JP3235704U - Underground drilling equipment - Google Patents

Abstract

【課題】舗装の切り取りや側溝の一部除去のための作業を省略して、水道管の埋設工事ができる、地中掘削装置を提供する。
【解決手段】先行部１２は、駆動軸１６の一端の尖端部２０の近傍に、尖端部２０に向かうほど順次外径を縮めるスクリューを設けた掘削部２６を備え、駆動軸１６の掘削部２６から接続部１８に至る部分に、同じ外径で一定のピッチ（尖端部より大きい）のスクリューを設けた搬送部２４を備えた。掘削が進むにつれて、先行部１２に対して雄ねじ部３８または雌ねじ部４０を介して順次継ぎ足される複数の延長部１３とを備え、道路を横断した掘削もできる。
【選択図】図５

PROBLEM TO BE SOLVED: To provide an underground drilling device capable of burying a water pipe by omitting work for cutting a pavement and removing a part of a gutter.
SOLUTION: A leading portion 12 is provided with an excavation portion 26 provided with a screw whose outer diameter is sequentially reduced toward the tip portion 20 in the vicinity of a tip portion 20 at one end of the drive shaft 16, and the excavation portion 26 of the drive shaft 16 is provided. A transport portion 24 provided with screws having the same outer diameter and a constant pitch (larger than the tip portion) is provided in a portion extending from the portion to the connection portion 18. As the excavation progresses, a plurality of extension portions 13 which are sequentially added to the leading portion 12 via the male screw portion 38 or the female screw portion 40 are provided, and excavation across the road is also possible.
[Selection diagram] FIG. 5

Description

本考案は、水道管等を埋設するために地中に孔を掘るための地中掘削装置に関する。 The present invention relates to an underground drilling device for digging a hole in the ground for burying a water pipe or the like.

例えば、道路に埋設された水道本管を分岐して道路沿いの建物に水道管を引き込む場合には、道路の一部と建物の敷地の一部を掘り割り状に掘削して、分岐用の水道管を埋設する。この場合には、道路の舗装を切り取り、道路脇の側溝の一部を除去し、建物の敷地の舗装を切り取る。このために、様々な工具を使用する。 For example, when branching a water pipe buried in a road and pulling the water pipe into a building along the road, a part of the road and a part of the building site are excavated in a split shape for branching. Buried water pipes. In this case, the pavement of the road is cut off, a part of the gutter on the side of the road is removed, and the pavement of the building site is cut off. Various tools are used for this.

特開２００２－１４６７６１号公報Japanese Unexamined Patent Publication No. 2002-146716 実用新案登録３１６９９２７号公報Utility model registration No. 3169927

既知の従来の技術には、次のような解決すべき課題があった。
水道工事は道路の一部を塞ぐために、道路交通の妨げになる。従って、できるだけ作業を短時間で終えたい。建物の敷地内についても同様である。しかしながら、舗装の切り取りや側溝の一部除去と復旧には、相応の作業量と時間が必要で、時間短縮は容易でない。複雑な掘削工具も紹介されているが、幅員の狭い道路等では作業スペースを確保できない。また、側溝（Ｕ字溝）を一部除去して掘り起こしをした場合には、埋め戻した後の地面を押し固めるための復旧工事が必要になり、作業負荷が大きい。特に、舗装道路の路面の切り取りは道路交通に与える影響が大きい。本考案は以上の点に着目してなされたもので、舗装道路の地下の横断を可能にした、地中掘削装置を提供することを目的とする。 The known conventional techniques have the following problems to be solved.
Waterworks block a part of the road, which hinders road traffic. Therefore, I want to finish the work in the shortest possible time. The same applies to the premises of the building. However, cutting out the pavement and removing and restoring a part of the gutter requires a considerable amount of work and time, and it is not easy to shorten the time. Although complicated excavation tools are also introduced, it is not possible to secure a work space on narrow roads. In addition, if a gutter (U-shaped groove) is partially removed and dug up, restoration work is required to compact the ground after backfilling, which increases the workload. In particular, cutting the road surface of a paved road has a large effect on road traffic. The present invention has been made by paying attention to the above points, and an object of the present invention is to provide an underground drilling device capable of crossing an underground road on a paved road.

