JP3298468B2 - Liquefaction countermeasures for H-shaped steel piles - Google Patents
Liquefaction countermeasures for H-shaped steel pilesInfo
- Publication number
- JP3298468B2 JP3298468B2 JP21170597A JP21170597A JP3298468B2 JP 3298468 B2 JP3298468 B2 JP 3298468B2 JP 21170597 A JP21170597 A JP 21170597A JP 21170597 A JP21170597 A JP 21170597A JP 3298468 B2 JP3298468 B2 JP 3298468B2
- Authority
- JP
- Japan
- Prior art keywords
- shaped steel
- liquefaction
- ground
- pile
- drainage member
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本願発明は、堤防、建築物、
橋梁、タンク等の土木建築分野の構造物基礎に用いられ
るＨ形鋼杭における液状化対策工法に関するものであ
る。TECHNICAL FIELD The present invention relates to an embankment, a building,
The present invention relates to a liquefaction countermeasure method for H-shaped steel piles used for structural foundations in the field of civil engineering such as bridges and tanks.
【０００２】[0002]
【従来の技術】構造物基礎としての杭は、鋼杭、コンク
リート杭、合成杭等に分類できるが、そのうち鋼杭につ
いてはさらに主なものとして鋼管杭、Ｈ形鋼杭に分類さ
れ、その用途に応じて利用されている。2. Description of the Related Art Piles used as structural foundations can be classified into steel piles, concrete piles, composite piles, etc. Among them, steel piles are further classified into steel pipe piles and H-shaped steel piles. It is used according to.
【０００３】また、液状化のおそれのある地盤に対する
液状化対策として、溝形鋼などの溝状鋼材の所定区間に
多数の開口部を設け、その開口部に土砂侵入防止用のフ
ィルターを取り付けた排水部材を、鋼管杭や鋼矢板に取
り付けた液状化対策工法があり（特開平２−２２５７１
０号公報、特開平２−２２５７１２号公報等参照）、液
状化の発生が予想される地盤に適用されている。Further, as a countermeasure against liquefaction for the ground which may be liquefied, a large number of openings are provided in a predetermined section of a grooved steel material such as a channel steel, and a filter for preventing intrusion of earth and sand is attached to the openings. There is a liquefaction countermeasure method in which a drainage member is attached to a steel pipe pile or steel sheet pile (Japanese Patent Laid-Open No. 22571/1990)
No. 0, JP-A-2-225712, etc.), and is applied to the ground where liquefaction is expected to occur.
【０００４】[0004]
【発明が解決しようとする課題】構造物基礎に、Ｈ形鋼
杭を用いた場合の液状化対策については、従来、以下の
ような課題がある。Problems to be solved by liquefaction when an H-shaped steel pile is used as a structural foundation have the following problems.
【０００５】構造物の周辺地盤について液状化対策を
施しても、周辺地盤から構造物の下方地盤への過剰間隙
水圧の伝達が免れ難い。[0005] Even if liquefaction countermeasures are taken for the surrounding ground of the structure, it is difficult to avoid transmission of excess pore water pressure from the surrounding ground to the ground below the structure.
【０００６】液状化時について、周辺の地盤抵抗を考
慮できない場合、必要な抵抗力をとるため、一般に多数
の鋼杭本数が必要となり、工期、コストの面で難があ
る。In the case of liquefaction, if the surrounding ground resistance cannot be taken into account, a necessary resistance is required, so that a large number of steel piles are generally required, which is difficult in terms of construction period and cost.
【０００７】薬液注入などによる地盤改良工法と併用
する場合もあるが、工期、コストの面で難がある。In some cases, the method may be used in combination with a ground improvement method by injecting a chemical solution or the like, but there are difficulties in terms of work period and cost.
【０００８】本願発明は、上述のような課題の解決を図
ったものであり、基礎杭としてのＨ形鋼杭の近傍に排水
部材を設置し、地震時における杭周辺地盤の液状化を効
果的に抑止し、杭の経済設計および施工性の向上を可能
とするものである。The present invention has been made to solve the above-mentioned problem, and a drainage member is installed near an H-shaped steel pile as a foundation pile to effectively liquefy the ground around the pile during an earthquake. The economic design of piles and the improvement of workability are possible.
