d.砼澆筑工藝(yi)流程：

e.混凝(ning)土澆(jiao)筑施工控(kong)制要點：

①模板(ban)(ban)(ban)(ban)(ban)安裝：模板(ban)(ban)(ban)(ban)(ban)必須具有足夠的強度和剛度。立模時應(ying)(ying)(ying)設足夠的支(zhi)撐，以保證(zheng)在混凝土振實時不(bu)(bu)松動或變(bian)行。在模板(ban)(ban)(ban)(ban)(ban)內(nei)(nei)側(ce)應(ying)(ying)(ying)均勻薄(bo)涂脫(tuo)(tuo)模劑，以利脫(tuo)(tuo)模，模板(ban)(ban)(ban)(ban)(ban)應(ying)(ying)(ying)根據放樣的位(wei)置(zhi)(zhi)，準確安裝，支(zhi)撐應(ying)(ying)(ying)牢(lao)固，底(di)面與基層表面應(ying)(ying)(ying)密貼，以防漏漿(jiang)。接(jie)頭(tou)（包括企口接(jie)頭(tou)）應(ying)(ying)(ying)嚴密無(wu)隙(xi)，不(bu)(bu)得(de)有離縫(feng)、錯(cuo)縫(feng)。頂面應(ying)(ying)(ying)齊平(ping)(ping)，不(bu)(bu)得(de)有高低錯(cuo)落(luo)。按設計(ji)的縱縫(feng)位(wei)置(zhi)(zhi)放線(xian)，安放捆板(ban)(ban)(ban)(ban)(ban)和下支(zhi)撐，把模板(ban)(ban)(ban)(ban)(ban)的平(ping)(ping)面位(wei)置(zhi)(zhi)正確固定下來(lai)。模板(ban)(ban)(ban)(ban)(ban)安裝支(zhi)撐可用木(mu)料(liao)或扁鐵，支(zhi)撐音的距(ju)離為(wei)40cm左(zuo)右(you)；內(nei)(nei)側(ce)固定鐵釬間距(ju)為(wei)100cm左(zuo)右(you)，外(wai)側(ce)受力鐵釬間距(ju)為(wei)50cm左(zuo)右(you)，內(nei)(nei)側(ce)鐵釬位(wei)置(zhi)(zhi)應(ying)(ying)(ying)交錯(cuo)，捆板(ban)(ban)(ban)(ban)(ban)可用厚度7.5～10cm,寬15～20cm的木(mu)板(ban)(ban)(ban)(ban)(ban)。

②按設計(ji)厚度(du)、標(biao)高放(fang)樣：若基(ji)層(ceng)(ceng)(ceng)過高，則應(ying)(ying)鏟(chan)削(xue)基(ji)層(ceng)(ceng)(ceng)；若基(ji)層(ceng)(ceng)(ceng)低，模(mo)板(ban)(ban)底面(mian)(mian)(mian)與(yu)基(ji)層(ceng)(ceng)(ceng)面(mian)(mian)(mian)間有空隙，則應(ying)(ying)用(yong)原基(ji)層(ceng)(ceng)(ceng)材(cai)料(liao)(liao)(liao)(liao)的(de)細料(liao)(liao)(liao)(liao)墊實，使模(mo)板(ban)(ban)頂面(mian)(mian)(mian)標(biao)高符合C20混凝(ning)土(tu)基(ji)礎設計(ji)標(biao)高，并用(yong)模(mo)板(ban)(ban)支撐（斜撐條）固定(ding)。模(mo)板(ban)(ban)底面(mian)(mian)(mian)與(yu)基(ji)層(ceng)(ceng)(ceng)接觸處的(de)接縫(feng)，應(ying)(ying)模(mo)板(ban)(ban)外側沿縫(feng)隙處緊貼模(mo)板(ban)(ban)修筑防漏三角坡（一般以用(yong)基(ji)層(ceng)(ceng)(ceng)材(cai)料(liao)(liao)(liao)(liao)中的(de)細料(liao)(liao)(liao)(liao)為(wei)宜，舊料(liao)(liao)(liao)(liao)或析料(liao)(liao)(liao)(liao)均可采(cai)用(yong)）。