以下の構成は上記の課題を解決するための手段である。 The following configuration is a means for solving the above problems.

〈構成１〉
回転機１４の回転軸１５に、地面を掘削する先行部１２と、上記回転軸１５の回転を先行部１２に伝達するために、掘削が進むにつれて、順次継ぎ足される複数の延長部１３とを備え、
上記先行部１２は、
その駆動軸１６の一端に回転機１４の回転軸１５を接続するための雄ねじ部３８または雌ねじ部４０を備え、他端に尖端部２０を備え、駆動軸１６の尖端部２０の近傍に、最大外径がＲ１で、尖端部２０に向かうほど順次外径を縮めるピッチＬ２のスクリューを設けた掘削部２６を備え、前記駆動軸１６の掘削部２６から前記接続部１８に至る部分に、外径Ｒ１で一定のピッチＬ１（Ｌ１＞Ｌ２） のスクリューを設けた搬送部２４を備えており、
前記延長部１３は、
その駆動軸１６の全長に前記の一定のピッチのスクリューを設けた搬送部２４を備え、一端に回転機１４の回転軸１５または別の延長部１３に設けられた雄ねじ部３８または雌ねじ部４０と連結するための雄ねじ部３８または雌ねじ部４０を備え、他端に別の延長部１３を連結するための雄ねじ部３８または雌ねじ部４０を備えていることを特徴とする地中掘削装置。 <Structure 1>
The rotating shaft 15 of the rotary machine 14 is provided with a leading portion 12 for excavating the ground and a plurality of extending portions 13 which are sequentially added as excavation progresses in order to transmit the rotation of the rotating shaft 15 to the leading portion 12. ,
The leading part 12 is
A male screw portion 38 or a female screw portion 40 for connecting the rotary shaft 15 of the rotary machine 14 is provided at one end of the drive shaft 16, a tip portion 20 is provided at the other end, and the maximum is in the vicinity of the tip portion 20 of the drive shaft 16. An excavation portion 26 having an outer diameter of R1 and provided with a screw having a pitch L2 that gradually reduces the outer diameter toward the tip portion 20 is provided, and the outer diameter extends from the excavation portion 26 of the drive shaft 16 to the connection portion 18. It is provided with a transport unit 24 provided with a screw having a constant pitch L1 (L1> L2) at R1.
The extension portion 13 is
The entire length of the drive shaft 16 is provided with a transport portion 24 provided with screws of the constant pitch, and one end thereof is a male screw portion 38 or a female screw portion 40 provided on the rotary shaft 15 of the rotary machine 14 or another extension portion 13. An underground excavator comprising a male screw portion 38 or a female screw portion 40 for connecting, and a male screw portion 38 or a female screw portion 40 for connecting another extension portion 13 at the other end.

〈構成２〉
接続部１８の雄ネジ部３８側と雌ネジ部４０側には、外周面にスパナ部掛け部が設けられていることを特徴とする請求項１に記載の地中掘削装置。 <Structure 2>
The underground excavation device according to claim 1, wherein a spanner portion hanging portion is provided on the outer peripheral surface on the male screw portion 38 side and the female screw portion 40 side of the connection portion 18.

〈構成３〉
回転機１４には、掘削時の反作用による回転機の回転を阻止する脚が設けられていることを特徴とする請求項１または２に記載の地中掘削装置。 <Structure 3>
The underground excavation device according to claim 1 or 2, wherein the rotary machine 14 is provided with a leg that prevents the rotary machine from rotating due to a reaction during excavation.

先行部１２に設けられた尖端部２０と掘削部２６は、最大外径がＲ１で、尖端部２０に向かうほど順次外径を縮めるピッチＬ２のスクリューで、地面３０を掘削する。ピッチが小さく全体としてテーパー状になっているので、土を細かく砕いて掘削できる。搬送部２４は大きなピッチのスクリューで掘削した土砂を後方に排出する。
回転機１４の回転軸１５に、掘削が進むにつれて、地面を掘削する先行部１２に対して、複数の延長部１３を順次継ぎ足すことができるので、舗装面４３を傷つけずに、その地下を横断するように掘削することができる。 The tip portion 20 and the excavation portion 26 provided in the leading portion 12 excavate the ground 30 with a screw having a maximum outer diameter of R1 and a pitch L2 that gradually reduces the outer diameter toward the tip portion 20. Since the pitch is small and the taper shape as a whole, the soil can be crushed into small pieces for excavation. The transport unit 24 discharges the earth and sand excavated by the screw of a large pitch to the rear.
As excavation progresses, a plurality of extension portions 13 can be sequentially added to the leading portion 12 for excavating the ground on the rotating shaft 15 of the rotary machine 14, so that the underground can be laid underground without damaging the pavement surface 43. It can be excavated to cross.

