JP2904004B2 - Piping method in soft ground - Google Patents
Piping method in soft groundInfo
- Publication number
- JP2904004B2 JP2904004B2 JP6102601A JP10260194A JP2904004B2 JP 2904004 B2 JP2904004 B2 JP 2904004B2 JP 6102601 A JP6102601 A JP 6102601A JP 10260194 A JP10260194 A JP 10260194A JP 2904004 B2 JP2904004 B2 JP 2904004B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- tube
- soft ground
- sheath
- double
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は透水性の小さい飽和した
粘土質土層や塵芥埋立跡地などの地盤沈下を起こし易い
軟弱地盤に給水管や排水管などを埋設して配管する方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for embedding a water supply pipe or a drain pipe in a soft ground which is apt to cause land subsidence, such as a saturated clayey soil layer having low permeability and a landfill site of garbage. is there.
【0002】[0002]
【従来の技術】地盤に埋設される配管の地盤沈下対策と
しては、建物周辺の配管は、建物の外周に沿った配管は
建物の地下部分と一体化し、外周に沿わない配管は建物
側の端を建物に固定し、屋外側配管との継手に可撓性
(伸縮性)継手を使用して地盤の沈下量を継手で吸収す
る方法が一般的である。そして、屋外一般部は軟弱地盤
に杭を打設して地盤沈下を防止し、杭の上に載置して配
管する方法が一般的である。2. Description of the Related Art As a countermeasure against land subsidence of pipes buried in the ground, pipes around a building are integrated with a pipe along the outer periphery of the building with an underground part of the building, and pipes not along the outer circumference are connected to an end of the building. Is generally fixed to a building, and a flexible (stretchable) joint is used as a joint with the outdoor piping to absorb the settlement amount of the ground with the joint. In general, a method of placing a pile on a soft ground to prevent land subsidence and placing the pile on the pile for piping in a general outdoor area is common.
【0003】[0003]
【発明が解決しようとする課題】杭の打設により地盤沈
下を防止しようとしても杭にかかる反力は配管方向で必
ずしも均等ではなく、時間の経過とともに地盤の不等沈
下を招き、遂には配管の折損事故を起こすことになる。
また、塵芥埋立跡地では杭の打設が困難なばかりでな
く、仮に打設できたとしても長期間にわたる地盤沈下防
止の効果は疑問視される。そのため、地盤に不等沈下を
生じても折損事故を起こすことのない配管方法が求めら
れている。Even if an attempt is made to prevent land subsidence by driving a pile, the reaction force acting on the pile is not always uniform in the direction of the pipes. Will cause a breakage accident.
In addition, not only is it difficult to drive piles at the landfill site, but even if it can be driven, the long-term effect of preventing land subsidence is questioned. Therefore, there is a demand for a piping method that does not cause a breakage accident even if uneven settlement occurs in the ground.
【0004】[0004]
【課題を解決するための手段】本発明は、杭の打設によ
る地盤沈下防止対策を特に採ることなく多少の地盤の不
等沈下が生じても配管自体が不等沈下に追随し配管の折
損事故を起こすことのない配管方法を提供することを目
的とするものである。SUMMARY OF THE INVENTION According to the present invention, even if a slight uneven settlement of the ground occurs without taking special measures for preventing the settlement of the ground by driving a pile, the pipe itself follows the uneven settlement and the pipe is broken. It is an object of the present invention to provide a piping method that does not cause an accident.
【0005】即ち、本発明は波付管を鞘管とし、その内
部に鞘管より長い可撓性内管を挿通した二重管を地盤に
埋設し、鞘管の両端部をマンホール側壁に固定し、内管
の余剰部をループ状に巻いてマンホールに収納すること
を特徴とする軟弱地盤における配管方法にかかるもので
ある。That is, according to the present invention, a corrugated pipe is used as a sheath pipe, and a double pipe in which a flexible inner pipe longer than the sheath pipe is inserted is buried in the ground, and both ends of the sheath pipe are fixed to the side wall of the manhole. In addition, the present invention relates to a piping method in soft ground, characterized in that a surplus portion of an inner pipe is wound in a loop and stored in a manhole.
【0006】本発明は、近年のプラスチック技術の急速
な発展の結果、十分な引張強度、圧縮強度を持ち、且つ
可撓性があり、耐薬品性や耐久性に優れた管を入手し得
るようになったことに基づいてなされた発明である。SUMMARY OF THE INVENTION The present invention is based on the rapid development of plastics technology in recent years. As a result, it is possible to obtain a pipe having sufficient tensile strength and compressive strength, being flexible, having excellent chemical resistance and durability. It is an invention made based on what has become.
