JPS62129420A - Reinforcing method for tank foundation ground - Google Patents

Reinforcing method for tank foundation ground

Info

Publication number
JPS62129420A
JPS62129420A JP26780285A JP26780285A JPS62129420A JP S62129420 A JPS62129420 A JP S62129420A JP 26780285 A JP26780285 A JP 26780285A JP 26780285 A JP26780285 A JP 26780285A JP S62129420 A JPS62129420 A JP S62129420A
Authority
JP
Japan
Prior art keywords
tank
ground
foundation ground
foundation
reinforcing
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.)
Pending
Application number
JP26780285A
Other languages
Japanese (ja)
Inventor
Koichi Omori
弘一 大森
Kenichi Komatsu
憲一 小松
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.)
Tonen General Sekiyu KK
Original Assignee
Toa Nenryo Kogyyo KK
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 Toa Nenryo Kogyyo KK filed Critical Toa Nenryo Kogyyo KK
Priority to JP26780285A priority Critical patent/JPS62129420A/en
Publication of JPS62129420A publication Critical patent/JPS62129420A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reinforce foundation ground and to prevent liquidizing phenomenon from being generated during earthquake, by inserting a plurality of stiffeners into the foundation ground, to the lower section of a tank center from the outer peripheral section of the tank, and by fixing the on-ground side end sections of the respective stiffeners. CONSTITUTION:Boring is executed from the outer peripheral section of the filling 2 of a tank foundation, to the lower inclines section to the center of the tank, and stiffeners 3 are inserted into the bored slot, and after that, grout is injected. Near the end sections of the stiffeners 3, concrete is cast to form a concrete ring 5 on the outer periphery of the tank 4. By this method, the foundation ground of the tank is reinforced, and the liquidizing phenomenon of the ground can be prevented from being generated during earthquake.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、タンク基礎地盤の強化方法に関するものであ
り、詳しくは石油タンク等の円筒型タンクの基礎地盤へ
補強材を挿入することにより地盤を強化し、地震時の地
盤の液状化によるタンクおよびタンク基礎の破壊を防止
する方法に関するものである。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for strengthening the foundation ground of a tank. This relates to a method for strengthening tanks and tank foundations to prevent destruction of tanks and tank foundations due to ground liquefaction during earthquakes.

〔従来の技術〕[Conventional technology]

石油タンクは一般に地盤改良等により、ある程度に締め
固められた地盤に砂や砕石で盛土を行い、その上に築造
されているが、特に軟弱地盤においては、地盤改良部お
よびその下部地盤の長期間の圧密沈下により不等沈下が
生じ、タンクの機能上、構造上に問題が生じている例が
多い。
Petroleum tanks are generally built on ground that has been compacted to a certain extent through ground improvement, etc., and is filled with sand or crushed stones. In many cases, uneven settlement occurs due to consolidation settlement, causing problems in the tank's functionality and structure.

しかし、使用されている既存のタンクについては後から
の締め固めや置換による地盤改良はほとんど不可能であ
り、タンクを動かさずに地盤強化することが望まれる。
However, it is almost impossible to improve the ground of existing tanks by compacting them or replacing them afterwards, so it is desirable to strengthen the ground without moving the tanks.

従来このような既存タンクの基礎部の補強を効果的に実
施するために種々の対策が試みられており、例えば特開
昭51−151815号では既設タンクの基礎部に複数
本の鋼管を放射状または互に平行かつタンク底板に対し
て水平に圧入する方法が提案されている。
In the past, various measures have been attempted to effectively reinforce the foundations of existing tanks. For example, in Japanese Patent Application Laid-Open No. 51-151815, multiple steel pipes were installed radially or A method of press-fitting them parallel to each other and horizontally to the tank bottom plate has been proposed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記の先行技術では、比較的浅い部分のタンク基礎の補
強効果は、ある程度期待されるものの、タンク基礎部よ
り下部の地盤の強化はなされていない。
Although the above-mentioned prior art is expected to have some effect of reinforcing the tank foundation in the relatively shallow portion, the ground below the tank foundation is not reinforced.

従って、昭和39年の新潟地震等で見られた様な、深さ
15mにまで及ぶ地震時の地盤液状化により引起こされ
るタンク本体の急激かつ大規模な不等沈下を防止するに
は役に立たないと考えられる。
Therefore, it is useless to prevent the sudden and large-scale uneven settlement of the tank body caused by ground liquefaction during an earthquake up to a depth of 15 meters, such as that seen in the Niigata earthquake of 1963. it is conceivable that.

本発明では、この地震時の地盤液状化により、タンク本
体の破壊に至るような不等沈下が生じるのを防止するこ
とを目的とする。
The present invention aims to prevent uneven subsidence that could lead to destruction of the tank body due to ground liquefaction during an earthquake.

