JPH0438849B2 - - Google Patents
Info
- Publication number
- JPH0438849B2 JPH0438849B2 JP60255761A JP25576185A JPH0438849B2 JP H0438849 B2 JPH0438849 B2 JP H0438849B2 JP 60255761 A JP60255761 A JP 60255761A JP 25576185 A JP25576185 A JP 25576185A JP H0438849 B2 JPH0438849 B2 JP H0438849B2
- Authority
- JP
- Japan
- Prior art keywords
- jack
- main body
- cutting edge
- open caisson
- hole type
- 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
- 238000010276 construction Methods 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 10
- 238000009412 basement excavation Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- -1 earth Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明はケーソン基礎、その他土木建築用地下
構造物（以下オープンケーソンと称す）を所定の
深度まで沈設するために用いるオープンケーソン
の構造及びその沈設工法に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to the structure of an open caisson used for sinking caisson foundations and other underground structures for civil engineering and construction (hereinafter referred to as open caisson) to a predetermined depth, and its structure. This relates to the submerged construction method.
＜従来の技術＞
オープンケーソン沈設工法は潜函沈下工法とも
称されるもので、保護壁となる躯体の下方へ刃口
を設けたオープンケーソンを用いる工法である。
したがつて、その沈設工法はクラムシエルバケツ
トなどの掘削機械で躯体内部の土砂を掘り下げな
がら所定の深度まで沈下させていた。しかし、躯
体の側面の周面摩擦抵抗や刃先の先端抵抗及び浮
力などにより、躯体の自重だけでは沈下力が不足
し沈下しなくなることがある。<Conventional Technology> The open caisson sinking method is also called the submerged box sinking method, and is a construction method that uses an open caisson with a cutting edge located below the frame that serves as a protective wall.
Therefore, the submersion method involved using excavating machines such as a clamshell bucket to dig up the earth and sand inside the structure until it sank to a predetermined depth. However, due to the circumferential frictional resistance on the sides of the body, the tip resistance of the cutting edge, buoyancy, etc., the weight of the body alone may not provide sufficient sinking force, and the body may not sink.
このような場合、従来の工法では躯体上部に
水、土砂、鋼材などで荷重を載荷したり（特公昭
43−1712号）、予めケーソン側壁部に摩擦減少装
置を取付けておき、周辺摩擦抵抗を軽減して沈下
を促進させるとか、下端を土中に固定したアース
アンカー（引張部材）をオープンケーソンに支持
して、そのアースアンカーに反力をとりジヤツキ
で圧入する（特公昭48−13651号、同48−20247
号）とか、躯体内底部地盤でダイナマイトを起爆
させて躯体に振動を与えるなどの方法で沈下を行
なつていた。 In such cases, conventional construction methods involve loading the upper part of the structure with water, earth, sand, steel, etc.
43-1712), a friction reduction device is installed on the side wall of the caisson in advance to reduce peripheral frictional resistance and promote settlement, or an earth anchor (tension member) with its lower end fixed in the soil is supported on the open caisson. Then, take the reaction force and press-fit it into the earth anchor with a jack (Special Publication No. 48-13651, No. 48-20247)
Subsidence was carried out by methods such as detonating dynamite in the ground at the bottom of the structure and causing vibrations to the structure.
＜発明が解決しようとする問題点＞
しかし、上部へ重量物を載荷するにも限度があ
り、また、躯体の開口部が減少して掘削効率が低
下し、載荷により重心がくなり躯体の偏心や傾
斜が生じ易くなる難点があつた。アースアンカー
を用いる方法は、アースアンカーが価で不経済
な上に、躯体の継ぎ足し毎に架払いが必要であ
る。更に、ダイナマイトの使用は、躯体が損傷し
たり、周辺の家屋や構造物にも振動を与える場合
があつて、好ましくない。本発明はこのような従
来のオープンケーソンの難点を解決して、ケーソ
ン基礎等の地下構造物を円滑に沈設することを目
的として開発したのである。<Problems to be solved by the invention> However, there is a limit to loading heavy objects to the upper part, and the opening of the structure decreases, reducing excavation efficiency, and the center of gravity shifts due to loading, causing eccentricity of the structure There was a problem in that it was prone to tilting. In the method of using earth anchors, the earth anchors are expensive and uneconomical, and additionally, it is necessary to remove the bridge each time a frame is added. Furthermore, the use of dynamite is undesirable because it may damage the building frame or cause vibrations to surrounding houses and structures. The present invention was developed with the aim of solving the problems of conventional open caissons and allowing underground structures such as caisson foundations to be sunk smoothly.
