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312蓋梁施工技術(shù)交底蓋梁施工技術(shù)交底施工單位東宏建設(shè)股份有限公司交底人接受交底人交底內(nèi)容:墩柱的混凝土強(qiáng)度達(dá)到75%設(shè)計(jì)強(qiáng)度時方可進(jìn)行首件蓋梁工程的施工,施工工序框圖如圖所示:抱箍、支架制作抱箍、支架安裝設(shè)置操作平臺支架預(yù)壓鋪設(shè)底模墩頂鑿毛、測量放樣鋼筋制作鋼筋綁扎及埋設(shè)預(yù)埋件側(cè)模安裝涂脫模劑原材檢驗(yàn)砼拌制砼運(yùn)輸砼澆筑模板拆除制作試件砼養(yǎng)護(hù)質(zhì)量檢查評定蓋梁施工工藝框圖fined20Yuan。Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan。(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan.(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan。7.5。3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million。Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment.(2)personalinjuryaccidentoccurred,thedirectpunishment0.5—10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany.(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50—100economicsanctionsagainstthem.(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500—1000punishment.(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis。Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationfor一、主要施工工序1.1、安裝抱箍和支架首件蓋梁采用鋼抱箍施工,鋼抱箍由專門廠家制作,每個抱箍使用前必須進(jìn)行試拼,抱箍試拼可在墩柱底進(jìn)行.鋼抱箍內(nèi)側(cè)與墩柱接觸處用橡膠皮等柔性環(huán)包,以增大墩身與抱箍間的摩擦力,并避免鋼抱箍與墩柱間的鋼性接觸,損傷混凝土表面。抱箍安裝時,人工將要施工的蓋梁下方地基大致整平,在平整好的地基上人工搭設(shè)鋼管輔助支架,輔助支架的作用是給抱箍安裝提供一個臨時支撐,方便安裝。輔助支架的高度以不影響模板和鋼筋安裝施工為準(zhǔn).。抱箍安裝好后在橋墩上抱箍下方作好標(biāo)記,然后將工字鋼安裝在抱箍牛腿上,為防止兩個工字鋼側(cè)向傾覆,兩根工字鋼間采用對拉螺栓穿過工字鋼腹板連接固定。在工字鋼上安放方木,方木間距20cm,兩端用鐵絲綁扎固,方木安裝完成后即安裝底模和操作平臺護(hù)欄。在工字鋼上安裝方木后進(jìn)行預(yù)壓施工,預(yù)壓采用土袋進(jìn)行,土袋重量按設(shè)計(jì)蓋梁重量50%、100%分級加載(加載重量按蓋梁混凝土方量計(jì)算),每級間隔2h。在支架兩端,中部各選兩點(diǎn)進(jìn)行觀測,觀測加載前后撓度變化,最大撓度不大于跨度的1/400,支架無異常變形可認(rèn)為支架承載力合格。根據(jù)預(yù)壓結(jié)果確定支架的搭設(shè)高度和設(shè)置跨中預(yù)拱度。1.2、測量放樣蓋梁預(yù)壓完成后進(jìn)行底模鋪設(shè),底模采用優(yōu)質(zhì)竹膠板,拼縫采用透明膠帶粘貼,鋪設(shè)好底模后立即進(jìn)行測量放樣。根據(jù)現(xiàn)場控制點(diǎn),用全站儀測出立柱頂面中心點(diǎn),并用紅色記號筆做出標(biāo)記,同時記錄中心點(diǎn)標(biāo)高.根據(jù)蓋梁的尺寸定出模板安裝的邊線,彈施工線,經(jīng)主管技術(shù)負(fù)責(zé)人員和監(jiān)理復(fù)核后安裝鋼筋和模板.1.3、鋼筋制作和安裝(1)鋼筋加工所有鋼筋的截?cái)嗉皬澢阡摻罴庸鰞?nèi)進(jìn)行。每種型號鋼筋在鋼筋加工場加工,然后運(yùn)至處理好的蓋梁底板上進(jìn)行綁扎。鋼筋加工尺寸和型號必須按設(shè)計(jì)圖紙進(jìn)行驗(yàn)收。鋼筋按圖紙所示的形狀進(jìn)行彎曲,并且均要冷彎。主筋的彎曲及標(biāo)準(zhǔn)彎鉤要按圖紙規(guī)定加工,箍筋的端部按圖紙規(guī)定設(shè)置彎鉤。蓋梁骨架統(tǒng)一在鋼筋加工場焊接成型,鋼筋焊接采用雙面搭接焊,搭接長度大于等于5d。鋼筋焊接后各項(xiàng)指標(biāo)必須達(dá)到規(guī)范和設(shè)計(jì)要求.鋼筋焊接的焊縫表面應(yīng)飽滿、平整,不得有燒傷、焊瘤、裂紋等。受力鋼筋焊接必須保證焊縫質(zhì)量,接頭不允fined20Yuan.Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan。(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan。(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan。7。5。3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million。Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment。(2)personalinjuryaccidentoccurred,thedirectpunishment0.5—10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany。(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50—100economicsanctionsagainstthem.(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500—1000punishment.(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis.Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationfor許放到最大彎距處,同時抗拉區(qū)接頭面積不大于50%。(2)鋼筋安裝鋼筋加工完成后用平板車運(yùn)到現(xiàn)場,吊車吊裝到蓋梁底模上進(jìn)行綁扎。鋼筋綁扎前要核對蓋梁和骨架的類型,與加工的鋼筋半成品對號入座。箍筋與受力鋼筋垂直設(shè)置.鋼筋綁扎過程中,用臨時框架加以固定,增加鋼筋骨架整體穩(wěn)定性,鋼筋骨架基本成型后,為了確保鋼筋在混凝土中有一定厚度的保護(hù)層,用砼墊塊呈有序布置在鋼筋骨架兩側(cè),且呈梅花型布置。鋼筋安裝完成后進(jìn)行自檢,合格后通知監(jiān)理驗(yàn)收。1.4、模板安裝(1)橋墩蓋梁的側(cè)模和端模采用鋼模板,兩側(cè)倒角采用鋼結(jié)構(gòu)三角架,底模采用竹膠板,鋼模板由專門廠家生產(chǎn)。(2)根據(jù)蓋梁底面設(shè)計(jì)標(biāo)高和底模厚度,及工字鋼和方木高度,來計(jì)算確定抱箍的位置。在抱箍上架2根36型工字鋼,工字鋼上平鋪方木,在方木上鋪設(shè)底模。在混凝土澆筑前在立柱中間部位搭門式支架作為支撐,支架底部支撐在系梁頂面上。(3)鋼筋骨架綁扎完成且經(jīng)過監(jiān)理工程師檢驗(yàn)合格后支立側(cè)模和端模。側(cè)模和端?,F(xiàn)場用25T吊車吊裝,模板安裝時要注意臨時固定,成型后采用上下設(shè)置φ16對拉螺栓固定。(4)模板安裝充許偏差模板安裝的允許偏差序號項(xiàng)目允許偏差(mm)1模板標(biāo)高?152模板內(nèi)部尺寸?303軸線偏位154模板相鄰兩板表面高低差25模板表面平整56預(yù)埋件中心線位置37預(yù)留孔洞中心線位置108預(yù)留孔洞截面內(nèi)部尺寸+10,01。5、混凝土澆筑(1)澆筑砼過程中嚴(yán)格按照設(shè)計(jì)配合比調(diào)整好施工配比。(2)砼澆筑連續(xù)澆筑,以防造成施工冷縫。(3)混凝土水平運(yùn)輸采用混凝土罐車運(yùn)輸,運(yùn)輸混凝土以2,4r/min的轉(zhuǎn)速攪動,fined20Yuan。Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan。(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan。(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan.7。5。3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million。Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment。(2)personalinjuryaccidentoccurred,thedirectpunishment0.5-10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany.(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50—100economicsanctionsagainstthem。(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500—1000punishment。(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis.Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationfor垂直運(yùn)輸采用25t吊車配合料斗入模.(4)混凝土按一定的厚度、順序和方向分層,從澆筑跨中向澆筑兩端懸臂部分對稱澆筑,在下層混凝土初凝或能重塑前澆筑完上層混凝土,蓋梁砼一次澆筑厚度不超過30cm,澆筑至蓋梁頂部時,采取措施排除砼的泌水;當(dāng)混凝土表面出現(xiàn)析水時,及時予以清除,不得擾動已澆筑的混凝土。(5)混凝土的振搗選派有豐富經(jīng)驗(yàn)有責(zé)任心的混凝土工專人負(fù)責(zé)?;炷琳駬v采用插入式振搗棒,振動棒插入采用先外后內(nèi)、快插慢拔的方法,振動點(diǎn)振搗延續(xù)時間20~30s,以混凝土不再沉落、不出現(xiàn)氣泡、表面呈現(xiàn)浮漿為度。振搗棒插入到下層混凝土5~10cm,并防止漏振與過振。避免振搗棒與鋼筋接觸,并與模板保持15cm左右的距離。