③混(hun)凝土拌(ban)各：采用(yong)現專長(chang)攪拌(ban)砼，拌(ban)制(zhi)混(hun)凝土時，要準確(que)掌握

配(pei)合(he)比(bi)，必須(xu)保證混凝土(tu)配(pei)量的(de)精確(que)度(du)。嚴格控制用水(shui)量，每天應對砂、石材料的(de)含(han)水(shui)量進(jin)行三(san)次測定（即早晨(chen)上工期、上午11時和下午16時），雨(yu)后應及時進(jin)行復測，由試(shi)驗人(ren)員(yuan)根據測定結(jie)果在用水(shui)量中加(jia)以調整，其他人(ren)員(yuan)不得任意增減。若使(shi)用攪拌(ban)機(ji)自動加(jia)水(shui)設(she)備，每班開拌(ban)前必須(xu)認真校驗其準(zhun)確(que)性(xing)。

使(shi)用(yong)袋裝水(shui)泥(ni)，應抽(chou)查袋裝水(shui)泥(ni)的(de)重(zhong)(zhong)(zhong)量(liang)，確(que)保(bao)水(shui)泥(ni)用(yong)量(liang)的(de)精確(que)度。所有材(cai)(cai)料一律(lv)按重(zhong)(zhong)(zhong)量(liang)比(bi)計(ji)。所用(yong)材(cai)(cai)料，均需(xu)用(yong)磅(bang)秤(cheng)過(guo)磅(bang)，每(mei)班開拌前磅(bang)秤(cheng)必須(xu)校(xiao)驗。混凝土配(pei)料允(yun)許誤差(cha)（自(zi)重(zhong)(zhong)(zhong)的(de)百分比(bi)）：水(shui)泥(ni)為(wei)(wei)±1%，砂為(wei)(wei)±2%，碎(sui)石(shi)為(wei)(wei)±3%，水(shui)為(wei)(wei)±1%，外摻劑為(wei)(wei)±1%。須(xu)經常(chang)清除底盤上各側(ce)邊(bian)的(de)散(san)料，以保(bao)持稱量(liang)的(de)準確(que)。

混凝(ning)土(tu)(tu)攪(jiao)拌(ban)(ban)(ban)必(bi)須(xu)做(zuo)好(hao)記錄工作，應(ying)有(you)專人負責檢查控(kong)制，每班(ban)至少檢查二次材料配量的(de)正確性(xing)和混凝(ning)土(tu)(tu)的(de)坍落度。混凝(ning)土(tu)(tu)的(de)拌(ban)(ban)(ban)和程序，加入(ru)砂(sha)—水泥—小碎(sui)(sui)(sui)石(shi)—大碎(sui)(sui)(sui)石(shi)，待(dai)全(quan)部材料倒入(ru)拌(ban)(ban)(ban)和鼓筒(tong)后，加入(ru)所需用水量，進行拌(ban)(ban)(ban)和。攪(jiao)拌(ban)(ban)(ban)時音，以混合(he)料開(kai)始出料止。混凝(ning)土(tu)(tu)攪(jiao)拌(ban)(ban)(ban)應(ying)以脹(zhang)縫間(jian)距為單位連續會(hui)進行，對不同(tong)(tong)品(pin)種、不同(tong)(tong)廠家、不同(tong)(tong)出廠日期的(de)水泥必(bi)須(xu)分別使(shi)用，嚴(yan)(yan)禁(jin)混合(he)攪(jiao)拌(ban)(ban)(ban)或混合(he)使(shi)用在(zai)同(tong)(tong)一(yi)倉內。攪(jiao)拌(ban)(ban)(ban)機(ji)拌(ban)(ban)(ban)筒(tong)轉(zhuan)(zhuan)速(su)必(bi)須(xu)符(fu)合(he)規定，嚴(yan)(yan)禁(jin)任意改(gai)變，每班(ban)結(jie)束(shu)或停(ting)止攪(jiao)拌(ban)(ban)(ban)后，攪(jiao)拌(ban)(ban)(ban)機(ji)筒(tong)內應(ying)加入(ru)水各碎(sui)(sui)(sui)石(shi)，轉(zhuan)(zhuan)動清洗干凈，并進行保養。攪(jiao)拌(ban)(ban)(ban)最長(chang)時間(jian)不超過最短時間(jian)的(de)3倍。

