松江唐经幢文物勘察技术研究

Research on relics exploration technology of Tang’s Buddhosnisah Dharani Pillar in Songjiang

松江唐经幢,全名“佛顶尊胜陀罗尼经幢”,为全国重点文物保护单位,建于唐代,是上海地区现存最古老的建筑物,具有十分重要的研究价值。唐经幢由于长期的日晒雨淋,出现了一定的程度的损坏,该经幢此前曾进行过修缮,此次修缮需对经幢进行全面的勘察。本次勘察针对经幢的建筑结构形式,采用三维激光扫描技术,采用点云数据构建了经幢的各个立面及三维模型,并根据各个切面形心的相对位置计算幢身整体倾斜程度;采样后通过实验室方法对经幢石材和修复材料进行了分析;对目前经幢的损伤情况进行勘察,形成损伤分布图,采用图文并茂的形式对石材的损伤进行展现;采用超声波无损检测法分析了后期修补材料对原有石材强度的影响,最终对经幢现状作出了科学的评价,为后续修缮提供了依据。

Song jiang Tang Jycwhk,full name is Buddhosnisah Dharani Pillar,is the oldest building in Shanghai.It was built in the Tang Dynasty and is the oldest existing building in Shanghai,and has very important research value.The Tangjing Building has been damaged to a certain extent due to long-term exposure to the sun and rain.It has been repaired before,and this repair requires a comprehensive survey of the Jingjing Building.According to the architectural form of the Jingzhu,this survey uses 3D laser scanning technology,and uses point cloud data to construct each facade and 3D model of the Jingzhu,and calculates the overall inclination of the building according to the relative position of the centroid of each section.Laboratory methods were used to analyze the stone and repair materials of the Jingzhu;the current damage of the Jingzhu was investigated,the damage distribution map was formed,and the damage of the stone was displayed in the form of pictures and texts;the ultrasonic nondestructive testing method was used to analyze the damage of the later repair materials to the original.Influenced by the strength of the stone,a scientific evaluation was finally made on the current situation of the Jingzhu,which provided a basis for subsequent repairs.