A girder's strong-axis bending capacity does not establish stability during transport, lifting or temporary support. Identify lift points, centre of gravity and each changing support condition.
This reference material was written and reviced 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 if radius changes, lift point damaged, bracing incomplete. Keep the affected operation on hold until the listed evidence and proceed conditions are satisfied; a low risk score does not release missing safeguards.
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
Coordinate Singapore lifting, work-at-height and public-road interfaces for the engineered concrete-girder erection sequence. The lift plan and site permits must identify the responsible lifting team and each crane. Verify registration and examination status, while the project design authority establishes temporary member and support stability.
| 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 lifting guidance and MOM examination information for the cranes, gear and team; height guidance for protected access/rescue, and LTA guidance only when the road interface applies. The project engineer resolves staged structural stability. |
| 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 | These sources do not supply a girder design, temporary-bracing capacity, crane utilisation margin or release certificate. Tandem lifting in this erection plan needs explicit engineering and coordinated control; no generic equal-load assumption is made. Full project-specific bridge standards were not supplied. |
2. Scope and required inputs
Included scope
Receive, support, lift and place precast or prestressed concrete girders, verify bearing and lateral restraint, then transfer documented restrictions to subsequent work.
Separate assessment
Steel girders, segmental launching, marine crane operations, changed lifting points and damaged-member acceptance require separate engineered plans.
| Input | Evidence needed |
|---|---|
| Plan member and lift | Member and lifting points; Stage stability; Crane radii and shares; Traffic and services. |
| Set crane and rigging | Ground and setup; Rigging and inserts; Clearance plan; Crane configuration. |
| Place on bearings | Seat and contact; Girder inclination; Hands and exclusion; Temporary restraint. |
| Handoff stages | Brace retention; Connections and deck plan; Final survey; Receiving authority. |
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
The principal, erection contractor, lifting supervisor and project design team must agree each transport, lifting, bearing and brace-release stage. Check each crane at its actual radius and changing share rather than adding nameplate capacities. Record member mass in kg, geometry in mm or m and wind criteria with units and source. Before releasing rigging, inspect the complete lateral-restraint load path through brace connections and anchorages as well as vertical bearing contact. Where a public road is affected, obtain the actual LTA work and traffic arrangements. Carry stage restrictions into diaphragm, deck and brace-removal work.
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Plan member and lift | 1. Girder overturns2. Crane overload3. Wrong member4. Uncontrolled public exposure | 1. Center unknown2. Loads assumed equal3. ID mismatch4. Road interface open | 1. Verify erection design2. Check each crane load3. Match member records4. Plan exclusion and closure | 1. Member and lifting points2. Stage stability3. Each crane radius/load share4. Traffic and services | ||||
| 2. Receive and support | 1. Girder rolls2. Trailer shifts3. Bearing damage4. Person trapped | 1. Wrong support location2. Restraints released early3. Dunnage unsuitable4. Hands in support | 1. Use designed supports2. Sequence restraint release3. Inspect member condition4. Keep people clear | 1. Transport supports2. Member condition3. Restraints and route4. Receiving release | ||||
| 3. Set crane and rigging | 1. Crane overturns2. Rigging failure3. Power contact4. Dropped gear | 1. Ground unverified2. Wrong angles3. Envelope unchecked4. Hardware damaged | 1. Verify support reactions2. Use designed rigging3. Control overhead hazards4. Inspect rated gear | 1. Ground and setup2. Rigging and inserts3. Clearance plan4. Crane configuration | ||||
| 4. Trial and lift | 1. Unequal load2. Girder twists3. Collision4. Signal loss | 1. Motion uncoordinated2. Lift point wrong3. Path obstructed4. Multiple commands | 1. Brief lifting supervisor plan2. Check trial response3. Clear complete path4. Use agreed signals | 1. Trial balance2. Crane responses3. Lift route4. Communication | ||||
| 5. Place on bearings | 1. Finger crush2. Girder rotation3. Bearing displacement4. Edge fall | 1. Hand alignment2. Lateral restraint absent3. Wrong seat4. Unsafe access | 1. Use alignment tools2. Retain planned support3. Verify bearing position4. Provide protected access | 1. Seat and contact2. Girder inclination3. Hands and exclusion4. Temporary restraint | ||||
| 6. Brace and release | 1. Girder overturns2. Anchor failure3. Sudden load shift4. Adjacent impact | 1. Brace incomplete2. Weak anchor3. Ropes slackened early4. Wind unassessed | 1. Verify entire brace path2. Inspect connections3. Transfer load by plan4. Maintain weather controls | 1. Brace strength and stiffness2. Anchor and fasteners3. Release sequence4. Post-release stability record | ||||
| 7. Review abnormality | 1. Progressive instability2. Damaged member used3. Unsafe recovery4. Crane overload | 1. Movement dismissed2. Crack unmarked3. Improvised correction4. Radius altered | 1. Stop affected sequence2. Exclude collapse area3. Obtain engineered recovery4. Reassess equipment loads | 1. Observed movement2. Member damage3. Support and crane state4. Recovery authorisation | ||||
| 8. Handoff stages | 1. Early brace removal2. Deck overload3. Loose hardware4. Restrictions lost | 1. Next girder assumed enough2. Loads unreviewed3. Debris retained4. Records absent | 1. Retain required bracing2. Review subsequent loads3. Clear loose items4. Transfer stage restrictions | 1. Brace retention2. Connections and deck plan3. Final survey4. Receiving authority |
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 | Two cranes place a long concrete girder on bearings. |
| Change | The crew wants to slacken ropes before lateral braces are complete. |
| Failure | Vertical seating is mistaken for complete stability. |
| Outcome | Wind or eccentricity can rotate the girder or displace a bearing. |
| Barrier | Retain planned support until bearing contact, lateral braces and their anchorages meet the release criteria. |
Why the controls matter
A girder's strong-axis bending capacity does not establish stability during transport, lifting or temporary support. Identify lift points, centre of gravity and each changing support condition.
