原文：Hoist the basic design of several issuesAbstract: This paper hoist and load transfer between the concrete foundation for a more detailed analysis; compared with the norms on the basis of the determination of stability factor on the basis of the stability of the hoist recommendations Coefficient value; and sets out to improve the upgradeResistance Capability of machine base measures for design.Key words: local pressure; shear keys; overturning; anti-slip; stabilityPrefaceSurface coal mine hoist room is an important part of the production system.Tied with Derrick important structures for the upgrading of the system.With the increase in coal production capacity, upgrading the previous single-mode can no longer meet the needs of modern production, the progressive development of multi-round, multi-rope lifting way.Enhance the ropes pull also increased and role of tension based on the hoist is also growing.The past, the basis of a single Shengti lift weight alone can meet the requirements to enhance the stability of machine.Requirements may construct the foundation made of plain concrete foundation.Mine is a large machine used in multi rope, then part of the foundation alone hoist weight falls far short of basic stability.Need to broaden the basis of weight or other technical measures using other anchor.Thereby enhancing machine-based design raises new problems and new demands, more and more attention by the engineering and technical personnel.1 Hoist-based stress analysis1.1Determination of hoist rope tensionWire rope at one end and raise the container skip or cage connected to the other end is connected with the hoist drum.Derrick and hoist through the support form the basis of force balance system.Therefore, the wire rope in the rope load derrick load can indeed.Determined as follows:1) The normal work load when the hoist rope (Qk) Standard value: press Mine headframe design GB50385 - 2006 No. 41113 in the calculation.2) when the wire rope off rope load (Ak) standard values for single-Sheng Ti l, in which a rope for the break Sheng He set out, the other 2 times the normal load; for multi rope, of which the sideSheng He set all the broken rope, the other side of the 0133 times for all the rope off Sheng He set.1.2Hoist equipment and basic load transfer betweenGeneral equipment manufacturers to provide information to enhance machine-based, and structure associated with: Equipment and size point of the force, Hole, casing, bolts and steel shear keys and so on.Figure 1. Known by the Figure 1: hoist by bolts in tension, shear steel shear key to the level of force transmission to the foundation.Hoist the basis of the whole, for the massive foundation.Computational model of a rigid body, based on relatively little between the various parts of deformation, stress level is low, generally may from time to calculate an overall strength.70s Red Flag Factory in the 20th century brand compressor assembly-based determination of the surface of steel stress is only 70 140N / cm2 1.The large volume of concrete foundation construction concrete hydration heat in order to prevent the formation of internal and external temperature, and the temperature cracks, generally require basic structural steel surface configuration.But in the elevator equipment and the direct interaction between the concrete foundation of some of the stress concentration significantly, the need for computing and reinforcement, the designer often easy to overlook.Mainly for the following two parts: the basis of concrete local office bolt pressure plate, steel embedded in concrete shear key part.The two sites of force transmission to the base hoist the key parts of the design should enhance the machine-based reinforcement calculation of local stress and attention.The following detailed discussion of these two parts separately.1.2.1Partial pressure of concreteGeneral bolts provided by the manufacturer, asked the location of civil engineering profession in the corresponding buried steel casing, elevator bolt and pull through the nut on the local pressure of concrete delivered to the concrete foundation.Concrete local force model similar to the anchor plate with end.Concrete in the base 450 along the failure surface diffusion to form a cone.In order to avoid brittle fracture, can be extended to form a larger cone bolt failure surface, or around the bolt to configure the reinforced concrete so that the bolt pull in whole or in part by the reinforced passed on.At this point requested by the destruction of tensile reinforcement in the cone base plane and the lower part of the length of not less than the tensile reinforcement anchorage length.Nut washer in concrete in the local compressive stress is concentrated, in order to prevent local crushing of concrete, this should be part of the reinforced concrete configuration indirect binding, the specific calculation and co