Article(id=1240702070135779948, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1240702069502440044, articleNumber=null, orderNo=null, doi=10.3963/j.issn.1001-487X.2025.03.013, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1739376000000, receivedDateStr=2025-02-13, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773736024650, onlineDateStr=2026-03-17, pubDate=1742313600000, pubDateStr=2025-03-19, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773736024650, onlineIssueDateStr=2026-03-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773736024650, creator=13701087609, updateTime=1773736024650, updator=13701087609, issue=Issue{id=1240702069502440044, tenantId=1146029695717560320, journalId=1240670690148397066, year='2025', volume='42', issue='3', pageStart='1', pageEnd='202', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1773736024499, creator=13701087609, updateTime=1773736381642, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1240703567544250807, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1240702069502440044, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1240703567544250808, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1240702069502440044, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=116, endPage=125, ext={EN=ArticleExt(id=1240702072237126259, articleId=1240702070135779948, tenantId=1146029695717560320, journalId=1240670690148397066, language=EN, title=Blasting Demolition of Prestressed Continuous Rigid-frame River-crossing Bridges in Complex Environments, columnId=1240702072073548400, journalTitle=Blasting, columnName=EXPLOSIVE DEMOLITION, runingTitle=null, highlight=null, articleAbstract=
Prestressed continuous rigid-frame bridges, a prevalent structural system in large-span bridge construction, present unique demolition challenges due to spatial constraints and adjacent infrastructure constraints during demolition. This study examined the controlled demolition of a river-crossing, prestressed, continuous, rigid-frame bridge using a blasting demolition practice. The demolition strategy incorporated mechanical crushing of mid-span deck and wing plates, complemented by strategically positioned blasting cuts at critical structural elements, including piers, mid-span box girder webs, top slabs, external prestressed steel cable anchor piers, and bridge-end box girder connections. The implementation of a sequential detonation order (mid-span box girders followed by external prestressed cable anchor piers, concluding with bridge-end connections and piers) resulted in controlled segmental collapse. Numerical simulation using LS-DYNA's dynamic finite element analysis validated the demolition scheme, revealing key process parameters: a total collapse duration of 4.5 seconds and a deck impact velocity of 13.6 m/s. The analysis identified impact stress as the primary mechanism for structural disintegration. A significant finding emerged regarding external prestressing technology. While originally implemented to enhance service performance and load-bearing capacity, the release of prestressing forces through controlled blasting was found to improve structural fragmentation efficiency significantly. Field implementation demonstrated the technical feasibility and safety of this approach, providing an effective solution for dismantling long-span, prestressed, continuous, rigid-frame bridges in complex environments. The study establishes a comprehensive framework for similar demolition projects, highlighting the importance of integrated mechanical and explosive techniques in modern bridge demolition engineering.
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JIA Yong-sheng (1970-), male, professor, mainly engaged in research and application of engineering blasting, (E-mail)
422103951@qq.com.
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预应力连续刚构桥梁是大跨径桥梁建设中广泛应用的一种结构体系,其拆除方式受到空间和周边设施的限制。结合预应力连续刚构跨河桥梁爆破拆除工程实践,对中跨桥面和翼板分别采用机械破碎方式预处理,在桥墩、中跨箱梁腹板、顶板、体外预应力钢索固定墩和桥头箱梁连接处设置爆破切口,并采取中跨箱梁→体外预应力钢索固定墩→桥头箱梁连接处、桥墩的总体起爆顺序,成功实现了桥梁逐段原地坍塌。同时,采用LS-DYNA动力学有限元软件建立三维数值模型,对总体爆破方案的合理性和桥梁倒塌过程进行数值仿真验算,结果表明:大桥倒塌全过程历时4.5 s,桥面触地速度约13.6 m/s,桥体触地冲击应力是结构解体的主导因素,体外预应力作为改善桥梁使用性能和提高结构承载力的加固技术,采用爆破的方式解除预应力有助于促进结构的充分解体。实际爆破效果表明:爆破拆除技术能够高效、安全地解决复杂环境下大跨径预应力连续刚构桥梁的拆除难题。
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王威(1986-),男,高级工程师,从事工程爆破研究与实践工作,(E-mail)13545097785@163.com。
WANG Wei (1986-), male, senior engineer, mainly engaged in engineering blasting research and practice work, (E-mail) 13545097785@163.com.
