טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentYona Efraim
SubjectFactors Affecting the Selection of Forming Systems and
other Major Equipment for Multistory Building
Construction
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Aviad Shapira
Full Thesis text - in Hebrew Full thesis text - Hebrew Version


Abstract

Selecting construction equipment for a project is one of the main functions of the construction project planning. Multistory buildings typically involve three main groups of equipment: forming systems, cranes, and concrete pumps. The added value of matching the equipment to the project is especially high in multistory buildings compared with other types of buildings due to the repetitive nature of the construction process.

The present research focused on the identification and analysis of selection factors in multistory buildings, the extent and nature of their impact on the selection process, and the reciprocal relations between them. Another objective of the research was to develop a structured graphic template for the presentation of the set of selection factors in multistory buildings.

The methodology used in the research consisted of case studies that were based on interviews. Fifteen projects of multistory buildings of 30 stories or more were chosen. This minimum requirement was determined since advanced forming solutions such as crane-free self-climbing forming systems for the casting of the building core are not customarily even considered for use in lower buildings.

The case studies exposed many factors in the selection of major equipment for multistory building projects, and their integration with the knowledge gathered from the literature review led to the creation of a structured library of selection factors.

Another main product of the research was the development of a selection diagram to serve as a visual tool that presents a concise picture of the decisions made in the selection of the forming system and other major equipment used in the construction of multistory buildings.

The research also exposed a series of findings related to multistory buildings, among which are: (1) self-climbing forming systems were implemented in buildings of 40 stories and more (not 30 as appears in the literature), unless the construction company was already in possession of a system from previous projects; (2) there was a clear tendency to minimize the number of times form panels were lowered - both to save expensive crane time and to solve the problem of site congestion; (3) distinct use of peripheral protection screen systems in all buildings with open envelopes has been evident (4) high disassembly costs of tower cranes that climb within the building have led to an increasing tendency to position the crane outside of the building, even at the cost of having to use very high towers and even on congested sites.