＜問題点を解決するための手段＞
上記のような問題点を解決するために、本発明
においては、沈設するオープンケーソンの躯体を
刃口部分と本体部分とに分離して構築し、刃口部
分と本体部分との間に複数の直列２連のセンター
ホール型ジヤツキを設置し、躯体の本体部分の自
重を反力にしてエンターホール型ジヤツキの下方
圧入用ジヤツキ６の操作で刃口部分を圧入しなが
ら掘削した底面土中に圧入すると共に、センター
ホール型ジヤツキの上方吊上げ用ジヤツキ７を伸
ばして刃口部分を吊り上げ、本体部分の自重を刃
口部分へ掛けて、本体部分を沈設する工法を開発
したのである。<Means for Solving the Problems> In order to solve the above-mentioned problems, in the present invention, the frame of the open caisson to be sunk is constructed separately into a cutting part and a main part, and the cutting part is separated from the main part. A plurality of two center hole type jacks are installed in series between the part and the main body part, and the cutting edge part is moved by operating the downward press-fitting jack 6 of the enter hole type jack using the weight of the body part of the frame as a reaction force. A construction method in which the main body is press-fitted into the excavated bottom soil, and the upper lifting jack 7 of the center hole type jack is extended to lift the cutting edge part, and the body part's own weight is applied to the cutting edge part, and the main body part is sunk. was developed.
ここで用いるオープンケーソンは、刃口部分１
と本体部分２とに刃口近傍の水平面により分離
し、刃口部分１には外周上面にジヤツキのストロ
ークをカバーする長さに突出したガイド板３と内
周面に突出する複数の刃口ジヤツキ受４を設け、
本体部分２の下面の前記刃口ジヤツキ受４に対応
する位置に本体ジヤツキ受５を設け、刃口ジヤツ
キ受４と本体ジヤツキ受５に対して直列２連のセ
ンターホール型ジヤツキとした構造を例示するこ
とができる。 The open caisson used here is
and the main body part 2 are separated by a horizontal plane near the cutting edge, and the cutting edge part 1 has a guide plate 3 protruding from the upper surface of the outer periphery to a length that covers the stroke of the jack, and a plurality of cutting edge jacks protruding from the inner circumferential surface. Set up receiver 4,
An example of a structure is shown in which a main body jack holder 5 is provided on the lower surface of the main body portion 2 at a position corresponding to the knife edge jack holder 4, and two center hole type jacks are connected in series to the blade edge jack holder 4 and the main body jack holder 5. can do.
＜作用＞
このような装置及び工法によれば、刃口部分１
が本体部分２と分離されているので、刃口部分１
にかかる側面の周面摩擦抵抗は、躯体全体にかか
る場合に比べて極めて小さく、躯体の本体部分の
自重を反力にしてジヤツキ操作で刃口部分を掘削
した底面土中に圧入することができる。刃口部分
１の圧入を終えたのち、ジヤツキ操作により本体
部分２を下げる。本体部分２は刃口部分１に設け
られたガイド板３に沿つて容易に下がる。この動
作を繰返すことによりオープンケーソンの全体を
沈下させることができるのである。<Operation> According to such a device and construction method, the blade mouth portion 1
is separated from the main body part 2, so the blade part 1
The circumferential frictional resistance on the sides is extremely small compared to that applied to the entire structure, and the cutting edge can be press-fitted into the excavated bottom soil using a jacking operation using the weight of the main body of the structure as a reaction force. . After the cutting edge portion 1 is press-fitted, the main body portion 2 is lowered by jacking. The main body part 2 is easily lowered along a guide plate 3 provided at the blade mouth part 1. By repeating this action, the entire open caisson can be lowered.
