JPH11117678A - Buckling-preventing jig for jacking rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent buckling of a jacking rod by stretching a beam member for supporting a ring-like bending regulating member for limiting bending of an inserted jacking rod over between the opposite side wall surfaces substantially parallel to the advancing direction of the jacking rod in a starting shaft, and adjusting the support position in the stretching direction. SOLUTION: A rectilinear beam member 21 can be adjusted in its axial length by a handle 23 provided on one side in the axial direction, and a ring-like bending regulating member 20 for limiting bending of an inserted jacking rod 28 is supported by a support member 22. The support member 22 can be moved in the axial direction of the beam member 21 and fixed at an arbitrary position. Holding plates 24, 25 are respectively provided on both ends in the axial direction of the beam member 21, and allowed to contact the surface of a sheet pile for retaining the side of a starting shaft. The bending regulating member can be split into two, upper and lower parts, the upper side and the lower side are connected to each other by a connecting part 26, and when the other end connecting part 27 is opened, the jacking rod 28 is enveloped.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、非開削工法によっ
てポリエチレンなどの合成樹脂管を地盤中に引き込んで
地中に埋設するために、推進ロッドを地盤中に押し込む
際に、座屈を防止する推進ロッドの座屈防止治具に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent buckling when pushing a propulsion rod into the ground in order to pull a synthetic resin pipe such as polyethylene into the ground and bury it in the ground by a non-cutting method. The present invention relates to a jig for preventing buckling of a propulsion rod.

【０００２】[0002]

【従来の技術】従来から、図４および図５に示すような
施工手順で、ポリエチレン管などの地中への敷設が行わ
れている。道路などの地表面１から地盤２に対して、発
進立坑３および到達立坑４を掘削しておく。発進立坑３
の近傍から推進ロッド５を地盤２中に押し込む。地盤２
中に押し込まれた推進ロッド５は、地表面１付近では地
表面に対して傾斜した角度であり、発進立坑３内で推進
方向がほぼ水平となるように曲がってから地盤２中に押
し込まれる。2. Description of the Related Art Conventionally, polyethylene pipes and the like have been laid underground by construction procedures shown in FIGS. The starting shaft 3 and the reaching shaft 4 are excavated from the ground surface 1 such as a road to the ground 2. Start shaft 3
Is pushed into the ground 2 from the vicinity of. Ground 2
The propulsion rod 5 pushed in is inclined at an angle with respect to the ground surface near the ground surface 1, bends so that the propulsion direction is substantially horizontal in the starting shaft 3, and is then pushed into the ground 2.

【０００３】地盤２中で、推進ロッド５の先端にはドリ
ルヘッド６が設けられる。ドリルヘッド６からは、泥水
が噴出し、周囲の地盤２を軟化させ、地盤２中でのドリ
ルヘッド６の推進方向への前進が可能となるようにして
いる。推進ロッド５は、２〜３ｍの長さを有する鋼鉄管
であり、推進すべき距離に応じて継ぎ足されながら、ガ
イドドリルユニット７から地表面１に向けて傾斜した角
度で押し込まれる。ガイドドリルユニット７には、近接
して設けられるパワーユニット８から動作用の油圧や電
力などが供給される。推進ロッド５の先端に設けられる
ドリルヘッド７の位置を地表面１から確認するため、ド
リルヘッド６の近傍には磁界発生器９を設け、地表面１
から検出コイル１０で磁界を検出するようにしている。[0003] A drill head 6 is provided at the tip of the propulsion rod 5 in the ground 2. From the drill head 6, muddy water is spouted to soften the surrounding ground 2 so that the drill head 6 can advance in the propulsion direction in the ground 2. The propulsion rod 5 is a steel tube having a length of 2 to 3 m, and is pushed from the guide drill unit 7 toward the ground surface 1 at an inclined angle while being extended according to the distance to be propelled. The guide drill unit 7 is supplied with operating hydraulic pressure, electric power, and the like from a power unit 8 provided in the vicinity. In order to confirm the position of the drill head 7 provided at the tip of the propulsion rod 5 from the ground surface 1, a magnetic field generator 9 is provided near the drill head 6,
The detection coil 10 detects the magnetic field.

