A ground settlement monitoring method based on difference principle
A foundation settlement and principle technology, applied in measurement devices, mapping and navigation, height/level measurement, etc., can solve the problems affecting the popularization of settlement measurement methods, inability to feed back data in real time, and high equipment costs, and achieve scientific monitoring results and system reliability. , the effect of convenient construction
Active Publication Date: 2020-11-06
上海防灾救灾研究所
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Problems solved by technology
At present, the industry mainly uses levels or total stations to establish elevation control networks to measure settlements, and has been widely used in various projects; however, this method has the problems of low work efficiency, high equipment cost, and inability to feed back data in real time, which affects the project. Popularization of settlement measurement methods
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[0040] The ground settlement monitoring method based on the difference principle of the present invention includes a laser range finder, a beam splitter and a target plate; please refer to figure 1 , the laser range finder 1 and the spectroscope 2 are fixed in a sealed box 4, and the sealed box 4 is fixed near the measuring point of foundation settlement monitoring. The target plate 3 has the characteristics of automatically eliminating the influence of its own corner, and is always kept level. The target plate 3 includes an antisymmetric cross plate, and the cross plate is formed by cross-connecting two flat plates at the midpoint to form an X shape. The two flat plates The included angle with the horizontal line is θ, θ=45°, or θ=60°, or θ is any angle less than 90°.
[0041] The laser rangefinder 1 emits a vertical single laser beam, which is colored light; the laser beam passes through the beam splitter 2 at an incident angle of 45°, and is decomposed into horizontal and m...
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The invention discloses a monitoring method for foundation settlement based on a difference principle. A laser distance meter, a beam splitter mirror and a target plate are adopted in the method. Themethod comprises the following steps: emitting a single beam of light by the laser distance meter; splitting the single beam of light into upper parallel light and lower parallel light which are parallel to each other by the beam splitter mirror; forming a light spot on the target plate; respectively sensing and measuring the optical path of the parallel light by the laser distance meter. When foundation settlement happens, the position of the light spot on the target plate and the optical path of the parallel light are changed and the settlement volume delta of the foundation is as follows: delta=(s2'-s1'-s0)tan theta / 2 and s0=s2-s1, wherein s1 is the initial optical path of the upper parallel light, s2 is the initial optical path of the lower parallel light, s0 is the initial optical path difference, s1' is the optical path of the upper parallel light after the settlement, s2' is the optical path of the lower parallel light after the settlement and theta is the included angle of thetarget plate and the horizontal line. The monitoring method disclosed by the invention has the advantages of construction convenience, low cost, less energy consumption, high monitoring precision, running stability and reliability, and the like, and is especially suitable for the long-term monitoring for the deformation of long-distance shield tunnel and the large-area foundation scouring of large-scale foundation pit and wind power plant.
Description
technical field [0001] The invention relates to engineering structure behavior detection and monitoring, in particular to a foundation settlement monitoring method based on a differential principle, which belongs to the technical field of civil engineering. Background technique [0002] Settlement monitoring is an important means to ensure construction safety, engineering quality and operation safety in highways, railways, tunnels, high-rise buildings, foundation pits and wind farms. Long-term continuous settlement monitoring and analysis of monitoring results can timely discover and ascertain the causes of differential settlement. [0003] Subsidence monitoring requires the use of high-precision instruments, longer monitoring time, stable observation points and fixed equipment. At present, the industry mainly uses levels or total stations to establish elevation control networks to measure settlements, and has been widely used in various projects; however, this method has p...
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IPC IPC(8): G01C5/00
Inventor 赵鸣唐冬玥
Owner 上海防灾救灾研究所