Heavy Load 4 Legged Angular Steel Galvanized Self Supporting Outdoor 20 28 36 44m 5g 4G WiFi Multi Antenna Telecom Tower

Product Description

JIAYAO CO.,LTD.

Product Description

Packaging Details: Telecom tower will be bundled by Galvanized strapping as per client's requirements.
Deliver:Shipped in 20 days after payment from Tianjin port
Tower members: One steel tower is separated into several bundles.
Bolts: Pacrum.lon bag or steel 

Design
1. Design Code	TIA/EIA-222-G/F
Structure Steel
2. Grade	Mild Steel	High Tensile Steel
	GB/T 700:Q235B, Q235C,Q235D	GB/T1591:Q345B, Q345C,Q3455D
	ASTM A36	ASTM A572 Gr50
	EN10025: S235JR, S235J0,S235J2	EN10025: S355JR, S355J0,S355J2
3. Design Wind Speed	Up to 250 km/h
4. Allowable deflection	0.5 ~1.0 degree @ operational speed
5. Tension strength (Mpa)	360~510	470~630
6. Yield strength (t≤16mm) (Mpa)	235	355
7. Elongation (%)	20	24
8. Impact strength KV (J)	27(20°C)---Q235B(S235JR)	27(20°C)---Q345B(S355JR)
	27(0°C)---Q235C(S235J0)	27(0°C)---Q345C(S355J0)
	27(-20°C)---Q235D(S235J2)	27(-20°C)---Q345D(S355J2)
Bolts & Nuts
9. Grade	Grade 4.8, 6.8, 8.8
10. Standards for mechanical properties
10.1 Bolts	ISO 898-1
10.2 Nuts	ISO 898-2
10.3 Washers	ISO 6507-1
11. Standards for Dimensions
11.1 Bolts	DIN7990, DIN931, DIN933
11.2 Nuts	ISO4032, ISO4034
11.3 Washers	DIN7989, DIN127B, ISO7091
Welding
12. Method	CO2 Shielded Arc Welding & Submerged Arc Welding(SAW)
13. Standard	AWS D1.1
Marking
14. Method of marking of the members	Hydraulic Press Stamping
Galvanizing
15. Galvanization standard of steel sections	ISO 1461 or ASTM A123
16. Galvanization standard of bolts and nuts	ISO 1461 or ASTM A153
Test
17. Factory test	Tensile test,Elements analysis, Sharpy test(impact test), Cold Bending, Preece test,Hammer test

What is the lattcie structure of 4 legged angular steel tower?
The lattice structure of a 4-legged angular steel tower is a crisscross, truss-like framework that connects the tower's four vertical angle steel legs. Composed of interconnected steel members (typically angular steel or lattice bars), it forms a web-like pattern that distributes loads-including the tower's own weight, equipment weight, wind, seismic forces, and ice loads-evenly across all four legs. This structure is integrated throughout the tower's height, complementing the tower's tapered design (wider at the base, narrower at the top) to enhance structural integrity and stability. The lattice configuration balances high strength with lightweight performance, minimizing material usage while maximizing load-bearing capacity and resistance to extreme environmental conditions. It also facilitates airflow, reducing wind resistance and further improving the tower's overall stability.


How to mount the MW dish on the 4 legged angular steel tower?
Mounting a microwave (MW) dish on a 4-legged angular steel tower follows a systematic, safety-compliant process:

1. Pre-installation Preparation: Verify the tower's load-bearing capacity to ensure it can support the MW dish's weight (including the dish, mounting bracket, and associated hardware). Check that the tower's design complies with relevant standards (e.g., TIA/EIA-222-G/F) for equipment mounting.
2. Bracket Installation: Attach dedicated antenna/microwave brackets (provided with the tower or custom-fabricated) to pre-designated mounting points on the tower's body or equipment platform. These brackets are secured using high-strength bolts (complying with ISO 898 grade 6.8/8.8) to ensure a firm connection to the lattice structure or tower legs.
3. Dish Lifting and Positioning: Use cranes or specialized lifting equipment to hoist the MW dish to the target height (typically on the upper sections of the tower or a dedicated equipment platform). Ensure the dish is aligned with the intended point-to-point communication path (adjust for azimuth and elevation as required).
4. Securing the Dish: Fasten the MW dish to the pre-installed brackets using compatible hardware, tightening bolts to the specified torque with calibrated tools. Ensure the dish is level and stable, with no wobble or movement.
5. Cable Routing and Integration: Route the dish's signal cables through the tower's integrated cable trays to protect them from environmental damage. Connect the cables to the appropriate equipment (e.g., transmitters/receivers) at the tower base or intermediate platform, ensuring proper insulation and waterproofing.
6. Final Inspection: Conduct a visual check to confirm the dish is securely mounted, brackets are intact, and cables are properly organized. Test the dish's signal transmission to verify alignment and functionality, adhering to safety protocols throughout the process.

