201114986 六、發明說明： 【發明所屬之技術領域】 本發明係關於高壓噴射攪拌工法（jet grouting工法 )及本工法所使用之自鑽孔監測器，主要是關於在鑽孔時 可避免從固化材液噴射噴嘴放出無用的鑽孔水，而能提昇 鑽孔效率並減少鑽孔水的損失。 【先前技術】 關於利用高壓噴射攪拌之地盤改良工法，例如第3圖 所圖示，從注入管桿1的前端噴射鑽孔水並切削地盤，當 鑽孔進行到計畫深度之後，從注入管桿1的前端噴射固化 材液，且將注入管桿1以繞其軸旋轉的狀態逐漸往上拉， 藉此在注入管桿1的周圍形成由切削土和固化材液所構成 之柱狀的地盤改良體A，此方法是已知的。 在此情況，在注入管桿1的前端部連接著自鑽孔監測 器2，當進行鑽孔時，其會噴射鑽孔水而將地盤鑽孔，又 當進行地盤改良時，其會將固化材液以高壓噴射至地盤中 而形成地盤改良體A。 自鑽孔監測器2，例如第4圖所圖示，在監測器主體 的下端部設有掘削鑽頭3和鑽孔水噴射噴嘴4，在側部設 有固化材液噴射噴嘴5和壓縮空氣噴射噴嘴6 ;又在監測 器主體內置有：用來壓送鑽孔水和固化材液之液體壓送流 路7以及用來壓送壓縮空氣之壓縮空氣壓送流路8，液體 壓送流路7是兼作爲鑽孔水壓送流路和固化材液壓送流路 201114986 雙方。 而且，在進行鑽孔時，是在液體壓送流路7內壓送鑽 孔水，從鑽孔水噴射噴嘴4以高壓噴射鑽孔水而將監測器 主體下方的地盤施以切削，藉此能將注入管桿1插入至計 畫深度。 另一方面，在進行地盤改良時，是將止水球9投入液 體壓送流路7內以將鑽孔水噴射噴嘴4從內側塞住後，將 在液體壓送流路7內壓送固化材液，並從固化材液噴射噴 嘴5將固化材液以高壓噴射至地盤中，同時將自鑽孔監測 器2以和注入管桿1 一起以繞軸旋轉的狀態逐漸往上拉， 藉此可在注入管桿1的周圍形成由固化材液和切削土所構 成之柱狀的地盤改良體A。 在此情況，藉由固化材液的噴射噴流將地盤施以切削 ’被切削的土石和固化材液經由混合攪拌而形成地盤改良 體A。此外，從壓縮空氣噴射噴嘴6讓壓縮空氣沿著所噴 射出之固化材液的周圍噴射，藉此可抑制固化材液的噴射 能量因地下水而減弱^ [專利文獻1]日本特開2008-95442號公報 【發明內容】 然而’內置於監測器主體之液體壓送流路，是兼作爲 鑽孔水流路和固化材液流路雙方的流路，又鑽孔水噴射噴 嘴並未被塞住’因此’在一邊藉由自鑽孔監測器進行鑽孔 一邊將注入管桿插入到計畫深度的期間，藉由液體壓送流 _ 6 - 201114986 路壓送的鑽孔水也會從固化材液噴射噴嘴5放出。 因此，當對象地盤爲較硬質的地盤的情況，鑽孔水的 壓力變高，結果從固化材液噴射噴嘴會逸出多量的鑽孔水 ，不僅使鑽孔陷入困難，且會使鑽孔水的損失變大。 此外，在連接注入管桿時、或從鑽孔水切換成固化材 液時，由於液體壓送流路暫時成爲減壓狀態，起因於地下 水的靜水壓會使地中的地盤砂進入固化材液噴射噴嘴內’ 而使固化材液噴射噴嘴有發生堵塞之虞。 此外，關於可防止固化材液噴射噴嘴發生堵塞之自鑽 孔監測器，在固化材液噴射噴嘴的前端部設置覆蓋噴嘴前 端部之封止部，在進行地盤改良時藉由固化材液的噴射壓 力來解除封止，這種構造的自鑽孔監測器已被揭示出（專 利文獻1 )。 然而，專利文獻1所記載的自鑽孔監測器的情況，由 於封止部安裝在固化材液噴射噴嘴的外側，由於在鑽孔中 和周圍的地盤發生摩擦，有容易脫離之虞。 本發明是爲了解決以上的課題而開發完成的，其目的 是爲了提供一種自鑽孔監測器及高壓噴射攪拌工法，在進 行鑽孔時可避免從固化材液噴射噴嘴放出無用的鑽孔水， 可提昇鑽孔效率並減少鑽孔水的損失。 申請專利範圍第1項記載的自鑽孔監測器，是在下端 部具備鑽孔水噴射噴嘴，在側部具備固化材液噴射噴嘴， 且內置液體流路之自鑽孔監測器，該液體流路係兼作爲壓 送鑽孔水至前述鑽孔水噴射噴嘴之液體流路和壓送固化材 201114986 液至前述固化材液噴射噴嘴之液體流路； 其特徵在於：在前述固化材液噴射噴嘴內具備監測器 用塞子，該塞子是形成：在鑽孔時可塞住固化材液噴射噴 嘴，在地盤改良時會被固化材液的噴射壓力推出噴嘴外。 依據本發明，在鑽孔時及從鑽孔水切換成固化材液時 ，固化材液噴射噴嘴會被監測器用塞子塞住，藉此可防止 在鑽孔時從固化材液噴射噴嘴放出無用的鑽孔水；此外， 在鑽孔完成而從鑽孔水切換成固化材液時，可防止地下水 壓造成土等進入固化材液噴射噴嘴內，因此可提昇鑽孔效 率，而具有可高效率地進行地盤改良等之效果。 通常，鑽孔時鑽孔水的送水壓力爲2MPa左右，又地 盤改良時固化材液的噴射壓力爲10〜40MPa左右，因此可 將自鑽孔監測器用塞子的材質、硬度、大小、形狀等設定 成：在2MPa左右的送水壓力程度下，不致被推出噴嘴外 而能維持在固化材液噴射噴嘴內，又在10〜40MPa左右的 固化材液的噴射壓力下會被推出噴嘴外。 申請專利範圍第2項記載的自鑽孔監測器，是在申請 專利範圍第1項記載的自鑽孔監測器中，監測器用塞子， 是對應於固化材液噴射噴嘴之內周面的形狀（內周面形成 朝前端方向逐漸變小徑之圓錐狀），而具備朝前端方向逐 漸形成小徑之圓錐狀部。 依據本發明，監測器用塞子之圓錐狀部的外周面是形 成朝固化材液噴射噴嘴的前端方向逐漸變小徑之錐面，如 此鑽孔時鑽孔水的送水壓力不容易將監測器用塞子推出固 201114986 化材液噴射噴嘴外，而能防止從固化材液噴射噴嘴放出無 用的鑽孔水。 此外，由於圓錐狀部之內側端面的截面積比外側（前 端側）端面更大，對於監測器用塞子從噴嘴內側往外的作 用力量比從噴嘴的外側往內的作用力更大。 因此，即使在從鑽孔水切換成固化材液時等讓噴嘴內 暫時成爲減壓狀態，仍不致將監測器用塞子往噴嘴內側推 入，可避免土等進入噴嘴內而發生噴嘴的堵塞。 申請專利範圍第3項記載的自鑽孔監測器，是在申請 專利範圍第1或2項記載的自鑽孔監測器中，監測器用塞 子是由彈性材料所形成。作爲這種情況之自鑽孔監測器用 塞子的材質，基於取得及加工容易且硬度可自由調整等的 理由，例如橡膠和塑膠等是更適合的。 申請專利範圍第4項記載的高壓噴射攪拌工法，是使 用自鑽孔監測器來形成地盤改良體之高壓噴射攪拌工法； 該自鑽孔監測器，是在下端部具備鑽孔水噴射噴嘴，在側 部具備固化材液噴射噴嘴，且內置液體流路之自鑽孔監測 器，該液體流路係兼作爲壓送鑽孔水至前述鑽孔水噴射噴 嘴之液體流路和壓送固化材液至前述固化材液噴射噴嘴之 液體流路； 其特徵在於，係具備以下步驟： 使用申請專利範圍第1至3項中任一項記載的自鑽孔 監測器’在該自鑽孔監測器之固化材液噴射噴嘴內安裝監 測器用塞子以塞住固化材液噴射噴嘴的步驟；在前述液體 -9- 201114986 流路壓送鑽孔水，從鑽孔水噴射噴嘴噴射鑽孔水而將地盤 鑽孔的步驟；在前述液體流路壓送固化材液，藉由從前述 固化材液噴射噴嘴所噴射之固化材液的噴射壓力將監測器 用塞子推出固化材液噴射噴嘴外的步驟；以及從固化材液 噴射噴嘴朝地盤中噴射固化材液並將自鑽孔監測器逐漸往 上拉的步驟。 本發明，在鑽孔時及從鑽孔水切換成固化材液時等， 固化材液噴射噴嘴是被監測器用塞子所塞住，藉此在鑽孔 時可抑制從固化材液噴射噴嘴放出無用的鑽孔水，此外在 鑽孔完成而從鑽孔水切換成固化材液時，可防止地下水壓 造成土等進入固化材液噴射噴嘴內，因此可提昇鑽孔效率 ，而具有可高效率且經濟地進行地盤改良等的效果。 【實施方式】 第1(a) (b)圖係顯示連接於注入管桿的前端部之 自鑽孔監測器的前端部分，第2 ( a ) ( b )圖係顯示安裝 於自鑽孔監測器之固化材液噴射噴嘴和監測器用塞子。 圖中，在監測器主體的下端部設有掘削鑽頭3和鑽孔 水噴射噴嘴4，在側部設有固化材液噴射噴嘴5和壓縮空 氣噴射噴嘴6。 再者，在監測器主體內置有：壓送鑽孔水和固化材液 之液體壓送流路7、以及壓送壓縮空氣之空氣壓送流路8 :液體壓送流路7連接於鑽孔水噴射噴嘴4和固化材液噴 射噴嘴5，是兼作爲壓送鑽孔水的流路和壓送固化材液的 -10- 201114986 流路雙方。空氣壓送流路8連接於壓縮空氣噴射噴嘴6» 固化材液噴射噴嘴5和壓縮空氣噴射噴嘴6是設置成 同心圓狀，在內側設置固化材液噴射噴嘴5，在其外周設 置壓縮空氣噴射噴嘴6。 再者，固化材液噴射噴嘴5，是沿著監測器主體的直 徑方向形成既定的長度，其前端開口於監測器主體的側面 。此外，固化材液噴射噴嘴5的內徑，在前端部分5a是 遍及一定長度形成最細的一定內徑，在基端部分5b是遍 及一定長度形成比前端部分5a粗之一定內徑，且在前端 部分5a和基端部分5b間的中間部分5c是形成從前端部 分5a側往基端部分5b側方向逐漸變粗。 而且，在如此般形成的固化材液噴射噴嘴5內，安裝 監測器用塞子10。監測器用塞子10係具備：其截面形狀 分別與固化材液噴射噴嘴5的前端部分5a及中間部分5c 的內部形狀對應之柱狀部10a及圓錐狀部10b。 