Basic Info.
Product Description
Lattice structure tower
A lattice tower is a steel structure used on transmission and distribution overhead lines. The main purpose of these structures is the transport of the energy from the production plants to the consumption areas.
These structures are mainly manufactured in L profiles, but there are also some solutions in CHS profiles or other profiles like for example U/H profiles. The connections are mostly bolted connections, but there may also be welded connections.
The design and material types of a lattice tower are linked to the transferred load from cables to the structure and the operation voltage. The line voltage can be from 15kV up to 420kV and the loads are designed taking in consideration the span, angle line, type of cable and climate conditions of the location. There are several tower configurations, but the most common are alignment, angle, reinforcement, and dead end.
A lattice tower is a freestanding framework tower. They can be used as a radio tower (a self-radiating tower or as a carrier for aerials) or as an observation tower. 3 Legged Tubular Steel Tower is a self-supporting high-rise steel structure. Main features: 3 Legged Tubular Steel Tower is made of steel pipe, and the body has a triangular cross section.
Features:
- The steel pipe is used as the column material, the wind load coefficient is small, and the wind resistance is strong.
- The tower column is connected by an outer flange,
- The tower is arranged in a triangular shape to save steel.
- The roots are small, the land resources are saved, and the site selection is convenient.
- The tower body is light in weight,
- Truss structure design, convenient transportation and installation, and short construction period.
The materials and fabrication of our Transmission Structures comply with welding standards and user requirements.
Steel Pipe/Angle/Hybrid Tower Welding Requirements
1 ) We used CO2 welding and submerged arc auto welding or other methods.
2 ) Welded seam shall be full penetration and grinded.
3 ) The welded product has no fissure, scar, overlap, layer or other defects.
Our products are highly resistant to heat, moisture, humidity, and water.
And special processes are adopted in its production process to ensure its high precision, good quality and competitive advantage. We can accept product type damage testing to ensure the high safety factor of our products.
| Height | According to customer needs |
| Voltage Class | 10-1000kV |
| Tower Type | Self-suspension |
| Structure | Overlap Connection, bolt connection, |
| Material | Q345B/A572, minimum yield strength >=345MPA; Q235B/A36, minimum yield strength>=235MPA Or according to the standards provided by the customer |
| Details & Shape | Can be designed as per customer's requirement |
| Earthquake resistance | Grade 8 |
| Ice wrapping | 5-10 mm |
| Verticality | 1 / 1000 |
| Barks | Hot Dip Galvanization or Painted |
| Delivery Time | According to customer requirements |
| Galvanizing Standard | EN ISO 1461,ASTM/A123 or equivalent |
| Suitable temperature | - 45°C -+ 45°C |
| Service life | 50Years |
| Manufacturing and Workmanship | BS449 or AISC or equivalent |
| Welding Standard | AWS D1.1, AS554, AS 4100 standard or equivalent |
| Nuts& Bolts | Grade 8.8 |
| Spare parts | Provide additional tower and bolt spare parts according to order value |
Transmission Structures can be produced according to buyer's requirements; the specification can also be adjusted according to buyer's requirements by our engineers. In addition the antenna stand and platform can be installed in any position as buyer's request. The quantity of them is also fluctuant due to different clients.
Transporting materials to the tower sites and site preparation
The materials for construction needed for each tower are brought to site and distributed along the right-of-way where the towers will be built. Smaller poles are placed between the towers to support the transmission cables.
After completing site surveys, flagging and placing a call to BC One Call, the crews carefully remove the topsoil, and any necessary tree removal and brushing. Access roads are built so construction vehicles and equipment can travel to the site.
Building the foundations and anchors
Different types of foundations may be used to support the towers, depending on the soil type, depth of bedrock, and structure type. Excavation may be done with a mechanical excavator, hydrovac, auger, or hand digging.
Assembling the towers
Towers are generally built from the ground up. Line workers assemble the towers on the ground near the tower location - much like a giant, complicated 3D puzzle. This includes the use of heavy machinery. In areas that have soft ground composition, access mats (sometimes called rig mats) may be used to provide passage over the sensitive ground. Access mats provide structural support for equipment by dispersing weight and providing a solid base.
Raising the towers and poles
Tower sections are either assembled all in one piece, or in multiple pieces that are connected after they are raised. Telescopic cranes or helicopters are used to raise the tower sections from the ground, and bolt them together to complete assembly.
Poles are used to support cables between transmission towers and to maintain the tension of the cable. Framing and hardwire installation will be completed before the poles are installed, then lifted and set into place.
Our company accepts producing with supplied drawings and also can design drawings for you as your request.