【０００９】[0009]
【課題を解決するための手段】本願発明のＨ形鋼杭にお
ける液状化対策工法は、少なくとも液状化の発生するお
それのある地盤内に位置する所定区間について、土砂の
浸入を防ぐためのフィルターを備えた多数の開口部を有
し、内側に排水路を形成する液状化抑止用の排水部材
を、基礎杭としてのＨ形鋼杭の近傍に該Ｈ形鋼杭と直接
接することなく設置したことを特徴とするものである。According to the liquefaction countermeasure method for an H-shaped steel pile of the present invention, a filter for preventing infiltration of earth and sand at least in a predetermined section located in the ground where liquefaction is likely to occur. A liquefaction-preventing drainage member having a large number of openings and forming a drainage channel inside is installed near an H-shaped steel pile as a foundation pile without directly contacting the H-shaped steel pile. It is characterized by the following.
【００１０】地震時の過剰間隙水が、Ｈ形鋼杭の近傍に
設置された排水部材の中を通り、圧力の高まった液状化
層から地表面もしくは地表面付近の砕石層に排出される
ことにより、Ｈ形鋼杭の周辺地盤の液状化が抑止され
る。[0010] The excess pore water of land Shinji is, in the vicinity of the H-shaped steel piles
As the inside of the installed drainage member, by being discharged to the crushed stone layer near the ground surface or the ground surface from the liquid layer of increased the pressure, liquefaction of the surrounding ground of the H-shaped steel piles is suppressed.
【００１１】従って、液状化時でもＨ形鋼杭周辺の地盤
抵抗が考慮可能であり、Ｈ形鋼杭を設計する上で経済設
計となる。 Accordingly, the ground resistance near H-shaped steel piles even during liquefaction are possible consideration, that Do economic design in designing H-beam piles.
【００１２】排水部材の材質としては、鋼製等の金属製
のものや合成樹脂製のもの等が利用できる。断面形状と
しては、円形または角形のパイプ状のものが一般的であ
るが、内側に排水路を形成できるものであれば特に限定
する必要はない。[0012] As the material of the wastewater members, such as those of steel or the like made of metal ones or synthetic resin can be used. The cross-sectional shape is generally a circular or square pipe shape, but there is no particular limitation as long as a drainage channel can be formed inside.
【００１３】また、本願発明では排水部材をＨ形鋼杭と
直接接することなく設置しているが、液状化時における
Ｈ形鋼杭周辺の地盤抵抗を期待できるようにする必要が
あるため、排水部材はその効果でＨ形鋼杭近傍の地盤の
液状化を抑止できる範囲内に納まるようにする。 [0013] Also, the drainage member in the present invention and H-shaped steel piles
Although it is installed without direct contact, it is necessary to be able to expect the ground resistance around the H-shaped steel pile at the time of liquefaction, so the drainage member liquefies the ground near the H-shaped steel pile by its effect. Try to stay within the deterrent range .
【００１４】[0014]
【発明の実施の形態】図１は、Ｈ形鋼杭を堤防、橋梁等
の橋脚基礎に適用した場合の本願発明の一実施形態を示
したものである。 Figure 1 DETAILED DESCRIPTION OF THE INVENTION illustrates an embodiment of the present invention when applied to H-shaped steel pile dike, a pier foundation of bridges and the like.
【００１５】この例は、図に示されるように、矢板７で
仕切られる埋立て地盤内にＨ形鋼杭２によって支持され
る基礎１を構築する場合を想定しており、図中、符号３
が緩い飽和状態の砂地盤からなる液状化のおそれのある
地盤（液状化地盤）である。 In this example, as shown in the figure, it is assumed that a foundation 1 supported by an H-shaped steel pile 2 is constructed in a landfill sectioned by a sheet pile 7, and reference numeral 3 in the figure.
Is Ru Ground (Liquefied Ground) der with risk of liquefaction comprising a sand ground loose saturation.
【００１６】図２〜図７は、本願発明の実施形態におけ
るＨ形鋼杭２近傍の水平断面を示したもので、これらの
例では排水部材５ｂとして開口部を有する合成樹脂製、
合成繊維製等の管にフィルターを設けたものを用いてい
る。 FIGS. 2 to 7 show an embodiment of the present invention.
The horizontal cross section near the H-section steel pile 2 is shown.
In the example, the drainage member 5b is made of a synthetic resin having an opening,
Use a synthetic fiber tube with a filter installed.
You.
