C6 D6 210371 五、創作説明 (請先閲讀背面之注意事項存蜞寫本頁) 本發明傜一種挖掘工法及裝置，其傜與地盤之挖掘工 法有關，以各種打擊式费機（Percussion Drill Machines),尤其與所諝「使用左牙潛孔鎚」（以下簡稱 DTH)之控掘工法及其所用之裝置有關。 (先前之技術） 對於挖掘地盤，已往，較軟的地盤或岩盤（以下表示 地盤時，在本明細書中乃意味著包含岩盤）乃使用外套管 鑽頭（Ringbit )及内捍鑽頭（inner bit)亦即有時會 使用所謂「雙重管方式」。另外，硬質地盤之挖掘作業， 則使用潛孔槌（D T Η )的情形較多。 上述，雙重管方式則於圔5表示其概要。在管狀的外 套管（Casing) 1之先端部設有圓環狀之挖掘套管鑽頭2 (R i n g b i t)。而且在插入於外套管1之内側的内鑽桿（ innerrod) 3之先端部設有内桿鑽頭4,而該内桿鑽頭4 乃位於套管鑽頭2之内側。於是，套管1及内鑽桿3之鑽 頭則於相反側之端部設有接頭（adapter ) 5,並連接於 未圖示之頂鎚或動力源。 經濟部中央標準局R工消费合作社印製 另外，有關潛孔鎚（DTH )之結構及其使用工法 ，如圖6〜9所示。如眾所周知，D T Η乃藉氣動朽連績 性打擊傳達給先端之鑽頭，並挖掘著地盤予進行。DTH 之構造如圖6所示，而整個以符號10所示的DTH,乃 包含具有外殼機能而具有耐久性之外筒1 1,鑽頭12, 與支持鑽頭1 2之鑽軋頭（chuck ) 1 3 ,以及可産生連 續性打擊之氣動活塞（Air piston ) 1 4 ,以及將氣動 -2 - 82.3. 20,000 本紙張尺度適用中國國家標準（CNS>甲4规格（210 X 297公釐） 經C6 D6 210371 5. Creation instructions (please read the precautions on the back to write this page first) The present invention is a kind of excavation method and device, which is related to the excavation method of the site, with various impact drilling machines (Percussion Drill Machines) In particular, it is related to the controlled excavation method of "using left tooth DTH hammer" (hereinafter referred to as DTH) and the device used. (Previous technology) For the excavation site, the past, the softer site or rock site (hereinafter referred to as the site, in this specification is meant to include the rock site) is the use of outer casing bit (Ringbit) and inner bit (inner bit) In other words, the so-called "dual tube method" is sometimes used. In addition, in the excavation of hard disks, it is often the case that DTH hammers (D T Η) are used. As mentioned above, the dual-tube method shows its outline in U5. At the front end of the tubular outer casing (Casing) 1, an annular excavating casing bit 2 (R i n g b i t) is provided. In addition, an inner rod bit 4 is provided at the front end portion of the inner rod 3 inserted inside the outer sleeve 1, and the inner rod bit 4 is located inside the casing bit 2. Therefore, the drill bits of the casing 1 and the inner drill rod 3 are provided with adapters 5 at the opposite ends, and are connected to a top hammer or power source (not shown). Printed by the R Industry and Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. In addition, the structure of the DTH hammer and its use method are shown in Figures 6-9. As is known to all, D T Η is conveyed to the cutting-edge drill bit by aerodynamic continuous attack, and excavation is carried out. The structure of the DTH is shown in FIG. 6, and the entire DTH shown by symbol 10 includes the outer barrel 1 with a shell function and durability, a drill bit 12, and a chuck 1 supporting the drill bit 1 3, and the air piston (Air piston) that can produce a continuous blow 1 4 and the pneumatic -2-82.3. 20,000 This paper scale is applicable to the Chinese national standard (CNS> A 4 specifications (210 X 297 mm)
I 消 費 合 作 社 印 五、創作説明 C6 D6 活塞14之打擊傳逹至纘頭12而且具有將打擊傳連方向 適當正確加以引導之機能的導具15等。 如圖8所示，DTH10可插入於套管（casing)20 中使用，這時，DTH10可與套管20同時挖堀進入地 盤中。 在此，D T Η所用之鑽頭則不限於圖6、7所示者。 圖8則使用可擴大挖掘孔徑的鑽頭（擴孔鑽頭）22 。擴孔鑽頭2 2具有如圖9詳示之構造，只要將引導鑽頭 (Pilot bit)23 與鑽頭擴孔錐（Excent,ric reamer ) 2 4之相對位置加以變位，即可增減以尖端（t i p )挖掘 之孔徑。這時，套管20乃與擴孔鑽頭22之偏心擴張率 成比例而使用肉薄的直線管（straight pipe)(瓦斯管 等構造用鋼管）。理由是在套管2 0之内側（内徑）的有 限領域内要插入DTH 1 0及擴孔鑽頭2 2以肉厚較薄的 較理想，以及擴孔鑽頭會比套管之外徑更擴大所以套管不 會有軸方向載重之負荷等。而且，隨著挖掘深度之增加， 刖有於内部形成氣動活塞驅動用之壓编空氣的供給路17 之延長零件18 (圖7)，螺合於DTH之上部β隨著穿 孔之深度愈深，連同柱腳（Shoe) 2 7之端部2 8之接合 ，隨箸DTH10,套管20本身會向地中鑽進。在此， 套管2 0之連接，乃在地面上焊接新的套管。又壓住相對 岩盤之硬度而加以測定故具有可自立之強度，此乃使已往 DTH規格条統更好使用。 (本發明欲解決的問題） 本紙張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） 82.3. 20,000 請 先 閲 面 之 注 意 事 项 再 填 本 頁 裝 訂I Consumer Cooperation Press Print 5. Creation Instructions C6 D6 The impact of the piston 14 is transmitted to the head 12 and the guide 15 has the function of properly and correctly guiding the direction of the impact transmission. As shown in FIG. 8, the DTH 10 can be inserted into the casing 20 and used. At this time, the DTH 10 and the casing 20 can be dug into the ground at the same time. Here, the bits used for D T Η are not limited to those shown in FIGS. 6 and 7. Fig. 8 uses a drill bit (reaming drill bit) 22 that can expand the digging hole diameter. The reaming bit 22 has the structure shown in detail in FIG. 9, as long as the relative position of the pilot bit 23 and the drill reaming cone (Excent, ric reamer) 2 4 is changed, the tip ( tip) Aperture for excavation. At this time, the casing 20 is a thin straight pipe (steel pipe for structural use such as a gas pipe) that is proportional to the eccentric expansion rate of the reamer 22. The reason is that in the limited area of the inside (inner diameter) of the casing 20, it is better to insert the DTH 1 0 and the reaming bit 2 2 with a thinner thickness, and the reaming bit will be larger than the outer diameter of the casing Therefore, the bushing will not be loaded by the axial