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An M25x140mm plastic dowel for a tunnel construction is a specific component used in the construction of tunnels, particularly in segment assembly. These specialized dowels are part of a system that connects precast concrete tunnel segments, ensuring proper alignment and stability during construction and throughout the tunnel's life. Normally, plastic dowels for a tunnel construction are needed to fasten concrete segments into rings during tunnel lining by TBM.
M24 x 150mm Plastic dowel for railway tunnels can be made of polyamide (PA) or HDPE which are based on the requirements’ requst.
Polyamide (PA) is a type of high-performance plastic. This material provides a key combination of high strength and durability, along with excellent resistance to chemical corrosion and abrasion.
Plastic dowels made of polyamide (PA), commonly known as nylon, are durable and wear-resistant. They have good performance on Density,Tensile strength,Bending Strength,Hardness,etc. The cost of plastic dowels made of polyamide is a littler higher than those made of HDPE.
Plastic dowels made of HDPE are cheaper than dowels made of polyamide. It can save cost. But their performance on Density,Tensile strength,Bending Strength and Hardness are not as good as plastic dowel made of polyamide. Nowdays, plastic dowels made of polyamide are more popular.
Key Characteristics and Function
Key Characteristics and Function
Dimensions: The "M25x140" designation provides the dowel's specific size, though it is not a standard metric-threaded fastener size. For tunnel dowels, the notation would refer to:
M25: Indicates a nominal diameter of 25 mm.
140: Indicates the length of 140 mm.
Purpose: Polyamide dowels are part of a larger coupling system that includes sockets, which are anchored into the concrete segments.
Alignment: They guide the precise alignment of adjacent tunnel segments as they are being installed.
Joint Stability: The dowels and sockets help to maintain the structural integrity of the joints between segments by transferring shear loads.
Non-corrosive: Unlike steel dowels, polyamide is not susceptible to rust, which is a critical consideration in moist underground environments.
Dowelock System: This patented system uses two plastics for self-aligning tunnel segments, ensuring accurate positioning and good shear resistance. It offers cost savings, quicker installation, and better segment alignment.
Tunnelock Circle Joint Connection: Made from high-strength plastic, this system combines bolted connection advantages with dowel speed and alignment. It's designed for fast ring erection and reduces lipping between segments.
Customized Special Fastener Tunnel Bolt with Plastic Dowel: These fasteners are available in bulk quantities, with prices decreasing for larger orders, making them a cost-effective option for specific tunnel applications.
Biblock Dowel System: This tough connection set ensures high shear and pull-out resistances, with low insertion forces for easy installation. It guarantees perfect alignment of segments and offers cost savings and quicker installation.
A polyamide dowel for a tunnel bolt is a plastic insert used in tunnel construction to connect tunnel segments and reinforce the structure. These dowels, often made of glass fiber-reinforced polyamide (PA6 or PA66), provide a secure fastening base for bolts and help insulate the components. Kunshan Signum Machinery Technology Co.,Ltd offer plastic dowels for railway tunnels according to clients’ requirements or drawings with competitive price.
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