler keeps a substantially right angle to the reinforcing bar, and insert it until the measuring part comes into contact with the reinforcing bar. The number at the measuring point where the reinforcing bar abuts is the distance from the inner surface of the formwork to the measuring point, that is, the reinforcing bar cover thickness.

[0010] According to the present invention, it is possible to accurately measure the rebar cover thickness with a simple operation in this way, and it is also possible to accurately measure a portion that was difficult to measure in the past. Thus, the effect that the accuracy of the measurement can be further improved is obtained.

[0011]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in more detail based on embodiments. In FIG. 2, a reinforcing bar cover thickness measuring ruler 1 is composed of a grip portion 2 for an operator to hold by hand at the time of measurement and a ruler body portion 3 for measurement made of a thick plate material such as plastic or metal. It is formed in. The ruler main body 3 has a linear reference portion 4 serving as a measurement reference on one of its two side edges, and a tapered substantially triangular shape on the end opposite to the grip portion 2, on the other side. The measuring units 5 are formed so as to form a predetermined angle θ with respect to the reference unit 4.

In the reference portion 4, a numeral 7 a and a scale 7 b representing the length from the tapered side end portion 6 of the ruler body 3 are written in the longitudinal direction. On the other hand, the measuring unit 5 has a numeral L indicating a distance L from the reference unit 4 to a measuring point p (in this case, a plurality of points set at predetermined intervals on the edge of the measuring unit 5). 8a and graduations 8b are entered at predetermined intervals along the measuring section 5. The numeral 8a is written such that the top and bottom are inverted when the tapered side end 6 of the ruler is turned downward as shown in the figure. This is because the number 8a is observed by observing the ruler 1 from above at the time of measurement, so that the readability at this time is taken into consideration. In this embodiment, the measuring points p are provided at eight positions on the measuring section 5, but a large number of measuring points p may be provided at finer intervals.

In order to measure the rebar cover thickness by using the ruler 1, the ruler 1 is placed between the concrete form F to be measured and the rebar S as shown in FIG. The ruler is inserted from the tapered end 6 of the ruler at a right angle. At this time, the reference portion 4 is applied to the inner surface of the form F so that the ruler 1 keeps a substantially right angle to the reinforcing bar, and the measuring portion 5 is inserted until it comes into contact with the reinforcing bar S. The numeral 8a of the measurement point p at which the reinforcing bar S abuts indicates the distance L from the mold F to the reinforcing bar S, that is, the reinforcing bar cover thickness.

At the time of measurement, the reference portion 4 of the ruler 1 may not be directly in contact with the formwork F, but may be indirectly contacted with a plate or square member having a constant thickness interposed therebetween. Reinforcement cover thickness exceeding the maximum measurement range of 1 can be measured. Also, since the ruler 1 of this embodiment is provided with a numeral 7a and a scale 7b representing the length from the tapered side end 6, for example, the height from the bottom of the form F to the rebar S or the rebar It can also be applied to applications such as measuring the distance between the objects.

By the way, in this embodiment, since the measuring portion 5 is an inclined surface, the contact portion with the reinforcing bar S is slightly higher than the center of the reinforcing bar, so that the reading of the measuring point p is the actual overlay thickness. Slightly larger than the dimensions. Therefore, if strictness is required, this error is compensated as follows, for example. That is, when the angle formed by the measuring part 5 with respect to the inner surface of the formwork or the reference part 4 is θ, and the outer diameter of the reinforcing bar S is d, the error Δt in the cover thickness direction is Δt = (d / 2) ( 1−cos θ). If a value obtained by subtracting this error from the actual dimension of each measurement point p is entered as a numeral 8a, the reading as it is indicates a more accurate cover thickness. On the other hand, when it is not necessary to measure the rebar cover thickness so strictly and it is sufficient to know that the rebar cover thickness is within a certain allowable range, the measuring section 5 is not formed by a linear slope, but is formed by a mold. It may be formed in a step-like shape in which the distance changes stepwise with respect to the surface, which simplifies the work of measuring the cover thickness.

In this embodiment, the reference portion 4 is formed in a straight line so as to make line contact with the formwork surface. The shape may be such that point contact or partial contact is made. By doing so, the cover thickness can be measured without any problem even when, for example, there is a projection on the form surface facing the reinforcing bar.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a conventional reinforcing bar cover thickness measuring method.

FIG. 2 is a front view of one embodiment of a rebar cover thickness measurement ruler according to the present invention.

FIG. 3 is an explanatory view showing a reinforcing bar cover thickness measuring method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMBERS 1 Rebar cover thickness measurement ruler 2 Handle part 3 Ruler body 4 Reference part 5 Measurement part 6 Tapered side end 7a Number 7b Scale 8a Number 8b Scale p Measurement point F Formwork L Typical length of rebar cover thickness S Rebar

Claims (5)

[Utility model registration claims] 1. A reference portion for contacting an inner surface of a formwork for constructing a reinforced concrete structure, and a measuring portion for contacting a side surface of a reinforcing bar facing the inner surface of the formwork, wherein the measuring portion includes a reference portion. A plurality of measurement points are formed in such a manner that the distance to the form surface when the abutment with the form surface is gradually increased, and at the measurement points, a number representing the distance to the form surface as a reinforcing bar cover thickness is displayed. Rebar cover thickness measurement ruler. 2. The rebar cover thickness measuring ruler according to claim 1, wherein the measuring portion is formed in an inclined surface form a predetermined angle with respect to the mold surface. 3. The rebar cover thickness measuring ruler according to claim 1, wherein the measuring portion is formed in a stepped shape in which the distance changes stepwise with respect to the mold surface. 4. The reinforcing bar cover according to claim 1, wherein the number representing the cover thickness is displayed upside down when the tapered end of the ruler is directed downward. Thickness measuring ruler. 5. The reference portion according to claim 1, wherein a number or a scale representing the length from the tapered end of the ruler is formed along the longitudinal direction of the reference portion. Rebar cover thickness measurement ruler.