Do not add crane nameplate capacities or assume equal sharing. Assess each crane at its actual radius, rigging geometry, movement and share of load throughout the lift.
Bearing contact establishes a vertical load path; lateral restraint also needs adequate strength, stiffness and anchorage. Arrival of the next girder does not authorize removing a brace. Recheck staged loads as diaphragms and deck construction change the system.
Decision sequence
| Step | Decision |
|---|---|
| Known | The crew wants to slacken ropes before lateral braces are complete. |
| Unknown | Actual condition, extent of damage and suitability of seat and contact, girder inclination remain to be established. |
| Hold | Vertical seating is mistaken for complete stability. |
| Evidence | Link seat and contact, girder inclination, hands and exclusion, temporary restraint, observed movement, member damage to the affected equipment or work area. |
| Next | Retain planned support until bearing contact, lateral braces and their anchorages meet the release criteria. |
5. Conditional decisions and common errors
| Condition | Action | Evidence | Proceed when |
|---|---|---|---|
| Radius changes | Hold movement | Each crane load case | Reviced lift accepted |
| Lift point damaged | Quarantine member | ID and damage review | Use disposition issued |
| Bracing incomplete | Hold rope release | Bearing brace and anchor checks | Lateral stability verified |
| Next-stage load changes | Review temporary state | Connection and deck sequence | Stage loads accepted |
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 | Each crane load case | Radius changes has not been resolved. |
| Evidence | Bearing brace and anchor checks | A photograph or a completed-looking task without the relevant inspection record. |
| Release | Stage loads accepted | 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 precast concrete bridge girder lifting and erection. |
| Technical lead | Confirm Member and lifting points; Stage stability; Crane radii and shares; Traffic and services. Resolve design and manufacturer limits before work. |
| Authorised crew | Apply Ground and setup; Rigging and inserts; Clearance plan; Crane configuration. Stop when the working arrangement changes. |
| Inspector / receiving lead | Review Seat and contact; Girder inclination; Hands and exclusion; Temporary restraint. Transfer Brace retention; Connections and deck plan; Final survey; Receiving authority. |
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 |
|---|---|---|
| Plan member and lift | 1. Record member and lifting points2. Record stage stability3. Record each crane radius/load share | 1. Stage stability2. Each crane radius/load share3. Traffic and services |
| Set crane and rigging | 1. Record ground and setup2. Record rigging and inserts3. Record clearance plan | 1. Rigging and inserts2. Clearance plan3. Crane configuration |
| Trial and lift | 1. Record trial balance2. Record crane responses3. Record lift route | 1. Crane responses2. Lift route3. Communication |
| Place on bearings | 1. Record seat and contact2. Record girder inclination3. Record hands and exclusion | 1. Girder inclination2. Hands and exclusion3. Temporary restraint |
| Review abnormality | 1. Record observed movement2. Record member damage3. Record support and crane state | 1. Member damage2. Support and crane state3. Recovery authorisation |
| Handoff stages | 1. Record brace retention2. Record connections and deck plan3. Record final survey | 1. Connections and deck plan2. Final survey3. Receiving authority |
7. Hold points and record comparison
| Hold point | Evidence before release | Actual record |
|---|---|---|
| HP-0 Start | Task boundary, site RA, SWP, responsibilities and emergency arrangements | |
| HP-1 Receive and support | Transport supports; Member condition; Restraints and route; Receiving release | |
| HP-2 Set crane and rigging | Ground and setup; Rigging and inserts; Clearance plan; Crane configuration | |
| HP-3 Brace and release | Brace strength and stiffness; Anchor and fasteners; Release sequence; Post-release stability record | |
| HP-4 Handoff stages | Brace retention; Connections and deck plan; Final survey; Receiving authority |
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 |
|---|---|---|
| Plan member and lift | "Checked" without target, criteria or result | □ Member and lifting points□ Stage stability□ Crane radii and shares□ Traffic and services |
| Set crane and rigging | "Checked" without target, criteria or result | □ Ground and setup□ Rigging and inserts□ Clearance plan□ Crane configuration |
| Place on bearings | "Checked" without target, criteria or result | □ Seat and contact□ Girder inclination□ Hands and exclusion□ Temporary restraint |
| Handoff stages | "Checked" without target, criteria or result | □ Brace retention□ Connections and deck plan□ Final survey□ Receiving authority |
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 |
|---|---|---|
| □ Plan member and lift: Member and lifting points | ||
| □ Receive and support: Transport supports | ||
| □ Set crane and rigging: Ground and setup | ||
| □ Trial and lift: Trial balance | ||
| □ Place on bearings: Seat and contact | ||
| □ Brace and release: Brace strength and stiffness | ||
| □ Review abnormality: Observed movement | ||
| □ Handoff stages: Brace retention | ||
| □ Emergency access and handoff restrictions |
Stop work
Stop if radius changes, lift point damaged, bracing incomplete. Keep the affected operation on hold until the listed evidence and proceed conditions are satisfied; a low risk score does not release missing safeguards.
