RU2327001C1 - Method of replacing railway sections - Google Patents

Abstract

FIELD: railway transportation.

SUBSTANCE: method of replacing the welded railway sections involves the following jobs. After laying the end of the welded section on the base when moving devices are stopped, the rails to be replaces are cut out along the cross-section perpendicular to the line and at a distance from the said end defined from the formula depending upon the designed elongation of the railway section and upon the designed railway section elongation factor defined empirically. Then, the rail ends cut out are moved to the position parallel to the line axis.

EFFECT: higher efficiency method resulted from reduction of labor input and smaller breaks in the railway traffic.

6 dwg

Description

The invention relates to railway transport and can be used when changing welded rail lashes of a welded jointless path with their forced entry into the required temperature range at off-design temperatures.

There is a method of replacing inventory rails with welded rail lashes using the UK-25 track stacker for overhaul of the track (see "Technological processes of a weldless track on reinforced concrete sleepers", approved by the Ministry of Railways, Moscow: Transport, 1973, p. 154), which consists in , what

- unload the welded rail lashes and leveling rails in the middle of the track,

- disconnect the joints at the beginning and end of the section of the change of rails, and also unfasten their connection with the base on this section;

- shifted by longitudinal movement of the set of devices replaceable rails in the middle of the track and at the same time shifted to their place welded rail lashes;

- connect welded rail lashes with leveling rails, and leveling rails connect with each other and with adjacent sections of the track;

- attach welded rail lashes and leveling rails to the base.

The closest in technical essence and the achieved result is a method of forcing rail lashes into the calculated temperature range using a hydraulic tensioning device (see. "Rules and technology for performing basic work at the current track maintenance" / Ministry of Railways of Russia. M.: Transport, 1998, p. .86), consisting in the fact that

- replace with a shorter one of the leveling rails, thereby forming a gap for lengthening the rail lash;

- weaken along the entire length of the welded rail lash connection with the base;

- arrange the anchor sections on both sides of the welded rail lash by tightening the intermediate fastening nuts with the normative force, including:

- on the plot of λ ₁ adjacent to the beginning of the welded rail lash,

- on the plot of λ ₂ at the beginning of the welded rail lash;

- on the plot of λ ₃ adjacent to the end of the welded rail lash;

- mount the tensioning device and fix one of its grips at the end of the lash, and the second gripper of the device - for the anchor section λ ₃ adjacent to the end of the lash, consisting of newly laid rails;

- turn on the operating mode of the tensioner, thereby applying a longitudinal force P to the end of the lash and to the portion λ ₃ and extend the welded rail lash by the calculated value;

- connect the end of the rail whip with the anchor section λ ₃ ;

- attach to the base the end of the welded rail lash in the area λ ₄ , the length of which is determined by the formula

λ ₄ = P / r, where r is the linear resistance of the attached rails to their longitudinal movement;

- turn off the operating mode of the tensioner and dismantle it;

- attach the rail lash to the base on the remaining length.

The disadvantage of this method is the high resource costs, including labor costs and interruptions in the movement of trains.

The technical result of the invention is to increase the efficiency of the method by reducing resource costs: reducing labor costs and interruptions in the movement of trains.

The technical result is achieved by the fact that in the method of changing rail lashes, which consists in the fact that

welded rail lashes and leveling rails are unloaded into the middle of the rail track, and in the leveling span adjacent to the beginning of the rail lash, the leveling rails are interconnected with the overlays and the beginning of the rail lash, the replaceable rails at the beginning and end of their shift section are separated by removing the butt plates, and also they fix the connection of the exchangeable rails with their base on this section, set up a mobile device for shifting the exchangeable rails in the middle of the track, and also a mobile device for Vizhki from the middle of the track and laying in the working position of welded rail lashes and leveling rails, connect both mobile devices with each other and with the traction unit, moving the replaced rails to the middle of the track simultaneously with both rail threads and the welded rail lashes and leveling rails - to the working position and connect the leveling rails with the butt pads with the track section adjacent to the beginning of the welded rail lash, tightening the nuts of the joint bolts with the normative force, tighten the intermediate fastening nuts with the normative force in the following sections: a section of a path with a length of λ ₁ adjacent to the beginning of a welded loop, a section at the beginning of a welded strip with a length of λ ₂ , and a section of λ ₃ adjacent to the end of a welded rail lash, the lengths of these sections being determined by the formulas :

λ ₁ = (PR _H ) / r + 1; λ ₂ = P / r-λ ₁ ; λ ₃ = P / r,

where R _H is the standard joint resistance to the longitudinal movement of the rails, P is the force required to extend the lash and equal