What is the main structure of 4 legged angular steel tower?
The main structure of a 4-legged angular steel tower is a self-supporting framework designed for stability and load-bearing, consisting of three core components:

• Four Vertical Angle Steel Legs: The primary load-bearing elements, made of high-quality structural steel (e.g., Q235B, Q345B, Q420; compliant with ASTM A36/A572) and arranged in a square base configuration. These legs transfer the tower's total weight (including equipment and environmental loads) to the foundation.
• Lattice Truss Connections: Crisscross steel members (angular steel or lattice bars) that link the four legs horizontally and diagonally. This truss system distributes loads evenly across the structure, enhances rigidity, and resists lateral forces (wind, seismic activity), forming the tower's characteristic lattice pattern.
• Tapered Frame Design: The tower narrows gradually from the base to the top (wider at the bottom, narrower at the top), optimizing structural integrity by concentrating material where loads are heaviest (at the base) and reducing wind resistance at higher elevations.

Supplementary structural elements (e.g., equipment platforms, climbing ladders, and cable trays) are integrated into the main framework to support practical functionality, but the four vertical legs and lattice truss connections form the tower's structural backbone.

 
Platform,ladder of 4 legged angular steel tower

A. Platform

• Purpose: Serves as an elevated, stable workspace for installing, maintaining, or inspecting equipment (e.g., MW dishes, 5G antennas, surveillance devices) and tower components. It also provides a safe resting point for workers during climbing.
• Design Features: Typically made of galvanized steel (complying with ASTM A123/ISO 1461 for corrosion resistance) and integrated into the tower's lattice structure at specified heights. Platforms may include safety railings, non-slip surfaces, and access hatches to ensure worker safety. They are engineered to support the weight of workers, tools, and equipment, aligning with the tower's overall load-bearing capacity.
• Customization: Can be added at multiple heights based on project needs (e.g., near antenna mounting points or mid-tower for maintenance).

B. Ladder

• Purpose: A dedicated safety access system that allows workers to climb the tower to reach platforms, equipment, or upper sections for installation, inspection, or repairs.
• Design Features: Constructed from galvanized steel for durability and corrosion resistance, with evenly spaced rungs (per industry safety standards) for comfortable climbing. Key safety features include handrails, fall-arrest systems (e.g., cable guides for harnesses), and sometimes cage enclosures to prevent falls. The ladder is attached vertically to the tower's legs or lattice truss, ensuring a secure, stable path.
• Compliance: Designed in line with safety regulations and industry standards (e.g., TIA/EIA-222-G/F), prioritizing worker protection during vertical access.

Together, the platform and ladder enhance the tower's usability by enabling safe, efficient access to high-altitude equipment and components, supporting ongoing operation and maintenance.

Galvanizing angular steel tower testing

Galvanizing is a vital surface treatment for 4-legged angular steel lattice towers, providing long-term corrosion resistance to withstand harsh outdoor conditions and extend the tower's service life beyond 20 years. Below is a simplified overview of its galvanizing testing:

1. Core Testing Objectives

• Ensure sufficient coating thickness for durable corrosion protection.
• Verify zinc coating uniformity and strong adhesion (prevent peeling/flaking).
• Check for no critical defects (e.g., bare steel, cracks, pits).
• Comply with international standards (ASTM A123, ISO 1461).

2. Key Testing Methods (Conducted post-factory and post-installation)

• Coating Thickness: Use magnetic thickness gauges (non-destructive) or micrometers (sample-only destructive); minimum 85-120 μm (thicker for harsh environments).
• Adhesion: Bend test (180°), hammer test, or knife cross-hatch test-no coating detachment allowed.
• Visual Inspection: Check for bare steel, cracks, uneven zinc buildup, or contamination; minor irregularities are acceptable if non-impacting.
• Corrosion Resistance: Salt spray test (ASTM B117/ISO 9227) for 100-500 hours (resist red rust); optional long-term field exposure.
• Optional Chemical Analysis: AAS/XRF to confirm ≥98% zinc purity and detect impurities.

3. Compliance Standards

Adhere to ASTM (A123, B117, A572), ISO (1461, 9227, 898), tower design codes (TIA/EIA-222-G/F), and local regulations.

4. Post-Installation Spot-Checks

• Re-measure thickness at critical joints.
• Inspect for damage (scratches, dents) and touch up with zinc-rich paint if needed.
• Verify coating integrity at bolt holes and high-wear areas.

This testing ensures the galvanized coating's reliability, supporting the tower's performance in infrastructure applications.

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