施工試驗計劃

1. 參數確定

(1) 施工前在(zai)場地內選擇與(yu)工程(cheng)條件相類似地段，進(jin)行現場試驗(yan)確定(ding)施工工藝參數(shu)。

(2) 為工程(cheng)開工準(zhun)備，先選擇工程(cheng)中少量部分(fen)進行試驗(yan)性施(shi)工確定施(shi)工工藝參數。

(3) 施(shi)工中發(fa)現使用的技術參數有問題(ti)，應當及時進行修正和調(diao)整(zheng)施(shi)工工藝參數。

2. 施工試驗

(1) 根據工(gong)程需(xu)要(yao)開工(gong)前試驗，可選擇(ze)旋噴(pen)(pen)注漿、擺噴(pen)(pen)注漿和(he)定噴(pen)(pen)注漿等類別。

(2) 噴射形(xing)式和結構，可選(xuan)擇(ze)旋噴樁、擺噴墻、定噴板單噴和連接(jie)或圍井試驗。

測量(liang)孔深:鉆孔終孔時(shi)測量(liang)鉆桿鉆具長(chang)度，孔深大于(yu)20m時(shi)，進行孔內(nei)測斜。

下噴(pen)(pen)射(she)管:鉆孔經驗收合格后(hou)，方可進行高壓噴(pen)(pen)射(she)注漿，下噴(pen)(pen)射(she)管前檢查以(yi)下事項。

1) 測量噴(pen)射管長度，測量噴(pen)嘴中心線是否與噴(pen)射管方向(xiang)箭一致，噴(pen)射管應(ying)標識尺度。

2) 將噴頭(tou)置于高壓水(shui)泵附近，試(shi)壓管路應小于20m，試(shi)噴調(diao)為設計噴射壓力。

3) 施工時下噴射(she)(she)管前進(jin)行地面水、氣、漿試噴，即(ji)設計噴射(she)(she)壓力(li)+管路壓力(li)。

4) 設計(ji)噴(pen)射壓力(li)+管路壓力(li)為施(shi)工(gong)用的標準噴(pen)射壓力(li)，更換(huan)噴(pen)嘴時重新調(diao)試。

5) 擺噴(pen)施工下噴(pen)射(she)管前(qian)，應(ying)進行地面(mian)試噴(pen)并調(diao)準噴(pen)射(she)方向和擺動角度(du)。

6) 地(di)面試噴經驗(yan)收合格后，下入(ru)噴射管時，應采取(qu)措施防止噴嘴堵塞。

7) 孔內(nei)沉(chen)淀物較(jiao)多時，應事先準備黏(nian)土泥(ni)漿(jiang)，下(xia)噴射(she)管時邊沖(chong)入泥(ni)漿(jiang)邊下(xia)管。