【０００４】図５は、ドリルヘッド６が到達立坑４に到
達し、ポリエチレン管１１の先端をドリルヘッド９で掴
み、ガイドドリルユニット７が推進ロッド５を地盤２か
ら引き抜きながら個々の推進ロッドに分解する状態を示
す。ポリエチレン管１１は、可撓性があるので、リール
１２に巻かれた状態で使用される。推進ロッド５の直径
はたとえば５０ｍｍ程度である。これに対してポリエチ
レン管１１の直径は、たとえば２００ｍｍである。発進
立坑３から到達立坑４までの距離は、たとえば５０〜１
００ｍである。図４および図５に示すような施工方法に
よれば、非開削でポリエチレン管１１を、比較的長距離
にわたって敷設することができる。FIG. 5 shows that the drill head 6 reaches the reaching shaft 4, the tip of the polyethylene pipe 11 is grasped by the drill head 9, and the guide drill unit 7 disassembles the individual propulsion rods while pulling the propulsion rod 5 out of the ground 2. Indicates a state in which Since the polyethylene tube 11 is flexible, it is used while being wound on a reel 12. The diameter of the propulsion rod 5 is, for example, about 50 mm. On the other hand, the diameter of the polyethylene tube 11 is, for example, 200 mm. The distance from the starting shaft 3 to the reaching shaft 4 is, for example, 50 to 1
00m. According to the construction method shown in FIGS. 4 and 5, the polyethylene pipe 11 can be laid over a relatively long distance without cutting.

【０００５】[0005]

【発明が解決しようとする課題】図４に示すような推進
ロッド５の地盤２中への押し込み時には、推進ロッド５
にガイドドリルユニット７から大きな推進力が加えられ
る。推進ロッド５のうち、地盤２中に挿入されている部
分は、周囲の地盤２からの圧力で拘束され、推進方向と
は異なる方向に変位しにくいけれども、発進立坑３内の
推進ロッド５は、推進方向に垂直な横方向にも曲がりや
すい。このため、長距離にわたって推進するために、ガ
イドドリルユニット７から大きな力で押し込まれると、
発進立坑３内で推進ロッド５は座屈しやすくなる。When the propulsion rod 5 is pushed into the ground 2 as shown in FIG.
, A large propulsive force is applied from the guide drill unit 7. The portion of the propulsion rod 5 inserted into the ground 2 is restrained by the pressure from the surrounding ground 2 and is hardly displaced in a direction different from the propulsion direction, but the propulsion rod 5 in the starting shaft 3 is It is easy to bend in the horizontal direction perpendicular to the propulsion direction. For this reason, when propelled from the guide drill unit 7 with a large force in order to propel it over a long distance,
The propulsion rod 5 is easily buckled in the starting shaft 3.

【０００６】推進ロッド５が座屈すると、弾性限度を超
えて変形してしまい、推進力を緩めても変形状態が元に
戻らなくなったり、甚だしい場合は破損したりすること
もあり得る。したがって座屈が生じてしまうと、座屈部
分を引き戻して取外し、健全な推進ロッド５と交換する
必要がある。このとき座屈を生じた推進ロッド５よりも
ドリルヘッド６側の推進ロッド５は、途中で一旦引き抜
かれ、新たな推進ロッド５を後部に継ぎ足してから再び
地盤２中に挿入される。このため、推進ロッド５に一旦
座屈が生じると、その回復のためには非常に手間がかか
ることになる。[0006] When the propulsion rod 5 buckles, it deforms beyond its elastic limit, and even if the propulsion force is loosened, the deformed state may not return to its original state, or may be damaged in severe cases. Therefore, when buckling occurs, it is necessary to pull back and remove the buckled portion and replace it with a sound propulsion rod 5. At this time, the propulsion rod 5 closer to the drill head 6 than the buckled propulsion rod 5 is once pulled out in the middle, a new propulsion rod 5 is added to the rear part, and then inserted into the ground 2 again. For this reason, once buckling occurs in the propulsion rod 5, it takes much time and effort to recover the buckling.

【０００７】本発明の目的は、推進ロッドの座屈を防ぐ
ことができ、推進工法を効率よく実行することができる
推進ロッドの座屈防止治具を提供することである。It is an object of the present invention to provide a buckling prevention jig for a propulsion rod which can prevent buckling of the propulsion rod and can efficiently execute a propulsion method.

