Theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method

Abstract

The invention relates to a theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method. The theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method comprises the following steps of 1, preparing a contrast sample through the processes of cutting off parts having length of L from steel wire ropes having different diameters according to a determined steel wire rope diameter scope and carrying out steel wire rope nondestructive test contrast sample preparation, 2, selecting steel wire ropes which have the same structure and length of 2 meters, cutting the selected steel wire ropes at their middle parts for same defect manufacture, and carrying out breaking force experiments respectively on the cut steel wire ropes, 3, carrying out magnetization, calibration and detection of the steel wire rope nondestructive test contrast sample obtained by the step 1 by a steel wire rope electromagnetic tester to obtain different defect detection values, and preparing a contrast sample parameter parallel table corresponding to breaking force values, and 4, determining steel wire rope detection data according to on-site detection data and the contrast sample parameter parallel table, calculating breaking force values of the detected steel wire ropes according to the steel wire rope detection data, and carrying out detection conclusion determination. The theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method is simple, can produce effects fast, and can guarantee safe and normal use of a steel wire rope according to accurate contrast of a steel wire rope nondestructive test contrast sample and a detection result.

Description

Technical field [0001] The invention relates to the verticality measurement of a pillar of a large spherical tank, in particular to a method for accurately measuring the verticality of a pillar of a large spherical tank. Background technique [0002] According to the provisions of GB12337 "Steel Spherical Storage Tanks", during the on-site installation and regular inspection of large spherical tanks, the verticality of the pillars of the spherical tank needs to be measured. The method usually used is the manual plumb hanging method. The verticality deviation standard Δ=|a2-a1| is calculated by the distance between the top of the line and the pillar distance a1 and the bottom of the plumb line and the pillar distance a2. Generally, when the pillar height H≤8m, Δ≤10mm; when the pillar height H>8m , Δ≤15mm. [0003] When using the hanging wire method for measurement, scaffolding (usually more than 10 meters in height) is required. During the installation and inspection of the sph...

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Problems solved by technology

However, the following special situations will also be encountered. First, when the erected scaffolding blocks the measurement position and needs to be removed and is limited by the construction period. Second, when the wind is strong, the suspension line will have a large deviation under the action of the wind, resulting in severe seriousness of the original qualified data. Third, when the verticality of the pillars that are seriously out of tolerance needs to be monitored online during the operation of the spherical tank, it is obviously impractical to use the hanging wire method

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