load. Moreover, as the digging depth increases, there is an extension part 18 (FIG. 7) forming a supply path 17 of compressed air for driving the pneumatic piston inside, screwed on the upper part of the DTH, β becomes deeper with the depth of the perforation, Together with the engagement of the end 28 of the shoe foot 27, with the DTH 10, the casing 20 itself will drill into the ground. Here, the connection of the casing 20 is to weld a new casing on the ground. Also, the hardness of the relative rock disk is suppressed and measured, so it has a self-supporting strength, which makes the DTH specification system better used in the past. (Problems to be solved by the present invention) This paper scale is applicable to the Chinese National Standard (CNS) A4 specifications (210 X 297 mm) 82.3. 20,000 Please read the notes on the page first, and then fill out this page for binding
C6 D6C6 D6
2103V 五、創作説明 可是已往的雙重管方式，由於下述之理由，在挖掘岩 體受到限制，而且，為挖掘增加成本、時間及努力β 第一，在軟地盤中深孔被要求穿孔時，由於外套管與 地層之摩擦（jamming :擠塞）而鎖緊了該套管。於是地 面上的穿孔機械侧發生很多的轉矩（torque)，結果會發 生套管不得不埋入地中的事故。 第二，在硬岩地層之深孔被要求穿孔時，於使用穿孔 機械發生挖掘所需能源或轉矩之回轉及打擊機構（top hammer machine )之際，其在管之每一接合部會有數％ 之能源損失。為此，隨著挖掘深度之愈深，傳逹於先端之 挖掘鑽頭的打擊力即減少，挖掘動作檝弱，挖掘速度顯著 變慢。 另外，以習知之DTH時刖由地面壓送壓编空氣而使 纘頭隨時在動作，而且，管接合部中並無打擊力損失之問 題。為此，比起藉回轉、打擊機（t 〇 p h a m πι e r)予傳達 打擊力之挖掘糸統，可加速穿孔速度《可是DΤΗ時有下 述之問題。 第一，於DTH時也因岩質（例如多孔質岩盤等）而 無法動作。 第二，DTH無法使用於軟質地盤。DTH之特性是 ，其鑽頭乃對挖掘之岩體經壓縮空氣而隨時接觸（箸岩） 且被推住，壓縮空氣即由鑽頭與硬岩質體之間遁逸，並由 於該遁逸空氣之撞回而使細泥（Slime )上揚。於是利用 對硬岩質體之壓縮空氣之反撥力予進行鑽頭之動作。可是 ~ 4 - 本紙張尺度適用中國國家摞準（CNS)甲4規格（210 X 297公| ) (請先閲讀背面之注意事項再蜞寫本頁) -裝. 訂. 經濟部中央標準局S工消费合作社印* 82.3. 20,0002103V 5. The description of the creation is a double pipe method in the past. Due to the following reasons, the excavation of the rock mass is restricted, and the cost, time and effort are increased for the excavation. The casing was locked due to the friction (jamming) between the outer casing and the formation. As a result, a lot of torque occurs on the machine side of the piercing machine, and as a result, the casing has to be buried in the ground. Second, when deep holes in hard rock formations are required to be perforated, there will be a number of joints at each junction of the pipe when the perforation machine is used to generate the rotation or top hammer machine for the energy or torque required for excavation. % Energy loss. For this reason, as the digging depth becomes deeper, the impact force of the digging drill bit transmitted to the tip decreases, the digging action is weak, and the digging speed becomes significantly slower. In addition, with the conventional DTH, the compressed air is sent from the ground to make the head move at any time, and there is no problem of impact force loss in the pipe joint. For this reason, compared to the excavation system that conveys the striking force by the rotary and striking machine (t o p h a m πι e r), the piercing speed can be accelerated. "DHT has the following problems. First, it cannot be operated due to rock quality (such as porous rock disks) during DTH. Second, DTH cannot be used on soft texture disks. The characteristic of DTH is that the drill bit is in contact with the excavated rock mass at any time by the compressed air (dust rock) and pushed, the compressed air escapes between the drill bit and the hard rock body, and due to the escape air Crash back and make the slime (Slime) rise. Therefore, the backlash of the compressed air against the hard rock mass is used to perform the action of the drill bit. But ~ 4-This paper size is suitable for China National Standard (CNS) Grade 4 (210 X 297 gm |) (please read the precautions on the back before writing this page)-installed. Ordered. Central Bureau of Standards S Printed by industrial and consumer cooperatives * 82.3. 20,000
2l〇^!V C6 D6 經濟部中央揉準局員工消費合作社印製 五、創作説明 該挖的地盤為軟地盤時，穿孔之際由於岩體而失去壓缩空 氣之反撥力，鑽頭即被軟地盤絞住。於是由於壓縮空氣致 使阻力變異而大，鑽頭無法動作，無法作更多之挖掘。 使用擴孔鑽頭之工法中，在打椿工程或集排水工程等 由於必須由地中拔出外管，所以，在雙重管方式中存在著 與上述第一之問題相同的問題。又如前述在使用擴孔鑽頭 的工法中刖將肉薄的鋼管當箸外套管使用，所以如已往之 轉 top haffliaei' 的雙重管循環撞擊（Rotary percussion )方式中，對外管附加打擊扭力（Torque)時肉薄的套管 撐不住附加扭力而有毀潰之問題。 由於日本之地層偽複合地層佔大部份，軟地盤與硬地 盤交互積層。為此，己往藉top hammer時通常誤採用雙 重管循環撞擊的挖掘方式，或是否該採用迴轉式鑽機（Bo ring machine )中之DTH系統，實在難以選擇。尤其 是對於近來之要求深孔穿孔的傾向，或土木建設工程或都 市土木建築工程等之各種基椿工法、地滑防災工程之法面 定箸基椿工程，集排水工程等多方面的工程種類，或對新 開發的工程工法，以目前所限定的穿孔糸統，其適用實在 是極加困難。 接著，Η將已往的挖掘工法（例如藉top hammer之 雙重管循環撞擊条統，迴轉式鑽機之DΤΗ通常按鈕纘頭 規格条統、迴轉式鑽機之DTH擴孔鑽頭規格条統之三種 )使用於複合地層時之問題點列舉如下。在此，該複合地 層為軟地盤，並假設地中含有許多直徑3〜5 m之轉石。 -5 - (請先Η讀背面之注意事項再填寫本頁) .裝. 訂· 本纸張尺度適用中國國家標準（CNS)甲4規格（210 X 297公» ) 82.3. 20,000 210^ C6 D6 纒濟部中央標準局Λ工消费合作杜印製 五、創作説明 藉依top hammer之雙重管循環撞擊糸統作挖堀時， 由於這種狀況下的轉石是壓縮強度較高的（硬的）岩質， 所以僅藉内桿鑽頭之打擊能源是無法擊毀，必須以外套管 鑽頭邊切邊前進。於是，套管鑽頭之切削磨損及鑽頭柄部 (循體）的磨耗會更加顯著。若欲加速穿孔速度則在套管 鑽頭發生所需以上之轉矩，故要到達定箸岩體為止就得使 換數次鑽頭，而且發生所需以上之轉矩，將成為撞鎚的故 障原因。 上述套管鑽頭之更換作業乃由拔出套管作業開始，換 好鑽頭再開始挖掘時，由於轉石間之軟地盤（破碎帶成餘 地（room)層等）之壓縮作用，拔上套管後之穿孔口會被 回墊（崩孔）。這時，藉t〇P hamnier之雙重管循環撞擊 糸統之特性是，隨箸挖堀孔之深度愈深，該孔即發生彎曲 ,致使中途在挖掘新孔之可能性極大。