BENCHMARK AND METHOD OF ITS INSTALLATION Russian patent published in 2010 - IPC G01C15/04 

FIELD: mining.

SUBSTANCE: method for installation of benchmark consists in assembly of metal benchmark core in previously formed soil cavity by structural elements, anchor, anti-heaving accessories of core, cavity filler. Cavity is arranged in the form of cavity, where anchor is freely lowered and deformed. Core that has been previously rigidly fixed along its surface with plastic race is installed by means of driving into anchor, besides race external surface is lubricated with non-freezing material below seasonal soil freezing level (SSFL), and core is equipped with metal cone-shaped tip at its lower end. Tubular shell, lower end of which does not reach anchor, but with length exceeding SSFL, is placed onto core with race, with possibility of sliding and provision of free space with race. External surface of shell is lubricated by non-freezing material. Anchor is filled with binding compound, and remaining cavity of well is filled with local soil material. Benchmark comprises a metal core with cone-shaped tip and anchor at the end, anti-heaving accessories with lubricating material. Core is rigidly fixed along its surface with plastic race, external surface of which is lubricated with non-freezing material. Plastic shell, length of which exceeds SSFL, is placed on core with race with the possibility of sliding and provision of free space with race. External surface of plastic shell is lubricated by non-freezing material and is wrapped by plastic film. Anchor is arranged in the form of metal nozzle with diametre that is less than well diametre. In nozzle there are longitudinal slots on part of its length, forming strips, besides part of strips is alternately bent into inner space of nozzle until they lock with each other, upper ends of other part of strips are bent towards walls of well. Lower part of well with anchor is filled with fixing compound, for instance concrete, and remaining free space of well is filled with local soil.

EFFECT: expansion of benchmarks application area under conditions of badlands and increased accuracy of measurements.

2 cl, 2 dwg