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1.Wuhan Explosion & Blasting Co., Ltd., Wuhan 430056, China
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1.武汉爆破有限公司,武汉 430056
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王威(1986-),男,高级工程师,从事工程爆破研究与实践工作,(E-mail)13545097785@163.com。
WANG Wei (1986-), male, senior engineer, mainly engaged in engineering blasting research and practice work, (E-mail) 13545097785@163.com.
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王威(1986-),男,高级工程师,从事工程爆破研究与实践工作,(E-mail)13545097785@163.com。
WANG Wei (1986-), male, senior engineer, mainly engaged in engineering blasting research and practice work, (E-mail) 13545097785@163.com.
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1.Wuhan Explosion & Blasting Co., Ltd., Wuhan 430056, China
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1.武汉爆破有限公司,武汉 430056
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Bridge type diagram(unit:cm), figureFileSmall=BXpcI2xAl/vHLUj0+tjVYw==, figureFileBig=AJSM2CPYeevg4ZVOyrsKsQ==, tableContent=null), ArticleFig(id=1240702082341204859, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图2, caption=
大桥桥型示意图(单位:cm), figureFileSmall=BXpcI2xAl/vHLUj0+tjVYw==, figureFileBig=AJSM2CPYeevg4ZVOyrsKsQ==, tableContent=null), ArticleFig(id=1240702082420896645, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 3, caption=
Section Ⅰ-Ⅰ and Section Ⅱ-Ⅱ cross sectional layout(unit:cm), figureFileSmall=KfZZkcDJkP6CIed2BodQPg==, figureFileBig=k6aAbpT1qzl8OCBw4C/9HA==, tableContent=null), ArticleFig(id=1240702082517365642, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图3, caption=
Ⅰ-Ⅰ剖面和Ⅱ-Ⅱ剖面横断面布置图(单位:cm), figureFileSmall=KfZZkcDJkP6CIed2BodQPg==, figureFileBig=k6aAbpT1qzl8OCBw4C/9HA==, tableContent=null), ArticleFig(id=1240702082618028946, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 4, caption=
Paste steel reinforcement technique, figureFileSmall=BK6LKrkvPU2nFUnGfbHgOQ==, figureFileBig=S8qiVF2HfaDPFPPPl6pPtw==, tableContent=null), ArticleFig(id=1240702082685137815, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图4, caption=
粘贴钢板加固, figureFileSmall=BK6LKrkvPU2nFUnGfbHgOQ==, figureFileBig=S8qiVF2HfaDPFPPPl6pPtw==, tableContent=null), ArticleFig(id=1240702082777412509, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 5, caption=
Strengthened by external prestressing, figureFileSmall=oyB57/cvECyxgiSavNBsaA==, figureFileBig=mjS4oLf9SRkH43hT105gdQ==, tableContent=null), ArticleFig(id=1240702082861298595, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图5, caption=
体外预应力加固, figureFileSmall=oyB57/cvECyxgiSavNBsaA==, figureFileBig=mjS4oLf9SRkH43hT105gdQ==, tableContent=null), ArticleFig(id=1240702082940990375, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 6, caption=
Schematic diagram of the overall blasting scheme(unit:cm), figureFileSmall=B8+3ZAviba4+fTg9CTUUbQ==, figureFileBig=DCEAQqkLYGwoNokGGWiwRA==, tableContent=null), ArticleFig(id=1240702083008099242, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图6, caption=