【００１７】なお、図示していないが、図２〜図７の排
水部材５ｂの液状化地盤３に位置する区間については、
特開平２−２２５７１０号公報や特開平２−２２５７１
２号公報に記載された排水部材と同様に、土砂侵入防止
用のフィルターを設けた多数の開口部が形成されてい
る。また、この例で排水部材５ｂの上端は杭頭部の排水
処理用砕石層４まで延びている。[0017] Although not shown, the section located in Liquefied Ground 3 exhaust <br/> water members 5b in FIGS. 7,
JP-A-2-225710 and JP-A-2-22571
Similarly to the drainage member described in Japanese Patent Publication No. 2 (1993), a number of openings provided with filters for preventing intrusion of earth and sand are formed. In this example, the upper end of the drainage member 5b extends to the crushed stone layer 4 for drainage treatment at the pile head.
【００１８】地震が発生すると、液状化地盤３中の過剰
間隙水圧が上昇するが、液状化地盤３中の過剰間隙水は
Ｈ形鋼杭２の近傍に設置された排水部材５ｂの開口部か
ら排水部材５ｂ内に流入し、杭頭部の排水処理用砕石層
４へ排水されることにより過剰間隙水圧の上昇が抑制さ
れる。 When an earthquake occurs, the excess pore water pressure in the liquefied ground 3 increases, but the excess pore water in the liquefied ground 3 is released from the opening of the drainage member 5 b installed near the H-shaped steel pile 2. drain member flows into 5b, increase of excess pore water pressure by being drained to the wastewater treatment for crushed stone layer 4 of the pile head Ru is suppressed.
【００１９】図２は排水部材５ｂを両フランジ近傍に直
接接することなく設けた場合、図３は排水部材５ｂを片
フランジの近傍に直接接することなく設けた場合、図４
はウェブの両側近傍に直接接することなく設けた場合、
図５は排水部材５ｂをウェブの片側近傍に直接接するこ
となく設けた場合である。[0019] Figure 2 is the case of providing no direct contact with the drainage member 5b in the vicinity flanges, 3 if provided without contacting directly the drainage member 5b in the vicinity of the single flange, 4
If provided without direct contact with both sides near the web,
FIG. 5 shows a case where the drainage member 5b is provided near one side of the web without directly contacting it.
【００２０】また、図６は排水部材５ｂをＨ形鋼６のウ
ェブの両側に直接接することなく設け、これに加え両フ
ランジ面には他の排水部材５ｂを接するように設けた場
合、図７は排水部材５ｂをＨ形鋼６のウェブの片側に直
接接することなく設け、これに加え他の排水部材５ｂを
両フランジ面に接するように設けた場合である。 ただ
し、図６、図７において、Ｈ形鋼６のフランジ面に接す
るように設けた排水部材５ｂ自体は、本願発明の構成要
件ではない。 FIG. 6 shows that the drainage member 5b is
Without direct contact on both sides of the web.
When the drainage member 5b is provided in contact with the lunge surface,
FIG. 7 shows that the drainage member 5b is directly attached to one side of the web of the H-section steel 6.
It is provided without contact, and in addition to this, another drainage member 5b
This is a case where it is provided so as to be in contact with both flange surfaces. However
6 and FIG. 7, in contact with the flange surface of the H-section steel 6.
The drainage member 5b itself provided as described above is a component of the present invention.
Not a matter.
【００２１】[0021]
【発明の効果】堤防、建築物、橋梁、タンク等の構造
物の基礎としてのＨ形鋼杭近傍における過剰間隙水圧を
逸散せるための排水部材を用いることにより、地震時に
おける構造物の下面および周辺の地盤の液状化を抑止で
き、構造物の地震時の安定性を向上させることができ
る。By using a drainage member for dissipating excess pore water pressure near an H-shaped steel pile as a foundation for structures such as embankments, buildings, bridges, tanks, etc., the lower surface of the structure during an earthquake In addition, liquefaction of the surrounding ground can be suppressed, and the stability of the structure during an earthquake can be improved.
【００２２】Ｈ形鋼杭の周辺地盤の液状化が抑止され
ることで、地震時におけるＨ形鋼杭周辺の地盤抵抗が考
慮可能であり、Ｈ形鋼杭を設計する上で経済設計とな
る。Since the liquefaction of the ground around the H-shaped steel pile is suppressed, the ground resistance around the H-shaped steel pile at the time of the earthquake can be taken into consideration, and the economical design becomes possible when designing the H-shaped steel pile. .
