JPH0921131A - Construction of continuous underground hole - Google Patents
Construction of continuous underground holeInfo
- Publication number
- JPH0921131A JPH0921131A JP16981395A JP16981395A JPH0921131A JP H0921131 A JPH0921131 A JP H0921131A JP 16981395 A JP16981395 A JP 16981395A JP 16981395 A JP16981395 A JP 16981395A JP H0921131 A JPH0921131 A JP H0921131A
- Authority
- JP
- Japan
- Prior art keywords
- holes
- hole
- drilled
- continuous underground
- guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は連続地中孔の施工方法に
関し、特に、転石層、岩盤等の硬い地盤が存在する地域
に対して連続した地中孔を削孔するのに適した連続地中
孔の施工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a continuous underground hole, and particularly to a continuous underground hole suitable for drilling a continuous underground hole in an area where a hard ground such as a boulder layer or a rock exists The method of constructing an underground hole.
【０００２】[0002]
【従来の技術】土留め壁等を構築する際に、構築箇所に
先ず鋼矢板等の応力負担材を打ち込むことが行われる。
軟質地盤の場合には、振動杭打ち機等を用いて地中に直
接打ち込むことが可能であるが、硬い地盤あるいは部分
的に硬い地盤が層状に存在する地盤の場合には、掘削機
により地中孔を先ず削孔し、その掘削孔に鋼矢板等を打
ち込むことが行われる。2. Description of the Related Art When constructing an earth retaining wall or the like, a stress-bearing member such as a steel sheet pile is first driven into a construction site.
In the case of soft ground, it is possible to drive it directly into the ground using a vibrating pile driver, etc., but in the case of hard ground or partially hard ground that exists in layers, the ground is excavated by an excavator. First, a hole is drilled in a middle hole, and a steel sheet pile or the like is driven into the hole.
【０００３】[0003]
【発明が解決しようとする課題】前記のような場合に、
所要の幅員にわたり連続した鋼矢板を打ち込むには、連
続した地中孔を形成する必要がある。しかし、転石層、
岩盤等の硬い地盤あるいはそのような硬い地盤が層状に
存在する地域に対して、掘削機により垂直な地中孔を連
続した状態で掘削していくことは容易でない。通常のス
クリュー軸の下段にキリを装着した掘削軸を持つ掘削機
によっては、転石層、岩盤等の硬い地盤を掘削していく
ことそのものが困難であり、掘削できたとしても、キリ
の先端がより抵抗の少ない方に逃げてしまうことにより
未切削部分が生じ、鋼矢板の打ち込みが十分に行えない
場合が生じる。SUMMARY OF THE INVENTION In the above cases,
In order to drive a continuous steel sheet pile over a required width, it is necessary to form a continuous underground hole. But the boulder layer,
It is not easy to excavate a vertical ground hole continuously with an excavator in a hard ground such as rock or an area where such hard ground exists in layers. It is difficult to excavate hard ground such as boulders, rocks, etc., depending on the excavator that has an excavation axis equipped with a drill in the lower stage of a normal screw shaft. When the steel sheet pile is not sufficiently driven, the uncut portion is generated by escaping to the side having less resistance.
【０００４】上記のような不都合を解消する掘削機とし
て、先端にダウンハンマーを持つ掘削軸を装備した掘削
機が用いられるようになり、硬い地盤に対して比較的容
易に地中孔を削孔することができるようになりつつあ
る。しかしながら、ダウンハンマーを持つ掘削機の場合
であっても地盤の状況によっては連続した地中孔を削孔
しようとするとダウンハンマーがより抵抗の少ない方
（すなわち、すでに削孔した地中孔側）に逃げてしま
い、十分な施工精度を挙げれない場合がある。An excavator equipped with an excavation shaft having a down hammer at its tip has come to be used as an excavator for solving the above-mentioned inconvenience, and it is relatively easy to drill an underground hole in a hard ground. It is becoming possible to do it. However, even in the case of an excavator with a downhammer, depending on the ground conditions, the one with a lower downhammer has less resistance when attempting to drill a continuous underground hole (that is, the side of the already drilled hole). There is a case that it does not raise sufficient construction accuracy because it escapes to.
