土工膜焊接質量檢驗，是土工膜施工中極為關鍵的一個環節。隨著施工的進展，要求及時檢查土工膜與膜焊接質量，每道焊縫完成后，隨即進行質量檢查。對焊縫百分之百進行檢驗。其目的在于確保土工膜的施工質量。
1.目測：看兩條焊(han)縫是否平整、清晰、無(wu)皺、透明、無(wu)挾渣、起(qi)泡漏點(dian)、熔(rong)點(dian)或焊(han)縫跑邊等。
2.非(fei)破壞性檢(jian)測(ce)(ce)：A.充(chong)(chong)氣(qi)(qi)檢(jian)漏：此法僅適用于熱楔焊縫(feng)(feng)質量的檢(jian)驗。檢(jian)測(ce)(ce)儀(yi)(yi)器為充(chong)(chong)氣(qi)(qi)檢(jian)測(ce)(ce)儀(yi)(yi)。當(dang)焊接(jie)(jie)完(wan)全冷卻后，將欲測(ce)(ce)焊縫(feng)(feng)氣(qi)(qi)道(dao)兩端熱熔封(feng)堵，將充(chong)(chong)氣(qi)(qi)檢(jian)測(ce)(ce)儀(yi)(yi)的針(zhen)頭插(cha)入氣(qi)(qi)道(dao)內并(bing)充(chong)(chong)以壓(ya)(ya)縮空(kong)氣(qi)(qi)，壓(ya)(ya)縮空(kong)氣(qi)(qi)壓(ya)(ya)力0.2Mpa時充(chong)(chong)氣(qi)(qi)氣(qi)(qi)道(dao)應鼓起(qi)，但不得開裂。將充(chong)(chong)氣(qi)(qi)壓(ya)(ya)力降至0.05Mpa，并(bing)保壓(ya)(ya)5min以上，可(ke)判斷(duan)該焊縫(feng)(feng)焊接(jie)(jie)質量為合格
B.抽(chou)氣試驗(yan)：此法不僅對焊縫(feng)，而且對土(tu)(tu)工(gong)(gong)膜平面(mian)上任何疑點(dian)(dian)(dian)處(chu)均適用(yong)(yong)(yong)。抽(chou)氣試驗(yan)儀(yi)(yi)器為真空(kong)檢(jian)漏(lou)儀(yi)(yi)。真空(kong)檢(jian)漏(lou)的原理(li)很簡單，即在土(tu)(tu)工(gong)(gong)膜的焊縫(feng)處(chu)，或土(tu)(tu)工(gong)(gong)膜面(mian)上有滲漏(lou)點(dian)(dian)(dian)，將(jiang)該處(chu)先涂以肥皂水(shui)，將(jiang)真空(kong)檢(jian)漏(lou)儀(yi)(yi)蓋在其(qi)上，開啟真空(kong)泵，透(tou)(tou)明(ming)罩(zhao)(zhao)內形成負壓(ya)(ya)，漏(lou)點(dian)(dian)(dian)處(chu)將(jiang)有肥皂泡(pao)產生(sheng)，這可由透(tou)(tou)明(ming)罩(zhao)(zhao)外觀察(cha)到。若(ruo)觀察(cha)不到肥皂泡(pao)，則說明(ming)該處(chu)并無(wu)滲漏(lou)點(dian)(dian)(dian)。采(cai)用(yong)(yong)(yong)此法時(shi)，有2點(dian)(dian)(dian)需(xu)要(yao)說明(ming)：其(qi)一(yi)是透(tou)(tou)明(ming)罩(zhao)(zhao)內邊緣(yuan)產生(sheng)肥皂泡(pao)，不能說明(ming)土(tu)(tu)工(gong)(gong)膜有滲漏(lou)點(dian)(dian)(dian)。其(qi)二(er)是當透(tou)(tou)明(ming)罩(zhao)(zhao)騎在擠壓(ya)(ya)焊接(jie)的焊接(jie)縫(feng)上時(shi)，焊包處(chu)必須用(yong)(yong)(yong)泥(ni)子抹成緩慢過濾的坡，才可以保證泡(pao)沫橡膠密封(feng)的可靠(kao)性。采(cai)用(yong)(yong)(yong)真空(kong)漏(lou)檢(jian)時(shi)，一(yi)般真空(kong)度為160-533.3Mpa,須要(yao)保壓(ya)(ya)觀察(cha)時(shi)，一(yi)般壓(ya)(ya)力為200-240Mpa,保壓(ya)(ya)30s即可。
