DT-2 subsidence measuring instrument

Subsidence measuring instrument The subsidence measuring instrument is a detection device that can monitor the movement of the roof rock layer. It can respectively display the detachment status of the roof rock layer within the length range of the anchor rod and outside the same range of the anchor rod.
.Instrument structure and composition
.Instrument structure
The subsidence measuring instrument is mainly composed of base point anchor head, measuring rope, sleeve, inner measuring cylinder and outer measuring cylinder. . .Monitoring Principle
The deep base point anchor head should be fixed in the stable rock formation at the deep part of the drill hole, and the shallow base point should be fixed at the drill hole (the end of the drill pipe). When there is a separation layer within the anchoring range of the anchor rod, the top plate (casing) moves downward along the outer measuring cylinder, and the amount of movement is indicated by the measuring cylinder scale. When the top plate of the anchorage range is delaminated, the relative position of the outer measuring cylinder and the top plate does not change, but slides downward along the inner measuring cylinder, indicating that there is delamination on the top plate, and the amount of delamination is indicated by the scale of the inner measuring cylinder. When there are detachment layers inside and outside the anchoring range of the anchor rod, the inner and outer measuring cylinders have detachment layer displays respectively, and the sum of the displayed values is the total detachment layer value.
.Instrument installation
.First install the deep base point anchor head, use the installation rod to send the anchor head to the designed position, and tighten the measuring rope when sending it in.
.Send the shallow anchor head to the installation position.
.3 Install the casing, and connect the bottom end of the casing to the waterproof sign. The bottom edge of the waterproof sign is about 3 inches away from the top plate. Then connect the deep anchor head measuring rope to the inner measuring cylinder, and the shallow anchor head measuring rope to the outer measuring tube. Measuring tube connection.
.The zero point of the outer measuring cylinder is aligned with the bottom edge of the casing, and the zero point of the inner measuring cylinder is aligned with the bottom edge of the outer measuring cylinder.
3. Observation records
Observation records of tunnel roof detachment
Application of subsidence measuring instruments in various mining areas
Comprehensive roof detachment of various types of anchor network tunnels Observation, it is generally recognized that roof separation layer observation plays a certain guiding and warning role in the support and reform of anchor network tunnels. Based on the analysis of the data observed by the roof separation layer instrument, different geological conditions, lithological changes, etc. were obtained. It was concluded that the maximum amount of separation layer within the anchor network range of the anchor network tunnel should be controlled at -, otherwise other effective measures should be taken in time. Support measures to prevent roof accidents and ensure safe production.



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