柱狀部1 〇a，是形成可插入固化材液噴射噴嘴5的前 端部分5a之圓柱狀，圓錐狀部l〇b，則是形成可插入固 化材液噴射噴嘴5的中間部分5 c之圓錐狀，而且任一部 分都是形成：在插入固化材液噴射噴嘴5的前端部分5a 和中間部分5c時，可完全密合於固化材液噴射噴嘴5的 前端部分5 a和中間部分5 c之內周面。 再者，柱狀部10a及圓錐狀部10b，是使用橡膠或塑 膠等的彈性材料以一體的方式形成。 在此構造下，要將注入管桿1插入至既定深度時，是 -11 - 201114986 在液體壓送流路7內壓送鑽孔水’並從鑽孔水噴射噴嘴4 朝地盤中以高壓噴射鑽孔水，藉此切削地盤而能使注入管 桿1插入至既定深度。 這時，特別是藉由監測器用塞子1 〇將固化材液噴射 噴嘴5完全塞住，因此不會由固化材液噴射噴嘴5放出無 用的鑽孔水，能夠極高效率地進行鑽孔，而且不致放出無 用的鑽孔水。 在此情況，藉由在液體壓送流路7內壓送的鑽孔水， 雖會有2MPa左右的送水壓作用於監測器用塞子10的內 側，但由於監測器用塞子1 〇之圓錐狀部1 〇b的外周面是 形成朝固化材液噴射噴嘴5的前端方向逐漸變小徑之錐面 ，因此監測器用塞子10不容易被鑽孔水的送水壓推出固 化材液噴射噴嘴5外。 此外，來自外部之地下水造成的靜水壓P1雖會向內 作用於監測器用塞子10，由於圓錐狀部l〇b之內側端面 的面積s 1比柱狀部1 0a之外側端面的面積S2更大，相較 於從噴嘴5外側作用於監測器用塞子10之向內的力，從 噴嘴5內側作用於監測器用塞子1 0之向外的力更大。 因此，即使在從鑽孔水切換成固化材液時等讓噴嘴5 內暫時成爲減壓狀態，仍不致將監測器用塞子1 〇往噴嘴 5內側推入，可避免土等進入噴嘴5內而發生噴嘴5之堵 塞。 在此情況，也能使監測器用塞子1 〇之柱狀部1 〇a的 外徑形成比固化材液噴射噴嘴5之前端部分5a的內徑稍 -12- 201114986 大，或是適當地改變柱狀部l〇a的直徑 部1 0a的外周面和固化材液噴射噴嘴5 內周面之摩擦力，藉此來調整反抗向內 另一方面，在朝地盤中噴射固化材 時，是在液體壓送流路7內投入止水球 射噴嘴4之後，在液體壓送流路7內是 固化材液，從固化材液噴射噴嘴5以高 並將安裝於固化材液噴射噴嘴5內之監 用固化材液的噴射壓力往外推出，藉此 至地盤中而進行地盤改良。 在此情況，藉由在液體壓送流路7 ，會有10〜40MPa之非常大的噴射壓力 子1 〇，監測器用塞子1 〇會發生收縮變 液噴射噴嘴5外。 此外，藉由改變圓錐狀部1 〇b的長 整圓錐狀部1 〇 b之內側端面的面積S 1 液的噴射壓力往外推出時之監測器用塞· 接著說明：使用本發明之安裝有監 孔監測器，進行高壓噴射攪拌工法的施. (1 )首先，在固化材液噴射噴嘴 塞子1 〇。在此情況，固化材液噴射噴嗔 方式拆裝自如地安裝於監測器主體，因 射噴嘴5從監測器主體卸下後’從其後 以適當地適整柱狀 的前端部分5a的 的壓力P1之阻力 液而進行地盤改良 9來塞住鑽孔水噴 取代鑽孔水而壓送 壓噴射固化材液， 測器用塞子1 〇利 能將固化材液噴射 內壓送之固化材液 作用於監測器用塞 形而被推出固化材 度L1並適當地適 ，可調整被固化材 子1 0的阻力。 測器用塞子的自鑽 工順序。 5內安裝監測器用 I 5通常是以螺合 此可將固化材液噴 方將監測器用塞子 -13- 201114986 10插入噴嘴5內，藉此來進行安裝。 (2 )接著，將安裝有監測器用塞子1 〇之自鑽孔監測 器2連接於注入管桿1的前端部。然後，在自鑽孔監測器 2內的液體壓送流路7內，從地下經由注入管桿1壓送鑽 孔水，同時將自鑽孔監測器2以和注入管桿1 一起旋轉的 狀態推入地盤中以進行鑽孔。 此外，壓縮空氣噴射噴嘴6，爲了防止在鑽孔中土等 進入而發生堵塞，較佳爲先用封口件或蓋子等（能藉由從 噴嘴6噴射出的壓縮空氣除去）塞住。 此外，將這種封口件或蓋子附加在監測器用塞子10 上，藉由固化材液的噴射壓力來和監測器用塞子一起除去 亦可。 (3 )若鑽孔進行至計畫深度的話，朝自鑽孔監測器 2內的液體壓送流路7內投入止水球9而將鑽孔水噴射噴 嘴4塞住。 (4 )接著，在自鑽孔監測器2內的液體壓送流路7 ，從地上經由注入管桿1壓送固化材液，藉由固化材液的 噴射壓力將固化材液噴射噴嘴5內的監測器用塞子1 0推 出噴嘴5外而使噴嘴5打開。 (5 )接著，在自鑽孔監測器2內的液體壓送流路7 內壓送固化材液並在壓縮空氣流路8內壓送壓縮空氣，藉 此從固化材液噴射噴嘴5以高壓噴射固化材液，並從壓縮 空氣噴射噴嘴6以高壓噴射壓縮空氣。 而且，同時將自鑽孔監測器2以和注入管桿1 一起繞 -14 - 201114986 軸旋轉的狀態逐漸往上拉，藉由在注入管桿1的周圍形成 由切削土和固化材液所構成的地盤改良體A。 本發明所提供之自鑽孔監測器及高壓噴射攪拌工法， 在鑽孔時可防止從固化材液噴射噴嘴放出無用的鑽孔水， 能提昇鑽孔效率而減少鑽孔水的損失。 【圖式簡單說明】 第1圖係顯示自鑽孔監測器的前端部分；第1(a) 圖係顯示安裝有監測器用塞子而噴射鑽孔水的狀態之縱截 面圖；第1(b)圖係顯示將監測器用塞子往外推出而噴 射固化材液的狀態之縱截面圖。 第2圖係顯示固化材液噴射噴嘴；第2 ( a )圖係顯 示安裝有監測器用塞子的狀態之縱截面圖，第2(b)圖 係顯示安裝監測器用塞子前的狀態之縱截面圖。 第3 ( a )〜（d )圖係使用自鑽孔監測器之高壓噴射 攪拌工法的施工順序。 第4圖係顯示自鑽孔監測器的前端部分；第4(a) 圖係顯示噴射鑽孔水的狀態之縱截面圖，第4 ( b )圖係 顯示噴射固化材液的狀態之縱截面圖。 【主要元件符號說明】 1 :注入管桿 2 :自鑽孔監測器 3 :掘削鑽頭 -15- 201114986 4 :鑽孔水噴射噴嘴 5 :固化材液噴射噴嘴 6:壓縮空氣噴射噴嘴 7 :液體壓送流路 8 :壓縮空氣壓送流路 9 :止水球 1 〇 :監測器用塞子 l〇a :柱狀部 l〇b :圓錐狀部 A :地盤改良體 -16201114986 VI. Description of the Invention: [Technical Field] The present invention relates to a high-pressure jet mixing method (jet grouting method) and a self-drilling monitor used in the present method, mainly for avoiding curing of materials during drilling The liquid jet nozzles release useless drilling water, which improves drilling efficiency and reduces the loss of drilling water. [Prior Art] Regarding the improvement method of the ground using high-pressure jet agitation, for example, as illustrated in Fig. 3, the drilling water is sprayed from the front end of the injection pipe rod 1 and the ground is cut, and after the drilling proceeds to the planned depth, the injection pipe is taken from the injection pipe. The front end of the rod 1 sprays the solidified material liquid, and the injection pipe rod 1 is gradually pulled up in a state of being rotated about its axis, thereby forming a columnar shape composed of the cutting soil and the solidified liquid material around the injection pipe rod 1. Site improvement body A, this method is known. In this case, the self-drilling monitor 2 is connected to the front end portion of the injection pipe rod 1, and when drilling, it will spray drilling water to drill the ground plate, and when the grounding plate is improved, it