Pump pressure is not tendon force. Link the actual jack and gauge to their valid calibration relationship and confirm that the reaction arrangement matches the test plan.
This reference material was written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site approval are necessary before field use.
Stop before proceeding
Stop loading for sudden pressure or movement changes, moving bearing assemblies, tendon damage or hydraulic defects. Clear the tendon axis and keep further stressing and excavation on hold.
AI-generated reference material; not professionally verified or approved. Before use, a qualified person must review and adapt it to applicable Singapore requirements, the actual equipment/site and approved safe work procedures.
1. Legal and technical scope
Singapore risk-management duties cover drilling, grouting and stored-energy stressing. Where the anchors form earth retaining or stabilising structures, coordinate with the project Qualified Person and applicable BCA requirements. The reviewed BCA advisory links site investigation, construction stages and monitoring to release of the next excavation stage. A successful individual anchor test does not release the whole support system.
| Basis | Singapore application |
|---|---|
| Risk management | The employer, self-employed person and principal assess and control work risks. Include preparation, abnormal conditions and maintenance. Coordinate affected trades and communicate controls. |
| Activity-specific guidance | Use the ERSS source for ground investigation and evidence-based stage release; use machinery guidance for rig guarding and control of hydraulic/mechanical energy. No engineering adequacy is certified. |
| Permits and authority | Select permit requirements for the actual sector and activity. Site hold points and contractor role labels do not create statutory permits or qualifications. |
| Equipment and design | The BCA material read is an advisory and selected construction-record forms, not a completed design or approval. Determine applicable current Building Control and WSH construction requirements with the project team. Test increments, durations, creep limits, lock-off loads and recovery arrangements must come from the approved design and equipment instructions. |
2. Scope and required inputs
Included scope
Drill, install tendons, grout, verify curing, test, stress and lock off ground anchors, then hand over the excavation stage.
Separate assessment
Anchor design, bond-length selection, test-load specification, redesign of failed anchors and removal of existing anchors require separate engineered procedures.
| Input | Evidence needed |
|---|---|
| Confirm design | Utility clearances; Anchor drawing; Ground information; Acceptance criteria. |
| Drill bore | Rod handling isolation; Depth and angle; Water and strata; Bore condition. |
| Prepare test | Curing evidence; Equipment IDs; Calibration relationship; Reaction condition. |
| Stage handoff | Anchor ID and result; Lock-off protection; Monitoring trends; Excavation hold point. |
No site measurements, equipment manuals for the actual installation, inspection records or signed technical approvals were supplied. Confirm the applicable requirements and actual product instructions before use; record each criterion with its units, source and equipment or work-area ID.
Singapore site planning
Before drilling, reconcile the approved anchor geometry and property/service interfaces with the actual ground information and the Singapore project ERSS plan. Identify the appointed QP and, where applicable, geotechnical and checking roles; a generic supervisor label does not replace them. Link each anchor ID to grout/curing evidence, the actual jack–gauge calibration, force in kN and movement in mm. Escalate abnormal movement to the design team and keep the next excavation stage on hold until the project-specific support and monitoring review is accepted.
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Confirm design | 1. Utility strike2. Weak anchorage3. Ground loss4. Support instability | 1. Unsurveyed bore path2. Wrong design stage3. Location changed4. No test criteria | 1. Locate underground services2. Match staged design3. Confirm anchor location4. Approve test plan | 1. Utility clearances2. QP-approved anchor drawing3. Ground information4. Acceptance criteria | ||||
| 2. Set drilling rig | 1. Rig overturn2. Hose trip3. Mast collision4. Crushed personnel | 1. Weak working platform2. Cluttered access3. Mast obstruction4. Mixed work zones | 1. Check platform support2. Route hoses safely3. Check mast clearance4. Separate drilling zones | 1. Platform inspection2. Drainage and slope3. Rig positioning4. Signals and access | ||||
| 3. Drill bore | 1. Rotating-rod entanglement2. Bore collapse3. Material ejection4. Ground settlement | 1. Missing guards2. Changed water inflow3. Uncontrolled discharge4. Missing bore log | 1. Guard rotating parts2. Stop on ground changes3. Control spoil discharge4. Record each bore | 1. Rod handling isolation2. Depth and angle3. Water and strata4. Bore condition | ||||
| 4. Insert and grout | 1. Tendon recoil2. Hose release3. Poor bond4. Grout contact | 1. Tendon damage2. Loose connection3. Unrecorded grout loss4. Poor splash control | 1. Support long tendons2. Inspect grout system3. Log grout and losses4. Use grout protection | 1. Tendon protection2. Free and bond lengths3. Grout batch and volume4. Connections and pressure | ||||
