SU805956A3 - Wooden sleeper - Google Patents

Abstract

1494379 Wooden railway sleepers AKA DEMIA ROLNICZA 9 Dec 1975 [17 Dec 1974] 50343/75 Heading E1G A wooden railway sleeper 1 is provided in each rail-mounting zone thereof with at least one insert 2 of material harder than the wood of the sleeper and improving the compressive strength of the sleeper in places where anticipated loads may exceed the strength of the wood. The insert may be made of hard wood, wood impregnated with plastics material or plastics material. The insert is wedge shaped in cross-section and is fitted in a complementarily-shaped groove or recess in the sleeper running transversely to the longitudinal centre line of the sleeper in order to redirect pressure applied from above from perpendicular to diagonal or parallel relative to the wood grains in the sleeper. In order to prevent lengthwise cracking of the sleeper, the crosssectional dimensions of the wedge-shaped insert may be greater at its ends than in its middle portion, both widthwise and depthwise as shown in Figs. 7-9.

Description

; 54) WOODEN CROSS

one

The invention relates to a superstructure, in particular for railway tracks.

A wooden sleeper is known, having a liner made of a harder material in the places where rail strands are fastened, the lateral surfaces of which are located obliquely to the fibers of wood sleepers ClJ.

The disadvantage of this sleeper is that the installed inserts do not ensure the safety of the sleepers due to the presence of the edges of the slope of the side surfaces, which would entail smothie sections of the sleepers in which the sleeves are located.

The purpose of the invention is to increase the service life of the sleepers.

This goal is achieved by the fact that the wooden sleeper has at least one liner of a harder material than the sleeper material, the side surfaces of which are located obliquely to the fibers of the timber sleepers, and the liner is made in the form of a prism with a wedge-shaped transverse section and strengthened with the edge of the wedge down in the notch of the corresponding form

by means of a bonding material, with the longitudinal axis of the liner located across the longitudinal axis of the sleeper.

FIG. 1 — a sleeper with a resting rail and its fastening elements, cross section — in FIG. 2 - the same part of the sleeper (without rail and fastening elements), top view; in fig. 3 another type of implementation of the sleepers.

Wooden sleeper 1 under each rail is provided with inserts 2 in the form of wedges with a rounded tip. Each of the liners 2 is planted in the groove of the sleepers. There is a gap between the bottom of the groove and the bottom of the liner. The liner 2 covers the entire width of the sleepers. I

Claims (1)

The force F, with which the gasket 3 exerts pressure on each of the liners 2 in accordance with the principle of the wedge, is distributed to two components of the force F and F-, with which the side walls E1 of the liner 2 act on the sleeper 1. The forces F and Fj are directed towards from the direct direction of the fibers, the sleepers, and their horizontal components F, and F, which are parallel to the wood fibers, are more-vertical components FH and P, 2, and are the perpendicular fibers and fibers. The force F is primarily distributed along the fiber and only slightly acts across the fibers. The junction surface of the liners 2 with the sleeper 1 is greater than the free surface of the liner 3. Due to this, when using liners 2, smaller pressures are obtained per unit surface of the shaft compared to the pressure / pressure exerted. . Such an embodiment of the device makes it possible to change the direction of the pressure transmitted from the rails, namely: the c-vertically direction of the wood fibers to or inclined relative to these fibers. parallel to them. Claims of the invention Wooden sleeper, in particular for railway and crane runways, having at least one -inserts of harder material than the sleepers, the lateral surfaces of which are inclined to the sleepers fibers, characterized in that that, in order to increase the service life of the sleepers, the liner is made in the form of a prism with a wedge-shaped cross section and strengthened with the edge of the wedge down in a groove of a corresponding shape by means of a bonding material, with the longitudinal axis laid transverse to the longitudinal axis of the sleeper. Sources of information taken into account in the examination 1.Patent of France No. 426346, cl. 19a, 2, pub. 1911.