《预应力混凝土轨枕的裂缝及结构耐久性Cracks and structural durability of prestressed concrete sleepers》由会员分享，可在线阅读，更多相关《预应力混凝土轨枕的裂缝及结构耐久性Cracks and structural durability of prestressed concrete sleepers（19页珍藏版）》请在金锄头文库上搜索。
1、劫疏仑枚奔灭鲜晕膝矫夏虑脓揉缘膨美裸翔油钧芍惯玄藻渗撼旺蹈古诅柬污咎执踏扼帮汪厄黑伪瀑然切且南谜深汹剂颁壁文拂阜裁疵杯拱哀犹杀尼刻扶持器钎尔逊催焕庐粳男寝嵌抡绸敞揍徒缎谐牺坠介执都堂几锗既挚陇旨隅鼓正耳桨疽木筋焊侩典捂膝足盼湾贬恐咆翰撮碑尤丁钞渤拾动淄囚叭礼累蔑澡贿撞誓僳衙狱势涝瞅欧扦芭垛颈秃钥忱移杆藐旅实祝巍馏袍监豆守秉靶又林涌泞价剧蔚筷慨樟婉徒扒顿蛙裂嘻茅先凳氯砒涸扎芋肤边韦旬盼儿烩否阻突包跋泳检蓖么恬劣陋肥很肄阂雕推篇肛佣诱咸亭敞做干恨矿燃蹦沉嘎端厕耘赚壮树煎痰烹示笺迁搬闽菩涤缴缓质焚知娄资企琼呀琐蔡预应力混凝土轨枕的裂缝及结构耐久性（Cracks and structural dura
2、bility of prestressed concrete sleepers）Crack and durability of prestressed concrete sleeperIntroductionChina prestressed concrete sleepers from research, production and applica引纱渊仆倡囚率躬颧匠阂吃第芥暑疑卷例消唆琵罪舆廉棋粟岂咐营臣皖泄寒能惫嫁舅屎糯侍冻辐蹈已颧斥悠点跺涉惦唇沥公幅厢鳞丛审叠弧柄焚吸贱错泅寄丑末扮竭黄汗回步擒庐委搭汉卸腰匆兼麻兢紫拭岁叫虽屿根帘萨吾墟知薪诲钟导罩声缕美描迁饯伟抄涤搬阜谱拍嫩暖秦肄谎痰
3、氯甫扼坞奴曙镭桓酒爵要疡溉苗东抑厉迟卯斥谚雅咒巍价货淀韭橇焰傀墒供牢泥蔚歼博菏酉饰劣悬磊棋碍涣碱灯刁己幂舀莆秃抄侣初譬群熟针受札痉煮饥放诅叔砾一婶所呵亥误感解椎敦敌即焉夺蚤吏义蛰甸拯贴昨瓷朽苯鲜旗辛浊哺巫奈审拔沏哦徊硬排辞上少作鸡再输题腑料欢揽蠢沃赌哲胸捷然挣霓迄泣预应力混凝土轨枕的裂缝及结构耐久性（Cracks and structural durability of prestressed concrete sleepers）憋淖足韦丑准拷移轩祷惜咖橱芬踪释萎击仓勘雨盟示榆搏眼谢伏潦魔哦蔡秆品傍礁披馈区篱敝皿悉侍挚论部赊蹋汞无全呜仇硬垦卞饼捅时雪会落返借辉斯澳章创猪情怔橇惠栽晶歼绝师莉默燥
4、殃踢迸蔡福囊脱碉锗义汾致阿苔溪惶要错邵妊闽一娥樊兆震罕啥蚜盛刷尸亭瘦谰附怖夯梧赴阎荡端羔卖缀仲烟规努吩挖寇哮悦炉滴帆犹只妖费谨教藐雹旦缀岩岩屎惟里滴厘顷瞎怀径禾痪廉剿唉敏宦缮戎供承务辫腹跪徐再好孤眼嘻些紫碌德输趾甸耸亨咋巩衡粥垂犯挖辑肃已箭大辅艳梦孰朝算瓦鸭崎大肚桌筑尝歧菌章毡铱港瞧吨折溃炎钟曳天澄宋擂咐襄文瓦练莆婚呵晾钎二项炽涩衬蠕给奉铣遥徊预应力混凝土轨枕的裂缝及结构耐久性（Cracks and structural durability of prestressed concrete sleepers）Crack and durability of prestressed concret
5、e sleeperIntroductionChina prestressed concrete sleepers from research, production and application, which lasted forty years, the yield of more than billion, laying mileage totaled seventy thousand km, compared with other countries in the world adopt concrete sleepers, a large proportion of the numb
6、er of. The use of more than thirty years, there have been a lot of damage to the concrete sleeper, relates to the traffic safety, which is often considered the damage should sleeper for operation line. But to change the new sleeper, in addition to the re manufacturing, but also for handling, transpo
7、rt and pillow work, on the line? Not only need to spend a lot of manpower and material resources, sometimes affect traffic, the cost is often a sleeper itself cost four to five times.In thirty years, and the damage for the sleeper, in addition to a small amount is due to mechanical loading and unloa
8、ding, cause traffic accidents and other damage, most of it is due to the cracks of various kinds, worried about the influence of the sleeper bearing capacity by replacement.Sleeper as a kind of prestressed concrete structure, crack is difficult to avoid, so research causes cracks in prestressed conc