【０００８】[0008]

【課題を解決するための手段】本発明は、発進立坑近傍
の地表面から地盤中に押し込まれ、発進立坑から到達立
坑まで先端のドリルヘッドを推進させた後、到達立坑か
ら合成樹脂製管を地盤中に引き込むための推進ロッド
が、発進立坑内で座屈することを防止するための治具で
あって、推進ロッドが挿入され、推進ロッドの撓みを、
予め定める範囲に制限する内径を有するリング状の撓み
規制部材と、発進立坑内で、推進ロッドの推進方向にほ
ぼ平行な相対向する側壁面間に架け渡され、撓み規制部
材を支持して、架け渡し方向に支持位置が調整可能な梁
部材とを含むことを特徴とする推進ロッドの座屈防止方
法である。SUMMARY OF THE INVENTION According to the present invention, a synthetic resin tube is pushed from the ground surface near the starting shaft into the ground, and the tip of the drill head is propelled from the starting shaft to the reaching shaft. A propulsion rod for drawing into the ground is a jig for preventing buckling in the starting shaft, in which the propulsion rod is inserted and the bending of the propulsion rod is reduced.
A ring-shaped deflection restricting member having an inner diameter limited to a predetermined range, and, in the starting shaft, are bridged between opposing side wall surfaces substantially parallel to the propulsion direction of the propulsion rod, supporting the deflection restriction member, A buckling prevention method for a propulsion rod, comprising a beam member whose support position can be adjusted in a bridging direction.

【０００９】本発明に従えば、発進立坑内で梁部材に撓
み規制部材が支持位置の調整可能な状態で支持される。
梁部材は、発進立坑の推進方向にほぼ平行な相対向する
側壁面間に架け渡されるので、撓み規制部材は推進方向
にほぼ垂直な平面内で位置調整が可能である。撓み規制
部材は、リング状であり、その内径は推進ロッドの撓み
を予め定める範囲内に規制するように決定される。すな
わち、一旦撓みが発生しても、撓みの最大値が制限され
るので、座屈の進展が食い止められる。実際に座屈が生
じているような場合に必要になる途中からの推進ロッド
５の引き戻しや交換などの作業は不要となり、効率よく
推進工法による施工を行うことができる。According to the present invention, the deflection regulating member is supported by the beam member in the starting shaft in a state where the supporting position can be adjusted.
Since the beam member is bridged between the opposing side wall surfaces substantially parallel to the propulsion direction of the starting shaft, the deflection regulating member can be adjusted in position in a plane substantially perpendicular to the propulsion direction. The deflection regulating member has a ring shape, and its inner diameter is determined so as to regulate the deflection of the propulsion rod within a predetermined range. That is, even if the bending occurs once, the maximum value of the bending is limited, so that the buckling is prevented from progressing. Work such as pulling back and replacing the propulsion rod 5 which is required in the case where buckling actually occurs is not necessary, and construction by the propulsion method can be performed efficiently.

【００１０】[0010]

【発明の実施の形態】図１は、本発明の実施の一形態と
しての座屈防止治具の概略的な構成を示す。撓み規制部
材２０は大略的にリング状であり、梁部材２１は、横方
向に延びて直線状の形状を有し、支持部材２２で撓み規
制部材２０を支持する。支持部材２２は、梁部材２１の
軸線方向に移動可能で、任意の位置に固定可能である。
梁部材２１は、軸線方向の一方に設けるハンドル２３に
よって、軸線方向の長さが調整可能である。梁部材２１
の軸線方向の両端には保持板２４，２５がそれぞれ設け
られ、発進立坑の側面の土止めを行う矢板などの表面に
当接する。FIG. 1 shows a schematic configuration of a buckling prevention jig as one embodiment of the present invention. The deflection control member 20 is substantially ring-shaped, and the beam member 21 extends in the lateral direction and has a linear shape, and the support member 22 supports the deflection control member 20. The support member 22 is movable in the axial direction of the beam member 21 and can be fixed at an arbitrary position.
The length of the beam member 21 in the axial direction can be adjusted by a handle 23 provided on one side in the axial direction. Beam member 21
Holding plates 24 and 25 are provided at both ends in the axial direction of the shaft, respectively, and abut against the surface of a sheet pile or the like for closing the side surface of the starting shaft.

【００１１】撓み規制部材２０は、大略的にリング状で
あり、上側と下側との２つの部分に分解可能である。上
側と下側との間は、連結部２６によって連結され、他端
側の結合部２７を開けば、推進ロッド２８を外囲する状
態とすることができる。連結部２６および結合部２７を
設けなくても、推進ロッド２８の先端のドリルヘッドか
ら挿入すれば、撓み規制部材２０に推進ロッド２８を挿
入することができる。The deflection restricting member 20 is substantially ring-shaped and can be disassembled into two parts, an upper part and a lower part. The upper side and the lower side are connected by a connecting portion 26, and when the connecting portion 27 on the other end side is opened, it is possible to surround the propulsion rod 28. Even if the connecting portion 26 and the connecting portion 27 are not provided, if the propulsion rod 28 is inserted from the drill head at the tip of the propulsion rod 28, the propulsion rod 28 can be inserted into the deflection control member 20.

