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Research on Cutting Force of Ultrasonic Diamond Wire Saw 被引量:5
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作者 张辽远 李鑫 《Defence Technology(防务技术)》 SCIE EI CAS 2010年第2期114-118,共5页
Based on impulse and vibration machining theories,a mathematical model of cutting force for the electroplated diamond ultrasonic wire saw was established using superposition principle.The differences between the cutti... Based on impulse and vibration machining theories,a mathematical model of cutting force for the electroplated diamond ultrasonic wire saw was established using superposition principle.The differences between the cutting forces with and without ultrasonic effect were analyzed theoretically and experimentally.The results indicate that the cutting force of diamond wire increases along with the spindle speed decrease and the lateral pressure increase.The force in ultrasonic vibration cutting is about 20% to 30% less than that in conventional cutting.Also,the cutting trajectory of single diamond grit in sawing process is simulated,and the reason that the ultrasonic vibration can reduce the cutting force is explained further. 展开更多
关键词 machinofature technique and equipment mechanics manufacturing process hard and brittle material electroplated diamond wire saw ultrasonic machining
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Preparation and Optimization of High-Purity Silicon Carbide Magnetic Abrasives for the Magnetic Induction-Wire Sawing Process 被引量:2
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作者 Wei Zhang Tengwei Qiu Chunyan Yao 《Fluid Dynamics & Materials Processing》 EI 2020年第4期709-721,共13页
In this study,magnetic abrasives were obtained by crushing and sieving sintered iron-silicon carbide(Fe-SiC)composites.Fe and SiC powders with different mesh numbers were pre-compacted using different pressures and th... In this study,magnetic abrasives were obtained by crushing and sieving sintered iron-silicon carbide(Fe-SiC)composites.Fe and SiC powders with different mesh numbers were pre-compacted using different pressures and then sintered at various temperatures and with different holding times.The dispersion uniformity of the SiC powder was improved through surface modification using polyethylene glycol(PEG)300.The resulting magnetic abrasives were characterized in terms of phase composition,density,relative permeability,and microstructure;this was followed by a comprehensive analysis to reveal the optimal processing parameters.The ideal combination of process parameters for preparing SiC magnetic-abrasive grains for the magnetic induction-wire sawing process was obtained,which are preparation load of 60 kN,a SiC mesh number of 1,500,a sintering temperature of 1100℃,and a holding time of 4 h. 展开更多
关键词 wire sawing magnetic abrasives SINTERING phase compositions
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Force Modeling for Ultrasonic-assisted Wire Saw Cutting SiC Monocryatal Wafers 被引量:1
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作者 ZHANG Jie LI Shujuan Liu Yong 《International Journal of Plant Engineering and Management》 2011年第4期225-236,共12页
The advantages, such as a small cutting force, narrow kerf and little material waste make wire saw cut- ting suitable for machining precious materials like SiC, Si monocrystal and a variety of gem. As regards wire saw... The advantages, such as a small cutting force, narrow kerf and little material waste make wire saw cut- ting suitable for machining precious materials like SiC, Si monocrystal and a variety of gem. As regards wire saw cutting fo wafer, however, in traditional wire saw cutting process, the cutting efficiency is low, the wear of wire saw is badly, the surface roughness of wafer is poor etc, which have a seriously impact on the cutting process stability and the use of wafers. Ultrasonic-assisted machining method is very suitable for processing a variety of non-conduc- tive hard and brittle materials, glass, ceramics, quartz, silicon, precious