系統施工架之接頭力學行為及其影響因子探討

Mechanical Behavior and Impact Factor of the Joints of System Scaffold

本系統施工架為一臨時性結構構材，相較於框式施工架，具有高承載力、組搭容易且快速的特性。這種施工架早期即為歐美日等先進國家在營建工程上普遍使用的臨時支撐結構構材。國內工程界近年才引進或仿製國外系統施工架使用。由於對系統施工架相關元件之力學行為未能充分掌握，而該等元件力學行為資訊又極度缺乏，致使系統施工架在設計使用時常有誤差而發生倒塌。系統施工架相關元件有主桿、橫桿、斜桿、調整座等，施工時可依照工程環境之實際需求，任意組搭成臨時結構。這種施工架結構含有多類接頭，而這些接頭正是影響系統施工架結構性能的關鍵因子，因此對施工架結構力性的瞭解，可從各式接頭力學行為著手，研討各種接頭連結條件下如插入深度、接合裕度等的強度、乘載力和抗彎勁度等。本研究主要採用試驗方式，探討系統施工架不同接頭之力學行為，以確認系統施工架之主桿、橫桿、斜桿、楔型插銷、扣盤、調整座等元件，與裕度、插入深度、楔型插銷鬆緊度、盤扣銲接強度、各類接頭抗彎勁度等影響因子之間的關係。獲得之試驗結果已可確實瞭解並掌握系統施工架各元件的力學行為。

System scaffold is an element of temporary structure. Comparing with frame-type scaffolds, system scaffolds have the characteristics of high strength and easy and fast installation. The system scaffolds have been formerly widely used as the element of temporary structure in construction in the advanced countries such as America, Japan, Europe, etc. Until recent years, domestic engineering fields have largely imported or replicated these system scaffolds. However, because of the patent of system scaffold in advanced countries, overseas manufacturers of these scaffolds keep the mechanical behavior of the elements of system scaffold as a commercial secret, these mechanical behaviors of the elements cannot be easily collected. This induces occurrence of lots of collapses of system scaffolds in domestic construction fields. The elements of system scaffold include the standard, ledger, diagonal, wedge, ring plate, base screw jack, etc. These elements can be arbitrarily installed as a temporary structure according to the engineering environments. This research adopts the loading tests to explore the mechanical behaviors of various joints of the scaffold systems. These tests can confirm the relationship between the elements of standard, ledger, diagonal, wedge, ring plate, base screw jack and the impact factors of the allowance, inserting depth, wedge relaxation, ring-plate strength, different joint stiffness in system scaffolds. The results of these tests can really verify the mechanical behaviors of different elements of system scaffold.