现浇简支箱梁外侧模纵向滑移施工技术研究

针对现浇简支箱梁外侧模纵向滑移施工技术问题,本文结合具体工程实例,首先分析了外侧模支架及模板的设计,然后对侧模整体滑移进行了力学计算和模拟分析,最后根据确定的施工方案,阐述了现浇简支箱梁外侧模纵向滑移施工技术及控制措施,研究结果表明:模板在不同跨度下的应力分布与跨度成正比,确定了合理的跨度为6 m;采用侧模滑移方案能有效节约工期、减少成本,并提高项目的社会效益。

浅析现浇简支梁施工用外侧模滑移台车技术

外侧模滑移台车技术为了解决在不处理软弱地基的前提下,充分利用已有承台墩身作为依托,不受地质条件影响和桥下地形的限制,尽可能提高施工机械化程度,节约人力,做到标准化程度高,保证施工质量,施工不干扰桥下通行,做到适用范围广、通用性强。

山区组拼式桁架箱梁外侧模整体推拉向前施工工法

对钢桁架、倒角钢模、方木及竹胶板面板在地面平整场地上的组拼进行了介绍,总结了通过吊车将各节段吊装至首件梁支架上进行逐节拼装完成梁体制作的施工要点,并利用人工或小卷扬机牵引作用而逐孔向前进行拆装作业,采用该方法进行桥梁施工不仅加快了施工进度,而且节约了成本。

环形结构木模板施工技术研究

在工程建设中,出现了大量的环形结构工程,例如污水处理厂污泥池、二沉池,水泥厂料仓等,普遍设计为环形结构。目前,在环形结构施工中,模板通常选用定型钢模板,但因工程结构的特殊性,钢模板定型加工后,基本为一次性使用,存在周转使用价值不大,成本支出高、材料浪费大且钢模板搬运吊装不便等问题,而采用木模板体系则取材方便、一次投入成本低,操作简单且木模板可多次周转使用。通过工程实践应用,探究并总结环形结构木模板施工技术,在环形结构施工中具有较为广泛的推广意义。

现浇简支箱梁侧模纵向移动施工技术

连(云港)镇(江)铁路淮安特大桥21孔双线现浇简支箱梁,改变了传统的施工工艺,结合工程特点在进行充分比选论证的基础上选用了碗扣式支架法现浇施工,为降低箱梁外侧模在装拆过程中的安全风险,减少安全隐患,节约资源,降低成本,加快施工进度,提高经济效益和社会效益,采用了外侧模纵向移动施工技术。碗扣式支架法现浇简支箱梁外侧模纵向移动施工工艺的成功应用解决了箱梁施工中的安全、质量、进度与成本的诸多难题,达到了预期目的。

关于菱形挂篮结构形式及预压方式优化研究

每种形式都有其各自优缺点,操作更加方便快捷是我们追求的目标。三角斜撑加固外侧模与桁架加固外侧模相比,加工制作方便,结构亦变得轻巧、简洁,大大降低了挂篮主承重系统的重量;新增后锚分配梁固定在原有挂篮桁架片下弦杆后支点处的分配梁上,通过钢管支架固定新增后锚分配梁上,在安拆后锚杆时只需通过升将两道分配梁间设置螺旋千斤顶即可完成后锚杆的安拆工作,节省新增分配梁安拆时间。充分利用内模与底模、侧模之间的空间,通过吊装灌满河砂的φ630 mm×8 mm螺旋钢管将内模与侧模之间的空间充填密实,在底模铺设加强弦杆来充实内模与底板之间的空间。

Clinical study on Tuina plus physical agents for lateral collateral ligament injury of ankle in gymnasts

Objective To compare the efficacy of Tuina(Chinese therapeutic massage)plus physical agents and physical agents alone for lateral collateral ligament injury of ankle in gymnasts,and to explore the feasibility of Tuina for injury intervention in competitive athletes.Methods A total of 64 gymnasts with types Ⅰ-Ⅱ lateral collateral ligament injury of ankle were selected and divided into a control group and an observation group according to a full analysis set based on the intention-to-treat principle,with 32 cases in each group.Patients in the control group received ultrasound and microwave treatment,while those in the observation group received additional Tuina manipulations.The efficacy was evaluated by total effective rate,visual analog scale(VAS)score,and American Orthopedic Foot and Ankle Society ankle-hindfoot scale(AOFAS-AHS)score.Results The total effective rate was 96.9% in the observation group and 90.6% in the control group.There was no statistical difference in the total effective rate between the two groups(P>0.05).The markedly effective rate was 75.0% in the observation group and 46.9% in the control group.The markedly effective rate in the observation group was higher than that in the control group(P<0.05).After treatment,the VAS scores of both groups showed a downward trend,and there were statistical differences between different treatment time points in the same group(P<0.05).After one and three months of treatment,the VAS scores of the observation group were lower than those of the control group(P<0.05).There were statistical differences in the AOFAS-AHS score before and after treatment within the same group(P<0.05).After one month of treatment,there was no statistical difference in the AOFAS-AHS score between the two groups(P>0.05).After three months of treatment,the AOFAS-AHS score in the observation group was higher than that in the control group,indicating statistical significance(P<0.05).There was an interaction between time and group(P<0.05).Conclusion Tuina plus physical agents can improve the symptoms of lateral collateral ligament injury of ankle in gymnasts.This combined treatment is superior to physical agents alone in relieving pain and improving joint functions.Therefore,Tuina plus physical agents can be used as a treatment for lateral collateral ligament injury of ankle in gymnasts.