will solidify. The liquid liquid is sprayed into the ground plate at a high pressure to form the ground improvement body A. The self-drilling monitor 2, for example, as illustrated in Fig. 4, is provided with a boring bit 3 and a borehole water jet nozzle 4 at a lower end portion of the monitor main body, and a solidified material liquid jet nozzle 5 and a compressed air jet are provided at the side portion. The nozzle 6 is further provided with a liquid pressure feed flow path 7 for pumping the drilling water and the solidified liquid, and a compressed air pressure supply flow path 8 for pumping the compressed air, and the liquid pressure feed flow path. 7 is also used as both the drilling water pressure delivery flow path and the solidified material hydraulic delivery flow path 201114986. Further, when drilling is performed, the drilling water is pumped in the liquid pressure feed passage 7, and the drilling water is sprayed from the drilling water injection nozzle 4 at a high pressure to cut the ground below the monitor main body. The injection tube rod 1 can be inserted to the planned depth. On the other hand, when the grounding is improved, the water stop ball 9 is introduced into the liquid pressure feed flow path 7 to plug the drill water jet nozzle 4 from the inside, and the solidified material is pressure-fed in the liquid pressure feed flow path 7. Liquid, and ejecting the solidified liquid from the solidified material liquid ejecting nozzle 5 to the ground plate at a high pressure, while gradually pulling up the self-drilling monitor 2 in a state of being rotated around the shaft together with the injection pipe rod 1 A column-shaped ground improvement body A composed of a solidified material liquid and a cutting soil is formed around the injection pipe rod 1. In this case, the ground disc is subjected to the cutting of the cut earth and the solidified liquid by the jetting of the solidified liquid to form the ground improved body A by mixing and stirring. Further, the compressed air is ejected from the compressed air ejecting nozzle 6 around the solidified liquid to be ejected, whereby the ejection energy of the solidified liquid can be suppressed from being weakened by the groundwater. [Patent Document 1] JP-A-2008-95442 No. [Invention] However, the liquid pressure feed path built in the main body of the monitor is a flow path that serves as both the drilling water flow path and the solidified material flow path, and the drilling water injection nozzle is not blocked. Therefore, while the injection pipe rod is inserted into the depth of the plan while drilling by the self-drilling monitor, the drilling water sent by the liquid pressure feed _ 6 - 201114986 will also be from the solidified liquid. The spray nozzle 5 is discharged. Therefore, when the target site is a relatively hard ground, the pressure of the drilling water becomes high, and as a result, a large amount of drilling water is escaped from the solidified liquid injection nozzle, which not only makes the drilling difficult, but also causes drilling water. The loss has become larger. In addition, when the injection pipe rod is connected or when the drilling water is switched to the solidified liquid, the liquid pressure feed flow path is temporarily decompressed, and the hydrostatic pressure caused by the groundwater causes the ground sand in the ground to enter the solidified material. In the liquid jet nozzle, the solidified liquid injection nozzle is clogged. In addition, the self-drilling monitor that prevents the clogging of the solidified material liquid ejecting nozzle is provided with a sealing portion that covers the tip end portion of the nozzle at the tip end portion of the solidified material liquid ejecting