而且這種新孔之挖 掘會在套管鑽頭之更換作業時反覆實施，形成耗費勞力至 巨，且技術性的困難也會增加。 藉迴轉式纘機之D Τ Η通常按铤鑽頭規格条統做挖掘 時，設若上述為軟地盤時，壓编空氣不會遁逸而鑽頭亦失 去反撥力，鑽頭之動作變鈍，先端部引起所謂之擠塞（ Jamming )而變成不動。又DTH在其自重無法雒持其作 用之方向為挖堀方向之狀況，亦即在不能自立之狀況時， D T Η就無法做單管穿孔。 藉迴轉式鑽機而依D Τ Η擴孔鑽頭規格糸統做挖掘時 ，例如與上迷假設之地層相同時，每一挖掘孔就需要挖掘 -6 - (請先閲讀背面之注意事項再蜞寫本頁) -裝- 訂. 砵· 本紙張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） 82.3. 20,000 經濟部中央標準局R工消费合作社印製 210^'Vl C6 ___D6_ 五、創作説明 深度份量的管，於實際施工時需要後數之挖堀孔，所以成 本就偏高而不贲用β由於管本身肉薄，目前管都以焊接加 以連接。管的接合部也可以考慮作螺絲加工，但無法讓該 接合部具有能撐得住抽取扭力之強度。又於基椿工程中是 不能將管殘留於地中，但是把長幾十公尺的套管拉上地面 也是不可能的一件事。 本發明乃鑑於上述已往技術之問題而加以提案者，即 使是硬地盤或軟地盤均能適當的加以挖掘，垂直方向以外 的方向亦能進行硬地盤的挖堀，不會把管子埋入而不管， 可加速深孔之穿孔速度的挖掘工法以及提供其實施之挖掘 装置為其目的。 (解決問題的手段） 本發明之挖掘方法，乃包含對裝有外套管挖掘鑽頭的 管内側先端插入連接有左牙潛孔鎚（DTH)之捍（Rod )的左牙D T Η的挖掘工程；以及將裝有内桿鑽頭的桿與 連接有D Τ Η的桿更換而由内桿鑽頭予挖掘工程。 實施本發明之挖掘工法時，最好在DTH之先端設有 擴孔鑽頭較佳。 又本發明之挖掘方法，則包含依藉左牙潛孔鎚（DT Η)之挖掘工程及套管鑽頭（ring bit )予以挖掘之工 程，加上由挖掘之孔抽取DTH之工程，以及回轉著套管 鑽頭予抽出之工程等較佳》 又，為了實施本發明之上述挖掘工法的挖掘裝置，包 含有可更換裝有圓環狀之挖掘鑽頭的管子，以及插入於該 7 — (請先«讀背面之注意事項再填寫本頁) .裝. 訂. ♦·. 本紙張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） 82.3. 20,000 C6 D6 21〇^ 五、創作説明 管子之内倒的桿，以及連接於該桿之先端的左牙潛孔鎚（ DTH)，以及連接於DTH前端的桿，和另一在其先端 裝有内桿鑽頭的桿等。 實施本發明時，圓環狀之套管鑽頭可傳達回轉或衝擊 力之回轉、打擊機（top hammer),以及左牙DTH之雙 方，以具有同一方向之螺絲部，而依單一之地上設備予以 驅動者較佳。 又於D T Η不如在地上侧之位置，例如在連接於 DT Η之伸長捍（extension rod),可設置會傳達回轉 力但會遮斷軸方向推力（thi-ust )之結合（joint )零件 。套管鑽頭除了回轉力之外必須要有推力，但D T Η則無 由外部付與推力之必要，所以對D Τ Η作用之推力，有時 亦有遮斷較為理想的情形。 又，藉D Τ Η予挖掘之工程，以及藉套管鑽頭予挖掘 之工程可同時進行，分開進行亦可。視該挖掘地盤之狀態 可做適當選擇。 在本發明中，對於裝有圓環狀之挖掘鑽頭的管子供給 挖掘所需動力之能源傳逹源，在地面上則以top hammer (回轉、打擊機構）較為理想。 (作用） 若藉具有上述構成之本發明，即使軟地盤與硬地盤交 互積層時，每當變更地盤亦不必更換挖掘設備，以同一挖 掘設備即可做挖堀作業《於是，大幅減低挖掘作業之勞力 或成本。又，朝垂直方向以外之方向挖掘時，裝有套管鎮 -8 - 本紙張尺度適用中as家標準（CNS)甲4规格（210 X 297公藿） (請先閲3面之注意事項再填寫本頁) —裝· 訂· 經濟部中央樣準局員工消費合作社印製 82.3. 20,000 210^ C6 D6 五、創作説明 頭的管子會做左牙DTH之引導作用，所以DTH對於重 力作用方向（垂直方向）以外亦可正確的進行挖掘。於是 己往的技術是，垂直方向以外之方向之挖掘，軟地盤則僅 靠雙重管方式來實施，本發明中由於可使用左牙DTH, 所以硬地盤也可以挖堀垂直方向以外之方向。挖掘完了後 要拔出挖掘機材時，只要回轉著套管鑽頭向地上倒拉，該 套管鑽頭即可輕易拔出。結果，插入DTH之部份材料（ 套管（Casing Pipe)及鑽頭）也就不必埋棄，所以基椿 工法中當然可採用依本發明之挖掘工法。 就這樣，若依本發明，不僅是基椿工程，尚可轉用於 集排水工程，水平長孔之穿孔，大口徑工程，打椿工程等 之領域，而在這些工程之施工可望獲得很大的優點。 亦即採用本發明時，至定箸岩體附近例如依top hammer之雙重管雙撞擊DTH規格之挖掘鑽頭（或擴徑鑽 頭）向前挖，所以比起通常之使用雙重管循環撞擊予挖掘 時，挖掘孔之彎曲較少。尤其是仿用擴孔鑽頭時，套管與 地層之間隔可以取大一些，於是使得地層所致之磨擦阻力 減少，可防止該挖地層之壓縮力所致的外管之回轉或軸方 向之移動變成不可能的事態（擠塞）。於是，安全而且確 實的至定著地點附近為止可以鑽頭尖端進行挖掘^ 經濟部中央標準局典工消費合作杜印製 挖堀至定著地點附近之後，DTH則随著内桿鑽頭之 拔起而-被拔至地面上。又欲拔起擴孔鑽頭時，應於拔起内 桿鑽頭之前將擊鎚做逆回轉而把被擴孔之鑽頭務須收藏於 套管内側。 82.3. 20,000 (請先閲面之注意事項再蜞寫本頁) ·—裝_ i- 本紙張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） 210^ C6 D6 «濟部中央標準局w工消费合作杜印製 五、創作説明 拔出内鑽捍時套管依然是置於地中，但於其先端則裝 有與地層相對的經由選擇之挖掘纘頭（套管纘頭）^而且 被拔至地上的左牙DTH (或擴孔鑽頭），乃在雙重管循 環撞擊条統裝上被認為最適合該地層之挖掘潑頭（内桿鑽 頭），再度插入於挖堀孔之最先端，至所定之定箸深度止 當著回轉打擊条統（top hammeiO而進行挖堀。當然，僅以 套管單管亦可藉top hammer做挖掘 上述是雙重管回轉打擊糸統（top hammer)與左牙D Τ Η条統併用之說明，但本發明則於須使用雙重管雙擊糸统 時亦可實施。亦即若藉本發明，可將雙重管回轉打擊条統 及雙重管雙撞擊糸統之雙方使用同一挖掘設備加以施工。 因此，穿孔作業中大幅的減低勞力及成本。又將使用左牙 DT Η糸統及Top hammer之挖掘糸統加以併用，也能盡 量防止挖掘孔之孔嫌曲，結果，減輕了附加於套管之摩擦 〇 (實施例） 以下，主要參照圖1〜4 ,將本發明之實施例說明如 下： 圖一表示實施本發明之挖掘工法的挖掘設備之主要部 份。整體以記號（5 0 )表示之挖掘設備，乃具有套管亦 即管狀之套管（5 2),以及螺合於其先端部之圓環狀的 套管鑽頭（環鑽）（5 4 )。而且在套管（5 2 )之内側 插入有左牙空氣式潜孔鍵（Down the hole hammer, 簡稱DTH) (5 6)，而在左牙潛孔鎚（56)之先端 -10 - (請先閲讀背面之注意事項再蜞寫本頁) •—裝_ 訂. 0·- 本紙張又度適用中國國家標準（CNS)甲4規格（210 X 297 «货） 82.3. 20,000 C6 D62l〇 ^! V C6 D6 Printed by the Employee Consumer Cooperative of the Central Bureau of Economic Development of the Ministry of Economic Affairs 5. When the site was dug to be a soft site, the backlash of compressed air was lost due to the rock mass during the perforation, and the drill bit was taken by the soft site Strangle. As a result, the resistance changes due to the compressed air, the drill bit cannot move, and no more excavation is possible. In the construction method using the reamer bit, the outer pipe must be pulled out from the ground in the demolition works, the drainage works, etc. Therefore, the double pipe method has the same problem as the first problem mentioned above. Also as mentioned above, in the construction method using the reamer bit, the thin-thick steel pipe is used as the clad outer sleeve, so as in the past, the double pipe cyclic impact (Rotary percussion) method of the top haffliaei 'is added, and the external pipe is added with a torsional torque (Torque) Sometimes the thin casing cannot bear the additional torsion and has the problem of collapse. Since the formation of pseudo-composite formations in Japan accounts for the majority, soft and hard constructions are alternately stacked. For this reason, it is often difficult to choose the DTH system in the rotary drill (Bo ring machine) when the top hammer is used in the past, when the double-pipe cyclic impact excavation method is wrongly used. Especially for the recent tendency to require deep hole perforation, or various types of foundation construction methods such as civil construction engineering or urban civil construction engineering, ground surface disaster prevention engineering, and the various types of engineering such as foundation