基于木蜂筑巢习性的古建筑木构件木蜂危害等级划分

doi:10.11707/j.1001-7488.20220318

Abstract

Abstract:

Objective: Carpenter bees nesting on wooden components of ancient buildings brings damage to wooden structures. This study evaluated the carpenter bees damage grade for wooden components in order to provide a basis and an evaluation standard for the investigation and maintenance design of ancient building protection engineering. Method: Balsa woods damaged by carpenter bees were collected, then inspected nest structure by endoscopy and CT. Then the wood was cut through to observe the nest cell structure. Damage degree of wood structures was converted by tunnels volume and nest size. Result: The carpenter bee collected in this study was identified as Xylocopa(Koptortosoma) appendiculata. The endoscope could observe the main tunnel, and it could be found that the tunnel had 2-3 branches. CT scanning could provide an accurate understanding of nest structure. By dissecting the nests, it was found that the most nests of X. appendiculata were two parallel tunnels in two sides perpendicular to the entrance hole or two tunnels on one side and one on the other side. The average internal diameter of the tunnel was 1.55 cm, and the average length was 14.4 cm. The average of tunnels volume of each nest was 133.67 cm³. and the average of nest volumes was estimated at 1 436.58 cm³. Conclusion: The damage of carpenter bees in ancient buildings generally occured on the non load-bearing and independent wood components such as rafters, roof boarding or brackets. In order to estimate the degree of damage, this study evaluated the carpenter bee damage grade as 1-4 rate based on nesting habits: the wood component is found only one hole, it is classified as class 1 damage; when 2-3 holes are found, it is classified as class 2 damage; when 4-5 holes are found, it is classified as grade 3 damage; when more than 6 holes are found, it is classified as class 4 damage.

Key words: wooden structure of ancient buildings, carpenter bee hazard, nesting habits, damage rating, disease survey

CLC Number:

S781.7

Xingxia Ma,Lin Wang,Yunfei Qiao,Enze Duan,Yi Lu,Xuan Fang,Bin Zhang,Yanhua Wang,Qijun Jin. Evaluation of Damage Grades for Wooden Components of Ancient Buildings Based on Nesting Habits of Carpenter Bee[J]. Scientia Silvae Sinicae, 2022, 58(3): 167-174.

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References 0

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巢穴编号 Nest No.	分枝数 Number of branches	巢穴构造类型 Nest structure	隧道内径 Inner diameter of tunnel 最大/最小 Min./Max./cm	隧道容积 Volume of tunnel/mm³	巢穴外围跨度 (长、宽、深) Span of nest (length, width, depth)/cm	巢穴体积 Size of nest/cm³	巢穴平均大小 Average of nest size/cm³
1	4	A型A type	1.45/1.60	95.39	28.70, 6.00, 6.00	1 033.20	1 428.64
2				117.92	34.00, 7.00, 6.00	1 428.00
3				198.53	33.00, 7.00, 6.00	1 386.00
4				178.99	32.50, 6.40, 6.00	1 248.00
5			1.45/1.70	127.60	33.00, 6.00, 6.00	1 188.00
6	3	B型B type		102.85	29.00, 6.00, 6.00	1 044.00	1 261.65
7				119.48	37.10, 6.00, 6.00	1 335.60
8				96.46	34.00, 7.00, 6.00	1 428.00
9				95.37	29.50, 7.00, 6.00	1 239.00
10	5	C型C type	1.60/1.80	158.20	47.80, 7.00, 6.00	2 007.60	2 007.60
11	> 5	D型D type	1.40/1.82	179.53	25.00, 10.70, 6.00	1 605.00	1 605.00
平均Average			1.55	133.67	33.05, 6.88, 6.36	1 436.58

级别Damage grades	描述Description
1	木构件有仅且有1个木蜂孔洞There is only one hole found in the wood component
2	木构件有2~3个木蜂孔洞There are 2-3 holes found in the wood component
3	木构件有4~5个木蜂孔洞There are 4-5 holes found in the wood component
4	木构件有6个及以上木蜂孔洞More than 6 holes are found in the wood component

Evaluation of Damage Grades for Wooden Components of Ancient Buildings Based on Nesting Habits of Carpenter Bee

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