【０００５】従って、本発明の目的は、連続地中孔を施
工するに当たっての上記のような不都合を解消すること
を目的とし、より具体的には、転石層、岩盤等の硬い地
盤に対しても高い施工精度でもって連続した地中孔を削
孔することを可能とした連続地中孔の施工方法を提供す
ることにある。Therefore, an object of the present invention is to eliminate the above-mentioned inconvenience in constructing a continuous underground hole, and more specifically, for hard ground such as boulders and rocks. Another object of the present invention is to provide a method of constructing a continuous underground hole that enables drilling of a continuous underground hole with high construction accuracy.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めの本発明による連続地中孔の施工方法は、好ましくは
先端にダウンハンマーを持つ掘削軸を装備した掘削機を
用いて複数個の地中孔を所定ピッチでかつ不連続状に削
孔する工程、削孔された地中孔を埋め戻し材により一部
埋め戻す工程、該一部埋め戻された孔中にガイドとなる
鋼材を挿入する工程、該鋼材が挿入された隣接する地中
孔の間を該鋼材をガイドとして削孔し連続した地中孔と
する工程、及び、該挿入した鋼材を引き抜く工程、とを
順次繰り返すことを特徴とする。該鋼材をガイドとして
削孔した孔中に埋め戻し材を投入した後に、先に挿入し
た鋼材を引き抜く工程ようにしてもよい。In order to achieve the above object, the method of constructing a continuous underground hole according to the present invention preferably uses a plurality of excavators equipped with an excavating shaft having a down hammer at the tip. A step of drilling the underground holes at a predetermined pitch in a discontinuous manner, a step of partially backfilling the drilled underground holes with a backfill material, and a steel material serving as a guide in the partially backfilled holes. Repeating sequentially the step of inserting, the step of making a continuous underground hole by drilling the steel material between the adjacent underground holes into which the steel material has been inserted as a guide, and the step of extracting the inserted steel material. Is characterized by. A step of inserting the backfill material into the hole drilled using the steel material as a guide and then withdrawing the steel material inserted earlier may be performed.
【０００７】好ましくは、前記鋼材を引き抜く工程の後
に、形成された連続地中孔に応力負担材としての鋼矢板
等が打設される。前記ガイド用鋼材としてはＨ型鋼のよ
うな型鋼材を用い、その長手方向の幅広部（フランジ
部）を地中孔の連続方向に向けた姿勢で削孔した孔中に
挿入し固定することが望ましいが、これに限ることな
く、削孔時に既設の孔側へ掘削軸が逃げないように案内
する機能を果たし得るものであれば、Ｉ型鋼やチャンネ
ル鋼等任意のものを用い得る。[0007] Preferably, after the step of pulling out the steel material, a steel sheet pile or the like as a stress bearing material is driven into the formed continuous underground hole. A shaped steel material such as an H-shaped steel is used as the guide steel material, and the wide portion (flange portion) in the longitudinal direction thereof may be inserted and fixed in the drilled hole in a posture in which it is oriented in the continuous direction of the underground hole. It is desirable, but not limited to this, and any type such as I-type steel or channel steel may be used as long as it can perform a function of guiding the excavation shaft to the existing hole side so as not to escape at the time of drilling.
【０００８】埋め戻し材は、孔に挿入されるガイド用鋼
材を安定に支持する目的と、削孔時にダウンハンマーに
より破砕された岩石等により掘削孔が埋め戻されるのを
防止する目的の双方から用いられるものであり、砂や、
骨材（砕石）、ベントナイトのような材料が有効に用い
られる。必要に応じて用いられるダウンハンマーに特に
制限はなく、従来知られた任意のダウンハンマーを用い
得るが、本出願人が、特開平６−２１２８７０号公報あ
るいは特開平７−４１６６号公報において既に提案して
いる水や土質改良剤等の流体を放出可能とした改良され
たダウンハンマーは特に有効に用いることができる。The backfill material is used both for the purpose of stably supporting the guide steel material inserted into the hole and for the purpose of preventing the drill hole from being backfilled by the rock crushed by the down hammer at the time of drilling. It is used, sand,
Materials such as aggregate (crushed stone) and bentonite are effectively used. The down hammer used as necessary is not particularly limited, and any conventionally known down hammer can be used, but the present applicant has already proposed it in JP-A-6-212870 or JP-A-7-4166. An improved down hammer capable of releasing a fluid such as water and soil conditioner can be used particularly effectively.
