| Summary: | 碩士 === 國立雲林科技大學 === 營建工程系 === 107 === Domestic construction sites use different types of scaffolds as facade scaffolds,
such as door-type scaffolds, tube and coupler scaffolds, and ring-lock scaffolds,
depending on the site environment and financial conditions. In order to match the
external shape change of the building and increase the working space for the
convenience of construction, door-type scaffolds with two-bay setup are often used only
the outer cross brace. Tube and coupler scaffolds are currently used for special
structures such as petrochemical plants and power plants. Domestic research on this
aspect is rare, lack of design reference materials and the setup are mainly based on
workers' experience. Ring-lock scaffolds has been import from abroad recently, and its
joints are special. Ring-lock scaffolds are becoming more and more common in Taiwan.
Therefore, it is necessary to establish an analysis and design reference materials for the
impact factors of joints. For above three types of facade scaffold, a series of common
construction setup are planned to experiment the ultimate load capacities and failure
mode of different structural setup in this research.
According to the test results, door-type scaffold with two-bay can set up outer and
inner sides as two-sides cross brace if it needs working space. The load capacities of
door-type scaffold with two-bay with two sets of cross brace is 0.88 times of that of the
one with four sets of cross brace. Door-type scaffold set up work board helps to increase
whole structural load capacities to about 20%. Between the bay of door-type scaffolds
with two-bay is recommended to use the 8-clamp. The second time load capacities of
door-type scaffolds is about 0.8 times more than the first time.
The failure mode of the tube and coupler scaffolds are the whole system to
buckling.Tube and coupler scaffolds vertical member used splicer will reduce the whole
system load capacities by about 20%.The large scaffolding tube of the tube and coupler
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scaffolds should be locked on the "horizontal member", which can improve the whole
system load capacities by about 27%.The tube and coupler scaffold can set up work
board to increase the whole system load capacities by about 5%.The second time load
capacities of tube and coupler scaffold is about 0.7 times more than the first time.
The results of the impact factor experiment of the ring-lock scaffolds show that the
looser allowance ane the smaller insertion depth between the main pipes’s joint resulted
in decreased load capacity, and the insertion depth influence more than allowance.The
main pipes connect with the base jack which joint is looser allowance or smaller
insertion depth decreased load capacities. The main pipes’s joint stiffness is greater,the
load capacity is greater. The ring-lock scaffolds should be reinforced with a diagonal
bracing, which can effectively improve the whole load capacities by about 1.6 times.
The above experimental research data can be provided for second-order analysis for
reference.
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