foundation engineering, drainage engineering, etc. Or, for the newly developed engineering method, with the currently defined perforation system, its application is extremely difficult. Then, Η used the previous excavation methods (for example, the top hammer of the double pipe cycle impact system, the DTH of the rotary drilling rig is usually the button button specification system, and the DTH reaming drill specifications of the rotary drilling machine are three types). The problems in compound formation are listed below. Here, the composite stratum is a soft ground, and it is assumed that the ground contains many turning stones with a diameter of 3 to 5 m. -5-(please read the precautions on the back before filling in this page). Binding. Ordered · This paper size is applicable to China National Standard (CNS) A 4 specifications (210 X 297 public ») 82.3. 20,000 210 ^ C6 D6 Printed by Du Ji, Central Bureau of Standards, Ministry of Economic Affairs and Industry Cooperative Printing 5. Creation instructions When the double hammer is recycled by the top hammer to hit the tongs for digging, because the turning stone under this condition is of higher compressive strength (hard ) Rock quality, so it can not be destroyed by the striking energy of the inner rod bit, and the outer casing bit must be cut forward. Therefore, the cutting wear of the casing bit and the wear of the bit shank (circulatory body) will be more significant. If you want to accelerate the piercing speed, more than the required torque will occur in the casing bit, so you have to change the bit several times before reaching the Dingchen rock body, and the more than required torque will be the cause of the failure of the hammer . The above-mentioned casing bit replacement operation is started by the operation of pulling out the casing. When the drill is replaced and the excavation starts, the casing is pulled out due to the compression effect of the soft ground between the stones (the broken zone becomes the room layer, etc.) After the perforation will be backed (cracking). At this time, the characteristic of the mitochondria by the double pipe of t〇P hamnier is that as the depth of the hole is deeper, the hole will bend, which makes the possibility of digging a new hole halfway. Moreover, the excavation of this new hole will be carried out repeatedly during the replacement operation of the casing bit, which will be extremely labor intensive and the technical difficulties will also increase. The D Τ Η by rotary reeling machine is usually excavated according to the specifications of the collar drill bit. If the above is a soft site, the compressed air will not escape and the drill bit will also lose the backlash. The so-called jamming becomes immobile. In addition, DTH cannot make a single tube perforation when its own weight cannot hold its direction in the direction of digging, that is, when it cannot stand on its own. When digging according to the D HT reaming bit specification system with a rotary drilling rig, such as the same stratum as assumed by the above fan, each excavation hole needs to be excavated -6-(please read the precautions on the back before writing This page) -installed-ordered. 砵 · The paper size is in accordance with Chinese National Standard (CNS) A4 specifications (210 X 297 mm) 82.3. 20,000 Printed by R & C Cooperative, Central Bureau of Standards, Ministry of Economic Affairs 210 ^ 'Vl C6 ___D6_ Fifth, the creation description of the depth of the weight of the tube, the actual construction requires the next digging hole, so the cost is too high to use β Because the tube itself is thin, the current tube is connected by welding. The joint of the pipe can also be considered to be screwed, but the joint cannot be made strong enough to withstand the extraction torque. In the foundation project, it is impossible to leave the pipe in the ground, but it is also impossible to pull the casing of tens of meters in length to the ground. The present invention is proposed in view of the above-mentioned problems of the prior art. Even hard or soft ground can be dug appropriately, and the hard ground can be dug in a direction other than the vertical direction, and the pipe will not be buried regardless of , The excavation method that can accelerate the perforation speed of deep holes and the excavation device to provide its implementation are its purpose. (Means for solving the problem) The excavation method of the present invention includes the excavation project of inserting the left end DT Η of the left tooth DTH (Rod) connected to the left tooth DTH hammer (DTH) into the inner end of the tube equipped with the outer casing excavation bit; And the rod with the inner rod bit is replaced with the rod with the DHT connected, and the inner rod bit is used for excavation work. When implementing the excavation method