④混(hun)(hun)(hun)凝(ning)(ning)土(tu)的運(yun)(yun)(yun)輸(shu)：采用自卸小車運(yun)(yun)(yun)輸(shu)。轉載不應過(guo)滿，以(yi)防漏降或外溢。混(hun)(hun)(hun)凝(ning)(ning)土(tu)運(yun)(yun)(yun)輸(shu)時應推車平穩，以(yi)免車輛顛動而(er)產生離(li)析(xi)現象。若(ruo)有離(li)析(xi)，應翻(fan)拌(ban)后方可使用。混(hun)(hun)(hun)凝(ning)(ning)土(tu)混(hun)(hun)(hun)合料必須(xu)在初凝(ning)(ning)前運(yun)(yun)(yun)至攤(tan)鋪地(di)點，并有足夠(gou)的攤(tan)鋪、振實、整平和(he)抹(mo)面(mian)的時間。混(hun)(hun)(hun)凝(ning)(ning)土(tu)混(hun)(hun)(hun)合料的卸料的高度(du)不得(de)大于(yu)1.50m，以(yi)免發生離(li)析(xi)。混(hun)(hun)(hun)凝(ning)(ning)土(tu)混(hun)(hun)(hun)合料由攪拌(ban)站運(yun)(yun)(yun)到(dao)工地(di)后，應及時檢查坍落度(du)和(he)質量，若(ruo)發現問題，應及時與攪拌(ban)站聯系。

⑤混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)攤(tan)鋪(pu)(pu)：攤(tan)鋪(pu)(pu)時(shi)用鐵鏟撒(sa)鋪(pu)(pu)混(hun)(hun)(hun)(hun)(hun)合(he)料，不得(de)揚撒(sa)拋擲，以(yi)免混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)離析。在(zai)(zai)(zai)模板(ban)附近，需(xu)用方鏟扣鏟法撒(sa)鋪(pu)(pu)混(hun)(hun)(hun)(hun)(hun)合(he)料，并插搗幾下，使漿(jiang)水(shui)搗出，以(yi)免發生空洞蜂窩現象。每(mei)倉(cang)混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)的(de)(de)攤(tan)鋪(pu)(pu)振(zhen)實工(gong)作(zuo)(zuo)應(ying)(ying)(ying)連續(xu)(xu)進行，不得(de)中(zhong)途(tu)間(jian)(jian)斷。若有特殊(shu)的(de)(de)原(yuan)因(yin)，在(zai)(zai)(zai)初凝(ning)(ning)(ning)時(shi)間(jian)(jian)內被近臨時(shi)停(ting)工(gong)，中(zhong)斷施(shi)工(gong)的(de)(de)一(yi)塊混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)上應(ying)(ying)(ying)用濕麻布覆蓋，以(yi)防假凝(ning)(ning)(ning)。恢復施(shi)工(gong)時(shi)，應(ying)(ying)(ying)將此處混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)耜松補漿(jiang)后再(zai)繼續(xu)(xu)澆注。若停(ting)工(gong)超(chao)過(guo)混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)初凝(ning)(ning)(ning)時(shi)間(jian)(jian)，應(ying)(ying)(ying)作(zuo)(zuo)施(shi)工(gong)縫處理(li)。施(shi)工(gong)縫應(ying)(ying)(ying)設在(zai)(zai)(zai)縮縫處。若無(wu)法設在(zai)(zai)(zai)縮縫處，其(qi)位置應(ying)(ying)(ying)設在(zai)(zai)(zai)板(ban)的(de)(de)正中(zhong)部分。超(chao)過(guo)初凝(ning)(ning)(ning)時(shi)間(jian)(jian)的(de)(de)混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)混(hun)(hun)(hun)(hun)(hun)合(he)料嚴禁繼續(xu)(xu)使用，嚴禁分散鋪(pu)(pu)于混(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)板(ban)底(di)層，已經攤(tan)鋪(pu)(pu)的(de)(de)必須予以(yi)清除。

