RU93012856A

RU93012856A - METHOD FOR DETERMINING ROLL

Info

Publication number: RU93012856A
Application number: RU93012856/10A
Authority: RU
Inventors: А.В. Никитин
Original assignee: Хабаровский государственный технический университет
Filing date: 1993-03-09
Publication date: 1995-05-27

Claims

The method of determining the roll refers to the geodetic measurements and can be used in determining the roll of cylindrical shells. To increase the productivity of work in determining the roll of cylindrical shells, the roll is determined from the difference in vertical angles between points and measured by a theodolite installed at the center network point, while calculating the design difference between the vertical angles of standard points. To determine the roll, eight standard points are used that are located symmetrically relative to each other, with one of the pairs of points (the first and the fifth) coinciding with the structure axis. The theodolite is installed at point A located on the building axis (axis X), vertical angles are measured at standard marking points t. 1 - v. 8 and their differences are calculated in pairs at 1 - 5, 2 - 4, 8 - 6, 3 - 7, 2 - 8, 4 - 6. Then the differences of the vertical angles are compared with their design values, while the angular values of the components of the roll are converted to exceedances. The components of the roll determine the direction and size of the roll in altitude, which, if necessary, translate into a linear or angular expression. The design difference of vertical angles between pairs of points 2 - 8, 3 - 7, 4 - 6 is equal to zero due to the fact that the distances to each pair of points are equal. Vertical angles are measured and their actual difference is calculated in seconds, while determining the height expression of the roll component ΔK along the Y axis by the formula:

where l is the horizontal distance of lines from the reference point to the standard points; Dn is the difference of vertical angles; r - 206265 ". The value of the roll component along the X axis is found from the difference of vertical angles into pairs of standard points 1-5, 2-4, 8-6. The actual difference of vertical angles is compared with the design one, which is determined in advance by the formula, for example:
Dn = ν ₁ -ν ₅ ,
where ν ₁ and ν ₅ are the values of the vertical angles on v.1 and v.5. After setting the design value ν _{1, the} design value ν _{5 is} calculated by the formula:

where l ₁ , l ₅ are horizontal lines of lines from reference point A to points 1 and 5.