JP3348205B2 - Caisson quay - Google Patents
Caisson quayInfo
- Publication number
- JP3348205B2 JP3348205B2 JP18134098A JP18134098A JP3348205B2 JP 3348205 B2 JP3348205 B2 JP 3348205B2 JP 18134098 A JP18134098 A JP 18134098A JP 18134098 A JP18134098 A JP 18134098A JP 3348205 B2 JP3348205 B2 JP 3348205B2
- Authority
- JP
- Japan
- Prior art keywords
- caisson
- earthquake
- quay
- width
- present
- 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 - Lifetime
Links
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- Revetment (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はケーソン式岸壁、特
に耐震性のケーソン式岸壁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson quay, and more particularly to an earthquake-resistant caisson quay.
【０００２】[0002]
【従来の技術】在来のケーソン式岸壁（護岸を含む）は
図３に示すように、ケーソン１の背面２が垂直であり、
地震時の滑動安全性は、背後地盤３からの地震時の水平
方向の土圧４とケーソン慣性力５に対して、ケーソン底
面６の摩擦力７で抵抗することにより確保されている。
なお、８はケーソン自重、９は地震時の鉛直方向の土
圧、１０は裏込石、１１は上部コンクリート、１２は摩
擦増大マット材である。2. Description of the Related Art As shown in FIG. 3, a conventional caisson-type quay (including a revetment) has a rear surface 2 of a caisson 1 which is vertical.
The sliding safety at the time of the earthquake is ensured by resisting the horizontal earth pressure 4 and the caisson inertia force 5 at the time of the earthquake from the back ground 3 by the frictional force 7 of the caisson bottom surface 6.
In addition, 8 is a caisson's own weight, 9 is a vertical earth pressure at the time of an earthquake, 10 is a backing stone, 11 is upper concrete, and 12 is a mat material for increasing friction.
【０００３】以下に示す滑動安全率は１．０以上が用い
られている。[0003] A sliding safety factor of 1.0 or more is used as shown below.
【０００４】 [0004]
【０００５】摩擦係数（μ）：ケーソン底面に摩擦増大
マットが無い場合（μ＝０．６），ケーソン底面に摩擦
増大マットが有る場合（μ＝０．７）Coefficient of friction (μ): When there is no friction increasing mat on the bottom of the caisson (μ = 0.6), when there is a friction increasing mat on the bottom of the caisson (μ = 0.7)
【０００６】[0006]
【発明が解決しようとする課題】然しながら上記従来の
ケーソン式岸壁においては、耐震時の滑動安全性を大き
くするにはケーソン１の幅を大きくする必要があり、コ
スト高となる欠点があった。However, the conventional caisson-type quay has a disadvantage that the width of the caisson 1 must be increased in order to increase the sliding safety during earthquake resistance, resulting in an increase in cost.
【０００７】本発明は上記の欠点を除くようにしたもの
である。The present invention has been made to eliminate the above disadvantages.
【０００８】[0008]
【課題を解決するための手段】本発明のケーソン式岸壁
は、矩形断面のケーソンの背面全体を20〜40度その上面
から下方に向かうに従って次第にその幅が大きくなる方
向に傾斜してその底面の地震時の摩擦力を増大せしめた
ことを特徴とする。The caisson-type quay of the present invention is characterized in that the entire back surface of the caisson having a rectangular cross section has an upper surface of 20 to 40 degrees.
Those whose width gradually increases from down to
It is characterized by increasing the frictional force of the bottom surface during an earthquake by tilting in the direction .
【０００９】[0009]
【発明の実施の形態】以下図面によって本発明の実施例
を説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】本発明においては図１に示すように、ケー
ソン１の背面２を２０〜４０度、好ましくは３０度傾斜
させ、これにより、ケーソン１に作用する地震時の鉛直
方向の土圧９を増大せしめることにより摩擦力を増加さ
せる。In the present invention, as shown in FIG. 1, the back surface 2 of the caisson 1 is inclined by 20 to 40 degrees, preferably 30 degrees, so that the vertical earth pressure 9 acting on the caisson 1 at the time of an earthquake can be reduced. The friction force is increased by increasing it.
【００１１】図２は、従来の設計法に従って同一条件で
地震時滑動安全率に関して従来型ケーソンと本発明の背
面傾斜型ケーソンを比較したものである。FIG. 2 shows a comparison between the conventional caisson and the back-tilted caisson of the present invention with respect to the sliding safety factor during an earthquake under the same conditions according to the conventional design method.
【００１２】なお、本計算での水平震度は０．２５、摩
擦係数は０．７を採用した。縦軸は滑動安全率、横軸は
必要なケーソン幅である。従来型ケーソンは図３に示す
ケーソン幅（Ｂ）を用いている。また、本発明の背面傾
斜型ケーソンはケーソン上端幅（Ｂｕ）と下端幅（Ｂ
Ｌ）の平均値｛（Ｂｕ＋ＢＬ）／２｝を用いている。In this calculation, the horizontal seismic intensity was 0.25 and the friction coefficient was 0.7. The vertical axis is the sliding safety factor, and the horizontal axis is the required caisson width. The conventional caisson uses the caisson width (B) shown in FIG. In addition, the rear inclined caisson of the present invention has a caisson upper end width (Bu) and a lower end width (B).