【0007】本発明においては、2種類のプラスチック
製管を使用する。In the present invention, two types of plastic tubes are used.
【0008】その1種類は本来の配管を保護する鞘管で
所謂波付管であり、管の円周方向に沿って凹凸が螺旋状
に連続して設けられている。材料としては硬質ポリエチ
レンを主体とするものが代表例として挙げられる。この
波付の形状により直径方向の圧縮強度が高められると共
に可撓性および長手方向の伸びが高められ、長手方向に
は30%程度伸張可能である。さらに、地盤に埋設した
際の他の強度、耐久性も十分使用に耐え得る性能を備え
ている。[0008] One type is a so-called corrugated pipe which is a sheath pipe for protecting the original pipe, and irregularities are continuously provided spirally along the circumferential direction of the pipe. A typical example of the material is a material mainly composed of hard polyethylene. Due to the corrugated shape, the compressive strength in the diameter direction is increased, the flexibility and the elongation in the longitudinal direction are enhanced, and the elongation in the longitudinal direction is about 30%. Furthermore, it also has a performance that can be sufficiently used in other strength and durability when buried in the ground.
【0009】他の1種類は本来の配管である内管で耐薬
品性、耐久性、諸強度の他、ループ状に巻回可能な程度
の可撓性を備えている。かかる可撓性内管が製造される
材料としては架橋ポリエチレンを主体とするもの、アイ
ソタクチックポリブテンを主体とするものが代表例とし
て挙げられる。Another type is an inner pipe which is an original pipe, which has chemical resistance, durability, various strengths, and flexibility enough to be wound in a loop. Representative examples of a material for producing such a flexible inner tube include those mainly composed of crosslinked polyethylene and those mainly composed of isotactic polybutene.
【0010】この2種類のプラスチック製管を組み合わ
せて二重管とするには鞘管の長さより長い可撓性内管を
鞘管に挿通するだけでよいが、鞘管の内径と内管の外径
との差が余り大きくなく、両者の間隙が余り大きくな
く、且つ、容易に挿通できるように鞘管と内管とを選定
する。To combine these two types of plastic tubes into a double tube, it is only necessary to insert a flexible inner tube longer than the length of the sheath tube into the sheath tube. The sheath tube and the inner tube are selected so that the difference between the outer tube and the outer tube is not so large, the gap between them is not so large, and the tube can be easily inserted.
【0011】内管の内径が50mmを越すような大口径に
なると、管材料の選択の範囲が狭くなったり、内管余剰
部の収納場所や収納器具が大きくなり施工が難しくなる
場合がある。そのような場合には、一本の二重管に代え
て小口径の複数の二重管に並列に分岐させて配管する。If the inner diameter of the inner pipe is larger than 50 mm, the range of choice of the pipe material may be narrowed, or the storage space and storage equipment for the surplus portion of the inner pipe may be increased, making construction difficult. In such a case, instead of one double pipe, a plurality of small-diameter double pipes are branched and connected in parallel.
【0012】[0012]
【実施例】以下、図面を参照しながら本発明について説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【0013】図1(a)は本発明で使用する二重管の一
例を示す一部切り欠き側面図であり、図1(b)は二重
管を軟弱地盤に埋設して配管した一例を示す縦断面図で
あり、図1(c)は図1(b)で配管後、軟弱地盤が不
等沈下した状態での配管の状態を示す縦断面図である。FIG. 1 (a) is a partially cutaway side view showing an example of a double pipe used in the present invention, and FIG. 1 (b) shows an example in which the double pipe is buried in soft ground and piped. FIG. 1C is a longitudinal sectional view showing a state of the piping in a state where the soft ground has unequally settled after the piping in FIG. 1B.
【0014】図1(a)に示されるように二重管6は硬
質ポリエチレンを主体とする材料から製造された波付管
である鞘管1の内部に、架橋ポリエチレンを主体とする
材料から製造された可撓性内管2が挿通され、可撓性内
管2は鞘管1の長さより相当に長いものが使用されてい
る。As shown in FIG. 1 (a), the double pipe 6 is made of a material mainly composed of crosslinked polyethylene inside a sheath tube 1 which is a corrugated pipe mainly composed of a hard polyethylene. The flexible inner tube 2 is inserted, and the flexible inner tube 2 is considerably longer than the length of the sheath tube 1.