澆(jiao)筑(zhu)過程中如遇雨(yu)，應在(zai)事前(qian)準(zhun)備好的(de)防雨(yu)棚內進(jin)行攤鋪、振實和(he)抹面(mian)工作。攤鋪前(qian)，縱向企口(kou)縫應全面(mian)均勻涂刷(shua)兩(liang)度(du)油—60瀝青，其厚度(du)約為2mm。涂刷(shua)工作在(zai)拆模后(hou)(hou)縱縫表面(mian)有泥砂不刷(shua)，刷(shua)后(hou)(hou)還應

逐(zhu)段檢查。每(mei)300m3混(hun)凝土(tu)應制作一組(zu)試塊，但每(mei)班(ban)應至少制作一組(zu)，每(mei)組(zu)六個試塊（三個抗折、三個抗壓(ya)），作為混(hun)凝土(tu)28d強度(du)的依(yi)據。若需要作7d和(he)14d試驗(yan)，另(ling)行增(zeng)加試塊組(zu)數(shu)。度(du)塊必須現場制作，并(bing)與混(hun)凝土(tu)面層在(zai)同(tong)等的條件下濕治(zhi)養生。

⑥混(hun)凝(ning)土(tu)(tu)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)實：混(hun)凝(ning)土(tu)(tu)鋪筑到(dao)厚度一(yi)半后，先采用(yong)2.2（3.0KW）的(de)(de)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)(ban)式振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)一(yi)遍，然后加高(gao)鋪筑混(hun)凝(ning)土(tu)(tu)到(dao)頂，等(deng)初(chu)步整(zheng)(zheng)平(ping)(ping)(ping)后換用(yong)1.2KW～1.5KW的(de)(de)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)(ban)式振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)再振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)一(yi)遍。振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)時，振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)器(qi)(qi)沿縱向一(yi)行一(yi)行地由邊向中移動(dong)(dong)(dong)，每(mei)(mei)次移動(dong)(dong)(dong)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)(ban)時前(qian)后位置的(de)(de)搭(da)頭重(zhong)疊(die)面為(wei)(wei)(wei)(wei)20cm左右(you)（約為(wei)(wei)(wei)(wei)1/3平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)(ban)寬(kuan)度）。不(bu)(bu)得漏(lou)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)。振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)在(zai)(zai)每(mei)(mei)一(yi)位置的(de)(de)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)時間一(yi)般為(wei)(wei)(wei)(wei)20s～25s，不(bu)(bu)得過久，應(ying)(ying)以(yi)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)至混(hun)凝(ning)土(tu)(tu)混(hun)合料乏漿，不(bu)(bu)明(ming)顯下(xia)降、不(bu)(bu)冒氣泡，表(biao)面均(jun)(jun)勻為(wei)(wei)(wei)(wei)度。凡振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)不(bu)(bu)到(dao)的(de)(de)地方，如模板(ban)(ban)(ban)(ban)(ban)邊緣、傳(chuan)力(li)桿和(he)企(qi)口處、窨井及(ji)進水口附近等(deng)，均(jun)(jun)改(gai)用(yong)高(gao)頻率插(cha)(cha)入式振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)，振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)時應(ying)(ying)將振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)棒垂(chui)直上下(xia)緩慢插(cha)(cha)動(dong)(dong)(dong)，每(mei)(mei)次移動(dong)(dong)(dong)間距不(bu)(bu)得大于作用(yong)半徑的(de)(de)1.5倍。插(cha)(cha)入式振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)與模板(ban)(ban)(ban)(ban)(ban)的(de)(de)間距一(yi)般為(wei)(wei)(wei)(wei)10cm左右(you)。插(cha)(cha)入式振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)嚴(yan)禁在(zai)(zai)傳(chuan)力(li)桿上振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)，以(yi)免損壞鄰(lin)板(ban)(ban)(ban)(ban)(ban)邊緣混(hun)凝(ning)土(tu)(tu)。經(jing)(jing)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)(ban)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)器(qi)(qi)整(zheng)(zheng)平(ping)(ping)(ping)后的(de)(de)混(hun)凝(ning)土(tu)(tu)表(biao)面，應(ying)(ying)基(ji)本(ben)平(ping)(ping)(ping)整(zheng)(zheng)，無明(ming)顯的(de)(de)凹凸痕跡。然后用(yong)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)夯樣(yang)板(ban)(ban)(ban)(ban)(ban)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)實整(zheng)(zheng)平(ping)(ping)(ping)。振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)夯樣(yang)板(ban)(ban)(ban)(ban)(ban)在(zai)(zai)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)搗(dao)時其兩(liang)(liang)(liang)端應(ying)(ying)擱(ge)在(zai)(zai)兩(liang)(liang)(liang)側縱向模板(ban)(ban)(ban)(ban)(ban)上，或擱(ge)在(zai)(zai)已澆好(hao)的(de)(de)兩(liang)(liang)(liang)側水泥板(ban)(ban)(ban)(ban)(ban)上，作為(wei)(wei)(wei)(wei)控(kong)制路(lu)面標高(gao)的(de)(de)依據(ju)。為(wei)(wei)(wei)(wei)是提高(gao)混(hun)凝(ning)土(tu)(tu)面層表(biao)面的(de)(de)平(ping)(ping)(ping)整(zheng)(zheng)度、密實度各耐磨能(neng)力(li)，經(jing)(jing)振(zhen)(zhen)(zhen)(zhen)(zhen)(zhen)實

