Transmission tower foundation construction in Korea means selecting a foundation suited to the terrain, building it, and installing the safety facilities needed before the tower is assembled. Towers often stand in mountains, farmland or rock, so transport planning and site preparation matter as much as foundation quality. This guide covers three stages — material transport, foundation work and safety installations.
Contents
- Common Pre-Work Review
- 1. Material Transport
- 2. Foundation Construction
- Tower Foundation Types and QC Points
- 3. Safety Installations
- FAQ
- Reference Standards
- Summary
Common Pre-Work Review
Before work, review the design documents, the tower manufacturer’s drawings, the construction specifications and KEPCO design standards and field manuals, and prepare a method statement before work starts that is briefed to everyone involved. Prepare an earth resistance tester, utility locator, coating thickness gauge, survey instruments, total station, staff, level, tension meter, torque meter and hydraulic gauge, and plant such as mobile cranes, tower cranes, gin poles, excavators, forklifts and winches. Safety equipment includes gas detectors, site partitions, guidance signs, fall-prevention nets and fences, hard hats, safety vests, insulating gloves, safety shoes and harnesses.
1. Material Transport
- Considering tower size and height, total plant and materials, access routes, community concerns and cost, set up the site office and laydown yard to suit the terrain.
- Review the design documents to identify the temporary access route between the site office and tower site, and prepare a transport plan.
- Decide how plant and materials will be moved — road, cableway or helicopter — considering equipment weight, complaints, mountain terrain, farmland and cost.
- Set up temporary facilities such as laydown areas, environmental facilities and site safety facilities.
- Protect materials during storage and transport.
2. Foundation Construction
- Carry out setting-out surveys to secure the tower site and work area, and confirm permits and landowner consent.
- Prepare a construction quality assurance plan covering materials, plant, labor, schedule, quality and safety.
- In mountains, farmland or rock, secure enough area for the foundation work considering access roads and crop damage.
- Install temporary facilities needed for the foundation work — safety and environmental facilities and temporary spoil areas.
- Control excavation to avoid over-digging.
- Set the stubs (각입) using the tower geometry sheet (거부도) for position, face direction, perpendicular direction and slope, and check before and after concreting that the values are within KEPCO tolerances.
- Cut and fix reinforcement according to the bar bending schedule.
- Compact concrete thoroughly, observe the curing period to reach the design strength, and record and keep test results.
- Restore the disturbed area to the permit conditions and site needs through backfilling, cutting, filling and retaining walls.
- Install earthing during excavation taking soil resistivity into account, and measure earth resistance.
Inverted-T foundations proceed in the order excavation → shoring → stub setting → reinforcement → formwork → concrete. Inverted-T and special foundations (deep, caisson, pile and monopole) are quality-controlled by trade using workmanship checklists. Take concrete samples before placing for slump and strength tests.
Tower Foundation Types and QC Points
| Type | Characteristics | Quality control point |
|---|---|---|
| Inverted-T | Common spread footing | Follow excavation → shoring → stub → rebar → formwork → concrete |
| Deep (shaft) | All four legs on circular foundations | Trade-by-trade QC with workmanship checklists |
| Caisson (well) | One or more well-type foundations | Trade-by-trade QC with workmanship checklists |
| Cast-in-place pile | Bored with RCD rig, cage inserted, concrete placed | Prevent defects along the pile during placing |
| Steel pipe pile | Steel pipe piles as foundation | Dynamic load test for capacity; UT test on welded joints |
| Monopole | Single-pole type for very tight sites | Assemble in ground and tower crews; take care when aligning bolts |
Terms: stub setting (각입) is surveying level differences, distances and angles to position the stubs; the tower geometry sheet (거부도) is the dimensional calculation sheet used for tower assembly.
3. Safety Installations
- Prepare safety equipment to keep the site safe.
- Install safety facilities to prevent injuries from falling tools, tower members, fittings, bolts and nuts.
- Install vertical and horizontal safety lines on the main legs, bracing and arms to prevent falls.
- Check safety lines, fall-prevention facilities and equipment frequently, and replace anything damaged or substandard immediately.
FAQ
What is stub setting in tower foundation work?
Surveying level differences, distances and horizontal angles to set each stub’s position, direction and slope from the tower geometry sheet, then checking before and after concreting that values are within tolerance.
Which tests apply to steel pipe pile foundations?
Pile capacity is confirmed with a dynamic load test, and welded joints with ultrasonic testing (UT).
How is the disturbed site restored after foundation work?
According to the permit conditions and site needs, through backfilling, cutting, filling and retaining walls.
Reference Standards
- Electricity Business Act (전기사업법) — law.go.kr
- Electrical Safety Management Act (전기안전관리법) — law.go.kr
- Electric Technology Management Act (전력기술관리법) — law.go.kr
- Electrical Construction Business Act (전기공사업법) — law.go.kr
- Occupational Safety and Health Act (산업안전보건법) — law.go.kr
- Korea Electro-technical Code (KEC, 한국전기설비규정) — law.go.kr
- KEPCO design standards; field practice manuals for transmission and distribution work; Korean Industrial Standards (KS)
- NCS competency unit Transmission Tower Foundation Construction (철탑기초공사, 1901070215_22v4; NCS is Korea’s National Competency Standards) — ncs.go.kr
Summary
The most common mistakes in tower foundation construction are over-excavation and stub-setting errors discovered only after concreting. Transport depends on access routes and methods, foundations on stub values and concrete strength, and safety on checking fall and dropped-object protection. Assembly is covered in Transmission Tower Erection. For pre-construction preparation, see Transmission Line Construction Planning. A Korean version of this guide is available here.
This article restructures the Korean NCS competency unit ‘Transmission Tower Foundation Construction’ (철탑기초공사, code 1901070215_22v4) as a practical reference. Actual work must follow applicable standards and the judgment of qualified professionals; always confirm specific values, deadlines and criteria against the latest regulations and client standards.
Written/reviewed by VOLT · Last updated 2026-10-25