JP7389698B2 - Formation method of starting port and starting port structure - Google Patents
Formation method of starting port and starting port structure Download PDFInfo
- Publication number
- JP7389698B2 JP7389698B2 JP2020059555A JP2020059555A JP7389698B2 JP 7389698 B2 JP7389698 B2 JP 7389698B2 JP 2020059555 A JP2020059555 A JP 2020059555A JP 2020059555 A JP2020059555 A JP 2020059555A JP 7389698 B2 JP7389698 B2 JP 7389698B2
- Authority
- JP
- Japan
- Prior art keywords
- starting port
- pipe
- propulsion
- forming
- tube
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 29
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 238000012856 packing Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 18
- 238000003780 insertion Methods 0.000 claims description 17
- 230000037431 insertion Effects 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
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 for forming a starting port and a starting port structure, and particularly to a method for forming a starting port and a starting port structure for launching a propulsion pipe from the 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 launching a propulsion pipe horizontally from the side wall of a shaft toward the main pipe, in which a cylindrical body is placed underground to form a space for inserting the propulsion pipe. A construction method is disclosed in which a propulsion tube is inserted into the installed cylindrical body and propelled.
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 placed horizontally on the bottom of a shaft and is propelled. The cylindrical body had to be sent in sequence through multiple propulsion tubes of corresponding lengths. Therefore, in the construction method described in Patent Document 1, in order to use a propulsion pipe whose length corresponds to the distance between the shaft and the main pipe, it is necessary to form a shaft whose diameter corresponds to the length of the propulsion pipe to be used. I had to. Therefore, depending on the arrangement conditions of above-ground buildings and underground structures, it has been impossible to connect the shaft and the main pipe using a propulsion pipe of 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, a method for forming a starting port according to the present invention includes:
A method for forming a launch port for launching a propulsion pipe from a side wall of a small-diameter vertical steel shaft toward a main pipe diagonally downward, the method comprising:
forming a wellhead in the side wall for inserting a guide pipe having a larger diameter than the propulsion pipe;
Pressing the guide pipe into the wellhead;
filling a gap between the press-fitted guide pipe and the wellhead with a first filling material for water stop;
excavating the inside of the guide tube;
attaching a water stop packing having an insertion hole for inserting the propulsion tube to the tip of the guide tube;
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 includes:
A launch opening structure for launching a propulsion pipe from the side wall of a small-diameter vertical steel shaft toward the main pipe diagonally downward,
forming a wellhead in the side wall for inserting a guide pipe having a larger diameter than the propulsion pipe;
Pressing the guide pipe into the wellhead;
filling a gap between the press-fitted guide pipe and the wellhead with a first filling material for water stop;
excavating the inside of the guide tube;
installing a water-stop packing having an insertion hole for inserting the propulsion tube at the tip of the guide tube;
The starting port is formed by a method of forming a starting port.
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 for forming a starting port of the present invention, a shaft and a main pipe can be connected using a propulsion pipe of a desired length, regardless of the arrangement conditions of above-ground buildings and underground structures.
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 for forming a starting port according to this embodiment will be described with reference to FIGS. 1 to 5. Referring to FIG. 1, the method for forming the launch port according to the present embodiment is to propel the vehicle from the side wall 10c of a 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 a 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 launched from the starting port 10b advances through the ground 10, reaches the main pipe 17, and connects the main pipe 17 with the vertical steel shaft 10a. Since the main pipe 17 and the starting port 10b are located at a lower position than the groundwater 19, the groundwater 19 flows backward while the propulsion pipe 15 is propelling near the midpoint between the vertical steel shaft 10a and the main pipe 17. there is a possibility. Therefore, the ground improvement agent 18 is injected into the ground 10 around the starting port 10b and the ground 10 around the main pipe 17. Note that the improved ground is interrupted in the vicinity of the intermediate point between the vertical steel shaft 10a and the main pipe 17 because the ground improvement agent 18 does not reach there.
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, with reference to FIGS. 2(a) to 2(h), a procedure for forming a starting port according to the present embodiment will be described.
