JP2021156097A - Forming method of starting port and starting port structure - Google Patents

Forming method of starting port and starting port structure Download PDF

Info

Publication number
JP2021156097A
JP2021156097A JP2020059555A JP2020059555A JP2021156097A JP 2021156097 A JP2021156097 A JP 2021156097A JP 2020059555 A JP2020059555 A JP 2020059555A JP 2020059555 A JP2020059555 A JP 2020059555A JP 2021156097 A JP2021156097 A JP 2021156097A
Authority
JP
Japan
Prior art keywords
pipe
starting port
guide pipe
forming
propulsion
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.)
Granted
Application number
JP2020059555A
Other languages
Japanese (ja)
Other versions
JP7389698B2 (en
Inventor
浩昭 村中
Hiroaki Muranaka
浩昭 村中
武 土居
Takeshi Doi
武 土居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Okumura Corp
Original Assignee
Okumura Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Okumura Corp filed Critical Okumura Corp
Priority to JP2020059555A priority Critical patent/JP7389698B2/en
Publication of JP2021156097A publication Critical patent/JP2021156097A/en
Application granted granted Critical
Publication of JP7389698B2 publication Critical patent/JP7389698B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

To provide a forming method of a starting port capable of connecting a pit and a main pipe using a predetermined length of propulsion pipe regardless of a disposition of an above-ground building and an underground structure.SOLUTION: A forming method of a starting port 10b for starting a propulsion pipe 15 from a side wall of a vertical steel pit 10a with a small diameter toward a main pipe 17 diagonally below includes the steps of forming a pit port for inserting a guide pipe 11 having a larger diameter than the propulsion pipe, press-fitting the guide pipe from the pit port, filling a first filling material 12 for water cut-off in a gap of the press-fit guide pipe and the pit port, drilling the inside of the guide pipe, and attaching a water cut-off packing 14 having an insertion hole 14c for inserting the propulsion pip at a tip of the guide pipe.SELECTED DRAWING: Figure 2

Description

本発明は、発進口の形成方法および発進口構造に関し、特に、立坑の側壁から本管に向けて推進管を発進させるための発進口の形成方法および発進口構造に関する。 The present invention relates to a method of forming a starting port and a starting port structure, and more particularly to a method of forming a starting port and a starting port structure for starting a propulsion pipe from a side wall of a shaft toward a main pipe.

上記技術分野において、特許文献１には、立坑の側壁から本管へ向けて水平に推進管を発進させる工法であって、推進管差込用空間を形成するための筒状体を地中に設置して、設置した筒状体の内部に推進管を差し込んで、推進させる工法が開示されている。 In the above technical field, Patent Document 1 describes a method of starting a propulsion pipe horizontally from a side wall of a shaft toward a main pipe, and a tubular body for forming a space for inserting the propulsion pipe is placed in the ground. A method of installing and inserting a propulsion pipe into the installed tubular body to propel it is disclosed.

特開昭６０−１７３２９５号公報Japanese Unexamined Patent Publication No. 60-173295

しかしながら、上記特許文献１に記載の工法は、推進管を立坑の底面に水平に配置して、推進させる工法であり、所定以上の長さの推進管を推進させる場合には、立坑の口径に応じた長さの複数の推進管を順次筒状体を送り込まなければならなかった。そのため、特許文献１に記載の工法では、立坑と本管との間の距離に応じた長さの推進管を用いるためには、用いられる推進管の長さに応じた口径の立坑を形成しなければならなかった。よって、地上建物や地下構造物の配置条件によっては、所望長さの推進管を用いて、立坑と本管とを接続することができなかった。 However, the construction method described in Patent Document 1 is a construction method in which a propulsion pipe is horizontally arranged on the bottom surface of a shaft and propelled, and when a propulsion pipe having a length longer than a predetermined length is propelled, the diameter of the shaft is adjusted. Multiple propulsion tubes of corresponding length had to be fed in sequence in a tubular body. Therefore, in the construction method described in Patent Document 1, in order to use a propulsion pipe having a length corresponding to the distance between the shaft and the main pipe, a shaft having a diameter corresponding to the length of the propulsion pipe used is formed. I had to. Therefore, depending on the arrangement conditions of the above-ground building and the underground structure, it was not possible to connect the shaft and the main pipe using a propulsion pipe having a desired length.

上記目的を達成するため、本発明に係る発進口の形成方法は、
小口径の垂直鋼製立坑の側壁から、斜め下方の本管に向けて推進管を発進させるための発進口の形成方法であって、
前記側壁に、前記推進管よりも口径の大きなガイド管を挿入するための坑口を形成する工程と、
前記ガイド管を、前記坑口から圧入させる工程と、
圧入された前記ガイド管と前記坑口との隙間に、止水用の第１間詰め材を充填する工程と、
前記ガイド管の内部を掘削する工程と、
前記ガイド管の先端に、前記推進管を挿通させるための挿通孔を有する止水パッキンを取り付ける工程と、
を含む。 In order to achieve the above object, the method of forming a starting port according to the present invention is:
It is a method of forming a starting port for starting a propulsion pipe from a side wall of a small-diameter vertical steel shaft toward a main pipe diagonally downward.
A step of forming a wellhead for inserting a guide pipe having a diameter larger than that of the propulsion pipe on the side wall, and
The step of press-fitting the guide pipe from the wellhead and
A step of filling the gap between the press-fitted guide pipe and the wellhead with a first padding material for stopping water, and
The process of excavating the inside of the guide pipe and
A step of attaching a waterproof packing having an insertion hole for inserting the propulsion pipe to the tip of the guide pipe, and
including.

