1) solid-state proposals
固态方案
2) reinforcement scheme
加固方案
1.
Finite element analysis of reinforcement scheme of Changsha dam and its safety evaluation;
长沙坝水库大坝加固方案有限元分析及安全评价
2.
Study on the reinforcement scheme of the slant-legged rigid frame arch bridge;
斜腿刚架拱桥加固方案研究
3) reinforcement plan
加固方案
1.
The cause of the diseases has been found out through the present situation diagnosis,as well as with the theoretical analysis of the original design and the examination result,and the thinking of reinforcement design and the control factors,the four reinforcement plans have been studied,and the plan of a 7 cm integrat.
依据加固设计思路和控制因素,对4个加固方案进行分析研究,选定了7 cm整体化层+4 cm沥青铺装层不增加横隔板的加固方案。
2.
Through the utilization fuzzyoptimal theory, the fuzzy optimal models of bridge reinforcement plan with multi-layer and multi-objective are established, thus the relative optimal membership degrees of plans are got.
运用模糊优选理论,建立了桥梁加固方案的多层多目标模糊优选模型,并应用模糊定权的方法来确定目标的权重,得到各个方案的相对优属度,比较各个方案的优属度选择最优加固方案,并通过一个算例证明其可靠性。
4) reinforcing scheme
加固方案
1.
The characteristic of pit,enclosing structure scheme and supporting system,and reinforcing scheme are introduced one by one in the paper.
本文系统地介绍了基坑的特点、围护结构方案及支撑体系设计和加固方案。
2.
According to the present conditions of the Xigang Bridge,we introduce the reinforcing scheme and the construction technique in detail as well as the construction process after analyzing the reasons of the disable bridge.
分析汉十公路丹江段西岗桥存在的病害现状及原因 ,介绍加固方案、施工技术和施工流
5) reinforcing plan
加固方案
1.
Fuzzy decision of one reinforcing plan;
某工程加固方案的模糊决策
2.
Aiming at the main difficulties and risks of bridges and culverts on haven-built railways,combined with the field construction environment,the different line reinforcing plans were choosed and the different construction plans were compared analysis,so the best plan was obtained,which make the line reinforcing plan more scientific and reliable.
针对铁路既有线桥涵改造加固的主要难点及风险,结合现场施工环境,选择了不同的线路加固方案,对不同的施工方案进行了比较分析,从而得出最优方案,使线路加固方案更加科学、可靠。
6) strengthening scheme
加固方案
1.
Alternative choice of strengthening scheme for one factory building in Taiyuan Iron and Steel Group;
太钢某厂房加固方案的比选
2.
On the supplementary measures and strengthening scheme of shield end well of a station in Nanjing city
南京某车站盾构端头井加固方案及辅助措施
3.
The structural analysis was made for the two-way curved arch bridge of the south approach bridge of Nanjing Changjiang River Bridge after the arch bridge was hit by fire and the bridge was later strengthened by the two-stage strengthening schemes.
对南京长江大桥南引桥双曲拱桥火灾后进行结构分析,采用了两阶段加固方案,经荷载试验证实了加固效果良好,可为同类工程加固提供有益的参考。
补充资料:半固态成形锭坯铸造
半固态成形锭坯铸造
billet casting for semisolid forming
banguta.Chengxlngd旧gPi Zhu之ao半固态成形锭坯铸造(billet casting for、e-misolid forming)一种生产具有细小的均匀的球状等轴晶粒组织的、供半固态模锻用锭坯的铸造工艺。这种工艺生产的锭坯又称半固态成形用材料(SSM,semisolid material)。这种材料的生产工艺有电磁流体动力学铸造法(即电磁搅拌法,简称MHD法)、应变诱导熔化法(简称SIMA法)、机械搅拌法、化学晶粒细化法、形变热处理法和奥斯普雷(Osprey)法(即喷射沉积法)等多种,其中只有前两种进入了商业化生产阶段。 1978年,美国阿卢马克斯工程金属工艺公司(AEMP)最先采用电磁搅拌法(图l)以工业规模铸出适合半固态加工的锭坯。此法电磁感应线圈产生的电磁场对凝固中的铝熔体进行强力搅拌,将结晶的树枝状晶的“枝”与“叉”打落,从而形成细小的等轴球状晶组织。控制电磁场强弱、电磁线圈高度、铸造速度、冷却强度等工艺参数,就可控制晶粒大小。20世纪90年代初,维维斯(C .vives)发明了旋转永久磁铁电磁搅拌铸造法(图2),此法转子结构简单、体积也不大、可装于现有的铸造机上,转子高度可达700mm,有利于延长搅拌时间,进一步改善铸锭组织;电能消耗低,平均为Zkw·h/t锭;设备造价低;不但可铸圆锭,且可铸扁锭和空心锭等。 暴/’ 乏踢乞4 寻 图1电磁搅拌立式半连续铸造半固态加工圆锭示意图 1一铝熔体;2一电磁搅拌线圈;3一结晶器; 4一二次冷却水;5一ssM锭 电磁搅拌铸造法对铸造直径<40mm的SSM锭有困难,为此,半固态加工几十克重的零件用的坯料用SIMA法生产。该法的工艺是,对热挤压或热轧的直径较大的棒材施加相当大的冷变形,然后把它加热到固相线与液相线之间的某一温度,即固一液状态,保温一定的时间,凝固后就可形成具有均匀球状晶粒的SSM坯料。这种获得半固态成形锭坯的工艺,目前还不能从理论上给予圆满的解释,但一般认为是由于回复与再结晶的结果。 采用机械法搅拌熔体也可获得等轴球状晶粒组织,锭坯,不过晶粒较粗大,一般平均尺寸约为2。。拜m。化学晶粒细化法是向铝熔体中添加Al一Ti一B中间合金来细化变形铝合金晶粒。形变热处理晶粒细化法是对热加工的铸造材料施加一定量的冷变形,而后把它加热到再结晶温度以上的某一温度,保温适当的时间,通过回复与再结晶,形成适合于半固态加工的细小的等轴球状晶组织。此法与SIMA法的基本区别是,前者的加热温度低,而后者的加热温度则相当高。奥斯普雷法又称喷射沉积法,也可用于生产SSM坯料。熔融金属_.2二瞧 _J卫臻斗4匕撑泌谁蛋乙习4洪翎4一64厂了飞「二弋以,二三朋一下月 4。”鄂8 b 图2旋转永久磁铁电磁搅拌半连续 铸造半固态加工圆锭示意图 a一俯视图,b一正视图 1一铝熔体;2一凝固着的铝熔浆.3一SsM锭;4一结晶器, 5一分流盘;6一永久磁铁,7一冷却水,8一铸造机锭座通过气体(氮或氢)雾化形成液滴流,以一定的速度冲·向下方的成坯盘,直径约1。即m的液滴在向下运动过程中,受到惰性气流冷却,表面温度迅速下降,发生凝固,形成外壳,而沉积时由于撞击,外壳破裂,内部正在凝固的树枝状晶破碎,形成非常细小的球状等轴晶。 (王祝堂)
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条