JP2524654B2 - Kason deposition method - Google Patents
Kason deposition methodInfo
- Publication number
- JP2524654B2 JP2524654B2 JP2205187A JP20518790A JP2524654B2 JP 2524654 B2 JP2524654 B2 JP 2524654B2 JP 2205187 A JP2205187 A JP 2205187A JP 20518790 A JP20518790 A JP 20518790A JP 2524654 B2 JP2524654 B2 JP 2524654B2
- Authority
- JP
- Japan
- Prior art keywords
- caisson
- ground
- blade
- excavator
- groove
- 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
Description
【発明の詳細な説明】 《産業上の利用分野》 この発明は、例えば地下立体駐車場などを構築する際
などに利用されるケーソン沈設工法に関し、特に、ケー
ソンを沈設させるためにケーソンの下部の地盤を掘削す
る方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a caisson laying method used when constructing, for example, an underground multistory parking lot, and particularly to a caisson lower portion for laying a caisson. It relates to the improvement of the method of excavating the ground.
《従来の技術》 ケーソンは、ケーソン下端(刃口)の下の地盤を掘削
して刃口の先端抵抗を弱めることで、ケーソン躯体の自
重と載加重により沈下する。従来のケーソン沈設工法で
は、筒形ケーソンの内周部分の地盤を全て掘削して掘り
下げる総掘り方式を採用している。そのために用いるケ
ーソン掘削機はケーソンの大きさに合わせたロータリ式
の掘削機を用いており、ケーソンの中心部に上から吊下
げられるように掘削機が設置され、回転式のビットによ
りケーソン内部の土砂を掘削するとともに、掘削穴の底
部分で拡底ビットを働かせて穴の径を外側に拡げ、ケー
ソン刃口下の土砂をも掘削する。この刃口下まで拡げら
れた穴に沿ってケーソンを沈下させる。<< Conventional Technology >> A caisson is sunk by excavating the ground below the caisson lower end (blade mouth) to weaken the tip resistance of the caisson, and by the weight of the caisson body and loading. The conventional caisson digging method employs a total digging method in which the entire ground at the inner peripheral portion of the cylindrical caisson is excavated and dug. The caisson excavator used for that purpose uses a rotary excavator that matches the size of the caisson.The excavator is installed so that it can be hung from above in the center of the caisson, and the caisson internal Along with excavating the earth and sand, the bottom expansion bit is operated at the bottom of the excavation hole to expand the diameter of the hole to the outside, and the earth and sand under the caisson blade is also excavated. The caisson is sunk along the hole that extends under the blade.
《発明が解決しようとする課題》 従来のようにロータリ式の掘削機でケーソン内部の地
盤を総掘りする工法は円筒形ケーソンに適用されるわけ
だが、正方形や長方形の断面形状をもった角筒形のケー
ソンの場合はロータリ式掘削機でケーソン内部の地盤全
体を掘り進むことはできない。また、円筒形のケーソン
であっても、径の大きな大型のケーソンの場合は、内部
の地盤をロータリ式掘削機で全て掘削するには、極めて
大型の掘削機が必要となり、現実的には直径が5m以上の
ケーソンにはロータリ式掘削機で対応することができな
い。<Problems to be solved by the invention> Conventionally, the method of excavating the entire ground inside a caisson with a rotary excavator is applied to a cylindrical caisson, but a square tube with a square or rectangular cross section. In the case of shaped caisson, it is not possible to dig the entire ground inside the caisson with a rotary excavator. In addition, even with a cylindrical caisson, in the case of a large caisson with a large diameter, an extremely large excavator is required to excavate all the ground inside with a rotary excavator, and in reality A caisson with a length of 5m or more cannot be handled by a rotary excavator.
この発明は前述した従来の問題点に鑑みなされたもの
で、角筒形のケーソンや径の大きな大型のケーソンにも
容易に対応することができるケーソン沈設工法を提供す
ることにある。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a caisson digging method that can easily cope with a square tube-shaped caisson and a large caisson having a large diameter.
《課題を解決するための手段》 そこでこの発明では、筒形ケーソンの内周に沿って溝
状に地盤を掘削するとともに、その溝内部において外周
側に溝穴を拡幅することで、ケーソンの刃口下を掘削し
てケーソンを沈設するようにした。<< Means for Solving the Problem >> Therefore, in the present invention, by excavating the ground in a groove shape along the inner circumference of the cylindrical caisson, and widening the groove hole on the outer peripheral side inside the groove, the blade of the caisson I tried to dig the mouth and sunk the caisson.
《作 用》 筒内の断面積が大きくても、筒内の地盤を全て掘削す
るのではなく、ケーソンの内周に沿って溝状に地盤を掘
削するので、ケーソンの断面形状が角形であってもある
いは大型であっても掘削作業はあまり大規模なものには
ならない。<Operation> Even if the cross-sectional area in the cylinder is large, the ground is excavated along the inner circumference of the caisson instead of excavating the entire ground in the cylinder. Therefore, the caisson has a rectangular cross-sectional shape. Even if it is large or large, excavation work will not be very large.
《実施例》 第1図は本発明のケーソン沈設工法の実施例を示して
いる。この例では四角枠形のケーソン2を地盤1の所定
位置に設置し、そのケーソン2の内壁面に沿って地盤1
を溝状に掘削する。9は掘削された溝穴を示している。<< Embodiment >> FIG. 1 shows an embodiment of the caisson depositing method of the present invention. In this example, a square frame-shaped caisson 2 is installed at a predetermined position on the ground 1, and the ground 1 is placed along the inner wall surface of the caisson 2.
Excavate in a groove. Reference numeral 9 indicates a groove hole that has been excavated.