上記目的を達成するため、本発明に係る発進口構造は、
小口径の垂直鋼製立坑の側壁から、斜め下方の本管に向けて推進管を発進させるための発進口構造であって、
前記側壁に、前記推進管よりも口径の大きなガイド管を挿入するための坑口を形成する工程と、
前記ガイド管を、前記坑口から圧入させる工程と、
圧入された前記ガイド管と前記坑口との隙間に、止水用の第１間詰め材を充填する工程と、
前記ガイド管の内部を掘削する工程と、
前記ガイド管の先端に、前記推進管を挿通させるための挿通孔を有する止水パッキンを設置する工程と、
を含む発進口の形成方法によって形成される。 In order to achieve the above object, the starting port structure according to the present invention is
It is a starting port structure for starting the propulsion pipe from the side wall of a small-diameter vertical steel shaft toward the main pipe diagonally downward.
A step of forming a wellhead for inserting a guide pipe having a diameter larger than that of the propulsion pipe on the side wall, and
The step of press-fitting the guide pipe from the wellhead and
A step of filling the gap between the press-fitted guide pipe and the wellhead with a first padding material for stopping water, and
The process of excavating the inside of the guide pipe and
A step of installing a waterproof packing having an insertion hole for inserting the propulsion pipe at the tip of the guide pipe, and
It is formed by a method of forming a starting port including.

本発明の発進口の形成方法によれば、地上建物や地下構造物の配置条件によらず、所望の長さの推進管を用いて、立坑と本管とを接続することができる。 According to the method of forming a starting port of the present invention, the shaft and the main can be connected by using a propulsion pipe having a desired length regardless of the arrangement conditions of the above-ground building and the underground structure.

本発明の好ましい一実施形態に係る発進口の形成方法の概要を説明するための（ａ）上面模式図、（ｂ）Ａ−Ａ’線断面模式図である。It is (a) top surface schematic diagram and (b) AA'line sectional sectional schematic diagram for demonstrating the outline of the starting port forming method which concerns on one preferred embodiment of this invention. 本発明の好ましい一実施形態に係る発進口の形成方法の手順を説明するための図である。It is a figure for demonstrating the procedure of the method of forming a starting port which concerns on one preferred embodiment of this invention. 本発明の好ましい一実施形態に係る発進口の形成方法に用いられる止水用パッキンの構成を説明するための図である。It is a figure for demonstrating the structure of the waterproof packing used in the method of forming a start port which concerns on one preferred embodiment of this invention. 本発明の好ましい一実施形態に係る発進口の形成方法により形成される発進口を説明するための斜視図である。It is a perspective view for demonstrating the start port formed by the method of forming a start port which concerns on one preferred embodiment of this invention.

以下、図１〜図５を参照して、本実施形態に係る発進口の形成方法について説明する。図１を参照すると、本実施形態に係る発進口の形成方法は、地盤１０に掘削された小口径の垂直鋼製立坑１０ａの側壁１０ｃから、斜め下方に設けられた本管１７に向けて推進管１５を発進させるための発進口１０ｂの形成方法である。 Hereinafter, a method of forming a starting port according to the present embodiment will be described with reference to FIGS. 1 to 5. With reference to FIG. 1, the method of forming the starting port according to the present embodiment is propelled from the side wall 10c of the small-diameter vertical steel shaft 10a excavated in the ground 10 toward the main pipe 17 provided diagonally downward. This is a method of forming a starting port 10b for starting the tube 15.

発進口１０ｂから発進された推進管１５は、地盤１０の中を進み、本管１７に到達し、本管１７と垂直鋼製立坑１０ａとを連結させる。本管１７および発進口１０ｂは、地下水１９よりも低い位置にあるため、垂直鋼製立坑１０ａと本管１７との中間地点付近を、推進管１５が推進している間に地下水１９が逆流する可能性がある。そのため、発進口１０ｂの周囲の地盤１０および本管１７の周囲の地盤１０には、地盤改良剤１８が注入されている。なお、垂直鋼製立坑１０ａと本管１７との中間地点付近は、地盤改良剤１８が届かないため、改良地盤が途中で途切れている。 The propulsion pipe 15 started from the starting port 10b travels through the ground 10 and reaches the main pipe 17, connecting the main pipe 17 and the vertical steel shaft 10a. Since the main pipe 17 and the starting port 10b are located lower than the groundwater 19, the groundwater 19 flows backward while the propulsion pipe 15 is propelling the vicinity of the intermediate point between the vertical steel shaft 10a and the main pipe 17. there is a possibility. Therefore, the ground improving agent 18 is injected into the ground 10 around the starting port 10b and the ground 10 around the main pipe 17. Since the ground improving agent 18 does not reach the vicinity of the intermediate point between the vertical steel shaft 10a and the main pipe 17, the improved ground is interrupted in the middle.

