JPH03140520A - Method and device for improving soft ground - Google Patents
Method and device for improving soft groundInfo
- Publication number
- JPH03140520A JPH03140520A JP27916889A JP27916889A JPH03140520A JP H03140520 A JPH03140520 A JP H03140520A JP 27916889 A JP27916889 A JP 27916889A JP 27916889 A JP27916889 A JP 27916889A JP H03140520 A JPH03140520 A JP H03140520A
- Authority
- JP
- Japan
- Prior art keywords
- screw plate
- outer cylinder
- inner tube
- mud
- outer tube
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 8
- 238000003756 stirring Methods 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005056 compaction Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 13
- 239000010802 sludge Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000012258 stirred mixture Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は軟弱地盤改良法及びその装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for improving soft ground and an apparatus therefor.
「従来の技術」
従来の軟弱地盤改良法では地下に推進した外聞の内部に
ソイルセメント柱を形成した後外筒を地上に引上げ、該
ソイルセメント柱によって地盤を改良するものであった
。しかし軟弱地盤でもヘドロ層の地盤改良に際しては硬
化剤とヘドロとの混合が不充分であり、かつソイルセメ
ント柱の締固めが充分でないため充分な強度が得られな
いという問題があった。``Prior Art'' In the conventional soft ground improvement method, a soil cement column is formed inside an outer tube that is pushed underground, and then the outer tube is pulled up to the ground, and the ground is improved using the soil cement column. However, when improving the sludge layer even on soft ground, there are problems in that the hardening agent and sludge are not sufficiently mixed and the soil cement pillars are not compacted sufficiently, making it impossible to obtain sufficient strength.
「発明が解決しようとする課題」
本発明はヘドロと硬化剤の混合が充分なブレバクドブレ
ス柱を形成す乙ことによって充分な強度を有する地中ピ
ラーを形成しヘドロ層の地盤改良に適した方法及び装置
を提供することを目的とする。``Problems to be Solved by the Invention'' The present invention provides a method and a method suitable for ground improvement of sludge layers by forming underground pillars with sufficient strength by forming brevaced brace pillars with sufficient mixing of sludge and hardening agent. The purpose is to provide equipment.
「課題を解決するための手段」
上記の目的を達成するため本発明は
下端に切削刃を設けた外筒と、下端部に硬化剤注出口及
びスクリュー板を設けた内管とを互に反対方向に回転さ
せかつ上記注出口から硬化剤を注出し、上記スクリュー
板上の泥及び硬化剤を攪拌混合しながら所定位置まで地
中に推進した後、外筒を上記所定位置に止めたまま推進
時とは反対方向に回転させ、その状態において内管を推
進時とは反対方向に回転させることにより上記スクリュ
ー板の下面に自重をかけながら該内管を該スクリュー板
の回動により上昇させ、上記下面下の上記性・硬化剤混
合物を外筒内に加圧して締固め、その後外筒を地上に上
昇させることを特徴とする軟弱地盤改良法
下端に切削刃を設けた正逆回転自在の外筒と、下端部に
硬化剤注出口及びスクリュー板を設けた正逆回転自在の
内管とをそれぞれ直立案内ガイドに摺動自在に支持して
なり、外筒と内管との回転方向が互に反対方向である掘
削装置において、上記スクリュー板の上方内管に複数の
撹拌羽根を突設し、かつ外筒内面に複数の起伏撹拌羽根
の基部をピンで枢着してなり、該起伏攪拌羽根が外筒の
正転による推進時にピンを中心として泥の抵抗によって
内管に向う方向に起立し外筒の逆転時には泥の抵抗によ
って外筒の内面側に上記ピンを中心として倒伏するよう
形成し、上記スクリュー板の螺旋方向が内管の推進時に
地中に進入する方向に形成されてなる軟弱地盤改良装置
によって構成する。"Means for Solving the Problems" In order to achieve the above object, the present invention has an outer tube provided with a cutting blade at the lower end, and an inner tube provided with a hardening agent spout and a screw plate at the lower end, which are opposite to each other. direction, pour out the hardening agent from the spout, and propel it into the ground to a predetermined position while stirring and mixing the mud and hardening agent on the screw plate, and then propel it while keeping the outer cylinder at the predetermined position. In this state, by rotating the inner tube in the opposite direction to the direction of propulsion, the inner tube is raised by the rotation of the screw plate while applying its own weight to the lower surface of the screw plate, A soft ground improvement method characterized by pressurizing the above-mentioned hardening agent mixture under the lower surface into an outer cylinder to compact it, and then raising the outer cylinder above the ground. The outer tube and the inner tube, which is rotatable in forward and reverse directions and has a hardening agent outlet and a screw plate at its lower end, are each slidably supported by a straight inner guide, so that the direction of rotation of the outer tube and the inner tube is fixed. In the excavation equipment in which the directions are opposite to each other, a plurality of stirring blades are provided protruding from the upper inner tube of the screw plate, and the bases of the plurality of undulating stirring blades are pivotally attached to the inner surface of the outer cylinder with pins, and the undulating When the stirring blade is propelled by normal rotation of the outer cylinder, it stands up in the direction toward the inner pipe due to the resistance of the mud around the pin, and when the outer cylinder rotates in reverse, it collapses on the inner side of the outer cylinder around the pin due to the resistance of the mud. A soft ground improvement device is constructed in which the spiral direction of the screw plate is formed in a direction in which the inner pipe penetrates into the ground when the inner pipe is propelled.
