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随着重大基础设施建设的不断发展,跨越江河湖泊以至海洋的水上施工项目也越来越多.在桩基础施工项目中,采用循环钻机或者冲抓钻机等形式进行水面施工的案例已经很多,但是采用旋挖钻机进行水面钻孔作业却鲜见报道.其主要原因在于,这种水上施工项目中的桩基础设计形式多数都是大直径、深孔桩,旋挖钻机在进行该类桩的施工时,要面临钻机扭矩、钻杆规格、钻具形式以及钻孔护壁等各种因素的限制和考验,因此目前国内采用旋挖钻机进行大直径深孔桩水上施工的案例尚不多见. 相似文献
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基于SH36W型多功能钻机的现有成型技术,研制出SH36W-C80液压铣削深搅成槽机。该设备集铣、和提升过程中通过两个铣轮的旋转,削、搅拌三种功能于一体,在掘进辅以高压气浆的升扬置换作用充分搅拌土体和固化剂,制成由基土、水、水泥(固化剂)等组成的矩形桩(墙)体,填补了国内地连墙施工机械领域的一项空白。该设备结合原有液压双轮铣槽机和传统深层搅拌技术,具有整机稳定性好、地层适应能力强、施工深度深、成墙效率高、工程造价低等优势,可应用于地基加固、防渗墙及挡土墙等地连墙施工,具有广阔的应用前景。 相似文献
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It is well established that the glomerular capillary wall consists of three layers: endothelial cell, glomerular basement membrane, and the slit diaphragm bridging foot processes of glomerular epithelial cell. Which structure in the glomerular capillary wall represents the primary filter for retaining plasma proteins is not clearly elucidated. An anti-slit diaphragm monoclonal antibody (mAb) 5-1-6 causes massive proteinuria in rats by single intravenous injection, which clearly indicates that the slit diaphragm plays a critical role for maintaining the barrier function of the glomerular capillary wall. Recently, we concluded that mAb 5-1-6 recognized a rat homolog of nephrin, a gene product of NPHS1. The expression of nephrin decreased in puromycin aminonucleoside nephropathy and adriamycin nephropathy as well as mAb 5-1-6-induced nephropathy, which suggested that nephrin was involved in the development of proteinuria in these proteinuric states. In mAb 5-1-6 nephropathy, the slit diaphragm was maintained morphologically normal, although nephrin expression dramatically decreased. The finding suggested that nephrin was not a sole component of the slit diaphragm. To better understand the structure of the slit diaphragm, it is particularly important to identify other components that build up the structure of the slit diaphragm together with nephrin. 相似文献
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Unsteady flow and diaphragm motion in the phoenix artificial heart were studied using a CFD solver combined with an in-house
developed FEM code. In diastole, the initially egg-shaped diaphragm deflates and forms two large depressions on the two sides
and a small one on the round part. Vortices form in the blood chamber. In systole, the diaphragm inflates and pushes the blood
to flow out through the opened outlet. The wall shear stress distribution is also strongly dependent on the flow field as
well as the diaphragm motion. 相似文献
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本文叙述了国内外铁道车辆中应用的四种橡胶膜板的结构及其特点,测定了S形和碗形膜板的性能,分析了影响S形膜板有效面积的因素,为合理设计膜板深度提供依据。 相似文献
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螺杆钻具作为一种以钻井液为动力的工具,目前被广泛地应用于石油钻井施工过程中。与普通的螺杆钻具相比,等壁厚螺杆钻具作为一种新型的钻具,其在性能、技术以及使用效率上具有一定的优势,并得到了广泛的推广。阐述了等壁厚螺杆钻具的结构特点及其优势,并分析了等壁厚螺杆钻具在现场中的实际运用效果。 相似文献
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讨论了小孔内壁喷丸强化加工装置的喷射运动机构的设计研究,提出了依据孔内壁全区域喷丸强度的均衡性的要求,确定喷丸装置和反射装置运动速度的设计思想,并给出了两种类型的结构设计。 相似文献
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水下大功率振源体工作一段时间后膜板中心附近位置出现空蚀现象,分析了膜板产生空蚀的原因及空蚀相关理论,通过提高材料抗空蚀性能和阴极保护两种方法来减轻空蚀破坏.提高材料抗空蚀性能包括改变材料、增加壁厚和提高表面粗糙度;阴极保护采用喷涂无机富锌涂料. 相似文献