次に、図２（ａ）〜（ｈ）を参照して、本実施形態に係る発進口の形成方法の手順を説明する。 Next, the procedure of the starting port forming method according to the present embodiment will be described with reference to FIGS. 2 (a) to 2 (h).

＜図２（ａ）＞
まず、垂直鋼製立坑１０ａの周囲の地盤１０および本管１７の推進管１５の到達部周囲の地盤１０に地盤改良剤１８を注入し、垂直鋼製立坑１０ａの側壁１０ｃを楕円形に溶断して坑口としての発進口１０ｂを形成する。なお、発進口１０ｂの長径および短径の大きさは、ガイド管１１が挿入可能な大きさとなっている。ガイド管１１の口径は、推進管１５の口径よりも大きい。ここで、ガイド管１１の口径は、φ９００であり、推進管１５の口径は、φ７００であるが、ガイド管１１および推進管１５の口径は、これらには限定されない。 <Fig. 2 (a)>
First, the ground improving agent 18 is injected into the ground 10 around the vertical steel shaft 10a and the ground 10 around the reaching portion of the propulsion pipe 15 of the main pipe 17, and the side wall 10c of the vertical steel shaft 10a is blown into an elliptical shape. The starting port 10b as a wellhead is formed. The major axis and the minor axis of the starting port 10b are large enough to allow the guide tube 11 to be inserted. The diameter of the guide pipe 11 is larger than the diameter of the propulsion pipe 15. Here, the diameter of the guide pipe 11 is φ900, and the diameter of the propulsion pipe 15 is φ700, but the diameters of the guide pipe 11 and the propulsion pipe 15 are not limited thereto.

側壁１０ｃを楕円形に溶断するのは、後に、円筒形状のガイド管１１を斜め下に向けて推進させるためのである。すなわち、所定長さを有するガイド管１１および推進管１５は、小口径の垂直鋼製立坑１０ａには、水平状態で入れることができない。したがって、ガイド管１１および推進管１５を、小口径の垂直鋼製立坑１０ａの中に入れるためには、斜めにした状態でしか入れられない。円筒形状のガイド管１１を斜めにした状態で、垂直鋼製立坑１０ａの側壁１０ｃから地盤１０に挿入すると、側壁１０ｃには、楕円形状の穴が開くことになる。よって、垂直鋼製立坑１０ａの側壁１０ｃに、ガイド管１１を通すための穴として、楕円形状の発進口１０ｂを予め設けている。 The reason why the side wall 10c is blown into an elliptical shape is to later propel the cylindrical guide tube 11 diagonally downward. That is, the guide pipe 11 and the propulsion pipe 15 having a predetermined length cannot be inserted into the small-diameter vertical steel shaft 10a in a horizontal state. Therefore, in order to insert the guide pipe 11 and the propulsion pipe 15 into the small-diameter vertical steel shaft 10a, the guide pipe 11 and the propulsion pipe 15 can be inserted only in an oblique state. When the cylindrical guide pipe 11 is slanted and inserted into the ground 10 from the side wall 10c of the vertical steel shaft 10a, an elliptical hole is formed in the side wall 10c. Therefore, an elliptical start port 10b is provided in advance in the side wall 10c of the vertical steel shaft 10a as a hole for passing the guide pipe 11.

なお、側壁１０ｃを楕円形状にくり抜いて発進口１０ｂを設けると、発進口１０ｂは、地下水１９よりも低い位置にあるため、そのままの状態では、地下水１９が、垂直鋼製立坑１９０ａに逆流する可能性がある。よって、発進口１０ｂを設ける前に、地盤改良剤１８を地盤１０に注入して発進口１０ｂの周囲の地盤１０を改良しておく方が好ましい。同様に、本管１７も地下水１９よりも低い位置にあるため、本管１７の推進管１５の到達部周辺の地盤１０も、予め地盤改良しておかないと、推進管１５が本管１７まで貫通した際に、地下水１９が、本管１７の中に逆流する可能性がある。 If the side wall 10c is hollowed out in an elliptical shape to provide the starting port 10b, the starting port 10b is located at a position lower than the groundwater 19, so that the groundwater 19 can flow back into the vertical steel shaft 190a as it is. There is sex. Therefore, it is preferable to inject the ground improving agent 18 into the ground 10 to improve the ground 10 around the starting port 10b before providing the starting port 10b. Similarly, since the main pipe 17 is also located at a position lower than the groundwater 19, the ground 10 around the reaching portion of the propulsion pipe 15 of the main pipe 17 must be ground-improved in advance, or the propulsion pipe 15 will reach the main pipe 17. When penetrating, groundwater 19 may flow back into the main 17.

＜図２（ｂ）＞
次に、ガイド管１１を、形成された発進口１０ｂから圧入させる。ガイド管１１は、斜め下に向けた状態で、発進口１０ｂに挿入され、所定長さ圧入されたところで、ガイド管１１の圧入が停止される。ガイド管１１の圧入長さは、例えば、地盤改良剤１８により地盤１０が改良されている範囲内にガイド管１１の先端部が留まる程度の長さであるが、これには限定されない。 <Fig. 2 (b)>
Next, the guide pipe 11 is press-fitted from the formed starting port 10b. The guide pipe 11 is inserted into the starting port 10b in a state of being directed diagonally downward, and when the guide pipe 11 is press-fitted for a predetermined length, the press-fitting of the guide pipe 11 is stopped. The press-fitting length of the guide pipe 11 is, for example, a length such that the tip end portion of the guide pipe 11 stays within the range in which the ground 10 is improved by the ground improving agent 18, but is not limited thereto.