stones and diamonds, etc. In this paper, the force model of ultrusonic-assisted wire saw cutting of SiC monocrystal wafer, based on the kinematic and experi- mental analysis were established. The single factor and orthogonal experimental scheme for different processing pa- rameters such as wire saw speed, part rotation speed of and part feed rate, were carried out in traditional wire saw and ultrasonic-assisted wire saw cutting process. The multiple linear regression method is used to establish the static model among the cutting force, processing parameters and ultrasonic vibration parameters, and the model signifi- cance is verified. The results show, as regards ultrasonic-assisted wire saw cutting of SiC monicrystal wafer, both the tangential and normal cutting forces can reduce about 24. 5%-36% and 36. 6%-40%. 展开更多
关键词 wire saw ULTRASONIC-ASSISTED cutting force MODELING
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Research on Cutting Trajectory of Electroplated Diamond Wire Saw
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作者 张辽远 王超 +1 位作者 王建光 杨勇 《Defence Technology(防务技术)》 CAS 2012年第2期124-128,共5页
The cutting process of electroplated diamond wire saw was researched on the basis of impulse and vibration machining theories. The different contact states in the cutting process were analyzed by using the finite elem... The cutting process of electroplated diamond wire saw was researched on the basis of impulse and vibration machining theories. The different contact states in the cutting process were analyzed by using the finite element method. It shows that the cutting stress is uniformly distributed along the direction of the workpiece width in the steady state. A mathematical equation of sawing trajectory was established by using the superposition principle and the cutting experiment of wire saw to calculate the cutting trajectory. The comparison of the theoretical trajectory with the calculated one indicates that the error is less than 15%. The research results provide a theoretic basis for optimization of the saw's cutting process parameters. 展开更多
关键词 manufacturing technique and equipment electroplated diamond wire saw sawing trajectory stress analysis trajectory equation
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Microstructure and mechanical properties of heat-affected zone of 680 MPa grade steel endured thermal cycle of double-wire SAW
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作者 杨秀芝 余圣甫 +2 位作者 姚润钢 霍光瑞 周强 《China Welding》 EI CAS 2010年第1期65-69,共5页
Based on the measured thermal cycle of double-wire submerged arc welding (SAW), the gleeble thermal test was performed. Meanwhile, the Charpy V-notch impact test at -50 ℃ and hardness test at room temperature were ... Based on the measured thermal cycle of double-wire submerged arc welding (SAW), the gleeble thermal test was performed. Meanwhile, the Charpy V-notch impact test at -50 ℃ and hardness test at room temperature were carried out after the thermal test. Thermally cycled microstructure and fracture surfaces were observed too. The results indicate that impact toughness of heat-affected zone (HAZ) at -50 ℃ is lower than that of parent metal with different wire spacing and welding speed. The microstracture of coarse-grains heat-affected zone ( CGHAZ ) is mainly made up of lath bainite with serious brittleness. The study also shows that a smaller energy input could be adopted to ensure the toughness of welded joints at the welding process in a common molten pool, while a higher energy input could be exerted to enhance welding efficieney at the welding process in two separate molten pools. 展开更多
关键词 double-wire saw thermal simulation impact toughness
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Experimental study of free abrasive wire sawing by using multi-strands wire
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作者 Yao Chunyan Wang Jinsheng +2 位作者 Peng Wei Jin Xin Chen Shijie 《Engineering Sciences》 EI 2013年第6期80-84,共5页