図１（ａ）は地中掘削装置の実施例を示す側面図、（ｂ）は尖端部２０の駆動軸１６を中心に９０度回転した側面図、（ｃ）は掘削時の掘削部２６の作用を説明する側面図である。1 (a) is a side view showing an embodiment of an underground excavation device, (b) is a side view rotated 90 degrees around a drive shaft 16 of a tip portion 20, and (c) is a side view of an excavation portion 26 during excavation. It is a side view explaining the action. 地中掘削装置の使用方法を示す地面の縦断面図である。It is a vertical sectional view of the ground which shows the usage of the underground drilling apparatus. 図３（ａ）は、掘削が進んだ状態の地面の横断面図で、（ｂ）は縦断面図である。FIG. 3A is a cross-sectional view of the ground in a state where excavation has progressed, and FIG. 3B is a vertical cross-sectional view. 地面３０に明けた孔に保護管３２を挿入した状態を示し、（ａ）は地面の横断面図、（ｂ）は地面の縦断面図である。A state in which the protective tube 32 is inserted into the hole made in the ground 30 is shown, (a) is a cross-sectional view of the ground, and (b) is a vertical cross-sectional view of the ground. 先行部１２と延長部１３とを連結して掘削をしている状態の地面の断面図である。It is sectional drawing of the ground in the state which the leading part 12 and the extension part 13 are connected and excavated.

以下、本考案の実施の形態を実施例毎に詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail for each example.

図１（ａ）は地中掘削装置の実施例を示す側面図、（ｂ）はその尖端部２０の駆動軸１６を中心に９０度回転した側面図、（ｃ）は掘削時の掘削部２６の作用を説明する側面図である。
この地中掘削装置は、後で図５を用いて説明するように、先行部１２と延長部１３とを連結して掘削を行なう。この図１では、装置の駆動用の回転機１４と先行部１２の構造について、説明をする。 1 (a) is a side view showing an embodiment of an underground excavation device, (b) is a side view rotated 90 degrees around a drive shaft 16 of the tip portion 20, and (c) is an excavation portion 26 at the time of excavation. It is a side view explaining the action of.
In this underground excavation device, as will be described later with reference to FIG. 5, the leading portion 12 and the extension portion 13 are connected to perform excavation. In FIG. 1, the structure of the rotating machine 14 for driving the apparatus and the preceding portion 12 will be described.

図に示した先行部１２は、例えば、全長が１ｍ前後の鋼鉄製のもので構成することができる。駆動軸１６の外径は例えば２ｃｍ程度、中間部のスクリューの外径Ｒ１は例えば５ｃｍ程度のものである。先行部１２の駆動軸１６の一端は、回転機１４を接続するための接続部を備える。また、駆動軸１６の他端は、地面に突き刺すための尖端部２０を備える。 The leading portion 12 shown in the figure can be made of, for example, a steel having a total length of about 1 m. The outer diameter of the drive shaft 16 is, for example, about 2 cm, and the outer diameter R1 of the screw in the middle portion is, for example, about 5 cm. One end of the drive shaft 16 of the leading portion 12 includes a connecting portion for connecting the rotating machine 14. Further, the other end of the drive shaft 16 is provided with a tip portion 20 for piercing the ground.

この先行部１２は、一端に回転機１４の回転軸１５に設けられた雄ねじ部３８と連結するための雌ねじ部４０を備えている。なお、回転軸１５に雌ねじ部４０を設けて先行部１２の側に雄ねじ部３８を設けても構わない。 The leading portion 12 is provided with a female screw portion 40 for connecting to a male screw portion 38 provided on the rotating shaft 15 of the rotary machine 14 at one end. The female screw portion 40 may be provided on the rotating shaft 15 and the male screw portion 38 may be provided on the side of the leading portion 12.

