The seven stages
| Stage | What happens | What controls the duration |
|---|---|---|
| 1 · Survey | Drone photogrammetry or laser scan of the face, block-size assessment, geological mapping (Slope survey: drone photogrammetry and laser scanning) | Access for the survey team; usually days, not weeks |
| 2 · Design | Trajectory analysis on the surveyed profile, barrier line, height and class, anchor design and test plan (How to choose the energy class of a rockfall barrier) | Quality of the survey; client and consultant review cycles |
| 3 · Procurement | Certified system manufactured to order, shipped, cleared through customs, stored near site | Manufacturer lead time and shipping — the longest single stage; customs clearance and import documents |
| 4 · Mobilisation and preparation | Crews, drilling equipment, rope-access set-up, traffic management, helicopter contract where needed | Helicopter availability; permits for lane closures; summer heat limiting shift length |
| 5 · Scaling | Loose rock brought down from the face before any component is fixed (Slope and rock scaling: methods, measurement first, acceptance) | How much loose rock the survey found; whether the road can be closed for it |
| 6 · Anchoring and erection | Anchor drilling and grouting, post foundations, posts, ropes, brake elements, nets | Rock quality (drilling rate), access to each post, weather; grout curing before loading |
| 7 · Testing and handover | Pull-out tests on the stated share of anchors, as-built survey, inspection schedule and maintenance manual (Anchor and rock bolt pull-out testing on site) | Test count in the specification; witnessing by the engineer |
The six factors that set the pace
- Access. A truck at the toe, rope access, or helicopter — the same line can take a different number of weeks depending only on this.
- Rock. Drilling rate in fractured limestone or ophiolite, and how many anchors each post needs, set the critical path of stage 6.
- Heat. Between May and September, shifts on an exposed face are shorter; heavy work in Oman is programmed for October to April where the client's schedule allows (see our region pages).
- Traffic. A road that stays open works in windows: lifts and scaling wait for lane closures, often at night.
- Lead time. Certified systems are not stock items; ordering early, right after design approval, removes the longest wait from the critical path.
- Decisions. Approval cycles for the design report and for variations are the delays no contractor controls — a named decision-maker on the client side shortens the programme more than any crew.
What a realistic programme looks like
We do not publish standard durations, because a duration without the six factors above would be a guess. What we do is name each factor in the programme submitted with the bid, show which stages overlap — procurement runs while mobilisation and scaling proceed — and state the assumptions on access, weather and traffic that the dates depend on. On the Khasab–Tibat coastal road, barrier lines of about 1.5 km in the 5,000 and 2,000 kJ classes were installed by helicopter and rope access with the road kept in use; the record of that scope is published as a project record.
Questions on this topic
Can the road stay open during the works?
Usually yes. Scaling and helicopter lifts need short closures; anchoring and netting proceed under traffic management. The working windows are agreed with the road authority before mobilisation and written into the programme.
What is the best season for installation in Oman?
October to April for heavy work on exposed faces. Summer work is possible with shorter shifts and earlier starts; in Dhofar the khareef (June to September) adds rain, fog and slippery rock.
How quickly can you be on site?
For a site visit on the Batinah, within days from Sohar; elsewhere in the Sultanate, within the week. Installation follows design approval and the system's delivery.
Sources
- EAD 340059-00-0106 (falling rock protection kits); EN 1537 and EN 14490 for anchor execution and testing.
- Artusa project record, Khasab–Tibat coastal road (Musandam), 2018–2019 — https://artusaoman.com/projects/khasab-tibat-coastal-road/