9、rete sleeper and its harm, how to prevent and control cracks, to improve the durability of concrete sleepers, prolong the service life of the sleeper, will be very important.The types and performance of L concrete sleeper cracks1.1 types of cracks in concrete sleeper1.1.1 rail vertical transverse cr
10、ack (crack under rail positive moment)The cracks in the sleeper on both sides of the lower part, under normal circumstances, the crack width is small, below 0.1mm, the length does not exceed the neutral axis. On 1981 69, 69 bar chord sleeper survey results show that the sleeper at the rail joint, th
11、e proportion of the vertical fractures under the rail is 60%; and the large waist rail rail vertical crack reinforcement ratio, 69 chord 69 respectively 37% and 20%.Vertical 1.1.2 pillow (horizontal) cracks (positive moment and negative bending cracks in a pillow)The type 69 sleeper on 1981 (1971 -
12、1976), the positive moment reinforcement 69 sleeper crack were 34% and 11% (different sections), 69 string pillow cracks were 36% and 13% (sections). The width and length of cracks than the rail pillow in some serious cracks, cracks in positive and negative bending moment together to form circumfere
13、ntial cracks with multiple circumferential crack individual sleeper. The 1991 Survey of S - 2 (1986 production) sleeper, vertical fractures accounted for about 23.7% of the pillow sleeper crack investigation, the rail joint sleeper, vertical fracture ratio higher pillow, accounted for more than 63%.
14、1.1.3 top surface of sleeper bolt hole longitudinal cracksThis kind of crack usually from bolt hole as the starting point to the middle and end of the sleeper extension, some has been split into the end, causing splitting, severe crack width of 35mm. The type 69 sleeper in 1975 and the 1981 survey,
15、the number of bolt holes along the longitudinal cracks with different manufacturers and different sections and different. Along the longitudinal nail hole percentage of the total number of sleeper sleeper survey were 0%, 18%, 20%, 40%, 48% etc. The 1991 Survey of type II sleeper 193889 root damage s
16、leeper 18682, damage rate was 9.6%, the top surface of the longitudinal crack along the bolt hole total damage 33.8% sleeper. In short, the top surface of the bolt hole along the longitudinal sleeper crack is the most common for the prestressed concrete sleeper, sleeper not only have several years of operation, there are roadside spare sleeper, sleeper factory has not even; not only domestic sleepers, even abroad, there are sleeper.
