Construction site layout planning practices in inner-city building projects: space requirement variables, classification and relationship

Figures & data

Table 1. Inner-city building construction projects types Vs category of urban redevelopment. After (El-Anwar et al., 2014; Habitat, 2020; Uzon, 2005; Özdemirli, 2014).

Basics	Types of urban redevelopment project types
Reason for redevelopment		Informal settlement	Slums	Rezoning/land-use change	None-worthing to the optimum value for owner/communities
Relationship with City plan		Regularization plan	Upgrading Plan	Included in the Regular city plan	Out-of-city plan requirements/based on optimum valuing
Implementing bodies	Local government agencies	Housing Programs	Housing Programs
	Landowners	Standardizing	standardizing	Changing the requirements	High-value building type
	Land lease right holders	>>	>>	>>	>>
	Real-estate developers	Development	Development	>>	>>
	Redevelopment Association	Standardizing	standardizing	>>	>>
Types of Building	Single-family house	✓	✓	✓	✓
	Apartment	✓	✓	✓	✓
	Mixed Use building	✓	✓	✓	✓
	Public services	✓	✓	✓	✓
	Hotels	✓	✓	✓	✓
	Malls/markets	✓	✓	✓	✓
	Neighborhood development	✓	✓	✓	✓

Table 2. Space requirement variables and classification for inner-city building construction projects.

S/No.	Lists of space requirements in building construction sites	S/No.	Lists of space requirements in building construction sites
A	Micro-level spaces (spaces required close to the building)	B	Macro level space (area for temporary facilities placement)
1	Construction activities working area for crew	5	Temporary office
2	Layout areas (bending yards, prefabrication areas)	6	Storage facilities for scaffolding and form works
3	Protected space	7	Storage facilities for Cement warehouse
4	safety zone and hazard area	8	Rebar storage yard
C	Paths (space required to be left clear for transporting)	9	Storage facilities for MEP
26	Worker personnel path	10	Tile storages
27	Material and debris path	11	storage for panels
28	Site accessibility (road and footpath)	12	Tools storage
29	Traffic control	13	stockpile (sand and aggregate storage yard)
30	Weighbridge	14	Tower crane/hoist area
31	Main gate and side gate	15	Batching plant area/Concrete mixer
		16	Utility facilities area (sanitary)
		17	Utility area (water tank)
		18	Utility area for generator
		19	Change room (Lockers)
		20	Jobsite security house
		21	Debris area (waste stockpile)
		22	Unloading area
		23	Temporary material staging area (for placing from a crane)
		24	Material Distribution area next to a workstation
		25	Equipment area

Table 3. Stability test for Delphi round one and two: Pooled response on the level of impact of the variables on CSLP practices for inner-city building projects.

List of space requirements	a. Observed Frequencies				b. Expected Frequencies
	Round	Less impact	Moderate impact	High impact	Less impact	Moderate impact	High impact	X^2
Construction activities working area for crew	1	0	0	12	0	0.5	11.5	0.47
	2	0	1	11	0	0.5	11.5
layout areas (bending yards, prefabrication areas)	1	0	4	8	0	3	9	0.505
	2	0	2	10	0	3	9
protected space	1	2	6	4	1	4	7	0.193
	2	0	2	10	1	4	7
Safety zone and hazard area	1	2	3	7	1	2	9	0.378
	2	0	1	11	1	2	9
Temporary office	1	0	2	10	0	1.5	10.5	0.663
	2	0	1	11	0	1.5	10.5
Storage facilities for scaffolding and formworks	1	0	3	9	0	3	9	1
	2	0	3	9	0	3	9
Storage facilities for Cement warehouse	1	0	3	9	0	2	10	0.439
	2	0	1	11	0	2	10	0.439
Rebar storage yard	1	2	4	6	1	2.5	8.5	0.268
	2	0	1	11	1	2.5	8.5
Storage facilities for MEP	1	3	6	3	1.5	4	6.5	0.112
	2	0	2	10	1.5	4	6.5
Tile storages	1	2	3	7	1	3	8	0.57
	2	0	3	9	1	3	8
Storage for panels	1	2	6	4	1.5	4.5	6	0.513
	2	1	3	8	1.5	4.5	6
Tools storage	1	0	3	9	0.5	2	9.5	0.599
	2	1	1	10	0.5	2	9.5
Stockpile (sand and aggregate storage yard)	1	0	2	10	0.5	2	9.5	0.769
	2	1	2	9	0.5	2	9.5
Tower crane/hoist area	1	0	0	12	0.5	1	10.5	0.424
	2	1	2	9	0.5	1	10.5
Batching plant area/Concrete mixer	1	1	3	8	1	2	9	0.737
	2	1	1	10	1	2	9
Utility facilities area (sanitary & water tank)	1	0	4	8	0.5	3.5	8	0.752
	2	1	3	8	0.5	3.5	8
Utility facilities area for power(generator)	1	2	3	7	1	2.5	8.5	0.505
	2	0	2	10	1	2.5	8.5
Change room (Lockers)	1	5	3	3	2.5	5	4	0.170
	2	0	7	5	2.5	5	4
Jobsite security house	1	5	4	3	2.5	5	4.5	0.202
	2	0	6	6	2.5	5	4.5
debris area (waste stockpile)	1	2	4	6	1	5	6	0.549
	2	0	6	6	1	5	6
Unloading area	1	0	3	9	0	3	9	1
	2	0	3	9	0	3	9
Temporary material staging area (for placing from a crane)	1	0	1	11	0	1.5	10.5	0.663
	2	0	2	10	0	1.5	10.5
Material Distribution area next to a workstation	1	3	3	6	1.5	4	6.5	0.409
	2	0	5	7	1.5	4	6.5
Equipment area	1	2	3	5	1	2.5	7.5	0.380
	2	0	2	10	1	2.5	7.5
Worker personnel path	1	2	3	7	1	2.5	8.5	0.505
	2	0	2	10	1	2.5	8.5
Materials and debris path	1	1	3	8	1	2.5	8.5	0.937
	2	1	2	9	1	2.5	8.5
Site accessibility (road and footpath)	1	0	3	9	0	2.5	9.5	0.722
	2	0	2	10	0	2.5	9.5
Traffic control	1	7	3	2	3.5	2.5	6	0.044
	2	0	2	10	3.5	2.5	6
Weighbridge	1	8	2	2	4	4	4	0.050
	2	0	6	6	4	4	4
Main gate, side gate	1	1	2	9	0.5	3	8.5	0.650
	2	0	4	8	0.5	3	8.5

