A spatial geometric positioning method for the wall of a large cooling tower with ribs

Abstract

The invention relates to a space geometry positioning method for a large cooling tower barrel wall with fins. The space geometry positioning method comprises the steps that (1) the center point of a cooling tower, the control point of a guide rail and the center points of the fins are determined; (2) space coordinates of the control point of the guide rail are controlled; (3) the radius of the control point of the guide rail is controlled; (4) fine adjustment of vertical positions of the fins is carried out through a horizontal ruler or a plumb bob; (5) chord length measurement control is carried out to control the deviation value between the actual chord length between the center points of adjacent fins and the designed chord length to be smaller than or equal to 3 mm. In this way, implementation of space geometry positioning of the cooling tower barrel wall and the fins is guaranteed, it is completely guaranteed that construction deviation of the barrel wall and the fins is smaller than or equal to 3 mm, and the appearance curve of a hyperbolic cooling tower is straight and smooth.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a spatial geometric positioning method for a tube wall of a large-scale cooling tower with ribs. Background technique [0002] The cooling tower is generally a hyperbolic tower composed of circular tube walls with a height of about 1.5m each. Each section of the tube wall is assembled into an approximately circular shape by the same large formwork inside and outside, and then poured concrete to form an approximately circular tube. The joints of each large template are connected and fixed by inner and outer guide rails and inner and outer compensators. At present, the construction of the wall of the cooling tower mainly adopts the "Harmon Ⅲ" type electric climbing formwork construction. The complete set of construction has realized mechanization, and the guide rail is easier to control. deviation. The geometric dimension control of the wall of a large cooling to...

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Problems solved by technology

[0003] In order to ensure the accuracy of the geometric dimensions of the cylinder wall, the traditional cross method is generally used to measure the geometric dimensions of the cooling tower cylinder wall, which mainly depends on the measurement of the measuring tape. The accuracy is poor, and it is easily affected by human factors, such as tension, the tightness of the tape measure, etc., which directly affect the accuracy of construction measurement

And for large and high cooling towers, the measurement error is relatively large, which seriously affects the use effect and service life of the cooling tower

In addition, optical plummets are also used for measurement. First, the number of rays is determined on the bottom plate of the pool according to the number of internal climbing frames, and two reference size points are set on each ray. After the concrete is poured, the tube wall is measured with an optical instrument. Radius, that is, project the vertical collimator on the measuring point onto the ruler with scale to calculate the actual horizontal distance, then calculate the radius error value of the cylinder wall, and finally calculate the corrected deviation according to the radius error value, so that each The horizontal radius of a section is equal, so as to prevent the cross section of the section from being wavy, but the accuracy of the measurement method is not enough, and the radius and verticality of the cylinder wall have large deviations, which will have an impact on the use effect and service life of the cooling tower

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