＜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。
<Figure 2(a)>
First, the ground improvement agent 18 is injected into the ground 10 around the vertical steel shaft 10a and the ground 10 around the reach of the propulsion pipe 15 of the main pipe 17, and the side wall 10c of the vertical steel shaft 10a is cut into an oval shape. A starting port 10b is formed as a mine entrance. Note that the length and breadth of the starting port 10b are large enough to allow the guide tube 11 to be inserted therein. The diameter of the guide tube 11 is larger than the diameter of the propulsion tube 15. Here, the diameter of the guide tube 11 is φ900, and the diameter of the propulsion tube 15 is φ700, but the diameters of the guide tube 11 and the propulsion tube 15 are not limited to these.
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 cut into an elliptical shape is to propel the cylindrical guide tube 11 diagonally downward later. That is, the guide pipe 11 and the propulsion pipe 15 having a predetermined length cannot be inserted horizontally into the small-diameter vertical steel shaft 10a. Therefore, in order to insert the guide pipe 11 and the propulsion pipe 15 into the small-diameter vertical steel shaft 10a, they can only be inserted in an oblique state. When the cylindrical guide tube 11 is inserted into the ground 10 from the side wall 10c of the vertical steel shaft 10a in an oblique state, an elliptical hole will be formed in the side wall 10c. Therefore, an elliptical starting port 10b is provided in advance in the side wall 10c of the vertical steel shaft 10a as a hole through which the guide pipe 11 passes.
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。 Note that when the side wall 10c is hollowed out in an elliptical shape and the starting port 10b is provided, the starting port 10b is located at a lower position than the groundwater 19, so if it remains as it is, the groundwater 19 may flow back into the vertical steel shaft 190a. There is sex. Therefore, it is preferable to improve the ground 10 around the starting port 10b by injecting the ground improvement agent 18 into the ground 10 before providing the starting port 10b. Similarly, since the main pipe 17 is also located at a lower level than the groundwater 19, unless the ground 10 around the reach of the propulsion pipe 15 of the main pipe 17 is improved in advance, the propulsion pipe 15 will reach the main pipe 17. When penetrated, groundwater 19 may flow back into main pipe 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。
<Figure 2(b)>
Next, the guide tube 11 is press-fitted through the formed starting port 10b. The guide tube 11 is inserted into the starting port 10b with the guide tube 11 facing diagonally downward, and when the guide tube 11 is press-fitted for a predetermined length, the press-fitting of the guide tube 11 is stopped. The press-fitting length of the guide tube 11 is, for example, such a length that the tip of the guide tube 11 remains within the range where the ground 10 is improved by the soil improvement 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。
<Figure 2(c)>
After the guide tube 11 is press-fitted from the starting port 10b, a water-stopping filler 12 is filled between the press-fitted guide tube 11 and the starting port 10b. The filling material 12 includes at least one of cement and mortar, but may be any material as long as it can prevent the groundwater 19 from flowing in through the gap between the guide pipe 11 and the starting port 10b. Note that the filler material 12 is a material that is filled between members, and here, it is a material that is filled between the guide tube 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。
<Figure 2(d)>
After filling with the filler material 12 is completed, the inside of the guide tube 11 is excavated. Excavation inside the guide pipe 11 is performed by an excavator 13, which scrapes out the ground 10 inside the guide pipe 11 that is still press-fitted. The excavator 13 is, for example, a screw auger, and is a machine that rotates the screw auger by driving an electric or hydraulic motor or the like and excavates the ground 10 while discharging the earth and sand excavated by the tip of the screw auger. Note that the excavator 13 is not limited to a screw auger as long as it is a machine capable of excavating the ground 10, and can also excavate 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。
<Figure 2(e)>
After the interior of the guide pipe 11 has been excavated, the guide pipe 11 is cut along the side wall surface of the vertical steel shaft 10a. Specifically, along the side wall surface of the vertical steel shaft 10a, the protruding portion 11a of the guide pipe 11 press-fitted into the ground 10 that projects into 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 tube 11 along the side wall surface in this way, the propulsion tube 15 can be smoothly guided when the propulsion tube 15 is inserted into the guide tube 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。
<Figure 2(f)>
A water stop packing 14 having an insertion hole 14c through which the propulsion tube 15 is inserted is attached to the tip of the guide tube 11. Since the propulsion tube 15 has a smaller diameter than the guide tube 11, when the propulsion tube 15 is propelled, there is a possibility that the groundwater 19 flows back through the gap between the guide tube 11 and the propulsion tube 15. This is because, in particular, near the midpoint between the starting port 10b and the main pipe 17, there are areas where the ground improvement by the ground improvement agent 18 is insufficient. Therefore, by attaching a water-stop packing 14 to the tip of the guide tube 11, the inflow of groundwater 19 is prevented. Here, since the water stop 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 stop packing 14 are in close contact with each other without a gap, so that underground water can be 19 backflow 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。
<Figure 2 (g)>
The propulsion tube 15 is press-fitted through the insertion hole 14c. The outer diameter of the propulsion tube 15 and the diameter of the insertion hole 14c are approximately the same size, and when the propulsion tube 15 is inserted into the insertion hole 14c, the propulsion tube 15 and the water stop 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 a propulsion device 23, and is propelled 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。
