B. B. Danilov

Determination of conditions for compressed air-assisted removal of plastic soil in horizontal pipeline in drilling

Under discussion is plastic soil removal in horizontal rotating pipeline by air flow. It is experimentally proved possible to remove soil by batches generated during rotation of the pipeline. The found relationship between soil conveying in the pipeline, the pipeline diameter and air forward pressure is made the basis for determination of the parameters of the main transporting line in a drilling installation.

Concerted operation of pneumatic percussion tool and air-aided chips removal line in horizontal hole drilling machines

The authors study work process of pneumatic percussion units with valveless air distribution under exhaust back pressure in drilled solid removal line in long horizontal hole drilling machines. It is shown that range of efficient values of the machine performance equal to maximum percussion force does not change under increase in the exhaust back pressure.

Experimental substantiation of broken soil transportation in horizontal borehole drilling

The authors experimentally confirm the efficiency of the pneumatic transportation of broken soil through a horizontal rotary pipeline in the horizontal hole-making in soil under the integrated effect of a drilling machine.

Borehole Driving with Pneumatic Punchers and Impact Devices Having an Annular Instrument

Substantiation is provided for a method of forming boreholes in which part of the soil is removed from the borehole and part is displaced into the mass. Interaction between the pneumatic puncher and the soil is examined, when the pneumatic puncher is used with an impact device having an annular instrument. Calculated relations are obtained to determine the rate of driving of the borehole.

Improvement of Pipe Pushing Method

In focus is improvement of hole-making technology by vibro hammer pushing with batch-wise removal of soil core while a pipe is driven in soil under impact loading. The important advantage of the technology is the concurrent pipe driving and soil core removal. The minimal air pressure required to separate a core and transport it along the pipe is determined. The frequency of soil core separation and transport during vibro-hammer driving of pipes in soil has been tested in underground construction of utilities. The tests prove the possibility to cut-down time of trenchless construction of underground passages and to raise the level of mechanization of the operations.

Determination of length of horizontal pneumatic transport line in drilling machine for mud removal by negative pressure

Under discussion is soil transport by negative pressure generated in horizontal rotating pipeline. Based on the relations between soil batch velocity, soil batch mass and diameter of the pipeline, the authors have developed procedure to determine the limit pipeline length. The rotary velocity of the pipeline is related with its diameter. Reliability of the proposed procedure results is experimentally proved.

Justification of basic diagrams of horizontal drilling deflectors

The authors discuss approaches to engineering a directional drilling tool to be used in underground mining and construction. Justification is provided for operating principles of devices for deflection of drilling in a required direction. Experimental research of changing pneumatic drilling machine trajectory in soil is reported.

Finding Forces Required to Change Air Hammer Path in Soil

The authors solve the problem on forces required to change drilling path of air hammers in soil. Soil mass is assumed a rigid–plastic medium with the Mohr–Coulomb yield, and the air hammer deviator is considered as a nondeformable body. The problem is solved in two stages: introduction of the deviator in soil and travel of the air hammer in soil with the rear deviated at a certain angle. The loads applied to the rear, the forces and the moment required to changing the path of an air hammer in soil are calculated.