JP3598470B2

JP3598470B2 - Propulsion method and tip conductor of propulsion pipe

Info

Publication number: JP3598470B2
Application number: JP13521094A
Authority: JP
Inventors: 和雄戸次; 誠二西野
Original assignee: Taisei Corp
Current assignee: Taisei Corp
Priority date: 1994-05-25
Filing date: 1994-05-25
Publication date: 2004-12-08
Anticipated expiration: 2019-12-08
Also published as: JPH07317492A

Description

【０００１】
【産業上の利用分野】
本発明は推進工法及び推進管の先導体に関するものである。
【０００２】
【従来の技術】
推進工法は、図７に示すように、推進管ａの先端に先導体ｂを取り付け、発進坑内で反力受に反力をとって、ジャッキ推力等によって推進管ａを地中に圧入して管きょを布設する工法である。
複数の推進管ａを隣接させて布設する場合は、図７、８に示すように、推進管ａ及び先導体ｂの周面の軸方向に雌継手ｃ１と雄継手ｃ２を設け、先行して圧入された推進管ａの雌継手ｃ１に、圧入しようとする推進管ａの雄継手ｃ２を連結させて、既設推進管ａの雌継手ｃ１をガイドとして後行推進管ａの圧入が行われる。
【０００３】
【発明が解決しようとする課題】
上記の従来技術には、次のような問題点が存在する。
＜イ＞推進管の継手部は管体周面より突出しているため、推進時に大きな土圧を受け、変形あるいは破損するおそれがある。
【０００４】
＜ロ＞既設推進管に沿って後行推進管を圧入する際に、既設推進管の継手部と後行推進管の先導体の継手部との間に、玉石や礫が侵入して噛み込み、継手の変形あるいは破損の原因となる。
【０００５】
＜ハ＞継手部の遊びにより、施工精度が低下する。
【０００６】
【本発明の目的】
本発明は、上記のような問題点を解決するためになされたもので、継手部の変形あるいは破損を防止し、かつ施工精度の向上を図ることができる推進工法及び推進管の先導体を提供することを目的とする。
【０００７】
【課題を解決するための手段】
即ち、本発明は、推進管とその先端に装備した先導体との周面の軸方向に継手部を設け、既設推進管の継手部と圧入しようとする後行推進管及びその先導体の継手部を連結させて、既設推進管をガイドとして後行推進管の圧入を行う推進工法において、継手部内には弾力性を有する詰め物を詰め、既設推進管の継手部内の詰め物を、圧入しようとする後行推進管及びその先導体の継手部により圧縮しながら、継手部同士を連結させて推進管の圧入を行うと共に、先導体の前胴部周面に設けた先行カッタにより、地盤の継手部の圧入部分を先行して切削し、切削した土砂を、前記先行カッタの近傍に開設した土砂流入口より取り込みながら推進を行うことを特徴とした、推進工法及び推進管の先導体である。
【０００８】
【実施例】
以下、図面を参照しながら、本発明の一実施例について説明する。
＜イ＞先導体の構造
（１）全体の構造
先導体の全体構造は、図１に示すように、先導体の前胴部１と後胴部２、前胴部１の前面に装備される掘削用カッタ−ヘッド３、先導体内部の軸方向に配置される土砂搬出用オ−ガスクリュ−３１よりなる。
なお、泥水搬送用モ−タ及び配管類を配備した流体圧送方式にも本発明を適応させることができる。
【０００９】
（２）継手部
図１、２に示すように、先導体後胴部２の周面の軸方向に、等間隔をおいて２箇所に雌継手４を設ける。
図１、２は、最初に布設する基準推進管の先頭に装備する先導体であるため、両継手ともに雌継手４が装着されている。
雌継手４は、例えば図２に示すように、Ｌ字鋼を反転させて向かい合わせ、先導体の軸方向にスリットが形成されるよう装着する。
【００１０】
（３）保護板
雌継手４の先端部及びその近傍の側部には、鋼板よりなる先端保護板５と側部保護板５１を張り付ける。
これによって、推進中に雌継手４の先端部分より、玉石や礫が内部に侵入するのを防止することができる。
【００１１】
（４）発泡スチロ−ル
雌継手４の内部空間には、図２に示すように、弾力性を有する詰め物６を詰める。
この詰め物６には、例えば発泡スチロ−ルや発泡ウレタン等を使用できる。
詰め物６を雌継手４内に詰めることによって、推進中に玉石や礫が雌継手４内に侵入するのを防止することができる。
後述の雄継手との連結時には、この詰め物６を雄継手の推進により圧縮しながら、雌雄の継手が連結されることになる。
【００１２】
（５）先行カッタ
先行カッタ１１は、図１、３に示すように、先導体の前胴部１の周面に、後胴部２の継手部の延長上に設けられており（従って図１、３では２箇所）、地盤の継手部の圧入部分を先行して切削するためのものである。
この先行カッタ１１は、鋼板により後方の継手部と同じ断面形状に形成され、その先端面は内側に入り込むテ−パ−状に形成されている。
なお、先行カッタ１１の先端面にはハ−ドフェ−シング加工を施すとよい。
【００１３】
（６）土砂流入口
各先行カッタ１１の直前の前胴部１の周面には、土砂流入口１２が開設されている。
先行カッタ１１により切削された土砂は、この土砂流入口１２より内部に取り込まれ、オ−ガスクリュ−３１によって坑外に搬出される。
【００１４】
（７）切削ビット
先導体前胴部１の先端部に装備するカッタ−ヘッド３の周面には、切削ビット１３を付設する。
この切削ビット１３は、先行カッタ１１で切削した土砂によって、カッタ−ヘッド３の周面が摩耗するため、その摩耗を防止するために取付けるものである。
【００１５】
＜ロ＞基準推進管の圧入準備
図４に示すように、上記のように構成した先導体の後胴部２の尾端に、最初に埋設する基準推進管７ａを連結する。
基準推進管７ａの周面の軸方向には、先導体後胴部２に付設した雌継手４の延長上に、同形の雌継手４１を付設する。
これらの雌継手４１の先端部分にも、先端保護板５と側部保護板５１を張り付け、また内部には発泡スチロ−ル等の詰め物６を詰める。
【００１６】
＜ハ＞基準推進管の圧入
発進坑内に先導体を搬入し、その尾端に基準推進管７ａを継ぎ足しながら、発進坑内で反力受に反力をとって、ジャッキ推力等によって圧入していく。
このとき、先導体前胴部１に設けた先行カッタ１１により、地盤の継手部の圧入部分を先行して切削し、切削した土砂を土砂流入口１２より取り込みながら推進が行われるため、オ−ガスクリュ−３の地盤内への圧入が容易に行われる。
また、先端保護板５と側部保護板５１及び詰め物６によって、雌継手４内に玉石や礫が侵入するのを防止することができる。
【００１７】
＜ニ＞後行推進管の圧入準備
図５に示すように、基準推進管７ａと継手部を介して連結して付設される後行推進管７ｂ、７ｃ・・・は、雌継手４１と、その対向する側に雌継手４１内に嵌合する略Ｔ字状の雄継手８とを有している。
また、これらの後行推進管７ｂ等の先端に装備される先導体後胴部２にも、図６に示すように、前述の雌継手４と、その対向する位置に略Ｔ字状の雄継手８１を付設する。
この雄継手８１の先端部分には、雌継手４と同様に先端保護板９と側部保護板９１を張り付ける。
なお、雄継手８１の延長上の先導体前胴部１の周面には、先行カッタ１１及び土砂流入口１２等を設ける必要はない。
【００１８】
＜ホ＞後行推進管の圧入
図５に示すように、基準推進管７ａの布設完了後、その雌継手４１の尾端に、先導体後胴部２の雄継手８１及び後行推進管７ｂの雄継手８を連結し、雄継手８により雌継手４１内の詰め物６を圧縮しながら、基準推進管７ａをガイドとして圧入を行う。
このとき、雌継手４１と雄継手８間には詰め物６が介在するため、継手部の遊びが少なく、高精度な布設が可能となる。
後行推進管７ｂの布設が終了したら、後行推進管７ｃ以下、上記の手順を繰り返して所定数の推進管を布設し、管きょの施工を完了させる。
【００１９】
【本発明の効果】
本発明は以上説明したようになるため、次のような効果を得ることができる。
＜イ＞地盤の継手の圧入部分を、カッタにより先行して切削し、土砂流入口より切削土砂を取り込むため、継手部の圧入抵抗が減少し、継手部の変形や破損を防止することができる。
【００２０】
＜ロ＞継手部の先端部分には保護板を取り付け、雌継手内には詰め物を詰めるため、継手部内への玉石や礫あるいは裏込材の侵入を防止できる。
