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Seven thousand years ago, our ancestors began building wooden nests. From the dawn of civilization during the Xia and Shang dynasties, to the grandeur of the Weiyang Palace during the Han Dynasty, from the Daxing City of the Sui Dynasty to the majestic Mingtang during the reign of Empress Wu Zetian in the Tang Dynasty, from the "Yingzao Fashi" of the Song Dynasty to the prosperity of the Forbidden City during the Ming and Qing Dynasties, Chinese wooden structures carry the legacy of millennia of civilization and grandeur.
In 2020, during the fight against the COVID-19 pandemic, we witnessed the rapid response of prefabricated and assembled buildings, and realized the importance of a healthy, comfortable, and livable high-quality living environment to human health. Breathing green buildings will have a positive impact on humanity. With the advancement of science and technology, modern wood treatment technologies for fireproofing, corrosion prevention, and insecticide prevention are becoming increasingly sophisticated. Glulam has now been adopted for mid-rise, long-span timber structures. A development environment has initially taken shape in China, with a relatively mature industrial chain and relatively well-regulated development. Glulam structures, with their innovations and technologies, are bringing lasting, positive impacts to the construction industry.
Glue-laminated timber (GLT) is a wood product made by gluing together plies of glulam no thicker than 45mm along the grain. It can be used for door and window lintels, primary and secondary beams, columns, and heavy-duty trusses. Glue-laminated timber can be customized. Common glulam options include high-quality Douglas fir, red pine, and Finnish wood, as well as affordable Scots pine. Glue-laminated timber requires a relatively high material grade and is made from oven-dried lumber.
During the production process of glulam components, optimized assembly is performed based on the grade of the plies, allowing for optimal use of inferior materials. High-grade plies are used in areas requiring high strength (such as the edges of tension zones), while low-grade plies can be used in areas of low stress (such as near the neutral axis). Wood containing knots, which generally have a lower strength grade, can be used in areas of compression or near the neutral axis where stress is lower. Furthermore, the cross-sectional shape of the component can be tailored to the load conditions, even allowing for curved or arched glulam beams. The advent of glulam has greatly improved the utilization of timber resources.
Glulam not only retains the desirable natural properties of solid sawn timber, but also overcomes the drying difficulties, natural defects, cracking and deformation, and poor dimensional stability often associated with large-section natural timber. It utilizes wood more efficiently, offers higher structural strength, improved fire resistance, and creates aesthetically pleasing architectural designs. It is widely used in public buildings such as libraries, schools, visitor centers, and swimming pools. Glulam is stronger and stiffer than other structural materials of similar size, yet weighs only one-fifth to one-quarter the weight of concrete of the same volume. This allows for spans exceeding 20 meters without the need for intermediate supports, creating exceptionally large spaces. Regarding fire resistance, glulam is typically used in large sections in heavy timber structures, where fire resistance relies on a carbonized layer formed on the wood's surface during combustion, slowing the burning process. Heavy timber structures utilize large-section engineered wood materials, which retain their strength longer than metal in fire. At the same time, due to the flexible specifications of glulam products, high degree of factory prefabrication, high construction efficiency, and ease of repair and relocation, it is more suitable for the field of prefabricated buildings.
Jinbosheng glued wood and craftsmanship
Qualified glulam products are completed through the following processes: material selection, cutting, finger-jointing, planing, gluing, curing, mortise and tenon notch processing, polishing, quality inspection, and packaging. Jinbosheng's glulam products have a moisture content of 8%-15%, and the thickness is no more than 45mm (no more than 40mm for hardwood species). The difference in moisture content between adjacent boards does not exceed 3%. At the same time, the surface finish and temperature of the plywood, as well as the ambient temperature and humidity of the assembly site, are controlled according to the characteristics of different adhesives. All control data for each batch of glulam products is archived and available for review. The company has a complete and rigorous gluing quality control system and has been successively selected as a "high-tech enterprise" and a "prefabricated building industry base." At the same time, focusing on the characteristics of traditional mortise and tenon joints and modern large-scale structural nodes, the company has formed strategic partnerships with domestic and foreign design teams and pioneered the establishment of a timber structure engineering research center to achieve continuous improvement.
Jinbosheng adheres to the corporate spirit of "being enterprising and striving for progress", and strives to provide high-quality products to customers and improve processing accuracy and efficiency. In recent years, the company has invested heavily in the introduction of world-leading wooden structure construction production lines such as Germany's Hundegger K2i and Germany's Schmidler S6 Plus. At the same time, it has introduced Italy's Biesse Rover A 1359 ATS small beam, column, door and window processing center (with an accuracy of ±0.2mm) and HC24 straight and special-shaped beam glue splicing machine to meet international standards of production technology.
Source: National Innovation Alliance for Wood Structure Industry