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A total station reflector sheet steel beam deflection measurement method

A deflection measurement and total station technology, applied to measurement devices, instruments, etc., can solve the problems of difficulty in setting up the operation platform, complicated installation and disassembly, etc., and achieve simple and fast measurement, convenient layout and disassembly, and accurate and reliable observation data. Effect

Active Publication Date: 2022-04-22
NO 4 ENG COMPANY LTD OF CCCC FIRST HARBOR ENG COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for measuring the deflection of a reflector-type steel beam with a total station, which solves the problems of complicated installation and dismantling of traditional deflection measuring instruments and difficulty in setting up an operating platform. The measuring method is convenient, fast and accurate.

Method used

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  • A total station reflector sheet steel beam deflection measurement method
  • A total station reflector sheet steel beam deflection measurement method
  • A total station reflector sheet steel beam deflection measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] combine Figure 1 to Figure 3 A method for measuring the deflection of a total station reflector type steel beam comprises the following steps:

[0051] Step Ⅰ, after the ground assembly of the steel beam is completed, the axis or axis offset line is popped up on the surface of the steel beam, and reflectors are arranged at both ends and mid-span of the steel beam;

[0052] Step Ⅱ, lay out at least two known elevation points on the bottom plate under the steel beam, and regularly conduct level closed joint measurement of the known elevation points to ensure that the elevation values ​​of the known points are accurate and reliable;

[0053] Step Ⅲ, use the triangular elevation observation principle of the total station, set up the instrument at any position on the base plate according to the construction environment, directly measure the elevation of one of the known points, calculate the height of the instrument according to the elevation displayed by the total station,...

Embodiment 2

[0066] combine Figure 1 to Figure 3 , the vertical deflection value f of any monitoring point E in step Ⅴ 1 The calculation method is as follows:

[0067] According to the similarity principle of triangle proportion:

[0068]

[0069] Organized:

[0070] (H' B -H' A )×L BE =H' B ×(L BE +L EA )-(f 1 +H' E )×(L BE +L EA )

[0071]

[0072] final:

[0073]

[0074] The deflection change value is positive for downward deflection, and negative for upward arching;

[0075] The E point is at any position on the axis. If the E point is at the center of the axis, the obtained deflection value is the mid-span deflection value. If the E point is at 1 / 4 of the axis, the obtained deflection value is at 1 / 4 of the axis. deflection value. The equipment for ejecting the axis or axis offset line on the surface of the steel beam uses an ink cartridge, and the ejection axis or axis offset line is an ink line; the reflective sheet is a self-adhesive reflective sheet, and...

Embodiment 3

[0077] combine Figure 1 to Figure 3 , a method for measuring the deflection of a steel beam with a total station reflector, including deriving the deflection calculation formula in the code using triangular geometric similarity, laying a reflector 2 on the axis 1 of the steel beam, and knowing the control point 6 on the ground Set up the prism 5 on the top, set up the tripod 4 and the total station 3 at any position on the ground, calculate the height of the instrument by measuring the height of the known control point 6, and reset the station after adjusting the height of the instrument. After the total station switches to the reflector observation mode , the prism height is set to 0, and then the relative coordinates and elevation of the reflection sheet 2 are directly measured.

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Abstract

The invention discloses a method for measuring the deflection of a total station reflector-type steel beam, which specifically includes the following steps: step I, popping up an axis or axis offset line on the surface of the steel beam, and laying a reflector on the steel beam; Arrange at least two known elevation points on the bottom plate below the beam and conduct level closed joint measurement; step III, set up the instrument at any position on the bottom plate, and measure the elevation of one of the known points; step IV, switch the total station to the reflection sheet observation mode , aim at the reflector at the monitoring point to measure the relative coordinates and elevation; step V, derive the deflection value formula: step VI, conduct two observations on the left side and the right side of each monitoring point, and take the average value as a round observation value; step VII, taking the average value of independent observations as this observation result; Step VIII, monitoring the steel beams standing, lifting, placing, unloading and roof concrete construction processes, and analyzing the force through deflection changes. The steel beam deflection measuring method is convenient, quick and accurate.

Description

technical field [0001] The invention relates to the field of construction engineering measurement, in particular to a method for measuring the deflection of a total station reflector type steel beam. Background technique [0002] Most of the traditional deflection measurement is directly measured by a level or deflection measuring instrument (diameter, displacement gauge). The advantage of this method is that it can perform multi-point detection, directly obtain the deflection value of each measuring point, and the measurement result is stable and reliable. [0003] However, the direct measurement method has many shortcomings: [0004] 1. The deflection measuring instrument is a special instrument, and general construction enterprises need additional configuration. [0005] 2. The direct measurement method needs to set up a special operation platform at each monitoring point. When the height of the monitoring target is high, the span is large or there is cross construction,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 张钧祥余良勇马星宇周彬李孟杰
Owner NO 4 ENG COMPANY LTD OF CCCC FIRST HARBOR ENG COMPANY
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