Tower Assembly, Erection and Dismantling Procedures
Erection and dismantling are the highest-risk phases of a tower's life. Candidates must know the sequence: pre-assembly inspection of components, verification of the manufacturer's manual and configuration, foundation or base preparation, then progressive erection with stability maintained at every stage. The principle is that the structure is never left in an unstable intermediate state - either it is tied, ballasted, or guyed as the manual requires, or it is not left standing.
Traps in questions cluster around sequence and authority. Dismantling is not erection in reverse by default; the manual specifies the order, and removing ties or ballast too early is a recognised cause of collapse. Another trap is mixing components from different manufacturers or using non-standard pins and clips - questions may describe a "temporary" substitution that seems pragmatic but is prohibited without engineering approval.
Personnel competence matters: erection should be supervised by a competent person, and where the tower is a work platform, the assembler must be protected against falls during the build, often by starting from a safe platform and adding guardrails progressively. Weather limits - particularly wind speed during lifting of sections - must be observed, and the manual's figure governs.
Rule of thumb: never remove a stability element until the element that replaces it is fully fixed and checked. Worked example: dismantling a tied tower - remove the platform section only after the tie below it is confirmed sound, and never release the tie above an unsecured section.