＜実施例＞
以下図面によつて本発明の実施例を詳細に説明
する。<Examples> Examples of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の装置を示す縦断面図であり、
第２図は刃口部分の横断面図である。第３図〜第
６図は施工の様子を示す縦断面図である。 FIG. 1 is a longitudinal sectional view showing the device of the present invention,
FIG. 2 is a cross-sectional view of the cutting edge portion. FIGS. 3 to 6 are longitudinal cross-sectional views showing the construction process.
本発明の工法を説明する前に、初めに新しく開
発されたオープンケーソンを説明する。 Before explaining the construction method of the present invention, we will first explain the newly developed open caisson.
このオープンケーソンは刃口部分１と本体部分
２とに刃口近傍の水平面により分離されている。
刃口部分には外周上面に突出した筒状のガイド板
３と内周面に突出する梁構造の複数の刃口ジヤツ
キ受４が設けられている。ガイド板３は本体部分
２の外径よりも大きい内径を有している。本体部
分２の下面の前記刃口ジヤツキ受４に対応する位
置にこれも梁構造の本体ジヤツキ受５が設けら
れ、その間に圧入用ジヤツキ６が設けられてい
る。本体部分２の上面には吊上げ用ジヤツキ７が
設けられており、これらのジヤツキ６，７を同軸
に取付けられており、加圧自在に油圧ユニツト８
に連結されている。刃口部分１の水平を保つため
に、刃口部分の上面にはレベルセンサー９が設け
られている。このような構造に付随して、本体部
分２へ従来公知の周面摩擦減少装置を設けること
ができる。上記ガイド板３は刃口部分１の外周の
全周でなくても、各コーナー部と側面の一部に必
要により部分的に設置してもよい。また、刃口ジ
ヤツキ受４、本体ジヤツキ受５の梁は片持梁構造
として中間を省略することも強度との関係で任意
に選択可能である。 This open caisson is divided into a cutting edge part 1 and a main body part 2 by a horizontal plane near the cutting edge.
At the cutting edge portion, a cylindrical guide plate 3 protruding from the upper surface of the outer periphery and a plurality of blade jack jack holders 4 having a beam structure projecting from the inner circumferential surface are provided. The guide plate 3 has an inner diameter larger than the outer diameter of the main body portion 2. A main body jack holder 5, which also has a beam structure, is provided at a position corresponding to the blade edge jack holder 4 on the lower surface of the main body portion 2, and a press-fitting jack 6 is provided between them. A lifting jack 7 is provided on the upper surface of the main body portion 2, and these jacks 6 and 7 are attached coaxially to a hydraulic unit 8 so as to be able to pressurize freely.
is connected to. In order to keep the blade edge portion 1 horizontal, a level sensor 9 is provided on the upper surface of the blade edge portion. In conjunction with such a structure, the body portion 2 can be provided with a conventionally known circumferential friction reducing device. The guide plate 3 does not have to be installed all around the outer periphery of the cutting edge portion 1, but may be installed partially at each corner and a part of the side surface as necessary. Further, the beams of the blade edge jack holder 4 and the main body jack holder 5 can be constructed as cantilever beams, omitting the middle part, which can be selected as desired in view of strength.
次に本発明の方法を説明する。 Next, the method of the present invention will be explained.
