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Blasting Demolition of a 21-story Full Shear Wall Structure Building
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- Time of issue:2019-05-05 15:28
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(Summary description)Completiontime:June2004 ProjectLocation:WuningTown,DongyangCity,ZhejiangProvince Completedunit:ZhejiangJinganBlastingEngineeringCo.,Ltd. Projecthostandparticipants:WangXiaMing,ChengCailin,GuPing,DuZhonglong,HeHuawei ContributedbyChengCailinandDuZhonglong 1ProjectOverview TheWuningTownGovernmentBuildingofDongyangCityislocatedattheintersectionofRenminRoadandZhenxingRoadinDongyangCity,ZhejiangProvince.Theeastsideisabout18mawayfromRenminRoad,thesouthsideisabout50mawayfromZhenxingRoad,thenorthsideis25mfortheNationalLandBuilding,andthewestis9mforresidentialbuildings. Thebuildingisdividedintotwoparts,themainbuildingandthepodium.Itfacessouthandisintheshapeofa“sail”. Themainbuildinghas19floorsintheeasthalfand2layersinthewesthalf.Thetotalheightis70.3mandthebuildingareaisaboutl1000m. . Themainbuildingisafullshearwallstructure,withthe"work"shapeshearwallasthemainload-bearingmember,thecontactbeamasthelapjointmember,theeast-westspanplustheelevatorshaftforthesevencolumns,thenorth-southspanplusthecorridorforthethree-span,thewestsideofthemainbuildingTherearedoubleelevatorshaftsandinnerstairs.Therearesingleelevatorshaftsandinnerstairsontheeastside.Theeastandwestsidesofthebuildingareasymmetricalinstructure;themainbuildingisafour-storypodiuminthesouth,northandwest,whichisaframestructure. ThesurroundingenvironmentofthebuildingisshowninFigure1. 2Characteristicsanddifficultiesofthedemolitionproject (1)Thebuildingtobedemolishedisafullshearwallstructure.Duetotheasymmetricalstructureontheeastandwestsidesofthebuilding,theheightisdifferent,andthecenterofgravityiswestward.Therefore,theopeningstressoftheblastinggapisbalancedtoensuretheaccuracyofthedirectionaldumpingaftertheexplosion. TheplanestructureofthebuildingisshowninFigure2. (2)Thebuildingislocatedinthedowntownarea,andtherearemanybuildings(structures)tobeprotected.Itis9mfromthewestofthebuildingand45mfromthesouth.Thereareoverheadpowerlinesandcommunicationlinesonthesouthrevitalizationroad.55m;12montheeastsidehasavarietyofimportantpipelinefacilitiessuchasundergroundcommunicationcables,militaryopticalcables,undergroundcables,etc.,andthereareф600mmcementwatersupplypipesat17montheeastside. (3)Becausetheconstructionperiodisonly20days,plustheconstructioniscatchingupwiththestudents'collegeentranceexaminationandthemiddleschoolentranceexaminationperiod,itisimpossibletoworkovertimeatnight,whichbringsgreatdifficultytotheconstructionprogress. 3Selectionofblastingdemolitionplan Accordingtotheon-siteenvironmentalconditionsandthestructuralcharacteristicsofthebuilding,ablastingdemolitionschemewithmultiplegapstothesouthisused. 3.1Blastinggap Themaximumnotchheightofthelowernotch,theformula:H=Btanф IntheformulaB-thewidthofthebuilding,B=16.2m;ф-thenotchelevationangle,takeф=41°,tanф=0.87. ThesurrogatevalueiscalculatedasH=14.1m. Theheightofthetoppanelofthefourthfloorofthebuildingisjust14.1m,whichmeansthatthefrontrowcanbefrieduptothefourthfloor. Inordertomakethebuildingcollapsesmoothly,theheightoftheelevatorshaftandthestairwellisincreasedbyonelayerhigherthantheheightofthefrontrowofcolumns. Twoauxiliarygapsareopenedinthe9thto10thfloorsand14thto15thfloorsofthebuilding.TheinternalI-shapedshearwallisalsopre-treatedanddrilledandblasted.TheblastinggapandtheholeareshowninFigure3. 3.2Pretreatmentofshearwall Themainbuildingisdividedintofrontandreartwo-spanI-shapedshearwalls,thatis,thenorthandsouthspans.Inordertoreducethedrillingandblastingworkload,theintermediatepre-treatmentcanformfourrowsofload-bearingcolumnswithT-shapedends,whichbecomethemainbearingofthemainbuilding.Thecomponentisthendrilledandblasted. Thethreeprinciplesofshearwallpre-cuttingare:1)theprincipleofensuringthesafetyandstabilityofthebuildingbeforeexplosion;2)theprincipleofretainingtheshearwallnode;3)theprincipleofnormalizingthepost-bodyshearwallcolumn. 