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Height Adjustment Pad

The height adjustment pad for railway track structure is an important component in the track structure. When the rail has problems such as empty hanging or uneven height, it is necessary to insert a height adjustment pad for adjustment, which provides the necessary support for adjusting the height of the rail. The height adjustment pad is also called the height adjustment plate. It also plays an important role in the WJ-7 and WJ-8 fastener systems.

Height Adjustment Pad

Application of Height Adjustment Pad in WJ-7 and WJ-8 Rail Fastener System

At the early stage of railway operation, attention should be paid to observe the use of rails and fasteners. When the rails are found to be empty, or the height or level is irregular, the height adjustment plate should be inserted in time.

Application of Height Adjustment Pad

The height adjustment plate can be divided into height adjustment plate under rail track and height adjustment plate under tie plate according to different placement positions. Depending on the fastener system used, the shape and thickness of the height adjustment plate are also different.

Like the hot-selling HDPE plastic sleepers, the height adjustment pads produced by AGICO are also made of High Density Polyethylene (HDPE) as raw materials. High-density polyethylene is a high-quality polymer material with good chemical stability and mechanical strength. The height adjustment pad made of high-density polyethylene has good heat resistance and cold resistance, good rigidity and toughness, acid, alkali and various salts corrosion, long service life, suitable for use on railway lines under various harsh environment.
 

Material High Density Polyethylene (HDPE)
Density 0.94-0.96 g/cm3(tested according to DIN EN ISO 1183-1)
Melt Flow Rate (MFR 190/2.16) 3.1-18 g/10 min in accordance to DIN ISO 1133
Shore Hardness D approx. 65 Shore-D in accordance to DIN 53505
Volume Resistivity >10 to the 8th power Ohmcm(tested according to DIN IEC 60093 / DIN IEC 60167)
Surface Free of cracks and / or damages

Height Adjustment Pad Under Rail Track

Height Adjustment Pad Under Rail Track

The under-rail height adjustment pad is usually placed between the rubber pad and the railway tie plate. According to different thickness, the rail height adjustment plate can be divided into four types: 1mm, 2mm, 5mm and 8mm. It is suitable for scenes where the rail adjustment is less than 10mm. The height-adjusting pads can be stacked and used, and the total quantity should not exceed two. The lower-thickness lower-rail height adjustment pads should be placed on the lower layer during installation to prevent the height adjustment pads from escaping.

WJ-8B Type Fastener System Height Adjustment Configuration Table Ⅰ
Rail Adjustment Amount Total Thickness of Height Adjustment Pad Under Rail Track
1mm 1mm
2mm 2mm
3mm 1×2mm+1×1mm
4mm 2×2mm
5mm 1×5mm
6mm 1×5mm+1×1mm
7mm 1×5mm+1×2mm
8mm 1×8mm
9mm 1×8mm+1×1mm
10mm 1×8mm+1×2mm

Height Adjustment Pad Under Tie Plate

Height Adjustment Pad Under Tie Plate

The height adjustment pad under tie plate is placed between the elastic pad and the bearing surface of the sleeper or the track plate. When the rail height adjustment exceeds 10mm, the height adjustment pad under tie plate is often used in conjunction with the under-rail height adjustment pad, and the total thickness should not exceed 20mm.

Each pair of height adjustment pads is composed of two pieces, which are respectively inserted from the side. The height adjustment pad can only be used in a single layer, and cannot be superimposed. There are two specifications of 10mm and 20mm for the height adjustment pad of the WJ-8 type fastener system, and it also two specifications of 5mm and 10mm for the WJ-7 fastener system.

WJ-8B Type Fastener System Height Adjustment Configuration Table Ⅱ
Rail Adjustment Amount Total Thickness of Height Adjustment Pad Under Rail Track Total Thickness of Height Adjustment Pad Under Tie Plate
11mm 1mm 10mm
12mm 2mm 10mm
13mm 1×2mm+1×1mm 10mm
14mm 2×2mm 10mm
15mm 1×5mm 10mm
16mm 1×5mm+1×1mm 10mm
17mm 1×5mm+1×2mm 10mm
18mm 1×8mm 10mm
19mm 1×8mm+1×1mm 10mm
20mm 1×8mm+1×2mm 10mm
21mm~30mm The adjustment method is the same as above, the total number does not exceed 3 20mm

As a leader in the industry of railway fasteners, AGICO produces a wide range of railway accessories such as adjustable pads, rubber pads, elastic pads, railway insulation blocks, embedded dowels for various rail fastening systems. Customers in need are welcome to send us inquiries.


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