〔問題点を解決するための手段〕 本発明者らは、上記問題点に鑑み棒状の補強材をタンク
外周部からタンク中心下方に向けて基礎地盤中に斜めに
挿入することにより地震時の地盤液状化による不等沈下
量を許容範囲におさえることができ、タンクの破壊を未
然に防ぎうる方法を開発した。
[Means for Solving the Problems] In view of the above problems, the present inventors have proposed that by inserting rod-shaped reinforcing members diagonally into the foundation ground from the outer periphery of the tank toward the bottom of the center of the tank, the ground structure during an earthquake can be improved. We have developed a method that can keep the amount of uneven settlement due to liquefaction within an acceptable range and prevent tank destruction.

本発明の概要を実施例に対応する第1図および第2図を
用いて説明する。
An outline of the present invention will be explained using FIG. 1 and FIG. 2 corresponding to an embodiment.

第1図に示したように、本発明はタンク基礎の盛砂2外
周部から補強材3を斜め方向に挿入することにより、地
震時の地盤液状化が引き起すタンク側壁4a周辺の地盤
の側方への流動を阻止し、タンク4本体の不等沈下を最
小限に抑え、安定した状態を保つように構成される。
As shown in FIG. 1, the present invention inserts reinforcing material 3 in an oblique direction from the outer periphery of the embankment 2 of the tank foundation, so that the side of the ground around the tank side wall 4a, which is caused by ground liquefaction during an earthquake, is It is configured to prevent the tank 4 from flowing in the opposite direction, to minimize uneven settling of the main body of the tank 4, and to maintain a stable state.

補強材は、例えば鉄筋あるいは鋼管の直接打込み、また
はボーリングによる削孔内への補強材の挿入後、モルタ
ルグラウトしたものなどで、直径5011〜120 a
m程度である。
The reinforcing material is, for example, by directly driving reinforcing bars or steel pipes, or by inserting the reinforcing material into a hole by boring and then mortar grouting, and has a diameter of 5011 to 120 a.
It is about m.

補強材の断面形状は円、角等限定されず、材質も鉄に限
らず引張り、および曲げ強度の高いもので耐食性のある
ガラスあるいはカーボン繊維補強材等を用いることもで
きる。
The cross-sectional shape of the reinforcing material is not limited to circular, square, etc., and the material is not limited to iron, but materials with high tensile and bending strength and corrosion resistance, such as glass or carbon fiber reinforcing material, can also be used.

補強材の水平面に対する挿入角度θは10〜70°特に
好ましくは30〜50°とし、基礎地盤の土質、タンク
の規模、施工性等に応し、適宜最適なものを選択する。
The insertion angle θ of the reinforcing material with respect to the horizontal plane is 10 to 70 degrees, particularly preferably 30 to 50 degrees, and is appropriately selected depending on the soil quality of the foundation ground, the scale of the tank, workability, etc.

なお、挿入角度が小さすぎたりあるいは大きすぎると後
述の補強材による拘束作用が不充分となる。
Note that if the insertion angle is too small or too large, the restraint effect by the reinforcing material, which will be described later, will be insufficient.

また補強材は、先端がタンク基礎地盤のほぼ中央付近に
到達しうる程度の長さが必要であり、タンク半径の1.
0〜1.5倍の長さとする。第2図は、タンク基礎地盤
1へ補強材3を一定のピッチaで放射状に配設した状態
を示している。
In addition, the reinforcing material must be long enough so that its tip can reach approximately the center of the tank foundation, and must be long enough to reach approximately the center of the tank foundation.
The length should be 0 to 1.5 times longer. FIG. 2 shows a state in which reinforcing materials 3 are radially arranged on the tank foundation ground 1 at a constant pitch a.

補強材3の配役ピッチaは、タンク4の規模および基礎
地盤1の状態にも依るが通常1〜2mで、密なほど好ま
しい。
The pitch a of the reinforcing materials 3 is usually 1 to 2 m, although it depends on the scale of the tank 4 and the condition of the foundation ground 1, and the denser the pitch, the better.

各補強材の地上端部は、相互に一体化するようにコンク
リート材等で固定しコンクリートリング5を形成する。
The above-ground ends of each reinforcing member are fixed with concrete or the like so as to be integrated with each other to form a concrete ring 5.

〔作  用〕[For production]

本発明のタンク基礎地盤の強化方法が地震時の地盤の液
状化による不等沈下を防ぎうる理由は次のように考えら
れる。
The reason why the method for strengthening the tank foundation ground of the present invention can prevent uneven settlement due to liquefaction of the ground during an earthquake is considered to be as follows.