3.3drillingandblastingparameters ThebuildingtobeexplodedismainlycarriedbytheI-shapedshearwall.Theblastholesontheshearwallarearrangedintwoways,namelyverticalshallowholes.Inordertoensuretheblastingeffect,theflyingstoneiscontrolled,andthelongitudinaldrillingparalleltotheshearwallisdecided.. Calculationofblastingparameters:theapertureф=38~40mm,theminimumresistancelineisl/2ofthethicknessoftheshearwall,ieW=O.125m,theholespacingδ=(1.5~2.0)W(m),takeδ=20~25cm,theholedepthListhewidthoftheshearwallwallminus25cm,ifthewallwidthexceeds1.5m,youcanentertheholefrombothsidesoftheshearwallsection. Attheelevatorshaft,themaximumholedepthontheshearwallis2.6m,andthecenterlineoftheblastholeisnotmorethan2cmparalleltotheshearwall. Atotalof1,720longitudinalholesarearrangedontheshearwallcolumn,whichisabout2095meters. Thethin-wallstructureoftheshearwallis1000-1200g/m3forthebottomexplosive.Thesingle-explosionconsumptionofthetwo-layerexplosiveis800g/m3,andtheexplosiveconsumptionoftheuppertwoblastingshearwallsiscontrolledat600g/m3. 4Constructionprocess 4.1Deferredsegmentationanddetonationnetwork Thenon-electricdetonatorsofMS2,HS2,HS3andHS4aredetonatedintheholeofthe1~4rowofshearholes
Blasting Demolition of a 21-story Full Shear Wall Structure Building
(Summary description)Completiontime:June2004 ProjectLocation:WuningTown,DongyangCity,ZhejiangProvince Completedunit:ZhejiangJinganBlastingEngineeringCo.,Ltd. Projecthostandparticipants:WangXiaMing,ChengCailin,GuPing,DuZhonglong,HeHuawei ContributedbyChengCailinandDuZhonglong 1ProjectOverview TheWuningTownGovernmentBuildingofDongyangCityislocatedattheintersectionofRenminRoadandZhenxingRoadinDongyangCity,ZhejiangProvince.Theeastsideisabout18mawayfromRenminRoad,thesouthsideisabout50mawayfromZhenxingRoad,thenorthsideis25mfortheNationalLandBuilding,andthewestis9mforresidentialbuildings. Thebuildingisdividedintotwoparts,themainbuildingandthepodium.Itfacessouthandisintheshapeofa“sail”. Themainbuildinghas19floorsintheeasthalfand2layersinthewesthalf.Thetotalheightis70.3mandthebuildingareaisaboutl1000m. . Themainbuildingisafullshearwallstructure,withthe"work"shapeshearwallasthemainload-bearingmember,thecontactbeamasthelapjointmember,theeast-westspanplustheelevatorshaftforthesevencolumns,thenorth-southspanplusthecorridorforthethree-span,thewestsideofthemainbuildingTherearedoubleelevatorshaftsandinnerstairs.Therearesingleelevatorshaftsandinnerstairsontheeastside.Theeastandwestsidesofthebuildingareasymmetricalinstructure;themainbuildingisafour-storypodiuminthesouth,northandwest,whichisaframestructure. ThesurroundingenvironmentofthebuildingisshowninFigure1. 2Characteristicsanddifficultiesofthedemolitionproject (1)Thebuildingtobedemolishedisafullshearwallstructure.Duetotheasymmetricalstructureontheeastandwestsidesofthebuilding,theheightisdifferent,andthecenterofgravityiswestward.Therefore,theopeningstressoftheblastinggapisbalancedtoensuretheaccuracyofthedirectionaldumpingaftertheexplosion. TheplanestructureofthebuildingisshowninFigure2. (2)Thebuildingislocatedinthedowntownarea,andtherearemanybuildings(structures)tobeprotected.Itis9mfromthewestofthebuildingand45mfromthesouth.Thereareoverheadpowerlinesandcommunicationlinesonthesouthrevitalizationroad.55m;12montheeastsidehasavarietyofimportantpipelinefacilitiessuchasundergroundcommunicationcables,militaryopticalcables,undergroundcables,etc.,andthereareф600mmcementwatersupplypipesat17montheeastside. (3)Becausetheconstructionperiodisonly20days,plustheconstructioniscatchingupwiththestudents'collegeentranceexaminationandthemiddleschoolentranceexaminationperiod,itisimpossibletoworkovertimeatnight,whichbringsgreatdifficultytotheconstructionprogress. 3Selectionofblastingdemolitionplan Accordingtotheon-siteenvironmentalconditionsandthestructuralcharacteristicsofthebuilding,ablastingdemolitionschemewithmultiplegapstothesouthisused. 3.1Blastinggap Themaximumnotchheightofthelowernotch,theformula:H=Btanф IntheformulaB-thewidthofthebuilding,B=16.2m;ф-thenotchelevationangle,takeф=41°,tanф=0.87. ThesurrogatevalueiscalculatedasH=14.1m. Theheightofthetoppanelofthefourthfloorofthebuildingisjust14.1m,whichmeansthatthefrontrowcanbefrieduptothefourthfloor. Inordertomakethebuildingcollapsesmoothly,theheightoftheelevatorshaftandthestairwellisincreasedbyonelayerhigherthantheheightofthefrontrowofcolumns. Twoauxiliarygapsareopenedinthe9thto10thfloorsand14thto15thfloorsofthebuilding.TheinternalI-shapedshearwallisalsopre-treatedanddrilledandblasted.TheblastinggapandtheholeareshowninFigure3. 