Dial protractor and using method thereof

Abstract

The invention discloses a dial protractor and a using method thereof. The dial protractor comprises a dial disc and a swing needle which is fixed on the dial disc. The dial protractor is characterized in that the dial disc comprises an inner dial disc and an outer dial disc; the center of the inner dial disc is provided with a central rotary shaft which is connected with the swing needle; the whole swing needle is of an ellipse shape; the upper part of the swing needle is of a hollow closed structure thinner in upper part and wider in lower part; the swing needle is fixed at the peak of the closed structure thinner in upper part and wider in lower part; a heavy hammer is fixed at the bottom of the swing needle; the inner dial disc is fixed at the center of the outer dial disc, and is of a flat top conical shape; and a transition structure with gradient is formed between the inner dial disc and the outer dial disc. The using method comprises the following steps: (1) placing a cushion ruler on a plane to be measured; (2) sticking one side of the dial protractor and the surface of the cushion ruler tightly according to the direction of the measured angle; and (3) taking the included angle between the zero graduation line of the inner dial disc and the indicator direction as the angle need to be measured when the swing needle is static. The dial protractor and the using method provided by the invention can be used for measuring any gradient angle accurately and efficiently in the construction process and acceptance checks and are used for checking measured angles of the horizontal and vertical planes.

Description

technical field [0001] The invention relates to a measuring angle device for building construction, in particular to a dial-type measuring angle ruler and a using method thereof. Background technique [0002] At present, all kinds of steel rulers for measuring length have been widely used in construction projects. However, instruments for measuring various slopes, such as excavation slopes, staircase slopes, roofs, and open ditch slopes, are relatively rare. Use the method of hanging heavy objects and using the heavy vertical line to measure the horizontal length and the corresponding height difference, and then check the slope through the trigonometric function relationship; while the workers check the verticality of the wall or column during the construction process, it is similar to the method of visual inspection using a hanging hammer Parallelism between the vertical line and the wall. However, due to adverse effects such as unsatisfactory site flatness and wind distur...

AI Technical Summary

Problems solved by technology

However, due to adverse effects such as unsatisfactory site flatness and wind disturbance, the measurement results are often time-consuming and have large errors

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