SU1346717A1 - Method of mounting rail lengths of continuously welded track - Google Patents

Abstract

The invention relates to railway transport, and in particular to methods of mounting rail braids of a continuous rail. The purpose of the invention is the extension of the temperature range of mounting rail lashes, increasing the uniformity of temperature stresses in them and increasing productivity. Rail lashes are placed in a design position relative to their middle, fixed on the basis of the middle part of the lashes at a design length determined depending on the magnitude of the stresses generated in the lash, the condition and type of ballast, the diagram and the type of sleepers, rails and fasteners, and then change the length of the unfixed half-webs, connect them with the adjacent rails, align the stresses and secure the half-strings on the base. from 4 O5

Description

113

The invention relates to railway transport, and in particular to methods of mounting rail braids of a continuous rail.

The purpose of the invention is the extension of the temperature range of mounting rail lashes, increasing the uniformity of temperature stresses in them and increasing productivity.

The method is carried out as follows.

Rail braids are mounted from rails, for example, of the type P-65 with a design length of 800 m at the actual fixing temperature, while simultaneously bringing their stress state to the optimum fixing temperature on the continuous operation mode t.

Since the actual fixing temperature is less than optimal by the value of tJ, –1f, it is necessary to provide for the creation of tensile stresses in the rod due to its elongation by the value of

/ 11 L (t Р -t) - 189 mm, where is the linear expansion coefficient of rail steel 1 / degree,

The possibility of such an extension is realized by leaving gaps between the ends of the lash and equalizing rails. The size of the gaps is determined by the formula

Jl -

d

t

where ° is the calculated temperature gap corresponding to t

f.

Prine in for this case mm

will get

 5 - 99.5 mm.

- 1 | 2-.

Rail lashes are laid in the design position relative to their mid-rim), leaving equal gaps (99.5 mm) between the ends of the lashes and the equalizing rails adjacent to them. Then fixed on the base of the middle part of the lashes on the length 1.

1 - R g

where r is the linear resistance of the rail-spacing lattice to the longitudinal shear related to one rail scourge (can be equal to 7 kn / m); P is the longitudinal force arising in each rail lash from temperature changes.

five

because

1. The value of P can be determined by the formula

R p - tf) ". |, Where E is the modulus of elasticity of the rail

become;

U) is the cross-sectional area of the rail (for a rail P-65, equal to 82.56-10 mM, (Y 2.5-10 kPa.

2, 5-ЮЧЗО-10). 82.56-10. „- i As: 59 m,

 7

Thereafter, the lengths of the unfixed half-webs are changed separately on either side of the fixed section of the lashes to obtain gaps with / (D 5 mm between their ends and the adjacent equalizing rails. The length of the half-webs can be changed by heating or stretching them.

Then, connect the ends of the half-webs with equalizing rails with butt joints, level the stresses

5 on unfixed half-sleeves x, for example, placing them on rolling supports or applying a vibration load and fix them on the base by means of intermediate fasteners.

Claims (1)

Invention Formula 0 , th The method of mounting rail lashes The 2g of the continuous track, which consists in placing the rail lashes on the base into the design position, fixing part of their length on the base, changing the length of the fixed sections of the lashes to the required value, connecting the ends of the lashes with adjacent rails, leveling the stresses along the length lashes and fasten them on the ground, differing from 45 to the fact that, in order to extend the temperature range of mounting rail lashes, to increase the uniformity of temperature stresses in them and to increase the productivity 5Q of labor, rail lashes are laid in the design position relative to their middle, fixed on the basis of the middle part of the lashes on the length determined by the formula 55P where 1g is the length of the fixed section of each rail scourge; 31346717 P is the longitudinal yielding that occurs, referring to one rail lash in each rail rail, and when the temperature changes from the optimum temperature — and then separately on either side of the fastening to the mode of the fixed portion of the lashes to the length of the fixed fixed temperature of the fixed-lash, connect the ends of the lash with the appliance; moung rails, level the longitudinal resistance of the rail to the fixed half-ridge lattice of the longitudinal lash x and fastened They are based on them.