nozzle, and is ejected by the solidified liquid during the improvement of the ground material. Pressure is applied to release the seal, and a self-drilling monitor of such a configuration has been disclosed (Patent Document 1). However, in the case of the self-drilling monitor described in Patent Document 1, since the sealing portion is attached to the outside of the solidified material liquid ejecting nozzle, it is easily detached due to friction in the drilling hole and the surrounding ground. The present invention has been developed to solve the above problems, and an object thereof is to provide a self-drilling monitor and a high-pressure jet mixing method, which can prevent useless drilling water from being discharged from a solidified material liquid spray nozzle during drilling. Improves drilling efficiency and reduces the loss of drilling water. The self-drilling monitor disclosed in the first aspect of the invention is a self-drilling monitor having a drilling water jet nozzle at a lower end portion and a solidified material liquid jet nozzle at a side portion, and a liquid flow path is built in the liquid flow. The road system serves as a liquid flow path for pumping the drilling water to the drilling water jet nozzle and the liquid flow path of the pressure solidifying material 201114986 liquid to the solidified material liquid jetting nozzle; and characterized in that: the solidified material liquid spray nozzle There is a plug for the monitor, which is formed by plugging the solidified material liquid spray nozzle during drilling, and is pushed out of the nozzle by the injection pressure of the solidified liquid when the ground is improved. According to the present invention, the solidified material liquid ejecting nozzle is plugged by the monitor with a plug during drilling and when switching from the drilling water to the solidified liquid, thereby preventing useless discharge from the solidified liquid ejecting nozzle during drilling. Drilling water; in addition, when the drilling is completed and the molten water is switched from the drilling water to the solidified liquid, the groundwater pressure can be prevented from entering the solidified liquid injection nozzle, thereby improving the drilling efficiency and efficiently Perform the effects of site improvement, etc. Generally, the water supply pressure of the drilling water during drilling is about 2 MPa, and the injection pressure of the solidified liquid is about 10 to 40 MPa when the ground is improved. Therefore, the material, hardness, size, shape, etc. of the plug for the self-drilling monitor can be set. In the degree of water supply pressure of about 2 MPa, it can be maintained in the solidified liquid injection nozzle without being pushed out of the nozzle, and is pushed out of the nozzle under the injection pressure of the solidified liquid of about 10 to 40 MPa. The self-drilling monitor according to the second aspect of the invention is the self-drilling monitor according to the first aspect of the invention, wherein the stopper for the monitor is shaped corresponding to the inner circumferential surface of the solidified liquid injection nozzle ( The inner peripheral surface has a conical shape which gradually becomes smaller in the distal end direction, and has a conical portion which gradually forms a small diameter toward the distal end direction. According to the present invention, the outer peripheral surface of the conical portion of the stopper for the monitor is formed into a tapered surface which gradually becomes smaller toward the front end of the solidified material liquid ejecting nozzle, so that the water supply pressure of the drilling water does not easily push the monitor out with the plug. Solid 