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本文阐述了中小桥上部结构采用后张法１６ｍ预应力空心板的施工时应注意的问题，如预应力空心板的预制中底模的施工；侧模、蕊模；砼的要求；浇筑空心板的具体步骤。 相似文献
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分析了我国定向结构板国内市场开拓困难的原因,并探讨定向结构板在我国的应用领域和市场的开发前景,提出发展我国定向结构板的几点建议. 相似文献
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国内外定向刨花板研究和发展动态 总被引：6，自引：0，他引：6
本文概述了定向刨花板在国外的发展过程，介绍了国内外近年来定向刨花板工艺技术研究的动向和进展，并对我国发展定向花刨板工业提出了一些建议。 相似文献
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竹材是我国制造OSB的一种潜在原料 总被引：4，自引：0，他引：4
定向刨花板(OSB)是近20年人造板家族中发展最迅速的一种板材。国外已呈现原料供应不足状况。我国OSB制造业正在起步阶段,将来也会面临原料资源问题。我国是世界第一产竹大国,通过分析竹材的理化性质和采用毛竹进行压板试验,结果表明竹材极有可能替代木材成为制造OSB的一种新原料。 相似文献
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Effect of two relative humidity environments on the performance properties of MDF, OSB and chipboard
J. Pritchard M. P. Ansell R. J. H. Thompson P. W. Bonfield 《Wood Science and Technology》2001,35(5):395-403
The static strength, stiffness and fatigue life of MDF, OSB and chipboard have been measured in a 65%RH environment and a
85%RH environment. Chipboard is commonly utilised as a flooring material and OSB is also used in structural applications,
for example floor decking and webs of I-beams. The mean static strengths of MDF, OSB and chipboard at 65%RH were 47.9 MPa,
27.9 MPa and 21.0Mpa, respectively, compared with 34.59 MPa, 21.70 MPa and 10.61 MPa at 85%RH. However, MDF has mostly been
used in non-structural applications, such as furniture, so its resistance to fatigue loads as a structural panel is of considerable
interest. In a 65%RH environment dynamic modulus values showed that whilst MDF and chipboard exhibit similar stiffness values
(4 GPa), OSB is approximately 50% stiffer. However, at 85%RH MDF was the stiffest of the three materials, followed by OSB
and chipboard. The fatigue life performance of all three panel products was markedly lower at 85%RH compared with 65%RH. Overall,
the high RH environment had a noticeably detrimental effect on the MOE (modulus of elasticity), MOR (modulus of rupture) and
fatigue lives of OSB and chipboard. This is attributed to these panels retaining more of the original characteristics of the
original wood, i.e. larger particle sizes (flakes/chips) compared with the homogeneous fibrous composition of MDF.
Received 5 November 1999 相似文献
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ABSTRACTWood structural panels are commonly subjected to short-term accelerated weathering (AW) procedures to determine relative moisture durability for quality control and product development purposes. The panel edges contribute heavily to moisture uptake since edges represent the least resistant pathway for moisture intrusion. In full-size panels, the edge area to total surface area ratio is small, and moisture intrusion is primarily limited to panel faces. When small specimens are used, such as those in AW procedures, the ratio of edge area to total surface area increases and moisture intrusion at the edges may dominate, which is referred to as the edge effect. The purpose of this study was to determine if physical and mechanical properties of oriented strand board (OSB) and plywood after AW are influenced by specimen size. Specimen width was varied while thickness and length remained constant to understand if edge effects were present in small specimens with different edge area to total surface area ratios. Three AW procedures were evaluated to determine if the effect of specimen size depends on weathering method. No clear effect of specimen size on physical and mechanical properties of either composite type was found. Differences in flexural properties between specimen widths were observed for unweathered OSB, but similar property retention between specimen widths after AW indicated the same trend as the unweathered control. Plywood results were influenced by natural defects, resulting in high variability and absence of statistically significant differences. Lateral nail resistance connection properties of both OSB and plywood were highly variable for all treatment groups and were unaffected by weathering. 相似文献
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George I. Mantanis Eleftheria Th. Athanassiadou Marius C. Barbu Kris Wijnendaele 《Wood material science & engineering》2018,13(2):104-116
In this work, the adhesive systems used today in the European industries of particleboard, medium density fibreboard (MDF) and oriented strand board (OSB) are discussed. The structure of particleboard, MDF and OSB markets in Europe in relation to the types of adhesives and product specifications are presented as well. It is noticeable that new markets for wood-based panels like particleboard and fibreboard, known as non-furniture markets, are growing in Europe at a fast rate. It was concluded that most of the technological changes concerning the adhesive systems applied and additives have been realised from the need for niche panel products, the obligation to reach even lower formaldehyde emissions, and the necessity to decrease production costs due to the stringent competition in the market of wood-based panels. 相似文献
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喷蒸热压新工艺技术及其在国内外人造板工业中的应用开发 总被引：2，自引：0，他引：2
喷蒸热压技术是近10余年来国际上发展起来的一种人造板生产新工艺,是当代热传导技术、计算机控制技术综合应用于人造板工业的高新技术成果。国外已有利用这种技术压制刨花板、定向结构板、中密度纤维板和一些非木质人造板的成功范例;国内也有一些厂家和院校正在研究和试制喷蒸热压机,并取得了初步的成绩。它的推广应用必将对我国人造板工业的发展起到积极的作用。 相似文献
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本研究主要是人造板应用于软体沙发内结构框架的可行性分析,通过沙发内结构框架角部接点及整体强度的力学试验与分析,得出的结论是18mm厚的多层板和OSB完全可以应用于软体沙发内结构框架的生产制作. 相似文献
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水杉脲醛树脂胶定向刨花板的研究 总被引：1，自引：1，他引：1
利用水杉木材制造定向刨花板（ＯＳＢ），既是水杉高效利用的途径之一，又为ＯＳＢ拓展了原材料来源，为ＯＳＢ的发展提供了条件，本文分析了水杉木材与制板工艺有关的物理，力学，化学性质，研究了水杉材ＵＦ胶ＯＳＢ的生产工艺，试验结果表明，利用水杉木材生产ＵＦ胶ＯＳＢ是完全可行的，只要工艺参数选择合理，产品性能可达或过欧共体ＵＦ胶定向刨花板标准要求。 相似文献