【０００９】[0009]
【作 用】本発明の施工法においては、鋼矢板のような
打ち込むべき応力負担材の横幅よりも幾分大きな外径の
掘削軸を装備した掘削機を用いて、先ず１つの地中孔を
削孔する。削孔終了後に掘削軸を引き上げ、鋼矢板の打
ち込み方向（直線状でも湾曲状でもよい）に当該応力負
担材のほぼ２枚分の横幅に相当する距離だけ掘削軸を移
動させた後、再び削孔する。以下、この作業を必要回程
度繰り返す。[Operation] In the construction method of the present invention, an excavator equipped with an excavation shaft having an outer diameter slightly larger than the lateral width of a stress-bearing material to be driven, such as a steel sheet pile, is first used to form one underground hole. Drill holes. After finishing the drilling, the excavation shaft is pulled up, and the excavation shaft is moved in the driving direction of the steel sheet pile (either straight or curved) by a distance corresponding to the width of about two sheets of the stress-bearing material, and then the excavation shaft is re-cut. Make a hole. Hereinafter, this work is repeated about required times.
【００１０】前記削孔作業と平行して、あるいは、所定
数の削孔を終えた時点で、削孔された孔中に所定の深さ
まで埋め戻し材を投入する。埋め戻し深さは任意である
が、少なくとも後で挿入するガイド用鋼材を保持できる
深さだけは必要である。埋め戻し材の投入後に、好まし
くは振動杭打ち機等でガイド用鋼材を孔中に挿入する。In parallel with the drilling work, or when a predetermined number of holes have been drilled, a backfill material is introduced into the drilled holes to a predetermined depth. The backfill depth is arbitrary, but at least a depth sufficient to hold the guide steel material to be inserted later is required. After charging the backfill material, preferably, a guide steel material is inserted into the hole by a vibrating pile driver or the like.
【００１１】隣り合う２本の削孔中にガイド用鋼材を挿
入した後に、あるいは、さらに多数本の掘削孔中にガイ
ド用鋼材を挿入した後に、再び、掘削軸を装備した掘削
機を用いて、孔と孔との間を掘削する。この掘削時に
は、掘削軸の両サイドは予め挿入してあるガイド用鋼材
によって確保されているために、掘削時に掘削軸が左右
の既削孔側に逃げることはなく、垂直状に所定の削孔が
行われる。After inserting the guide steel material into two adjacent holes, or after inserting the guide steel material into a larger number of excavation holes, the excavator equipped with the excavation shaft is used again. Drill between the holes. During this excavation, both sides of the excavation shaft are secured by the guide steel material that has been inserted in advance, so the excavation shaft does not escape to the left and right drilled hole side during excavation, and the vertical drilling Is done.
【００１２】予定された削孔を終了した時点で、必要に
応じて、後で削孔した孔にも埋め戻し材を投入した後、
適宜の作業機（例えは振動杭打ち機）により、先に挿入
したガイド用鋼材を引き抜くことにより、本発明による
連続地中孔の施工は終了する。その後、必要に応じて、
形成された連続地中孔に応力負担材としての鋼矢板等が
打ち込まれる。At the time when the planned drilling is completed, if necessary, after filling backfill material into the drilled holes,
The construction of the continuous underground hole according to the present invention is completed by pulling out the previously inserted guide steel material with an appropriate working machine (for example, a vibration pile driving machine). Then, if necessary,
A steel sheet pile or the like as a stress bearing material is driven into the formed continuous underground hole.
【００１３】実施に際して、先端にダウンハンマーを装
着した掘削軸を用いて削孔することにより、転石層、岩
盤等の硬い地盤と柔らかい地層とが層状に混在している
ような区域においても、連続地中孔を高い精度で形成す
ることが可能となり、鋼矢板の打ち込みも容易となりか
つ打ち込み精度も高くなる。なお、連続地中孔は全体と
して直線状に連続したものとして形成してもよく、屈曲
あるいは湾曲したしたものとして形成することもでき
る。[0013] In carrying out the method, by drilling with a drilling shaft having a down hammer at the tip, continuous formation is possible even in an area where hard ground such as boulders and rocks and soft ground are mixed in layers. The underground hole can be formed with high accuracy, the driving of the steel sheet pile is facilitated, and the driving accuracy is improved. In addition, the continuous underground hole may be formed as a straight continuous shape as a whole, or may be formed as a bent or curved shape.
