Quantitative Analysis of Waiting Length and Waiting Time for Frame Construction Work Activities Using a Queue Model; Focusing on Korean Apartment Construction

Abstract

The frame construction of an apartment complex that consists of multiple buildings encounters various uncertainties, owing to the complex relationships between units of work. Currently, the period of such a construction is calculated based on the number of floors of the highest building in the complex. This study quantitatively analyzes an apartment frame construction period using a queue model and evaluates the validity of the estimated period. In this regard, a methodology is proposed for analyzing the construction period by applying the concept of a customer and a server. A case study on the duration of an apartment frame construction period is conducted with the Korea Land and Housing Corporation, which has supplied the largest number of apartments in South Korea. It was found that the stable state of a queue system was observed when the rate of server utilization was applied to the basement and above-ground floors. However, a stable state was not reached on the ground floor. This study includes non-working days in its calculation and quantitatively analyzes uncertainty factors during construction. Therefore, the findings can be practically utilized to quantitatively plan the durations of work units in an apartment frame construction.

Enhanced Subcontractors Allocation for Apartment Construction Project Applying Conceptual 4D Digital Twin Framework

“…Ham et al [42] conducted a study on the problem of determining the optimal number of BIM staff based on the RFI obtained through BIM-based design validation from an economic point of view. Kim et al [43] modeled the frame construction process to optimize the construction period of an apartment construction project and evaluated the expected construction period through the queueing model. As such, the queueing model can be used as a tool to support decision making on optimal resource management by quantitatively analyzing the state of the system according to resource allocation.…”

Microscopical Resource Allocation for Large-Scale Apartment Foundation Work Using Queuing Systems

“…Cho and Choi [24] analyzed 10 apartment projects in South Korea and found that framework construction accounted for approximately 57%, 27%, and 27% of the total construction period, construction cost, and direct construction cost, respectively. Furthermore, because large-scale apartments include multiple buildings, framework construction exhibits complex relationships between activity units [25]. Moreover, because frame construction utilizes underground spaces for parking lots and community facilities, such spaces are of high importance in South Korean apartments [18,26].…”

“…Because an estimated 120 m 3 can be processed per hour by each server, there is sufficient room for processing the planned daily volume. Zones 2,4,7,9,18,19,20,21 + 22,[23][24][25][26][27][28][29], like Zone 1, comfortably allow the concrete pouring server team to handle their daily workload. ρ in zones 3, 6, and 12 is less than 1.0, indicating that stable services can be provided.…”