中山鋼(gang)(gang)(gang)套(tao)鋼(gang)(gang)(gang)蒸(zheng)(zheng)汽直(zhi)埋(mai)保(bao)(bao)(bao)(bao)溫(wen)管(guan)(guan)(guan)由于(yu)(yu)外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)層(ceng)(ceng)(ceng)(ceng)為(wei)(wei)鋼(gang)(gang)(gang)管(guan)(guan)(guan)，因(yin)(yin)(yin)而對(dui)于(yu)(yu)工作(zuo)內(nei)管(guan)(guan)(guan)在(zai)(zai)運(yun)行當中出(chu)(chu)現泄漏的(de)(de)(de)(de)(de)(de)(de)事故能(neng)起到一定(ding)(ding)的(de)(de)(de)(de)(de)(de)(de)延緩破(po)壞的(de)(de)(de)(de)(de)(de)(de)作(zuo)用(yong)(yong)，防止蒸(zheng)(zheng)汽溢出(chu)(chu)傷人。鋼(gang)(gang)(gang)外(wai)(wai)(wai)(wai)(wai)護(hu)管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)防腐一般采(cai)(cai)用(yong)(yong)兩布三油、層(ceng)(ceng)(ceng)(ceng)PE、玻(bo)(bo)璃(li)(li)(li)鋼(gang)(gang)(gang)纏繞、聚(ju)(ju)(ju)脲噴涂以(yi)及環氧粉末噴涂等多(duo)種形(xing)(xing)式(shi)無(wu)機保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)4、聚(ju)(ju)(ju)氨酯(zhi)(zhi)保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)5、外(wai)(wai)(wai)(wai)(wai)護(hu)管(guan)(guan)(guan)（高密度(du)聚(ju)(ju)(ju)乙烯、玻(bo)(bo)璃(li)(li)(li)鋼(gang)(gang)(gang)或(huo)經(jing)過(guo)防腐處(chu)理的(de)(de)(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)管(guan)(guan)(guan)） 中山鋼(gang)(gang)(gang)套(tao)鋼(gang)(gang)(gang)蒸(zheng)(zheng)汽保(bao)(bao)(bao)(bao)溫(wen)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)(de)固(gu)(gu)(gu)定(ding)(ding)形(xing)(xing)式(shi)蒸(zheng)(zheng)汽直(zhi)埋(mai)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)(de)固(gu)(gu)(gu)定(ding)(ding)形(xing)(xing)式(shi)有(you)兩種即(ji)(ji)內(nei)固(gu)(gu)(gu)定(ding)(ding)形(xing)(xing)式(shi)和(he)外(wai)(wai)(wai)(wai)(wai)固(gu)(gu)(gu)定(ding)(ding)形(xing)(xing)式(shi)，外(wai)(wai)(wai)(wai)(wai)固(gu)(gu)(gu)定(ding)(ding)即(ji)(ji)工作(zuo)芯(xin)管(guan)(guan)(guan)和(he)外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)管(guan)(guan)(guan)同時固(gu)(gu)(gu)定(ding)(ding)，在(zai)(zai)每一段(duan)管(guan)(guan)(guan)道(dao)和(he)補(bu)償器(qi)的(de)(de)(de)(de)(de)(de)(de)兩端，都要設兩個很(hen)大(da)的(de)(de)(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)筋(jin)混(hun)凝土支(zhi)墩(dun)(dun)，才(cai)(cai)能(neng)保(bao)(bao)(bao)(bao)證管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)(de)固(gu)(gu)(gu)定(ding)(ding)。"