土工膜鋪設前,需要依據現場情況鋪設土工布,將土(tu)(tu)工布(bu)(bu)裁剪成合(he)適(shi)的(de)(de)尺寸(cun)規(gui)格,并檢查其(qi)搭(da)(da)接寬度(du)(du),最小搭(da)(da)接寬度(du)(du)100mm坡(po)度(du)(du)10%以(yi)下,厚(hou)度(du)(du)在300g/m2以(yi)上的(de)(de)熱(re)熔焊接處理(li),搭(da)(da)接區域保持(chi)平整狀態(tai)。在鋪(pu)設土(tu)(tu)工布(bu)(bu)時,先錨固,再(zai)鋪(pu)放;使(shi)用(yong)(yong)熱(re)風槍將鄰近土(tu)(tu)工布(bu)(bu)搭(da)(da)接黏(nian)結;裸(luo)露在外的(de)(de)土(tu)(tu)工布(bu)(bu)邊緣,使(shi)用(yong)(yong)重物壓上,避(bi)免土(tu)(tu)工布(bu)(bu)被吹起。現場監理(li)人員要仔細(xi)檢查土(tu)(tu)工布(bu)(bu)是否存(cun)在缺陷,有(you)缺陷要標注清楚,多采用(yong)(yong)補片方式修(xiu)補,緩(huan)坡(po)坡(po)度(du)(du)≤10%的(de)(de),采用(yong)(yong)材質相同的(de)(de)土(tu)(tu)工布(bu)(bu)按照搭(da)(da)接寬度(du)(du)60mm補片進行熱(re)熔焊接處理(li)。
本工(gong)(gong)(gong)程選擇高密度(du)(du)聚乙烯(highdensitypolyethylene,HDPE)土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)鋪(pu)(pu)設(she),鋪(pu)(pu)設(she)前(qian)仔細(xi)檢查相(xiang)關合(he)(he)(he)格證明;裁剪土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)前(qian),根據(ju)現(xian)場情況確(que)定(ding)具體尺寸(cun)規格,應(ying)逐(zhu)片編號(hao),并(bing)做好記錄;HDPE土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)鋪(pu)(pu)設(she)時(shi),盡可能(neng)(neng)(neng)減(jian)少(shao)焊(han)(han)(han)(han)(han)(han)縫(feng)(feng)數量(liang),保證土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)質(zhi)(zhi)量(liang),減(jian)少(shao)不(bu)必要(yao)(yao)(yao)的材料;嚴格控制土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)接(jie)(jie)(jie)(jie)(jie)縫(feng)(feng)搭(da)(da)接(jie)(jie)(jie)(jie)(jie)寬度(du)(du),通常在(zai)10cm以(yi)上(shang),焊(han)(han)(han)(han)(han)(han)縫(feng)(feng)與最大坡(po)度(du)(du)平行排列;畸形和(he)(he)拐角區域,盡可能(neng)(neng)(neng)縮短接(jie)(jie)(jie)(jie)(jie)縫(feng)(feng)長(chang)度(du)(du),坡(po)度(du)(du)1:6以(yi)上(shang)的斜坡(po)范圍內,則盡可能(neng)(neng)(neng)避(bi)(bi)免(mian)(mian)設(she)置焊(han)(han)(han)(han)(han)(han)縫(feng)(feng);土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)鋪(pu)(pu)設(she)期間,要(yao)(yao)(yao)避(bi)(bi)免(mian)(mian)人為操(cao)作(zuo)失誤出現(xian)褶皺(zhou),如(ru)果氣(qi)候(hou)溫度(du)(du)較低(di),則要(yao)(yao)(yao)盡可能(neng)(neng)(neng)拉緊土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo),鋪(pu)(pu)設(she)平整。鋪(pu)(pu)設(she)HDPE土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)后,施工(gong)(gong)(gong)人員要(yao)(yao)(yao)盡可能(neng)(neng)(neng)避(bi)(bi)免(mian)(mian)在(zai)土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)上(shang)行走或搬運材料,避(bi)(bi)免(mian)(mian)重(zhong)型(xing)材料堆放在(zai)土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)上(shang),避(bi)(bi)免(mian)(mian)損害土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo),保證土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)鋪(pu)(pu)設(she)質(zhi)(zhi)量(liang)。HDPE土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie),通常焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)方法包括熱氣(qi)焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)和(he)(he)電熱焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)。焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)前(qian),必須確(que)保接(jie)(jie)(jie)(jie)(jie)縫(feng)(feng)區域干燥(zao),沒(mei)有污物或雜物。然后使用適當的焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)設(she)備,將土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)邊緣重(zhong)疊并(bing)進行熔合(he)(he)(he)。焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)前(qian)需(xu)(xu)要(yao)(yao)(yao)現(xian)場試焊(han)(han)(han)(han)(han)(han),試樣(yang)尺寸(cun)0.9mm×0.3mm,搭(da)(da)接(jie)(jie)(jie)(jie)(jie)寬度(du)(du)10cm以(yi)上(shang),并(bing)進行剝離與剪切試樣(yang),符合(he)(he)(he)要(yao)(yao)(yao)求后調整壓力、速度(du)(du)和(he)(he)溫度(du)(du)等指標,然后正式焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)。焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)的溫度(du)(du)和(he)(he)時(shi)間必須根據(ju)土(tu)(tu)(tu)工(gong)(gong)(gong)膜(mo)(mo)(mo)材料的類(lei)型(xing)和(he)(he)厚度(du)(du)合(he)(he)(he)理調整,以(yi)確(que)保焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)質(zhi)(zhi)量(liang)。如(ru)果土(tu)(tu)(tu)工(gong)(gong)(gong)模(mo)長(chang)度(du)(du)不(bu)足(zu),則需(xu)(xu)要(yao)(yao)(yao)長(chang)向(xiang)(xiang)拼接(jie)(jie)(jie)(jie)(jie),先橫向(xiang)(xiang)焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie)焊(han)(han)(han)(han)(han)(han)縫(feng)(feng),再縱(zong)縫(feng)(feng)焊(han)(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)(jie),同(tong)時(shi)要(yao)(yao)(yao)保證橫向(xiang)(xiang)焊(han)(han)(han)(han)(han)(han)縫(feng)(feng)間距避(bi)(bi)免(mian)(mian)十字交叉,以(yi)T字形布設(she)。