of the present invention, it is preferable to provide a reamer at the tip of the DTH. In addition, the excavation method of the present invention includes the excavation process by the left-hand DTH hammer (DT Η) and the casing bit (ring bit), plus the process of extracting DTH from the excavated hole, and turning It is preferable that the casing bit is pre-extracted. "In addition, in order to implement the above-mentioned excavation method of the present invention, the excavation device includes a tube that can be replaced with a circular excavation bit, and is inserted into the 7- (please first «Read the precautions on the back and then fill out this page). Binding. Order. ♦ ·. This paper scale is applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) 82.3. 20,000 C6 D6 21〇 ^ 5. Creation Describe the rod that fell inside the tube, and the left-hand DTH hammer (DTH) attached to the tip of the rod, the rod attached to the front of the DTH, and another rod with an inner rod drill at its tip. When implementing the present invention, the circular casing drill bit can transmit the rotation or impact force of the rotation, top hammer, and the left tooth DTH, with a screw part having the same direction, and provided by a single ground equipment The driver is better. In addition, the D T Η is not as good as the ground. For example, in the extension rod connected to the DT Η, a joint part that can transmit the turning force but block the axial thrust (thi-ust) can be provided. The casing bit must have thrust in addition to the turning force, but D T Η is not necessary to give thrust from outside, so the thrust acting on D T Η may sometimes be more ideally blocked. In addition, the excavation works by D Τ Η and the excavation works by casing bits can be carried out simultaneously or separately. Depending on the state of the excavation site, appropriate selection can be made. In the present invention, it is ideal to use a top hammer (swivel, striking mechanism) on the ground for the energy transmission source for the pipe equipped with a ring-shaped excavation bit to supply the power required for excavation. (Function) With the present invention having the above-mentioned configuration, even when the soft site and the hard site are alternately stacked, it is not necessary to replace the excavation equipment whenever the site is changed, and the same excavation equipment can be used to perform the excavation operation. Therefore, the excavation operation is greatly reduced Labor or cost. In addition, when digging in a direction other than the vertical direction, the casing is installed Zhen-8-This paper size is applicable to the Chinese standard (CNS) A 4 specifications (210 X 297 common potion) (please read the precautions on 3 sides first) (Fill in this page) — Installation · Ordering · Printed by the Staff Consumer Cooperative of the Central Prototype Bureau of the Ministry of Economic Affairs 82.3. 20,000 210 ^ C6 D6 5. The tube of the creative description head will guide the DTH of the left tooth, so the direction of DTH's effect on gravity ( Vertical direction) can also be excavated correctly. Therefore, the conventional technology is to excavate in directions other than the vertical direction, and the soft ground is only implemented by the double pipe method. In the present invention, since the left tooth DTH can be used, the hard ground can also dig in directions other than the vertical direction. When the excavator material is to be pulled out after digging, as long as the casing bit is turned back to the ground, the casing bit can be easily pulled out. As a result, some materials (casing pipe and drill bit) inserted into the DTH need not be buried, so the excavation method according to the present invention can of course be used in the foundation method. In this way, according to the present invention, not only the foundation engineering but also the drainage and drainage engineering, the perforation of horizontal long holes, large-diameter engineering, and construction engineering, etc., and the construction of these projects is expected to achieve great The big advantage. That is to say, when adopting the present invention, to the vicinity of the debris rock body, for example, the double-pipe double impact DTH digging drill bit (or expanded diameter drill bit) according to the top hammer digs forward, so compared to the usual double pipe cyclic impact for excavation , Less bending in the excavation hole. Especially when imitating a reamer bit, the distance between the casing and the formation can be made larger, so that the friction resistance caused by the formation is reduced, which can prevent the rotation of the outer tube or the movement of the axis direction caused by the compressive force of the excavation Into an impossible state of affairs (congestion). Therefore, it is safe and reliable to excavate the tip of the drill bit up to the fixed point ^ After the Ministry of Economic Affairs, the Central Standard Bureau of the Ministry of Industry and Consumer Affairs du printed the excavation near the fixed point, DTH followed the pulling of the inner rod bit. -Was pulled to the ground. If you want to pull out the reamer bit, you should reverse the hammer before pulling up the inner rod bit and store the reamer bit in the casing. 