顶管施工工艺选择分析

根据顶管施工技术的发展，介绍了两种顶管施工工艺的优缺点，综合分析了顶管施工工艺的选择，指出应根据工艺特点、施工实际情况科学确定顶管施工工艺，从而提高工程施工效果。     

某地铁线上水DN2000钢管顶管施工关键技术

以上海某地铁线上水DN2000顶管工程施工为例，从作业井的施工方法、钢管的焊接、沉降和隆起的控制等方面阐述了钢管顶管施工关键技术，经实践证明，具有显著的社会和经济效益。     

对高层建筑中电气竖井、管道竖井设计的探讨

对高层建筑中电气竖井、管道竖井的设计进行讨论，探讨竖井的合并、最小尺寸的确定、预留孔洞的设置等设计中遇到的问题。     

地下工程流–固耦合试验新技术及其在充填型岩溶管道突水模型试验中的应用

在地质力学模型试验技术的基础上,根据大型交通、水利水电及矿山工程的需要,开展大比尺流–固耦合模型试验技术研究,包括新型流–固耦合相似材料、三维可视化固液耦合试验系统以及多物理场信息监测分析技术。提出了流–固耦合相似材料的配制原则,选择了多种性能耦合较小的调节剂,实现了强度、渗透性、重度等指标的独立调节,大大提高了材料的相似度,保证材料能够在水长期作用下保持稳定的性质,很好地模拟中、低强度的岩体、破碎带及充填物。三维可视化固液耦合试验系统具备了自动化静力加载和数字化水压加载功能,实现了复杂地质条件下有压水体与相似材料的大面积直接作用,为流—固耦合条件下渗流和突涌水过程的模拟提供了可视化的试验场所。光纤技术、电阻元件柔性防水技术和自动化数据采集分析系统,实现了水环境下模型体内部渗压、应变和位移的精确采集和分析。最后,依托湖北省保康至宜昌高速公路尚家湾隧道,开展了充填型岩溶管道失稳突水的大比尺三维模型试验研究,真实再现了工程中的突涌水过程,揭示了充填型岩溶管道突水的灾变特征。流–固耦合试验新技术得到成功应用,为试验的顺利进行提供了技术保证。     

Development of the bus joint for the ITER Central Solenoid

The terminations of the Central Solenoid (CS) modules are connected to the bus extensions by joints located outside the CS in the gap between the CS and torodial field (TF) assemblies. These joints have very strict space limitations. Low resistance is a common requirement for all ITER joints. In addition, the CS bus joints will experience and must be designed to withstand significant variation in the magnetic field of several tenths of a Tesla per second during initiation of plasma. The joint resistance is specified to be less than 4 nΩ.The joints also have to be soldered in the field and designed with the possibility to be installed and dismantled in order to allow cold testing in the cold test facility. We have developed coaxial joints that meet these requirements and have demonstrated the feasibility to fabricate and assemble them in the vertical configuration. We introduced a coupling cylinder with superconducting strands soldered to the surface of the cable that can be installed in the ITER assembly hall and at the cold test facility. This cylinder serves as a transition area between the CS module and the bus extension.We made two racetrack samples and tested four bus joints in our Joint Test Apparatus. Resistance of the bus joints was measured by a decay method and by a microvoltmeter; the value of the current was measured by the Hall probes. This measurement method was verified in the previous tests. The resistance of the joints varied insignificantly from 1.5 to 2 nΩ.One of the challenges associated with a soldered joint is the inability to use corrosive chemicals that are difficult to clean. This paper describes our development work on cable preparation, chrome removal, compaction, soldering, and final assembly and presents the test results.     

大型喷泵进水流道加工工艺研究

某大型喷泵进水流道线型复杂,加工精度要求高,需综合平衡板件加工、焊接质量及焊接变形控制难度。基于"先大后小、适当余量、便于焊接"的原则进行了板件划分,并采用冷、热弯加工相结合的方法完成板件制作,最终实现流道整体焊接成型,为复杂线型、大尺寸、高强度厚板结构的制作提供了可行的施工经验。     

榆钢2号高炉顽固性悬料的分析和处理

由于长时间连续滑尺崩料导致高炉料柱僵死,透气性急剧变差,边缘形成细小管道,处理不及时,最终导致高炉出现顽固性悬料,处理上采取休风堵风口,只留铁口两侧1#、14#风口,以增加鼓风动能,从局部逐渐烧出空间,待高炉顽固性悬料解除后由于炉缸长时间没有热量给予补充导致高炉出现炉凉,炉况顺行难以保证,后期大量集中加净焦尽快补充炉缸热量,并且采取小批重、轻负荷等措施恢复炉况,一周之后炉况逐步恢复,顺行趋于稳定。     

齐岳山隧道F11断层开挖施工技术

针对如何通过高压富水、破碎的断层地段这一国内外隧道施工难题,主要介绍了宜万铁路齐岳山隧道进口F11断层开挖采用的3台阶预留弧形核心土开挖法,及施工过程中的大部分关键技术措施,以期指导今后同类隧道开挖施工。