5. GOOD INDUSTRY PRACTICES – INSTALLATION
5.1. Adopt Just-In-Time (JIT) concept
Adopting a just-in-time (JIT) concept, where MEP modules are delivered according to the construction sequence, eliminates congestion in the factory and minimises damages to the modules on site. BIM can be used to simulate the actual on-site installation to identify potential problems in the access route.
Close co-ordination between parties at the project site and factory is critical to ensure a smooth supply of modules to the site and minimise downtime due to missing modules on site.
5.2. Plan for logistics in advance
The method statements and risk assessments for lifting, installing and storing (if applicable) the modules on site require the builder’s inputs on the capacity of cranes, availability of access platforms on each floor for landing of modules, delivery routes of modules to their designated positions, and other logistics constraints.
Delivery of large pump skid and modules that may require traffic escorts should be planned in advance.
Figure 14: Lifting of modules on site.(Photograph courtesy by DSG Modular)
5.3. Conduct visual inspections of modules delivered to site
Visual inspections should be conducted by an engineer’s representative to ensure there are no defects to the modules during transportation, prior to moving the modules to their designated location for installation.
5.4. Mark and set out modules’ position
The positions of the supporting rods on the modules, as shown in the BIM drawings, can be marked out on the slab soffit or columns using laser marker equipment. This will ensure faster and proper alignment of supporting rods with module frame eyelets as well as connections between modules.
5.5. Install and connect modules and to the mains
The installation of MEP modules should be carried out by workers who are familiar with the connection details of the modules, and have been trained by the MEP prefabricators.
Figure 15: In Korea, prefabricated MEP modules are connected on the floor at the job site and lifted as a complete module for final installation.
Synchronised wireless jacks are used to maintain alignment when lifting the module.
(Photograph courtesy of Hyundai Engineering & Construction Pte Ltd)
5.6. Testing and commissioning
A testing and commissioning plan should be developed and the Qualified Person (QP) or his representative should be present to witness the testing and commissioning of the MEP system.