Justification of the parameters of the transport and technological scheme of wood supply in flat raft units according to the raft (ruler) - raft principle

Resumption of timber rafting on small and medium rivers, where log drifting had been previously performed, includes not only the improvement of flat raft units and rafts with a low draft, but also the development of technological processes for performing a complex of works using improved raft units and rafts based on them. The developed transportation and technological scheme for the supply of wood on the principle of raft section lines - raft performs on the basis of flat raft units. The theoretical studies of the proposed transportation and technological scheme made it possible to develop an original method for calculating the parameters of all the main objects (a river lower landing, bundling and re-bundling grounds, a log receiving port). To justify the required area of the river lower landing special attention was paid to calculation of the area of the production site and ground. We took into account the fact that flat raft units are formed with bundling machines and grapple loaders, and the transportation of flat raft units is carried out by special transport machines. When calculating the required water area for bundling and re-bundling grounds the emphasis is placed on the use of raft designs that exclude the reversal of raft units and lines during their formation. To calculate the required area of the log receiving port the author also took into account the fact that the flat raft units are unloaded out of the water with tower cranes and disassembled with separating machines while raft units are loaded with transportation machines, and grapple loaders unload the logs from the separating machines. The practical application of the developed transportation and technological scheme and methods for determining the parameters of its main objects will entail the resumption of wood rafting on small and medium rivers. Thus the optimal requirement rate in machines and mechanisms designed to perform various tasks when rafting wood in flat raft units and rafts based on them will be ensured.