玄(xuan)妙觀(guan)在江(jiang)蘇省蘇州市(shi),始建于西晉咸寧(ning)二(er)年(nian)(nian),唐代稱開元宮,北(bei)宋(song)稱天慶觀(guan),元代改今名,曾多(duo)(duo)次(ci)毀壞(huai),多(duo)(duo)次(ci)修葺(qi)。三清(qing)殿(dian)是(shi)玄(xuan)妙觀(guan)的(de)(de)正殿(dian),重建于南(nan)宋(song)淳熙六年(nian)(nian)(1179),是(shi)中國長(chang)江(jiang)以(yi)南(nan)大(da)的(de)(de)木構古建筑(zhu)。它(ta)既是(shi)宋(song)代官式建筑(zhu)的(de)(de)代表(biao),也表(biao)現(xian)出(chu)地方性建筑(zhu)的(de)(de)特點,是(shi)研(yan)究宋(song)代南(nan)北(bei)建筑(zhu)差異的(de)(de)重要(yao)例證。1982年(nian)(nian)定為全國重點文物保護單(dan)位。
三清殿為重(zhong)檐歇(xie)山頂建筑(見大木(mu)作),殿身面(mian)闊七間(jian),進深(shen)四(si)間(jian),四(si)周加一(yi)圈深(shen)一(yi)間(jian)的(de)(de)副階,構成下檐。殿前有寬五間(jian)的(de)(de)月臺。
殿(dian)(dian)的木構(gou)部分屬殿(dian)(dian)堂型構(gou)架(jia)(jia),近似《營造法式》所載殿(dian)(dian)身七間(jian)(jian)副階(jie)周匝身內(nei)金箱斗(dou)底槽(cao)(cao)構(gou)架(jia)(jia)。構(gou)架(jia)(jia)由上(shang)(shang)(shang)、中(zhong)、下(xia)三層(ceng)重疊(die)而(er)成(cheng)(cheng)。下(xia)層(ceng)為柱(zhu)網(wang),沿(yan)周邊(bian)立(li)兩(liang)(liang)圈(quan)(quan)柱(zhu)子,外圈(quan)(quan)22柱(zhu),內(nei)圈(quan)(quan)14柱(zhu),柱(zhu)頂(ding)架(jia)(jia)闌額,連成(cheng)(cheng)兩(liang)(liang)個相套的同(tong)高矩(ju)形(xing)框,形(xing)成(cheng)(cheng)內(nei)外槽(cao)(cao)。又(you)沿(yan)進深(shen)方(fang)向在(zai)(zai)(zai)內(nei)槽(cao)(cao)前后四(si)(si)柱(zhu)間(jian)(jian)架(jia)(jia)四(si)(si)道(dao)順串(即清式的隨梁(liang)枋(fang)),使柱(zhu)端縱橫向都連在(zai)(zai)(zai)一起(qi)。在(zai)(zai)(zai)四(si)(si)道(dao)順串的中(zhong)部,下(xia)面又(you)立(li)四(si)(si)柱(zhu),形(xing)成(cheng)(cheng)現狀的滿(man)堂柱(zhu)網(wang)。中(zhong)層(ceng)是鋪(pu)(pu)(pu)作(zuo)(zuo)(zuo)層(ceng),在(zai)(zai)(zai)闌額和(he)順串上(shang)(shang)(shang)加普拍枋(fang),枋(fang)上(shang)(shang)(shang)放斗(dou),柱(zhu)間(jian)(jian)用兩(liang)(liang)朵補間(jian)(jian)鋪(pu)(pu)(pu)作(zuo)(zuo)(zuo),前后內(nei)柱(zhu)間(jian)(jian)順串上(shang)(shang)(shang)用三朵補間(jian)(jian)鋪(pu)(pu)(pu)作(zuo)(zuo)(zuo)。殿(dian)(dian)內(nei)各鋪(pu)(pu)(pu)作(zuo)(zuo)(zuo)頂(ding)上(shang)(shang)(shang)架(jia)(jia)平枋(fang),裝設平,形(xing)成(cheng)(cheng)殿(dian)(dian)內(nei)空間(jian)(jian)。上(shang)(shang)(shang)層(ceng)為屋頂(ding)構(gou)架(jia)(jia)層(ceng)。除兩(liang)(liang)山外,沿(yan)各間(jian)(jian)進深(shen)在(zai)(zai)(zai)內(nei)外槽(cao)(cao)柱(zhu)之上(shang)(shang)(shang)及中(zhong)柱(zhu)間(jian)(jian)順串中(zhong)點之上(shang)(shang)(shang)(即脊下(xia))立(li)柱(zhu),壓在(zai)(zai)(zai)鋪(pu)(pu)(pu)作(zuo)(zuo)(zuo)上(shang)(shang)(shang)層(ceng)柱(zhu)頭枋(fang)上(shang)(shang)(shang),柱(zhu)間(jian)(jian)架(jia)(jia)梁(liang),形(xing)成(cheng)(cheng)深(shen)12架(jia)(jia)前后用5柱(zhu)的6道(dao)穿斗(dou)式草(cao)(cao)架(jia)(jia)。草(cao)(cao)架(jia)(jia)上(shang)(shang)(shang)架(jia)(jia)檁,構(gou)成(cheng)(cheng)屋頂(ding)。
殿(dian)四(si)周副(fu)階在下檐柱(zhu)上用四(si)鋪作斗,上承副(fu)階梁(liang)架(jia),副(fu)階梁(liang)尾均(jun)插(cha)入殿(dian)身檐柱(zhu)。