＜図２（ｃ）＞
ガイド管１１を発進口１０ｂから圧入させたら、圧入されたガイド管１１と発進口１０ｂとの間に、止水用の間詰め材１２を充填する。間詰め材１２は、セメントおよびモルタルの少なくともいずれかを含むが、ガイド管１１と発進口１０ｂとの隙間からの地下水１９の流入を阻止できる材料であれば、いずれの材料であってもよい。なお、間詰め材１２は、部材と部材との間に充填される材料であり、ここでは、ガイド管１１と発進口１０ｂとの間に塗り込められる材料である。 <Fig. 2 (c)>
After the guide pipe 11 is press-fitted from the start port 10b, the filling material 12 for stopping water is filled between the press-fitted guide pipe 11 and the start port 10b. The filling material 12 contains at least one of cement and mortar, but may be any material as long as it can prevent the inflow of groundwater 19 from the gap between the guide pipe 11 and the starting port 10b. The filling material 12 is a material that is filled between the members, and here, it is a material that can be applied between the guide pipe 11 and the starting port 10b.

＜図２（ｄ）＞
間詰め材１２の充填が終了したら、ガイド管１１の内部を掘削する。ガイド管１１の内部の掘削は、掘削機１３により行われ、圧入したままのガイド管１１の内部にある地盤１０を掘削機１３により掻き出す。掘削機１３は、例えば、スクリューオーガーであり、スクリューオーガーを電動または油圧モータなどの駆動により回転させて、スクリューオーガーの先端部で掘削した土砂を排出しながら地盤１０の掘削を進める機械である。なお、掘削機１３は、地盤１０を掘削できる機械であれば、スクリューオーガーには限定されず、例えば、手作業で掘削することもできる。 <Fig. 2 (d)>
When the filling of the filling material 12 is completed, the inside of the guide pipe 11 is excavated. The excavation inside the guide pipe 11 is performed by the excavator 13, and the ground 10 inside the guide pipe 11 as it is press-fitted is scraped out by the excavator 13. The excavator 13 is, for example, a screw auger, which is a machine that rotates a screw auger by driving an electric or hydraulic motor to discharge the earth and sand excavated at the tip of the screw auger while excavating the ground 10. The excavator 13 is not limited to the screw auger as long as it can excavate the ground 10, and can be excavated manually, for example.

＜図２（ｅ）＞
ガイド管１１の内部の掘削が終わったら、ガイド管１１を垂直鋼製立坑１０ａの側壁面に沿って切断する。具体的には、垂直鋼製立坑１０ａの側壁面に沿って、地盤１０に圧入されたガイド管１１のうち、垂直鋼製立坑１０ａの内部に突出している突出部１１ａを切断する。ここで、突出部１１ａは、ガイド管１１のうち、地盤１０に圧入され、埋設されていない部分であり、垂直鋼製立坑１０ａの内部で露出している部分である。このように、ガイド管１１の突出部１１ａを側壁面に沿って切断することにより、推進管１５をガイド管１１の内部に挿通させる際に、スムーズに推進管１５を案内することができる。 <Fig. 2 (e)>
After excavating the inside of the guide pipe 11, the guide pipe 11 is cut along the side wall surface of the vertical steel shaft 10a. Specifically, among the guide pipes 11 press-fitted into the ground 10 along the side wall surface of the vertical steel shaft 10a, the protruding portion 11a protruding inside the vertical steel shaft 10a is cut. Here, the protruding portion 11a is a portion of the guide pipe 11 that is press-fitted into the ground 10 and is not buried, and is a portion that is exposed inside the vertical steel shaft 10a. By cutting the protruding portion 11a of the guide pipe 11 along the side wall surface in this way, the propulsion pipe 15 can be smoothly guided when the propulsion pipe 15 is inserted into the inside of the guide pipe 11.

＜図２（ｆ）＞
ガイド管１１の先端に、推進管１５を挿通させるための挿通孔１４ｃを有する止水用パッキン１４を取り付ける。推進管１５は、ガイド管１１よりも口径が小さいため、推進管１５を推進させると、ガイド管１１と推進管１５との隙間から、地下水１９が逆流する可能性がある。特に、発進口１０ｂと本管１７との中間点付近においては、地盤改良剤１８による地盤改良が不十分な区域があるためである。そのため、ガイド管１１の先端部分に止水用パッキン１４を取り付けることにより、地下水１９の流入を防止している。ここで、止水用パッキン１４は、ゴム製のパッキンであるため、推進管１５を挿通孔１４ｃに挿通させた際に、推進管１５と止水用パッキン１４とが隙間なく密着するため、地下水１９の逆流を効果的に防止できる。 <Fig. 2 (f)>
A water blocking packing 14 having an insertion hole 14c for inserting the propulsion pipe 15 is attached to the tip of the guide pipe 11. Since the propulsion pipe 15 has a smaller diameter than the guide pipe 11, when the propulsion pipe 15 is propelled, the groundwater 19 may flow back from the gap between the guide pipe 11 and the propulsion pipe 15. In particular, in the vicinity of the midpoint between the starting port 10b and the main pipe 17, there is an area where the ground improvement by the ground improving agent 18 is insufficient. Therefore, the inflow of groundwater 19 is prevented by attaching the water blocking packing 14 to the tip of the guide pipe 11. Here, since the water-stopping packing 14 is a rubber packing, when the propulsion pipe 15 is inserted into the insertion hole 14c, the propulsion pipe 15 and the water-stopping packing 14 are in close contact with each other without a gap, so that the groundwater The backflow of 19 can be effectively prevented.

