8AM CONSTRUCTION | MASTER WBS

Occupied-Site Phasing, Access & Dust Control

01.12 — Preliminaries & Enabling Works
ការបែងចែកដំណាក់កាលការងារ ការគ្រប់គ្រងច្រកចេញចូល និងធូលី ក្នុងអគារដែលកំពុងប្រើប្រាស់

1. Simple Meaning — អត្ថន័យងាយយល់

Occupied-Site Phasing, Access & Dust Control means organizing construction or renovation work in a building that is still being used by people, while keeping occupants safe, maintaining access, and preventing dust from spreading.

ជាភាសាខ្មែរ៖ គឺជាការរៀបចំការងារសាងសង់ ឬជួសជុល ជាដំណាក់កាល នៅក្នុងអគារដែលនៅមាន មនុស្សរស់នៅ ឬកំពុងប្រើប្រាស់ ដោយធានាសុវត្ថិភាព ផ្លូវចេញចូល និងការពារធូលីមិនឱ្យរាលដាល ទៅតំបន់ផ្សេងៗ។

Simple Example:

Renovating a shop while the owner continues operating the business. The contractor renovates one section at a time, protects customer walkways, and installs temporary dust barriers.

2. Understand the Three Main Parts

1. Occupied-Site Phasing — ការបែងចែកការងារជាដំណាក់កាល

Dividing construction into separate zones or time periods so occupants can continue using unaffected areas.

Example: Renovate Zone A first while Zone B remains open.

Image reference: Janser

2. Access Control — ការគ្រប់គ្រងច្រកចេញចូល

Providing safe, clearly marked routes for occupants, workers, material deliveries, and emergencies.

Example: Set up a protected customer walkway separate from the construction entrance.

Image reference: Fasadspecialisten

3. Dust Control — ការគ្រប់គ្រងធូលី

Preventing construction dust from spreading into occupied spaces.

Example: Install sealed partitions, use suitable dust extraction, and clean the work zone daily.

Image reference: US Cleaning Tools

3. Main Differences — ភាពខុសគ្នា

Activity	Main Focus	Main Question
Phasing	Work sequence	Where and when can we work?
Access	Safe movement	How can people enter and exit safely?
Dust Control	Air and cleanliness	How do we stop dust spreading?

Easy Way to Remember:

Phasing: Work area by area.
Access: Keep people moving safely.
Dust Control: Keep dust inside the work zone.

4. Main Activities — ការងារសំខាន់ៗ

A. Work-Zone Separation

• Divide the building into work and occupied zones.
• Install temporary partitions or barriers.
• Protect furniture and existing finishes.
• Provide controlled work-zone entrances.

Image reference: Protective Trade Group

B. Access & Occupant Protection

• Provide safe pedestrian routes.
• Install signs and protective barriers.
• Schedule deliveries during suitable hours.
• Keep emergency exits and essential services available.

Image reference: MeinBezirk

C. Dust & Airflow Management

• Install properly sealed dust barriers.
• Use suitable HEPA filtration or extraction.
• Control ventilation pathways.
• Clean and inspect work areas before reopening.

Image reference: Tebo

EPA guidance recommends separating work zones from occupied spaces, controlling shared ventilation pathways, containing dust at the source, and cleaning debris regularly.

Reference: US EPA — Indoor Air Quality During Remodeling

5. Simple Workflow — ដំណាក់កាលអនុវត្ត

Step 1 — Survey Occupied Areas

ពិនិត្យទីតាំងដែលមានមនុស្សកំពុងប្រើប្រាស់

↓

Step 2 — Plan Phases & Access

បែងចែកដំណាក់កាលការងារ និងកំណត់ផ្លូវចេញចូល

↓

Step 3 — Install Protection

ដំឡើងរបាំងការពារ និងប្រព័ន្ធគ្រប់គ្រងធូលី

↓

Step 4 — Execute & Monitor

អនុវត្តការងារ និងត្រួតពិនិត្យសុវត្ថិភាពប្រចាំថ្ងៃ

↓

✓ Step 5 — Clean, Inspect & Reopen

សម្អាត ត្រួតពិនិត្យ និងបើកតំបន់ឱ្យប្រើប្រាស់វិញ

6. Practical Renovation Example — Shop Renovation

Example: A shop must continue serving customers during renovation.

Simple Occupied-Site Phasing Plan

🏗️

Zone A

Phase 1
Work

🛡️

Barrier

Dust
Separation

👥

Zone B

Shop
Operating

Conceptual zoning diagram only. Actual partitions, access and emergency escape routes must be planned for the specific building.

Example Sequence

1. Renovate Zone A while Zone B continues operating.
2. Clean and inspect Zone A, then obtain approval to reopen it.
3. Move business operations into approved Zone A.
4. Renovate Zone B behind new protective barriers.
5. Complete final inspection and handover.

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Important:

Occupied areas must remain safe and have adequate access and emergency escape routes throughout the renovation.

If safe occupancy cannot be maintained, temporarily relocate the affected occupants.

