Type V High Speed Fasteners System

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The Type V railway fastening system is a mechanical fastening device specifically designed for shouldered prestressed concrete sleepers, serving as a key component that connects rails and sleepers in railway track structures. It utilizes the bolted connection between spiral spikes and sleeves as the core fastening method, generates stable clamping force through spring steel clips of different specifications such as W2 and X3 types, achieves precise gauge adjustment with engineering plastic gauge retainers, and simultaneously fulfills both insulation and buffering functions by means of rubber pads.

Structurally, this system integrates rigid constraints and elastic buffering properties. It not only relies on the concrete shoulders of sleepers to provide lateral position limitation but also adapts to the slight displacement of rails under train loads through the elastic deformation of the clips. While ensuring the stability of track geometric parameters, it can effectively absorb the vibration energy between wheels and rails. Its design fully takes into account the needs of different line conditions; by replacing the types of clips, it can flexibly adjust the clamping force and longitudinal resistance, thus playing a reliable fastening role in diverse scenarios such as conventional-speed mainlines, passenger-freight shared lines, and bridge sections. It is a mature fastening solution that balances structural stability, maintenance convenience, and scenario adaptability.

Core Elastic Restraint Components

Made of 60Si2Mn spring steel, they are divided into W2 type (for general sections) and X3 type (for low-resistance sections on bridges). The W2 type elastic clip has a "V" - shaped symmetrical structure, which clamps the rail through three-point contact and provides a stable clamping force of ≥11kN; the X3 type elastic clip has a gentler radian, with the clamping force reduced to ≥6kN, which is suitable for the expansion and contraction needs of bridges and has both elasticity and load transmission functions.

Core Fastening Components

The spiral spike is connected with the nylon sleeve pre-embedded in the sleeper through threads, fixing the elastic clip on the sleeper to form a detachable mechanical fastening structure. The sleeve is made of reinforced nylon material, which is not only insulating but also can buffer the force on the spike, avoiding cracks in the sleeper concrete due to rigid contact, and at the same time facilitating the repeated disassembly, assembly and maintenance of the spike.

Key Components for Size Adjustment

Made of engineering plastics, they are available in 7 specifications from No. 2 to No. 8 (with a step difference of 2mm) and are clamped between the elastic clip and the sleeper shoulder. By replacing retainers of different thicknesses, precise gauge adjustment of ±8mm can be achieved. Meanwhile, they isolate metal components to avoid stray currents and have both insulation and size compensation functions.

Buffering and Insulating Components

Including under-rail pads and under-iron pad pads, they are made of chloroprene rubber. The under-rail pad is in direct contact with the bottom of the rail, with a thickness of about 10-12mm, and absorbs wheel-rail vibration through elastic deformation; the under-iron pad is placed between the iron pad and the sleeper, which further buffers the load and blocks track circuit interference.

(1) During the initial operation period, attention should be paid to observing the usage of fasteners and sleepers. If fastener loosening occurs due to the compressive residual deformation of the under-rail pad, timely retightening is required. When sleeper voids, vertical or horizontal irregularities, or triangular depressions are found, track lifting and tamping should be carried out promptly. If minor vertical or horizontal irregularities cannot be corrected by track lifting and tamping, height-adjusting pads may be inserted. These pads should be placed under the under-rail pad, with a maximum of two pads and a total thickness not exceeding 10mm, to prevent excessive eccentric force on the screws.

(2) Any damaged fastener components should be replaced immediately upon discovery.

(3) All height-adjusting pads must be removed before performing track lifting and tamping operations with large-scale track maintenance machinery.

(4) When removing spiral spikes, prevent dirt and sand from contaminating the spikes or entering the pre-embedded sleeves.

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