【００１４】[0014]
【実施例】以下、実施例により本発明をより詳細に説明
する。先ず、本発明による連続地中孔の施工方法を実施
するのに好適に用いることのできる地下穿孔機の一例を
図１を参照して説明する。この地下穿孔機は、車両１の
案内台２に沿い移動する回転機４の下部に流体供給装置
５を介して掘削軸３が装着され、該掘削軸３の下端にダ
ウンハンマーＤが装着されている。そして、掘削軸３は
発電機Ｇにより駆動される回転機４により回転する。ま
た、掘削軸３には、その中央部に流体供給機Ｓから供給
される流体を前記回転機４を通じてダウンハンマーＤま
で受け渡すための図示しない流体通路が形成され、さら
に、エアーコンプレッサーＣからの圧搾空気を流体供給
装置５を通じてダウンハンマーＤまで受け渡すための図
示しない圧搾空気通路が形成されている。詳しくは、本
出願人の出願に係る特開平６−２１２８７０号公報ある
いは特開平７−４１６６号公報が参照される。この装置
によれば、ダウンハンマーＢの作動により転石層、岩盤
等の硬い地盤が存在する場所であっても容易に削孔が可
能はであり、また、流体供給装置から土質改良剤等を放
出することにより、削孔の崩壊もある程度防ぐことがで
きる。The present invention will be described in more detail with reference to the following examples. First, an example of an underground drilling machine that can be suitably used to carry out the method for constructing a continuous underground hole according to the present invention will be described with reference to FIG. In this underground drilling machine, an excavation shaft 3 is attached to a lower part of a rotating machine 4 that moves along a guide table 2 of a vehicle 1 via a fluid supply device 5, and a down hammer D is attached to a lower end of the excavation shaft 3. There is. Then, the excavation shaft 3 is rotated by the rotating machine 4 driven by the generator G. Further, the excavation shaft 3 is provided with a fluid passage (not shown) at its central portion for passing the fluid supplied from the fluid feeder S to the down hammer D through the rotary machine 4, and further, from the air compressor C. A compressed air passage (not shown) for transferring the compressed air to the down hammer D through the fluid supply device 5 is formed. For details, refer to Japanese Patent Application Laid-Open No. 6-212870 or Japanese Patent Application Laid-Open No. 7-4166 filed by the present applicant. According to this device, the operation of the down hammer B enables easy drilling even in a place where hard ground such as boulders, rocks, etc. exists, and the soil supply agent is released from the fluid supply device. By doing so, it is possible to prevent collapse of the drilled holes to some extent.
【００１５】このような地下穿孔機（掘削軸径６３０ｍ
ｍ）を用いて幅５００ｍｍの鋼矢板を打ち込むための連
続地中孔を削孔する場合を例にとり説明する。削孔に際
して、好ましくは、図２に示すようなガイド定規Ｍを用
意する。これは、地下穿孔機により最初に削孔すべき目
標位置を地面上に印すためのものであり、直径６３０ｍ
ｍの円板ａ1 〜ａ3 が中心間ピッチ１０００ｍｍで３
個、基板ｂに一体に形成されており、基板ｂの両端は左
右に位置する円板ａ1 及びａ3 の中心Ｏ1 、Ｏ3からそ
れぞれ左右に５００ｍｍ離れた位置まで延出している。
作業者は地表面にこのガイド定規Ｍを置きチョーク等を
用いて定規の（少なくとも円板ａ1 〜ａ3部分の）外形
を地表面に印す。その後、ガイド定規Ｍを側方に移動し
て基板ｂの端部を先に印した基板形状の基部の端部に合
わせ、再び定規の外形を地表面に印す。以下、連続地中
孔を形成する予定距離にわたって繰り返す。そのように
することにより、地表面には、直径６３０ｍｍの円がピ
ッチ１０００ｍｍの間隔で連続的に描かれる。Such an underground drilling machine (excavation shaft diameter 630 m
The case of drilling a continuous underground hole for driving a steel sheet pile having a width of 500 mm by using m) will be described as an example. At the time of drilling, preferably, a guide ruler M as shown in FIG. 2 is prepared. This is for marking the target position on the ground that should be drilled first by the underground drilling machine.
Disks a 1 to a 3 of m are 3 with a center-to-center pitch of 1000 mm.