溝穴9の掘削には例えばケリー型掘削機3を用いる。
垂直な支持軸6の下端に掘削機3を取付け、ケーソン2
の内壁に沿って溝穴9を掘削する。For the excavation of the slot 9, for example, the Kerry type excavator 3 is used.
The excavator 3 is attached to the lower end of the vertical support shaft 6, and the caisson 2
The slot 9 is excavated along the inner wall of the.
またケリー型掘削機3の上部に拡幅用掘削刃4を備え
た拡幅駆動部5を付設している。掘削刃4は溝穴9を外
側へ拡幅するためのもので、駆動部5によって揺動駆動
され、掘削機3で形成された溝穴9の外側の面を掘削刃
4で掘り崩して穴の幅を外側へ拡げるようになってい
る。10は拡幅用掘削刃4で掘削された拡幅部分を示して
いる。Further, a widening drive unit 5 having a widening excavating blade 4 is attached to the upper portion of the Kelly type excavator 3. The digging blade 4 is for widening the groove hole 9 to the outside, and is oscillated by the drive unit 5 to dig the outer surface of the groove hole 9 formed by the excavator 3 with the digging blade 4 to remove the hole. It is designed to expand the width to the outside. Reference numeral 10 denotes a widening portion excavated by the widening excavating blade 4.
溝穴9はケーソン2の内壁面に沿って形成され、拡幅
部分10は溝穴9の外側に形成されているので、拡幅部分
10はケーソン2の刃口下に形成される。溝穴9をケーソ
ン2の内壁面に沿って一周するように形成した後、拡幅
部分10をケーソン2の刃口下に沿って一周するように形
成し、ケーソン2を地盤1中に沈設する。Since the slot 9 is formed along the inner wall surface of the caisson 2 and the widened portion 10 is formed outside the slot 9, the widened portion is formed.
10 is formed under the blade of the caisson 2. After forming the slot 9 so as to make a round along the inner wall surface of the caisson 2, the widened portion 10 is formed so as to make a round along the bottom of the blade of the caisson 2, and the caisson 2 is sunk in the ground 1.
ケーソン2の自重たけではスムーズにケーソン2を沈
下させることができない場合、地盤1の表面部分に設置
したフレーム7にジャッキ8を取付け、ケーソン2をジ
ャッキ8によって下方に押圧し、その押圧力とケーソン
2の自重でもってケーソン2を溝穴9および拡幅部分10
内に押し込むように沈下させる。If the caisson 2 cannot be smoothly submerged by the weight of the caisson 2, the jack 8 is attached to the frame 7 installed on the surface of the ground 1, and the caisson 2 is pressed downward by the jack 8 to reduce the pressing force and the caisson. With the weight of 2, the caisson 2 is inserted into the slot 9 and the widened portion 10
Let it sink as if you push it inside.
《発明の効果》 以上詳細に説明したように、この発明によるケーソン
沈設工法では、ケーソンの内部の地盤を全て掘り下げる
のではなく、ケーソンの内周に沿って溝状に掘削し、そ
の溝穴の内部において穴を拡幅してケーソン刃口下を掘
削するようにしたので、角筒形のケーソンでも円筒形の
ケーソンでも何ら問題なく実施することができ、また極
めて大型のケーソンであっても地盤の掘削作業は比較的
小規模であるので、小規模な掘削機を用いて能率よく必
要な地盤掘削作業を行うことができ、従ってケーソン沈
設を能率よく進めることができる。<< Effects of the Invention >> As described in detail above, in the caisson digging method according to the present invention, instead of excavating the entire ground inside the caisson, it excavates in a groove shape along the inner circumference of the caisson, and Since the hole is widened inside the caisson to excavate under the blade edge, it can be carried out with no problems with square cylindrical caisson or cylindrical caisson. Since the excavation work is relatively small, the required ground excavation work can be efficiently performed by using a small-scale excavator, and therefore caisson deposition can be efficiently performed.
第1図は本発明の一実施例によるケーソン沈設工法の概
略図である。 1……地盤、2……ケーソン 3……ケリー型掘削機、4……拡幅用掘削刃 5……拡幅駆動部、6……支持軸 7……フレーム、8……ジャッキ 9……溝穴、10……拡幅部分FIG. 1 is a schematic view of a caisson laying method according to an embodiment of the present invention. 1 ... Ground, 2 ... Caisson 3 ... Kelly type excavator, 4 ... Widening excavating blade, 5 ... Widening drive unit, 6 ... Support shaft, 7 ... Frame, 8 ... Jack, 9 ... Groove hole , 10 …… Widened part
Claims (1)
掘削するとともに、その溝穴内部において外周側に溝穴
を拡幅することでケーソンの刃口下を掘削してケーソン
を沈設することを特徴とするケーソン沈設工法。1. The excavation of the ground in the shape of a groove along the inner circumference of a tubular caisson, and the expansion of the groove on the outer peripheral side inside the groove excavates the bottom of the caisson blade to dig the caisson. Caisson construction method characterized by doing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2205187A JP2524654B2 (en) | 1990-08-03 | 1990-08-03 | Kason deposition method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2205187A JP2524654B2 (en) | 1990-08-03 | 1990-08-03 | Kason deposition method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0492019A JPH0492019A (en) | 1992-03-25 |
JP2524654B2 true JP2524654B2 (en) | 1996-08-14 |
Family
ID=16502852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2205187A Expired - Lifetime JP2524654B2 (en) | 1990-08-03 | 1990-08-03 | Kason deposition method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2524654B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105696614B (en) * | 2016-01-27 | 2018-02-02 | 中国十七冶集团有限公司 | One kind solves the super heavy resetting means of open caisson using top of above leaving behind |
-
1990
- 1990-08-03 JP JP2205187A patent/JP2524654B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0492019A (en) | 1992-03-25 |
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