タンク基礎地盤1は、石油等の内容物による荷重を受け
ているが、タンク4中心部直下が最大で側壁4aに向か
って地盤内応力が小さくなる分布となる。このため、地
盤液状化はタンク中心部より側壁部の方が発生し易すく
、側壁部に沈下が集中する傾向を示している。
The tank foundation ground 1 is subjected to a load due to the contents such as oil, and the stress in the ground is distributed such that the stress in the ground is maximum immediately below the center of the tank 4 and decreases toward the side wall 4a. For this reason, ground liquefaction occurs more easily on the side walls than in the center of the tank, and subsidence tends to concentrate on the side walls.

従って、タンク基礎地盤の周囲に斜め方向から棒状体を
タンク直下部にまで挿入し、頭部を固定することにより
、補強材の両端が拘束され(タンク直下部は上部荷重に
より比較的締まった状態にある)、全体として地盤中に
箱状の形体をなし、液状化時の地盤のタンク周辺部への
移動を拘束することができる。
Therefore, by inserting a rod diagonally around the tank foundation ground to just below the tank and fixing the head, both ends of the reinforcing material are restrained (the area directly below the tank is in a relatively tight state due to the upper load). ), it forms a box-like shape in the ground as a whole, and can restrain the movement of the ground towards the tank surrounding area during liquefaction.

〔実 施 例〕〔Example〕

以下に本発明の一実施例を図面に基づいて説明する。 An embodiment of the present invention will be described below based on the drawings.

図示した実施例では既存のタンク4の底板4b下に敷設
されている盛砂2の外周に幅約1〜2mの溝を掘り、こ
の溝からタンク4の中心下方に向けて斜めのボーリング
を行い削孔を形成する。次にこのボーリング削孔内へ補
強材3として鉄筋(例えばD51程度の鋼棒等)を挿入
し、該削孔と補強材3との間隙に充填材6としてモルタ
ルを注入する(第3図参照)。補強材3の長さはタンク
4の半径程度(必要に応じ1.5倍程度)とし、このよ
うな補強材3をタンク4外周部の前記溝より1〜2mの
ピンチで施工し、タンク4下方の基礎地盤1内に下方向
にすぼまる箱状の補強工を形成する。補強材3の施工後
、前記溝内にコンクリートを打設し、コンクリートリン
グ5を形成することにより、各補強材3の頭部(地上側
端部)が一体向に固定される。
In the illustrated embodiment, a trench with a width of approximately 1 to 2 m is dug around the outer periphery of the embankment 2 laid under the bottom plate 4b of the existing tank 4, and diagonal boring is performed from this trench downward to the center of the tank 4. Form a drilled hole. Next, a reinforcing bar (for example, a steel bar of approximately D51) is inserted into this boring hole as a reinforcing material 3, and mortar is injected as a filler 6 into the gap between the bored hole and the reinforcing material 3 (see Figure 3). ). The length of the reinforcing material 3 is approximately the same as the radius of the tank 4 (approximately 1.5 times as long as necessary), and such reinforcing material 3 is installed at a distance of 1 to 2 m from the groove on the outer periphery of the tank 4. A box-shaped reinforcement work that narrows downward is formed in the foundation ground 1 below. After constructing the reinforcing members 3, concrete is poured into the groove to form a concrete ring 5, thereby fixing the heads (ends on the ground side) of each reinforcing member 3 in one direction.

従って、地震時にタンク側壁4a近傍に局部的な液状化
が発生しても、変位が拘束され、タンク4の破壊に至る
ような不等沈下が防止される。
Therefore, even if local liquefaction occurs near the tank side wall 4a during an earthquake, displacement is restrained, and uneven subsidence that could lead to the destruction of the tank 4 is prevented.

〔発明の効果〕〔Effect of the invention〕

■ 棒状の補強材をタンク外周部からタンク中心下方へ
向けて多数本斜めに施工し、その地上側端部を一体的に
固定することにより、タンク基礎地盤が拘束され、かつ
一体向に働くので、単に地盤の支持強度を増すだけでな
く地震時の地盤液状化による不等沈下量を許容範囲内に
抑えることができる。
■ By constructing multiple rod-shaped reinforcing materials diagonally from the outer circumference of the tank toward the bottom of the center of the tank and integrally fixing the ends on the ground side, the tank foundation ground is restrained and works in one direction. In addition to simply increasing the support strength of the ground, it is also possible to suppress the amount of uneven settlement caused by ground liquefaction during an earthquake to within an allowable range.

■ 地盤を乱すことなく施工でき、補強材を斜めに挿入
するだけなので、既存のタンクに対しても、火気を使用
せず、タンク使用中に施工できる。
■ It can be installed without disturbing the ground, and the reinforcing material is simply inserted diagonally, so it can be installed on existing tanks while the tank is in use without using fire.