(6)在混凝土澆筑前,應(yīng)對全部設(shè)備進(jìn)行全面檢查試驗(yàn),確保施工中運(yùn)轉(zhuǎn)正常,在澆筑過程中應(yīng)派專人檢查模板、支架、鋼筋等狀態(tài),如有變形、移位或沉陷等現(xiàn)象應(yīng)立刻停止?jié)仓?,待校正處理好后方可繼續(xù);(7)在澆筑蓋梁混凝土?xí)r,按要求留取砼試件.根據(jù)《公路工程質(zhì)量檢驗(yàn)評定標(biāo)準(zhǔn)》第一冊附錄D水泥混凝土抗壓強(qiáng)度評定之相關(guān)規(guī)定,每片蓋梁取2組試塊.試塊要灑水養(yǎng)生,脫模后在試件上標(biāo)明試件制作日期及代表工程編號,然后放置在標(biāo)準(zhǔn)養(yǎng)生室養(yǎng)護(hù)。1。6、砼養(yǎng)生與模板拆除(1)砼初凝后進(jìn)行二次收漿抹面,然后用土工布和塑料薄膜覆蓋養(yǎng)生,混凝土澆筑完成后,應(yīng)在混凝土表面初凝后予以覆蓋和灑水養(yǎng)護(hù)。覆蓋時不得損傷或污染混凝土的表面。(2)混凝土的灑水養(yǎng)護(hù)時間為7d.養(yǎng)生時采用土工布覆蓋灑水。(3)砼強(qiáng)度達(dá)2。5MPa時進(jìn)行側(cè)模拆除,拆除時要安排專人指揮和監(jiān)督,保證其表面以及棱角不因拆模而導(dǎo)致?lián)p壞。在混凝土強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的75%時,拆除底模。1.7、施工注意事項(xiàng)(1)、墩身頂面必須認(rèn)真鑿毛,鑿毛時一定要認(rèn)真細(xì)致,確保不損壞墩頂側(cè)面砼。墩身強(qiáng)度達(dá)到70%以上方可進(jìn)行蓋梁施工,確保墩身砼養(yǎng)生期和后期砼強(qiáng)度達(dá)到設(shè)計(jì)要求。對已鑿毛清理干凈的墩身其頂面由測量組放出蓋梁底中心線,并測出墩身頂面偏位情況,以便控制蓋梁底模位置。(2)、要加強(qiáng)蓋梁底模和墩身接觸面的模板安裝工作,確保無空隙不露漿。(3)、蓋梁支架由鋼抱箍和型鋼組成,其安裝要按設(shè)計(jì)要求,確保支架不變形。fined20Yuan。Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan.(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan.(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan。7.5。3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million.Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment.(2)personalinjuryaccidentoccurred,thedirectpunishment0.5-10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany。(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50-100economicsanctionsagainstthem。(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500—1000punishment。(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis。Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationfor(4)、拉桿要緊固牢靠,反復(fù)檢查,確保蓋梁外形尺寸準(zhǔn)確,不得有滑絲現(xiàn)象。側(cè)模及底模接縫螺栓要上全、上緊,保證拼縫無錯臺,并在澆筑砼時不會有明顯變形.(5)、蓋梁頂面要二次收漿,確保砼表面密實(shí)、平整。(6)、支架和底模拆除一定要在砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的75%以上時才可拆除,拆除前要經(jīng)過技術(shù)人員的同意和根據(jù)試驗(yàn)室提供的數(shù)據(jù)為準(zhǔn),不允許強(qiáng)度較低時拆除,以防造成蓋梁出現(xiàn)質(zhì)量問題。拆除模板時不允許撬棍損壞砼表面及蓋梁結(jié)構(gòu)棱角,確保砼結(jié)構(gòu)外觀完整。(7)、對蓋梁施工是被水泥漿污染的墩身表面要認(rèn)真清除并不得損壞墩身表面砼,確保墩身外觀質(zhì)量。二、質(zhì)量控制措施?、鋼筋間距、鋼筋保護(hù)層不滿足規(guī)范要求蓋梁鋼筋間距、鋼筋保護(hù)層不滿足規(guī)范要求主要從模板施工、鋼筋施工、砼澆筑和質(zhì)量檢查等方面進(jìn)行控制。控制措施如下:A、模板施工控制:蓋梁模板采用定型鋼模,由專業(yè)廠家加工生產(chǎn),進(jìn)場后進(jìn)行預(yù)拼裝,以保證模板制作及安裝精度。模板拼裝完成后采用全站儀校正模板,保證模板安裝符合規(guī)范要求。安裝模板時要小心輕放,避免損壞或造成墊塊移位。模板安裝后,加強(qiáng)對墊塊復(fù)查,如有損壞或移位及時進(jìn)行更換。B、鋼筋綁扎及墊塊定位:為了保證首件蓋梁鋼筋保護(hù)層,蓋梁鋼筋施工時,按照0.5?一個墊塊的密度,梅花形布置水泥墊塊.C、混凝土澆筑控制:在混凝土澆筑振搗過程中注意對墊塊的保護(hù),避免振搗棒觸到鋼筋、模板及墊塊。