82.3. 20,000 (please read the precautions first and then write this page) · —install _ i- This paper scale is applicable to China National Standard (CNS) A 4 specifications (210 X 297 mm) 210 ^ C6 D6 «Jib Du Printing by the Central Standards Bureau and Industry and Consumer Cooperation V. Creation instructions The casing is still placed in the ground when the inner drill is pulled out, but at its front end is equipped with a selective excavation head (casing reel) opposite to the stratum Head) ^ and the left tooth DTH (or reamer bit) that was pulled to the ground was installed on the double pipe circulation impact strip that was considered to be the most suitable excavation splash head (inner rod bit) for the formation, and was inserted into the excavation again At the very beginning of the hole, to the fixed depth of the set, the top hammeiO is used to dig the hob. Of course, only the single pipe of the casing can also be used to dig by the top hammer. The above is the double-pipe rotary hammer system ( top hammer) is used in conjunction with the left tooth D Τ Η system, but the present invention can also be implemented when the double tube double-click the system must be used. That is, if the invention is used, the double tube can be turned to strike the system and the double tube Both sides of the double impact system use the same excavation equipment for construction. As a result, labor and cost are greatly reduced during the piercing operation. The left-hand DT Η 糸 system and the Top hammer excavation system are used together to prevent the hole from being excavated as much as possible. As a result, the attachment to the casing is reduced Friction 〇 (Example) Hereinafter, referring mainly to FIGS. 1 to 4, the embodiment of the present invention will be described as follows: FIG. 1 shows the main part of the excavation equipment implementing the excavation method of the present invention. The whole is represented by the symbol (50) The excavation equipment is a casing (5 2) which is a casing, which is a tube, and an annular casing drill bit (ring drill) (5 4) screwed to its front end. Also in the casing (5 2 ) Is inserted inside the left tooth DTH key (DTH) (5 6), and at the tip of the left tooth DTH hammer (56) -10-(please read the notes on the back first Write this page) • —Binding _ Order. 0 ·-This paper is again applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 «goods) 82.3. 20,000 C6 D6
Si〇^v Α、創作説明 部設有DTH鑽頭（58)。在此，開始挖掘時，DTH 鑽頭（58)乃比套管鑽頭（54)先行而突出β 與套管（52)及左牙潛孔鎚（56)之鑽頭相反倒 的端部設有承接管（Adapter ) (60)。這承接管（6 〇)表示包括有各種杯型接頭（cupring > ( 6 6 )，輪 軸（Swivel) (6 8)等，而連接於未圖示之回轉、打擊 糸統（top hammer)及動力源。 圖二則明確的表現包括於圖示中之承接管（60)的 構成零件》左牙潛孔鎚（56)連接於内鑽桿（55)， 而内鑽捍（5 5)則連接於伸長桿（extension rod ) (6 2) ^在此，該捍（6 2)之内部構成有壓缩空氣通 路（6 4 ) 0 另外，套管（5 2 )乃介由杯型接頭（6 6 )螺合於 淨化承接管（Cleaning adapter ) (7 2.)。在此，上 述伸長桿（6 2 )乃插入於淨化承接管（7 2 )内。而且 ，i#化輪軸（6 8 )則裝箸於淨化承接管（7 2 )之外倒 Ο 在淨化輪軸（6 8 )形成有壓縮空氣供給口 （ 7 0 ) ，而D T Η驅動用之壓縮空氣乃經由該供給口 （7〇)、 通路（64)供給與左牙潛孔鎚DTH (56)。又，淨 化輪軸（6 8 )乃介由淨化承接管（7 2 )而被連接於柄 桿（Shankrod) ( 7 4 ),而該捍（7 4 )則連接於未圖 示之top hammer。又，圖二中之記號（7 6)則表示襯 墊壓片。由top hammer傳達來的輪軸及回轉力，乃經由柄 -11 - ----1'·1'--------Γ-------装------訂-----C 咏 (請先《讀背面之注意事項再填寫本頁) 鹾濟部中央標準局A工消费合作社印製 本紙張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） 82.3. 20,000 210^1 C6 D6 經濟部中央揉準局MK工消费合作社印* 五、創作説明 桿（74)、淨化承接管（72)、杯型接頭（66)、 套管（52)，予傳逹於套管鑽頭（54)。 又，未圖示，但藉左牙潛孔鎚（56)之挖掘與套管 纘頭（5 4 )予挖堀之恰當時間（timming ),可經由調 配以進行最適當的挖握。而在地面上設置有例如未圖示之 top hammer及壓縮空氣供給機構之動作的控制機構。 又，為了驅動左牙潛孔鎚DTH (56)與套管鑽頭 (54)，於兩者與其他零件螺合的位置形成之螺絲部必 須為同一方向之螺絲。亦即同為右螺絲或均為左螺絲始可 。若一方為右螺絲而他方為左螺絲時，其中之任何一方乃 被螺絲解除其螺合，终至脱落。 挖掘地盤時，將未圖示之壓縮空氣供給機構（空氣暖 縮機）與top hammer大約同時加以動作，進行藉D T Η 之挖掘工程與套管鑽頭之挖掘工程。 對硬岩地盤，連接於套管（5 2)之内的内鑽捍（55 )的左牙潛孔鎚（5 6 )，其先端裝有Γ) Τ Η鑽頭（5 8 )。挖掘時，這D Τ Η鑽頭（5 8 )，隨時比套管鑽頭（ 54)先行幾分（突出）予以挖掘。 軟岩地盤存在於比硬岩地盤之深度更深的位置時，為 了防止事故導致之工具毀損，應立刻將内纘桿（5 5)拔 上地面，更換習知回轉打擊条統用之内桿鑽頭，對軟岩進 行穿孔。而當，使用DTH糸統時，其挖掘徑與更換為上 述内桿鑽頭後之挖堀徑將會成為同一徑。亦卽，DTΗ用 鑽頭（5 8 )與top hammer内之内捍鑽頭的鑽頭徑，其任 -12 - 本紙張尺度適用中Η國家標準（CNS>甲4規格（210 X 297公* ) 82.3. 20,000 (請先閱讀背面之注意事項再塡寫本頁) 裝. 訂' ."τ 緣！ 經濟部中央摞準场霣工消费合作社印製 gio^vi C6 _ _D6_ 五、創作説明 何一方都小於外管鑽頭（套管鑽頭（5 4))徑。而且， 這種糸統乃被稱為雙重管雙撞擊β 在圖三、四中，左牙潛孔鎚（56)之先端部，乃經 由引導裝置（guide device) (80)連接著擴孔鑽頭 (8 2 )。由淨化輪軸（6 8 )經由淨化承接管（7 2 ) 接受地上所供給之空氣，左牙潛孔鎚（56)乃於壓縮空 氣把能源傅逹於引導裝置（8 0 ),最後該能源乃使擴孔 鑽頭（8 2 )予動作，挖堀地中。使其偏心的纘頭之徑不 但是套管（52),應與套管纘頭（54)之徑相同或大 於其徑始可。 擴孔纘頭之挖掘至一段落時，藉top hainmer之逆轉 機構使擴孔纘頭（8 2)與同一體之鑽頭（83)合在一 起，形成比鑽頭（5 4 )之内徑更小的徑而關閉。