Grains in the slurry can be brought into cutting zone by steel wire with a certain speed to achieve the purpose of removing the workpiece material in the free abrasive wire sawing machining. Because its own of multi- ... Grains in the slurry can be brought into cutting zone by steel wire with a certain speed to achieve the purpose of removing the workpiece material in the free abrasive wire sawing machining. Because its own of multi- strands characteristics, we use it to replace the steel wire to do slicing experiment. In this paper, multi-strands wire is made by seven metal wires and has many grooves on its surface. Compared with steel wire, it can carry more grains into cutting zone which is conducive to improving the slicing efficiency. We do some comparative slic- ing experimcnts by applying multi-strands wire (~b0.25 mm) and steel wire (~b0.25 mm) to cut optical glass (K9). The results show that slicing efficiency and the surface roughness of the workpiece sliced by using multi-strands wire are better than that by using steel wire. but the kerf width of the former is wider than that of the latter in the same experimental conditions. 展开更多
关键词 wire saw free abrasive machining slicing efficiency
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Twin-wire SAW welding of 70 kg class high strength steel
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作者 XU Lei QU Zhaoxia WANG Haitao 《Baosteel Technical Research》 CAS 2013年第3期14-18,共5页
The twin-wire SAW welding process was investigated using Baosteel 70 kg class high strength steel, and the properties of the joints were studied using conventional single and double-faced grooves as well as an optimiz... The twin-wire SAW welding process was investigated using Baosteel 70 kg class high strength steel, and the properties of the joints were studied using conventional single and double-faced grooves as well as an optimized groove. The results showed that by using an optimized double-faced groove, a small root face, and no back gouging, a small welding heat input was achieved and thus the joint strength and toughness were improved significantly. Also, removing back gouging reduced the labor required in the process. The weld reinforcement and deformation were observed to be rather small. 展开更多
关键词 twin-wire saw groove type welding joint properties
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A Study on a Wire Tension Adaptive Control System of a Multi-wire Saw in Computer Simulation
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作者 LI Wei ZENG Yong-dong 《International Journal of Plant Engineering and Management》 2011年第3期170-177,共8页
Based on the analysis of the mechanism of wire tension control by using torque motors in the multi-wire saw machining process, some mathematical models of a tension control system are studied, and an adaptive algo- ri... Based on the analysis of the mechanism of wire tension control by using torque motors in the multi-wire saw machining process, some mathematical models of a tension control system are studied, and an adaptive algo- rithm is designed for controlling the wire tension. In this algorithm of tension control, the rotation speeds and waving angle of motors are measured and fed back to the controller, and the NLMS( normalized least mean squares) algorithm is used to calculate the adaptive correction value and control the wire tension accurately. The computer simulation results in Matlab software validate the high accuracy for controlling the system of the wire tension with the NLMS algorithm in the multi-wire saw machining process. 展开更多
关键词 multi-wire saw wire tension adaptive control computer simulation
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Experimental Study on the Machining Technology of ZrO_2 Ceramics Using Diamond Wire Saw with Ultrasonic Vibration 被引量:1
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作者 张辽远 吕玉山 +2 位作者 李红 张莹 李玉潮 《Defence Technology(防务技术)》 SCIE EI CAS 2007年第2期151-155,共5页