＜図２（ｇ）＞
推進管１５を、挿通孔１４ｃから圧入する。推進管１５の外径と挿通孔１４ｃの径とはほぼ同じ大きさであり、推進管１５を挿通孔１４ｃに挿通すると、推進管１５と止水用パッキン１４とが密着した状態で、推進管１５が、地盤１０に圧入される。推進管１５は、推進機２３により地盤１０に圧入され、地盤１０を掘削しながら推進する。 <Fig. 2 (g)>
The propulsion pipe 15 is press-fitted through the insertion hole 14c. The outer diameter of the propulsion pipe 15 and the diameter of the insertion hole 14c are almost the same size, and when the propulsion pipe 15 is inserted into the insertion hole 14c, the propulsion pipe 15 and the water blocking packing 14 are in close contact with each other. 15 is press-fitted into the ground 10. The propulsion pipe 15 is press-fitted into the ground 10 by the propulsion machine 23, and propels while excavating the ground 10.

＜図２（ｈ）＞
推進管１５を本管１７に到達するように、圧入する際に、ガイド管１１と推進管１５との隙間に間詰め材１６を充填しておくことが望ましい。つまり、推進管１５は、止水用パッキン１４の挿通孔１４ｃを挿通されるので、地下水１９の逆流が起こる可能性は低いが、間詰め材１６を充填させておくことで、止水用パッキン１４を間詰め材１６により支持できるので、防水効果がより顕著となる。そして、推進管１５が、本管１７に到達したら、推進管１５の圧入を停止する。なお、間詰め材１６は、図２（ｇ）のタイミングで充填してもよい。なお、間詰め材１６は、セメントおよびモルタルの少なくともいずれかを含むが、ガイド管１１と推進管１５との隙間からの地下水の流入を阻止できる材料であれば、いずれの材料であってもよい。 <Fig. 2 (h)>
When press-fitting the propulsion pipe 15 so as to reach the main pipe 17, it is desirable to fill the gap between the guide pipe 11 and the propulsion pipe 15 with the filling material 16. That is, since the propulsion pipe 15 is inserted through the insertion hole 14c of the waterproof packing 14, there is a low possibility that the backflow of the groundwater 19 will occur. Since 14 can be supported by the filling material 16, the waterproof effect becomes more remarkable. Then, when the propulsion pipe 15 reaches the main pipe 17, the press-fitting of the propulsion pipe 15 is stopped. The filling material 16 may be filled at the timing shown in FIG. 2 (g). The filling material 16 contains at least one of cement and mortar, but may be any material as long as it can prevent the inflow of groundwater from the gap between the guide pipe 11 and the propulsion pipe 15. ..

次に、図３および図４を参照して、発進口１０ｂおよび止水用パッキン１４の構造について説明する。止水用パッキン１４は、ゴムリング１４ａと金属リング１４ｂとを含んで構成されている。止水用パッキン１４は、断面で見ると、円形平板状のゴムリング１４ａの周縁部を、断面形状がコの字形状の金属リング１４ｂが、上下から挟持する形状となっている。このようにして、ゴムリング１４ａの外周部に金属リング１４ｂが取り付けられる。 Next, the structures of the starting port 10b and the water blocking packing 14 will be described with reference to FIGS. 3 and 4. The waterproof packing 14 includes a rubber ring 14a and a metal ring 14b. When viewed in cross section, the waterproof packing 14 has a shape in which a metal ring 14b having a U-shaped cross section sandwiches a peripheral portion of a circular flat plate-shaped rubber ring 14a from above and below. In this way, the metal ring 14b is attached to the outer peripheral portion of the rubber ring 14a.

金属リング１４ｂは、２枚の円環板状の金属が所定の距離をおいて向かい合わせられるように配置されている。ゴムリング１４ａは、金属リング１４ｂに嵌め込まれているが、例えば、接着剤等を追加して補強してもよい。 The metal ring 14b is arranged so that two annular plate-shaped metals face each other at a predetermined distance. The rubber ring 14a is fitted in the metal ring 14b, but for example, an adhesive or the like may be added to reinforce the rubber ring 14a.

止水用パッキン１４は、溶接により、ガイド管１１に接合さている。つまり、ガイド管１１と止水用パッキン１４の金属リング１４ｂとが溶接により、接合部２０で接合されることにより、ガイド管１１の先端に取り付けられる。 The waterproof packing 14 is joined to the guide pipe 11 by welding. That is, the guide pipe 11 and the metal ring 14b of the waterproof packing 14 are joined at the joint portion 20 by welding, so that the guide pipe 11 is attached to the tip of the guide pipe 11.

