Track Jack

Track Jack

 

a track machine that lays rails and ties during the construction of new railroads and the repair and maintenance of existing ones. Track jacks were first used in the USSR in the 1930’s.

Track jacks are operated cyclically or continuously. Those designed for cyclic operation move on tracks and are used on sections where track must be lifted for repairs. Hoisting tongs engage the rails. The machine has bedplates, which are moved by hydraulic jacks or jackscrews and supported by the ballast between the ties or on the sides of the roadbed. As the bedplates move out, the rails and ties are lifted together with the machine. Additional ballast is applied to the roadbed and the rails and ties are set back in place on a higher level. When the bedplates are raised, the machine’s wheels rest back on the rails and the machine can move to a new section, where the lifting process is repeated. Track jacks develop a force of up to 340 kilonewtons (34 tons-force) for a height of up to 40 cm. Some track jacks have a mechanism that shifts the rails and ties horizontally; such machines are used to straighten tracks.

Track jacks designed for continuous operation are called crawler track jacks and are used in the construction of new railroads. Two freely revolving caterpillar treads are mounted on a wedge-shaped plate located on the track jack. The plate is set under the track being raised in such a way that the ties are supported by the caterpillar treads. The plate is usually attached by cables to a tractor-mounted ballast regulator, located some 15 m ahead of the machine. When the track jack moves at a speed of 2.2–3.8 km/hr, the rails and ties are lifted to a height equal to the thickness of the plate (about 20 cm).

S. A. SOLOMONOV

References in periodicals archive ?
Tenders are invited for Hydraulic Track Jack 18 Ton Capacity Make-Laxmi Or Similar Model No Lhtj -18 Ni
Craig Baxter then failed to track Jack Midson, who was left with a simple header at the back post from a corner to head past Adam Bartlett from close range.
Ohio-based Joyce/Dayton Corp was established by Jacob Joyce in 1873 to produce track jack for the railroad industry and has been concentrated on its current product offerings, which are integrated into equipment used in solar energy generation, satellite antennas and natural gas fracking, for about 50 years.
Christine and Brian visited Scotland last year but were unable to track Jack down - despite staying just 10 miles from his home.
Absolutely his track Jack Absolute has won half of the ten outings he's had at Limerick and in 40 starts has won at only two other tracks.
Tenders are invited for Track Jack Bj Make Track Type Double Acting Trip Lowering Simplex Track Jack Provided With Foot Lift Only Half The Rated Load Can Be Lifted On Foot Without Operating Lever With Specification: Model No 15D A22tw Capacity 15 Ton.
Founded by Jacob Joyce in 1873, Joyce/Dayton began manufacturing an improved track jack for the railroad industry and focused on its current product lines for about 50 years.
Tenders are invited for Hydraulic Track Jack 50 Tons Capicity Make - Vankos , Vanjax, Enerpac, V - Tach, Jack Should Have Rigid, Mono Block Construction Of Cylinder Reservoir And Pump With Base Area Appoximatately 300 Cm 2 To 400 Cm 2 .