M24 M27 Tunnel Concrete Connecting Bolt

• Material: High Strength Steel
• Type: Square Head
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, ANSI, GB, BSW, GOST
• Grade: 8.8
• Model NO.: tunnel bolt
• Application: Railway Bolt
• Finish: Black
• Item Name: Rail Bolt
• Surface Finish: Plain, Black Oxide, HDG, etc
• Raw Material: 45#, 40cr, 42CrMo
• Manufacturer: Kunshan Signum Machinery Technology Co.,Ltd
• Hardness: HRC37-44
• Transport Package: Woven Bag, Fumigation Free Pallet
• Specification: Rail Bolt
• Trademark: SIGNUM
• Origin: Jiangsu
• HS Code: 7318151001
• Production Capacity: 150000pieces/Month

Product Description

M24 M27 Tunnel Concrete Connecting Bolt

Product Description

Metro Bolt for Segment Tunnel
What is Metro Bolt for Segment Tunnel?
Metro bolts used to repair the cement structure of the subway are called subway bolts. They are 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 also have another name. They are called segment tunnel bolts. There are various designs and types of segment bolts based on the diameter of the shield.

 

Arc-shaped segment tunnel bolt
Arc-shaped segment tunnel bolts are used to connect and fasten segments. These segments are assembled into a circular cylindrical pipeline, where the segments form the cylindrical walls. During excavation, arc-shaped segment bolts effectively control ground settlement, reduce the impact on above-ground structures, and ensure that underwater excavation does not affect surface traffic. Each segment is combined to form a pipeline, designed as straight or arc-shaped fastening connectors, which are called arc-shaped segment tunnel bolts.

Metro Segment Bolts Classification
Metro segment connection bolts have a wide range of applications, including building segment connections, shallow-buried longitudinal segment bolts, subway shield construction, subway segment connections, tunnel segment connections, and other projects requiring connection and fastening. Generally, segment connection bolts can be classified into 6 types: hexagonal head arc-shaped segment bolts, non-standard segment bolts, double-ended straight segment bolts, double-ended arc-shaped segment bolts, hexagonal flange face arc thread segment bolts, and hexagonal head arc thread segment bolts. Additionally, segment connection bolts can be classified based on the applied forces, typically categorized into three levels: 5.8 grade (material using Q235), 6.8 grade (material using 45#), and 8.8 grade (material using 40Cr). Zinc plating is commonly used for surface treatment.

Detailed Photos

 

We can make GB standard railway bolt with different designs as per different standards such as UIC864-2,UIC,GB,BS,DIN,GOST or ISO, with grade 5.6, grade 8.8, grade 10.9 and grade 12.9, including American Standard grade 5 and grade 8, with diameter from 14mm and 36mm.

 

Product Parameters

Tunnel bolt, High tensile square head bolt, and other special shape bolts are also available.

SIZE	M24, M27, M30 ,  Customized
CLASS(Carbon steel)	10.9 , Customized
Coating(Carbon steel)	black, zinc, HDG, Heat treatment, Dacromet, GEOMET
MATERIAL	Carbon steel,Customized
PACKING	bulk/ boxes in cartons, bulk in poly-bags/ buckets, etc.
PALLET	solid wood pallet, plywood pallet, ton box/bag, etc.

 

Certifications

Company Profile