3.2Pretreatmentofshearwall Themainbuildingisdividedintofrontandreartwo-spanI-shapedshearwalls,thatis,thenorthandsouthspans.Inordertoreducethedrillingandblastingworkload,theintermediatepre-treatmentcanformfourrowsofload-bearingcolumnswithT-shapedends,whichbecomethemainbearingofthemainbuilding.Thecomponentisthendrilledandblasted. Thethreeprinciplesofshearwallpre-cuttingare:1)theprincipleofensuringthesafetyandstabilityofthebuildingbeforeexplosion;2)theprincipleofretainingtheshearwallnode;3)theprincipleofnormalizingthepost-bodyshearwallcolumn. 3.3drillingandblastingparameters ThebuildingtobeexplodedismainlycarriedbytheI-shapedshearwall.Theblastholesontheshearwallarearrangedintwoways,namelyverticalshallowholes.Inordertoensuretheblastingeffect,theflyingstoneiscontrolled,andthelongitudinaldrillingparalleltotheshearwallisdecided.. Calculationofblastingparameters:theapertureф=38~40mm,theminimumresistancelineisl/2ofthethicknessoftheshearwall,ieW=O.125m,theholespacingδ=(1.5~2.0)W(m),takeδ=20~25cm,theholedepthListhewidthoftheshearwallwallminus25cm,ifthewallwidthexceeds1.5m,youcanentertheholefrombothsidesoftheshearwallsection. Attheelevatorshaft,themaximumholedepthontheshearwallis2.6m,andthecenterlineoftheblastholeisnotmorethan2cmparalleltotheshearwall. Atotalof1,720longitudinalholesarearrangedontheshearwallcolumn,whichisabout2095meters. Thethin-wallstructureoftheshearwallis1000-1200g/m3forthebottomexplosive.Thesingle-explosionconsumptionofthetwo-layerexplosiveis800g/m3,andtheexplosiveconsumptionoftheuppertwoblastingshearwallsiscontrolledat600g/m3. 4Constructionprocess 4.1Deferredsegmentationanddetonationnetwork Thenon-electricdetonatorsofMS2,HS2,HS3andHS4aredetonatedintheholeofthe1~4rowofshearholes
- Categories:case study
- Author:
- Origin:
- Time of issue:2019-05-05 15:28
- Views:3
Completion time: June 2004
Project Location: Wuning Town, Dongyang City, Zhejiang Province
Completed unit: Zhejiang Jingan Blasting Engineering Co., Ltd.
Project host and participants: Wang Xia Ming, Cheng Cailin, Gu Ping, Du Zhonglong, He Huawei
Contributed by Cheng Cailin and Du Zhonglong
1 Project Overview
The Wuning Town Government Building of Dongyang City is located at the intersection of Renmin Road and Zhenxing Road in Dongyang City, Zhejiang Province. The east side is about 18m away from Renmin Road, the south side is about 50m away from Zhenxing Road, the north side is 25m for the National Land Building, and the west is 9m for residential buildings.
The building is divided into two parts, the main building and the podium. It faces south and is in the shape of a “sail”. The main building has 19 floors in the east half and 2 layers in the west half. The total height is 70.3m and the building area is about l1000m. . The main building is a full shear wall structure, with the "work" shape shear wall as the main load-bearing member, the contact beam as the lap joint member, the east-west span plus the elevator shaft for the seven columns, the north-south span plus the corridor for the three-span, the west side of the main building There are double elevator shafts and inner stairs. There are single elevator shafts and inner stairs on the east side. The east and west sides of the building are asymmetrical in structure; the main building is a four-story podium in the south, north and west, which is a frame structure. The surrounding environment of the building is shown in Figure 1.
2 Characteristics and difficulties of the demolition project
(1) The building to be demolished is a full shear wall structure. Due to the asymmetrical structure on the east and west sides of the building, the height is different, and the center of gravity is westward. Therefore, the opening stress of the blasting gap is balanced to ensure the accuracy of the directional dumping after the explosion.
The plane structure of the building is shown in Figure 2.
(2) The building is located in the downtown area, and there are many buildings (structures) to be protected. It is 9m from the west of the building and 45m from the south. There are overhead power lines and communication lines on the south revitalization road. 55m; 12m on the east side has a variety of important pipeline facilities such as underground communication cables, military optical cables, underground cables, etc., and there are ф600mm cement water supply pipes at 17m on the east side.
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