Switch rail heel end joint structure of railway switch

Abstract

The invention relates to a switch rail heel end joint structure of a railway switch. The switch rail heel end joint structure of the railway switch comprises a base rail I, a switch rail, base rails II and a backing plate, wherein the base rail I, the switch rail and the base rails II are all arranged on the backing plate. An abrasion-resistant spacer sleeve is inserted into a rail web mounting hole at the switch rail heel end, and the basic rail I and the switch rail are connected and fixed together through a common high-strength bolt pair penetrating through a rail gasket, an appropriate spacer block, the abrasion-resistant spacer sleeve I and a clamping plate. The basic rail I and the basic rails II are connected and fixed together through the common high-strength bolt pair, an outer rail support, the appropriate spacer block, an inner rail support and the clamping plate. Four nut seats and a retaining shoulder are fixed to the backing plate, and the retaining shoulder is positionedoutside the nut seats outside the basic rail I. The inner rail support and the outer rail support are separately arranged in the four nut seats in a screwing mode through two bolts installed from topto bottom and are fixed, and the outer end surface of the outer rail support abuts against the inner end surface of the retaining shoulder. The switch rail heel end joint structure of the railway switch overcomes the defects of the prior art.

Description

technical field [0001] The invention belongs to the technical field of railway turnouts, and in particular relates to a heel end joint structure of a railway turnout point rail. Background technique [0002] In order to meet the line design and on-site construction conditions of the existing railway turnout products, most of the small-number railway turnouts of No. 9 and below with a straight-line driving speed of less than 100km / h adopt the switch rail heel joint structure. The heel end structure of the movable joint switch rail has many advantages such as flexible switching of the switch rail, small pulling force of the switch rail, and the design of the switch rail to any length. It is widely used in small-number turnout products. But the traditional structure has the following problems: [0003] 1. During the assembly process of the turnout, since the double-ended studs can only penetrate from one side of the switch rail, the installation of all parts of the turnout exc...

AI Technical Summary

Problems solved by technology

Since the spacer iron often needs to be repaired and ground many times during the installation process, every time the spacer iron needs to be dismantled other than the track and the outer rail support, the installation process is cumbersome and labor-intensive. The main reason is that The studs can only be penetrated from the side of the switch rail;

[0004] 2. During the use of the turnout, it is very difficult to replace the double-ended studs at the laying site of the turnout. Before the replacement, all parts except the track and the outer rail support must be dismantled, which takes a long time for construction;

[0005] 3. The shaft shoulder of the double-ended stud is easy to wear, which can easily cause the overall failure or fracture of the stud, and it is difficult to replace the bolt during maintenance;

[0006] 4. The part where the spacer iron contacts the shoulder of the double-ended stud is easy to wear, which will easily cause serious wear around the hole where the spacer iron contacts, and it is very difficult to repair;

[0007] 5. The installation bolts of the inner and outer rail supports of the heel must be installed from bottom to top. During the construction process, due to the limited operating space, it is inconvenient to install. After the bolts are cap nuts, the bolts cannot be observed after they are loose.

[0008] 6. In complex turnout forms, if a live joint structure is adopted, the installation, laying and maintenance of the turnout are more difficult due to the restrictions on the installation and withdrawal directions of the double-ended studs

When the studs at the heel end of the outer switch rail need to be replaced due to maintenance, all the inner switch rail and basic rail components adjacent to the side switch rail must be removed, and the on-site construction work will nearly double.

[0009] 7. When used in the form of integral ballast bed, if the clear distance between the upper surface of the concrete layer and the lower surface of the backing plate is less than the length of the mounting bolts of the rail support, the bolts cannot be withdrawn and the rail support cannot be disassembled, and the maintenance and repair at the heel of the sharp rail is difficult

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