The influence of different technological parameter on material remove rate and surface quality of ZrO2 ceramics is studied using the cutting machining method of electroplate diamond wire saw with ultrasonic vibration.... The influence of different technological parameter on material remove rate and surface quality of ZrO2 ceramics is studied using the cutting machining method of electroplate diamond wire saw with ultrasonic vibration.Experimental results show that,compared with the same experiment condition without ultrasonic vibration,this cutting method has the advantages of high material remove rate,good surface quality,little brokenness and so on. 展开更多
关键词 制造工程 硬度 脆性 机械加工 超声波
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Sawing Performance Comparison of Brazed and Sintered Diamond Wires 被引量:4
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作者 HUANG Guoqin XU Xipeng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第2期393-399,共7页
Great attention has been paid on fabricating diamond wire by using the brazing diamond because of its strong chemical bonding strength and controllability of grits distribution. Although several serving performances o... Great attention has been paid on fabricating diamond wire by using the brazing diamond because of its strong chemical bonding strength and controllability of grits distribution. Although several serving performances of brazed diamond wire have been reported, seldom do these studies refer to its process characteristics. Sawing performances of a brazed diamond wire are investigated and compared with those of a sintered diamond wire on a wire saw machine. The surface topographies of beads selected from the two wires are micro observed before sawing. The sawing tests are carried out in constant feed rate feeding(CFF) and constant normal force feeding(CNFF). In CFF test, sawing force, power, and the cut depths of positions on contact curve are measured. Then, coupled with the observations of beads topographies, sawing force and its ratio, relations of power against material removal rate, and contact curve linearity are compared and discussed. In CNFF test, the sawing rates of the two wires are investigated. The results indicate that the brazed wire performs with lower sawing force(less 16% of tangential force and 28% of normal force), more energy efficiency(nearly one-fifth of sawing power is saved), at a higher sawing rate (the rate is doubled) and with better contact curve linearity as compared with the sintered wire. This proposed research experimentally evaluates the sawing performances of brazed diamond wire from the aspect of process parameters, which can provide a basis for popularizing the brazed diamond wire. 展开更多
关键词 diamond wire BRAZE SINTER sawing force power contact curve
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Study on swarf when sawing granite with diamond wire 被引量:1
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作者 WU Hairong GUO Hua +1 位作者 ZHAO Ruyi HUANG Hui 《金刚石与磨料磨具工程》 CAS 北大核心 2018年第2期71-77,共7页
The diamond wire-sawing process was developed to cut granite in both quarries and block processing plants.In this paper,swarf was collected from different areas along the sawing arc when sawing three granites.The part... The diamond wire-sawing process was developed to cut granite in both quarries and block processing plants.In this paper,swarf was collected from different areas along the sawing arc when sawing three granites.The particle size distribution and the morphology of the swarf were investigated systematically,along with the swarf formation mechanism in sawing.Granite swarf formation was dominated by transgranular fractures based on the morphology of sawn granite chips and the analysis of sawn chip size.A long cutting arc increased the movement among the swarf,tool,and workpiece,thereby inducing a secondary fracture in the sawn chip. 展开更多
关键词 DIAMOND wire sawING GRANITE swarf
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Twin-wire Submerged Arc Welding Process of a High-strength Low-alloy Steel
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作者 杨秀芝 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第1期114-117,共4页