Emergency response
Stop coordinated movement from safe positions and keep people outside the possible collapse area. Do not slacken, pull or reposition an unstable girder by trial. Use the approved stage-specific holding and engineered recovery plan; call site emergency responders and the site emergency service for immediate danger or injury.
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 precast bridge girder erection 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. |
| WSH Council — Planning a Lift | Lift planning documents, load/equipment/crew/method/site information, complex-lift engineering, and stopping when site conditions differ from the approved plan. Official practical guidance, with crane-oriented examples. Statutory appointments and permit applicability depend on the equipment and activity; not an issued permit or support design. Use lifting guidance and MOM examination information for the cranes, gear and team; height guidance for protected access/rescue, and LTA guidance only when the road interface applies. The project engineer resolves staged structural stability. |
| MOM — Register Lifting Equipment | Equipment categories requiring registration, including chain blocks as lifting appliances, lifts/hoists, lifting machines and lifting gear. Registration overview; exemptions and equipment classification must be confirmed for the actual asset. Registration is not proof of suitability for a particular lift. Use lifting guidance and MOM examination information for the cranes, gear and team; height guidance for protected access/rescue, and LTA guidance only when the road interface applies. The project engineer resolves staged structural stability. |
| MOM — Circular MOM/OSHD/2025-05, lifting equipment tests and examination | All three pages: requirements effective 12 September 2025, category-specific examination intervals, registration and post-change tests, and footnotes defining hoists and competent-person lifting-gear re-examination. Category-specific official circular, not a site test certificate. Periodic overload testing was removed; do not substitute routine checks for required examinations or apply lifting-gear examiner provisions to every lifting appliance. Use lifting guidance and MOM examination information for the cranes, gear and team; height guidance for protected access/rescue, and LTA guidance only when the road interface applies. The project engineer resolves staged structural stability. |
| WSH Council — Preventing Falls from Height | Employer access/protection controls, workplace-dependent fall prevention plan, hazardous work at height PTW applicability and supervisor/assessor/authorised-manager process. Official overview, not a full reading of the WAH Regulations or linked codes. PTW threshold does not mean lower falls are safe; actual anchorage, access and rescue require assessment. Use lifting guidance and MOM examination information for the cranes, gear and team; height guidance for protected access/rescue, and LTA guidance only when the road interface applies. The project engineer resolves staged structural stability. |
| LTA — Requirements for Street Work Proposals | Current index explanations for public-street work permits, reinstatement and traffic-control planning; links to the applicable codes and traffic-regulation authorisation. Official overview read; it is not a permit or a complete reading of every linked traffic layout. Confirm the current code, work approval and road-specific conditions. Use lifting guidance and MOM examination information for the cranes, gear and team; height guidance for protected access/rescue, and LTA guidance only when the road interface applies. The project engineer resolves staged structural stability. |
These sources do not supply a girder design, temporary-bracing capacity, crane utilisation margin or release certificate. Tandem lifting in this erection plan needs explicit engineering and coordinated control; no generic equal-load assumption is made. Full project-specific bridge standards were not supplied.
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-girder-erection
Can two crane capacities be added?
No. Check each crane and changing load distribution.
Does contact with bearings permit release?
Only with the required lateral stability and approved release sequence.
Can a damaged lifting point be relocated?
Not without the required member and lifting-design review.
Does the next girder allow brace removal?
Only when the designed stage and release conditions are met.
Has a professional approved this JSA?
This reference material was written and reviced 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 v1.1 | Source editorial publication or revision; retained as provenance of the Korean edition. | Editorial record only; no professional technical approval recorded. |
| 2026-09-26 | Korean source v1.2 | 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. |