【００１２】図２は、図１に示す座屈防止治具を発進立
坑３０内に設置している状態を示す。発進立坑３０で
は、側面の矢板３１，３２間に梁部材２１を架け渡すこ
とができる。梁部材２１は、外筒３３と内筒３４とから
成り、外筒３３の内側に形成されているねじ３５に、内
筒３４の外側に形成されている外ねじ３６が螺合する。
外筒３３に設けられるハンドル２３を用いて外筒３３を
軸線まわりに角変位させると、ねじ３５，３６によっ
て、外筒３３に対して内筒３４を軸線方向に変位させる
ことができる。外筒３３および内筒３４の長さはそれぞ
れ８００ｍｍ程度であるので、梁部材２１の全体的な長
さは、８００〜１５００ｍｍ程度の範囲に調整可能であ
る。このような長さが調整可能な梁部材２１は、発進立
坑３０内で、切りばりとして両側面の矢板３１，３２の
表面を強く押圧し、この両側へのつっぱり力で撓み規制
部材２０を発進立坑３０内の空間で保持する。FIG. 2 shows a state in which the buckling prevention jig shown in FIG. 1 is installed in the starting shaft 30. In the starting shaft 30, the beam member 21 can be bridged between the side sheet piles 31 and 32. The beam member 21 includes an outer cylinder 33 and an inner cylinder 34, and an external screw 36 formed outside the inner cylinder 34 is screwed to a screw 35 formed inside the outer cylinder 33.
When the outer cylinder 33 is angularly displaced around the axis using the handle 23 provided on the outer cylinder 33, the inner cylinder 34 can be displaced in the axial direction with respect to the outer cylinder 33 by the screws 35 and 36. Since the lengths of the outer cylinder 33 and the inner cylinder 34 are each about 800 mm, the overall length of the beam member 21 can be adjusted to a range of about 800 to 1500 mm. The beam member 21 having such an adjustable length strongly presses the surfaces of the sheet piles 31 and 32 on both sides as a cutout in the starting shaft 30, and starts the flexure restricting member 20 by the tension force on both sides. It is held in the space inside the shaft 30.

【００１３】撓み規制部材２０の内径は、たとえば１０
０ｍｍ程度にしておく。外径が４８ｍｍ程度の推進ロッ
ド２８を用いる場合に、撓み規制部材２０の内径と推進
ロッド２８の外径との差の半分の値までで撓みが規制さ
れ、推進ロッド２８の座屈防止を図ることができる。な
お、このように撓み規制部材２０の内径は、推進ロッド
２８の外径の約２倍としておくことによって、推進ロッ
ド２８の座屈を確実に防止することができる。The inner diameter of the deflection regulating member 20 is, for example, 10
Keep it at about 0 mm. When the propulsion rod 28 having an outer diameter of about 48 mm is used, the bending is restricted to half the difference between the inner diameter of the deflection control member 20 and the outer diameter of the propulsion rod 28, and the buckling of the propulsion rod 28 is prevented. be able to. By setting the inner diameter of the deflection restricting member 20 to about twice the outer diameter of the propulsion rod 28, buckling of the propulsion rod 28 can be reliably prevented.

【００１４】図３は、発進立坑３０内で推進ロッド２８
の途中を撓み規制部材２０に挿入して、座屈防止を図っ
ている状態を示す。図４に示すように、発進立坑内で推
進ロッドは、斜め下方に地盤２中に挿入されている状態
からほぼ水平方向に挿入される状態に曲がるので、この
変曲点付近が撓みやすい。この部分に撓み規制部材２０
を位置させれば、効果的に座屈防止を図ることができ
る。FIG. 3 shows that the propulsion rod 28
2 shows a state in which buckling is prevented by inserting the middle part of the buckling member into the deflection regulating member 20. As shown in FIG. 4, in the starting shaft, the propulsion rod bends obliquely downward from a state where it is inserted into the ground 2 to a state where it is inserted substantially in the horizontal direction. The deflection control member 20 is provided at this portion.
, Buckling can be effectively prevented.