整平后，應(ying)用振動夯(hang)樣板(ban)(ban)擱在(zai)縱向模板(ban)(ban)（側模）頂上，自一端向另一端依次振動兩遍。

⑦收水抹面：第(di)一(yi)(yi)遍必(bi)須在平(ping)整完畢的(de)15min（根據氣候掌(zhang)握）后進行。其目的(de)主要是驅(qu)除泌水和壓下石子；第(di)一(yi)(yi)次初步抹平(ping)可先用(yong)(yong)長(chang)(chang)45cm,寬20cm，厚2.5cm的(de)長(chang)(chang)柄(bing)木抹上(shang)面裝有3.5cm長(chang)(chang)的(de)竹竿，另一(yi)(yi)端離地高度(du)為1m。使用(yong)(yong)時將大木盒在混凝土表面進行來(lai)(lai)回抹平(ping)，操(cao)作人員(yuan)站在水泥(ni)的(de)側邊上(shang)操(cao)作，順(shun)橫(heng)坡方向拖(tuo)抹一(yi)(yi)遍，來(lai)(lai)回抹面重(zhong)疊(die)1/2。

待水分稍蒸發后，約過(guo)10min～15min，第二次(ci)抹(mo)(mo)面(mian)(mian)可(ke)用大鐵抹(mo)(mo)拖(tuo)(tuo)抹(mo)(mo)。大鐵抹(mo)(mo)長、寬尺寸同(tong)木(mu)抹(mo)(mo)，厚度采(cai)用2mm～4mm鋼(gang)板制成，并須知成兩邊比(bi)中間低2mm的(de)(de)坡度，使鐵抹(mo)(mo)面(mian)(mian)的(de)(de)砼面(mian)(mian)上(shang)來(lai)回拖(tuo)(tuo)抹(mo)(mo)時(shi)，不致為(wei)混凝(ning)土面(mian)(mian)所吸住。拖(tuo)(tuo)抹(mo)(mo)的(de)(de)方向與要求(qiu)同(tong)木(mu)抹(mo)(mo)，該種工具在表面(mian)(mian)拖(tuo)(tuo)抹(mo)(mo)時(shi)，不必(bi)向下(xia)加壓(ya)。