ゴムリング１４ａは、円形板状のゴム部材であり、中央に推進管１５が挿通される挿通孔１４ｃが設けられている。挿通孔の大きさは、挿通される推進管１５の口径に応じて決定される。止水用パッキン１４は、ガイド管１１が発進口１０ｂにセットされた後に、ガイド管１１の先端部に取り付けられる。止水用パッキン１４は、金属リング１４ｂとガイド管１１とが溶接により、接合部２０で接合される。なお、金属リング１４ｂとガイド管１１との接合は、溶接には限定されない。止水用パッキン１４は、ガイド管１１の内部を掘削することにより形成される切羽面２１と平行となっている。 The rubber ring 14a is a circular plate-shaped rubber member, and is provided with an insertion hole 14c in which the propulsion pipe 15 is inserted in the center. The size of the insertion hole is determined according to the diameter of the propulsion pipe 15 to be inserted. The water stop packing 14 is attached to the tip of the guide pipe 11 after the guide pipe 11 is set in the starting port 10b. In the water blocking packing 14, the metal ring 14b and the guide pipe 11 are joined at the joint portion 20 by welding. The joining of the metal ring 14b and the guide pipe 11 is not limited to welding. The water blocking packing 14 is parallel to the face surface 21 formed by excavating the inside of the guide pipe 11.

すなわち、本実施形態に係る発進口１０ｂの形成方法は、このような切羽面２１を形成することを可能とするものである。このような切羽面２１を形成しておけば、推進管１５を切羽面２１に対して垂直となるように圧入させれば、小口径の垂直鋼製立坑１０ａからであっても、所望長さの推進管１５を本管１７まで到達させることができる。つまり、口径が小さく、推進管１５を垂直鋼製立坑１０ａの中に水平に入れることができない場合であっても、切羽面２１を形成しておけば、推進管１５を斜めに入れることができるので、垂直鋼製立坑１０ａの口径に左右されずに推進管１５を埋設できる。 That is, the method of forming the starting port 10b according to the present embodiment makes it possible to form such a face surface 21. If such a face surface 21 is formed, if the propulsion pipe 15 is press-fitted so as to be perpendicular to the face surface 21, the desired length can be obtained even from a small-diameter vertical steel shaft 10a. The propulsion pipe 15 of the above can reach the main pipe 17. That is, even if the diameter is small and the propulsion pipe 15 cannot be inserted horizontally into the vertical steel shaft 10a, the propulsion pipe 15 can be inserted diagonally if the face surface 21 is formed. Therefore, the propulsion pipe 15 can be buried regardless of the diameter of the vertical steel shaft 10a.

ここで、図４は、発進口１０ｂを正面から見た斜視図である。なお、図４においては、ガイド管１１の突出部１１ａは、切断されている。そして、ガイド管１１の先端には、止水用パッキン１４が取り付けられている。ゴムリング１４ａの中央には、挿通孔１４ｃが設けられている。止水用パッキン１４においては、ゴムリング１４ａの周縁部を取り囲むように金属リング１４ｂが取り付けられている。そして、挿通孔１４ｃの先には、切羽面２１が見えている。ガイド管１１は、図４の上方から下方に向かって、斜め下方向に圧入されるが、切羽面２１は、ガイド管１１が圧入された圧入方向に対して垂直な面となっている。止水用パッキン１４は、切羽面２１に対して平行となっており、推進管１５を挿通孔１４ｃに挿通させれば、推進管１５は、切羽面２１に対して垂直に推進されることとなる。なお、地盤改良剤１８は、注入口２２から注入される。 Here, FIG. 4 is a perspective view of the starting port 10b as viewed from the front. In FIG. 4, the protruding portion 11a of the guide tube 11 is cut. A water blocking packing 14 is attached to the tip of the guide pipe 11. An insertion hole 14c is provided in the center of the rubber ring 14a. In the waterproof packing 14, a metal ring 14b is attached so as to surround the peripheral edge of the rubber ring 14a. The face surface 21 is visible at the tip of the insertion hole 14c. The guide pipe 11 is press-fitted diagonally downward from the upper side to the lower side in FIG. 4, and the face surface 21 is a surface perpendicular to the press-fitting direction in which the guide pipe 11 is press-fitted. The water blocking packing 14 is parallel to the face surface 21, and if the propulsion pipe 15 is inserted into the insertion hole 14c, the propulsion pipe 15 is propelled perpendicular to the face surface 21. Become. The ground improving agent 18 is injected from the injection port 22.