另外,在澆筑中安排專人檢查模板及支架的穩(wěn)固和支撐情況,避免出現(xiàn)模板移位.D、加強(qiáng)質(zhì)量檢查:提高施工人員質(zhì)量意識,加強(qiáng)工作責(zé)任心,認(rèn)真進(jìn)行自檢,自檢合格后請監(jiān)理工程師驗(yàn)收.?、蓋梁混凝土裂紋、裂縫造成蓋梁混凝土裂紋、裂縫主要原因是水泥安定性不合格、養(yǎng)護(hù)不及時、拆模時間不當(dāng)及混凝土水化熱影響。防治措施:A、采用安定性合格的水泥:避免因安定性不合格造成混凝土開裂。B、加強(qiáng)養(yǎng)護(hù):及時灑水保持表面濕潤,養(yǎng)生時間不小于7天。避免同一結(jié)構(gòu)物的不同位置溫差大,導(dǎo)致混凝土凝固時因收縮后產(chǎn)生的收縮應(yīng)力超過混凝土極限抗拉強(qiáng)度或內(nèi)外溫差大表面抗拉應(yīng)力超過混凝土極限抗拉強(qiáng)度而產(chǎn)生裂縫。fined20Yuan。Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan.(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan。(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan.7。5。3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million。Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment.(2)personalinjuryaccidentoccurred,thedirectpunishment0。5—10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany.(3)personalinjuryaccidentoccurs,thedirectpunishment500—1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50—100economicsanctionsagainstthem.(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500-1000punishment。(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis.Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationforC、水化熱控制:改善骨料級配、降低水灰比、摻加粉煤灰等、摻加緩凝劑。采用遮陽涼棚的降溫措施施,降低混凝土水化熱、推遲水化熱峰值出現(xiàn)。?、蓋梁混凝土表面有蜂窩、麻面、氣孔造成蓋梁混凝土表面有蜂窩、麻面、氣孔主要原因是混凝土漏振,模板接縫不嚴(yán)密等。防治措施:??;炷翝仓^程中插入式振動器的移動間距不應(yīng)超過其作用半徑的1(5倍,與側(cè)模應(yīng)保持5~10cm的距離,插入下層混凝土5~10cm的深度。砼振搗應(yīng)達(dá)到其不再沉落,表面不出現(xiàn)氣泡,呈現(xiàn)出浮漿為度。做到不漏振,不過振;注意振搗方法,嚴(yán)格控制振搗程序,先周圍后中間,振搗時,振動棒不要碰撞鋼筋、模板、預(yù)埋件等,注意保護(hù)層砂漿墊塊處的混凝土振搗。?(控制混凝土分層澆筑厚度,對于插入式及附著式振動器不宜超過300mm。?(蓋梁模板采用定型鋼模,由專業(yè)廠家加工生產(chǎn),保證模板制作及安裝精度。模板拼接緊密,拼縫位置粘貼橡膠條,防止漏漿。?、蓋梁混凝土構(gòu)件表面泌水,色差大造成蓋梁混凝土構(gòu)件表面泌水,色差大主要是由于混凝土振搗不密實(shí)、漏振,混凝土原材料問題、拌和不均勻等。防治措施:A、原材料控制:?.選擇同一產(chǎn)地、同一品牌、同一顏色的水泥、砂、碎石和外加劑等原材料,并且同一單位工程盡量采用同一批原材料.?.加強(qiáng)水泥現(xiàn)場檢查。?。檢查水泥的儲存條件,嚴(yán)禁使用過期或被雨水淋濕的水泥.B、混凝土拌和控制:?。嚴(yán)格控制混凝土配合比設(shè)計(jì),合理選用水泥標(biāo)號。?建立原材料計(jì)量崗位責(zé)任制,計(jì)量方法簡單可靠。?.嚴(yán)格控制水灰比,保持混凝土良好的和易性。?。嚴(yán)格控制混凝土坍落度。?。嚴(yán)格控制外加劑,必須按有關(guān)標(biāo)準(zhǔn)鑒定合格并經(jīng)試驗(yàn)符合施工要求方可使用。C、施工過程控制?、選擇50振搗棒振搗,振搗棒的移動間距不應(yīng)超過其作用半徑的1(5倍,即30cm—40cm。與側(cè)模保持5~10cm的距離,插入下層混凝土5~10cm的深度。做到不漏振,不過振。振搗時間以控制混凝土表面無氣泡,不下沉,表面泛漿為準(zhǔn).?、砼澆筑完成后及時養(yǎng)護(hù),養(yǎng)護(hù)時間不能少于7天.三、質(zhì)量控制指標(biāo)、檢驗(yàn)頻率和方法3.1鋼筋質(zhì)量檢查?、基本要求:fined20Yuan。Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan.(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan.