Method of replacing railway sections

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

The invention relates to railway transport and can be used when changing the welded rail lashes jointless tracks with a forced input them into the desired temperature range during non-nominal temperature.

There is a method of replacing inventory rails welded rail lashes with the use of railway track-laying machine MC-25 with the repair path (see "processes jointless tracks on reinforced concrete sleepers", decl. IPU, M.: Transport, 1973, s), consisting in the fact that

- unload welded rail scourge and egalitarian rails in the middle of the track,

- sever the joints at the beginning and end of the shift rails, and raskrepljajut on this part of their relationship with the base;

- moved by longitudinal movement of complex devices replacing the rails in the middle of a track and at the same time shifting their place of welded rail scourge;

- connect the welded rail scourge with balancing rails, and egalitarian rails are connected to each other and with adjacent sections of the route;

- attach welded rail scourge and egalitarian rails to the base.

The closest in technical essence and the achieved result is a way to force input rail lashes in the estimated range of temperatures using a hydraulic tensioning device is istwa (see "Rules and technology of execution of the main works during the current contents of the path / the Ministry of Railways. M.: Transport, 1998, p.86), consisting in the fact that

- replace with a shorter one of the levelling rails, thus forming a gap to extend rail scourge;

- weaken the entire length of the welded rail scourge communication with the base;

- arrange anchoring areas on both sides of the welded rail scourge by crackdown intermediate fasteners regulatory effort, including:

- on site λ₁adjacent to the beginning of the welded rail of the scourge,

- on site λ₂at the beginning of the welded rail scourge;

- on site λ₃adjacent to the end of the welded rail scourge;

- mount the tensioner and fix one of its grips over the end of the rod, and the second capture device for abutting the end of the string anchor site λ₃consisting of newly laid rails;

- include an operating mode tensioner, thereby is applied to the end of the rod and section λ₃longitudinal force P and lengthen welded rail whip on the estimated value;

- connect the end of the rail scourge with anchor section λ₃;

- attached to the base end welded rail scourge on the site λ₄whose length is determined by the formula

λ_{4 =R/r, where r is the linear resistance of rails attached to their longitudinal movement;}

_{- off operating mode tensioner and remove it;}

_{- attach rail lash to the basis for the remaining length.}

_{The disadvantage of this method is the large 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: reduce labor costs and interruptions in the movement of trains.}

_{The technical result is achieved in that in the method of the shift rail lashes, namely, that}

_{unload in the middle of the rail gauge welded rail scourge and egalitarian rails, and equalization passage adjacent to top rail of the scourge, connect the pads egalitarian rails between itself and the beginning of the rail scourge, sever removing splices replacing the rails at the beginning and end of their shift and raskrepljajut on this site due exchangeable rails with their base, set in the working position of the mobile device for shifting exchangeable rails in the middle of a track, as well as a mobile device for shifting from the middle of the track and laying in the working position of the welded rail lashes and egalitarian rails, connect both links p revigny device between themselves and with the traction unit, the movement of the vehicle simultaneously on both rail threads successive shift rails in the middle of the gauge and welded rail scourge and egalitarian rails into position and connect the butt plates equalization rail adjacent to the beginning of the welded rail scourge section of the route, spinning butt nut bolts normative force, twist the normative force of the nut intermediate fasteners on the following areas: segment length λ1adjacent to the beginning of the welded loop, the plot at the beginning of the weld lashes long λ2and the plot λ3adjacent to the end of the welded rail scourge, and the length of these sections are defined by the formulas:}

λ₁=(P-R_H)/r+1; λ₂=R/r-λ₁;λ₃=P/r,

where R_H- regulatory butt resistance to longitudinal movement of rails, R - the force required to extend the scourge and equal