Each of them is formed integrally with the substrate b, and both ends of the substrate b extend to the positions separated by 500 mm from the centers O 1 and O 3 of the disks a 1 and a 3 located on the left and right.
The operator places the guide ruler M on the ground surface and marks the contour of the ruler (at least the portions of the disks a 1 to a 3 ) on the ground surface with a chalk or the like. After that, the guide ruler M is moved laterally so that the end of the substrate b is aligned with the end of the base of the previously marked substrate shape, and the contour of the ruler is again marked on the ground surface. Hereinafter, it repeats over the planned distance for forming the continuous underground hole. By doing so, circles with a diameter of 630 mm are continuously drawn on the ground surface at intervals of a pitch of 1000 mm.
【００１６】次に、地下穿孔機を移動して掘削軸３を先
に印した円板ａ1 の位置に合わせ、通常の方法により所
定の深さまで削孔し、孔Ａ1 を形成する。削孔後、掘削
軸３を引き抜き（図１）、円板ａ2 の位置に移動して再
度削孔する。以下、この作業を順次繰り返す。それによ
り、直径６３０ｍｍの地中孔がピッチ１０００ｍｍの間
隔で、すなわち非連続の状態で、所要数（Ａ1 、Ａ2 、
・・・・）形成される（図４）。Next, the underground boring machine is moved to align the excavation shaft 3 with the position of the previously marked disc a 1 , and a hole is drilled to a predetermined depth by a usual method to form the hole A 1 . After drilling, the excavation shaft 3 is pulled out (FIG. 1), moved to the position of the disk a 2 and drilled again. Hereinafter, this work is sequentially repeated. As a result, the required number of holes (A 1 , A 2 ,
..) formed (FIG. 4).
【００１７】この削孔作業と平行して（あるいは、削孔
作業を終えた後に）、孔の中に埋め戻し材Ｃを投入する
（図５）。その際に、開口部に図５に示すような漏斗Ｒ
を配置することは有効である。この埋め戻し材Ｃは、例
えば栗石地盤での削孔部のように周囲の振動により孔中
に周囲の砕石等が入り込むのを防止して、次の作業であ
るガイド用鋼材の挿入を確保すると共に、挿入されたガ
イド用鋼材を保持するためのものであり、ガイド用鋼材
の打設手段等を考慮して、適宜の深さまで投入される。In parallel with this drilling work (or after finishing the drilling work), the backfill material C is put into the hole (FIG. 5). At that time, the funnel R as shown in FIG.
It is effective to arrange. This backfill material C prevents the surrounding crushed stones from entering into the hole due to the vibration of the periphery, for example, in the case of the drilled portion in the quarry stone ground, and ensures the insertion of the guide steel material in the next work. At the same time, it is for holding the inserted guide steel material, and is introduced to an appropriate depth in consideration of the means for placing the guide steel material.
【００１８】埋め戻し材を投入した孔の中に、好ましく
は振動杭打ち機Ｖを用いてガイド用鋼材Ｈを順次挿入す
る（図３）。ガイド用鋼材Ｈは埋め戻し材Ｃ内を通って
孔底部にまで達し、そこで、埋め戻し材Ｃにより支持さ
れて安定的に保持される。ガイド用鋼材ＨはＨ型鋼が望
ましく、図６ｂにガイド用鋼材Ｈ挿入後の状態の上面図
を示すように、その長手方向の幅広部（フランジ部）ｈ
を孔Ａ1 、Ａ2 ・・の連続方向に向けた姿勢で挿入する
ことが望ましい。また、ガイド用鋼材Ｈの横幅ｗは、図
６ｂに示すように近接する孔にガイド用鋼材Ｈを挿入し
た時に、近接するガイド用鋼材Ｈのフランジｈ間の距離
Ｌが６３０ｍｍ、すなわち、掘削軸の直径にほぼ等しい
かそれより幾分幅広となるように寸法のものを選択す
る。この実施例では、３７０ｍｍよりも幾分狭い幅のも
のを用いるのが最適である。The guide steel material H is sequentially inserted into the holes filled with the backfill material, preferably by using a vibrating pile driver V (FIG. 3). The guide steel material H passes through the backfill material C and reaches the bottom of the hole, where it is supported and stably held by the backfill material C. It is desirable that the guide steel material H is H-shaped steel, and as shown in the top view of the state after the guide steel material H is inserted in FIG. 6b, a wide portion (flange portion) h in the longitudinal direction thereof.