(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan。7.5.3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million.Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment。(2)personalinjuryaccidentoccurred,thedirectpunishment0。5—10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany。(3)personalinjuryaccidentoccurs,thedirectpunishment500—1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50-100economicsanctionsagainstthem。(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500-1000punishment。(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis.Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationfor1)鋼筋、機(jī)械連接器、焊條等的品種、規(guī)格和技術(shù)性能應(yīng)符合國家現(xiàn)行標(biāo)準(zhǔn)規(guī)定和設(shè)計(jì)要求。2)冷拉鋼筋的機(jī)械性能必須符合規(guī)范要求,鋼筋平直,表面不應(yīng)有裂皮和油污。3)受力鋼筋同一截面的接頭數(shù)量、搭接長度、焊接和機(jī)械接頭質(zhì)量應(yīng)符合施工技術(shù)規(guī)范要求。4)鋼筋安裝時,必須保證設(shè)計(jì)要求的鋼筋根數(shù)。5)受力鋼筋應(yīng)平直,表面不得有裂紋及其它損傷。?、鋼筋質(zhì)量檢查實(shí)測項(xiàng)目鋼筋安裝實(shí)測項(xiàng)目規(guī)定值或允項(xiàng)次檢查項(xiàng)目檢查方法和頻率許偏差兩排以上排距?5受力鋼梁、板、拱肋?10尺量:每構(gòu)件檢查2個1?筋間距同排基礎(chǔ)、錨碇、墩臺、柱?20斷面(mm)灌注樁?20尺量:每構(gòu)件檢查5~102箍筋、橫向水平鋼筋、螺旋筋間距(mm)?10個間距長?10尺量:按骨架總數(shù)30%3鋼筋骨架尺寸抽查寬、高或直徑?54彎起鋼筋位置(mm)?20尺量:每骨架抽查30%柱、梁、拱肋?5保護(hù)層厚尺量:每構(gòu)件沿模板周5基礎(chǔ)、錨碇、墩臺?10度(mm)邊檢查8處板?3?、外觀鑒定1)鋼筋表面無鐵銹及焊渣。2)多層鋼筋網(wǎng)要有足夠的鋼筋支撐,保證骨架的施工剛度.3。2混凝土質(zhì)量檢查?、基本要求1)混凝土所用的水泥、砂、石、水、外摻劑及混合材料的質(zhì)量和規(guī)格,必須符合有關(guān)技術(shù)規(guī)范的要求,按規(guī)定的配合比施工。2)不得出現(xiàn)空洞和露筋現(xiàn)象。?、實(shí)測項(xiàng)目蓋梁實(shí)測項(xiàng)目記錄表項(xiàng)次項(xiàng)目規(guī)定值或允許偏差檢查方法和頻率1混凝土強(qiáng)度(Mpa)在合格標(biāo)準(zhǔn)內(nèi)按附錄D檢查fined20Yuan.Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan。(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunitfined200Yuan,constructionpersoninchargeafineof50Yuan.(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan。7.5.3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million.Directresponsibilityfortheaccidentandhavethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment。(2)personalinjuryaccidentoccurred,thedirectpunishment0。5-10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany.(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoisdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50-100economicsanctionsagainstthem。(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500-1000punishment。(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis。Eight,shouldperformintheconstructionstandardsandspecifications,standardspecificationfor2斷面尺寸(mm)?

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