The measurement of thermal cycle curves of a high-strength low-alloy steel (HSLA) subjected twin-wire submerged arc welding (SAW) was introduced. The thermal simulation test was performed by using the obtained cur... The measurement of thermal cycle curves of a high-strength low-alloy steel (HSLA) subjected twin-wire submerged arc welding (SAW) was introduced. The thermal simulation test was performed by using the obtained curves. The impact toughness at -50 ℃ temperature of the simulated samples was also tested. OM, SEM and TEM of the heat-affected zone (HAZ) of some simulation specimens were investigated. The results showed that the HSLA endured the twin-wire welding thermal cycle, generally, the low-temperature toughness values of each part of HAZ was lower than that of the parent materials, and the microstructure of coarse-grained zone(CGHAZ) mainly made up of granular bainite is the reason of the toughness serious deterioration. Coarse grain, grain boundary carbide extract and M-A island with large size and irregular polygon, along the grain boundary distribution, are the reasons for the toughness deterioration of CGHAZ. The research also showed that selected parameters of twin-wire SAW can meet the requirements to weld the test steel. 展开更多
关键词 twin-wire saw impact toughness welding thermal cycle
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金属狭缝中SAW传感器信号传输的设计与优化 被引量:1
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作者 褚博文 丁杰雄 +2 位作者 关利超 边志远 李海宁 《压电与声光》 CSCD 北大核心 2015年第2期205-208,212,共5页
声表面波(SAW)器件可实现无源无线传感测量,为金属狭缝极端环境下接触应力的测量提供了解决思路。该文主要研究了狭缝中SAW器件的信号传输问题,选用微带线作为信号传输线。分析了金属狭缝对微带线传输性能的影响,设计出信号传输线及匹... 声表面波(SAW)器件可实现无源无线传感测量,为金属狭缝极端环境下接触应力的测量提供了解决思路。该文主要研究了狭缝中SAW器件的信号传输问题,选用微带线作为信号传输线。分析了金属狭缝对微带线传输性能的影响,设计出信号传输线及匹配电路。最后把设计出的微带线与谐振器键合连接,并进行实验测试。通过对金属狭缝中信号传输问题的研究,验证了狭缝等极端环境实施应力测量的可行性。 展开更多
关键词 金属狭缝 saw 微带线 阻抗匹配 键合连接
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Polycrystalline diamond mini-cubes for sawing applications 被引量:1
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作者 Sung James C. Chang Kuen-liang +2 位作者 Tso Pei-lum Hsu Kai-hung Sung Michael 《金刚石与磨料磨具工程》 CAS 北大核心 2008年第S1期83-87,共5页
Diamond grits are indispensable for sawing granite or concrete.Each year about 1 000 tons of diamond grits are consumed for such purposes.In all cases,mono crystalline diamond is used.However, polycrystalline grits(po... Diamond grits are indispensable for sawing granite or concrete.Each year about 1 000 tons of diamond grits are consumed for such purposes.In all cases,mono crystalline diamond is used.However, polycrystalline grits(polygrits) are generally better performed than mono grits as abrasives.For example,poly grits of cubic boron nitride(e.g.Borazon(?) CBN-550 of Diamond Innovations) can cut faster and they last longer than mono grits(e.g.Borazon(?) CBN-500). Polygrits of alumina(e.g.Cubitron(?) of 3M) also out perform by far glassy grits(e.g.white alumina).For diamond superabrasives,micron polygrits formed by shock waves may polish as fast as mono grits of the same size,but without causing as much scratches due to the presence of smaller sintered grains.The improved performance of poly grits is attributed to their ability to micro chipping that renews the sharp cutting corners from time to time.By contrast,mono grits tend to round off at low cutting force or macro fracture at high cutting force,so they may lose the cutting ability rapidly. For sawing granite with mesh sizes 40/50 or coarser,poly grits of diamond have not been available until recently.In this research,we have made polygrits in mini cube with sizes of 18/20,20/25,and 30/40.Turbo grinders and wire saws were made by brazing both mono grits and polygrits on steel substrates.Cutting performance on granite demonstrated that grinding speed was faster with turbo grinder,and the surface finish was smoother with wire saw for poly grits than mono ones. Polygrits and mono grits of diamond were mixed for comparison(upper left).Polygrits of mini cubes were brazed on the pearl of a wire saw(upper right).Mono diamond grits were brazed on a turbo grinder(bottom diagrams ). 展开更多
