Structural

Antenna Add-ons

SCOPE

ASEC worked on our client’s PCS program where antenna additions throughout the client’s systems were modeled and towers analyzed for strength and capacity requirements for the additional loads per governing client standards, GO 95 code and ANSI/TIA-122 Structural standards.

Project Description

Loads were generated using ASEC’s proprietary software using an overload factor of 1.5 on the original design loads. Tower member reinforcements were designed for the additional load as required and unloading procedures devised for the member replacements for a safe and reliable construction sequencing.

138kV Transmission Line Rebuild

Scope

ASEC’s client is rebuilding their existing 138kV transmission lines. The cell equipment on the existing structures is being transferred to new structures. The scope of the project is to develop new loads for the cellular antennas installed on the structure.

Project Description

Provided new cellular antenna loads for design of new tubular structures along with the conductor loads on the transmission line.

Overhaul-Rebuild and Fiber Addition

SCOPE

ASEC is supporting our client with this 26-mile project that consists of 17 miles of overhaul-rebuild and an additional 9 miles of OPGW Fiber addition to the existing transmission line structures. The existing H-frame line is being converted to delta-monopoles. 

Project Description

The rebuild structures are a combination of engineered concrete and steel poles. ASEC generated the loading tree calculations for these poles and reviewed the vendor calculations and fabrication drawings. The foundations have been designed by ASEC using a combination of direct-embedded with crushed rock and concrete backfills, and drilled pier shafts utilizing the anchor bolt cage design from the vendor. The geotechnical specifications were specified by ASEC and the soil parameters sifted from the boring reports while discussing foundation design concerns with the geotechnical engineer.
Software used – PLS-CADD, FAD Tools, PLS-CAISSON

Steel Pole Design

SCOPE

ASEC performed detailed design on a family of six tapered tubular engineered steel poles. The poles were designed for 345kV double circuit configurations with two shied wire positions. ASEC created load tree drawings, electrical clearance diagrams, steel weight estimates, and estimated foundation reactions to give our client an accurate design basis for cost-estimating purposes.

Project Description

The following six structures types were designed as art of this family – Tangent, Long-span tangent, 15° running angle, and 30°, 60° & 90° deadend structures. The point loads used to generate the load-tree drawings were created using a proprietary ASEC program. The structure heights for this family ranged from 150’ to 200’ and were limited by FAA restrictions.

River Crossing Tower Design

SCOPE

ASEC has been contracted to design two new river crossing towers and two new anchor deadend towers. The project includes designing the new river crossing towers over 600 ft tall and supporting all the associated detailing efforts.

Project Description

ASEC is currently at the mid-point of this design coordinating the efforts with the contractor and the client for the effective construction of a tower of this magnitude. The towers will have uneven leg Other tasks involved with this design which will be managed by ASEC include fabrication and construction support. Once designed and installed this will be one of the tallest transmission line towers in United States.

Lattice Tower Design

Scope

ASEC has been tasked to design a new lattice tower family for a client’s double circuit 345kV system.

Project Description

Four tower types, along with helicopter installation splicing schemes have been developed. The tower types include upto 250’ tall tangents, running angles, light deadend, and heavy deadends.

Lattice River Crossing Structure Design

SCOPE

Our client’s Illinois River Project (ILR) is a 330-mile transmission line which includes fourteen (14) lattice river crossing structures. ASEC’s scope included design of the tower family and providing owner’s engineering support for the development of the loading criteria for client, inspection of proof-of-fit assembly and monitoring construction activities.

Project Description

The fourteen (14) river crossing structures were erected across three river sections and included tangents and deadend anchor towers. The heights of the towers designed and installed ranged from 385’ to 460’

Owner’s Engineering

SCOPE

ASEC provided consulting engineering services as owner’s engineer for nearly two years throughout the duration of a 220kV double circuit tower family development through testing.

Project Description

Additional services provided included detailed design, detailing and manufacturing support.