従って、玉石や礫の噛み込みによる、継手の変形あるいは破損を防止できる。
【００２１】
＜ハ＞雌継手内に詰めた詰め物により、継手部の遊びが制限されるため、推進管の打設精度が向上する。
【図面の簡単な説明】
【図１】先導体の説明図
【図２】図１のＩＩＩ−ＩＩＩ断面図
【図３】図１のＩＩ−ＩＩ断面図
【図４】推進方法の説明図
【図５】推進管の連結付設状態の説明図
【図６】後行先導体の説明図
【図７】従来技術の説明図
【図８】従来技術の説明図[0001]
[Industrial applications]
The present invention relates to a propulsion method and a conductor for a propulsion pipe.
[0002]
[Prior art]
In the propulsion method, as shown in FIG. 7, a leading conductor b is attached to the tip of a propulsion tube a, a reaction force is received in a reaction force receiver in a starting pit, and the propulsion tube a is pressed into the ground by jack thrust or the like. This is a method of laying pipes.
When laying a plurality of propulsion tubes a adjacent to each other, as shown in FIGS. 7 and 8, a female joint c1 and a male joint c2 are provided in the axial direction of the peripheral surfaces of the propulsion tubes a and the leading conductor b, and The male joint c2 of the propulsion pipe a to be press-fitted is connected to the female joint c1 of the press-fitted propulsion pipe a, and the subsequent propulsion pipe a is press-fitted using the female joint c1 of the existing propulsion pipe a as a guide.
[0003]
[Problems to be solved by the invention]
The above prior art has the following problems.
<A> Since the joint portion of the propulsion pipe protrudes from the peripheral surface of the pipe body, it receives a large earth pressure during propulsion and may be deformed or damaged.
[0004]
<B> Cobbles and gravel enter and bite between the joint of the existing propulsion pipe and the joint of the leading conductor of the following propulsion pipe when press-fitting the following propulsion pipe along the existing propulsion pipe. This may cause deformation or breakage of the joint.
[0005]
<C> Construction accuracy is reduced due to play of the joint portion.
[0006]
[Object of the present invention]
The present invention has been made in order to solve the above problems, and provides a propulsion method and a propulsion pipe tip conductor capable of preventing deformation or breakage of a joint portion and improving construction accuracy. The purpose is to do.
[0007]
[Means for Solving the Problems]
That is, the present invention provides a joint portion in the axial direction of the peripheral surface of the propulsion tube and the leading conductor provided at the tip thereof, and a joint between the propulsion tube and the leading conductor which is to be press-fitted with the joint portion of the existing propulsion tube. In the propulsion method of connecting the parts and press-fitting the following propulsion pipe using the existing propulsion pipe as a guide, the joint part is filled with elastic filling, and the filling in the joint part of the existing propulsion pipe is to be press-fitted. While compressing the joints of the trailing propulsion pipe and its leading conductor, the joints are connected to each other to press-fit the propulsion pipe, and the leading cutter provided on the peripheral surface of the front trunk of the leading conductor is used to join the ground. A cutting method and a leading conductor of a propulsion pipe, characterized in that the press-fitting portion is cut in advance, and the cut is carried out while taking in the cut earth and sand from an earth and sand inlet opened near the preceding cutter.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
<A> Structure of Lead Conductor (1) Overall Structure The whole structure of the lead conductor is mounted on the front body 1, the rear body 2 and the front surface of the front body 1 of the lead conductor as shown in FIG. It comprises an excavating cutter head 3 and an ore screw 31 for carrying out earth and sand disposed in an axial direction inside the leading conductor.