用泥(ni)板(ban)(ban)(ban)（其長(chang)寬尺寸分別為(wei)26cm，厚度為(wei)1mm的鋼(gang)板(ban)(ban)(ban)）仔細(xi)抹(mo)光(guang)。同一個面(mian)層至少用泥(ni)板(ban)(ban)(ban)抹(mo)四遍(bian)。第二，第三遍(bian)吸(xi)水抹(mo)面(mian)繼續驅除泌水外，并應(ying)進(jin)行整平抹(mo)光(guang)工(gong)作。操作時(shi)，每一遍(bian)抹(mo)面(mian)泥(ni)板(ban)(ban)(ban)與路面(mian)的交角(jiao)(jiao)應(ying)為(wei)50，以后(hou)各遍(bian)由于(yu)表面(mian)層的水分逐漸(jian)蒸(zheng)發和減少，因此每遍(bian)以50的角(jiao)(jiao)度增(zeng)加，即(ji)第二遍(bian)抹(mo)面(mian)時(shi)交角(jiao)(jiao)為(wei)100，以此類推。抹(mo)面(mian)時(shi)手(shou)腕動作要(yao)靈活，用力須均勻，泥(ni)板(ban)(ban)(ban)來回抹(mo)面(mian)重疊(die)應(ying)為(wei)泥(ni)板(ban)(ban)(ban)長(chang)度的

1/3～1/2。站在(zai)工(gong)作(zuo)橋(qiao)(qiao)上(shang)進行操(cao)作(zuo)，工(gong)作(zuo)橋(qiao)(qiao)可(ke)用厚5cm～7.5cm、寬15cm～20cm，其兩(liang)沿(yan)下部釘有10cm高的方(fang)木(mu)。操(cao)作(zuo)時將工(gong)作(zuo)橋(qiao)(qiao)的方(fang)木(mu)擱(ge)在(zai)兩(liang)邊的縱向模板上(shang)，或放在(zai)已澆筑好的鄰板上(shang)。工(gong)作(zuo)橋(qiao)(qiao)可(ke)隨(sui)工(gong)作(zuo)需要搬(ban)移，嚴禁操(cao)作(zuo)人員直接站在(zai)混(hun)凝土面層(ceng)上(shang)工(gong)作(zuo)。

當混凝土處于凝終止狀態，表(biao)面(mian)尚(shang)呈濕潤時，應趁(chen)此時機(ji)進(jin)行第四遍(bian)最后(hou)一次抹面(mian)，把混凝土表(biao)面(mian)砂漿進(jin)一步擠壓(ya)緊密。表(biao)面(mian)平整后(hou)，多余不基本排(pai)除蒸發，那時用食指稍微加壓(ya)按下去能(neng)出現(xian)(xian)2mm左右(you)深度的凹痕，或泥板加壓(ya)抹面(mian)能(neng)出現(xian)(xian)水光(guang)。

⑧伸縮縫(feng)施工：在混凝(ning)(ning)(ning)土(tu)澆搗(dao)完畢(bi)后，經過養生混凝(ning)(ning)(ning)土(tu)強(qiang)度(du)(du)達到20%～30%設計強(qiang)度(du)(du)時(shi)既可切(qie)(qie)割(ge)(ge)。按照縮縫(feng)或縱縫(feng)的(de)位置(zhi)使用切(qie)(qie)縫(feng)機(ji)切(qie)(qie)割(ge)(ge)成(cheng)縫(feng)，其寬(kuan)度(du)(du)約在6～8mm。切(qie)(qie)縫(feng)時(shi)必須(xu)掌握切(qie)(qie)縫(feng)時(shi)間，防止因溫差影響使混凝(ning)(ning)(ning)土(tu)早期(qi)出現裂縫(feng)。混凝(ning)(ning)(ning)土(tu)要采用32.5級的(de)普通水泥(ni)，混凝(ning)(ning)(ning)土(tu)強(qiang)度(du)(du)增長較(jiao)快，能適(shi)應切(qie)(qie)割(ge)(ge)時(shi)間。經驗表(biao)明，適(shi)宜(yi)切(qie)(qie)縫(feng)強(qiang)度(du)(du)為8Mpa～12Mpa效果較(jiao)好(hao)。