It is desirable that the holes be inserted in a posture in which the holes A 1 , A 2, ... Further, the lateral width w of the guide steel material H is such that the distance L between the flanges h of the guide steel material H adjacent to each other is 630 mm when the guide steel material H is inserted into the adjacent holes as shown in FIG. Choose a size that is approximately equal to or slightly wider than the diameter of. In this embodiment, it is best to use a width that is somewhat narrower than 370 mm.
【００１９】次に、先に削孔した孔と孔の間、例えば孔
Ａ1 と孔Ａ2 間の中央に同じ掘削軸を用いて追加削孔を
行う。図７は、追加削孔後の状態を示す上面図であり、
追加削孔で形成された孔Ｔ1 、Ｔ2 ・・は、先に形成し
た孔Ａ1 、Ａ2 ・・に一部重複した状態で形成されるこ
とは理解されよう。先に削孔してある孔Ａ1 、孔Ａ2・
・にはガイド用鋼材Ｈが挿入されており、かつ、ガイド
用鋼材Ｈは埋め戻し材Ｃにより安定的に保持されている
ので、追加孔Ｔ1 を削孔する場合であっても、掘削軸は
既設の孔（孔Ａ1 と孔Ａ2 ）方向に縒れることなく、ガ
イド用鋼材Ｈにより左右を支持された状態で安定的にか
つ高い精度での削孔が可能となる。Next, additional drilling is performed between the previously drilled holes, for example, in the center between the holes A 1 and A 2 by using the same drilling shaft. FIG. 7 is a top view showing a state after additional drilling,
It will be understood that the holes T 1 , T 2 ... Formed by the additional drilling are formed so as to partially overlap the holes A 1 , A 2 ... Formed previously. Pre-drilled hole A 1 , hole A 2
Since the guide steel material H is inserted in and the guide steel material H is stably held by the backfill material C, even if the additional hole T 1 is drilled, Can be stably and highly accurately drilled without being twisted in the direction of the existing holes (hole A 1 and hole A 2 ), while being supported by the guide steel material H on both sides.
【００２０】好ましくは、追加孔Ｔ1 Ｔ2 ・・に対して
も先に孔Ａ1 、孔Ａ2 ・・に対して行ったと同様に埋め
戻し材を投入し、その後に、孔Ａ1 、孔Ａ2 ・・に挿入
しておいたガイド用鋼材Ｈを順次引き抜く。それによ
り、直径６３０ｍｍの地中孔が中心ピッチ５００ｍｍの
間隔で、連続地中孔として形成される。ガイド用鋼材Ｈ
を引き抜いた孔Ａ1 、Ｔ1 、Ａ2 Ｔ2 ・・に、応力負担
材としての幅５００ｍｍの鋼矢板Ｙ・・を適宜の振動杭
打ち機等を用いて打設する。孔内には埋め戻し材Ｃが充
填されており、ガイド用鋼材Ｈの引き抜き時及び鋼矢板
Ｙの打ち込み時に、振動により周囲の砕石等が孔中に入
り混むことは阻止されるので、打ち込みが容易であり、
また、一旦打ち込んだ鋼矢板Ｙは埋め戻し材Ｃにより仮
に保持されるので、連接した孔矢板Ｙ・・の打ち込みも
容易となり、また、矢板打ち込み後の後作業も容易とな
る。Preferably, the backfill material is added to the additional holes T 1 T 2 ··· in the same manner as the holes A 1 and A 2 ···, and then the holes A 1 , The guide steel material H inserted in the holes A 2 ··· is sequentially pulled out. As a result, underground holes having a diameter of 630 mm are formed as continuous underground holes at a center pitch of 500 mm. Steel material for guide H
A steel sheet pile Y having a width of 500 mm as a stress-bearing member is driven into the holes A 1 , T 1 , A 2 T 2 ... The backfill material C is filled in the hole, and when the guide steel material H is pulled out and the steel sheet pile Y is driven, it is prevented that surrounding crushed stones and the like enter into the hole due to vibration, and therefore the driving is performed. Easy and
Further, since the steel sheet pile Y that has been hammered in is temporarily held by the backfill material C, the punched hole sheet piles Y, ... Can be driven easily, and the post-working after the sheet pile driving is also facilitated.
