FIELD: construction, particularly dredgers or soil-shifting machines for horizontal holes digging-out, namely for delivery main crossing construction.
SUBSTANCE: method involves alternately drawing two protective cases in previously drilled and reamed hole with the use of drilling rig; covering highly-abrasive rock at hole inlet and outlet with the cases by means of stop collars, safety-guiding collars and special removable plugs.
EFFECT: prevention of isolation pipeline coating damage during pipeline drawing through hole having pebble or other hard material in surrounding rock at hole inlet and outlet.
3 dwg
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