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Treehouse attachment bolts or TABs are specialized bolts engineered for treehouse construction.〔(【引用サイトリンク】title=""INTRODUCING THE XL SYSTEM ©- FINALLY, A TRUE TREE HOUSE MOUNTING SYSTEM"" (see the link to a brochure) )〕〔〔Globe Pequot, "Knack Treehouses: A Step-by-Step Guide to Designing and Building a Safe and Sound Structure", 2010, ISBN 0762763426, (p. 66 )〕 Various models and trademarks exist, with names such as Garnier limbs (GLs); tree anchor bolts; artificial limbs; heavy limbs or hyper limbs (HLs); special tree fastener or stud tree fastener (STFs). They may be either of through fastener style (for smaller trees) or side mount type for larger ones.〔 ==Description== One of the main features of TABs is their strength, requiring fewer tree penetrations for robust fastening of a treehouse and hence less damage to a live tree. A typical TAB consists of a threaded metal bolt and a larger diameter collar. The latter provides an extra bending strength by bearing upon the compression strength of the tree grain.〔 Since treehouses are subject to frequent load reversal produced by winds, TABs must be made of spring steel〔 The bolts are able to support from between 9,000 and 12,000 pounds,〔 a much greater load than conventional lag bolts. TABs are commonly used in conjunction with pipe brackets, allowing the treehouse structure to move independently with the tree.〔(【引用サイトリンク】 title=Pete Nelson – the Treehouse Expert )〕〔(【引用サイトリンク】 title=About Treehouse Masters )〕 TABs are designed so a tree’s added girth can further envelop it.〔(【引用サイトリンク】 title= Bird's eye brew: Treetop tasting room draws visitors )〕〔(【引用サイトリンク】 title=How to Build the Ultimate Treehouse )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Treehouse attachment bolt」の詳細全文を読む スポンサード リンク
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