而且隨 著内鑽捍（5 5 )被回收於地面上時，D T Η (56)及 鑽頭（5 8)也被拉上，被完全拔出後，通常之DTH ( 56)或通常之内鑽桿及内桿鑽頭被接合，而被插入於套 管（5 2)内而再度下降至地中。而且，併用套管鑽頭（ 5 4 )使内桿鑽頭起作用而進行挖堀，並確保基椿耐負荷 體等之插入空間。 (本發明之效果） 本發明之效果列舉於后： 1. 硬地盤與軟地盤均可做適當的挖掘。 2. 即使是軟地盤與硬地盤交互箸積層時，每當改變地 盤也不用更換挖掘設備，得依同一挖掘設備進行挖 - 13 - {請先閲讀背面之注意事須再蟥寫本頁) —裝· 訂· " 本紙張尺度適用中國國家標準（CNS)甲4規格（210 X 297公* ) 82.3. 20,000 210讲 C6 D6 嫌濟部中央镖準局Η工消费合作社印製 五、創作説明 掘作業。 3 .可大幅減低挖堀作業之勞力或成本β 4. 無論地盤之軟硬，可做斜方向之挖掘β 5. 可拔出插入著左牙D ΤΗ的管狀（tube)的零件（ 套管鑽頭）及套管（外管），故可適用於基椿工法 〇 6. DT Η及其連接部拔出後，套管部藉top hammer 加以打擊、回轉即可做單管挖掘。 圖面之簡單說明： 圖1表示使用於第一實施例之挖掘機之主要部份的側面圖 〇 圖2表示構成挖掘機之零件配置的斜視圖。 圖3表示使用於第二實施例之挖掘機之主要部份的側面圖 〇 圖4表示使用於挖掘機之擴孔鑽頭的正面圖。 圖5表示雙虛管方式所用挖掘機之主要部份之側面圔。 圔6表示D TH之正面斷面圖。 圖7表示應插入於内管（tube)之DTH之正面圖。 圖8表示具備與圖7所示情形相異之鑽頭，而被插入於内 管（tube)之狀態的DTH之正面画。 圖9表示圖2之挖掘機所用擴孔鑽頭之正面圖。 (記號之說明） 1.52.....套管 2、54.....套管鑽頭（環鑽） - 14 - 本紙張又度適用中國B家標準（CNS)甲4規格（210 X 297公82.3. 20 000 {請先閲讀背面之注意事項再場寫本頁) -—裝. 訂 Λ" C6 D6 五、創作説明 3 .....内管桿 4 .....内捍鑽頭 5、60.....承接管 10、5 6...潛孔鍵 Down the hole hammer (簡稱D T Η ) 2 2.....擴孔鑽頭 5 0.....挖堀設備 5 8.....潛孔鎚用鑽頭（DTH纘頭） • 6 2.....伸長桿 (請先Μ讀背面之注意事項再塡寫本頁) 經濟部中央標準局貝工消费合作社印製 -15 - 本紙張尺度適用中國國家標準（CNS〉甲4規格（210 X 297公釐） 82.3. 20,000Si〇 ^ v Α, Creation Description Department is equipped with DTH bit (58). Here, at the beginning of excavation, the DTH bit (58) precedes the casing bit (54) and protrudes β. The end opposite to the bit of the casing (52) and the left tooth DTH hammer (56) is provided with a receiving pipe (Adapter) (60). The socket tube (6 〇) indicates that it includes various cup-shaped joints (cupring > (6 6), axle (Swivel) (6 8), etc., and is connected to the slewing, top hammer (not shown) and The power source. Figure 2 clearly shows the components of the receiving pipe (60) shown in the figure. The left tooth DTH hammer (56) is connected to the inner drill rod (55), while the inner drill guard (5 5) is Connected to the extension rod (6 2) ^ Here, the inside of the guard (6 2) is formed with a compressed air passage (6 4) 0 In addition, the sleeve (5 2) is via a cup-shaped joint (6 6) ) Screwed into the cleaning adapter (Cleaning adapter) (72.). Here, the above extension rod (6 2) is inserted into the cleaning adapter (7 2). Moreover, i # 化 轮轴 (6 8) It is installed outside the purification receiving pipe (7 2). The compressed air supply port (7 0) is formed on the purification wheel shaft (6 8), and the compressed air for DT Η driving is passed through the supply port (7〇), The passage (64) is supplied to the left-hand DTH hammer (56). In addition, the purification wheel shaft (6 8) is connected to the handle (Shankrod) (7 4) through the purification receiving tube (7 2), and the maintenance (7 4) is connected to the top hammer (not shown). In addition, the symbol (7 6) in Figure 2 indicates the pad pressing. The axle and rotation force transmitted by the top hammer are passed through the handle -11-- --- 1 '· 1' -------- Γ ------- installed ------ order ----- C chant (please read "Notes on the back side first and then fill in" This page) The standard paper printed by the Industrial and Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs is in accordance with the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) 82.3. 20,000 210 ^ 1 C6 D6 Central Bureau of Economic Development MK Printed by the Industrial and Consumer Cooperative Society * 5. Creation instruction rod (74), purification receiving tube (72), cup-shaped joint (66), casing (52), passed to casing bit (54). Also, not shown , But the right time for digging by the excavation of the left tooth DTH hammer (56) and the casing head (5 4) can be adjusted for the most appropriate digging. The ground is provided with, for example The control mechanism of the operation of the top hammer and compressed air supply mechanism (not shown). In order to drive the left-hand DTH hammer (56) and the casing bit (54), they are formed at the positions where they are screwed with other parts The screw part must be the same The screw direction. I.e. to the right with a screw or screws are left before they can. If one of them is a right screw and a left screw for the other party, either of which is the screw is screwed into its released, and finally fall. When excavating the site, the unillustrated compressed air supply mechanism (air heater) and the top hammer are operated at approximately the same time to perform the excavation work by D T Η and the casing bit. For hard rock sites, the left-hand DTH hammer (5 6) of the internal drill (55) connected to the casing (52) is equipped with a Γ) Τ Η drill bit (58) at its tip. When digging, the D Τ Η bit (5 8) can be excavated at any time (protruding) before the casing bit (54) at any time. When the soft rock site exists in a deeper position than the hard rock site, in order to prevent damage to the tools caused by the accident, the inner rod (5 5) should be pulled up to the ground immediately, and the inner rod bit used for the conventional rotary blow bar should be replaced. Perforate soft rock. When the DTH system is used, the digging diameter will be the same as the digging diameter after changing to the inner rod bit. Also, the diameter of the drill bit (5 8) for DTΗ and the drill bit in the top hammer, any -12-this paper scale is applicable to the Chinese national standard (CNS> A 4 specifications (210 X 297 g *) 82.3. 