本実施形態によれば、地上建物や地下構造物の配置条件によらず、所望の長さの推進管を用いて、立坑と本管とを接続することができる。また、小口径の垂直鋼製立坑であっても、推進管を所定の位置まで案内するガイド管を挿入するための坑口を立坑の側壁に形成して、ガイド管を埋設するので、所望の長さの推進管を本管まで到達させることができる。また、ガイド管と垂直鋼製立坑との間、およびガイド管と推進管との間に間詰め材を充填するので、地下水の逆流を確実に防止できる。さらに、ガイド管の先端に止水用パッキンを取り付けるので、同様に地下水の逆流を確実に防止できる。さらにまた、立坑の周囲の地盤と本管の周囲の地盤とに地盤改良剤を注入するので、地下水の逆流を確実に防止できる。 According to this embodiment, the shaft and the main pipe can be connected by using a propulsion pipe having a desired length regardless of the arrangement conditions of the above-ground building and the underground structure. Further, even in a vertical steel shaft having a small diameter, a wellhead for inserting a guide pipe for guiding the propulsion pipe to a predetermined position is formed on the side wall of the shaft to bury the guide pipe, so that the desired length is obtained. The propulsion pipe can reach the main pipe. Further, since the padding material is filled between the guide pipe and the vertical steel shaft and between the guide pipe and the propulsion pipe, the backflow of groundwater can be reliably prevented. Further, since the water blocking packing is attached to the tip of the guide pipe, the backflow of groundwater can be reliably prevented as well. Furthermore, since the ground improvement agent is injected into the ground around the shaft and the ground around the main pipe, the backflow of groundwater can be reliably prevented.

１０ 地盤
１０ａ 垂直鋼製立坑
１０ｂ 発進口
１０ｃ 側壁
１１ ガイド管
１１ａ 突出部
１２ 間詰め材
１３ 掘削機
１４ 止水用パッキン
１４ａ ゴムリング
１４ｂ 金属リング
１４ｃ 挿通孔
１５ 推進管
１６ 間詰め材
１７ 本管
１８ 地盤改良剤
１９ 地下水
２０ 接合部
２１ 切羽面
２２ 注入口
２３ 推進機
10 Ground 10a Vertical steel shaft 10b Start port 10c Side wall 11 Guide pipe 11a Protruding part 12 Filling material 13 Excavator 14 Water stop packing 14a Rubber ring 14b Metal ring 14c Insertion hole 15 Propulsion pipe 16 Filling material 17 Main pipe 18 Ground improvement agent 19 Groundwater 20 Joint 21 Face surface 22 Injection port 23 Propulsion machine

Claims (10)

小口径の垂直鋼製立坑の側壁から、斜め下方の本管に向けて推進管を発進させるための発進口の形成方法であって、
前記側壁に、前記推進管よりも口径の大きなガイド管を挿入するための坑口を形成する工程と、
前記ガイド管を、前記坑口から圧入させる工程と、
圧入された前記ガイド管と前記坑口との隙間に、止水用の第１間詰め材を充填する工程と、
前記ガイド管の内部を掘削する工程と、
前記ガイド管の先端に、前記推進管を挿通させるための挿通孔を有する止水用パッキンを取り付ける工程と、
を含む発進口の形成方法。 It is a method of forming a starting port for starting a propulsion pipe from a side wall of a small-diameter vertical steel shaft toward a main pipe diagonally downward.
A step of forming a wellhead for inserting a guide pipe having a diameter larger than that of the propulsion pipe on the side wall, and
The step of press-fitting the guide pipe from the wellhead and
A step of filling the gap between the press-fitted guide pipe and the wellhead with a first padding material for stopping water, and
The process of excavating the inside of the guide pipe and
A step of attaching a water blocking packing having an insertion hole for inserting the propulsion pipe to the tip of the guide pipe, and
A method of forming a starting port including. 圧入させた前記ガイド管を、前記垂直鋼製立坑の側壁面に沿って切断する工程をさらに含む請求項１に記載の発進口の形成方法。 The method for forming a starting port according to claim 1, further comprising a step of cutting the press-fitted guide pipe along a side wall surface of the vertical steel shaft. 前記発進口の周囲の地盤および前記本管の周囲の地盤に、地盤改良剤を注入する工程をさらに含む請求項１または２に記載の発進口の形成方法。 The method for forming a starting port according to claim 1 or 2, further comprising a step of injecting a ground improving agent into the ground around the starting port and the ground around the main pipe. 前記第１間詰め材は、セメントおよびモルタルの少なくともいずれかを含む請求項１〜３のいずれか１項に記載の発進口の形成方法。 The method for forming a starting port according to any one of claims 1 to 3, wherein the first filling material contains at least one of cement and mortar. 前記止水用パッキンは、ゴムリングを含んで構成される請求項１〜４のいずれか１項に記載の発進口の形成方法。 The method for forming a starting port according to any one of claims 1 to 4, wherein the waterproof packing includes a rubber ring. 前記推進管を、前記挿通孔から、圧入する工程をさらに含む請求項１〜５のいずれか１項に記載の発進口の形成方法。 The method for forming a starting port according to any one of claims 1 to 5, further comprising a step of press-fitting the propulsion pipe from the insertion hole. 前記ガイド管と前記推進管との隙間に第２間詰め材を充填する工程をさらに含む請求項１〜６のいずれか１項に記載の発進口の形成方法。 The method for forming a starting port according to any one of claims 1 to 6, further comprising a step of filling a gap between the guide pipe and the propulsion pipe with a second filling material. 前記第２間詰め材は、セメントおよびモルタルの少なくともいずれかを含む請求項７に記載の発進口の形成方法。 The method for forming a starting port according to claim 7, wherein the second padding material contains at least one of cement and mortar. 小口径の垂直鋼製立坑の側壁から、斜め下方の本管に向けて推進管を発進させるための発進口構造であって、
前記側壁に、前記推進管よりも口径の大きなガイド管を挿入するための坑口を形成する工程と、
前記ガイド管を、前記坑口から圧入させる工程と、
圧入された前記ガイド管と前記坑口との隙間に、止水用の第１間詰め材を充填する工程と、
前記ガイド管の内部を掘削する工程と、
前記ガイド管の先端に、前記推進管を挿通させるための挿通孔を有する止水パッキンを設置する工程と、
を含む発進口の形成方法によって形成される発進口構造。 It is a starting port structure for starting the propulsion pipe from the side wall of a small-diameter vertical steel shaft toward the main pipe diagonally downward.
A step of forming a wellhead for inserting a guide pipe having a diameter larger than that of the propulsion pipe on the side wall, and
The step of press-fitting the guide pipe from the wellhead and
A step of filling the gap between the press-fitted guide pipe and the wellhead with a first padding material for stopping water, and
The process of excavating the inside of the guide pipe and
A step of installing a waterproof packing having an insertion hole for inserting the propulsion pipe at the tip of the guide pipe, and
A starting port structure formed by a method of forming a starting port including. 前記ガイド管の内部を掘削することによって形成される切羽面が、前記ガイド管の圧入方向に対して垂直な面となっている請求項９に記載の発進口構造。
The starting port structure according to claim 9, wherein the face surface formed by excavating the inside of the guide pipe is a surface perpendicular to the press-fitting direction of the guide pipe.
JP2020059555A 2020-03-30 2020-03-30 Formation method of starting port and starting port structure Active JP7389698B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2020059555A JP7389698B2 (en) 2020-03-30 2020-03-30 Formation method of starting port and starting port structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020059555A JP7389698B2 (en) 2020-03-30 2020-03-30 Formation method of starting port and starting port structure

