# A Typology Model of Temporary Facility Constraints for Automated Construction Site Layout Planning
## 4 A Constraint Typology Model for CSLP
### Inter-Facility Distance Constraint
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**ID** & **Subtype** & **Facility** & **Constraints** \\ \hline IF1 & Min & Access road & All TFs should be separated at least x(m) from the access road. \\ \hline IF2 & Min & Common & TFs should be separated at least x(m) from the structure. \\ \hline IF3 & Min & Fencing & There should be at least x(m) separation distance between the fencing and the access road. \\ \hline IF4 & Min & Fencing & The distance between the fencing and the TF should be at least x(m) apart. \\ \hline IF5 & Min & Gate & The gate should be placed at least x(m) away from obstacles around the road so that they cannot interfere with entrance/exit through the gate. \\ \hline IF6 & Min & Site office & The office should be separated at least x(m) from the structure to be built. \\ \hline IF7 & Min & Storage & The storage should be separated at least x(m) from the structure to be built. \\ \hline IF8 & Min & T/C & The radius of the tower crane should not invade adjacent ground or adjacent roads. \\ \hline IF9 & Min & T/C & To prevent the risk of falling objects, certain TFs should be located outside the dangerous zone caused by the crane’s swing radius. \\ \hline IF10 & Min & T/C & The distance between a tower crane and surrounding obstacles should be larger than the length(m) of the main jib with some offset. \\ \hline IF11 & Min & T/C & The tower crane should reach all parts of the structure. \\ \hline IF12 & Min & T/C & When the self-weight of the crane is greater than x(ton), the crane should be separated from the excavation pit by at least a safety distance of y(m). \\ \hline IF13 & Max(L) & Elec. supply & The distance between the temporary transformer and the TF that consumes electricity cannot exceed x(m). \\ \hline IF14 & Max(L) & Gate & The gate should be adjacent to the outside road. \\ \hline IF15 & Max(T) & Laydown area & The distance between the outside laydown area and the edge of the nearest access road should be up to x(m). \\ \hline IF16 & Max(T) & Laydown area & The outside laydown area should be within a maximum of x(m) from the nearest hoist. \\ \hline IF17 & Max(T) & Parking lot & The outside parking lot should be located within a maximum of x(m) from the nearest gate. \\ \hline IF18 & Max(T) & Site office & The first site office should be located within a maximum of x(m) from the gate. \\ \hline IF19 & Max(T) & Toilet & The distance between the toilet and the work area should be x(m) or less. \\ \hline IF20 & Max(T) & Work area & The relevant work areas should be located close to each other regardless of a change in time \\ \hline IF21 & Min–max & Laydown area & The laydown area outside the building should be located within the radius of the crane. \\ \hline IF22 & Min–max & T/C & Given the self-weight of the lifting object and the tip load of the crane, TFs associated with the use of the crane should be located within the radius of the crane. \\ \hline IF23 & Min–max & T/C & When multiple cranes are used, adjacent cranes should have shared working area to distribute the lifting loads. \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Inter-facility distance constraints identified in this study. Material types (e.g., heavy material, light material) and transport modes (e.g., person, forklift) should also be considered for estimating the movement [36]. For example, light material can be transported by labor and wheelbarrows regardless of the path. However, heavy material requires heavy equipment such as a forklift and can be transported only through paths with sufficient widths. Some algorithms, such as A* search algorithm [36] and [PERSON]'s algorithm [28], are notable and can be utilized to find the shortest travel path.