随着社会主义建设的发展,需要大量木材,用于建筑结构的针叶树木材就显得更加珍贵了。但另一方面,我国产量较多的阔叶树木材,由于存在一些缺陷而未很好的得到应用。如果利用胶合结构的优点、克服其缺点,即可以扬长避短扩大树种的应用。本文就是从产量丰富而缺陷又较明显的桦木开始着手研究的。 With the development of socialist construction, a lot of wood is needed, and coniferous wood used for building structures is even more precious. However, on the other hand, China’s hardwood species, which have more yield, have not been well applied due to some deficiencies. If you take advantage of the advantages of glued structures and overcome their shortcomings, you can increase the use of trees by avoiding them. This article started from the birch which has abundant production and obvious defects.