Tianjin Railway Cement Protection Fence Quotation Tanggu High-Speed Concrete 1.8m Subgrade Barrier Manufacturer

Railway Protective Fence - Utilizing Technical Standards

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

2.2 Metal mesh panels are designed for a lifespan of 15 years.

3. Railway Protection Fence Technical Requirements

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

3.2 Stake Posts

Pillars are prefabricated with C30 reinforced concrete, with a cross-sectional size of 120mm x 120mm and a height of 2.2 meters. During prefabrication, a square hole measuring 42mm x 42mm with a depth of 150mm is left in the center of the top. Upon on-site installation, a Q235 square tube with a connecting plate and a sealed end is inserted into the hole, and half-filled with water-sealing material to fill the gaps. The square tube specifications are 40mm x 40mm with a thickness of 2.5mm. The rectangular tube is inserted to a length of 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, size 30mm*50mm, with tube thickness of 2.0mm; the internal wires are made of HPB300 6.5mm high-strength steel wire cold drawn, size 75mm*150mm (diameter 4.0mm), with a 30° outward fold at the top, and a vertical height of 300mm.

3.4 Connector plate and bolts.

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

Precision requirements for the connector plate: Length tolerance ≤ 1.0mm, width tolerance ≤ 0.5mm, thickness tolerance ≤ 0.5mm, hole position deviation ≤ 1.0mm.

3.5 The metal mesh and grille door panels should be fully galvanized and then undergo hot-dip galvanizing (or spray painting) treatment after forming. The galvanizing amount should be 270g/m2, with a coating thickness of 0.8mm to 1.2mm, and the spray painting color should be dark green. The coating should be even, uniform in color, smooth on the surface, free of drips, lumps, powdery bubbles, and iron leakage defects.

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

Sheet flatness requirement: protrusion or indentation ≤ 5.0mm.

Cold drawn steel wire diameter tolerance before galvanizing ≤ 0.06mm. Welded 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 be done using resistance welding. If brazing is used, appropriate brazing rods should be selected to minimize deformation. After welding, slag should be cleaned. Deformation caused by welding should be flattened. To ensure sufficient strength of the wire mesh itself, the strength of the welding points should be greater than 1kN, and the number of welding points that fall off should be less than 4%.

Related Products: Railway Isolation Mesh, Reference Diagram for Railway Line Protection Fencing