P = α * E * F * (t _3- t _Y ),

where E - modulus of elasticity of steel rail, F - the cross-sectional area of the rail, α - coefficient of thermal expansion of the steel rail, t _Z - calculated temperature rails when attaching the whip at constant temperature, ° C, t _Y - temperature welded rail runner at the time of laying, ° C, fix one of the grips of the tensioner at the end of the rail lash, and the other gripper for the section adjacent to the end of the rail lash, using the tensioner, apply longitudinal force to the end of the rail lash at Linen on the estimated produce twisting regulatory effort nuts intermediate fastenings on the end portion of λ ₄ welded rail runner length λ ₄ = R / r, and then remove the effect of longitudinal force, disassemble the tensioner and produce twisting regulatory effort nuts intermediate fastenings on the remaining portion of the length each welded rail lash, after laying the end of the welded rail lash on the base during suspension of movement of mobile devices, interchangeable rails are cut in section, perp perpendicular to the axis of the track and spaced from the end of the welded rail lash at a distance A, determined by the formula A≥ΔL · K _Z ,

where ΔL is the estimated elongation of the rail lash, determined by the formula ΔL = L (t ₃ -t _Y ) · α, where L is the length of the lash, m; To _Z - empirically determined coefficient of increase in the calculated elongation ΔL,

and then the cut ends of the exchangeable rails are shifted to a position parallel to the axis of the track.

Figure 1 shows the layout of replaceable and stackable rail lashes, as well as the layout of mobile devices, their connections between themselves and the traction unit during the shift of the replaceable rails and slide into the design position of the welded rail lashes (side view).

Figure 2 is a top view of figure 1.

In Fig.3 - the same as in Fig.1, after laying the ends of the welded rail lashes on the rail base (side view).

Figure 4 is a top view of figure 3.

In Fig.5 - the same as in Fig.3, after cutting interchangeable rails in section I-I and shifting their ends to a position parallel to the axis of the track (side view).

Figure 6 is a top view of figure 5.

The method of laying rail lashes is as follows:

Implementation conditions: length of welded rail lashes and track construction L = 800 m P65, type KB fastening, temperature conditions -t _У = 0 ° C, t _З = 35 ° С. Extension of rail lashes is carried out using a hydraulic tensioning device (GNU), with the following main technical characteristics:

Maximum tensile force 700 kN Device length, l _NU 2.39 m Capture length, l _ZAH 0.40 m

Necessary calculations. Determine the design parameters for the forced reduction of rail lashes to the required temperature for a given source data, including:

a) a change in the length of the lash ΔL

ΔL = L (t _З- t _У ) α = 800 · (35-0) · 0.0000118 = 0.330 m = 330 mm,

where α = 0.0000118 is the coefficient of thermal expansion of rail steel,

b) the force P required to lengthen the lash

P = α · E · F · (t _З- t _У ) = 0.0000118 · 2.1 · 10 ⁷ · 82.65 · (35-0) -716 kN,

where α = 0.0000118 is the coefficient of thermal expansion of rail steel, E = 2.1 · 10 ⁷ , N / cm ² is the elastic modulus of rail steel,

F = 82.65 cm ² - the cross-sectional area of the rail type P65,

c) the length of the anchor sections, including

λ ₁ = (P-R _H ) / r + 1 = (716-400) / 25 + 1 = 13.6 m,

where R _H = 400 kN - standard butt resistance to longitudinal movement of rails of type P65,

λ ₂ = P / r-λ ₃ = 716: 25-13.6 = 16.0 m;

λ ₃ = λ ₄ = P / r = 716: 25 = 29.6 mJ

where r = 25 kN / m is the linear resistance of the attached rails to their longitudinal movement

g) the distance And to determine the place of cutting replaceable rails in section I-I

min A≤L · K _З = L (t _З -t _У ) · α · К _З = 800 · (35-0) · 0.0000118 · 1.3 = 0.429 m = 429 mm;

max A = l _NU -l _ZAH = 2.39-0.40 = 1.99 m.

After performing the calculations, the following operations are performed:

welded rail lashes 1 and leveling rails 2 are unloaded into the middle of the rail track, and in the leveling span adjacent to the beginning of the rail lash 1, the leveling rails 2 are interconnected by overlays and the beginning of the rail lash 1 (see Fig. 1 and Fig. 2);

interchangeable rails 3 at the beginning and end of their shift section are disconnected by removing butt pads, and also the connection of interchangeable rails 3 with their base is unfastened at this section;

set in a working position a mobile device 4 for shifting the interchangeable rails 3 in the middle of the gauge, as well as a mobile device 5 for shifting from the middle of the gauge and laying in the working position of the welded rail lashes 1 and leveling rails 2;

connect the leveling rails 2 with overlays 1 adjacent to the beginning of the welded rail lashes 1 sections of the track and tighten the nuts of the joint bolts with the normative force, tighten the nuts of intermediate fasteners with the normative force on the 13.6-meter sections λ ₁ adjacent to the beginning of the welded lash 1, and λ _{2 the} length 16.0 m at the beginning of the welded lash 1 (see FIG. 3 and FIG. 4), after which a vehicle connected to the mobile devices 4 and 5 by longitudinal links 6 is set in motion, thereby interchanging interchangeable p rails 3 in the middle of the track, and welded rail lashes 1 and leveling rails 2 in the working position (see Fig. 3 and Fig. 4);