先行部１２の駆動軸１６の尖端部２０の近傍には、最大外径がＲ１で、尖端部２０に向かうほど順次外径を縮めるピッチＬ２のスクリューを設けた。この部分は地面を掘削する機能を持ち、掘削部２６と呼ぶことにする。一方、駆動軸１６の掘削部２６から接続部１８に至る部分には、外径Ｒ１で一定のピッチＬ１（Ｌ１＞Ｌ２） のスクリューを設けた。この部分は掘削した土砂を後方に送り、孔径を整える機能を持ち、搬送部２４と呼ぶことにする。 In the vicinity of the tip portion 20 of the drive shaft 16 of the leading portion 12, a screw having a maximum outer diameter of R1 and a pitch L2 whose outer diameter is gradually reduced toward the tip portion 20 is provided. This part has a function of excavating the ground and is called an excavation part 26. On the other hand, a screw having a constant pitch L1 (L1> L2) with an outer diameter R1 is provided in a portion of the drive shaft 16 from the excavated portion 26 to the connecting portion 18. This portion has a function of sending excavated earth and sand to the rear and adjusting the hole diameter, and is referred to as a transport portion 24.

図の（ｂ）に示すように、尖端部２０は、地面３０中の土砂を突き崩す先端形状をしている。掘削部２６は、地面の土を十分に細かく砕く役割をする。細かく砕かれた土は、搬送部２４の回転により後方（接続部１８の方向）に送られる。搬送部２４のスクリューピッチが掘削部２６のスクリューピッチと等しいと、先行部１２が丁度ネジ釘のように土中にねじ込まれて、回転が止まってしまう。掘削部２６のスクリューピッチが搬送部２４のものより大きいと、掘削した土砂が十分に細かくならず、搬送部２４で搬送できない。従って、掘削部２６のスクリューピッチが狭い構成が適する。この先行部１２は、電線管やガス管のように、外径が数センチメートル程度の管類の敷設に適する工具である。 As shown in (b) of the figure, the tip portion 20 has a tip shape that breaks through the earth and sand in the ground 30. The excavation section 26 serves to crush the soil on the ground sufficiently. The finely crushed soil is sent backward (in the direction of the connecting portion 18) by the rotation of the transport portion 24. When the screw pitch of the transport portion 24 is equal to the screw pitch of the excavation portion 26, the leading portion 12 is screwed into the soil just like a screw nail, and the rotation stops. If the screw pitch of the excavated section 26 is larger than that of the transport section 24, the excavated earth and sand will not be sufficiently fine and cannot be transported by the transport section 24. Therefore, a configuration in which the screw pitch of the excavation portion 26 is narrow is suitable. The preceding portion 12 is a tool suitable for laying pipes having an outer diameter of about several centimeters, such as electric wire pipes and gas pipes.

図２は、先行部１２の使用方法を示す地面の縦断面図である。
図のように、先行部１２の接続部１８は、上記のように雄ねじ部３８や雌ねじ部４０を用いて回転機１４の回転軸１５に装着されている。回転機１４は電動モータ等であって、先行部１２の駆動軸１６を回転駆動する。先行部１２の尖端部２０は、先に説明したように、地面を掘削しながら前進する。掘削部２６は、土砂を細かく粉砕しながら孔径をＲ１まで拡げる。掘削部２６はピッチが小さく全体としてテーパー状になっているので、比較的小さい力で掘削ができる。 FIG. 2 is a vertical sectional view of the ground showing how to use the leading portion 12.
As shown in the figure, the connecting portion 18 of the leading portion 12 is mounted on the rotating shaft 15 of the rotary machine 14 by using the male screw portion 38 and the female screw portion 40 as described above. The rotary machine 14 is an electric motor or the like, and rotationally drives the drive shaft 16 of the preceding portion 12. The tip portion 20 of the leading portion 12 advances while excavating the ground as described above. The excavation section 26 expands the hole diameter to R1 while finely crushing the earth and sand. Since the excavation portion 26 has a small pitch and is tapered as a whole, excavation can be performed with a relatively small force.