【0015】配管に際しては、図1(b)に示されるよ
うに鞘管1の両端をマンホール3A、3Bの側壁に固定
し、可撓性内管2の両端をバルブ5、5に接続する、可
撓性内管2の余剰部は巻取器4(巻取器4は中央に直立
した棒を有する枠体と、中心に鉛直方向の貫通孔を有す
る円錐台形の巻取器本体から構成され、巻取器本体の貫
通孔に枠体の棒が挿通されている。)に巻いて軽く固定
し、一方のマンホール3A内に収納する。この二重管6
を軟弱地盤に埋設する。二重管6を埋設する際の埋め戻
し土には砂を主体とするものを使用して二重管6と地盤
との摩擦抵抗をできるだけ小さくしておくのが好まし
い。At the time of piping, both ends of the sheath tube 1 are fixed to the side walls of the manholes 3A and 3B, and both ends of the flexible inner tube 2 are connected to the valves 5 and 5, as shown in FIG. The surplus portion of the flexible inner tube 2 is taken up by the winder 4 (the winder 4 is upright at the center.
Frame with vertical bar and vertical through hole at center
Frustoconical winder main body,
The rod of the frame is inserted through the through hole. ) And lightly fixed, and housed in one manhole 3A. This double tube 6
Is buried in soft ground. It is preferable that the backfill soil at the time of burying the double pipe 6 is mainly made of sand, and the frictional resistance between the double pipe 6 and the ground is made as small as possible.
【0016】配管後、軟弱地盤に不等沈下が生ずると、
図1(c)に示されるように鞘管1は伸張するとととも
に可撓性内管2に張力を発生させ、その張力により巻取
器本体が貫通孔に挿通されている棒を中心として回転
し、巻取器4に巻かれていた余剰部の可撓性内管2が解
きほどかれて鞘管1内に送り込まれ、不等沈下による力
を吸収する。従って、不等沈下が生じても可撓性内管2
に異常な応力が発生することはない。After the piping, if uneven settlement occurs in the soft ground,
Sheath pipe 1 as shown in FIG. 1 (c) with extension Then the
A tension is generated in the flexible inner tube 2 and the winding is performed by the tension.
The container body rotates around the rod inserted through the through hole
And, winder 4 wound flexible inner tube 2 of the surplus portion had the solving Ho Doka is being fed into the sheath tube 1, to absorb the forces due to uneven settlement. Therefore, even if uneven settlement occurs, the flexible inner tube 2
No abnormal stress is generated.
【0017】二重管6を配管するマンホール3A、3B
の距離が長くなり、想定される地盤沈下量に見合うだけ
の可撓性内管2余剰部の長さをマンホール3Aに収納し
切れないと考えられる時は途中にさらにマンホールを設
けて、二重管6を直列に複数に分割することで対応す
る。Manholes 3A and 3B for piping the double pipe 6
If it is considered that the extra length of the flexible inner pipe 2 that is sufficient for the expected amount of land subsidence cannot be accommodated in the manhole 3A, an additional manhole is provided in the middle, and This is achieved by dividing the tube 6 into a plurality of tubes in series.
【0018】図2は建造物の敷地内の軟弱地盤に小口径
の二重管のみで配管した一例を示す平面図であり、
(a)は全体図、(b)は(a)のB部の拡大図、
(c)は(a)のC部の拡大図、(d)は(a)のD部
の拡大図、(e)は(a)のE部の拡大図である。FIG. 2 is a plan view showing an example in which only small-diameter double pipes are laid on soft ground on the site of a building,
(A) is an overall view, (b) is an enlarged view of part B of (a),
(C) is an enlarged view of a portion C of (a), (d) is an enlarged view of a D portion of (a), and (e) is an enlarged view of an E portion of (a).
【0019】給水本管11に接続する給水管には大口径
の配管一本ではなく、内管内径40mmの二重管6を3本並
列して使用し、汚水雑排水を浄化槽9に圧送する汚水雑
排水圧送管も大口径の配管一本ではなく、内管内径40mm
の二重管6を2本並列して使用した例である。並列に分
岐したり、分岐したものを集合するには、通常の通り、
ヘッダー10が使用される。The water supply pipe connected to the water supply main pipe 11 is not a single large-diameter pipe, but three parallel pipes 6 having an inner pipe inner diameter of 40 mm. Sewage drainage pumping pipe is not a single large-diameter pipe, but the inner pipe inner diameter is 40 mm
This is an example in which two double tubes 6 are used in parallel. To branch in parallel or to aggregate the branches, as usual,
The header 10 is used.
【0020】[0020]
(1)二重管を使用するので、内管は機械的にも化学的
にも十分保護される。(1) Since a double tube is used, the inner tube is sufficiently protected both mechanically and chemically.
