世界桥梁
世界橋樑
세계교량
World Bridges
2015年
6期
83-87
,共5页
箱梁桥%预应力混凝土结构%横向拓宽%结构分离%纵向伸缩缝%伸缩装置%调查
箱樑橋%預應力混凝土結構%橫嚮拓寬%結構分離%縱嚮伸縮縫%伸縮裝置%調查
상량교%예응력혼응토결구%횡향탁관%결구분리%종향신축봉%신축장치%조사
box girder bridge%prestressed concrete structure%transverse widening%structural separation%longitudinal expansion joint%expansion device%survey
银川黄河大桥主桥为（60＋5×90＋60） m三向预应力混凝土T形刚构桥，桥梁拓宽时，新旧桥上下部结构均不连接，采用纵向伸缩装置连接新旧桥面板。为了解纵向伸缩装置用于既有桥梁横向拓宽中的适用性，在该桥拓宽完并运营7年后对弹塑体无缩缝伸缩装置、JFC减振防滑伸缩装置和EM R树脂弹性混凝土伸缩装置的使用状况进行调查，分析伸缩装置损坏率和损坏原因。结果表明：弹塑体无缩缝伸缩装置损坏率最高，EM R树脂弹性混凝土伸缩装置其次，JFC减振防滑伸缩装置最低（仅为6．7％，远低于其它2种）；JFC减振防滑伸缩装置与周边混凝土接触处存在细微缝隙，不存在剥离现象，运营状况较好，其它2种与周边混凝土剥离严重；该桥采用结构横向分离式拓宽时，通过纵向伸缩装置连接拼接缝两侧的桥面铺装层基本可行，建议推广使用JFC减振防滑伸缩装置，并对其做针对性改良，以满足结构受力和变形要求。
銀川黃河大橋主橋為（60＋5×90＋60） m三嚮預應力混凝土T形剛構橋，橋樑拓寬時，新舊橋上下部結構均不連接，採用縱嚮伸縮裝置連接新舊橋麵闆。為瞭解縱嚮伸縮裝置用于既有橋樑橫嚮拓寬中的適用性，在該橋拓寬完併運營7年後對彈塑體無縮縫伸縮裝置、JFC減振防滑伸縮裝置和EM R樹脂彈性混凝土伸縮裝置的使用狀況進行調查，分析伸縮裝置損壞率和損壞原因。結果錶明：彈塑體無縮縫伸縮裝置損壞率最高，EM R樹脂彈性混凝土伸縮裝置其次，JFC減振防滑伸縮裝置最低（僅為6．7％，遠低于其它2種）；JFC減振防滑伸縮裝置與週邊混凝土接觸處存在細微縫隙，不存在剝離現象，運營狀況較好，其它2種與週邊混凝土剝離嚴重；該橋採用結構橫嚮分離式拓寬時，通過縱嚮伸縮裝置連接拼接縫兩側的橋麵鋪裝層基本可行，建議推廣使用JFC減振防滑伸縮裝置，併對其做針對性改良，以滿足結構受力和變形要求。
은천황하대교주교위（60＋5×90＋60） m삼향예응력혼응토T형강구교，교량탁관시，신구교상하부결구균불련접，채용종향신축장치련접신구교면판。위료해종향신축장치용우기유교량횡향탁관중적괄용성，재해교탁관완병운영7년후대탄소체무축봉신축장치、JFC감진방활신축장치화EM R수지탄성혼응토신축장치적사용상황진행조사，분석신축장치손배솔화손배원인。결과표명：탄소체무축봉신축장치손배솔최고，EM R수지탄성혼응토신축장치기차，JFC감진방활신축장치최저（부위6．7％，원저우기타2충）；JFC감진방활신축장치여주변혼응토접촉처존재세미봉극，불존재박리현상，운영상황교호，기타2충여주변혼응토박리엄중；해교채용결구횡향분리식탁관시，통과종향신축장치련접병접봉량측적교면포장층기본가행，건의추엄사용JFC감진방활신축장치，병대기주침대성개량，이만족결구수력화변형요구。
The main bridge of Yinchuan Huanghe River Bridge is a three‐directional pres‐tressed concrete T rigid‐frame bridge with span arrangement of (60+5 × 90+ 60) m .During the widening of the bridge ,the superstructures and substructures of the new and the old bridges were not connected ,but the new and old bridge decks were connected using longitudinal expansion de‐vices .To study the feasibility of applying longitudinal expansion devices to the transverse widening of existing bridges ,w hen the Yinchuan Huanghe River Bridge has been operated for more than seven years after the widening construction ,the application conditions of its longitudinal expansion devices were investigated ,including the elato‐plastic expansion devices without contraction joints , JFC expansion devices with vibration mitigation and sliding‐resistant function and the EMR resin e‐lastic concrete expansion devices .The results of the investigation demonstrate that the damage rate of the elato‐plastic expansion devices without contraction joints is the highest ,that of the EMR resin elastic concrete expansion devices ranks the second and that of the JFC expansion devices with vibration mitigation and sliding‐resistant function is the lowest (only 6 .7% ,much lower than those of the other two) .Minor seams exist in the contacting surface of the JFC vibration mitiga‐tion and sliding‐resistant devices and the surrounding concrete ,but the concrete is not disengaged , the operation condition of the bridge is good .Nevertheless ,the other two types of expansion de‐vices disengaged severely from the surrounding concrete . When the scheme of superstructure transversely‐separated widening is adopted ,using the longitudinal expansion devices to connect the bridge deck pavement on the two sides of the splicing seam is basically applicable .It is suggested that the application of JFC vibration mitigation and sliding‐resistant devices be popularized ,and be modified accordingly ,so as to meet the load bearing and deformation requirements of the struc‐ture .