図３（ａ）は、掘削が進んだ状態の地面の横断面図で、（ｂ）は縦断面図である。
搬送部２４は、大きなピッチＬ１のスクリューで、掘削した土砂を後方に排出する。地面３０にはＵ字溝２８が設置されている。回転機１４により駆動軸１６を回転駆動して、回転機１４を矢印Ａの方向に手で押すことにより、Ｕ字溝２８の下側に掘削孔３６を形成することができる。Ｕ字溝２８を動かす必要はない。 FIG. 3A is a cross-sectional view of the ground in a state where excavation has progressed, and FIG. 3B is a vertical cross-sectional view.
The transport unit 24 is a screw with a large pitch L1 and discharges the excavated earth and sand to the rear. A U-shaped groove 28 is installed on the ground 30. The excavation hole 36 can be formed under the U-shaped groove 28 by rotationally driving the drive shaft 16 by the rotary machine 14 and manually pushing the rotary machine 14 in the direction of the arrow A. It is not necessary to move the U-shaped groove 28.

図４は、図３のようにして地面３０に明けた孔に保護管３２を挿入した状態を示し、（ａ）は地面の横断面図、（ｂ）は地面の縦断面図である。
図３で掘削した孔に、丁度搬送部２４のスクリュー外径Ｒ１の保護管３２を挿入する。この保護管３２の内部に水道管２１を挿入する。保護管３２は、水道管２１に直接外圧が加わらないようにする保護の役割を果たす。 4A and 4B show a state in which the protective tube 32 is inserted into the hole made in the ground 30 as shown in FIG. 3, where FIG. 4A is a cross-sectional view of the ground and FIG. 4B is a vertical cross-sectional view of the ground.
The protective tube 32 having the screw outer diameter R1 of the transport portion 24 is inserted into the hole excavated in FIG. The water pipe 21 is inserted inside the protection pipe 32. The protection pipe 32 serves as a protection to prevent an external pressure from being directly applied to the water pipe 21.

以上のようにすれば、図４（ｂ）に示すように、図の左側から図の右側へ、Ｕ字溝２８を取り外すことなく水道管３２の埋設工事ができる。先行部１２のスクリューの外径が保護管３２の外径とほぼ等しいものを使用すると、保護管３２を埋設する場所以外の地面３０の掘削をすることなく工事が完了する。従って、周辺の土を押し固めたり埋め戻したりする作業を最小限にすることができる。また、先行部１２は、全長を十分に短くできるので、小型軽量で、舗装道路やＵ字溝の下等を掘削するのに適する。 As described above, as shown in FIG. 4B, the water pipe 32 can be buried from the left side of the figure to the right side of the figure without removing the U-shaped groove 28. If the screw whose outer diameter of the leading portion 12 is substantially equal to the outer diameter of the protective pipe 32 is used, the construction is completed without excavating the ground 30 other than the place where the protective pipe 32 is buried. Therefore, the work of compacting and backfilling the surrounding soil can be minimized. Further, since the leading portion 12 can have a sufficiently short overall length, it is small and lightweight, and is suitable for excavating under a paved road or a U-shaped groove.

図５（ａ）には、道路の横断面図を示した。図５（ｂ）の右側には先行部１２を、左側には延長部１３を、それぞれ側面図で示した。 FIG. 5A shows a cross-sectional view of the road. The leading portion 12 is shown on the right side of FIG. 5B, and the extension portion 13 is shown on the left side in a side view.

この図の装置は、舗装面４３の下を道路を横切るように穴を掘り進めている。先行部１２の構造は、既に図１（ａ）を用いて説明した通りである。 The device in this figure is digging a hole under the pavement 43 so as to cross the road. The structure of the preceding portion 12 is as already described with reference to FIG. 1 (a).

延長部１３は、先行部１２の後に継ぎ足しをして、その長さを延長するためのもので、複数準備する。延長部１３の駆動軸１６の全長に、先行部１２と同じ搬送部２４を設けてある。搬送部２４は、本体部と同様の外径Ｒ１で一定のピッチＬ１のスクリューを有する。 A plurality of extension portions 13 are prepared to be added after the leading portion 12 to extend the length thereof. The same transport section 24 as the leading section 12 is provided on the entire length of the drive shaft 16 of the extension section 13. The transport portion 24 has a screw having an outer diameter R1 and a constant pitch L1 similar to that of the main body portion.

