Modeling of the heat balance of elements of a drill hydraulic remover for inject cementation of soils during operation

Abstract

The article deals the issues of constructing by according to previously developed methods of the model that describes the heat balance in the unit “hydraulic puller-drill shaft”, which is used in jet-grouting devices. Two main groups of materials used in similar structural units for the manufacture of sealing elements, which include elastomers and thermoplastics, are analyzed. The requirements are described and the operating conditions of these materials are indicated. Separately, attention is focused on the range of operating temperatures of materials of sealing elements for hydraulic pullers. The algorithm used for the computational experiment with the indication used in the calculation, the software package that allows to solve applied problems of strength, heat transfer, etc. A solid model of a section of a drill shaft with a meshing of finite elements is presented. It is shown that the distribution of the thermal field in the elements of the hydraulic cutter of the drill head, obtained as a result of the finite element calculation, that arises during operation and factors that significantly affect the temperature distribution are identified. The assumption is substantiated that the materials currently used in hydraulic pullers for jet cementation of soils do not withstand the heat load that occurs in such ultra-high pressure devices during their operation.

Keywords

• jet-grouting
• drilling bar
• heat balance
• temperature field