Improved of the Pull Out Force of the Concrete Anchor Bolt
| Project/Area Number |
10555036
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
機械工作・生産工学
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| Research Institution | Tokyo University of Agriculture & Technology |
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Principal Investigator |
NISHIWAKI Nobuhiko Tokyo Univ. of Agri. And Tech., Faculty of Tech., Professor, 工学部, 教授 (90016626)
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| Co-Investigator(Kenkyū-buntansha) |
HASEGAWA Tadashi Tokyo Univ. of Agri. And Tech., Faculty of Tech., Professor, 工学部, 教授 (50005328)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 1999: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1998: ¥8,700,000 (Direct Cost: ¥8,700,000)
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| Keywords | Anchor bolt / Inverse tapered hole / Pull out force / Drill / Earthquake / コンクリート・アンカーボルト / 穴あけ工具 |
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| Research Abstract |
Many structures, that is a building, a dam, a bridge, and so on, are made of concrete because the concrete is very cheap and rich.
Many instruments, that is a machine tool, a sign board, a slot vending machine, and so on, are attached to the wall and the floor of these structures. In order to attach these instruments to the wall and the floor , many kinds of concrete anchors are used. In general, a metal anchor is used. A metal anchor is made of steel. The metal anchor consists of an anchor bolt and a cone. When the instruments are attached to the concrete wall and floor using the metal anchor, the metal anchor is inserted to the drilled hole and the head of the concrete anchor is hammered. Then, the bottom end of the anchor bolt is expanded in the drilled hole by the cone and the anchor bolt is fixed in the drilled hole. On the other hand, a great many concrete anchor bolts are happen to be pulled out from the concrete walls and floors easily when the Hanshin-Awaji Earthquake has been occurred at 17th, January, 1995. Many machine tools and instruments are fallen down. So, it is demanded to increase the pull out force of the concrete anchor bolt.
Therefore, in this study, a method for improvement of the pull out force of the concrete anchor bolt has been studied. In this method, the concrete anchor bolt is fixed to wall and the floor using inverse tapered hole, that is the diameter of the hole increases with the depth. In this study, a new tool has been developed in order to make a inverse tapered hole and the pull out force has been measured.
As the result, the following conclusions are obtained.
(1) The new tool to make an inverse tapered hole has been developed. Its inverse taper angle is 10 degree and the depth of the inverse tapered hole is 12 mm.
(2) When the metal anchor is fixed in the inverse tapered hole, the pull out force is approximately 2.8 times larger than that of general drilled hole.
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Report
(3 results)
Research Products
(3 results)
