Crack opening two-direction deformation monitoring structure and measurement method

Abstract

The invention discloses a crack opening two-direction deformation monitoring structure and a measurement method. An upper vertical fixing rod and a lower vertical fixing rod are provided with vertical level bubbles respectively and are buried into the two sides of a monitored crack respectively. A horizontal cross rod is provided with horizontal level bubbles, is connected with the upper vertical fixing rod through a threaded rod and is fixedly connected with an oblique fixing rod. The two ends of a distance measurement sensor are connected with the oblique fixing rod and the lower vertical fixing rod respectively, and the two ends of an angle measurement sensor are connected with the oblique fixing rod and the distance measurement sensor respectively. The crack opening two-direction deformation monitoring structure and the measurement method have the advantages that oblique crack deformation can be accurately divided into vertical deformation and cross deformation, field assembly can be carried out, and the measuring ranges and precision of the distance measurement sensor and the angle measurement sensor can be adjusted according to the position and opening width of the crack.

Description

technical field [0001] The invention relates to a monitoring structure, in particular to a crack opening two-way deformation monitoring structure and a measuring method, which are suitable for crack monitoring items in slopes, embankments, foundation pits and tunnel engineering. Background technique [0002] Cracks of various shapes often appear in the construction and operation of high slope geotechnical engineering, foundation pits, tunnels and other projects in my country. In engineering, the opening shape and depth of cracks are often used as important indicators for evaluating the safety status of a project. Since the opening shape and depth of cracks will change over time, in order to accurately reveal the changes of cracks, some projects often need to monitor the development and changes of cracks. [0003] At present, the instruments for crack monitoring in engineering mainly include small steel rulers, vernier calipers, wedge-shaped feeler gauges, vernier feeler gau...

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Problems solved by technology

[0006] like figure 2 As shown, there is a three-way crack displacement monitoring device on the market, which includes three mutually perpendicular displacement sensors (4) to observe the deformation of the crack in three directions, but because the device lacks the corresponding direction control equipment , it is difficult to accurately convert the measured deformation in three directions into the vertical and lateral deformation of the fracture; at the same time, it is difficult to control the deformation in the three directions observed by the equipment on the same fracture observation section (often corresponding to different adjacent observation points) , affecting the correctness of later theoretical analysis; and the equipment installation is more restricted by the site conditions, the assembly is difficult, which is not conducive to on-site maintenance

[0007] To sum up, although there are some instruments and methods that can be used for civil engineering crack monitoring in engineering, various monitoring methods have achieved good crack monitoring results in a suitable engineering background, but there are still some deficiencies, mainly reflected in : Small steel rulers, vernier calipers, wedge-shaped feeler gauges, vernier feeler gauges, and convergent gauges have low monitoring data accuracy, and it is difficult to reflect the two-way deformation of cracks; crack gauges or surface crack gauges are suitable for engineering structure monitoring with relatively flat surfaces , it is also difficult to reflect the two-way deformation of the monitored cracks; although the GPS monitoring of ground fissures can monitor the two-way deformation of the cracks, the cost of structural monitoring equipment is high, the maintenance is difficult, and the accuracy is low

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