201114986 The chemical liquid injection nozzle prevents the use of the use of drilling water from the solidified liquid injection nozzle. Further, since the cross-sectional area of the inner end surface of the conical portion is larger than the outer end (front end side) end face, the force for the monitor plug from the inside of the nozzle to the outside is greater than the force from the outside of the nozzle. Therefore, even if the inside of the nozzle is temporarily decompressed when switching from the drilling water to the solidified liquid, the stopper of the monitor is not pushed into the inside of the nozzle, and the clogging of the nozzle can be prevented by entering the inside of the nozzle. The self-drilling monitor according to the third aspect of the invention is the self-drilling monitor according to the first or second aspect of the patent application, wherein the stopper for the monitor is formed of an elastic material. The material of the plug for the self-drilling monitor in this case is more suitable for reasons such as easy acquisition and processing, and freely adjustable hardness, such as rubber and plastic. The high-pressure jet mixing method described in claim 4 is a high-pressure jet mixing method using a self-drilling monitor to form a ground improved body; the self-drilling monitor has a drilling water jet nozzle at a lower end portion, a self-drilling monitor having a liquid-liquid ejecting nozzle at the side and a liquid flow path, the liquid flow path serving as a liquid flow path for pumping the drilling water to the drilling water jet nozzle and the pressure-carrying liquid a liquid flow path to the solidified material liquid ejecting nozzle; characterized by comprising the following steps: using the self-drilling monitor described in any one of claims 1 to 3 in the self-drilling monitor a step of installing a monitor plug in the solidified material liquid spray nozzle to block the solidified liquid spray nozzle; in the liquid-9- 201114986 flow path, the drilling water is pumped, and the drilling water is sprayed from the drilling water spray nozzle to drill the ground. a step of squeezing the solidified material in the liquid flow path, and ejecting the monitor liquid from the stopper by the ejection pressure of the solidified liquid sprayed from the solidified liquid liquid ejecting nozzle a step outside the nozzle; and a step of ejecting the solidified liquid from the solidified material liquid ejecting nozzle toward the ground plate and gradually pulling it up from the borehole monitor. According to the present invention, when the drilling is performed and when the molten water is switched from the drilling water to the solidified liquid, the solidified liquid ejecting nozzle is plugged by the stopper by the stopper, thereby suppressing the useless discharge from the solidified liquid ejecting nozzle during drilling. The drilling water can also prevent the groundwater pressure from entering the solidified material liquid injection nozzle when the drilling is completed and switching from the drilling water to the solidified liquid, thereby improving the drilling efficiency and having high efficiency. Economically carry out the effects of site improvement and the like. [Embodiment] The first (a) and (b) diagrams show the front end portion of the self-drilling monitor attached to the front end of the injection pipe rod, and the second (a) (b) diagram shows the self-drilling monitoring. The solidified liquid spray nozzle of the device and the stopper for the monitor. In the figure, a miner bit 3 and a borehole water jet nozzle 4 are provided at the lower end portion of the monitor main body, and a solidified material liquid ejecting nozzle 5 and a compressed air