CN102226680A - Measurement of inner arc radius of bent steel bar - Google Patents

Abstract

The pair of rulers for measuring the radius of the inner arc of the bent steel bar comprises a pair of cross rulers made of transparent materials, wherein longitudinal scales of the pair of cross rulers are respectively positioned on the right side and the left side of the longitudinal rulers, transverse scales are respectively positioned on the lower sides of the transverse rulers, and the longitudinal scales and the transverse scales of each cross ruler are respectively divided up and down and left and right at the intersection of the scales. The center of the steel bar arc is obtained by utilizing the intersection of the scales of the longitudinal scales of the pair of cross scales, and once the center of the circle is determined, the inner diameter of the arc can be easily read, so that the invention has simple structure and simple and accurate measurement method.

Description

Measurement of inner arc radius of bent steel bar

【Technical field】

The invention relates to a measuring instrument for construction, in particular to a measuring ruler for measuring the bending radius of steel bars for construction.

【Background technique】

We know that our country has certain requirements for steel bars for construction after bending, and its bending inner diameter R≥4d (the diameter of the steel bar). At present, in actual application, the radius is pre-selected by the size of the bending axis on the steel bending machine. Whether the inner diameter of the steel bar after bending meets the requirements is currently not tested by special instruments or equipment. For this reason, the applicant specially A pair of measuring rulers with simple structure but accurate measurement has been developed.

【Content of invention】

The object of the present invention is to overcome the deficiencies of the prior art and provide a measuring ruler for measuring the inner arc radius of bent steel bars with simple structure and accurate measurement.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A pair of rulers for measuring the inner arc radius of bent steel bars, which includes a pair of cross rulers made of transparent materials. The longitudinal scales of the pair of cross rulers are respectively located on the right and left sides of the longitudinal ruler, and the horizontal scales are located on the lower side of the horizontal ruler. , the vertical and horizontal scales of each cross ruler are respectively marked up and down, left and right at the intersection of their scales as the starting point.

In the improved plan for measuring the radius of the inner arc of the bent steel bar, the scale length of the longitudinal ruler below the horizontal ruler is 4 to 8 times the length of the scale above the horizontal ruler.

Compared with the prior art, the present invention has the following advantages: because it utilizes the intersection of the vertical ruler scales of a pair of cross rulers to obtain the center of the arc of the steel bar, once the center of the circle is determined, the inner diameter of the arc can be easily read Therefore, the structure of the present invention is simple, and the measurement method is simple and accurate.

Below in conjunction with accompanying drawing and specific embodiment the present invention is further described:

【Description of drawings】

Fig. 1 is the front view of the embodiment of the present invention;

Fig. 2 is a partial enlarged view I of Fig. 1;

Fig. 3 is a partially enlarged view II of Fig. 1;

Fig. 4 is a schematic diagram after placing one of the measuring rulers during measurement in the embodiment of the present invention;

Fig. 5 is the schematic diagram after another measuring ruler is placed during measurement in the embodiment of the present invention.

【Detailed ways】

The present invention is a measuring ruler for inner arc radius of bent steel bar, which utilizes that the center of the arc must be on the midline of the line connecting any two points of the arc, and two midlines are respectively connected by any two points of the arc. The principle that the intersection point must be the center of the circle is made, for this reason it includes a pair of crosshairs 1,2 made of transparent material, the longitudinal scales of the pair of crosshairs 1,2 are located at the right and left of the longitudinal rulers 11,21 respectively The side and horizontal scales are all positioned at the lower side of the cross ruler 12,22, and the vertical and horizontal scales of the pair of cross rulers 1,2 are marked up and down, left and right respectively as the starting point at the intersection of their scales, as shown in Figure 1-3. In the measurement, first place the cross ruler 1 whose vertical scale is on the right side of the longitudinal ruler on the steel bar 3 to be measured, and make the scales on both sides of the horizontal ruler 12 equal to the intersection of the arc, as shown in Figure 4, that is, the horizontal The two distances D11 and D12 between the scale and the arc are equal; then place another cross ruler 2 with the vertical scale on the left side of the longitudinal direction on the steel bar 3 to be measured, and also make the scales on both sides of the horizontal ruler and the arc intersect equal , as shown in Figure 5, even if its horizontal scale is equal to the two distances D21 and D22 intersected by the arc, the intersection point of the vertical scales of the two longitudinal scales is the center O of the arc of the steel bar, so that the radius of the arc of the bar can be read R, at this time R=D3+D4, where D3 is the shortest distance from the starting point of the longitudinal scale to the inner diameter of the arc, and D4 is the distance from the starting point of the vertical scale to the center O of the arc. The present invention utilizes the intersection of the vertical ruler scales of a pair of cross rulers to obtain the center of the arc of the steel bar. Once the center of the circle is determined, it is easy to read the inner diameter of the arc. Therefore, the present invention has a simple structure and a simple and accurate measuring method. .

The present invention accurately places the position of the ruler and reads the scale through the transparent cross ruler. Normally, the scale length of the longitudinal ruler below the horizontal ruler is 4~8 times of the scale length above the horizontal ruler. The scale length of the longitudinal ruler is 5CM.

Claims (2)

1. a bending reinforcing bar inner arc radius measurement is to chi, it is characterized in that: include a pair of Cross ruler of making by transparent material (1), (2), this vertical scale to Cross ruler (1), (2) lays respectively at linear foot (11), the right side of (21), left side, laterally scale all is positioned at crossfoot (12), (22) downside, the vertical, horizontal scale of each Cross ruler (1), (2) the intersection of their scales be starting point respectively toward about, about carve minute.

2. bending reinforcing bar inner arc radius measurement according to claim 1 is characterized in that chi: described linear foot is to be positioned at 4 ~ 8 times of scale length above the crossfoot being positioned at scale length below the crossfoot.

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