The compressive stress dispersive anchor composed of two or more bearing plates. The plates are uniformly distributed in the underreamed anchoring section of the anchor rod. The grout body is mounted on the drilling rod. The bearing plates are evenly placed at the anchoring section of the underreamed anchor by jet grouting. The plates have stress type anchor that behaves effectively as the dispersive underreamed anchoring section compressive stress under the effect of tensile load. Read More >>
The jet grouting process mainly adopts an improvised high-pressure rotary spray method to form an anchoring section of the rotary spray underreamed anchor on the bottom plate of the anchor. Besides, the bearing plates are distributed in the anchoring section of the underreamed anchor to realize the dispersive of the internal stress of the anchor. As such, the pull-out force and its stability are strengthened which enable the integration process of drilling, anchoring and grouting. Furthermore, the work efficiency can be improved and the progress can be accelerated greatly. Read More >>
The anchor fails to recover normally due to the slurry leakage, unstable long-distance transmission and rusting of the unlocking device (complex underground environment, corrosion, etc.). As it is unable to predict the recoverable of the anchor through measurement, it appears to be more passive when taking remedial measures such as strong pulling and coring operation with casing. Read More >>
a. Factory certificate in raw material, report on sample inspection of raw material, report on sample inspection of anchor recovery device.
b. Project construction record of anchor, anchor recovery record.
c. Test report on the carrying capacity of anchor.
d. Record for inspection and acceptance of concealed works. Read More >>