共查询到18条相似文献，搜索用时 593 毫秒
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文章结合跨径20m预应力空心板预制的施工管理实践，介绍预应力空心板内模变换的一种方法及施工工艺。 相似文献
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先简支后连续结构,不仅具有简支梁桥施工简便的优点,而且保证桥梁的行车平顺。本实验基于预应力空心板先简支后连续的结构特征和受力特点,进行荷载试验和极限承载能力的加载试验,同时与预应力简支空心板作对比试验。试验结果表明,先简支后连续结构明显优于桥面连续的结构。 相似文献
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结合黑龙江科技学院第一实验中心工程中SP板的应用实例，介绍了SP预应力空心板的优良性能和制作工艺。并通过与普通预应力空心板的对比，分析了SP板在结构、性能、施工工艺方面的优缺点。 相似文献
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嵩待高速公路七合同段K62＋111（3—20）桥为先张法预应力钢筋混凝土空心板梁桥。本文以此为切入点，详细阐述二横梁槽式台座内预应力钢绞线单股逐根张拉设备及夹具选用、铜绞线张拉前的准备工作、张拉的步骤和方法、钢绞线放张和切断的原则及顺序等。分析先张法预应力钢筋混凝土空心板在施工过程中台座、张拉设备、控制应力及张拉程序等质量控制问题。就现场施工过程中出现的钢绞线磨损严重、夹片损坏严重、钢绞线实际伸长值达不到要求、钢筋混凝土横梁开裂、空心板预拱度无法达到要求等这些关键性问题的解决补救措施进行简要分析。 相似文献
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在预应力空心板冬季“蒸养”过程中，混凝土初期养护管理、升降温梯度、板粱上下散热速度差以及梁内是否配置防裂钢筋等都将对粱的浇注质量产生影响，本文以伊嘉公路五汤段的预应力空心板粱为例，对粱的“蒸养”裂纹作了详细分析，提出了相应的防范措施。 相似文献
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对大跨度预应力空心楼盖的施工抗浮问题，从施工过程的发生、发展以及抗浮的受力分析、抗浮的处理方法等作了深入的研究，对该类问题的施工解决提出了新的可行的办法。减少了施工的盲目性，减少了大跨度通情达理应力空心楼盖抗浮施工时各种质量问题的发生，填补了“空心管＋预应力”技术在施工应用方面的一项空白。 相似文献
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对大跨度预应力空心楼盖的施工抗浮问题,从施工过程的发生、发展以及抗浮的受力分析、抗浮的处理方法等作了深人的研究,对该类问题的施工解决提出了新的可行的办法.减少了施工的盲目性,减少了大跨度通情达理应力空心楼盖抗浮施工时各种质量问题的发生,填补了"空心管+预应力"技术在施工应用方面的一项空白. 相似文献
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司琳琳 《林业机械与木工设备》2012,(4):25-28
在传统蜂窝纸芯单元的粘结处添加一块中密度纤维板支撑条加工成木质材料强化蜂窝纸芯,然后分别将蜂窝纸芯与中密度纤维板及薄、厚胶合板覆贴形成木质材料强化蜂窝纸芯复合板。比较了三种覆面材料制成的空心板多项力学性能并分析了他们的破坏模式。 相似文献
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Summary This paper highlights a number of articles on research and development on wood composites. The coefficient of variation in the mechanical properties of wood components tends to decrease when the thickness of the wood elements decreases. This finding was utilized in the manufacture of hollow cylindrical columns of laminated veneer lumber (LVL) from Cryptomeria plantation thinnings. In the future, the marketing of wood composite boards will tend toward two types: thick boards with low density properties and thin boards with fiber orientation. For the production of thick boards, fundamental parameters and application of steam-injection pressing have been studied, and continuous steam-injection pressing has been developed. For thin board production, generation principles of aligning torque in high-voltage system and the application has been studied. A new oriented mat former with electrodes positioned only at the reverse side of a forming belt has been developed. Various synthetic resins of low-molecular weight have been applied to improve dimensional stability of laminated products, such as LVLs and particleboards. Acetylation and formalyzation of fibers and particles were investigated to provide stabilized panels. High pressure steam treatment during pressing of wood composites has been studied and the process has been found effective and promising.The authors wish to thank Mr. Dwight A. Eusebio for his help in the preparation of this paperThis paper was presented at the IUFRO All Division 5 conference in Nancy, France, on August 15, 1992 相似文献
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本文介绍了林区建筑管道的施工测量,测量前的准备工作;开槽施工,槽口放线,埋设坡度板,放样坡度钉,顶管施工,设置中线桩,设置中心钉和水准点等。 相似文献
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Sound absorption capability and mechanical properties of a composite rice hull and sawdust board 总被引：1，自引：0，他引：1
Chun-Won Kang Seung-Won Oh Tae-Bong Lee Wook Kang Junji Matsumura 《Journal of Wood Science》2012,58(3):273-278
Rice hull–sawdust composite boards were manufactured for sound-absorbing boards in construction. The manufacturing parameters were target density (400, 500, 600, and 700?kg/m3) and rice hull content as percent weight of rice hull/sawdust/phenol resin (10/80/10, 20/70/10, 30/60/10, and 40/50/10). Commercial gypsum board and fiberboard were also used as comparative sound-absorbing materials. The average modulus of rupture (MOR) of the board with a density of 700?kg/m3 and rice hull mixing ratio of 10% was 8.6?MPa, and that of the board with a 400?kg/m3 board density and a rice hull mixing ratio of 40% was 2.2?MPa. The MOR increased with increasing board density or decreasing rice hull mixing ratio. The sound absorption coefficients of some boards (400?kg/m3 and 10%, 500?kg/m3 and 30%, and 500?kg/m3 and 40%) were better than those of the commercial 11-mm-thick gypsum board. Thus, it is concluded that rice hull–sawdust composite boards may be implemented as sound-absorbing barriers in construction due to their high sound absorption coefficients. 相似文献
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胶合木结构建筑中,柱作为轴心受压构件,需要对其承载能力进行强度和稳定性验算。对空心柱进行理论设计计算,从而确定一定尺寸、规格下柱能承受的最大载荷。由于没有专用设备进行实验论证,本研究仅对不同规格的空心木柱和实心木柱进行对比,得出了在保证空心木柱强度与实心木柱相当时,空心木柱的外围直径与实心木柱相比均有一定程度扩大的结论,从而使胶合木结构中的胶合木柱达到了美观与结构的双向要求。同时提供了几种具体空心木柱的外观设计。 相似文献