Publications (2)

Publication Number Publication Date
JP2021156097A true JP2021156097A (en) 2021-10-07
JP7389698B2 JP7389698B2 (en) 2023-11-30

Family

ID=77917140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2020059555A Active JP7389698B2 (en) 2020-03-30 2020-03-30 Formation method of starting port and starting port structure

Country Status (1)

Country Link
JP (1) JP7389698B2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08210083A (en) * 1995-02-02 1996-08-13 Houshiyou:Kk Cutoff method and device for pit mouth in underground piping work
JP2000345791A (en) * 1999-06-02 2000-12-12 Kidoh Construction Co Ltd Starting method and arriving method for shield machine
JP2003129790A (en) * 2001-10-29 2003-05-08 Sanwa Kizai Co Ltd Method and device for constructing pit mouth
JP2018003264A (en) * 2016-06-27 2018-01-11 機動建設工業株式会社 Pipeline connection structure and construction method for the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08210083A (en) * 1995-02-02 1996-08-13 Houshiyou:Kk Cutoff method and device for pit mouth in underground piping work
JP2000345791A (en) * 1999-06-02 2000-12-12 Kidoh Construction Co Ltd Starting method and arriving method for shield machine
JP2003129790A (en) * 2001-10-29 2003-05-08 Sanwa Kizai Co Ltd Method and device for constructing pit mouth
JP2018003264A (en) * 2016-06-27 2018-01-11 機動建設工業株式会社 Pipeline connection structure and construction method for the same

Also Published As

Publication number Publication date
JP7389698B2 (en) 2023-11-30

Similar Documents

Publication Publication Date Title
JP2010126996A (en) Method for preventing lining body from floating up
JP2007040018A (en) Tunnel structure for branch section or junction section of underground passage and its execution method
JP5698316B2 (en) Construction method of foundation pile
JP3834571B2 (en) Construction method for underground structures
JP2021156097A (en) Forming method of starting port and starting port structure
JP2009174179A (en) Construction method for shield machine receiving opening, and arrival method for shield machine
JP2683515B2 (en) Male / female joint of earth retaining pipe, connecting device, and method for forming mountain retaining wall using earth retaining pipe
JP6917604B1 (en) Ground reinforcement method
JP2007162323A (en) Wall body forming method and wall body
JP5282542B2 (en) Ground deformation prevention method and ground deformation prevention structure
JP5495874B2 (en) Removal method of shield excavator
JP2013227788A (en) Method for installing underground diagonal member
JP2008255614A (en) Support structure of natural ground and support method of natural ground
KR102191503B1 (en) The Tunnel construction method to use retangular pipe
JP5161948B2 (en) Promotion method
JP6132672B2 (en) Existing pipe renewal method
JP6230284B2 (en) Existing pipe renewal method
JP2001182496A (en) Water leakage measure of tunnel
JPH1163299A (en) Execution method of multi-conduit pipe and multi-conduit pipe
KR102229545B1 (en) Non-excavation construction method of underground structure using steel pipe guide jig
KR100450444B1 (en) Construction Method of Complex Pile Consisting Prestressed spun High strength Concrete Pile and Anchor
KR20230047673A (en) the improvement structure and this formation method of the oscillation work outlet facilitating the input of the propulsion pipe
JP2023123131A (en) Reinforcement structure and reinforcement method of masonry retaining wall as well as tubular reinforcement member
JP2006265894A (en) Underground structure construction method and underground structure
JP2000226982A (en) Grouting reinforcing method in tunnel excavation

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20221007

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230626

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230627

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20230823

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20231031

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20231117

R150 Certificate of patent or registration of utility model

Ref document number: 7389698

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150