jet nozzle 6 are provided at the side. Further, the monitor main body is provided with a liquid pressure feed flow path 7 for pumping the drilling water and the solidified liquid, and an air pressure supply flow path 8 for compressing the compressed air: the liquid pressure feed flow path 7 is connected to the drilled hole The water jet nozzle 4 and the solidified material liquid jet nozzle 5 are both a flow path for pumping the drilling water and a flow path of the pumping solidified liquid to the -10- 201114986 flow path. The air pressure feed passage 8 is connected to the compressed air injection nozzle 6». The solidified liquid injection nozzle 5 and the compressed air injection nozzle 6 are arranged in a concentric shape, and a solidified material liquid spray nozzle 5 is provided on the inner side, and a compressed air injection is provided on the outer circumference thereof. Nozzle 6. Further, the solidified material liquid ejecting nozzle 5 is formed to have a predetermined length along the diameter direction of the monitor main body, and its front end is opened to the side surface of the monitor main body. Further, the inner diameter of the solidified material liquid ejecting nozzle 5 is formed to have a certain inner diameter which is the thinnest at a predetermined length in the front end portion 5a, and the inner end portion 5b is formed to have a certain inner diameter thicker than the front end portion 5a over a certain length, and The intermediate portion 5c between the front end portion 5a and the base end portion 5b is formed to be gradually thicker from the side of the front end portion 5a toward the side of the base end portion 5b. Further, in the thus-formed solidified material liquid ejecting nozzle 5, a stopper 10 for a monitor is attached. The monitor plug 10 is provided with a columnar portion 10a and a conical portion 10b each having a cross-sectional shape corresponding to the inner shape of the distal end portion 5a and the intermediate portion 5c of the solidified material liquid ejecting nozzle 5. The columnar portion 1A is a cylindrical shape forming a front end portion 5a into which the solidified material liquid ejecting nozzle 5 is inserted, and the conical portion 10b is a cone which forms an intermediate portion 5c into which the solidified material liquid ejecting nozzle 5 can be inserted. And any part is formed: when inserted into the front end portion 5a and the intermediate portion 5c of the solidified material liquid ejecting nozzle 5, it can be completely adhered to the front end portion 5a and the intermediate portion 5c of the solidified material liquid ejecting nozzle 5 Weekly. Further, the columnar portion 10a and the conical portion 10b are integrally formed using an elastic material such as rubber or plastic. In this configuration, when the injection pipe rod 1 is inserted to a predetermined depth, it is -11 - 201114986, and the drilling water is pumped in the liquid pressure feed flow path 7 and is sprayed with high pressure from the drilling water injection nozzle 4 toward the ground plate. Drilling water, thereby cutting the ground plate, enables the injection pipe rod 1 to be inserted to a predetermined depth. At this time, in particular, the solidified material liquid ejecting nozzle 5 is completely plugged by the stopper 1 〇, so that unnecessary drilling water is not discharged from the solidified material liquid ejecting nozzle 5, and the drilling can be performed extremely efficiently without causing Release useless drilling water. In this case, the water supply pressure pumped in the liquid pressure feed passage 7 has a water supply pressure of about 2 MPa acting on the inner side of the monitor plug 10, but the conical portion of the stopper 