Safety assessment in design and preparation phase

Arbouw Health and Safety in construction industry.

Paul Swuste,TU Delft.

Adri Frijters,Arbouw.

Amsterdam,The Netherlands.www.arbouw.nl

Problem

Design a modelmodel

designerdesigner can use

to chosechose between alternative buildingbuilding elementselements on

basis of safetysafety aspects

during execution phaseexecution phase

Method and techniques

• Literature review

• Method

• Test / case

• Falling from ….• Stumbling ….

Result

• Method – Analyse elements– Function and properties– Initial and final situation– Selection of alternatives– Activities – Assessment & improvements– Selection of element

• Based upon– BS8800– EN1005 and EN292-1

Case study

• Eurotoren

Floor systems

• Hollow-core beam slab

• Wide-slab floor

The method

1. Preconditions

2. Inventory of applicable building systems

3. Determing the boundaries of the system

4. Inventory of the activities per construction form

5. Identification of hazards

6. Determing the risk

7. Decision regarding the acceptability of the risk

8. Allocating the man-hours to the activities

9. Determing exposure

10.Choice of building element

The method

1. Preconditions

2. Inventory of applicable building systems

3. Determing the boundaries of the system

4. Inventory of the activities per construction form

5. Identification of hazards

6. Determing the risk

7. Decision regarding the acceptability of the risk

8. Allocating the man-hours to the activities

9. Determing exposure

10.Choice of building element

Inventory of the activities

Wide-slab floor1. Erecting guardrail

2. Setting out dimensions

3. Adjusting props

4. Laying slabs

5. Checking dimensions

6. Dimensions reinforcement

7. Transport reinforcement

8. Welding-wire meshing

9. Twisting reinforcement

10. Preparing pouring

11. Arranging equipment

12. Pouring floor

13. Clearing up

14. After care

15. Cleaning

16. Stripping props

Hollow core-beam floor1. Erecting guardrail

2. Setting out dimensions

3. Applying bearing felt

4. Inserting end filling

5. Laying floor elements

6. Fitting bars

7. Applying tension rods

8. Pouring joints

The method

1. Preconditions

2. Inventory of applicable building systems

3. Determing the boundaries of the system

4. Inventory of the activities per construction form

5. Identification of hazards

6. Determing the risk

7. Decision regarding the acceptability of the risk

8. Allocating the man-hours to the activities

9. Determing exposure

10.Choice of building element

Determing the Risk

Minor injury Injury Serious injury

Highly improbable

Insignificant risk

Acceptable risk

Moderate risk

Improbable Acceptable

riskModerate

riskSignificant risk

Probable Moderate

riskSignificant

riskUnacceptable

risk

The method

1. Preconditions

2. Inventory of applicable building systems

3. Determing the boundaries of the system

4. Inventory of the activities per construction form

5. Identification of hazards

6. Determing the risk

7. Decision regarding the acceptability of the risk

8. Allocating the man-hours to the activities

9. Determing exposure

10.Choice of building element

Acceptability of risk

Wide-slab floor

Falling and stumbling

The method

1. Preconditions

2. Inventory of applicable building systems

3. Determing the boundaries of the system

4. Inventory of the activities per construction form

5. Identification of hazards

6. Determing the risk

7. Decision regarding the acceptability of the risk

8. Allocating the man-hours to the activities

9. Determing exposure

10.Choice of building element

Allocating man-hours

Wide-slab floor1. Erecting guardrail 4.00

2. Setting out dimensions 2.00

3. Adjusting props 15.12

4. Laying slabs 13.00

5. Checking dimensions

6. Dimensions reinforcement

7. Transport reinforcement

8. Welding-wire meshing

9. Twisting reinforcement 19.50

10. Preparing pouring

11. Arranging equipment

12. Pouring floor

13. Clearing up

14. After care

15. Cleaning 14.33

16. Stripping props 15.12

Hollow core-beam floor1. Erecting guardrail 4.00

2. Setting out dimensions 2.00

3. Applying bearing felt 1.70

4. Inserting end filling 3.36

5. Laying floor elements 10.80

6. Fitting bars 0.08

7. Applying tension rods 0.08

8. Pouring joints 1.48

The method

1. Preconditions

2. Inventory of applicable building systems

3. Determing the boundaries of the system

4. Inventory of the activities per construction form

5. Identification of hazards

6. Determing the risk

7. Decision regarding the acceptability of the risk

8. Allocating the man-hours to the activities

9. Determing exposure

10.Choice of building element

Determing exposure

Wide-slab floor1. Erecting guardrail 4.00

2. Setting out dimensions 2.00

3. Adjusting props 15.12

4. Laying slabs 13.00

5. Checking dimensions

6. Dimensions reinforcement

7. Transport reinforcement

8. Welding-wire meshing

9. Twisting reinforcement 19.50

10. Preparing pouring

11. Arranging equipment

12. Pouring floor

13. Clearing up

14. After care

15. Cleaning 14.33

16. Stripping props 15.12

Hollow core-beam floor1. Erecting guardrail 4.00

2. Setting out dimensions 2.00

3. Applying bearing felt 1.70

4. Inserting end filling 3.36

5. Laying floor elements 10.80

6. Fitting bars 0.08

7. Applying tension rods 0.08

8. Pouring joints 1.48

Minor injury

InjurySerious injury

Highly improbable

Insignificant risk

Acceptable risk

Moderate risk

Improbable Acceptab

le riskModerate

riskSignificant

risk

Probable Moderate

riskSignificant

riskUnaccepta

ble risk

Choise of element

Wide-slab floor1. Erecting guardrail 4.00

2. Setting out dimensions 2.00

3. Adjusting props 15.12

4. Laying slabs 13.00

5. Checking dimensions

6. Dimensions reinforcement

7. Transport reinforcement

8. Welding-wire meshing

9. Twisting reinforcement 19.50

10. Preparing pouring

11. Arranging equipment

12. Pouring floor

13. Clearing up

14. After care

15. Cleaning 14.33

16. Stripping props 15.12

Hollow core-beam floor1. Erecting guardrail 4.00

2. Setting out dimensions 2.00

3. Applying bearing felt 1.70

4. Inserting end filling 3.36

5. Laying floor elements 10.80

6. Fitting bars 0.08

7. Applying tension rods 0.08

8. Pouring joints 1.48

Minor injury

InjurySerious injury

Highly improbable

Insignificant risk

Acceptable risk

Moderate risk

Improbable Acceptab

le riskModerate

riskSignificant

risk

Probable Moderate

riskSignificant

riskUnaccepta

ble risk

Conclusions and Recommendations

• Method works• Method is easy to use• Method is labour-intensive

• Database

• Use in case of doubt

• Fulfil safety in design phase

• Acceptable

Thank You

for your attention www.arbouw.nl

frijters@arbouw.nl