JPH06158642A - Soft ground improvement method - Google Patents

Soft ground improvement method

Info

Publication number
JPH06158642A
JPH06158642A JP20245393A JP20245393A JPH06158642A JP H06158642 A JPH06158642 A JP H06158642A JP 20245393 A JP20245393 A JP 20245393A JP 20245393 A JP20245393 A JP 20245393A JP H06158642 A JPH06158642 A JP H06158642A
Authority
JP
Japan
Prior art keywords
ground
depth
amount
hardening material
strength
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
Application number
JP20245393A
Other languages
Japanese (ja)
Other versions
JPH0672416B2 (en
Inventor
Seiichi Nakamura
誠一 中村
Shigeo Manna
繁夫 万名
Shigeru Endo
茂 遠藤
Kazutoshi Endo
和敏 遠藤
Katsuyuki Washitsuka
勝幸 鷲塚
Satoshi Matsuzawa
諭 松沢
Masanori Matsushita
正憲 松下
Kazuma Misaka
一磨 三阪
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.)
Fudo Tetra Corp
Original Assignee
Fudo Construction Co Ltd
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 Fudo Construction Co Ltd filed Critical Fudo Construction Co Ltd
Priority to JP20245393A priority Critical patent/JPH0672416B2/en
Publication of JPH06158642A publication Critical patent/JPH06158642A/en
Publication of JPH0672416B2 publication Critical patent/JPH0672416B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

(57)【要約】 【目的】 地盤の深さ方向に強度が一定でない軟弱地盤
を地盤硬化材の攪拌混合により均一強度に改良すること
ができ、かつ、地盤硬化材の混入による地盤体積の増大
を防止することができる軟弱地盤改良工法の提供。 【構成】 各地盤深度Zで、その深度における地盤強度
Sに応じて変化させた量(Q)の地盤硬化材を投入し
て攪拌混合を行うとともに、その深度における地盤硬化
材の投入量Qに対応する量(Q)の地盤土壌の排除
を行う。 【効果】 目的の達成。
(57) [Summary] [Purpose] A soft ground whose strength is not constant in the depth direction of the ground can be improved to uniform strength by stirring and mixing the ground hardening material, and the ground volume is increased by mixing the ground hardening material. Provide a soft ground improvement method that can prevent [Structure] At each depth Z, the amount (Q 1 ) of the ground hardening material that is changed according to the ground strength S at that depth is charged and stirred and mixed. Exclusion of ground soil in an amount (Q 2 ) corresponding to 1 is performed. [Effect] Achieve the purpose.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明が属する技術分野】本発明は、地盤硬化材(セメ
ント、セメントミルク等)の攪拌混合により軟弱地盤を
硬化処理する軟弱地盤改良工法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft ground improvement method for hardening soft ground by stirring and mixing ground hardening materials (cement, cement milk, etc.).

【0002】[0002]

【発明の目的】地盤硬化材の攪拌混合により軟弱地盤を
硬化処理する場合の1つの問題点は、原地盤の性状によ
っては地盤土壌に対する体積比で数10%にも及ぶ大量
の地盤硬化材の混入により、地盤が盛上がったり、地盤
が側方に拡がって周辺の既設構造物に悪影響を与えたり
することである。
[Object of the Invention] One problem in hardening treatment of soft ground by stirring and mixing of ground hardening material is that, depending on the properties of the original ground, a large amount of ground hardening material can reach up to several 10% by volume ratio to ground soil. The mixture may cause the ground to rise or the ground to spread laterally and adversely affect existing surrounding structures.

【0003】本発明の目的は、地盤の深さ方向に強度が
一定でない軟弱地盤を地盤硬化材の攪拌混合により均一
強度に改良することができ、併せて、前記問題点を解消
することができる合理的な軟弱地盤改良工法を提供する
ことにある。
The object of the present invention is to improve the strength of a soft ground whose strength is not constant in the depth direction of the ground to a uniform strength by stirring and mixing the ground hardening material, and at the same time, to solve the above problems. It is to provide a reasonable soft ground improvement method.