P=α*E*F*(t_3-t_Y),

where E is the modulus of elasticity of steel rail, F is the cross-sectional area of the rail, α - the coefficient of thermal expansion of rail steel, t_C-the estimated temperature of the rails when mounted whip at a constant temperature, °S, t_Y- the temperature of the welded rail scourge at the time of its installation, °To fix one of Akhmatov tensioner for the end rail of the scourge, and the other gripping section adjacent to the end rail of the scourge, with the aid of a tensioning device, by the application of a longitudinal force to the end rail of the scourge produce its extension to the settlement value, producing twisting of the normative force of the nut intermediate fasteners at the end λ₄welded rail lashes long λ₄=R/r, and then remove the longitudinal force, remove the tensioner and produce twisting of the normative force of the nut intermediate fasteners on the remaining length of each welded rail scourge, after laying the end of the welded rail scourge on the base during suspension movement of the mobile device is cut by the rails in cross section perpendicular to the track axis and spaced from the end of the welded rail scourge on the distance And defined by the formula A≥ΔL·_C,

where ΔL is the calculated elongation of the rail scourge, defined by the formula ΔL=L(t_3-t_Y)·αwhere L is the length of the scourge, m; K_C-empirically defined magnification calculated elongation ΔL,

and then shift the cut ends of the exchangeable rails in position, parallel to the axis of the path.

Figure 1 shows the layout of the exchangeable and stacked rail lashes, as well as the layout of the PE ewiglich devices their relations among themselves and traction unit during shift exchangeable rails and sliding in the design position of the welded rail lashes (side view).

Figure 2 - top view figure 1.

Figure 3 is the same as in figure 1, after installation all welded rail lashes on podrelsovoe base (side view).

Figure 4 is a top view of figure 3.

Figure 5 - same as figure 3, after cutting exchangeable rails in cross section I-I and shift their ends in position parallel to the track axis (side view).

Figure 6 - top view figure 5.

The method of laying rail lashes as follows:

Conditions of implementation: long welded rail lashes and design path L=800 m R65, bond type KB, temperature t_Y=0°C, t_C=35°C. Elongation rail lashes done using a hydraulic tensioner (SSI), with the following main technical characteristics:

The necessary calculations. Determine design parameters to help enforce rail lashes to the required temperature for the specified source data, including:

ΔL=L(t_C-t_Y)α=800·(35-0)·0,0000118=0,330 m=330 mm,

where α=0,0000118 - coefficient of thermal expansion of rail steel,

b) the force P required for lengthening lashes

P=α·E·F·(t_C-t_Y)=0,0000118·2,1·10⁷·82,65·(35-0)-716 kN

where α=0,0000118 - coefficient of thermal expansion of rail steel, E=2,1·10⁷N/cm²- the modulus of elasticity of rail steel,

F=82,65 cm²- the cross-sectional area of the rail-type P65,

in) length of anchor sites, including

λ₁=(P-R_N)/r+1=(716-400)/25+1=13.6 m

where R_H=400 kN - regulatory butt resistance to longitudinal movement of rails type R65,

λ₂=R/r-λ₃=716:25-13,6=16,0 m;

λ₃=λ₄=P/r=716:25=29,6 mu

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

g) distance And to determine where exchangeable cutting rails in cross section I-I

min A≤L·_C=L(t_C-t_Y)·α·_C=800·(35-0)·0,0000118·1,3=0,429 m=429 mm;

max A=l_WELL-l_ZECH=2,39-0,40=1,99 m

After performing the calculations, the following actions:

unload in the middle of the welded rail track rail 1 scourge and egalitarian rails 2, and the surge in migration, primasius the m to the beginning of the rail scourge 1, connect the pads egalitarian rails 2 between itself and the beginning of the rail whip 1 (see Fig 1 and 2);

sever removing splices successive rails 3 at the beginning and end of their shift and raskrepljajut on this site due exchangeable rails 3 with their base;

set in the working position of the mobile device 4 to shift exchangeable rails 3 in the middle of the gauge, and the mobile unit 5 to shift from the middle of the track and laying in the working position of the welded rail lashes 1 and egalitarian rails 2;

connect the pads egalitarian rails with 2 adjacent to the beginning of the welded rail lashes 1 track sections and tightening the screws butt bolts normative force, twist the normative force of the nut intermediate fasteners on the sites λ₁length 13.6 m adjacent to the beginning of the weld scourge 1, and λ₂length of 16.0 m at the beginning of the weld whip 1 (see Fig 3 and 4), after which drive the vehicle, coupled with mobile devices 4 and 5 lengthwise 6, thereby simultaneously on both rail threads successive shift rails 3 in the middle of the gauge and welded rail scourge 1 and egalitarian rails 2 in the working position (see figs 3 and 4);

after laying all welded rail lashes 1 on the base, move the traction unified the hospitals and mobile devices 4 and 5 suspend, and during this pause is cut by the rails in cross section I-I, perpendicular to the track axis and spaced from the end of the welded rail scourge at a distance A=0,429-1,29 m (see Fig 5 and 6) and shift the cut ends of the exchangeable rails 3 in a position parallel to the axis of the path, and also attach to the base of the cut ends of the exchangeable rails 3 length λ₃=29,6 m (see Fig 5 and 6).

