Measurement control method for field installation of steel tube lattice pier

Abstract

The invention discloses a measurement control method for field installation of a steel tube lattice pier. The steel tube lattice pier is composed of four upright steel tubes, a transverse-connecting truss is arranged along the height of the pier, and a connecting ventral tube is arranged between the upright steel tubes; the steel tube lattice pier is conveyed to the pier site to carry out field installation in the form of steel tube section units processed in advance and the transverse-connecting truss; the steel tube section unit is composed of two longitudinal A-shaped frame steel tubes anda cross brace through connection; and in the process of installation, the steel tube section units are positioned by using a measurement control method which is based on a 'three-dimensional coordinate control method' and supplemented by a 'double-axis control method'. By using the method disclosed by the invention, the axis deflection of the pier body caused by environment factors, manual operations and improper constructions can be effectively eliminated, the setting-out precision and the operating efficiency are high, the needs of installation of lattice pier studs and cross braces are satisfied, and the surveying personnel and instruments are not hurt by falling objects, therefore, the method has practical applicability.

Description

technical field [0001] The invention relates to an installation measurement control method of construction engineering, in particular to a steel pipe lattice pier installation measurement control method on site. Background technique [0002] At present, the "zenith method" is generally used in the field installation of steel pipe lattice piers of relatively high bridges in China. When constructing the bottom concrete floor, the position of the control point is accurately determined. Set on the ground floor, use optical centering equipment to align the optical center point of the theodolite with the center of the control pile, and then aim the theodolite at the zenith (construction layer). A movable glass cross is provided at the reserved hole on the construction layer. Adjust the glass plate to the cross center point of the vertical theodolite, which is the control point set during construction. After all the control points are projected, each position line is determined ac...

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Problems solved by technology

The current method is greatly affected by various environmental factors and human operations, and the accuracy and efficiency

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