Bimetal Benchmark

In order to provide a reliable source base for the night networks on large industrial and infrastructure objects, they apply deep-depth monitors.  Most often as deep-depth monitors use palm or metal monitors.  They are laid in hard rock, which provides reliable storage of high-altitude network level for long time.  They are placed as close as possible to the equipment (25-50 m), or directly in the shop (Baran, 2012).

The simplest structure of deep rapper – metal or reinforced concrete fuel, clogged at a depth of 20-50 m to the level of root pored.  Two pipes are used for the metal rheer: The basic one is made of steel;  and auxiliary – made of duralumina and placed in the main pipe.  In the base of the river two pipes are fixed to concrete anchor.  Inside the main pipe of the river is additionally equipped with a perforated pipe.  This allows you to lower the thermometer and measure the temperature of the monitor rod in different depths.  At the top of the benchmark you can set the linear movement indicator or mechanical micrometer (Baran, 2012). When the temperature is changed by Δt=t-t0 (t0 , t is the temperature at the first cycle of the neling and the current cycle), the height of the repper tubes is changed by the value entered as an adjustment.

The metal repertoire has different constructions.  The so-known compensating metal benchmark, which consists of three pipes of different diameter: Two pipes are made of steel, the third one is made of duralumina.  The principle of this bi-metal rapper is based on compensation of temperature expansion of two steel pipes with coefficient of linear expansion 12.5·106‑ and one duralumina pipe with twice the coefficient of linear expansion 22.6·10-6 1/°С (Baran, 2012).

This article offers an overview and principle of the author’s bietal pen, work with which does not require additional calculations and calculations of amendments.