第３図から第６図によつて本発明の方法が明ら
かであるが、第３図は掘削を行なつた後、初期沈
下を行なつた状態を示している。この時点で通常
は周面摩擦と刃先の先端抵抗の増大で躯体の重量
のみでは沈下しなくなる。ところが、本発明にお
いては、掘削を行ないながら、ここで第４図のよ
うに油圧ユニツト８により圧入ジヤツキ６を作動
させて躯体重量を反力に刃口部分１を圧入する。
この時の沈下抵抗は刃先抵抗と刃口部分１の周面
摩擦のみであるので、圧入が容易にできる。刃口
部分１を圧入すると同時に圧入用ジヤツキ６を元
に戻すと同時に吊上げ用ジヤツキ７で刃口を吊上
げると刃口部分の重量が増大するため、本体部分
２が刃口部分１のガイド板３に沿つて容易に沈下
するのである。この操作は刃口部分１に設けられ
たレベルセンサー９によつて圧入時の傾斜が管理
され、刃口部分１の姿勢を制御しつつ沈下させる
のである。 The method of the invention is clearly illustrated in FIGS. 3 to 6, which show the initial settlement after excavation. At this point, the weight of the frame alone is no longer sufficient to sink the blade due to increased circumferential friction and increased tip resistance. However, in the present invention, while excavating, the press-fitting jack 6 is actuated by the hydraulic unit 8 as shown in FIG. 4, and the cutting edge portion 1 is press-fitted using the body weight as a reaction force.
Since the sinking resistance at this time is only the resistance at the cutting edge and the friction on the circumferential surface of the cutting edge portion 1, press-fitting can be easily performed. If the blade mouth part 1 is press-fitted and the press-fitting jack 6 is returned to its original position at the same time, the blade mouth is lifted up with the lifting jack 7, the weight of the blade mouth part increases, so the main body part 2 becomes a guide plate for the blade mouth part 1. 3, it sinks easily. In this operation, the inclination during press-fitting is controlled by the level sensor 9 provided at the blade mouth part 1, and the posture of the blade mouth part 1 is controlled and lowered.
この操作と掘削の繰返しにより躯体を沈設して
いくが、沈下深度が深くなると、周面摩擦抵抗の
増大で刃口部分１を圧入しても躯体が沈下しない
ことがある。そのような時、第５図に示したよう
に、圧入用ジヤツキ６を縮め、吊上げ用ジヤツキ
７で先に圧入した刃口部分１を吊上げる。このこ
とによつて、刃先抵抗が無くなり躯体の重量が増
大して第６図のように沈下し易くなるのである。
この時、周面摩擦減少装置を設けていると、容易
に所定の深度まで沈設することができる。 By repeating this operation and excavation, the frame is sunk, but as the sinking depth increases, the body may not sink even if the cutting edge portion 1 is press-fitted due to an increase in frictional resistance on the circumferential surface. In such a case, as shown in FIG. 5, the press-fitting jack 6 is retracted, and the lifting jack 7 is used to lift up the blade part 1 that was press-fitted first. This eliminates the resistance at the cutting edge and increases the weight of the body, making it easier to sink as shown in FIG.
At this time, if a circumferential friction reducing device is provided, it can be easily sunk to a predetermined depth.
＜発明の効果＞
本発明の方法及びオープンケーソンの完成によ
つて、外周に矢板を設けるとか、アースアンカー
を設けて引張らなくとも、沈下力を得ることがで
き、施工期間の短縮と、経費節減、及び安定なケ
ーソン沈設を可能としたのである。<Effects of the Invention> By the method of the present invention and the completion of the open caisson, sinking force can be obtained without providing sheet piles on the outer periphery or providing earth anchors for tension, shortening the construction period and reducing costs. This enabled savings and stable caisson installation.