延長部１３の一端（右端）には、先行部１２の雌ネジ部４０と接続するための雄ネジ部３８が設けられている。延長部１３の他端（左端）には回転機１４の回転軸１５に設けられた雄ネジ部３８や、継ぎ足しされる他の延長部１３に設けられた雄ネジ部３８と接続するための雌ネジ部４０が設けられている。 At one end (right end) of the extension portion 13, a male screw portion 38 for connecting to the female screw portion 40 of the leading portion 12 is provided. At the other end (left end) of the extension portion 13, a female for connecting to a male screw portion 38 provided on the rotating shaft 15 of the rotary machine 14 and a male screw portion 38 provided on another extension portion 13 to be added. A screw portion 40 is provided.

即ち、回転機１４の回転軸１５と先行部１２と延長部１３との間の接続には、いずれも、雄ネジ部３８や雌ネジ部４０を使用する。いずれか一方が雄ネジ部３８を備え、他方が雌ネジ部４０を備えていればよい。 That is, a male screw portion 38 and a female screw portion 40 are used for the connection between the rotary shaft 15 of the rotary machine 14, the leading portion 12, and the extension portion 13. It suffices that one of them has a male screw portion 38 and the other has a female screw portion 40.

例えば、図１（ａ）や図５（ａ）の例とは逆に、回転機１４の回転軸１５に雌ネジ部４０が設けられているときは、先行部１２には雄ネジ部３８が設けられ、延長部１３の先行部１２側には、雌ネジ部４０が設けられる。延長部１３の回転機１４側には雄ネジ部３８が設けられる。この接続部１８の着脱時にスパナを使用できるように、雄ネジ部３８側にも雌ネジ部４０側にも、六角形の外周面のスパナ掛け部を設けておくとよい。 For example, contrary to the examples of FIGS. 1 (a) and 5 (a), when the female screw portion 40 is provided on the rotating shaft 15 of the rotary machine 14, the male screw portion 38 is provided on the leading portion 12. A female screw portion 40 is provided on the leading portion 12 side of the extension portion 13. A male screw portion 38 is provided on the rotating machine 14 side of the extension portion 13. A hexagonal outer peripheral surface spanner hooking portion may be provided on both the male screw portion 38 side and the female screw portion 40 side so that the spanner can be used when attaching / detaching the connection portion 18.

掘削工事の始めに、掘削を開始する側の地面３０を、先行部１２と回転機１４が収まる程度の長さだけ、掘り下げておく。その後、図５（ａ）の例に示すように複数の延長部１３を継ぎ足していく。この要領で、２メートルから４メートル程度の長さまで延長をすることができる。これにより、４メートル幅の道路を横切ることが出来る。 At the beginning of the excavation work, the ground 30 on the side where the excavation is started is dug down to a length enough to accommodate the leading portion 12 and the rotating machine 14. After that, as shown in the example of FIG. 5A, a plurality of extension portions 13 are added. In this way, it can be extended from 2 meters to 4 meters in length. This allows you to cross a 4 meter wide road.

馬力の強い回転機１４を使用すれば、さらに長い掘削も可能である。いずれの接続部もねじを締めて連結するので、この程度の長さの場合には、がたつきがなくて、直線的に十分強度を保ったまま延長することができる。 Even longer excavation is possible by using the rotating machine 14 having a strong horsepower. Since both connection portions are connected by tightening screws, there is no rattling in the case of this length, and it can be extended linearly while maintaining sufficient strength.

必要な掘削を終えた後は、全体を引き抜きながら、延長部１３を１本ずつ外していけばよい。駆動軸を逆回転させなければ、引き抜きの際にねじが緩んで外れるような心配は無い。そのまま全体を少しずつ引き抜くので、孔の形状を保ったままにすることができ、保護管３２をすぐに挿入してその後の孔の崩れを防ぐことができる。 After completing the necessary excavation, the extension portions 13 may be removed one by one while pulling out the whole. If the drive shaft is not rotated in the reverse direction, there is no concern that the screw will loosen and come off when it is pulled out. Since the whole is pulled out little by little as it is, the shape of the hole can be maintained, and the protective tube 32 can be immediately inserted to prevent the hole from collapsing thereafter.

