Measuring reflection piece support

Abstract

The invention relates to the field of underground engineering construction, in particular to the field of non-contact monitoring and measuring of tunnels and discloses a measuring reflection piece support. The measuring reflection piece support comprises an anchored section and a movable section. The anchored section comprises an anchored steel bar and a sleeve; the movable section comprises a clamping box and a U-shaped frame; the clamping box comprises a box bottom, box walls and a box top; the box bottom of the clamping box is connected with the sleeve; a central hole in the box top of theclamping box is connected with the U-shaped frame through a radial rotating bolt; an axial rotating bolt is mounted on supporting legs on the two sides of the U-shaped frame; and a reflection piece pasting plate is fixed to the middle of the axial rotating bolt. The measuring reflection piece support has the beneficial effects that the support is divided into the two parts of the anchored sectionand the movable section; the part, located at the movable section, of the support can be detached and preserved after observation of each time, so that damage and disturbance to an observation mark inthe construction process are avoided, pollution of dust, spraying slurry and the like to the observation mark is avoided, and the observation condition is improved greatly; and misjudgment to the stability of surrounding rock is avoided, and data measuring continuity is guaranteed.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to the field of non-contact monitoring and measurement of tunnels. Background technique [0002] Monitoring and measurement is a key process of tunnel construction and an important part of on-site construction organization. It is closely related to the surrounding environment of the tunnel and construction safety, quality and progress. Tunnel monitoring and measurement methods are mainly divided into contact measurement method and non-contact measurement method. Due to the great limitations of the contact measurement method, it can no longer meet the requirements of modern construction. At present, the tunnel construction generally adopts the non-contact measurement method for monitoring Measure. [0003] At present, the non-contact measurement method mostly adopts the pre-embedded support in the surrounding rock of the tunnel and the initial support, pastes the ...

AI Technical Summary

Problems solved by technology

Therefore, there are many deficiencies in the measurement by this method, such as: the reflector is exposed in the construction environment, it is easily polluted by dust and spray grout, and the reflection condition is poor, which affects the collection of observation data; the exposed part of the bracket is placed on the tunnel wall, which is easy to be blasted Flying stones and construction machinery are disturbed or damaged. If they are slightly disturbed, the surveyors will mistakenly believe that the disturbed displacement is the deformation of the measuring point, and misjudge the stability of the surrounding rock; if they are destroyed, the measurement data will be discontinuous, and Observation marks need to be re-buried; construction interference in the tunnel is large, the site is narrow, and with the progress of construction, the position and elevation of the measuring station will change, which cannot guarantee the best observation angle of the measuring instrument and the reflector, and the measurement accuracy and reliability The reliability cannot be guaranteed; the bracket cannot be reused, and the cost of observation materials will increase

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