| 5. Prepare test | 1. Premature pullout2. Jack failure3. Wrong force estimate4. Reaction movement | 1. No curing evidence2. Misaligned jack3. Gauge mismatch4. Weak bearing support | 1. Verify grout curing2. Align jack and bearing3. Match calibration4. Clear tendon axis | 1. Curing evidence2. Equipment IDs3. Calibration relationship4. Reaction condition | ||||
| 6. Stress and lock | 1. Tendon rupture2. Anchorage release3. Wall movement4. Stored-energy strike | 1. Load step exceeded2. Movement ignored3. Pressure-only judgment4. Lock-off loss missed | 1. Follow approved steps2. Track time and movement3. Keep axis clear4. Verify load transfer | 1. Force-time trace (kN)2. Movement/creep (mm)3. Lock-off result4. Bearing movement | ||||
| 7. Hold defects | 1. Sudden tension release2. Hydraulic injection3. Repeat failure4. Unstable reaction | 1. Approach under load2. Pressurized disconnect3. Unreviewed restressing4. Wedges struck | 1. Stop additional loading2. Control stored energy3. Engineer recovery plan4. Prohibit improvised release | 1. Residual tension2. Hydraulic state3. Cause and repairs4. Retest authorisation | ||||
| 8. Stage handoff | 1. Support collapse2. Loss of lock-off3. Failed anchor used4. Monitoring gap | 1. Single-anchor approval2. Unprotected head3. Defect omitted4. No excavation release | 1. Link anchor results2. Protect anchor heads3. Flag rejected anchors4. Release support stage | 1. Anchor ID and result2. Lock-off protection3. Monitoring trends4. QP stage-release record |
P = likelihood; S = severity; R = risk using the site method; A = site acceptance/authorisation. Complete after actual assessment; no score overrides an unresolved hold point or equipment limit.
4. Fictional scenario and failure mechanisms
Retained AI-generated educational illustration from the source edition; not a real incident photograph, approved installation drawing or evidence of equipment suitability.
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Item | Fictional scenario |
|---|---|
| Initial | A cured anchor is undergoing its planned load test. |
| Change | Movement continues near the intended load and the bearing assembly shifts. |
| Failure | The crew treats gauge pressure as the sole pass criterion. |
| Outcome | Tendon failure, anchorage release or inadequate excavation support can follow. |
| Barrier | Stop loading, clear the tendon axis and compare calibration, reaction and load-time-movement records before an engineered recovery decision. |
Why the controls matter
Pump pressure is not tendon force. Link the actual jack and gauge to their valid calibration relationship and confirm that the reaction arrangement matches the test plan.
Load, elapsed time and movement must be interpreted together. Reaching the pressure target does not establish bond performance, acceptable creep or sound anchorage.
Testing and lock-off are different transitions. Check load transfer and seating loss before equipment removal; one accepted anchor does not release the entire excavation support stage.
Decision sequence
| Step | Decision |
|---|---|
| Known | Movement continues near the intended load and the bearing assembly shifts. |
| Unknown | Actual condition, extent of damage and suitability of curing evidence, equipment ids remain to be established. |
| Hold | The crew treats gauge pressure as the sole pass criterion. |
| Evidence | Link curing evidence, equipment ids, calibration relationship, reaction condition, residual tension, hydraulic state to the affected equipment or work area. |
| Next | Stop loading, clear the tendon axis and compare calibration, reaction and load-time-movement records before an engineered recovery decision. |
5. Conditional decisions and common errors
| Condition | Action | Evidence | Proceed when |
|---|---|---|---|
| Curing unclear | Hold stressing | Grout and strength evidence | Curing criteria met |
| Gauge mismatch | Match jack and gauge | Equipment IDs and calibration | Calibration matched |
| Movement change | Stop and investigate | Load-time-movement record | Cause addressed |
| Next excavation | Review the whole support stage | Lock-off and monitoring records | Stage released |
Similar appearance, different evidence
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Comparison | Supported decision | Insufficient basis |
|---|---|---|
| Condition | Grout and strength evidence | Curing unclear has not been resolved. |
| Evidence | Load-time-movement record | A photograph or a completed-looking task without the relevant inspection record. |
| Release | Stage released | Completion of one step does not release the excluded tasks in section 2. |
6. Roles and responsibilities
| Role | Responsibility |
|---|---|
| Work supervisor | Assign the task boundary, stop authority, interfaces and emergency communication for ground anchor drilling and stressing. |
| Technical lead | Confirm Utility clearances; Anchor drawing; Ground information; Acceptance criteria. Resolve design and manufacturer limits before work. |
| Authorised crew | Apply Rod handling isolation; Depth and angle; Water and strata; Bore condition. Stop when the working arrangement changes. |
| Inspector / receiving lead | Review Curing evidence; Equipment IDs; Calibration relationship; Reaction condition. Transfer Anchor ID and result; Lock-off protection; Monitoring trends; Excavation hold point. |
Role labels allocate responsibilities; they do not confer a legal qualification. Verify the competence, training and authority required for the actual task.