1 is used for the monitor. Since the outer peripheral surface of the 〇b is formed into a tapered surface which gradually becomes smaller toward the distal end direction of the solidified material liquid ejecting nozzle 5, the stopper 10 for the monitor is not easily pushed out of the solidified liquid ejecting nozzle 5 by the water supply pressure of the drilling water. Further, the hydrostatic pressure P1 from the external groundwater acts on the monitor plug 10 inward, since the area s 1 of the inner end surface of the conical portion 10b is larger than the area S2 of the outer end surface of the column portion 10a. Larger, the force acting outward from the inside of the nozzle 5 on the monitor plug 10 is greater than the inward force acting on the monitor plug 10 from the outside of the nozzle 5. Therefore, even if the inside of the nozzle 5 is temporarily decompressed when switching from the drilling water to the solidified liquid, the stopper 1 is not pushed into the inside of the nozzle 5, and the soil or the like can be prevented from entering the nozzle 5. The nozzle 5 is blocked. In this case, the outer diameter of the columnar portion 1 〇a of the stopper 1 can be made larger than the inner diameter of the front end portion 5a of the solidified material liquid spray nozzle 5 by a little -12 - 201114986, or the column can be appropriately changed. The frictional force between the outer peripheral surface of the diameter portion 10a of the portion 10a and the inner peripheral surface of the solidified material liquid ejecting nozzle 5, thereby adjusting the resistance inward, on the other hand, when the solidified material is sprayed toward the ground disc, it is in the liquid After the water-stopping ball injection nozzle 4 is inserted into the pressure-feeding flow path 7, the liquid-pressure-feeding flow path 7 is a solidified material liquid, and is superimposed from the solidified material liquid ejecting nozzle 5 and is attached to the solidified material liquid ejecting nozzle 5 for monitoring. The injection pressure of the solidified liquid is pushed out, and the ground is improved in the ground. In this case, by the liquid pressure feed path 7, there is a very large injection pressure of 1 Torr of 10 to 40 MPa, and the stopper 1 〇 of the monitor is generated outside the shrinkage liquid spray nozzle 5. Further, by changing the area S 1 of the inner end surface of the long conical portion 1 〇b of the conical portion 1 〇b, the monitor plunger is pushed outward when the ejection pressure of the liquid is pushed out. Next, the installation of the monitoring hole using the present invention will be described. The monitor is subjected to a high-pressure jet mixing method. (1) First, in the solidified material liquid spray nozzle plug 1 〇. In this case, the solidified material liquid jet squirting method is detachably attached to the monitor main body, and the pressure of the columnar front end portion 5a is appropriately adjusted from the rear after the ejection nozzle 5 is detached from the monitor main body. P1's resistance fluid is used to improve the ground plate 9 to plug the drilling water spray instead of the drilling water and pressurize the pressure to spray the solidified liquid. The measuring device uses the plug 1 to apply the solidified liquid to the solidified liquid. The monitor is pushed out of the solidified material L1 by a plug shape and appropriately adapted to adjust the resistance of the solidified material 10. The self-drilling sequence of the plug with the plug. 5 Mounting the monitor for the I 5 is usually screwed. This can be used to spray the solidified liquid. Insert the monitor into the nozzle 5 with the plug -13- 201114986 10 to install it. (2) Next, the