336.1 Benchmarks & datums

Establish stable datums tied to survey control (612). Benchmarks keep HVM bollard heights consistent (312).

Start by fixing a primary vertical datum and at least one redundant check point. Tie both to the site’s control network using a total station and a verified datum. Record coordinates and elevations in the survey log so downstream trades can reference identical numbers, preventing gap drift during works.

Adopt resilient physical marks: stainless studs in paving, paint on kerbs protected by caps, or fixed pins in concrete. Cross-check these against 612 — Setting-Out & Benchmarks and log any relocation in the 718 — Change Log.

336.2 Gridlines & offsets

Set centerlines and offsets from facades/kerbs (234). Clear grids speed installation and protect crash rated bollard spacing (232).

Lay out a simple, readable grid: one array centreline for each row, plus offsets from the 234 — frontage line and back-of-kerb. Use stencils or chalk lines with station marks every 0.5–1.0 m to make measurement repeatable. Confirm the grid respects 232 — Spacing rules and any 231 — egress widths.

For doors and glazing, apply near-door clear-gap targets and the 322 — Clear-Gap Calculations method. Where geometry is tight, reference 323 — Frontage/Door Arrays.

336.3 Templates & jigs

Use drilling/anchor jigs and spacing frames. Jigs standardize HVM bollard centers and plumb.

Prefabricated steel or aluminium templates reduce cumulative measuring error and speed repetitive tasks. Include holes for anchor patterns, centre marks for cores, and cut-outs for induction loops to avoid clashes. Label the jig with the correct product family and anchor geometry to maintain 421 — rating-critical dependencies.

Use a leveled jig or a bubble/laser add-on to set plumb. For slab-mounted plates, a Go/No-Go gauge ensures hole spacing and slot length meet the tolerance band before drilling. See also 315 — Tolerances & Manufacturability.

336.4 Tolerance bands

Define ± for centers, levels, rotation (315). Bands reflect deflection/set margins (314) for any crash rated bollard.

Specify numbers that are tight enough to preserve security but realistic for site work. Typical starting points (refine per project): centre-to-centre ±5 mm; rotation ±1.0°; top-of-bollard level ±3 mm over an array; plate flatness ±2 mm. These bands should be derived from the model’s dynamic deflection and permanent set (see 314) and the acceptance 626 criteria.

Publish the tolerance table in the ITP (714) and repeat it on set-out drawings (931) so crews and inspectors use the same pass/fail thresholds.

336.5 Height/level control

Check levels before/after pour (626). Control ensures HVM bollard effective height stays within spec (312).

Measure proposed finished floor level (FFL) and crossfall, then set socket or baseplate levels to deliver the required effective height per 312 — Height setting. For poured foundations, take a pre-pour check, a mid-pour spot check on the first two units, and a final check after trowel.

Consider settlement of reinstated surfaces (629) and specify allowable differential level between adjacent bollards. Where drainage falls through the array are unavoidable, recalc 322 — projected gaps at the low side.

336.6 Survey check cycles

Initial, mid-pour, and pre-handback cycles catch drift. Cycles produce evidence for SAT (638) and handover (731).

Use a simple three-cycle plan: (a) pre-works verification of control points and first-principles check against drawings; (b) in-process checks after the first two foundations and then per lift/segment; (c) final array verification before 638 — SAT. Log each cycle with photos and CSV exports.

For automatic systems, coordinate with 344 — Induction Loops and 353 — Safety Signalling to avoid cable clashes and to keep detector positions survey-traceable.

336.7 Recording as-built

Capture points, levels, photos (716). As-builts lock HVM bollard compliance and support crash rated bollard traceability (431).

Deliver a consistent set: (1) surveyed coordinates and levels for each bollard centre; (2) measured centre-to-centre spacing and edge clearances; (3) 716 — georeferenced photo log (wide→detail); (4) any approved deviations with reason and acceptance reference. Tie serial numbers to positions via the 732 — Asset Register.

Include certificate references (431) to preserve test comparability, and store files per 911 — File Index & Naming Rules.

336.8 Common errors

Misread grids, swapped centers, and unchecked jigs. Prevent with checklists (714) and peer checks (247).

Typical pitfalls include transposed digits in offsets, forgetting to switch jigs when the anchor pattern changes, and marking to face of bollard instead of centre. Use a two-person check for the first three positions each day and a quick step gauge to confirm height consistency. Capture a brief after-action review for any deviation so lessons carry forward.

• Wrong reference line: confirm the defend line and frontage line before marking.
• Uncontrolled rotation: use a rotation mark on jigs and check with a square/laser.
• Missing loop clearance: pre-mark loop lanes (929 — Loop Placement Helper).

336.9 Handover of set-out data

Deliver CSV/DWG with metadata (931). Clean data accelerates O&M and future upgrades (446).

Package a Survey Deliverables Pack: a master CSV (ID, X, Y, Z, rotation, centre-to-centre), DWG with layers per 931, a PDF key plan, and the 736 — Handover Index cross-references. If approvals apply, include a short reader guide and upload to the submission portal (see 938 — Submission-Pack Guidance).

336 Bollard Setting-Out — FAQ