L) is used as the average value {(Bu + BL) / 2}.
【００１３】地震時滑動安全率が１の場合、従来型はケ
ーソン幅が１６ｍに対して背面傾斜型にした場合はケー
ソン上端と下端の平均値または平均幅は１１．５ｍとな
る。従って、背面傾斜型ケーソンの方がケーソン幅を縮
小でき、経済性が高いことが分かる。When the sliding safety factor during an earthquake is 1, the average value or average width of the upper and lower ends of the caisson is 11.5 m when the caisson width is 16 m in the conventional type and the caisson width is 16 m. Therefore, it can be understood that the caisson width can be reduced and the economical efficiency is higher in the rear inclined caisson.
【００１４】以下水平震度＝０．２５で地震時滑動安全
率がＦｓ＝１の場合の計算例を示す。A calculation example in the case where the horizontal seismic intensity = 0.25 and the sliding safety factor during an earthquake is Fs = 1 will be shown below.
【００１５】 [0015]
【００１６】（１）従来型ケーソン式岸壁（ケーソン幅
Ｂ＝１６ｍ）(1) Conventional caisson quay (caisson width B = 16 m)
【００１７】 [0017]
【００１８】（２）背面傾斜型ケーソン式岸壁（背面傾
斜角＝３０度，平均幅（Ｂｕ＋ＢＬ）／２＝１１．５）(2) Backside inclined caisson quay (backside inclined angle = 30 degrees, average width (Bu + BL) /2=11.5)
【００１９】 [0019]
【００２０】[0020]
【発明の効果】上記のように本発明によれば、在来型の
ケーソンに比べてケーソン幅を縮小することが可能とな
り、経済的な岸壁が可能となる。As described above, according to the present invention, the caisson width can be reduced as compared with a conventional caisson, and an economical quay can be realized.
【図１】本発明のケーソン式岸壁の説明図である。FIG. 1 is an explanatory view of a caisson quay of the present invention.
【図２】本発明のケーソン式岸壁における地震時の滑動
安全率とケーソンの幅との関係を示す線図である。FIG. 2 is a diagram showing the relationship between the sliding safety factor and the width of a caisson in a caisson quay of the present invention during an earthquake.
【図３】従来のケーソン式岸壁の説明図である。FIG. 3 is an explanatory view of a conventional caisson quay.
１ ケーソン ２ 背面 ３ 背後地盤 ４ 地震時の水平方向の土圧 ５ 慣性力 ６ ケーソン底面 ７ 摩擦力 ８ ケーソン自重 ９ 地震時の鉛直方向の土圧 １０ 裏込石 １１ 上部コンクリート １２ 摩擦増大マット材 DESCRIPTION OF SYMBOLS 1 Caisson 2 Back 3 Back ground 4 Horizontal earth pressure at the time of earthquake 5 Inertial force 6 Caisson bottom 7 Friction force 8 Caisson's own weight 9 Vertical earth pressure at the time of earthquake 10 Backing stone 11 Upper concrete 12 Friction increasing mat material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林 健太郎 栃木県那須郡西那須野町四区町1534−１ 五洋建設株式会社 技術研究所内 (72)発明者 小久保 裕 栃木県那須郡西那須野町四区町1534−１ 五洋建設株式会社 技術研究所内 (56)参考文献 実開 昭61−125528（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02B 3/06 E02D 23/00 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Kentaro Hayashi 154-1, Yotsumachi, Nishinasuno-cho, Nasu-gun, Tochigi Prefecture Goyo Construction Co., Ltd. 154-1 Ward Town Goyo Construction Co., Ltd. Technical Research Institute (56) References Real Open Sho 61-125528 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) E02B 3/06 E02D 23/00
Claims (1)
度その上面から下方に向かうに従って次第にその幅が大
きくなる方向に傾斜してその底面の地震時の摩擦力を増
大せしめたことを特徴とするケーソン式岸壁。1. The entire back of a caisson having a rectangular cross section is 20-40.
The width increases gradually from the top to the bottom.
A caisson-type quay characterized by the fact that it is inclined in the direction that it becomes sharper to increase the frictional force of the bottom surface during an earthquake .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18134098A JP3348205B2 (en) | 1998-06-15 | 1998-06-15 | Caisson quay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18134098A JP3348205B2 (en) | 1998-06-15 | 1998-06-15 | Caisson quay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000001829A JP2000001829A (en) | 2000-01-07 |
| JP3348205B2 true JP3348205B2 (en) | 2002-11-20 |
Family
ID=16098995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18134098A Expired - Lifetime JP3348205B2 (en) | 1998-06-15 | 1998-06-15 | Caisson quay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348205B2 (en) |
-
1998
- 1998-06-15 JP JP18134098A patent/JP3348205B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000001829A (en) | 2000-01-07 |
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