The principal and employers coordinate the risk assessment and safe work procedures. These role labels allocate work; verify any qualifications and statutory appointments required for the actual Singapore activity. The receiving person must be given restrictions and unresolved defects before handover.
Record and handover perspective
| Stage | Record controls | Verification |
|---|---|---|
| Confirm design | 1. Record utility clearances2. Record qp-approved anchor drawing3. Record ground information | 1. QP-approved anchor drawing2. Ground information3. Acceptance criteria |
| Drill bore | 1. Record rod handling isolation2. Record depth and angle3. Record water and strata | 1. Depth and angle2. Water and strata3. Bore condition |
| Insert and grout | 1. Record tendon protection2. Record free and bond lengths3. Record grout batch and volume | 1. Free and bond lengths2. Grout batch and volume3. Connections and pressure |
| Prepare test | 1. Record curing evidence2. Record equipment ids3. Record calibration relationship | 1. Equipment IDs2. Calibration relationship3. Reaction condition |
| Hold defects | 1. Record residual tension2. Record hydraulic state3. Record cause and repairs | 1. Hydraulic state2. Cause and repairs3. Retest authorisation |
| Stage handoff | 1. Record anchor id and result2. Record lock-off protection3. Record monitoring trends | 1. Lock-off protection2. Monitoring trends3. QP stage-release record |
7. Hold points and record comparison
| Hold point | Evidence before release | Actual record |
|---|---|---|
| HP-0 Start | Drill, install tendons, grout, verify curing, test, stress and lock off ground anchors, then hand over the excavation stage. | |
| HP-1 Set drilling rig | Platform inspection; Drainage and slope; Rig positioning; Signals and access | |
| HP-2 Drill bore | Rod handling isolation; Depth and angle; Water and strata; Bore condition | |
| HP-3 Stress and lock | Force-time trace (kN); Movement/creep (mm); Lock-off result; Bearing movement | |
| HP-4 Stage handoff | Anchor ID and result; Lock-off protection; Monitoring trends; QP stage-release record |
These are internal hold points, not issued permits. Recheck affected points after a change, fault or shift handoff; link the actual approval record.
Record comparison
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
The boxes are static record prompts, not interactive or saved approvals. A tick does not establish suitability or permission to restart. Record the evidence, person, time and unresolved issues; retain the change history.
| Record | Insufficient | Record checklist |
|---|---|---|
| Confirm design | "Checked" without target, criteria or result | □ Utility clearances□ Anchor drawing□ Ground information□ Acceptance criteria |
| Drill bore | "Checked" without target, criteria or result | □ Rod handling isolation□ Depth and angle□ Water and strata□ Bore condition |
| Prepare test | "Checked" without target, criteria or result | □ Curing evidence□ Equipment IDs□ Calibration relationship□ Reaction condition |
| Stage handoff | "Checked" without target, criteria or result | □ Anchor ID and result□ Lock-off protection□ Monitoring trends□ Excavation hold point |
Hold points are internal checks. Determine separately whether Singapore statutory or site permit requirements apply to this work. Leave confirmation, measurements and approval records blank until the authorised site process is completed.
8. Site checklist and emergency response
| Check | Result | Person / action |
|---|---|---|
| □ Confirm design: Utility clearances | ||
| □ Set drilling rig: Platform inspection | ||
| □ Drill bore: Rod handling isolation | ||
| □ Insert and grout: Tendon protection | ||
| □ Prepare test: Curing evidence | ||
| □ Stress and lock: Load-time trace | ||
| □ Hold defects: Residual tension | ||
| □ Stage handoff: Anchor ID and result | ||
| □ Emergency access and handoff restrictions |
Stop work
Stop loading for sudden pressure or movement changes, moving bearing assemblies, tendon damage or hydraulic defects. Clear the tendon axis and keep further stressing and excavation on hold.