塑(su)套(tao)鋼(gang)(gang)(gang)"和(he)"玻(bo)(bo)璃(li)(li)(li)鋼(gang)(gang)(gang)套(tao)鋼(gang)(gang)(gang)"保(bao)(bao)(bao)(bao)溫(wen)結構(gou)(gou)(gou)必須采(cai)(cai)取這種固(gu)(gu)(gu)定(ding)(ding)形(xing)(xing)式(shi)。內(nei)固(gu)(gu)(gu)定(ding)(ding)即(ji)(ji)內(nei)外(wai)(wai)(wai)(wai)(wai)管(guan)(guan)(guan)間的(de)(de)(de)(de)(de)(de)(de)固(gu)(gu)(gu)定(ding)(ding)，內(nei)管(guan)(guan)(guan)通過(guo)一定(ding)(ding)的(de)(de)(de)(de)(de)(de)(de)結構(gou)(gou)(gou)形(xing)(xing)式(shi)固(gu)(gu)(gu)定(ding)(ding)在(zai)(zai)外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)管(guan)(guan)(guan)上，充分利(li)用(yong)(yong)外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)強度(du)和(he)剛度(du)以(yi)及外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)管(guan)(guan)(guan)與(yu)土壤之(zhi)間的(de)(de)(de)(de)(de)(de)(de)磨擦力來使內(nei)管(guan)(guan)(guan)固(gu)(gu)(gu)定(ding)(ding)，可(ke)節省鋼(gang)(gang)(gang)筋(jin)混(hun)凝土支(zhi)墩(dun)(dun)。只有(you)以(yi)鋼(gang)(gang)(gang)管(guan)(guan)(guan)作(zuo)為(wei)(wei)外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)管(guan)(guan)(guan)才(cai)(cai)可(ke)能(neng)采(cai)(cai)用(yong)(yong)內(nei)固(gu)(gu)(gu)定(ding)(ding)形(xing)(xing)式(shi)。外(wai)(wai)(wai)(wai)(wai)固(gu)(gu)(gu)定(ding)(ding)因(yin)(yin)(yin)為(wei)(wei)必須設鋼(gang)(gang)(gang)筋(jin)混(hun)凝土支(zhi)墩(dun)(dun)所以(yi)施工占地大(da)、投(tou)資多(duo)，工期長(chang)而且(qie)支(zhi)墩(dun)(dun)是(shi)(shi)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)(de)薄弱部位(wei)，該部位(wei)易產(chan)(chan)(chan)生"熱(re)(re)橋"，也(ye)(ye)易出(chu)(chu)現滲水(shui)現象，管(guan)(guan)(guan)道(dao)運(yun)行不正(zheng)常時，該部位(wei)也(ye)(ye)易出(chu)(chu)現事故。特(te)別是(shi)(shi)對(dui)"鋼(gang)(gang)(gang)套(tao)鋼(gang)(gang)(gang)"保(bao)(bao)(bao)(bao)溫(wen)結構(gou)(gou)(gou)，由于(yu)(yu)溫(wen)升(sheng)引起的(de)(de)(de)(de)(de)(de)(de)外(wai)(wai)(wai)(wai)(wai)鋼(gang)(gang)(gang)管(guan)(guan)(guan)熱(re)(re)應力特(te)別大(da)，鋼(gang)(gang)(gang)筋(jin)混(hun)凝土支(zhi)墩(dun)(dun)的(de)(de)(de)(de)(de)(de)(de)尺寸也(ye)(ye)特(te)別大(da)，該部位(wei)也(ye)(ye)更易出(chu)(chu)現事故。