# A Typology Model of Temporary Facility Constraints for Automated Construction Site Layout Planning
## 2 Literature Review
In addition, the constraint that determines the minimum or maximum distance between the two facilities in relation to the operation, safety, and security of the site is often referred to as \"minimum and maximum distance constraints\" [31; 41], but also called \"object adjacency constraint\" or \"facility proximity constraint\" [35]. In this regard, the development of a temporary facility constraint typology model is important as it can provide common vocabularies for the identification and classification of CSLP constraints. \begin{table}
\begin{tabular}{c c c c} \hline
**Ref.** & **Automation Methods** & **Constraints Applied** & **Description** \\ \hline
[6] & GA 1 & Exclusion of facilities & Limit the placement of material storage in environmentally sensitive areas \\  & & Inter-facility distance & Keep the noisy workshop away from the office and place the T/C close to \\  & & the building & \\ \hline
[27] & ABC 2 & Tower cense access & Ensure that temporary facilities such as the laydown area should be placed within the radius of T/C \\  & & & the radius of T/C \\ \hline
[30] & GA & Proximity or remoteness of particular facilities & Keep let storage away from risk-sensitive areas and make sure that the site office is located relatively quiet and remote from the area where construction activity \\  & & & takes place \\ \hline
[31] & GA & Inclusion/exclusion area & Place a given T rise/outside the boundary of the area \\  & & & Limit the minimum/maximum distance between the points of TFs and other \\  & & Min/max distance & facilities \\  & & Distance & Limit the minimum distance between T/C and TFs to avoid falling objects \\  & & Size & Limit the size of some TFs according to the characteristics of the site \\  & & Inclusion/exclusion & Limit the region where TFs are laid out depending on the \\  & & & favorable/unravobile area \\ \hline
[34] & PSO 3 & Inter-facility distance & Maintain the distance between all pairs of TFs for safety or productivity reasons \\  & & & \\ \hline
[35] & BMILP 4 & Object Adjacency & Make sure that the TFs and some objects are adjacent to each other \\  & & Object-Region & Do not allow TFs to be located in a specific region depending on the site conditions \\  & & Facility proximity & Place TFs and some objects within the minimum distance of each other on the site \\  & & Visibility & Ensure that one or more objects are visible from a specific location on the \\  & & & construction site \\ \hline
[36] & GA & Safety & Maintain the minimum safety distance between TFs and other objects \\  & & Tower crane & Place a specific material storage yard in the radius of T/C \\  & & Site Accessibility & Make sure that all TFs keep a minimum distance of 1m from the path \\ \hline
[41] & ADPA 5 & Min/max distance & Provide a safe buffer distance around the building, or ensure that the distance \\  & & Inclusion/exclusion zone & between T/C and supply point does not exceed the reach distance of T/C \\  & & & Limit or allow the layout of TFs within a specific area \\ \hline \end{tabular}  
* genetic algorithm, 2 artificial live colony; 3 particle swarm optimization; 4 binary-mixed-integer programming. 5 approximate dynamic programming algorithm.  
\end{table} 
Table 1: Some CSLP automation models and constraints applied in the models except boundary and overlap constraints.