7. Practical BOQ Examples

Work Activity	Description	BOQ Unit
Temporary Dust Partition	ដំឡើងរបាំងបិទធូលីបណ្តោះអាសន្ន	m²
Temporary Hoarding	ជញ្ជាំងការពារបណ្តោះអាសន្ន	m²
Protected Walkway	រៀបចំផ្លូវដើរសុវត្ថិភាព	m, m², LS
Dust Extraction	ឧបករណ៍បឺតធូលី និងចម្រោះខ្យល់	day, week, LS
Furniture Protection	គ្របសម្ភារៈ និងគ្រឿងសង្ហារិម	m², LS
Phased Work Setup	រៀបចំការងារជាដំណាក់កាល	phase, LS
Temporary Signage	ស្លាកសញ្ញាចរាចរណ៍ និងសុវត្ថិភាព	no., LS
Special Cleaning	សម្អាតធូលីមុនប្រគល់តំបន់	m², LS

BOQ units are illustrative. Define installation, relocation, maintenance, and removal of temporary barriers separately where necessary, and avoid double counting with PRE-06, PRE-07 and PRE-08.

8. Safety & Dust-Control Requirements

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Important: Never allow renovation dust or unsafe construction activities to affect occupied spaces.

មិនត្រូវឱ្យធូលី ឧបករណ៍ សម្ភារៈ ឬសកម្មភាពសាងសង់ បង្កគ្រោះថ្នាក់ ដល់មនុស្សដែលកំពុងប្រើប្រាស់អគារឡើយ។

Typical Dust-Control Measures

• Install sealed dust barriers.
• Use suitable local dust extraction or wet suppression where appropriate.
• Plan HVAC isolation and airflow pathways.
• Separate occupants from construction activities.
• Use suitable HEPA-filtered cleanup.
• Consider negative-pressure containment when required by the risk assessment.

Assess hazardous materials such as asbestos, lead-containing coatings and silica dust, together with fire safety, noise and temporary service interruptions, before selecting work methods.

Hazardous materials may require specialist assessment and controls.

Guidance: US EPA — Safe Renovation and Repair | Occupied Building Air Quality Guidance

9. Simple Checklist for 8AM

PRE-12 Readiness Checklist 0 / 12 completed

Identify occupied and active construction areas. Agree on working hours and phased sequence with the owner. Prepare approved access routes and emergency exit arrangements. Install secure temporary barriers and dust partitions. Protect existing furniture, finishes and equipment. Review shared HVAC and other existing service interfaces. Arrange dust extraction and suitable ventilation controls. Install warning signs and restrict unauthorized entry. Notify occupants before noisy or disruptive activities. Inspect barriers and dust controls throughout the work. Clean and inspect each phase before reopening. Record owner approval and phase handover.

Checklist progress is saved in this browser when local storage is available.

10. Connection to WBS & BOQ

WBS Code	PRE-12
Work Category	Occupied-Site Phasing, Access & Dust Control
Khmer	ការបែងចែកដំណាក់កាលការងារ ការគ្រប់គ្រងច្រកចេញចូល និងធូលី ក្នុងអគារដែលកំពុងប្រើប្រាស់
Typical BOQ Units	LS, phase, m², m, week
Responsible	Project Manager / Site Engineer / HSE Supervisor
Key Outputs	Phasing plan, access plan, dust-control plan, inspection and handover records

BOQ Example — Occupied Office Renovation

WBS	Description	Quantity
PRE-12.01	Temporary Dust Partition	80 m²
PRE-12.02	Protected Pedestrian Access	1 LS
PRE-12.03	Dust Extraction & Air Filtration	4 weeks
PRE-12.04	Phased Work Coordination	2 phases
PRE-12.05	Special Cleaning Before Reopening	150 m²

Example quantities only, not a measured project estimate.

Important WBS Distinction for 8AM

WBS	Primary Scope
PRE-05	Demolition, Dismantling & Removal — Remove existing building components.
PRE-06	Temporary Works & Protection — General temporary protection and support.
PRE-07	Site Safety, Health & Environment — General HSE management and safety controls.
PRE-08	Site Management & Logistics — Overall site operations and logistics.
PRE-12	Occupied-Site Phasing, Access & Dust Control — Additional controls needed because people remain in the building.

BOQ Control — Prevent Double Counting

Define the boundaries between general temporary protection, site safety, site logistics, and occupied-site protection.

ត្រូវកំណត់ព្រំដែនការងាររបស់ WBS នីមួយៗឱ្យបានច្បាស់ ដើម្បីចៀសវាង ការគណនាបរិមាណ និងតម្លៃស្ទួនគ្នា។

11. Easy Way to Remember

📅

Phasing = Work Area by Area

បែងចែកការងារតាមតំបន់ និងដំណាក់កាល

🚶

Access = Keep Routes Safe

រក្សាច្រកចេញចូល ឱ្យមានសុវត្ថិភាព

🛡️

Dust Control = Keep Dust Contained

ទប់ស្កាត់ធូលី មិនឱ្យរាលដាល

Main Goal — គោលដៅសំខាន់

Continue construction while keeping building occupants safe, maintaining essential operations, and minimizing dust, noise, disruption and delays.

អនុវត្តការងារជួសជុល ឬសាងសង់ ខណៈដែលអគារនៅបន្តប្រើប្រាស់ ដោយរក្សាសុវត្ថិភាព កាត់បន្ថយធូលី សំឡេងរំខាន និងផលប៉ះពាល់ដល់អ្នកប្រើប្រាស់អគារ។

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