■ 補強材が入手しやすく、また一般のアースアンカー
等の工事と同様に施工できるので経済的である。
■ It is economical because reinforcing materials are easily available and construction can be carried out in the same way as for general earth anchors.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明における補強材の配置を示す地盤内縦断
面図、第2図は同じく横断面図、第3図は一実施例にお
ける要部の縦断面図である。 1・・・・・・基礎地盤、2・・・・・・盛砂、3・・
・・・・補強材、4・・・・・・タンク、4a・・・・
・・側壁、4b・・・・・・底板、5・・・・・・コン
クリートリング、6・・・・・・充填材。 第1図      第2図 竺3図
FIG. 1 is a vertical cross-sectional view of the inside of the ground showing the arrangement of reinforcing materials in the present invention, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is a vertical cross-sectional view of essential parts in one embodiment. 1... Foundation ground, 2... Filling sand, 3...
...Reinforcement material, 4...Tank, 4a...
...Side wall, 4b...Bottom plate, 5...Concrete ring, 6...Filling material. Figure 1 Figure 2 Figure 3

Claims (5)

【特許請求の範囲】[Claims] (1)円筒型タンクの外周部からタンク中心下方に向け
て、基礎地盤中に棒状の補強材を所要間隔をおいて多数
本斜めに挿入し、前記各補強材の地上側端部を一体的に
固定することを特徴とするタンク基礎地盤の強化方法。
(1) A large number of rod-shaped reinforcing materials are diagonally inserted into the foundation ground at required intervals from the outer periphery of the cylindrical tank toward the bottom of the center of the tank, and the ground-side ends of each of the reinforcing materials are integrated into one piece. A method for strengthening the foundation ground for a tank, characterized by fixing it to the ground.
(2)各補強材の地上側端部は現場打ちコンクリートリ
ングにより一体的に固定する特許請求の範囲第1項記載
のタンク基礎地盤の強化方法。
(2) The method for strengthening the tank foundation ground according to claim 1, wherein the above ground side end of each reinforcing member is integrally fixed with a cast-in-place concrete ring.
(3)補強材は鉄筋または鋼管である特許請求の範囲第
1項または第2項記載のタンク基礎地盤の強化方法。
(3) The method for strengthening a tank foundation ground according to claim 1 or 2, wherein the reinforcing material is a reinforcing bar or a steel pipe.
(4)補強材の水平面に対する挿入角度は10〜70°
である特許請求の範囲第1項、第2項、または第3項記
載のタンク基礎地盤の強化方法。
(4) The insertion angle of the reinforcing material with respect to the horizontal plane is 10 to 70°
A method for strengthening a tank foundation ground according to claim 1, 2, or 3.
(5)補強材はボーリングによる削孔内に挿入し、間隙
に充填材を注入する特許請求の範囲第1項、第2項、第
3項、または第4項記載のタンク基礎地盤の強化方法。
(5) The method for strengthening the tank foundation ground according to claim 1, 2, 3, or 4, wherein the reinforcing material is inserted into the hole formed by boring, and the filler is injected into the gap. .
JP26780285A 1985-11-28 1985-11-28 Reinforcing method for tank foundation ground Pending JPS62129420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26780285A JPS62129420A (en) 1985-11-28 1985-11-28 Reinforcing method for tank foundation ground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26780285A JPS62129420A (en) 1985-11-28 1985-11-28 Reinforcing method for tank foundation ground

Publications (1)

Publication Number Publication Date
JPS62129420A true JPS62129420A (en) 1987-06-11

Family

ID=17449796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26780285A Pending JPS62129420A (en) 1985-11-28 1985-11-28 Reinforcing method for tank foundation ground

Country Status (1)

Country Link
JP (1) JPS62129420A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07138965A (en) * 1993-11-16 1995-05-30 Ask Kenkyusho:Kk Method of reinforcing ground directly under existing underground structure
JP2014073852A (en) * 2012-10-03 2014-04-24 Ihi Corp Tank body fixing device and tank body fixing method
CN104818737A (en) * 2015-03-18 2015-08-05 山东省水利科学研究院 Tank baseplate taper repair method of large steel vertical storage tank ring wall foundation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07138965A (en) * 1993-11-16 1995-05-30 Ask Kenkyusho:Kk Method of reinforcing ground directly under existing underground structure
JP2014073852A (en) * 2012-10-03 2014-04-24 Ihi Corp Tank body fixing device and tank body fixing method
CN104818737A (en) * 2015-03-18 2015-08-05 山东省水利科学研究院 Tank baseplate taper repair method of large steel vertical storage tank ring wall foundation

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