总体爆破方案示意图(单位:cm), figureFileSmall=B8+3ZAviba4+fTg9CTUUbQ==, figureFileBig=DCEAQqkLYGwoNokGGWiwRA==, tableContent=null), ArticleFig(id=1240702083096179633, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 7, caption=
Blastholes layout and charge diagram(unit:mm), figureFileSmall=bOd4FBK+DF/pq4DaO++XGg==, figureFileBig=jwIUJPRG+KP5kKI1BJ9pew==, tableContent=null), ArticleFig(id=1240702083201037236, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图7, caption=
桥墩炮孔布置及装药示意图(单位:mm), figureFileSmall=bOd4FBK+DF/pq4DaO++XGg==, figureFileBig=jwIUJPRG+KP5kKI1BJ9pew==, tableContent=null), ArticleFig(id=1240702083331060670, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 8, caption=
Initiation network diagram, figureFileSmall=pahj+FXHbfF3tiD2TZsi2w==, figureFileBig=NZIv8pKnmpkpDekLzPireg==, tableContent=null), ArticleFig(id=1240702083427529671, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图8, caption=
起爆网路示意图, figureFileSmall=pahj+FXHbfF3tiD2TZsi2w==, figureFileBig=NZIv8pKnmpkpDekLzPireg==, tableContent=null), ArticleFig(id=1240702083490444241, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 9, caption=
Numerical simulation model of Kejiadun Bridge, figureFileSmall=MHxvSo2e2YRYzevDzj6Tpg==, figureFileBig=4UHQf6NoHTmFkdeeOFcoHg==, tableContent=null), ArticleFig(id=1240702083553358807, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图9, caption=
柯家墩大桥数值仿真模型, figureFileSmall=MHxvSo2e2YRYzevDzj6Tpg==, figureFileBig=4UHQf6NoHTmFkdeeOFcoHg==, tableContent=null), ArticleFig(id=1240702085067502560, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 10, caption=
Simulation collapse results of Kejiadun Bridge, figureFileSmall=4FmlVQrni3yKttLReK7Izg==, figureFileBig=qXOIGaMOwGM1dgSzubHwAA==, tableContent=null), ArticleFig(id=1240702085180748775, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图10, caption=
柯家墩大桥倒塌模拟结果, figureFileSmall=4FmlVQrni3yKttLReK7Izg==, figureFileBig=qXOIGaMOwGM1dgSzubHwAA==, tableContent=null), ArticleFig(id=1240702085252051948, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 11, caption=
Time travel curve of bridge deck collapse velocity, figureFileSmall=Ss4uyPMbZNMvH+t3xrhOSg==, figureFileBig=jxFxWgTi/3b6svBYlglnjQ==, tableContent=null), ArticleFig(id=1240702085335938033, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图11, caption=
桥面塌落速度时程曲线, figureFileSmall=Ss4uyPMbZNMvH+t3xrhOSg==, figureFileBig=jxFxWgTi/3b6svBYlglnjQ==, tableContent=null), ArticleFig(id=1240702085407241206, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 12, caption=
Effective stress time travel curve of bridge deck monitoring point, figureFileSmall=zht70pi6i9NGs6RtjNqDiw==, figureFileBig=gXRJQ9Kk5apq6iEhQPXceQ==, tableContent=null), ArticleFig(id=1240702085512098814, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图12, caption=
桥面监测点有效应力时程曲线, figureFileSmall=zht70pi6i9NGs6RtjNqDiw==, figureFileBig=gXRJQ9Kk5apq6iEhQPXceQ==, tableContent=null), ArticleFig(id=1240702085595983874, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 13, caption=
Blasting process, figureFileSmall=mPcS3s/akwZztCnxrTzM7Q==, figureFileBig=vxf/gQ5N9O1g4XWlz3THFg==, tableContent=null), ArticleFig(id=1240702085705035785, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图13, caption=
