220 KVA Electrical Pilon

Structural Design

Design Engineering (as “Wilkie”) was approached by the sports master of the Armadale Christian College to convert a 220 kVA electrical pylon into an abseiling tower.

Design first checked the materials that were available and took measurements. The tower was approximately 15 m tall. Compressed fibre sheets were selected to cover the steel tower. The footings were a combination of 2m square x 0.5m deep pad and anchor bolts drilled in lateritic rock for each column to reduce the required blasting which with a traditional footing required a depth of 2.2m and 2.6m square excavation of rock. Three separate abseiling walls of varying heights were designed and constructed around the tower for the varying abseiling skill levels with a platform at 9m, 17m & 29m.

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Project Brief

Outcome

  • Completed on time and on budget
  • Local children do not have to travel far in order to use an abseiling tower

Background

Design was approached by the Armadale Christian College to create an abseiling tower. At the time children had to travel long distances if they wanted to use such a facility and there had been requests from the community to have a local one installed. The abseiling tower was to be converted from a 220 kVA Western Power electrical pylon.

Project Objectives

The objective was to design a climbing wall / abseiling tower for local
children to play on, so they did not have to travel far to use other climbing
towers.

Challenges

The foundations of the tower were rocky. Therefore lots of blasting would be required to create traditional footings. The surface of the abseiling tower could also create wind loading challenges as the tower was not designed to have a covering or additional framework applied.

Our Approach

Design first checked the materials that were available and took measurements. The tower was approximately 15m tall. Compressed fibre sheets were selected to cover the steel tower. The footings were a combination of 2m square x 0.5m deep pad and anchor bolts drilled in lateritic rock for each column to reduce the required blasting which with a traditional footing required a depth of 2.2m and 2.6m square excavation of rock. Three separate abseiling walls of varying heights were designed and constructed around the tower for the varying abseiling skill levels with platforms at 9m, 17m and 29m.