COMPARATIVE STUDY OF BILL OF QUANTITY PLANNING AND ACTUAL WORK MECHANICAL, ELECTRICAL AND PLUMBING CONSTRUCTION OF HOSPITAL BUILDINGS

ABSTRACT


INTRODUCTION
The development of knowledge and technology in the world of Civil Engineering is increasingly advanced and growing(Chen, Merrett, Liu, Fauzia, & Liem, 2022). In this Digital Era, there are many new discoveries in digital methodology and technology from planning to direct practice in the field(Hai, Van, & Thi Tuyet, 2021). In the construction industry, MEP or Mechanical, electrical, and Plumbing is one of the important factors to realize a building or building whose installation system is safe and quality (Osburn, Lee, & Gambatese, 2022).
MEP itself is an expertise to plan, design, and regulate mechanical, electrical, and piping systems in a building(Hietala, 2022). The operation of multi-storey buildings certainly requires considerable electrical power, therefore in the process of distributing electrical power must be calculated and done as well as possible to achieve maximum results(Ofetotse, Essah, & Yao, 2021). Coordination of mechanical electrical and plumbing system design planning specifically is critical to the success of the project (Tillmann, 2020).
The MEP system affects about 40 -60% of the construction cost of a building, ranging from one floor to tall buildings(Molina Hutt et al., 2022). In general, the MEP system consists of vertical transportation systems, electrical systems, clean water networks, rainwater and waste disposal networks, venting systems, wifi networks, lightning protection systems, telephones, sound systems, fire protection, CCTV systems, computer networks and others.
The hospital is one of the buildings that has an important and critical role for the community(Angelakis, Antoniou, Yapijakis, & Tchobanoglous, 2020). In hospital buildings, MEP network installation is a mandatory and important factor for the functioning of the

METHODS
The method used in this study is a quantitative / concrete method. Research procedures are carried out by collecting, analyzing, and processing data obtained in a study to understand research problems.
The quantative method is carried out by surveying questionnaires with respondents who have knowledge and experience in MEP work, so that factors that cause differences in the volume of work that occurs during planning can be determined with those realized in the field. As well as collecting data related to the calculation of the volume of work or BoQ as well as the calculation of the estimated cost of the General Hospital construction project. After that the data is processed and analyzed using conventional methods by means of manual calculations with the help of Microsoft Excel software, to identify comparisons between BoQ planning and those realized in the field, as well as comparisons of cost estimates.

RESULTS AND DISCUSSION
After comparing BoQ, MEP work, planning and actual work in the field, a difference of 5.74% was found with a price difference of Rp 571,816,261.08. Changes in the volume of work itself are most commonly found in wiring and piping work in SDP systems and power panels, lighting systems, air conditioning, telephone installations, cctv, matv, fire extinguishers and fire alarms, elevators, lightning rods, hydrants, sprinklers, and fire extinguishers, as well as piping systems. As for determining the most influential factors in BoQ changes , planning and actual in the field, a questionnaire distribution was carried out by 30 respondents in project X(Alshihri, Al-Gahtani, & Almohsen, 2022). From the distribution of the questionnaire, the results of filling out the questionnaire were obtained as in table 4 below(Fauziati, Minovia, Muslim, & Nasrah, 2020).