Products Description
What is Railway Segment Bolt ?
The railway segment bolt used to repair the cement structure of the subway is called a subway bolt. It is widely used in mining and subway engineering. There are two types of metro bolts: longitudinal straight bolts and circumferential arc bolts. In some projects, the specifications of 2 types of bolts are the same, while in others, they have different specifications and strength grades. Metro bolts are also known as segment tunnel bolts. There are various designs and types of segment bolts based on the diameter of the shield.
Railway Segment Bolt Size Specifications
Main Metro Bolt Models
GNEE RAIL subway bolts mainly have three specifications of φ22×410, φ25×395, and φ28×556. The mechanical properties all meet the grade 8.8 in the ISO898-1:2009 standard. Among them, the surface of φ28×556 metro bolt is treated with natural color, and the other two specifications of the metro bolt are treated with a hot-dip galvanizing layer.
| Size | Grade | Material | Surface treament |
|---|---|---|---|
| φ22×410 | ISO898-1:2009 standard, grade 8.8 | 45# | Hot dip galvanized, thickness of zinc layer ≥43μm |
| φ25×395 | Hot dip galvanized, thickness of zinc layer ≥43μm | ||
| φ28×556 | Natural color |
Railway Segment Bolt Surface treatment：
Gnee Factory - Railroad Track Bolts Photos
Installation of Railway Segment Bolt
Installation of Tunnel Segment Bolts
The selection of tunnel segments in shield tunneling is based on fulfilling the requirements of the tunnel alignment. It is essential to consider that the gap between the shield tail and the tunnel segment after installation should meet the requirements for the next excavation cycle to ensure an adequate shield tail gap and prevent direct contact between the segment and the shield tail. Generally, the selection and installation positions of the segments should be determined in advance based on the pushing instructions, aiming to minimize the differential stroke of the jacks after segment installation.
Advantages of Gnee Railway Bolts
The anti-rust thickness of the segment bolts provided by Gnee Rail can be maintained for more than 50 years, with strong corrosion resistance and long service life. Our railway segment bolt products include straight segment bolts and curved segment bolts, and can provide customized services for surface treatment, material, appearance, etc. according to the drawings provided by customers.
Gnee provides segment bolts of M16-M80 size, made of high-quality stainless steel and alloy steel. They can be used in radial and circumferential joints, and play an important role in railway construction, especially tunnel construction.
About the Company
who choose us?
Our rail bolt products strictly implement international railway standards such as AREMA, EN, AS, UIC, etc., and have passed ISO9001 quality system certification to ensure that the products are stably and safely used in railway systems in different countries.
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