<Figure 2 (h)>
When the propulsion tube 15 is press-fitted so as to reach the main tube 17, it is desirable to fill the gap between the guide tube 11 and the propulsion tube 15 with a filler material 16. In other words, since the propulsion pipe 15 is inserted through the insertion hole 14c of the water stop packing 14, there is a low possibility that backflow of groundwater 19 will occur. 14 can be supported by the filler 16, so the waterproof effect becomes more pronounced. When the propulsion tube 15 reaches the main pipe 17, the press-fitting of the propulsion tube 15 is stopped. Note that the filling material 16 may be filled at the timing shown in FIG. 2(g). Note that the filling material 16 includes 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, with reference to FIGS. 3 and 4, the structure of the starting port 10b and the water stop packing 14 will be described. The water stop packing 14 includes a rubber ring 14a and a metal ring 14b. When viewed in cross section, the water stop packing 14 has a shape in which a metal ring 14b having a U-shaped cross section sandwiches the peripheral edge of a circular flat rubber ring 14a from above and below. In this way, the metal ring 14b is attached to the outer periphery 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 such that two annular metal plates face each other at a predetermined distance. Although the rubber ring 14a is fitted into the metal ring 14b, it may be reinforced by adding an adhesive or the like, for example.
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 water stop packing 14 is joined to the guide tube 11 by welding. That is, the guide tube 11 and the metal ring 14b of the water stop packing 14 are joined at the joint portion 20 by welding, thereby being attached to the tip of the guide tube 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 the center through which the propulsion tube 15 is inserted. The size of the insertion hole is determined according to the diameter of the propulsion tube 15 inserted therethrough. The water stop packing 14 is attached to the tip of the guide tube 11 after the guide tube 11 is set in the starting port 10b. In the water stop packing 14, the metal ring 14b and the guide tube 11 are joined at a joint 20 by welding. Note that the joining of the metal ring 14b and the guide tube 11 is not limited to welding. The water stop packing 14 is parallel to a face surface 21 formed by excavating the inside of the guide tube 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 for forming the starting port 10b according to the present embodiment makes it possible to form such a face surface 21. If such a face 21 is formed, if the propulsion pipe 15 is press-fitted perpendicularly to the face 21, the desired length can be obtained even from a small diameter vertical steel shaft 10a. The propulsion pipe 15 can reach the main pipe 17. In other words, even if the diameter is small and the propulsion tube 15 cannot be inserted horizontally into the vertical steel shaft 10a, if the face 21 is formed, the propulsion tube 15 can be inserted diagonally. 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 viewed from the front. Note that in FIG. 4, the protrusion 11a of the guide tube 11 is cut off. A waterproof packing 14 is attached to the tip of the guide tube 11. An insertion hole 14c is provided in the center of the rubber ring 14a. In the water stop packing 14, a metal ring 14b is attached to surround the peripheral edge of the rubber ring 14a. A face surface 21 is visible beyond the insertion hole 14c. The guide tube 11 is press-fitted obliquely downward from the top to the bottom in FIG. 4, and the face surface 21 is a surface perpendicular to the press-fitting direction in which the guide tube 11 is press-fitted. The water stop packing 14 is parallel to the face surface 21, and when the propulsion tube 15 is inserted into the insertion hole 14c, the propulsion tube 15 is propelled perpendicularly to the face surface 21. Become. Note that the ground improvement 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 using a propulsion pipe of a desired length, regardless of the arrangement conditions of above-ground buildings and underground structures. In addition, even if the shaft is made of vertical steel with a small diameter, the hole opening for inserting the guide tube that guides the propulsion tube to the specified position is formed in the side wall of the shaft, and the guide tube is buried, so the desired length can be achieved. The main propulsion pipe can be reached to the main pipe. Further, since filler is filled between the guide pipe and the vertical steel shaft and between the guide pipe and the propulsion pipe, backflow of groundwater can be reliably prevented. Furthermore, since a water-stop packing is attached to the tip of the guide pipe, it is possible to reliably prevent underground water from flowing back. Furthermore, since the ground improvement agent is injected into the ground around the shaft and the ground around the main pipe, 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 Starting port 10c Side wall 11 Guide pipe 11a Projection 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 22 Inlet 23 Propulsion machine
Claims (9)
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、
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楕円形に切断する工程と、
を含む発進口の形成方法。 A method for forming a launch port for launching a propulsion pipe from a side wall of a small-diameter vertical steel shaft toward a main pipe diagonally downward, the method comprising:
forming a wellhead in the side wall for inserting a guide pipe having a larger diameter than the propulsion pipe;
Pressing the guide pipe into the wellhead;
filling a gap between the press-fitted guide pipe and the wellhead with a first filling material for water stop;
excavating the inside of the guide tube;
attaching a water-stop packing having an insertion hole for inserting the propulsion tube to the tip of the guide tube;
cutting the press-fitted guide pipe into an oval shape along the side wall surface of the vertical steel shaft;
A method of forming a starting port including.