after laying the ends of the welded rail lashes 1 on the base, the movement of the traction unit and mobile devices 4 and 5 is stopped, and during this suspension the interchangeable rails are cut in section II, perpendicular to the axis of the track and spaced from the end of the welded rail lash at a distance of A = 0.429-1 , 29 m. (See FIG. 5 and FIG. 6) and shift the cut ends of the interchangeable rails 3 to a position parallel to the axis of the track, and also attach to the base the cut ends of the interchangeable rails 3 at a length of λ ₃ = 29.6 m (see Fig. 5 and Fig. 6).

After performing these operations, the ends of the stacked rail lashes 1 and replaceable rails 3 on each rail thread are located on the base coaxially and at a distance from each other equal to A at which the tensioning device can be placed. Since the interchangeable rails 3 are attached to the base, and the stacked rail lashes 1 are unfastened, when the longitudinal forces are applied to them, the stacked rail lash 1 will be lengthened.

Thus, the performed operations create all the prerequisites for the extension of the pair of rail lashes 1 laid on the base without laying the subsequent section behind the welded rail lash, and using replaceable rails 3.

Then, on each rail thread (simultaneously or sequentially), one of the grips of the tensioner 7 is fixed at the end of the rail lash 1, and the other is grasped at the adjacent portion, such as the cut end of the replaced rails 3, located coaxially and at a distance A ( see FIG. 5 and FIG. 6);

then a longitudinal force is applied by the tensioner 7 to the end of the rail lash 1, thereby elongating it by the calculated value ΔL = 330 mm, after which at the end of the welded rail lash, in its section λ ₄ = 29.6 m (see Fig. 5 and 6) produce twisting by the normative force of nuts of intermediate fasteners;

then they remove the action of the longitudinal force, dismantle the tensioning device 7 and tighten with the standard force the nuts of the intermediate fasteners on the remaining portion of its length.

The proposed method for laying rail lashes can be successfully applied on the railway network of Russia.

Claims (1)

The method of changing rail lashes, which consists in unloading welded rail lashes and leveling rails in the middle of the rail track, and in the leveling span adjacent to the beginning of the rail lash, the leveling rails are interconnected with the overlays and the beginning of the rail lash, and the removable rails are disconnected by removing the butt plates at the beginning and end of the section of their shift, as well as the connection of the replaced rails with their base is unfastened on this section, a mobile device for shifting the replaced rails is installed in the middle of the gauge, as well as a mobile device for shifting from the middle of the gauge and laying in the working position of welded rail lashes and leveling rails, connect both mobile devices with each other and with the traction unit, moving the replaced rails in the middle along both rail threads at the same time gauges, and welded rail lashes and leveling rails - to the working position and connect the leveling rails with the overlapping sections adjacent to the beginning of the welded rail lash with butt pads, twisting the nuts of the joint bolts with the normative force, tighten the nuts of the intermediate fasteners with the normative force in the following sections: a section of a path with a length of λ ₁ adjacent to the beginning of the welded whip, a section at the beginning of a welded whip of length λ ₂ and a portion of λ ₃ adjacent to the end of the welded rail whip the lengths of these sections are determined by the formulas λ ₁ = (PR _H ) / r + 1, λ ₂ = P / r-λ ₁ , λ ₃ = P / r, where P is the force required to lengthen the lash, kN, P = α · E · F · (t _W -t _U ); R _H - standard joint resistance to the longitudinal movement of the rails, kN, r - linear resistance of the attached rails to their longitudinal movement, kN / m, E - modulus of elasticity of the rail steel, N / cm ² , F - rail cross-sectional area, cm ² , α - coefficient of thermal expansion of rail steel, t _З - design temperature of the rails when fixing the lash to a constant temperature regime, ° C, t _U - temperature of the welded rail lash at the time of installation, ° C, one of the grips of the tensioner is fixed at the end of the rail lash, and the other is its grip on the section adjacent to the end of the rail lash, with the help of a tensioner, by applying a longitudinal force to the end of the rail lash, it is extended by the calculated value, the intermediate fastening nuts are twisted by the standard force , at the end section λ _{4 of the} welded rail lash with a length of λ ₄ = P / r, after which the longitudinal force is removed, the tensioning device is removed and twisted by the standard force to intermediate fasteners on the remaining length of each welded rail lash, characterized in that after laying the end of the welded rail lash on the base while the mobile devices are suspended, interchangeable rails are cut in a section perpendicular to the track axis and spaced apart from the end of the welded rail lash at a distance of A, defined by the formula A≥ΔL K · _W, where ΔL - calculated elongation rail runner, m, _W K is the defining factor empirically estimated increase elongation ΔL, further shifting the cut ends replaceable rails in a position parallel to the axis of the path.

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