20,000 (Please read the precautions on the back before writing this page) Install. Order '. &Quot; τ margin! Printed by the Ministry of Economic Affairs Central Stacked Fields and Consumers Cooperative Cooperative gio ^ vi C6 _ _D6_ V. Creation Instructions It is smaller than the diameter of the outer tube bit (casing bit (54)). Moreover, this system is called double-tube double impact β. In Figures 3 and 4, the tip of the left tooth DTH hammer (56) is via The guide device (80) is connected to the reaming bit (8 2). The purification wheel shaft (6 8) receives the air supplied from the ground through the purification receiving tube (7 2), and the left-hand DTH hammer (56) is In the compressed air, the energy is used in the guide device (80), and finally the energy is to activate the reaming bit (82) to dig the ground. The diameter of the off-center shank is not only the casing (52) , It should be the same as or larger than the diameter of the casing head (54). When the reamer head is excavated to a paragraph, use top hainmer to reverse The mechanism makes the reaming head (8 2) and the drill bit (83) of the same body together to form a smaller diameter than the inner diameter of the drill bit (5 4) and closes. And as the inner drill defends (5 5) When recovered on the ground, the DT Η (56) and the drill bit (58) are also pulled up. After being completely pulled out, the usual DTH (56) or the usual inner drill rod and inner rod drill bit are joined and inserted In the casing (52), it is lowered to the ground again. In addition, the casing bit (54) is used to make the inner rod bit work to dig the hole, and to ensure the insertion space of the foundation load bearing body. Effects of the invention) The effects of the present invention are listed below: 1. Both hard and soft sites can be properly excavated. 2. Even when the soft and hard sites interact with each other to deposit layers, there is no need to replace the excavation equipment whenever the site is changed. Must be excavated by the same excavation equipment-13-(Please read the notes on the back side before writing this page)-Pack · Order · " This paper scale is applicable to China National Standard (CNS) A 4 specifications (210 X 297 *) 82.3. 20,000 210 Lectures C6 D6 Printed by the Central Dart Bureau of the Ministry of Economic Affairs H Gong Consumer Cooperative V. Creation Instructions Operations. 3. Can greatly reduce the labor or cost of excavation work. 4. Regardless of the hardness of the site, it can be excavated in an oblique direction. 5. Can extract the tube part (casing drill bit) into which the left tooth DTH is inserted. ) And casing (outer pipe), so it can be applied to the base construction method. 6. After the DT Η and its connection part are pulled out, the casing part is hit by the top hammer and rotated, and single pipe excavation can be done. Brief description of the drawings: FIG. 1 shows a side view of the main part of the excavator used in the first embodiment. FIG. 2 shows a perspective view of the arrangement of parts constituting the excavator. Fig. 3 shows a side view of the main part of the excavator used in the second embodiment. Fig. 4 shows a front view of the reamer bit used in the excavator. Fig. 5 shows the side of the main part of the excavator used in the double virtual tube method.圔 6 represents the front cross-sectional view of D TH. Fig. 7 shows a front view of the DTH to be inserted into the inner tube. Fig. 8 shows a front view of a DTH with a drill bit different from the situation shown in Fig. 7 and inserted into a tube. Fig. 9 shows a front view of the reamer bit used in the excavator of Fig. 2. (Explanation of symbols) 1.52 ..... Casing 2, 54 ..... Casing drill bit (ring drill)-14-This paper is again applicable to China ’s B Family Standard (CNS) Grade 4 specifications (210 X 297 Public 82.3. 20 000 (please read the precautions on the back before writing this page) -—install. Order Λ " C6 D6 5. Creation Instructions 3 ..... Inner tube rod 4 ..... Inner defense bit 5, 60 ..... to take over the pipe 10, 5 6 ... Down the hole hammer (DT Η for short) 2 2 ..... reaming drill bit 5 0 ..... digging machine 5 8 ..... DTH drill bit (DTH thread) • 6 2 ..... Extended rod (please read the notes on the back before writing this page) Beigong Consumer Cooperative of Central Bureau of Standards, Ministry of Economic Affairs Print-15-This paper scale is applicable to Chinese National Standard (CNS> A4 specifications (210 X 297 mm) 82.3. 20,000