「作用」
従って外筒２及び内管５を互に反対方向（矢印ａ、ｂ）
に同時に回転させて地中に推進させると外筒２と内管５
のスピンが相殺されて横振れすることな（スクリュー板
４の回転によって真直に下方に推進され、泥及び注出剤
は該スクリュー板４上において攪拌羽根７．７及び横向
に起立した攪拌羽根８．８の相互反対回動により著しく
攪拌混合される。外筒２及び内管５の下端が所定水準位
置に到達すると、推進及び硬化剤注出を停止し、外筒２
はその水準位置で矢印ａと反対方向（矢印ｄ）に回転さ
せ、その状態で内管５を矢印すと反対方向（矢印ｂ′）
に回転させると、スクリュー板４は螺旋の方向に上昇し
該内管５を持上げて上昇させるため内管５の自重によっ
てスクリュー板４の下面で外筒２内の攪拌混合物を加圧
し外筒２内に締固めながら上昇する。このようにして内
管５が地上に上昇した後（第４図）外筒２をクレーンで
引上げると外筒２内の締固められたブレバクドブレス柱
１０が地中に残留し、このブレバクドブレス柱１０によ
って地盤が改良される。推進中に現われる転石１１は外
筒２の切削刃ｌによって切削され切削孔が形成される。"Operation" Therefore, the outer tube 2 and the inner tube 5 are moved in opposite directions (arrows a, b).
When the outer tube 2 and the inner tube 5 are simultaneously rotated and propelled into the ground,
(The rotation of the screw plate 4 propels the mud and pouring agent straight downwards, and the mud and the pouring agent are moved by the stirring blades 7.7 and the stirring blades 8 that stand up laterally on the screw plate 4.) .8 are stirred and mixed considerably. When the lower ends of the outer tube 2 and the inner tube 5 reach a predetermined level position, the propulsion and curing agent pouring are stopped, and the outer tube 2
is rotated in the direction opposite to arrow a (arrow d) at that level position, and in this state, when the inner tube 5 is rotated in the opposite direction (arrow b')
When the screw plate 4 is rotated, the screw plate 4 rises in a spiral direction, and in order to lift the inner tube 5, the under surface of the screw plate 4 pressurizes the stirred mixture in the outer cylinder 2 by the weight of the inner tube 5, and the outer cylinder 2 It rises while compacting inside. After the inner tube 5 has risen above the ground in this way (FIG. 4), the outer tube 2 is pulled up by a crane, and the compacted brevac de brace column 10 inside the outer tube 2 remains underground. The ground will be improved. A boulder 11 that appears during propulsion is cut by the cutting blade l of the outer cylinder 2 to form a cut hole.
「実施例」
大径外筒２の下端に転石１１を切削する切削刃１を設け
、これを機台に設けた直立案内ガイド６に沿って昇降す
るフィーダー１２に正逆回転自在に支持する。又この外
筒２の中心部に配置した内管５の下端部にはセメントミ
ルクなどの硬化剤注出口３及びスクリュー板４を設け、
これを上記ガイド６に沿って昇降可能なフィーダー１２
′に正逆回転自在に支持し、駆動用減速モーター１３，
１３′によって外筒２と内管５を互に反対方向に回転さ
せるように形成して地盤掘削装置を構成する。"Embodiment" A cutting blade 1 for cutting boulders 11 is provided at the lower end of a large-diameter outer cylinder 2, and this is supported by a feeder 12 that moves up and down along a straight inner guide 6 provided on a machine base so as to be rotatable forward and backward. Further, a hardening agent spout 3 such as cement milk and a screw plate 4 are provided at the lower end of the inner tube 5 placed in the center of the outer tube 2.
A feeder 12 that can be raised and lowered along the guide 6
' is supported for forward and reverse rotation, and a drive reduction motor 13,
13', the outer tube 2 and the inner tube 5 are formed to rotate in opposite directions to constitute a ground excavation device.