第１図は本発明の装置を示す縦断面図であり、
第２図は刃口部分の横断面図である。第３図〜第
６図は施工の様子を示す縦断面図である。
１……刃口部分、２……本体部分、３……ガイ
ド板、４……刃口ジヤツキ受、５……本体ジヤツ
キ受、６……圧入用ジヤツキ、７……吊上げ用ジ
ヤツキ、８……ジヤツキの油圧ユニツト、９……
レベルセンサー。
FIG. 1 is a longitudinal sectional view showing the device of the present invention,
FIG. 2 is a cross-sectional view of the cutting edge portion. FIGS. 3 to 6 are longitudinal cross-sectional views showing the construction process. 1... Blade mouth part, 2... Main body part, 3... Guide plate, 4... Blade mouth jack holder, 5... Main body jack holder, 6... Press-fitting jack, 7... Lifting jack, 8... ...Jack's hydraulic unit, 9...
level sensor.
Claims (1)
体部分２とに刃口近傍の水平面により分離し、刃
口部分１には外周上面にジヤツキのストロークを
カバーする長さに突出したガイド板３と内周面に
突出する複数の刃口ジヤツキ受４を設け、本体部
分２の下面の前記刃口ジヤツキ受４に対応する位
置に本体ジヤツキ受５を設け、刃口ジヤツキ受４
と本体ジヤツキ受５に対して直列２連のセンター
ホール型ジヤツキを設けてなるオープンケーソ
ン。 ２ 沈設するオープンケーソンの躯体を刃口部分
と本体部分とに分離して構築し、刃口部分と本体
部分との間に複数の直列２連のセンターホール型
ジヤツキを設置し、躯体の本体部分の自重を反力
にしてセンターホール型ジヤツキの下方圧入用ジ
ヤツキ６の操作で刃口部分を圧入しながら掘削し
た底面土中に圧入すると共に、センターホール型
ジヤツキの上方吊上げ用ジヤツキ７を伸ばして刃
口部分を吊り上げ、本体部分の自重を刃口部分へ
掛けて、本体部分を沈設することを特徴とするオ
ープンケーソンの沈設工法。[Scope of Claims] 1. The open caisson to be sunk is separated into a cutting edge part 1 and a main body part 2 by a horizontal plane near the cutting edge, and the cutting edge part 1 has a protrusion on the upper surface of the outer periphery with a length that covers the stroke of the jack. A guide plate 3 and a plurality of blade jack holders 4 protruding from the inner peripheral surface are provided, and a main body jack holder 5 is provided at a position corresponding to the blade jack holder 4 on the lower surface of the main body portion 2.
An open caisson having two center hole type jacks connected in series to the jack receiver 5 of the main body. 2 The frame of the open caisson to be sunk is constructed by separating it into the cutting edge part and the main body part, and a plurality of two series center hole type jacks are installed between the cutting edge part and the main body part, and the main part of the frame is separated. Using its own weight as a reaction force, operate the downward press-fitting jack 6 of the center-hole type jack to press the cutting edge into the excavated bottom soil, and at the same time extend the upward lifting jack 7 of the center-hole type jack. A construction method for opening an open caisson, which is characterized by lifting the cutting edge, applying the weight of the main body to the cutting edge, and then lowering the main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25576185A JPS62117920A (en) | 1985-11-13 | 1985-11-13 | Open caisson and its settling work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25576185A JPS62117920A (en) | 1985-11-13 | 1985-11-13 | Open caisson and its settling work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62117920A JPS62117920A (en) | 1987-05-29 |
| JPH0438849B2 true JPH0438849B2 (en) | 1992-06-25 |
Family
ID=17283256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25576185A Granted JPS62117920A (en) | 1985-11-13 | 1985-11-13 | Open caisson and its settling work |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62117920A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01230813A (en) * | 1988-03-09 | 1989-09-14 | Sekisui House Ltd | Construction of underground structure |
| JPH0623453B2 (en) * | 1989-04-24 | 1994-03-30 | 東洋建設株式会社 | Open caisson propulsion method |
| KR100891980B1 (en) * | 2008-07-01 | 2009-04-08 | 이학곤 | Caisson structures for underground soil blocking and manufacturing method of anti-noise non-vibration caisson structures using thereof |
-
1985
- 1985-11-13 JP JP25576185A patent/JPS62117920A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62117920A (en) | 1987-05-29 |
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