【0021】(2)鞘管は伸張可能であり、内管は可撓
性で余剰部を持っているので、不等沈下に追随可能であ
り、不等沈下により異常な力が配管に加わることはな
い。(2) Since the sheath tube is extendable and the inner tube is flexible and has a surplus portion, the sheath tube can follow uneven settlement, and an abnormal force is applied to the pipe due to uneven settlement. There is no.
【0022】(3)大口径二重管一本に代えて、並列に
分岐した二本以上の小口径二重管を使用する場合は、取
替え工事中の完全断水が必要でなく、取替え工事中も給
水可能となる。また、施工も容易になる。(3) When two or more small-diameter double pipes branched in parallel are used instead of one large-diameter double pipe, complete water cutoff during replacement work is not necessary, and Can be supplied with water. Also, the construction becomes easy.
【図1】(a)は本発明で使用する二重管の一例を示す
一部切り欠き側面図であり、(b)は二重管を軟弱地盤
に埋設して配管した一例を示す縦断面図であり、(c)
は(b)で配管後、軟弱地盤が不等沈下した状態での配
管の状態を示す縦断面図である。FIG. 1A is a partially cutaway side view showing an example of a double pipe used in the present invention, and FIG. 1B is a longitudinal section showing an example in which the double pipe is buried in soft ground and piped. FIG.
FIG. 4B is a longitudinal sectional view showing a state of the pipe in a state in which the soft ground has unequally settled after the pipe in FIG.
【図2】建造物の敷地内の軟弱地盤に小口径の二重管の
みで配管した一例を示す平面図であり、(a)は全体
図、(b)は(a)のB部の拡大図、(c)は(a)の
C部の拡大図、(d)は(a)のD部の拡大図、(e)
は(a)のE部の拡大図である。FIG. 2 is a plan view showing an example in which only a small-diameter double pipe is used for piping on soft ground in a building site, (a) is an overall view, and (b) is an enlarged view of a portion B in (a). FIG. 3C is an enlarged view of a portion C in FIG. 4A, FIG. 4D is an enlarged view of a portion D in FIG.
3 is an enlarged view of a portion E in FIG.
1・・鞘管、2・・可撓性内管、3,3A,3B・・マ
ンホール、4・・巻取器、5・・バルブ、6・・二重
管、7・・建造物、8・・散水栓、9・・浄化槽、10
・・ヘッダー、11・・給水本管。1. sheath tube, 2. flexible inner tube, 3, 3A, 3B manhole, 4. winder, 5. valve, 6. double tube, 7. building 8. ..Watering faucets, 9 septic tanks, 10
··· Header, 11 ·· Main water supply mains.
Claims (2)
て設けられている管(以下波付管という)を鞘管とし、
その内部に鞘管より長い可撓性内管を挿通した二重管を
地盤に埋設し、鞘管の両端部をマンホール側壁に固定
し、内管の余剰部をループ状に巻いてマンホールに収納
することを特徴とする軟弱地盤における配管方法。1. A tube in which irregularities are continuously provided spirally along the circumferential direction (hereinafter referred to as a corrugated tube) as a sheath tube,
A double pipe with a flexible inner pipe longer than the sheath pipe is buried in the ground, the both ends of the sheath pipe are fixed to the side wall of the manhole, and the excess part of the inner pipe is wound in a loop and stored in the manhole. Piping method in soft ground characterized by performing.
した二本以上の小口径二重管を使用する請求項1記載の
軟弱地盤における配管方法。2. The piping method in soft ground according to claim 1, wherein two or more small-diameter double pipes branched in parallel are used instead of one large-diameter double pipe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6102601A JP2904004B2 (en) | 1994-05-17 | 1994-05-17 | Piping method in soft ground |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6102601A JP2904004B2 (en) | 1994-05-17 | 1994-05-17 | Piping method in soft ground |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07310858A JPH07310858A (en) | 1995-11-28 |
JP2904004B2 true JP2904004B2 (en) | 1999-06-14 |
Family
ID=14331761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6102601A Expired - Fee Related JP2904004B2 (en) | 1994-05-17 | 1994-05-17 | Piping method in soft ground |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2904004B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8490703B2 (en) | 2009-02-12 | 2013-07-23 | Red Leaf Resources, Inc | Corrugated heating conduit and method of using in thermal expansion and subsidence mitigation |
-
1994
- 1994-05-17 JP JP6102601A patent/JP2904004B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07310858A (en) | 1995-11-28 |
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Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990223 |
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LAPS | Cancellation because of no payment of annual fees |