The connection elements of wooden structures limited assortment of timber makes it necessary to combine elements of both the wood to length (splice and capacity) and height (rallying). In addition, Farms in the nodes of wooden structures have an angle to attach one element to another. By the nature of the connection means all timber structures can be divided into four groups: 1) working mainly to crushing and shearing. These include vrubki (frontal, jaw, etc.), wedges of different types (prismatic, round, smooth and toothed-ring), 2) working mainly in bending. These include all other pins (Bolt, nail, screws, etc.); pins of hard wood and plate cylinder, and 3) working primarily on the shift (different types of adhesives), 4) working in tension. These include: nuts, clamps bands, steel plates, screws, coach screws and staples, and nails.
Vrubki belong to the oldest means of connection. They have significant shortcomings (large weakening of the working section, a large labor manufacturing difficulties associated with the use of mechanization for their manufacture). All this has led to limited use vrubok today. However, this type of compounds has not lost its value for structural of logs. It is used in some designs, made of planks and boards, as well as in wood coatings, industrial premises, where the evolved gases, harmful effect on the steel elements connection.
Connections to pins, from the usual cylindrical Nagel oak and finishing with steel cylinder of different types (solid or tubular cross-section), there is little impaired working section connected elements. For their production does not require a large amount of material. Nagelnye connections are simple implementation and reliability in operation. For the pins in the form of thin steel rods and wires of conventional nails is not required Pre-drilled holes. In a composite beam is successfully used a wooden dowel plate VS Dersvyagipa. Connections to key undergone recent significant changes. Because of difficulties associated with the use of mechanized equipment manufacturing long oak parallel keys, the latter almost disappeared from use in successfully replaced plate pins. In the node connections and round oak dowel joints supplanted by steel-ring smoothly. The use of circular wedges allowed at the time of the boards to create a complex engineering