self-drilling monitor 2 to which the monitor plug 1 is attached is attached to the front end portion of the injection pipe rod 1. Then, in the liquid pressure feed flow path 7 in the self-drilling monitor 2, the drilling water is pressure-fed from the underground via the injection pipe rod 1, and the self-drilling monitor 2 is rotated together with the injection pipe rod 1. Push into the ground for drilling. Further, the compressed air injection nozzle 6 is preferably plugged by a sealing member, a cover or the like (which can be removed by compressed air ejected from the nozzle 6) in order to prevent clogging due to entry of soil or the like in the borehole. Further, such a sealing member or cover is attached to the stopper 10 for the monitor, and it can be removed together with the stopper by the ejection pressure of the solidified liquid. (3) When the drilling is performed to the depth of the plan, the water stop ball 9 is inserted into the liquid pressure feed passage 7 in the self-drilling monitor 2 to plug the bore water jet nozzle 4. (4) Next, in the liquid pressure feed flow path 7 in the self-drilling monitor 2, the solidified material liquid is pressure-fed from the ground via the injection pipe rod 1, and the solidified material liquid is sprayed into the nozzle 5 by the injection pressure of the solidified material liquid. The monitor pushes the outside of the nozzle 5 with the plug 10 to open the nozzle 5. (5) Next, the solidified material liquid is pressure-fed in the liquid pressure feed flow path 7 in the self-drilling monitor 2, and compressed air is pressure-fed in the compressed air flow path 8, whereby the solidified liquid liquid is sprayed from the nozzle 5 to a high pressure. The solidified liquid is sprayed, and compressed air is injected from the compressed air injection nozzle 6 at a high pressure. Further, at the same time, the self-drilling monitor 2 is gradually pulled up together with the injection pipe rod 1 around the -14, 2011, 14986 axis, and is formed by cutting soil and solidified liquid around the injection pipe rod 1. Site improvement body A. The self-drilling monitor and the high-pressure jet mixing method provided by the invention can prevent useless drilling water from being discharged from the solidified material liquid spraying nozzle during drilling, thereby improving drilling efficiency and reducing drilling water loss. [Simple diagram of the drawing] Fig. 1 shows the front end portion of the self-drilling monitor; Fig. 1(a) shows a longitudinal sectional view of the state in which the monitor plug is used to spray the drilling water; 1(b) The figure shows a longitudinal cross-sectional view of a state in which the monitor is pushed out with a stopper to eject the solidified liquid. Fig. 2 is a longitudinal sectional view showing a state in which a stopper for a monitor is mounted, and Fig. 2(b) is a longitudinal sectional view showing a state before a stopper for a monitor is mounted; . The third (a) to (d) diagrams are the construction sequence using the high pressure jet mixing method of the self-drilling monitor. Figure 4 shows the front end of the self-drilling monitor; Figure 4(a) shows a longitudinal section of the state of the jetted water, and Figure 4(b) shows the longitudinal section of the state of the sprayed solidified liquid. Figure. [Main component symbol description] 1 : Injection pipe rod 2 : Self-drilling monitor 3 : Boring drill bit -15- 201114986 4 : Drilling water jet nozzle 5 : Solidified material liquid spray nozzle 6 : Compressed air spray nozzle 7 : Liquid pressure Delivery flow path 8: Compressed air pressure supply flow path 9: Water stop ball 1 〇: Monitor plug l〇a: Columnar part l〇b: Conical part A: Site improvement body-16