以上のようにして、道路の舗装面を傷つけることなく、水道管を敷設することが可能になる。また、保護管３２を埋設するので、保護管３２内に水道管のみならず電気ケーブルや通信ケーブルを施設することも出来る。 As described above, it is possible to lay water pipes without damaging the pavement surface of the road. Further, since the protective pipe 32 is embedded, not only the water pipe but also the electric cable and the communication cable can be installed in the protective pipe 32.

１２ 先行部
１３ 延長部
１４ 回転機
１５ 回転軸
１６ 駆動軸
１８ 接続部
２０ 尖端部
２１ 水道管
２４ 搬送部
２６ 掘削部
２８ Ｕ字溝
３０ 地面
３２ 保護管
３６ 掘削孔
３８ 雄ねじ部
４０ 雌ねじ部
４３ 舗装面 12 Leading part 13 Extension part 14 Rotating machine 15 Rotating shaft 16 Drive shaft 18 Connection part 20 Tip part 21 Water pipe 24 Transport part 26 Excavation part 28 U-shaped groove 30 Ground 32 Protective pipe 36 Excavation hole 38 Male thread part 40 Female thread part 43 Pavement surface

Claims (2)

回転機１４の回転軸１５に、地面を掘削する先行部１２と、上記回転軸１５の回転を先行部１２に伝達するために、掘削が進むにつれて、順次継ぎ足される複数の延長部１３とを備え、
上記先行部１２は、
その駆動軸１６の一端に回転機１４の回転軸１５を接続するための雄ねじ部３８または雌ねじ部４０を備え、他端に尖端部２０を備え、駆動軸１６の尖端部２０の近傍に、最大外径がＲ１で、尖端部２０に向かうほど順次外径を縮めるピッチＬ２のスクリューを設けた掘削部２６を備え、前記駆動軸１６の掘削部２６から前記接続部１８に至る部分に、外径Ｒ１で一定のピッチＬ１（Ｌ１＞Ｌ２） のスクリューを設けた搬送部２４を備えており、
前記延長部１３は、
その駆動軸１６の全長に前記の一定のピッチのスクリューを設けた搬送部２４を備え、一端に回転機１４の回転軸１５または別の延長部１３に設けられた雄ねじ部３８または雌ねじ部４０と連結するための雄ねじ部３８または雌ねじ部４０を備え、他端に別の延長部１３を連結するための雄ねじ部３８または雌ねじ部４０を備えていることを特徴とする地中掘削装置。 The rotating shaft 15 of the rotary machine 14 is provided with a leading portion 12 for excavating the ground and a plurality of extending portions 13 which are sequentially added as excavation progresses in order to transmit the rotation of the rotating shaft 15 to the leading portion 12. ,
The leading part 12 is
A male screw portion 38 or a female screw portion 40 for connecting the rotary shaft 15 of the rotary machine 14 is provided at one end of the drive shaft 16, a tip portion 20 is provided at the other end, and the maximum is in the vicinity of the tip portion 20 of the drive shaft 16. An excavation portion 26 having an outer diameter of R1 and provided with a screw having a pitch L2 that gradually reduces the outer diameter toward the tip portion 20 is provided, and the outer diameter extends from the excavation portion 26 of the drive shaft 16 to the connection portion 18. It is provided with a transport unit 24 provided with a screw having a constant pitch L1 (L1> L2) at R1.
The extension portion 13 is
The entire length of the drive shaft 16 is provided with a transport portion 24 provided with screws of the constant pitch, and one end thereof is a male screw portion 38 or a female screw portion 40 provided on the rotary shaft 15 of the rotary machine 14 or another extension portion 13. An underground excavator comprising a male screw portion 38 or a female screw portion 40 for connecting, and a male screw portion 38 or a female screw portion 40 for connecting another extension portion 13 at the other end. 接続部１８の雄ネジ部３８側と雌ネジ部４０側には、外周面にスパナ部掛け部が設けられていることを特徴とする請求項１に記載の地中掘削装置。 The underground excavation device according to claim 1, wherein a spanner portion hanging portion is provided on the outer peripheral surface on the male screw portion 38 side and the female screw portion 40 side of the connection portion 18.

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