关键词 GRANITE sawING diamond grits polygrits TURBO GRINDER wire saw
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SAW高速焊接焊丝和焊剂国产化替代的开发研究
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作者 周长海 《电焊机》 北大核心 2014年第5期148-153,共6页
卧式埋弧焊机高速焊接使用的焊丝和焊剂进行国产化替代,并在此基础上使用气保焊焊丝代替埋弧焊焊丝进行焊接,获得了成功。通过实践、理化试验相关金相证明,该焊接新工艺是可靠的。探索出的一条适合该卧式高速焊接的焊接工艺即ER50-6+SJ... 卧式埋弧焊机高速焊接使用的焊丝和焊剂进行国产化替代,并在此基础上使用气保焊焊丝代替埋弧焊焊丝进行焊接,获得了成功。通过实践、理化试验相关金相证明,该焊接新工艺是可靠的。探索出的一条适合该卧式高速焊接的焊接工艺即ER50-6+SJ101的焊接新工艺,与旧工艺相比,新工艺应用广泛、取材广,应用价值和经济性更好。新工艺已经成熟,焊接质量稳定,焊接速度满足生产要求,焊接成本也大幅度下降,经济效益可观。 展开更多
关键词 气体保护焊丝 埋弧焊焊剂 国产化替代 焊接新工艺
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线锯用金刚石微粉表面化学镀镍工艺及性能研究
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作者 方莉俐 刘韩 +1 位作者 姜羽飞 段雪纯 《工具技术》 北大核心 2024年第4期54-58,共5页
金刚石微粉性能是提升金刚石线锯性能的关键因素。用化学镀方法在线锯用金刚石微粉表面镀镍,通过正交试验研究金刚石粒度、次亚磷酸钠浓度、镀液pH值和镀液温度对化学镀镀层沉积速率、镀层密度、镀层耐腐蚀性能、镀层致密度等性能的影... 金刚石微粉性能是提升金刚石线锯性能的关键因素。用化学镀方法在线锯用金刚石微粉表面镀镍,通过正交试验研究金刚石粒度、次亚磷酸钠浓度、镀液pH值和镀液温度对化学镀镀层沉积速率、镀层密度、镀层耐腐蚀性能、镀层致密度等性能的影响。结果表明:M1/2、M6/12、M20/30三种不同粒度金刚石微粉,在次亚磷酸钠浓度为25~35g/L、化学镀液pH值为3~11、化学镀温度为30℃~90℃时,针对镀层沉积速率、镀层密度和镀层耐腐蚀性的最佳工艺参数不同;不同粒度的金刚石微粉在相同工艺条件下化学镀镍,金刚石微粉粒度越大,镀层越均匀致密;金刚石微粉化学镀镍各工艺参数之间相互作用,共同影响镀层性能。对于不同粒度的金刚石微粉,各因素对镀层性能的影响权重不同,因此针对不同粒度、不同镀层性能需求的金刚石微粉应采取不同的镀覆工艺参数。 展开更多
关键词 金刚石微粉 线锯 化学镀镍 工艺 性能
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基于小样本数据驱动模型的硅片线切割质量预测 被引量:1
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作者 李博文 张宏帅 +2 位作者 赵华东 胡晓亮 田增国 《机床与液压》 北大核心 2024年第1期66-73,共8页
在单晶硅加工中,硅片多线切割质量检测耗时和检测成本高造成硅片质量检测难。因此,提出一种基于生成对抗网络(WGAN-GP)数据处理与自注意力残差网络(SeResNet)的硅片质量预测方法。分析多线切割的机制,确定影响硅片质量的工艺参数,建立... 在单晶硅加工中,硅片多线切割质量检测耗时和检测成本高造成硅片质量检测难。因此,提出一种基于生成对抗网络(WGAN-GP)数据处理与自注意力残差网络(SeResNet)的硅片质量预测方法。分析多线切割的机制,确定影响硅片质量的工艺参数,建立数据样本,使用WGAN-GP对样本数据进行数据增强。在此基础上,建立基于SeResNet的硅片总体厚度偏差预测模型。以硅片的多线切割加工过程监控数据为模型验证数据,对构建的硅片总体厚度偏差预测模型进行验证。实验结果表明:该模型具有良好泛化性和高准确率,有效解决了小样本数据下的预测难题,实现了平均相对误差小于10%的硅片总体厚度偏差预测,所以基于数据驱动的硅片质量预测来代替硅片加工中的质量检测具有重要的现实意义。 展开更多
关键词 硅片 线切割 总体厚度偏差预测 生成对抗网络 数据增强
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晶硅太阳能电池制备过程中硅渣和金刚石线切割硅废料的回收利用研究进展
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作者 何乾 范斌 +3 位作者 宋剑飞 邹应萍 伍继君 马文会 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第7期2456-2467,共12页
随着晶硅太阳能电池的快速发展,晶体硅片的需求大幅增加。晶体硅片在生产制备过程中,大量的硅以硅渣和金刚石线切割硅废料的形式流失。硅渣和金刚石线切割硅废料中硅的回收再循环利用对降低晶硅太阳能电池的成产成本、有效解决晶体硅片... 随着晶硅太阳能电池的快速发展,晶体硅片的需求大幅增加。晶体硅片在生产制备过程中,大量的硅以硅渣和金刚石线切割硅废料的形式流失。硅渣和金刚石线切割硅废料中硅的回收再循环利用对降低晶硅太阳能电池的成产成本、有效解决晶体硅片短缺以及环境污染等问题具有重要意义。本文通过对从硅渣和金刚石线切割硅废料中回收制备高纯硅的现有工艺和研究进展进行综述,对不同回收工艺的优势、缺陷以及改进措施进行分析,有助于研究人员选择合理的高纯硅回收策略,为晶硅太阳能电池产业的低成本、绿色可持续发展提供参考。 展开更多
关键词 晶硅太阳能电池 硅渣 金刚石线切割硅废料 高纯硅回收
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无润滑条件下工艺参数对Al6063金刚石线切表面粗糙度影响
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作者 高永华 吕涵 +3 位作者 杜倡 武胜 李士鹏 秦旭达 《制造技术与机床》 北大核心 2024年第8期138-142,共5页
金刚石线锯因具有超高的硬度和耐磨性,常用于切削各种硬质材料,因加工过程摩擦较为剧烈,通常加冷却润滑介质,但一些特殊需求下,铝合金需要线切时无法施加冷却液。基于单因素试验法,在无润滑条件下进行了Al6063材料的线锯试验,分析了加... 金刚石线锯因具有超高的硬度和耐磨性,常用于切削各种硬质材料,因加工过程摩擦较为剧烈,通常加冷却润滑介质,但一些特殊需求下,铝合金需要线切时无法施加冷却液。基于单因素试验法,在无润滑条件下进行了Al6063材料的线锯试验,分析了加工表面不同区域粗糙度的分布规律以及配重、线速度与进给速度对加工表面粗糙度的影响规律。结果表明,加工面中间位置表面粗糙度最大;在试验范围内配重越大,对应的表面粗糙度值越小;金刚石线锯线速度越大,其表面粗糙度值越小;进给速度越小,所对应的表面粗糙度值越小。试验结果对提高加工表面质量有实际参考价值。 展开更多
关键词 金刚石线锯 工艺参数 表面粗糙度 白光干涉仪
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基坑盖板下逆作车站地下连续墙托换破除技术
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作者 罗鹏 刘映晶 +2 位作者 卢敬科 林廷松 朱汉华 《岩土工程技术》 2024年第3期330-336,共7页
附属结构与地铁车站连通常需要对地下连续墙进行破除,当地下连续墙上设有临时承重盖板时破除的施工难度更大,风险更高。以某地铁盖挖逆作车站的地下连续墙破除施工为依托,提出了利用局部破除体作为临时竖向支撑进行托换破除的施工方法... 附属结构与地铁车站连通常需要对地下连续墙进行破除,当地下连续墙上设有临时承重盖板时破除的施工难度更大,风险更高。以某地铁盖挖逆作车站的地下连续墙破除施工为依托,提出了利用局部破除体作为临时竖向支撑进行托换破除的施工方法。首先,采用数值计算分析了不同托换间距对盖板结构体系的受力影响,综合施工进度和作业空间考虑,确定预留1m宽的临时托换柱和不大于12m的破除间距为控制指标,能够满足各受力结构体系在临时托换施工下的承载性能要求;其次,对盖板下地下连续墙破除及切割块转运施工进行了详细分析,给出了分块尺寸、切割块吊装、预留柱节点等关键施工环节的控制指标与做法。实施结果表明:利用既有地下连续墙作为临时托换结构进行破除地下连续墙的施工方法,安全可靠,施工速度快,成本经济。 展开更多
关键词 盖板 托换间距 地下连续墙破除 数值计算 绳锯切割
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