SU62586A1 - Adaptation to theodolite for optical centering relative to the frame - Google Patents

Description

For centering theodolite relative to the frame, either a plumb line or an optical plunger in the form of a broken pipe, passing through the hollow axis of rotation of the theodolite pipe, is usually used.

The accuracy of the plumbing centering is low in general, it decreases even more with the slightest wind, especially if there are no special wind guards.

Existing optical plummet allow installation of the tool over the frame with higher accuracy, but their device is difficult.

The described theodolite adaptation for optical centering solves the problem of replacing the plumb on existing theodolites with an accuracy of vernier 1.30 and 10 much easier, while providing greater centering accuracy.

According to the invention, the optic tube or diopter is located at a constant angle to the vertical axis of rotation of the theodolite movably on a ruler attached to the theodolite alidade. This makes it possible to simultaneously determine the eccentricity of the tool installation relative to the reference point and the tool height.

FIG. 1 shows a device, side view; in fig. 2-scheme of work with him; in fig. 3-line device, top view.

A radial-directed ruler / is attached to the theodolite alidade, the top of which is perpendicular to the vertical axis .4.4 of the theodolite. The ruler has divisions that go in the direction from the center of the theodolite. On this ruler, tube 2 with diopters is movably mounted so that the sighting axis of the tube, defined by diopters, faces the projection of the center of the instrument at ground level. Diopters can be replaced with an optical tube, which further clarifies the device. With the vertical axis of the theodolite, the tube sighting axis of the tube is a certain constant angle no. 62586-2, which does not change when the tube moves along a ruler, since the top of the ruler is linear.

Work with the device is as follows.

After the theodolite is installed by eye over the ground point O and the alidade level is brought to the middle of the bubble, the diopter of pipe 2 is directed to the point O and B is fixed to the ruler. The tool then rotates around the vertical axis of the AA by 180 °. If point O is again on the centering tube's sighting axis, the tool is centered. If not, then notice the counting on the ruler divisions when first pointing to point a and, after turning 180 °, point again to point Q, respectively by shifting the diopter lineup and make

on the divisions of the line, the second countdown of the item. The half-count of readings / lo

gives the position of the diopters on the ruler of FIG. 2, in which the tool will be precisely centered.

Countdown can be used to determine the height of the instrument /. With a constant angle of inclination of the axis, the tubes with diopters equal to a height / instrument are: f m-Ctga + /

But at a Cons, Ctg and Cons has / place + i The value of i, is equal to the distance from the top of the ruler with diopters to the horizontal axis of the BB tool rotation, also the value is constant. This value can be measured and added to the value of / rzo / C. The value of K is given by design and can be easily experienced by experience. Even easier, the value of r is taken into account by the constant addition of the readings along the ruler, the transfer of the conditional zero of its readings not to the center of rotation of the tool, but by taking into it the value:

In this case, the counting on the ruler multiplied by A, will immediately give the height L of the tool.

To simplify the calculation of the value of /, it is possible by selecting the angle a to give tg a simple ratios (for example, 0.1) or, accordingly, select the division values on the ruler so that a single division corresponds to 1 cm of the tool height.

Since the divisions on the ruler will be at least 1 mm, the accuracy of determining the height of the tool will be more accurate than the usual method of measurement with a rod or tape measure.

Subject invention

An adaptation to a theodolite for optical centering relative to a frame using a telescope or diopter directed at the center of the rener, characterized in that the said optic pipe or diopter is arranged at a constant angle to the vertical axis of rotation of the theodolite movably to the ruler, with theodolite attached to the alidide , in order to determine simultaneously with the eccentricity value of the installation of the instrument relative to the frame or its centering, also the height of installation of the instrument.

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