三(san)(san)清殿(dian)木構(gou)(gou)部(bu)(bu)分有幾點(dian)值得注意:①內(nei)槽(cao)(cao)(cao)柱(zhu)(zhu)頭(tou)和(he)補間(jian)(jian)(jian)鋪(pu)(pu)作(zuo)向內(nei)一側在(zai)(zai)第二跳華以(yi)上(shang)(shang)用了(le)向上(shang)(shang)斜舉的(de)上(shang)(shang)昂,前后(hou)內(nei)槽(cao)(cao)(cao)柱(zhu)(zhu)間(jian)(jian)(jian)順(shun)串(chuan)(chuan)(chuan)上(shang)(shang)三(san)(san)朵(duo)補間(jian)(jian)(jian)鋪(pu)(pu)作(zuo)均兩面(mian)出(chu)上(shang)(shang)昂,是(shi)現(xian)存早(zao)用于(yu)大木作(zuo)中(zhong)的(de)上(shang)(shang)昂實例。②《營(ying)造法(fa)(fa)(fa)式》殿(dian)堂型構(gou)(gou)架(jia)的(de)鋪(pu)(pu)作(zuo)層柱(zhu)(zhu)頭(tou)斗(dou)(dou)承托明,明同(tong)下(xia)面(mian)的(de)順(shun)串(chuan)(chuan)(chuan)間(jian)(jian)(jian)無(wu)補間(jian)(jian)(jian)鋪(pu)(pu)作(zuo)。此殿(dian)內(nei)槽(cao)(cao)(cao)前后(hou)柱(zhu)(zhu)間(jian)(jian)(jian)以(yi)順(shun)串(chuan)(chuan)(chuan)為梁,上(shang)(shang)置三(san)(san)朵(duo)補間(jian)(jian)(jian)鋪(pu)(pu)作(zuo),上(shang)(shang)面(mian)不加明,直(zhi)接(jie)用斗(dou)(dou)的(de)柱(zhu)(zhu)頭(tou)枋承上(shang)(shang)層屋頂(ding)構(gou)(gou)架(jia),與《營(ying)造法(fa)(fa)(fa)式》做法(fa)(fa)(fa)不同(tong),似(si)為明官式做法(fa)(fa)(fa)之(zhi)濫(lan)觴。③《營(ying)造法(fa)(fa)(fa)式》殿(dian)堂型構(gou)(gou)架(jia)內(nei)槽(cao)(cao)(cao)只沿周邊一圈有斗(dou)(dou),整個內(nei)槽(cao)(cao)(cao)是(shi)一個橫長的(de)、頂(ding)上(shang)(shang)呈頂(ding)形(xing)的(de)敞廳(ting)。此殿(dian)在(zai)(zai)內(nei)槽(cao)(cao)(cao)柱(zhu)(zhu)間(jian)(jian)(jian)順(shun)串(chuan)(chuan)(chuan)上(shang)(shang)也(ye)加斗(dou)(dou),把平截(jie)成五段,形(xing)成五個并(bing)列(lie)的(de)縱長形(xing)頂(ding)小廳(ting)。外槽(cao)(cao)(cao)平劃分也(ye)和(he)“金(jin)箱斗(dou)(dou)底(di)槽(cao)(cao)(cao)”小異。④唐、宋殿(dian)堂型構(gou)(gou)架(jia)柱(zhu)(zhu)子止(zhi)于(yu)鋪(pu)(pu)作(zuo)之(zhi)下(xia)。此殿(dian)雖(sui)絕大部(bu)(bu)分如此,但內(nei)槽(cao)(cao)(cao)后(hou)側中(zhong)間(jian)(jian)(jian)四(si)柱(zhu)(zhu)穿(chuan)過平上(shang)(shang)伸,后(hou)檐中(zhong)間(jian)(jian)(jian)六柱(zhu)(zhu)也(ye)直(zhi)抵(di)檐檁下(xia)。內(nei)槽(cao)(cao)(cao)明、次間(jian)(jian)(jian)四(si)道(dao)順(shun)串(chuan)(chuan)(chuan)上(shang)(shang),在(zai)(zai)中(zhong)間(jian)(jian)(jian)一朵(duo)補間(jian)(jian)(jian)鋪(pu)(pu)作(zuo)處各立(li)一根(gen)蜀柱(zhu)(zhu)。在(zai)(zai)這(zhe)14根(gen)柱(zhu)(zhu)上(shang)(shang),斗(dou)(dou)都插在(zai)(zai)柱(zhu)(zhu)身上(shang)(shang),顯示(shi)出(chu)南方流行的(de)穿(chuan)斗(dou)(dou)式構(gou)(gou)架(jia)特點(dian)。上(shang)(shang)述四(si)點(dian)中(zhong),后(hou)三(san)(san)點(dian)都反映了(le)官式做法(fa)(fa)(fa)和(he)地(di)方做法(fa)(fa)(fa)的(de)差異,兩者出(chu)現(xian)在(zai)(zai)同(tong)一座建(jian)筑(zhu)中(zhong),反映了(le)它們的(de)交(jiao)流融合(he)過程。
此殿(dian)現狀為(wei)沿副階柱(zhu)(zhu)開門(men)窗砌墻(qiang)。其門(men)窗、墻(qiang)壁、翼角、瓦件(jian)等(deng)屢經重修,已不能反映宋(song)代(dai)風貌。殿(dian)內柱(zhu)(zhu)、天花、草架(jia)也多經抽換更易。另(ling)在內槽明、次間四(si)道順串中點下有四(si)根柱(zhu)(zhu),矮于(yu)其他內柱(zhu)(zhu),它是原(yuan)有的還(huan)是后加的,還(huan)有不同(tong)看法。殿(dian)內槽有磚砌須彌座(zuo),上塑三(san)清像,雖經改(gai)裝,基(ji)本上仍(reng)是宋(song)代(dai)遺物。