【００２１】なお、上記の説明は本発明による連続地中
孔の施工方法の一実施例の説明に過ぎず、多くの変形例
が存在する。例えば、図示したようなガイド定規Ｍを用
いことは本発明において必須でなく、何らかの手段によ
り所定間隔の目印を地表面に付すことができればよく、
単なるメジャーによってもよい。また、装置の操作が確
実な場合には、特に目印を付すことなく削孔を行っても
よい。ダウンハンマーを持つ掘削軸を用いることも必須
でなく、地盤が比較的柔らかい場所での作業時には、通
常の掘削軸を用いて作業を行うこともできる。The above description is merely one example of the method of constructing a continuous underground hole according to the present invention, and there are many variations. For example, it is not essential in the present invention to use the guide ruler M as shown in the present invention, as long as it is possible to mark the ground surface at predetermined intervals by some means,
It may be just a measure. Further, when the operation of the device is reliable, the holes may be drilled without adding a mark. It is not essential to use an excavating shaft having a down hammer, and when working in a place where the ground is relatively soft, it is also possible to perform work using a normal excavating shaft.
【００２２】ガイド用鋼材もＨ型鋼に限らず、追加孔削
孔時に掘削軸のガイドとしての機能を果たせるものであ
ればよく、Ｉ型鋼やＵ型鋼、矩形鋼材等も用い得る。ま
た、前記追加孔の削孔を最初の不連続状の孔を削孔した
と同じ掘削装置により行うことは必ずしも必須でなく、
別の掘削装置により行ってもよい。また、不連続状の孔
と追加孔とを同じ口径とすることも必須でなく、施工現
場の地盤の状況に応じて異なった径のものを形成するよ
うにしてもよい。不連続状の孔群の中心間ピッチをどの
程度するも、地盤の状況と用いるガイド用鋼材の寸法等
を効力して適宜決定すればよい。The guide steel material is not limited to the H-shaped steel, and any material can be used as long as it can function as a guide for the excavation shaft at the time of additional hole drilling, and I-shaped steel, U-shaped steel, rectangular steel or the like can be used. Further, it is not always necessary to perform the drilling of the additional hole by the same drilling device as the drilling of the first discontinuous hole,
It may be performed by another drilling device. Further, it is not essential that the discontinuous hole and the additional hole have the same diameter, and different diameters may be formed according to the situation of the ground at the construction site. No matter what the pitch between the centers of the discontinuous holes is set, it may be appropriately determined in consideration of the condition of the ground and the size of the guide steel material used.
【００２３】[0023]
【発明の効果】本発明によれば、高い精度の連続地中孔
を容易に形成することができ、特に、ダウンハンマーを
先端に備えた掘削軸を用いる場合には、転石層、岩盤等
の硬い地盤が存在する地域に対しても連続した地中孔を
高い精度で形成することができる。EFFECTS OF THE INVENTION According to the present invention, it is possible to easily form a highly accurate continuous underground hole, and especially when using an excavating shaft equipped with a down hammer at the tip, a rock layer, rock mass, etc. It is possible to form a continuous underground hole with high accuracy even in an area where hard ground exists.
【図１】本発明の実施に用いるのに好適な掘削機の一例
を示す図。FIG. 1 is a diagram showing an example of an excavator suitable for use in implementing the present invention.
【図２】本発明の実施に用いるのに好適なガイド定規を
説明する図。FIG. 2 is a diagram illustrating a guide ruler suitable for use in implementing the present invention.
【図３】本発明による連続地中孔の施工方法での第１工
程の削孔を説明する図。FIG. 3 is a diagram illustrating drilling in the first step in the method of constructing a continuous underground hole according to the present invention.
【図４】第１工程で削孔された孔の状態を示す上面図。FIG. 4 is a top view showing a state of holes drilled in the first step.
【図５】埋め戻し材を孔中に投入した状態を説明する
図。FIG. 5 is a diagram illustrating a state in which a backfill material is put into a hole.
【図６】ガイド用鋼材の挿入態様を説明する図。FIG. 6 is a diagram illustrating an insertion mode of a guide steel material.
【図７】追加孔の削孔状態を示す上面図。FIG. 7 is a top view showing a drilled state of additional holes.