After performing these operations, the ends of the stacked rail lashes 1 and replacing rails 3 on each rails are located on the base coaxially and at a distance from each other equal to A, which can accommodate tensioner. As successive rails 3 is attached to the base and stacked rail scourge 1 lashing, then the application to them of the longitudinal forces to be extended will be stacked rail whip 1.

Thus, the executed operations create preconditions for lengthening laid on the basis of the pair of rail lashes 1 without housing for welded rail whip the next section and using exchangeable rails 3.

Next, for each rails (simultaneously or sequentially) fix one of the grips of the tension device 7 at the end of the rail 1 scourge, and the other grip over the adjoining land, which is cut off the end of exchangeable rails 3, set of soon is located at a distance a (see Fig 5 and 6);

then the tensioning device 7 apply a longitudinal force to the end rail of the scourge 1, to thereby produce the elongation on the estimated value ΔL=330 mm, after which the end of the welded rail whip on her site λ₄=29,6 m (see Fig 5 and 6) is produced by twisting the normative force of the nut intermediate fasteners;

next remove the longitudinal force, disassemble tension device 7 and produce a tightening of the regulatory effort nuts intermediate fasteners on the remaining section of its length.

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

Change the rail lashes, namely, that unload in the middle of the rail gauge welded rail scourge and egalitarian rails, and equalization passage adjacent to top rail of the scourge, connect the pads egalitarian rails between itself and the beginning of the rail scourge, sever removing splices replacing the rails at the beginning and end of their shift and raskrepljajut on this site due exchangeable rails with their base, set in the working position of the mobile device for shifting exchangeable rails in the middle of a track, as well as a mobile device for shifting from the middle of the track and laying in working position swar what's rail lashes and egalitarian rails, connect both links of mobile devices among themselves and with the traction unit, the movement of the vehicle simultaneously on both rail threads successive shift rails in the middle of the gauge and welded rail scourge and egalitarian rails into position and connect the butt plates equalization rail adjacent to the beginning of the welded rail scourge section of the route, spinning butt nut bolts normative force, twist the normative force of the nut intermediate fasteners on the following areas: segment length λ₁adjacent to the beginning of the weld scourge, the plot at the beginning of the weld lashes long λ₂and the plot λ₃adjacent to the end of the welded rail scourge, and the length of these sections are based on formulas λ₁=(P-R_H)/r+1, λ₂=R/r-λ₁that λ₃=R/r,

where P is the force required to extend the scourge, kN, R=α·E·F·(t_C-t_Y);

R_H- regulatory butt resistance to longitudinal movement of rails, kN, r - linear resistance rails attached to their longitudinal movement, kN/m, E is the modulus of elasticity of rail steel, N/cm²F is the cross-sectional area of the rail, cm²that α - the coefficient of thermal expansion of rail steel, t_C- raschet the I temperature of the rails when mounted whip at a constant temperature, °S, t_Y- the temperature of the welded rail scourge at the time of its installation, °C

fix one of the grips of the tension device for the end rail of the scourge, and the other gripping section adjacent to the end rail of the scourge, with the aid of a tensioning device, by the application of a longitudinal force to the end rail of the scourge produce its extension to the settlement value, producing twisting of the normative force of the nut intermediate fasteners, at the end λ₄welded rail lashes long λ₄=R/r, and then remove the longitudinal force, remove the tensioner and produce twisting of the normative force of the nut intermediate fasteners on the remaining length of each welded rail scourge, characterized in that after laying the end of the welded rail scourge on the base during suspension movement of the mobile device is cut by the rails in cross section perpendicular to the track axis and spaced from the end of the welded rail scourge on the distance And defined by the formula A≥ΔL·_Cwhere ΔL is the calculated elongation of the rail scourge, m, K_C-empirically defined magnification calculated elongation ΔL, then shift the cut ends of the exchangeable rails in position, parallel to the axis of the path.