柳杉直交板應用於複合工字樑之製造技術探討

Investigation on the Manufacturing Techniques of Composite I-beams in Cross Panel Using Cryptomeria japonica

葉民權(Min-Chyuan Yeh) ； 蔡浩章(Hau-Jang Tsai) ； 林玉麗(Yu-Li Lin)

《林產工業》 28卷3期 (2009/12) Pp. 189-202

摘要

為提高木材之利用率，本研究利用國產造林木柳杉之低品質或短料進行研製直交板，並探討作為樑腹材料，應用於複合工字樑的可行性，所研製之直交板符合E50-F160之抗彎等級。複合工字樑以結構用單板層積材作為梁翼，採用24及36mm厚柳杉直交板作為樑腹，在用膠的情況下分別探討舌槽接合、自攻螺絲接合、及指榫接合之組合加工技術。實大尺寸之工字樑經三分點抗彎試驗得知，直交板作為樑腹與實木樑腹之工字樑具有相同之承載性能，其中指榫接合優於舌槽接合及自攻螺絲接合工字樑約16及18%。建議舌槽接合之嵌合度可為-0.1mm，指刀排列為並排進行切削可得較正確之指端寬，同時直交板作為樑腹時，可以面板木理方向平行工字樑長軸方向進行組合。

關鍵字

直交板 ； 自攻螺絲接合 ； 指榫接合 ； 舌槽接合 ； 木質複合工字樑

並列摘要

The cross panel was developed from low quality sawn lumber or trims of domestic plantation timber of Japanese cedar to improve the wood utilization, and used as web materials after proper processing procedures to investigate the feasibility on the composite I-beam application in this study. The bending performance of cross panels could meet the requirement of E50-F160 grade. The composite I-beams consisted of structural laminated veneer lumber as flanges and 24- or 36-mm thick cross panels as web materials. The assembly techniques included tongue and groove joint, coach screw assembly, and finger joint were developed and investigated with the glue application between the flange and web interfaces during the I-beam fabrication. Similar bending load capacities of I-beams fabricated with cross panel and solid wood web were found through the four-point bending tests on the full-size specimens. There were 16 and 18% higher in bending capacities for the I-beam assembled in finger joint than those in tongue and groove joint and coach screw assembly, respectively. It is suggested a fitness of-0.1mm between the tongue and groove processing, finger knife arranged in a row during the finger formation, and the cross panel aligned with grain of face layer parallel to the long axis of I-beam during fabrication.

並列關鍵字

Cross panel ； Coach screw joint ； Finger joint ； Tongue and groove joint ； Wood composite I-beams