爆破过程, figureFileSmall=mPcS3s/akwZztCnxrTzM7Q==, figureFileBig=vxf/gQ5N9O1g4XWlz3THFg==, tableContent=null), ArticleFig(id=1240702085881196563, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 14, caption=
Blasting vibration monitoring time travel curve, figureFileSmall=2fM7qL/t0wOKIHmavQmsnQ==, figureFileBig=d0nDkaumoElca8HgEvx2Iw==, tableContent=null), ArticleFig(id=1240702085977665561, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图14, caption=
爆破振动监测时程曲线, figureFileSmall=2fM7qL/t0wOKIHmavQmsnQ==, figureFileBig=d0nDkaumoElca8HgEvx2Iw==, tableContent=null), ArticleFig(id=1240702086090911774, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 15, caption=
Layout of strain monitoring points, figureFileSmall=RZo76jUsoxuVp2sSD2H7yQ==, figureFileBig=q+GRSAU9rDsXWylpRc3h0w==, tableContent=null), ArticleFig(id=1240702086216740903, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图15, caption=
应变监测点布置图, figureFileSmall=RZo76jUsoxuVp2sSD2H7yQ==, figureFileBig=q+GRSAU9rDsXWylpRc3h0w==, tableContent=null), ArticleFig(id=1240702086309015598, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Fig. 16, caption=
Strain time travel curve of each measuring point, figureFileSmall=mgHcd0OqirAjxIpaGVonNQ==, figureFileBig=R5YecPV7qtl3bFamGVpCGQ==, tableContent=null), ArticleFig(id=1240702086401290295, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=图16, caption=
各测点的应变曲线, figureFileSmall=mgHcd0OqirAjxIpaGVonNQ==, figureFileBig=R5YecPV7qtl3bFamGVpCGQ==, tableContent=null), ArticleFig(id=1240702086497759295, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=EN, label=Table 1, caption=
Blasting parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 构件名称Component | 炮孔直径Blasthole diameter/mm | 孔距Pitchrow/cm | 排距Array pitch/cm | 炮孔深度Blast hole depth/cm | 堵塞长度Stemming length/cm | 炸药单耗Unit explosive consumption/(g·m-3) | 单孔药量Single charge weight/g |
|---|
| 桥墩Pier | 40 | 25 | 35 | 90/85 | 30/35 | 2022 | 600/500 |
| 箱梁顶板Box girder top plate | 40 | 50 | 40 | 35/45 | 25/30 | 1250 | 100/150 |
| 腹板Beam web | 40 | 30 | / | 140 | 20 | 1466 | 60+60+100 |
| 桥头箱梁Bridgehead box girder | 40 | 35 | / | 140 | 50 | / | 900 |
| 外预应力固定墩External prestressed fixed pier | 40 | 35 | / | 140 | 50 | / | 900 |
), ArticleFig(id=1240702086598422597, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702070135779948, language=CN, label=表1, caption=
爆破参数表
, figureFileSmall=null, figureFileBig=null, tableContent=
| 构件名称Component | 炮孔直径Blasthole diameter/mm | 孔距Pitchrow/cm | 排距Array pitch/cm | 炮孔深度Blast hole depth/cm | 堵塞长度Stemming length/cm | 炸药单耗Unit explosive consumption/(g·m-3) | 单孔药量Single charge weight/g |
|---|
| 桥墩Pier | 40 | 25 | 35 | 90/85 | 30/35 | 2022 | 600/500 |
| 箱梁顶板Box girder top plate | 40 | 50 | 40 | 35/45 | 25/30 | 1250 | 100/150 |
| 腹板Beam web | 40 | 30 | / | 140 | 20 | 1466 | 60+60+100 |
| 桥头箱梁Bridgehead box girder | 40 | 35 | / | 140 | 50 | / | 900 |
| 外预应力固定墩External prestressed fixed pier | 40 | 35 | / | 140 | 50 | / | 900 |
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