Planning timber delivery to consumers according to the transport and technological scheme of raft (section lines) — raft

The practical implementation of a transport and technological scheme operating on the raft section lines — raft principle on the basis of an improved flat — flow unit requires planning the delivery of timber to consumers. For high-quality planning of timber rafting, it becomes necessary to justify the overall dimensions of a flat raft unit and rafts for various purposes, the design of which is based on this raft unit. A method to calculate the overall dimensions of a flat raft unit, a raft (section lines) for the initial wood floating and a raft for the main wood floating is proposed. When justifying the dimensions of this raft unit and rafts for various purposes, their actual length, width, height, initial draft and volume of wood content are calculated. Based on the proposed methodology, planning timber delivery to consumers was performed taking into account time-optimal span of the initial timber raft floating during one navigation and the rational arrangement of towboats. Provided the volume of the raft (section line) is 171.26 m3 with the annual wood turnover in the onshore warehouse of 9.0 thousand m3 and the time-optimal span of the initial raft of timber floating of 160 days, then one towboat is used with the turnover time of three days. If the annual wood turnover in the onshore warehouse is 20.0 thousand m3 and the time-optimal span for the initial timber raft floating is 120 days, then two towboats with a turnover period of two days are used, provided that the volume of the raft (section line) is 171.26 m3. In the event that the annual turnover of wood in the onshore warehouse is 30.0 thousand m3, and the time-optimal span for the initial timber raft floating is 180 days, then three towboats with a turnover period of three days should be used if the volume of the raft (section line) is 171.26 m3. On the main raft timber floating with an average volume of wood in a raft of 3425.27 m3, it is necessary to use one towboat and, depending on the transport conditions, auxiliary towboats or special raft control tools.

towboat, timber, flat raft unit, initial draft, coefficient of raft-section density