(12)基(ji)坑支(zhi)護工程施(shi)工周期長，地下工程從(cong)開挖至(zhi)完成，鋪路(lu)鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)租賃，常常要(yao)經歷(li)多次降雨、周圍堆載、振動、施(shi)工不(bu)當等(deng)(deng)不(bu)利條件，其(qi)安全度的(de)隨時性(xing)較大(da)，發生突(tu)發事(shi)件的(de)可能性(xing)較大(da)。為避免(mian)挖溝土(tu)方后，用側(ce)向土(tu)壓力將鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)擠下，鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)施(shi)打完畢后，用H200*200*11*19mm的(de)工字鋼(gang)(gang)將明渠兩側(ce)的(de)拉森(sen)鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)分別連成一(yi)個整體，位置在(zai)樁(zhuang)頂下約左右，用電焊(han)條將其(qi)焊(han)牢，蚌埠鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)租賃，然后用空(kong)心圓鋼(gang)(gang)(200*12mm)每(mei)隔5米一(yi)根活動段，使兩根鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)對稱支(zhi)撐。在(zai)沉井基(ji)礎上，鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)圍堰的(de)大(da)小取(qu)決于沉井的(de)大(da)小，鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)圍堰內徑(jing)與沉井外徑(jing)相等(deng)(deng)時，沉井頂部應設置支(zhi)撐鋼(gang)(gang)板(ban)(ban)(ban)(ban)(ban)樁(zhuang)的(de)托盤。

按板樁圍堰高(gao)度計算。在(zai)(zai)施(shi)(shi)工(gong)(gong)過(guo)程中，可能(neng)由水位、沉井(jing)(jing)頂部高(gao)度、波浪高(gao)度以及沉井(jing)(jing)的(de)(de)超下(xia)沉等因素決定。建(jian)筑物(wu)改(gai)造(zao)施(shi)(shi)工(gong)(gong)單位。建(jian)筑鉆(zhan)孔(kong)(kong)類，主要(yao)包(bao)括墻孔(kong)(kong)、板孔(kong)(kong)、地(di)孔(kong)(kong)、橋孔(kong)(kong)、梁(liang)孔(kong)(kong)、柱孔(kong)(kong)、墻孔(kong)(kong)、大(da)理石孔(kong)(kong)和各(ge)種混凝土(tu)結構孔(kong)(kong)等。適合周邊場地(di)開闊，周圍無(wu)重要(yao)建(jian)筑物(wu)，僅要(yao)求(qiu)穩定，無(wu)嚴(yan)格的(de)(de)位移控(kong)制要(yao)求(qiu)，價(jia)格，鋼(gang)板租賃(lin)單價(jia)，填(tian)土(tu)較大(da)。深拌水泥土(tu)圍墻是(shi)利(li)用深拌設(she)(she)備在(zai)(zai)現場對土(tu)壤和輸(shu)入的(de)(de)水泥漿進(jin)行強行攪拌，形(xing)成(cheng)連續搭接的(de)(de)水土(tu)柱加實體擋(dang)墻。在(zai)(zai)河床面以下(xia)的(de)(de)沉井(jing)(jing)上(shang)，為便于(yu)沉井(jing)(jing)下(xia)沉，不宜在(zai)(zai)沉井(jing)(jing)上(shang)設(she)(she)置伸臂式托(tuo)盤，此(ci)時鋼(gang)板樁圍堰的(de)(de)外(wai)(wai)徑要(yao)小于(yu)沉井(jing)(jing)的(de)(de)外(wai)(wai)徑。支撐鋼(gang)板樁托(tuo)盤槽口(kou)外(wai)(wai)側應(ying)設(she)(she)置鋼(gang)條，鋼(gang)條強度應(ying)能(neng)滿足圍堰施(shi)(shi)工(gong)(gong)過(guo)程中內(nei)外(wai)(wai)水頭差產生(sheng)的(de)(de)較大(da)壓力，以防止鋼(gang)板樁在(zai)(zai)圍堰中炸(zha)裂(lie)。

打樁(zhuang)(zhuang)(zhuang)(zhuang)作業時，任何(he)人不得在(zai)已升起的(de)(de)(de)柴油(you)錘下進入。通常要(yao)(yao)求(qiu)鋼(gang)(gang)板(ban)樁(zhuang)(zhuang)(zhuang)(zhuang)安裝位置應符(fu)合設(she)(she)計(ji)要(yao)(yao)求(qiu)，便于溝槽基(ji)礎(chu)土方施工(gong)(gong)(gong)(gong)(gong)。升降機(ji)(ji)(ji)樁(zhuang)(zhuang)(zhuang)(zhuang)機(ji)(ji)(ji)動力配(pei)置布置即(ji)是(shi)在(zai)樁(zhuang)(zhuang)(zhuang)(zhuang)基(ji)突出的(de)(de)(de)邊沿外(wai)留有支撐模(mo)板(ban)，拆模(mo)板(ban)的(de)(de)(de)空間。同(tong)一(yi)圍堰的(de)(de)(de)鋼(gang)(gang)板(ban)樁(zhuang)(zhuang)(zhuang)(zhuang)只能(neng)采用同(tong)一(yi)鎖(suo)口。根據設(she)(she)計(ji)尺寸，工(gong)(gong)(gong)(gong)(gong)地鋼(gang)(gang)板(ban)租賃，確定使用鋼(gang)(gang)板(ban)樁(zhuang)(zhuang)(zhuang)(zhuang)的(de)(de)(de)數(shu)量(liang)，以(yi)確保足夠(gou)；去(qu)除(chu)、扭(niu)曲、變形的(de)(de)(de)鎖(suo)口的(de)(de)(de)鋼(gang)(gang)板(ban)樁(zhuang)(zhuang)(zhuang)(zhuang)；去(qu)除(chu)因焊接鋼(gang)(gang)板(ban)和鋼(gang)(gang)筋而在(zai)鋼(gang)(gang)板(ban)樁(zhuang)(zhuang)(zhuang)(zhuang)表面留下的(de)(de)(de)殘留物。可以(yi)承(cheng)接相關工(gong)(gong)(gong)(gong)(gong)程項目，如：拉森(sen)鋼(gang)(gang)板(ban)樁(zhuang)(zhuang)(zhuang)(zhuang)、水(shui)陸平臺、市(shi)政(zheng)截(jie)污(wu)工(gong)(gong)(gong)(gong)(gong)程、海岸工(gong)(gong)(gong)(gong)(gong)程、鋼(gang)(gang)結(jie)構工(gong)(gong)(gong)(gong)(gong)程、快裝式腳手架、排山式鋼(gang)(gang)管(guan)、租賃機(ji)(ji)(ji)械設(she)(she)備等項目地基(ji)基(ji)礎(chu)等，起吊力一(yi)般略小于減振器彈簧的(de)(de)(de)壓縮底(di)線。