對(dui)"鋼(gang)(gang)(gang)套(tao)鋼(gang)(gang)(gang)"保(bao)(bao)(bao)(bao)溫(wen)結構(gou)(gou)(gou)，采(cai)(cai)用(yong)(yong)內(nei)固(gu)(gu)(gu)定(ding)(ding)結構(gou)(gou)(gou)具有(you)很(hen)大(da)的(de)(de)(de)(de)(de)(de)(de)優越性蒸(zheng)(zheng)汽直(zhi)埋(mai)管(guan)(guan)(guan)道(dao)由于(yu)(yu)輸送的(de)(de)(de)(de)(de)(de)(de)介質(zhi)溫(wen)度(du)很(hen)高，一般超過(guo)200℃，所以(yi)不能(neng)象直(zhi)埋(mai)熱(re)(re)水(shui)管(guan)(guan)(guan)那(nei)樣采(cai)(cai)用(yong)(yong)聚(ju)(ju)(ju)氨酯(zhi)(zhi)作(zuo)為(wei)(wei)的(de)(de)(de)(de)(de)(de)(de)保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)（因(yin)(yin)(yin)為(wei)(wei)聚(ju)(ju)(ju)氨酯(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)碳化溫(wen)度(du)在(zai)(zai)142度(du)左右）。因(yin)(yin)(yin)而不少廠家的(de)(de)(de)(de)(de)(de)(de)蒸(zheng)(zheng)汽直(zhi)埋(mai)管(guan)(guan)(guan)道(dao)采(cai)(cai)用(yong)(yong)了復(fu)合(he)保(bao)(bao)(bao)(bao)溫(wen)的(de)(de)(de)(de)(de)(de)(de)結構(gou)(gou)(gou)，而復(fu)合(he)保(bao)(bao)(bao)(bao)溫(wen)的(de)(de)(de)(de)(de)(de)(de)結構(gou)(gou)(gou)又可(ke)大(da)致(zhi)分為(wei)(wei)"塑(su)套(tao)鋼(gang)(gang)(gang)"和(he)"鋼(gang)(gang)(gang)套(tao)鋼(gang)(gang)(gang)"兩種結1、"塑(su)（玻(bo)(bo)璃(li)(li)(li)鋼(gang)(gang)(gang)）套(tao)鋼(gang)(gang)(gang)"結構(gou)(gou)(gou)：從里到外(wai)(wai)(wai)(wai)(wai)依次為(wei)(wei)工作(zuo)芯(xin)管(guan)(guan)(guan)、潤滑(hua)層(ceng)(ceng)(ceng)(ceng)、復(fu)合(he)保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)、高密度(du)聚(ju)(ju)(ju)乙烯（或(huo)玻(bo)(bo)璃(li)(li)(li)鋼(gang)(gang)(gang)）外(wai)(wai)(wai)(wai)(wai)保(bao)(bao)(bao)(bao)護(hu)層(ceng)(ceng)(ceng)(ceng)。其(qi)中潤滑(hua)層(ceng)(ceng)(ceng)(ceng)的(de)(de)(de)(de)(de)(de)(de)作(zuo)用(yong)(yong)是(shi)(shi)使工作(zuo)芯(xin)管(guan)(guan)(guan)與(yu)隔熱(re)(re)層(ceng)(ceng)(ceng)(ceng)之(zhi)間能(neng)產(chan)(chan)(chan)生相對(dui)滑(hua)動(dong)，避(bi)免因(yin)(yin)(yin)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)(de)工作(zuo)芯(xin)管(guan)(guan)(guan)和(he)與(yu)其(qi)接(jie)觸的(de)(de)(de)(de)(de)(de)(de)無(wu)機保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)因(yin)(yin)(yin)熱(re)(re)膨脹系(xi)數(shu)不同而產(chan)(chan)(chan)生相互牽拉的(de)(de)(de)(de)(de)(de)(de)破(po)壞作(zuo)用(yong)(yong)。潤滑(hua)層(ceng)(ceng)(ceng)(ceng)材料一般為(wei)(wei)無(wu)機潤滑(hua)劑或(huo)無(wu)機減阻(zu)層(ceng)(ceng)(ceng)(ceng)，復(fu)合(he)保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)從內(nei)到外(wai)(wai)(wai)(wai)(wai)一般為(wei)(wei)無(wu)機憎水(shui)保(bao)(bao)(bao)(bao)溫(wen)材料＋聚(ju)(ju)(ju)氨酯(zhi)(zhi)泡沫保(bao)(bao)(bao)(bao)溫(wen)層(ceng)(ceng)(ceng)(ceng)。

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