The present invention can also be applied to a fluid pressure feeding system provided with a mud transport motor and piping.
[0009]
(2) Joint part As shown in FIGS. 1 and 2, two female joints 4 are provided at equal intervals in the axial direction of the peripheral surface of the rear body 2 of the leading conductor.
FIGS. 1 and 2 show a leading conductor provided at the head of a reference propulsion pipe to be laid first, so that a female joint 4 is attached to both joints.
For example, as shown in FIG. 2, the female joint 4 is attached so that the L-shaped steel is turned upside down and faced to form a slit in the axial direction of the leading conductor.
[0010]
(3) The distal end protection plate 5 and the side protection plate 51 made of a steel plate are attached to the distal end portion of the protective plate female joint 4 and the side portion near the distal end portion.
Thus, it is possible to prevent cobblestones and gravel from entering the inside from the tip portion of the female joint 4 during propulsion.
[0011]
(4) As shown in FIG. 2, a filling 6 having elasticity is packed in the internal space of the styrofoam female joint 4.
As the filling 6, for example, foamed styrene or urethane foam can be used.
By packing the padding 6 into the female joint 4, it is possible to prevent cobblestones and gravel from entering the female joint 4 during propulsion.
At the time of connection with a male joint described later, the male and female joints are connected while compressing the padding 6 by the promotion of the male joint.
[0012]
(5) Leading cutter As shown in FIGS. 1 and 3, the leading cutter 11 is provided on the peripheral surface of the front body 1 of the leading conductor on an extension of the joint part of the rear body 2 (according to FIG. 1). 3, two places) to cut the press-fitted part of the joint part of the ground in advance.
The leading cutter 11 is formed of a steel plate to have the same cross-sectional shape as that of the rear joint portion, and the leading end surface thereof is formed in a tapered shape that enters inside.
The front end surface of the leading cutter 11 may be subjected to a hard facing process.
[0013]
(6) Sediment flow inlet A sediment flow inlet 12 is formed on the peripheral surface of the front trunk portion 1 immediately before each preceding cutter 11.
The earth and sand cut by the preceding cutter 11 is taken into the inside through the earth and sand inlet 12 and is carried out of the mine by the O-gas screw 31.
[0014]
(7) Cutting Bit A cutting bit 13 is provided on the peripheral surface of the cutter head 3 provided at the tip of the front body 1 of the conductor.
The cutting bit 13 is attached in order to prevent the peripheral surface of the cutter head 3 from being worn by earth and sand cut by the preceding cutter 11 and to prevent the wear.
[0015]
<B> Preparation for press-fitting the reference propulsion pipe As shown in FIG. 4, the reference propulsion pipe 7a to be first buried is connected to the tail end of the rear body 2 of the front conductor configured as described above.
In the axial direction of the peripheral surface of the reference propulsion pipe 7a, a female joint 41 of the same shape is provided on an extension of the female joint 4 provided on the rear body 2 of the leading conductor.
A tip protection plate 5 and a side protection plate 51 are attached to the tip portions of the female joints 41, and a padding 6 such as styrofoam is packed inside.
[0016]
