Langfang Railway Cement Protection Fence Price, Gu'an High-Speed Railway Concrete Subgrade Guardrail Manufacturer

Railway Protection Fence - Technical Standards Adopted

2.1 General Reference Diagram for Railway Engineering Construction (Railway Line Protection Fence) (Open Line (2012) 8001), (Bridge Under Protection Fence Open Line (2012) 8002).

2.2 The service life of the metal mesh panel is designed for 15 years.

3. Rail Protection Fence Technical Requirements

3.1 Reinforced concrete column metal mesh security fence consists of columns, mesh panels, and connecting parts, with a protective height of 1.8 meters.

3.2 Stake Piling

Pillars are prefabricated from C30 reinforced concrete with a cross-sectional size of 120mm x 120mm and a height of 2.2m. A 42mm x 42mm square hole, 150mm deep, is pre-drilled in the center of the top. During on-site installation, a 40mm x 40mm square tube with a connecting plate and sealed end is inserted, and half-filled with water-sealing material to fill the gaps. The tube specifications are 40mm x 40mm, with a thickness of 2.5mm. The tube is inserted 150mm, with the exposed portion bent outward at 30 degrees, and a vertical height of 300mm.

3.3 Metal Mesh Sheets

Metal mesh panels are constructed with Q235 rectangular tube frames, 30mm x 50mm in size, with a tube thickness of 2.0mm; the internal wires are made of HPB300 6.5mm high-tensile steel wire, cold drawn, 75mm x 150mm (diameter 4.0mm), with a 30° outward fold at the top, and a vertical height of 300mm.

3.4 Connector plate and bolts.

Column connecting plates and mesh connecting plates are made of 90° bent Q235 steel plates with a thickness of 4.0mm, available in three types: A, B, and C, depending on the usage location. Both the connecting plates and bolts are made of Q235 steel and zinc-plated, with a zinc coating of 270g/m².

Board connector precision requirements: Length deviation ≤ 1.0mm, width deviation ≤ 0.5mm, thickness deviation ≤ 0.5mm, hole position deviation ≤ 1.0mm.

3.5 The metal mesh panels for the grille gates should be galvanized as a whole after forming and then subjected to hot-dip plastic coating (or spray painting). The zinc coating should be 270g/m2, with a plastic coating thickness of 0.8mm to 1.2mm. The spray painting color should be dark green. The coating should be even, with consistent color, smooth surface, free of drips, lumps, powder bubbles, and iron leakage defects.

Mesh manufacturing precision requirements: Length tolerance ≤ 2.5mm, height tolerance ≤ 3.0mm.

Sheet flatness requirement: Elevation or depression ≤ 5.0mm.

Cold drawn steel wire diameter tolerance before galvanizing ≤0.06mm. Welded wire mesh tolerance ≤3.0mm.

When welding mesh connection plates, the welding position of the connection plate should be strictly controlled at the designed location, with the position error ≤ 1.5mm.

The welding of rectangular tube frames with connecting plates, wire mesh with steel plates, and wire mesh with rectangular tube frames should preferably be done using resistance welding. If brazing is used, suitable brazing rods should be chosen to minimize deformation. Welding slag should be cleaned after welding. The deformation caused by welding should be leveled. To ensure the sufficient strength of the wire mesh itself, the strength of the welding points should be greater than 1 kN, and the number of weld points that fall off should be less than 4%.

Related Products: Railway Isolation Fence, Reference Diagram for Railway Line Protection Fence