【図８】本発明による施工方法により形成された連続地
中孔に連続して鋼矢板を打ち込んだ状態を示す上面図。FIG. 8 is a top view showing a state where steel sheet piles are continuously driven into continuous underground holes formed by the construction method according to the present invention.
Ａ1 ・・…所定の間隔をおいて最初に削孔される孔群 Ｈ …孔Ａ1 ・・に挿入されるガイド用鋼材 Ｔ1 ・・…孔Ａ1 ・・にガイド用鋼材を挿入後、削孔さ
れる追加孔 Ｃ …埋め戻し材A 1 · · ... After inserting a first guiding steel T 1 · · ... guide steel into the hole A 1 · · to be inserted into the hole groups H ... hole A 1 · · which is drilled at predetermined intervals , Additional hole to be drilled C ... Backfill material
Claims (3)
を装備した掘削機を用いて複数個の地中孔を所定ピッチ
でかつ不連続状に削孔し、該削孔された孔を埋め戻し材
により一部埋め戻し、該一部埋め戻した孔中にガイドと
なる鋼材を挿入し、該鋼材を挿入した相隣る孔の間をさ
らに削孔して連続した地中孔とし、必要に応じて、後者
の削孔の一部を埋め戻し材により埋め戻した後、先に挿
入した鋼材を引き抜くことを特徴とする連続地中孔の施
工方法。1. A method of constructing a continuous underground hole, wherein a plurality of underground holes are drilled at a predetermined pitch and discontinuously by using an excavator equipped with an excavating shaft, and the holes are drilled. The hole is partially backfilled with a backfill material, a steel material serving as a guide is inserted into the partially backfilled hole, and a hole is further drilled between adjacent holes into which the steel material has been inserted to form a continuous underground hole The method for constructing a continuous underground hole is characterized in that, if necessary, the latter part of the drilled hole is backfilled with a backfilling material, and then the steel material inserted earlier is pulled out.
備した掘削機を用いて削孔を行うことを特徴とする請求
項１記載の連続地中孔の施工方法。2. The method for constructing a continuous underground hole according to claim 1, wherein the boring is performed by using an excavator equipped with an excavating shaft having a down hammer at the tip.
連続地中孔に鋼矢板等を打設することをさらに含むこと
を特徴とする請求項１又は２記載の連続地中孔の施工方
法。3. The method for constructing a continuous underground hole according to claim 1, further comprising, after drawing out the steel material, driving a steel sheet pile or the like into the formed continuous underground hole. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16981395A JPH0921131A (en) | 1995-07-05 | 1995-07-05 | Construction of continuous underground hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16981395A JPH0921131A (en) | 1995-07-05 | 1995-07-05 | Construction of continuous underground hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0921131A true JPH0921131A (en) | 1997-01-21 |
Family
ID=15893382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16981395A Pending JPH0921131A (en) | 1995-07-05 | 1995-07-05 | Construction of continuous underground hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0921131A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101432661B1 (en) * | 2012-12-18 | 2014-08-25 | (주) 금산 압입 | Method for installing a structure at rock layer |
| JP2016199966A (en) * | 2015-04-14 | 2016-12-01 | 新日鐵住金株式会社 | Pile hole excavation method |
| JP2017141607A (en) * | 2016-02-10 | 2017-08-17 | 清水建設株式会社 | Ground improvement method |
| WO2020105260A1 (en) * | 2018-11-19 | 2020-05-28 | 株式会社小松製作所 | System and method for automatically controlling work machinery including work machine |
-
1995
- 1995-07-05 JP JP16981395A patent/JPH0921131A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101432661B1 (en) * | 2012-12-18 | 2014-08-25 | (주) 금산 압입 | Method for installing a structure at rock layer |
| JP2016199966A (en) * | 2015-04-14 | 2016-12-01 | 新日鐵住金株式会社 | Pile hole excavation method |
| JP2017141607A (en) * | 2016-02-10 | 2017-08-17 | 清水建設株式会社 | Ground improvement method |
| WO2020105260A1 (en) * | 2018-11-19 | 2020-05-28 | 株式会社小松製作所 | System and method for automatically controlling work machinery including work machine |
| AU2019383158B2 (en) * | 2018-11-19 | 2022-02-10 | Komatsu Ltd. | System and method for automatically controlling work machine including work implement |
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