Emergency response
Stop from a safe location, exclude people from the affected danger zone and activate the site emergency plan. Call the site emergency service for injury or immediate danger. Do not enter an unstable, energised or confined danger area for an improvised rescue; trained responders must control the specific energy and access hazards.
9. Sources and review limits
Official public sources read for this Singapore edition on 2026-10-14. Guidance, statutory explanations and manufacturer limits have different roles; no source provider has approved this JSA.
| Source | Read scope and application limits |
|---|---|
| MOM — Risk management | Official explanation: employer, self-employed person and principal responsibilities; routine and non-routine risk assessment; hierarchy of controls; multidisciplinary assessment team. Official explanation of risk-management duties; no claim of reading the full linked statute. It does not specify task-specific equipment limits. Assess ground anchor drilling and stressing with employers, principal and affected contractors; resolve the inputs in section 2. |
| MOM — When should my company review its risk assessment? | Review every three years, after significant changes, new machinery/substances/procedures, hazard-related injury or incident, and when assessment is inadequate. General review guidance. A review interval does not permit continued operation after a known hazard or change. Reassess this operation after changes, defects, incidents or an inadequate assessment; do not wait for a scheduled review. |
| MOM — Permit-to-Work Systems | Formal work authorisation and coordination; OPEC tripartite guidance and competent permit authority with authority to reject work. OPEC-focused guidance page; not evidence of a blanket statutory permit requirement for every task. Determine permits for this actual activity and workplace; distinguish the section 7 internal hold points from statutory or site permits. |
| BCA — Advisory Note 1/09 on Earth Retaining or Stabilising Structures | Note introduction and site-investigation section; staged-construction approval and monitoring record forms on PDF pages 15 and 21–22. Currently linked by the BCA structural-plan guidance page. 2009 advisory, read in the stated sections only. Check later circulars and project conditions with the appointed QP; no anchor design load, creep criterion or generic excavation depth is prescribed here. Use the ERSS source for ground investigation and evidence-based stage release; use machinery guidance for rig guarding and control of hydraulic/mechanical energy. No engineering adequacy is certified. |
| WSH Council — Guidelines on Safe Use of Machinery | Sections 1.1 and 1.3: scope and explanation of safeguarding/LOTO duties. Sections 4.3–4.4.3: training, maintenance, specified replacement parts and isolation of all energy sources; commissioning safety-device checks. Official practical guidance and explanation; complete current subsidiary legislation and every annex were not read. Actual manufacturer isolation and restoration instructions remain necessary. Use the ERSS source for ground investigation and evidence-based stage release; use machinery guidance for rig guarding and control of hydraulic/mechanical energy. No engineering adequacy is certified. |
The BCA material read is an advisory and selected construction-record forms, not a completed design or approval. Determine applicable current Building Control and WSH construction requirements with the project team. Test increments, durations, creep limits, lock-off loads and recovery arrangements must come from the approved design and equipment instructions.
Actual site measurements, equipment instructions, engineering checks and signed approval records were not supplied. A qualified person must resolve these before use.
10. PDF guidance and FAQ
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
Content group
jsa-anchor-stressing
Is target pump pressure a passing test?
No. Use the calibrated load and the approved time, movement and lock-off acceptance criteria.
Can another jack calibration chart be used?
The calibration must apply to the actual jack and measuring system.
Can the jack be removed after the test peak?
Only after the approved load-transfer, lock-off and removal conditions are satisfied.
Does one passing anchor permit deeper excavation?
No. The entire support stage, monitoring trends and unresolved anchors must be reviewed.
Has a professional approved this JSA?
This reference material was written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site approval are necessary before field use.
11. Revision history and authorship
AI-generated reference material; not professionally verified or approved. Before use, a qualified person must review and adapt it to applicable Singapore requirements, the actual equipment/site and approved safe work procedures.
This Singapore edition was adapted from the Korean original and its assigned US technical reference. Earlier source revisions are archival editorial history, not Singapore technical approval.
| Date | Edition | Change | Review status |
|---|---|---|---|
| 2026-09-19 | Korean source v1.0 | Source editorial publication or revision; retained as provenance of the Korean edition. | Editorial record only; no professional technical approval recorded. |
| 2026-09-30 | Korean source v1.1 | Source editorial publication or revision; retained as provenance of the Korean edition. | Editorial record only; no professional technical approval recorded. |
| 2026-10-14 | 1.0 en-SG | Singapore legal scope, local planning, responsibility interfaces and SI terminology; new PDF A/B/C. | AI editorial and visual review only; no professional approval. |