Table 4. Consensus on impact level and probability of occurrence of the space requirement variables on the CSLP practice for inner-city building projects.

Category	Code	Space requirement lists	Impact Level			Probability of occurrence
			Median	Mean	QD	Median	mean	QD
Micro Space	V1	Construction activities working area for crew	5	4.31	0.5	4	4.08	0.5
	V2	layout areas (bending yards, prefabrication areas)	4	4.23	0.5	4	4.15	0.5
	V3	protected space	4	4	0.5	4	4.08	1
	V4	Safety zone and hazard area	4	4.23	0.5	4	3.85	1
Macro Space	V5	Storage facilities for Cement warehouse	5	4.54	0.5	5	4.23	1
	V6	Rebar storage yard	5	4.38	0.5	4	3.77	0
	V7	Tools storage	5	4.23	0.5	4	4	0.25
	V8	Tower crane/hoist area	5	4.23	0.5	4	4.08	0.25
	V9	stockpile (sand and aggregate storage yard)	5	4.15	1	4	4.08	0.25
	V10	Utility facilities area for power(generator)	4	4	0	4	3.85	0.25
	V11	Temporary material staging area	4	4	0	4	3.92	0.25
	V12	Temporary office	4	4.23	0.5	4	4	0.25
	V13	Storage facilities for MEP	4	4.08	0.5	4	4.23	0.5
	V14	Tile storages	4	3.92	0.5	4	4.08	0.5
	V15	Batching plant area/Concrete mixer	4	4.08	0.5	4	3.54	0.5
	V16	Utility facilities area (sanitary)	4	3.77	0.5	4	3.62	0.5
	V17	Equipment area	4	4.15	0.5	4	4	0.5
	V18	Utility facilities area (water tank)	4	3.83	0.63	4	4.31	0.5
	V19	storage facilities for scaffolding and form works	4	4.08	1	4	3.77	0.5
	V20	storage for panels	4	3.85	1	4	3.69	0.5
	V21	Unloading area	4	4	1	4	3.85	0.75
	V22	Material Distribution area next to work station	4	3.92	1	4	3.77	0.75
Paths	V23	Traffic control	4	4	0	5	4.38	0.5
	V24	Worker personnel path	4	4.15	0.5	4	3.92	0
	V25	Site accessibility (road and footpath)	4	4.23	0.5	4	4.08	0.5
	V26	Main & side gates	4	3.77	0.5	4	4.23	0.5
	V27	Materials and debris path	4	4	1	4	4	1
	V28	Change room (Lockers)	3	3.46	0.5	4	3.85	0.75
	V29	Jobsite security house	3	3.62	0.5	4	4	1
	V30	debris area (waste stockpile)	3	3.69	0.5	3	3.23	0.75
	V31	Weigh-bridge	3	3.46	0.5	3	3.15	0.5

Figure 1. Spearman correlations among space requirements for inner-city building projects.

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