上記フィーダー１２．１２′の昇降はそれぞれ滑車１４
．１４′に掛回されたワイヤローブ１５．１５′の巻取
及び巻戻しによって該フィーダー１２．１２′及び外筒
２及び内管５を昇降させることができる。この内管２に
はスクリュー板４の上方に複数の撹拌羽根７．７を横向
に突設し、スクリュー板４と該羽根７との中間及び該羽
根７．７の中間に複数の横向起伏撹拌羽根８．８を配置
し、該羽根８．８の基部を直角に屈曲して屈曲部８′を
外筒２の内面にピン９によって水平方向に回動自在に枢
着し、第２図矢印ａ方向の回動に際しては泥の抵抗によ
って内管５に向って起立して撹拌作用を行い、矢印ａ′
方向の回動に際しては同第２図仮想線で示す位置に泥の
抵抗によってスクリュー板４の外側に倒伏し、倒伏状態
ではスクリュー板４の昇降が可能になるものである。も
ちろんスクリュー板４の螺旋の方向は内管５の下降推進
時に地中に進入する方向である。尚図中１６で示すもの
はスクリュー板４の先端切削刃、１７．１７’はフィー
ダー１２．１２′の案内シュー １８は地面である。The feeders 12 and 12' are raised and lowered by pulleys 14, respectively.
．． The feeder 12.12', the outer tube 2, and the inner tube 5 can be raised and lowered by winding and unwinding the wire lobes 15.15' wound around the wire lobes 14'. A plurality of stirring blades 7.7 are provided in the inner tube 2 to project laterally above the screw plate 4, and a plurality of horizontally undulating stirring blades are provided between the screw plate 4 and the blades 7 and between the blades 7.7. A blade 8.8 is arranged, the base of the blade 8.8 is bent at a right angle, and the bent part 8' is pivoted to the inner surface of the outer cylinder 2 by a pin 9 so as to be rotatable in the horizontal direction, as shown by the arrow in FIG. When rotating in the direction a, it stands up toward the inner tube 5 due to the resistance of the mud and performs a stirring action, and as shown by the arrow a'
When rotating in the direction shown in FIG. 2, the screw plate 4 is brought down to the outside due to the resistance of the mud to the position shown by the imaginary line in FIG. Of course, the spiral direction of the screw plate 4 is the direction in which the inner pipe 5 enters the ground when it is propelled downward. In the figure, 16 indicates the cutting edge at the tip of the screw plate 4, 17.17' indicates the guide shoe of the feeder 12.12', and 18 indicates the ground.
「発明の効果」
本発明は上述の方法ｊ及び装置によったのでヘドロ層の
ような軟弱地盤内に泥と硬化剤との充分混合した、しか
も充分締固められた比較的強慶大な柱状体を形成し得て
きわめて軟弱な地盤の改良に適用し得る効果がある。"Effects of the Invention" Since the present invention is based on the above-mentioned method and apparatus, mud and hardening agent are sufficiently mixed in soft ground such as a sludge layer, and a comparatively strong columnar shape that is sufficiently compacted is formed. It has an effect that can be applied to the improvement of extremely soft ground that can form a body.
第１図は本発明の軟弱地盤改良装置を示す縦断面図、第
２図は第１図Ａ−Ａ線による平面図、第３図は該装置の
全体正面図、第４図は外筒引抜前の状態の縦断面図であ
る。
１・・切削刃、２・・外筒、３・・硬化剤注出口、４・
・スクリュー板、５・・内管、６・・直立案内ガイド、
７・・撹拌羽根、８・・起伏攪拌羽根、９・・ピン。Fig. 1 is a longitudinal sectional view showing the soft ground improvement device of the present invention, Fig. 2 is a plan view taken along the line A-A in Fig. 1, Fig. 3 is an overall front view of the device, and Fig. 4 is an outer cylinder pulled out. It is a longitudinal cross-sectional view of the previous state. 1. Cutting blade, 2. Outer cylinder, 3. Hardening agent spout, 4.
・Screw plate, 5. Inner pipe, 6. Direct inner guide,
7. Stirring blade, 8. Undulating stirring blade, 9. Pin.
Claims (2)
出口及びスクリュー板を設けた内管とを互に反対方向に
回転させかつ上記注出口から硬化剤を注出し、上記スク
リュー板上の泥及び硬化剤を撹拌混合しながら所定位置
まで地中に推進した後、外筒を上記所定位置に止めたま
ま推進時とは反対方向に回転させ、その状態において内
管を推進時とは反対方向に回転させることにより上記ス
クリュー板の下面に自重をかけながら該内管を該スクリ
ュー板の回動により上昇させ、上記下面下の上記泥・硬
化剤混合物を外筒内に加圧して締固め、その後外筒を地
上に上昇させることを特徴とする軟弱地盤改良法。(1) Rotate an outer tube with a cutting blade at the lower end and an inner tube with a hardening agent spout and screw plate at the lower end in opposite directions, pour out the hardening agent from the spout, and then After stirring and mixing the mud and hardening agent on the screw plate and propelling it into the ground to a predetermined position, the outer tube is rotated in the opposite direction to that during propulsion while remaining at the predetermined position, and the inner tube is propelled in this state. By rotating the screw plate in the opposite direction, the inner tube is raised by the rotation of the screw plate while applying its own weight to the lower surface of the screw plate, and the mud/hardening agent mixture below the lower surface is added to the outer tube. A soft ground improvement method characterized by compressing and compacting, and then raising the outer cylinder above the ground.