<C> The leading conductor is carried into the starting pit of the reference propulsion pipe, and while adding the reference propulsion pipe 7a to the tail end, the reaction force is received in the starting pit to receive the reaction force, and the jack is pressed in by the jack thrust or the like. .
At this time, the leading cutter 11 provided on the front conductor front body 1 cuts the press-fitted portion of the joint of the ground in advance, and the propulsion is performed while taking the cut earth and sand through the earth and sand inlet 12. The press-fit of the gas screw-3 into the ground is easily performed.
In addition, the tip protection plate 5, the side protection plate 51, and the padding 6 can prevent cobblestones and gravel from entering the female joint 4.
[0017]
<D> Preparation for press-fitting of trailing propulsion pipe As shown in FIG. 5, the trailing propulsion pipes 7b, 7c,... On the opposite side, a substantially T-shaped male joint 8 fitted into the female joint 41 is provided.
Also, as shown in FIG. 6, the female joint 4 and the substantially T-shaped male joint at the position opposite to the female joint 4 are also provided at the leading end of the leading conductor 2 provided at the distal end of the trailing propulsion pipe 7b or the like. A joint 81 is provided.
The distal end protection plate 9 and the side protection plate 91 are attached to the distal end portion of the male joint 81 in the same manner as the female joint 4.
It is not necessary to provide the leading cutter 11 and the earth and sand inflow port 12 on the peripheral surface of the front conductor front body portion 1 on the extension of the male joint 81.
[0018]
<E> Press-fitting of the trailing propulsion pipe As shown in FIG. 5, after the installation of the reference propulsion pipe 7a is completed, the male joint 81 of the leading conductor rear trunk 2 and the trailing propulsion pipe 7b are attached to the tail end of the female joint 41. The male joint 8 is connected and the padding 6 in the female joint 41 is compressed by the male joint 8, and press-fitting is performed using the reference propulsion pipe 7a as a guide.
At this time, since the padding 6 is interposed between the female joint 41 and the male joint 8, the play of the joint portion is small, and the high-precision laying is possible.
When the laying of the trailing propulsion pipe 7b is completed, the above procedure is repeated from the trailing propulsion pipe 7c onward to lay a predetermined number of propulsion pipes to complete the construction of the pipe.
[0019]
[Effects of the present invention]
Since the present invention has been described above, the following effects can be obtained.
<B> Since the press-fitted part of the ground joint is cut in advance by a cutter and the cut sand is taken in from the sediment inflow port, the press-fit resistance of the joint is reduced, and deformation and breakage of the joint can be prevented. .
[0020]
<B> A protection plate is attached to the tip of the joint, and padding is packed in the female joint, so that cobblestone, gravel, or backing material can be prevented from entering the joint.
Therefore, it is possible to prevent the joint from being deformed or damaged due to biting of cobblestones or gravel.
[0021]
<C> Since the play of the joint portion is limited by the filling in the female joint, the driving accuracy of the propulsion pipe is improved.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a leading conductor. FIG. 2 is a sectional view taken along line III-III of FIG. 1. FIG. 3 is a sectional view taken along line II-II of FIG. 1. FIG. 4 is an explanatory view of a propulsion method. FIG. 6 is an explanatory view of an attached state. FIG. 6 is an explanatory view of a subsequent conductor. FIG. 7 is an explanatory view of a prior art.