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、
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楕円形に切断する工程と、
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。 A launch opening structure for launching a propulsion pipe from the side wall of a small-diameter vertical steel shaft toward the main pipe diagonally downward,
forming a wellhead in the side wall for inserting a guide pipe having a larger diameter than the propulsion pipe;
Pressing the guide pipe into the wellhead;
filling a gap between the press-fitted guide pipe and the wellhead with a first filling material for water stop;
excavating the inside of the guide tube;
installing a water-stop packing having an insertion hole for inserting the propulsion tube at the tip of the guide tube;
cutting the press-fitted guide pipe into an oval shape along the side wall surface of the vertical steel shaft;
A starting port structure formed by a starting port forming method including.
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 JP2021156097A (en) | 2021-10-07 |
| JP7389698B2 true 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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| 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 |
-
2020
- 2020-03-30 JP JP2020059555A patent/JP7389698B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|---|
| JP2021156097A (en) | 2021-10-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100790547B1 (en) | Method for constructing propulsion base for the construction method for propulsion steelpipe | |
| JP7389698B2 (en) | Formation method of starting port and starting port structure | |
| KR20190139507A (en) | Semi-Shield method propulsion pipe and its watertight structure | |
| JP2007040018A (en) | Tunnel structure for branch section or junction section of underground passage and its execution method | |
| JP2009174179A (en) | Construction method for shield machine receiving opening, and arrival method for shield machine | |
| JP4467477B2 (en) | Entrance entrance for propulsion pipe, structure of entrance for arrival, and water stop method for entrance entrance | |
| JP2003113695A (en) | Method and propelling pipe for forming earth pressure wall | |
| JP2683515B2 (en) | Male / female joint of earth retaining pipe, connecting device, and method for forming mountain retaining wall using earth retaining pipe | |
| JP5495874B2 (en) | Removal method of shield excavator | |
| JP5161948B2 (en) | Promotion method | |
| JP5282542B2 (en) | Ground deformation prevention method and ground deformation prevention structure | |
| JP3710991B2 (en) | Ground reinforcement method | |
| KR100869369B1 (en) | The ground reinforcement apparatus and method grouting type using bundle steel pipe | |
| JP6132672B2 (en) | Existing pipe renewal method | |
| JP6206899B2 (en) | Earth retaining pipe for reaching mine and underground pipe construction method using the same | |
| KR101452180B1 (en) | Non-open cut excavation construction method for underground structure using concrete segment | |
| KR102191503B1 (en) | The Tunnel construction method to use retangular pipe | |
| JP6230284B2 (en) | Existing pipe renewal method | |
| JP3923482B2 (en) | Underground conduit construction method | |
| JP2975560B2 (en) | Underground pipe burial method using shield method by simple segment | |
| JP7002950B2 (en) | Connection structure and connection method between straight pipe roof and reaching tunnel | |
| JP6775414B2 (en) | Ground excavation method | |
| JPH0995943A (en) | Earth anchor execution method in steel pipe column line earth retaining wall | |
| JPH1162466A (en) | Receiving method of shield boring machine into arrival shaft, and structure of receiving part of shield boring machine in arrival shaft | |
| JPH1163299A (en) | Execution method of multi-conduit pipe and multi-conduit pipe |
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 |