摘要:
A rail fastening system for fastening a rail to a rail support includes a frame member supported by the rail support and including an upper bracing portion positioned above the rail support to define therebetween a space. A stationary insulator member is positioned at a fixed location on the rail support. A plate-shaped spring blade has a first end resting on the stationary insulator member and an opposite second end supported by a movable insulator member. A wedge member is connected to the spring blade and is operable to be inserted into the space, thereby inserting the spring blade into the space with the first end of the spring blade being supported and sliding on the stationary insulator member and with the second end of the spring blade being supported on and moving the movable insulator member in the insertion direction. The wedge member is braced against the bracing portion of the frame member and causes the spring blade to deflect downwardly to press the opposite ends of the spring blade against the insulator members while the opposite ends of the spring blade are deflected or urged upwardly.
摘要:
A narrow metal plate is embedded in the upper surface of a concrete tie and is curved at one end to form a vertical abutment which projects several centimeters. The plate extends under a rail and is fixedly attached to a tightening bolt which extends through a clip, the end portions of which correspond respectively to the edge of the flange or foot of the rail and the curved end portion of the plate, so that the plate alone supports the tightening forces.
摘要:
According to the invention, reinforcement bars (1; 11; 21; 22) which are usually welded, are assembled by means of clips (30) which are elastically clipped in position at the nodes formed by the bars (2, 12, 21).These clips also perform a spacing function when the reinforcements are placed in position in the moulds employed for manufacturing reinforced concrete products.Application in particular in the manufacture of reinforced concrete ties.
摘要:
A structure for fixing a rail to a tie includes a short stud 24 which is embedded in the concrete 2 of a tie above the longitudinally extending metal strut 4 of the tie and on the axis thereof. Welded to this stud, and even half embedded therein, are upper portions of two arch elements 26 whose branch are divergent on each side of the strut and are bent at their ends in the vicinity of the horizontal central axis of the strut so as to constitute hooks 34.
摘要:
An elastic rail pad to be positioned between a tie and a rail includes a first portion to be positioned beneath a foot of the rail at the field side thereof, a second portion to be positioned beneath the rail foot at the gauge side thereof, and a connecting portion connecting the first and second portions and having a dimension in a direction parallel to the longitudinal dimension of the rail less than dimensions of the first and second portions in such direction. The first, second and connecting portions of the pad are in the form of a single, integral member formed of a relatively stiff elastomeric material having the properties of high resistance to wear and tangential shear forces, high elastic memory and elastic stability over a wide range of varying temperatures.