Claims

A joint is provided in the axial direction of the peripheral surface of the propulsion pipe and the leading conductor provided at the tip thereof, and the joint of the existing propulsion pipe and the trailing propulsion pipe to be press-fitted and the joint of the leading conductor are engaged. , In the propulsion method to press-fit the following propulsion pipe using the existing propulsion pipe as a guide,
Provided on the peripheral surface of the front trunk portion of the leading conductor, the leading end surface is cut in advance by press-fitting the joint portion of the ground by a tapered leading cutter that has entered inside toward the rear .
Cutting the soil, Nde Captures inside from sediment inlet opened in the vicinity of the leading cutter was characterized by performing the propulsion while out by auger screw immediately after capture,
Propulsion method.

The joint portion is provided propulsion tube and the axial direction of the peripheral surface of the leading body equipped at its distal end, by engaging the fitting portions of the row propulsion tube and its leading body after to be press-fit the joint portion of the existing propulsion tube , In the propulsion method to press-fit the following propulsion pipe using the existing propulsion pipe as a guide,
Fill the joint with elastic fillings,
While compressing the filling in the joint part of the existing propulsion pipe by the joint part of the trailing propulsion pipe to be press-fitted and its leading conductor, while connecting the joint parts and press-fitting the propulsion pipe,
By the leading cutter provided on the front body peripheral surface of the leading conductor, the press-fitting part of the joint part of the ground is cut in advance,
Characterized in that propulsion is performed while taking in the cut earth and sand from the sediment inflow opening established in the vicinity of the preceding cutter.
Propulsion method.

In the propulsion method according to claim 2,
Using styrofoam for the filling,
Propulsion method.

In the propulsion method according to claim 2,
Characterized by using urethane foam for the filling,
Propulsion method.

In the propulsion method according to any one of claims 1 to 4,
At the tip of the joint portion, a protection plate for preventing intrusion of boulders and gravel in the groove cut by the preceding cutter is attached,
Propulsion method.

In the propulsion method according to any one of claims 1 to 5,
A cutting bit of compacted earth and sand compacted toward the side wall of the leading conductor by the leading cutter is provided on the peripheral surface of the excavation rotating part provided at the tip of the leading conductor,
Propulsion method.

A joint is provided in the axial direction of the peripheral surface of the propulsion pipe and the leading conductor provided at the tip thereof, and the joint of the existing propulsion pipe and the trailing propulsion pipe to be press-fitted and the joint of the leading conductor are engaged. , Using the existing propulsion pipe as a guide for the propulsion method for press-fitting the following propulsion pipe,
Provided before the barrel portion peripheral surface of the leading body, cutting prior to press-fitting portions of the joint portion of the ground, and tapered leading cutter tip surface has entered the inside toward the rear direction,
Opened in the vicinity of the leading cutter, and possess the sediment inlet incorporate cutting earth and sand,
The earth and sand taken in from the earth and sand inflow port was characterized by being carried out by an auger screw immediately after being taken in,
Propulsion tube tip conductor.

The propulsion tube tip conductor according to claim 7,
A cutting bit of compacted earth and sand compacted toward the side wall of the leading conductor by the leading cutter is provided on the peripheral surface of the excavation rotating part provided at the tip of the leading conductor,
Propulsion tube tip conductor.

In the tip conductor of the propulsion pipe according to claim 7 or 8,
At the tip of the joint portion, a protection plate for preventing intrusion of boulders and gravel in the groove cut by the preceding cutter is attached,
Propulsion tube tip conductor.

The tip conductor of the propulsion pipe according to any one of claims 7 to 9,
Characterized in that the interior space of the joint portion is filled with elastic filling.
Propulsion tube tip conductor.

The tip conductor of the propulsion pipe according to claim 10,
Using styrofoam for the filling,
Propulsion tube tip conductor.

The tip conductor of the propulsion pipe according to claim 10,
Characterized by using urethane foam for the filling,
Propulsion tube tip conductor.