端部に硬化剤注出口及びスクリュー板を設けた正逆回転
自在の内管とをそれぞれ直立案内ガイドに摺動自在に支
持してなり、外筒と内管との回転方向が互に反対方向で
ある掘削装置において、上記スクリュー板の上方内管に
複数の攪拌羽根を突設し、かつ外筒内面に複数の起伏撹
拌羽根の基部をピンで枢着してなり、該起伏撹拌羽根が
外筒の正転による推進時にピンを中心として泥の抵抗に
よって内管に向う方向に起立し外筒の逆転時には泥の抵
抗によって外筒の内面側に上記ピンを中心として倒伏す
るよう形成し、上記スクリュー板の螺旋方向が内管の推
進時に地中に進入する方向に形成されてなる軟弱地盤改
良装置。(2) An outer tube with a cutting blade at the lower end that can be rotated in forward and reverse directions, and an inner tube with a hardening agent spout and screw plate at the lower end that can be rotated in forward and backward directions can be slid freely on the direct inner guide. In an excavation device in which the outer tube and the inner tube rotate in opposite directions, a plurality of stirring blades are provided protruding from the inner tube above the screw plate, and a plurality of undulations are provided on the inner surface of the outer tube. The base of the stirring blade is pivotally connected by a pin, and when the outer cylinder is propelled by forward rotation, the undulating stirring blade stands up in the direction toward the inner pipe due to the resistance of the mud around the pin, and when the outer cylinder is reversed, the resistance of the mud is increased. The soft ground improving device is formed such that the screw plate is formed to lie down on the inner surface side of the outer tube around the pin, and the spiral direction of the screw plate is formed in a direction in which the screw plate penetrates into the ground when the inner tube is propelled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1279168A JPH079097B2 (en) | 1989-10-25 | 1989-10-25 | Soft ground improvement method and its equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1279168A JPH079097B2 (en) | 1989-10-25 | 1989-10-25 | Soft ground improvement method and its equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03140520A true JPH03140520A (en) | 1991-06-14 |
| JPH079097B2 JPH079097B2 (en) | 1995-02-01 |
Family
ID=17607401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1279168A Expired - Lifetime JPH079097B2 (en) | 1989-10-25 | 1989-10-25 | Soft ground improvement method and its equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079097B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011137358A (en) * | 2010-07-06 | 2011-07-14 | Tosho:Kk | Device and method for constructing ground improving body |
| JP2021011679A (en) * | 2019-07-03 | 2021-02-04 | 株式会社フジタ | Agitation device and ground improvement method of pile burying hole |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5796123A (en) * | 1980-12-08 | 1982-06-15 | Aijietsuku Kk | Soil stirring shaft with casing and stabilization work for soft ground |
| JPS6030712A (en) * | 1983-07-28 | 1985-02-16 | Enoki Toshio | Improvement work of soft ground |
| JPS6145016A (en) * | 1984-08-06 | 1986-03-04 | Shiro Yamaguchi | Ground improver |
| JPS6351515A (en) * | 1986-08-20 | 1988-03-04 | Mitani Sekisan Kk | Excavator for ground improvement |
-
1989
- 1989-10-25 JP JP1279168A patent/JPH079097B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5796123A (en) * | 1980-12-08 | 1982-06-15 | Aijietsuku Kk | Soil stirring shaft with casing and stabilization work for soft ground |
| JPS6030712A (en) * | 1983-07-28 | 1985-02-16 | Enoki Toshio | Improvement work of soft ground |
| JPS6145016A (en) * | 1984-08-06 | 1986-03-04 | Shiro Yamaguchi | Ground improver |
| JPS6351515A (en) * | 1986-08-20 | 1988-03-04 | Mitani Sekisan Kk | Excavator for ground improvement |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011137358A (en) * | 2010-07-06 | 2011-07-14 | Tosho:Kk | Device and method for constructing ground improving body |
| JP2021011679A (en) * | 2019-07-03 | 2021-02-04 | 株式会社フジタ | Agitation device and ground improvement method of pile burying hole |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH079097B2 (en) | 1995-02-01 |
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