【図１】 本願発明を橋梁の橋脚基礎に適用した場合の
一実施形態を示す鉛直断面図である。1 is a view to lead a straight cross-sectional view of an embodiment in which the present invention is applied to pier foundation of the bridge.
【図２】 本願発明の一実施形態におけるＨ形鋼杭近傍
の水平断面図である。FIG. 2 is a horizontal sectional view of the vicinity of an H-shaped steel pile according to an embodiment of the present invention .
【図３】 本願発明の他の実施形態におけるＨ形鋼杭近
傍の水平断面図である。[3] application to another exemplary H-shaped steel piles near in the form of invention
It is a horizontal sectional view by the side .
【図４】 本願発明のさらに他の実施形態におけるＨ形
鋼杭近傍の水平断面図である。FIG. 4 is a horizontal sectional view showing the vicinity of an H-shaped steel pile according to still another embodiment of the present invention .
【図５】 本願発明のさらに他の実施形態におけるＨ形
鋼杭近傍の水平断面図である。FIG. 5 is a horizontal sectional view showing the vicinity of an H-shaped steel pile according to still another embodiment of the present invention .
【図６】 本願発明のさらに他の実施形態におけるＨ形
鋼杭近傍の水平断面図である。 FIG. 6 shows an H-shape according to still another embodiment of the present invention .
It is a horizontal sectional view near a steel pile.
【図７】 本願発明のさらに他の実施形態におけるＨ形
鋼杭近傍の水平断面図である。 FIG. 7 shows an H-shape according to still another embodiment of the present invention .
It is a horizontal sectional view near a steel pile.
１…基礎、２…Ｈ形鋼杭、３…液状化地盤、４…排水処
理用砕石層、５ｂ…排水部材、６…Ｈ形鋼、７…矢板DESCRIPTION OF SYMBOLS 1 ... Foundation, 2 ... H-shaped steel pile, 3 ... Liquefied ground, 4 ... Crushed layer for wastewater treatment , 5b ... Drainage member, 6 ... H-shaped steel, 7 ... Sheet pile
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平９−95933（ＪＰ，Ａ) 特開 平８−158381（ＪＰ，Ａ) 特開 平９−95934（ＪＰ，Ａ) 特開 平９−137441（ＪＰ，Ａ) 特開 平２−225710（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 3/10 101 ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-9-95933 (JP, A) JP-A-8-158381 (JP, A) JP-A-9-95934 (JP, A) JP-A-9-95 137441 (JP, A) JP-A-2-225710 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) E02D 3/10 101
Claims (1)
る地盤内に位置する所定区間について、土砂の浸入を防
ぐためのフィルターを備えた多数の開口部を有し、内側
に排水路を形成する液状化抑止用の排水部材を、基礎杭
としてのＨ形鋼杭の近傍に該Ｈ形鋼杭と直接接すること
なく設置したことを特徴とするＨ形鋼杭における液状化
対策工法。At least a predetermined section located in the ground where liquefaction is likely to occur, a large number of openings provided with filters for preventing infiltration of earth and sand, and a liquid forming a drainage channel inside. the drainage member for reduction deterrence foundation pile
A liquefaction countermeasure method for an H-shaped steel pile, wherein the method is installed near an H-shaped steel pile as the above without directly contacting the H-shaped steel pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21170597A JP3298468B2 (en) | 1997-08-06 | 1997-08-06 | Liquefaction countermeasures for H-shaped steel piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21170597A JP3298468B2 (en) | 1997-08-06 | 1997-08-06 | Liquefaction countermeasures for H-shaped steel piles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1150441A JPH1150441A (en) | 1999-02-23 |
| JP3298468B2 true JP3298468B2 (en) | 2002-07-02 |
Family
ID=16610234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21170597A Expired - Fee Related JP3298468B2 (en) | 1997-08-06 | 1997-08-06 | Liquefaction countermeasures for H-shaped steel piles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3298468B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012202042A (en) * | 2011-03-24 | 2012-10-22 | Sumitomo Metal Ind Ltd | Combination steel sheet pile having drainage function and wall body structure using the steel sheet pile |
| CN109208628B (en) * | 2018-11-05 | 2020-09-01 | 中国电建集团山东电力建设第一工程有限公司 | Construction method for soft soil cast-in-situ concrete foundation |
-
1997
- 1997-08-06 JP JP21170597A patent/JP3298468B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1150441A (en) | 1999-02-23 |
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