3D laser scanning and geometric modeling of Suichang gold mine of the Ming Dynasty in Zhejiang Province

It is believed that folding-arch is the transitional form from beam to curved arch. Guyue Bridge, built in JiaDing 6year (A.D 1213) of Southern Song Dynasty, located in Yiwu City, Zhejiang Province in China, is one of typical objective examples for this transition. It possesses high historical, scientific, artistic, cultural and social values. Facing severe environmental problems and deteriorated heritage situation, our conservation team selected 3D laser scanning as basic recording method, then acquired the precise threedimensional model. Measured the fundamental dimension and components’ sizes, we analysed its stable state. Moreover, combined with historic documents, we reasonably speculated and calculated the original sizes and important scales at the building time. These findings have significant research values as well as evidential meanings for future conservation.

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Measurement of erosion state and refractory lining thickness of blast furnace hearth by using three-dimensional laser scanning method

Metallurgical Research & Technology ◽

10.1051/metal/2020085 ◽

2020 ◽

Vol 118 (1) ◽

pp. 106

Author(s):

Lei Zhang ◽

Jianliang Zhang ◽

Kexin Jiao ◽

Guoli Jia ◽

Jian Gong ◽

...

Keyword(s):

Blast Furnace ◽

Laser Scanning ◽

Refractory Lining ◽

Three Dimensional ◽

3D Laser Scanning ◽

Scanning Method ◽

Blast Furnace Production ◽

Severe Erosion ◽

Residual Thickness ◽

Minimum Depth

The three-dimensional (3D) model of erosion state of blast furnace (BF) hearth was obtained by using 3D laser scanning method. The thickness of refractory lining can be measured anywhere and the erosion curves were extracted both in the circumferential and height directions to analyze the erosion characteristics. The results show that the most eroded positions located below 20# tuyere with an elevation of 7700 mm and below 24#–25# tuyere with an elevation of 8100 mm, the residual thickness here is only 295 mm. In the circumferential directions, the serious eroded areas located between every two tapholes while the taphole areas were protected well by the bonding material. In the height directions, the severe erosion areas located between the elevation of 7600 mm to 8200 mm. According to the calculation, the minimum depth to ensure the deadman floats in the hearth is 2581 mm, corresponding to the elevation of 7619 mm. It can be considered that during the blast furnace production process, the deadman has been sinking to the bottom of BF hearth and the erosion areas gradually formed at the root of deadman.

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