【００１５】以上説明した実施形態では、推進ロッド２
０を図５に示すようなポリエチレン管１１を地中に引き
込むために推進させている。地中に引き込む対象となる
管は、ポリエチレン管ばかりではなく、他の可撓性を有
する合成樹脂管であれば同様に本発明を適用することが
できる。本発明のように地表面上から推進ロッド２８を
傾斜させた状態で地盤中に押し込む方法は、発進立坑内
に推進機を設置して、推進方向に推進ロッドを押し出す
推進工法に比較して、１本当たりの推進ロッドの長さが
長く、長距離の非開削による合成樹脂管の敷設を行うこ
とが容易である。In the embodiment described above, the propulsion rod 2
0 is propelled to draw a polyethylene tube 11 as shown in FIG. The present invention can be applied to not only polyethylene pipes but also other synthetic resin pipes having flexibility as the pipes to be pulled into the ground. The method of pushing the propulsion rod 28 into the ground in a state of being inclined from the ground surface as in the present invention is compared with a propulsion method in which a propulsion machine is installed in a starting shaft and the propulsion rod is pushed in the propulsion direction. The length of the propulsion rod per rod is long, and it is easy to lay a synthetic resin pipe by long-distance non-cutting.

【００１６】[0016]

【発明の効果】以上のように本発明によれば、発進立坑
内に簡単な構成の座屈防止治具を設けることによって、
推進ロッドが部分的に露出する発進立坑内で座屈しにく
く、推進ロッドに大きな押し込み力を与えて、効率よく
推進ロッドの地盤中への挿入を行うことができる。As described above, according to the present invention, by providing a buckling prevention jig having a simple structure in a starting shaft,
The propulsion rod is less likely to buckle in the start shaft where the propulsion rod is partially exposed, and a large pushing force is applied to the propulsion rod, so that the propulsion rod can be efficiently inserted into the ground.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施の一形態の座屈防止治具の正面図
である。FIG. 1 is a front view of a buckling prevention jig according to an embodiment of the present invention.

【図２】図１の座屈防止治具を発信立坑３０内に設置し
てある状態を示す正面断面図である。FIG. 2 is a front sectional view showing a state where the buckling prevention jig of FIG. 1 is installed in a transmission shaft 30.

【図３】図１の座屈防止治具を推進ロッドに装着してい
る状態を示す簡略化した斜視図である。FIG. 3 is a simplified perspective view showing a state in which the buckling prevention jig of FIG. 1 is mounted on a propulsion rod.

【図４】従来からの推進工法で推進ロッドを地盤中に押
し込む状態を示す斜視図である。FIG. 4 is a perspective view showing a state where a propulsion rod is pushed into the ground by a conventional propulsion method.

【図５】図４で地盤中に挿入された推進ロッドの先端で
ポリエチレン管を掴んで地盤中に引き込んで敷設する状
態を示す斜視図である。FIG. 5 is a perspective view showing a state in which a polyethylene pipe is gripped by the tip of a propulsion rod inserted into the ground in FIG. 4 and drawn into the ground to be laid.

【符号の説明】[Explanation of symbols]

２０ 撓み規制部材 ２１ 梁部材 ２２ 支持部材 ２３ ハンドル ２６ 連結部 ２７ 接合部 ２８ 推進ロッド ３０ 発進立坑 ３１，３２ 矢板 ３３ 外筒 ３４ 内筒 ３５，３６ ねじ DESCRIPTION OF SYMBOLS 20 Deflection control member 21 Beam member 22 Support member 23 Handle 26 Connecting part 27 Joint part 28 Propulsion rod 30 Starting shaft 31, 32 Yaita 33 Outer cylinder 34 Inner cylinder 35, 36 Screw

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 発進立坑近傍の地表面から地盤中に押し
込まれ、発進立坑から到達立坑まで先端のドリルヘッド
を推進させた後、到達立坑から合成樹脂製管を地盤中に
引き込むための推進ロッドが、発進立坑内で座屈するこ
とを防止するための治具であって、 推進ロッドが挿入され、推進ロッドの撓みを、予め定め
る範囲に制限する内径を有するリング状の撓み規制部材
と、 発進立坑内で、推進ロッドの推進方向にほぼ平行な相対
向する側壁面間に架け渡され、撓み規制部材を支持し
て、架け渡し方向に支持位置が調整可能な梁部材とを含
むことを特徴とする推進ロッドの座屈防止方法。1. A propulsion rod for pushing a drill head at the tip from a ground surface near a starting shaft into a ground from a starting shaft to a reaching shaft and then pulling a synthetic resin pipe from the reaching shaft into the ground. Is a jig for preventing buckling in a starting shaft, in which a propulsion rod is inserted, and a ring-shaped flexure restricting member having an inner diameter for restricting flexure of the propulsion rod to a predetermined range; And a beam member that is bridged between opposing side wall surfaces substantially parallel to the propulsion direction of the propulsion rod in the shaft, supports the deflection regulating member, and has a support position that can be adjusted in the bridging direction. To prevent buckling of the propulsion rod.