8) 鉆孔當采用(yong)套管(guan)(guan)護壁時，下(xia)入噴射管(guan)(guan)后，拔(ba)出護壁套管(guan)(guan)。

9) 當采用振(zhen)沖沉管時，必(bi)須(xu)滿足以上(shang)要求。

10) 當噴射管下至設計深度時，旋噴樁施工，經監理工程師批準后，準備開噴。

旋(xuan)(xuan)(xuan)擺(bai)(bai)提(ti)(ti)(ti)升(sheng)(sheng):單嘴(zui)(zui)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)頭擺(bai)(bai)360°為(wei)(wei)(wei)旋(xuan)(xuan)(xuan)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);小(xiao)于(yu)360°為(wei)(wei)(wei)弧噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);小(xiao)于(yu)等(deng)于(yu)180°為(wei)(wei)(wei)拱(gong)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);小(xiao)于(yu)等(deng)于(yu)90°為(wei)(wei)(wei)擺(bai)(bai)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);擺(bai)(bai)角(jiao)為(wei)(wei)(wei)0°時(shi)為(wei)(wei)(wei)單向(xiang)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)。同軸(zhou)雙(shuang)(shuang)(shuang)嘴(zui)(zui)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)頭擺(bai)(bai)180°為(wei)(wei)(wei)旋(xuan)(xuan)(xuan)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);小(xiao)于(yu)180°為(wei)(wei)(wei)雙(shuang)(shuang)(shuang)向(xiang)拱(gong)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);小(xiao)于(yu)等(deng)于(yu)90°為(wei)(wei)(wei)雙(shuang)(shuang)(shuang)向(xiang)擺(bai)(bai)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen);擺(bai)(bai)角(jiao)為(wei)(wei)(wei)0°時(shi)為(wei)(wei)(wei)雙(shuang)(shuang)(shuang)向(xiang)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)。非同軸(zhou)雙(shuang)(shuang)(shuang)嘴(zui)(zui)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)頭有90°夾角(jiao)、120°夾角(jiao)、150°夾角(jiao)，可用(yong)(yong)于(yu)擺(bai)(bai)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)和(he)(he)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)。多嘴(zui)(zui)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)頭目(mu)前國內使用(yong)(yong)的不多。旋(xuan)(xuan)(xuan)擺(bai)(bai)為(wei)(wei)(wei)機(ji)械旋(xuan)(xuan)(xuan)擺(bai)(bai)和(he)(he)特殊環境(jing)下人工旋(xuan)(xuan)(xuan)擺(bai)(bai)。 1) 高壓(ya)旋(xuan)(xuan)(xuan)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)切割(ge)土(tu)(tu)體(ti)一周，旋(xuan)(xuan)(xuan)擺(bai)(bai)和(he)(he)提(ti)(ti)(ti)升(sheng)(sheng)速(su)度(du)(du)慢，噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)半徑(jing)(jing)長(chang)，形成(cheng)樁(zhuang)徑(jing)(jing)大。 2) 高壓(ya)擺(bai)(bai)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)切割(ge)土(tu)(tu)體(ti)，擺(bai)(bai)動和(he)(he)提(ti)(ti)(ti)升(sheng)(sheng)速(su)度(du)(du)慢，噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)半徑(jing)(jing)長(chang)，形成(cheng)凝固(gu)(gu)體(ti)積大。 3) 高壓(ya)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)切割(ge)土(tu)(tu)體(ti)，提(ti)(ti)(ti)升(sheng)(sheng)速(su)度(du)(du)慢，噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)半徑(jing)(jing)長(chang)，形成(cheng)凝固(gu)(gu)體(ti)板長(chang)。 4) 提(ti)(ti)(ti)升(sheng)(sheng)速(su)度(du)(du)應與注漿(jiang)量匹配(pei)，供漿(jiang)量應滿足提(ti)(ti)(ti)速(su)，提(ti)(ti)(ti)速(su)應滿足噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)半徑(jing)(jing)長(chang)度(du)(du)。 5) 高壓(ya)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)注漿(jiang)機(ji)械旋(xuan)(xuan)(xuan)擺(bai)(bai)，形成(cheng)凝固(gu)(gu)體(ti)積規(gui)則，人工旋(xuan)(xuan)(xuan)擺(bai)(bai)，形成(cheng)凝固(gu)(gu)體(ti)積不規(gui)則。 6) 旋(xuan)(xuan)(xuan)擺(bai)(bai)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)過(guo)程中要(yao)固(gu)(gu)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)方(fang)(fang)向(xiang)樁(zhuang)，以便(bian)隨時(shi)檢查和(he)(he)防止(zhi)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)方(fang)(fang)向(xiang)位(wei)(wei)移(yi)。 7) 噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)過(guo)程中接(jie)卸換管時(shi)要(yao)檢查噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)方(fang)(fang)向(xiang)，防止(zhi)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)方(fang)(fang)向(xiang)位(wei)(wei)移(yi)。 8) 按設計要(yao)求(qiu)旋(xuan)(xuan)(xuan)擺(bai)(bai)定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)提(ti)(ti)(ti)升(sheng)(sheng)，自下而上(shang)至設計標(biao)高，停(ting)止(zhi)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)，提(ti)(ti)(ti)出(chu)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)射(she)(she)(she)(she)(she)管。 9) 旋(xuan)(xuan)(xuan)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)注漿(jiang)適(shi)用(yong)(yong)于(yu)細顆(ke)(ke)粒和(he)(he)粗顆(ke)(ke)粒松(song)散(san)(san)地(di)(di)層，定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen)注漿(jiang)適(shi)用(yong)(yong)于(yu)細顆(ke)(ke)粒松(song)散(san)(san)地(di)(di)層。 a. 定噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen):適(shi)用(yong)(yong)于(yu)黏性土(tu)(tu)、粉(fen)土(tu)(tu)、砂土(tu)(tu)細顆(ke)(ke)粒松(song)散(san)(san)地(di)(di)層。 b. 擺(bai)(bai)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen):適(shi)用(yong)(yong)于(yu)黏性土(tu)(tu)、粉(fen)土(tu)(tu)、砂土(tu)(tu)、礫石(shi)中顆(ke)(ke)粒松(song)散(san)(san)地(di)(di)層。 c. 旋(xuan)(xuan)(xuan)噴(pen)(pen)(pen)(pen)(pen)(pen)(pen)(pen):適(shi)用(yong)(yong)于(yu)黏性土(tu)(tu)、粉(fen)土(tu)(tu)、砂土(tu)(tu)、礫石(shi)、卵石(shi)粗顆(ke)(ke)粒松(song)散(san)(san)地(di)(di)層。