摘要
我国AP/CAP系列第三代先进核电厂房建造过程中采用的开顶式施工方式,便于设备吊装,且保证了设备与模块安装和施工在恶劣天气下的连续性。为保证开顶式施工的顺利进行,临时开合顶盖在核电厂房整个建造过程中需经历三次爬升,且为便于在同一厂址内重复使用,临时顶盖必须可拆卸。同时,顶盖可能会遭遇17级台风,台风产生的巨大上拔力要靠顶盖与安全壳的抗拔支座进行抵抗。而挤压式螺栓为抗拔支座中的关键传力构件,抗拔支座通过旋入以竖向钢板为支撑的挤压式螺栓,使传力构件与安全壳产生挤压,进而产生静摩擦力,提供抗拔力。抗拔支座中的挤压式螺栓与传统夹紧式螺栓传力方式类似,螺栓传力与各接触面的相对粗糙程度、螺栓直径和螺栓构造相关,但目前还没有相关理论可以确定挤压式螺栓在传力过程中拧紧扭矩与螺栓挤压力的关系。针对以上问题,对挤压式螺栓传力进行试验研究:首先针对不同传力构件及接触面不同粗糙程度,设计了摩擦块接触试验、套筒-摩擦块接触试验和平头螺栓接触试验,验证了设置摩擦块及套筒的必要性,提出了球面端头螺栓的改进方法;然后通过采用定扭矩型电动扳手进行分级加载,得到了直接建立电动扳手档位和螺栓挤压力关系的方法;最后根据摩擦块与套筒完全约束和球面端头螺栓与安全壳直接接触两组试验结果,进一步提出改进螺栓传力的方法,并间接求得摩擦块与安全壳的动摩擦系数。研究得出:1)摩擦块和套筒的设置使抗拔支座在安装和使用的过程中对安全壳损伤最小。在设计螺栓传力构件时,球面端头螺栓需设计成椭球形,与套筒槽接近点接触,且不需考虑螺纹孔板厚对螺栓传力的影响;2)直接建立的电动扭矩扳手档位与挤压力的关系,对电动扭矩扳手的工程应用提供借鉴;3)得到的摩擦块与模拟安全壳之�
The construction of AP/CAP series third-generation advanced nuclear power plants in China adopts an open-top construction method to facilitate equipment hoisting and ensure the continuity of equipment and module installation and construction in severe weather.The temporary opening and closing of the roof guarantee the smooth progress of the open roof construction.During the entire construction process of the nuclear power plant,three climbs are required.To be reusable in the same site,the temporary roof must be removable.At the same time,the top cover may encounter a 17-level typhoon,and the huge uplift force generated by the typhoon must be resisted by the uplift support of the top cover and the containment.Extrusion bolts are the key force transmission members in the anti-pull support.The anti-pull support is screwed into the extruded bolt supported by the vertical steel plate,so that the force transmission member and the containment are squeezed,thereby generating static friction to provide pull resistance.The extruded bolt in the antipull support is similar to the traditional clamping bolt.The bolt force is related to the relative roughness of each contact surface,bolt diameter,and bolt structure,but there is no relevant theory to determine the relationship between the tightening torque and the squeezing force of the bolt in the process of force transmission.Given the above problems,this paper researched the force transmission of squeeze bolts.First,according to the different roughness of different force transmission members and contact surfaces,the friction block contact test,sleeve-friction block contact test,and flathead bolt contact test were designed to verify the necessity of setting friction block and the sleeve,and the improved method of spherical end bolt was proposed.Then,by adopting fixed torque electric wrench for staged loading,a method of directly establishing the relationship between electric wrench gear and bolt pressing force was obtained.Finally,based on the two sets of test results of the f
作者
张翔宇
王沙沙
龚景海
唐特
刘坚
周宇航
Xiangyu Zhang;Shasha Wang;Jinghai Gong;Te Tang;Jian Liu;Yuhang Zhou(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Nuclear Engineering Research&Design Institute,Shanghai 200233,China;Kowotai Membrane Structure(Shanghai)Co.,Ltd.,Shanghai 201506,China;Shanghai Weiqi Building System Co.,Ltd.,Shanghai 200941,China)
出处
《钢结构（中英文）》
2021年第8期20-27,共8页
Steel Construction（Chinese & English）
基金
国家科技重大专项(2018ZX06002002)。
关键词
抗拔支座
挤压式螺栓
螺栓挤压力
螺栓扭矩
摩擦块
anti-pull support
extrusion bolt
bolt squeeze force
bolt torque
friction block