【0004】[0004]

【発明の構成】本発明の構成上の特徴は、地盤硬化材の
攪拌混合により軟弱地盤を硬化処理する軟弱地盤改良工
法において、各地盤深度で、その深度における地盤強度
に応じて変化させた量の地盤硬化材を投入して攪拌混合
を行うとともに、その深度における地盤硬化材の投入量
に対応する量の地盤土壌の排除を行う点にある。
The composition of the present invention is characterized in that in a soft ground improvement method in which a soft ground is hardened by stirring and mixing the ground hardening material, the amount changed at each ground depth according to the ground strength at that depth. The point is that the ground hardening material is added and stirred and mixed, and at the same time, the amount of ground soil corresponding to the amount of the ground hardening material added is removed.

【0005】なお、本発明を実施するには、例えば、下
端部に攪拌翼を突設した回転軸の貫入時に、回転軸の下
端部に取り付けた適宜計器により地盤強度を連続的に検
知して、各地盤深度における地盤硬化材の投入量と地盤
土壌の排除量を決定しておき、回転軸の引き抜き時に、
各深度で、所定量の地盤土壌の排除と所定量の地盤硬化
材の攪拌混合を行えばよい。
In order to carry out the present invention, for example, when the rotary shaft having a stirring blade projecting from the lower end penetrates, the ground strength is continuously detected by an appropriate instrument attached to the lower end of the rotary shaft. The amount of ground hardening material input and the amount of ground soil removal at each depth are determined, and when the rotary shaft is pulled out,
At each depth, a predetermined amount of ground soil may be removed and a predetermined amount of ground hardening material may be stirred and mixed.

【0006】[0006]

【発明の具体的説明】図1において、Aは本発明によっ
て地盤改良を行う区域、Zは地盤深度、Sは地盤強度、
は地盤硬化材の投入量、Qは地盤土壌の排除量を
それぞれ示しており、本発明では、図1から明らかなよ
うに、地盤強度Sが小さい深度部分では大きい深度部分
よりも地盤硬化材の投入量Qを多くして、改良強度が
均一になるようにするとともに、各深度部分において地
盤硬化材の投入量Qに対応する量(Q)の原地盤土
壌の排除を行って、地盤硬化材の混入による地盤体積の
増加を防止する。
DETAILED DESCRIPTION OF THE INVENTION In FIG. 1, A is an area for ground improvement by the present invention, Z is ground depth, S is ground strength,
Q 1 represents the amount of ground hardening material input, and Q 2 represents the amount of ground soil removed. In the present invention, as is clear from FIG. The amount of hardened material input Q 1 is increased so that the improved strength becomes uniform, and the amount of soil (Q 2 ) corresponding to the amount of ground hardened material input Q 1 (Q 2 ) is eliminated at each depth. By doing so, the increase of the ground volume due to the mixing of the ground hardening material is prevented.

【0007】本発明実施用の装置としては、回転軸の下
端部に突設した攪拌翼で地盤土壌と地盤固化材の攪拌混
合を行う従来周知の地盤攪拌混合処理装置に図2に示す
ような排土装置を組み合わせたものが考えられる。
As a device for carrying out the present invention, a conventionally known ground agitation mixing treatment device for agitating and mixing the ground soil and the ground solidifying material is shown in FIG. 2 with agitation blades protruding from the lower end of the rotary shaft. A combination of soil removal devices is possible.

【0008】図2において、1は回転軸、2は回転軸1
の先端部外周に取り付けた排土用のスクリュー、3はパ
イプ、4はパイプ3の下端部に開口する空気送給管であ
り、図示の排土装置では、パイプ3内に図示のようにス
クリュー2がパイプ3の下端から所定長さ突出する状態
で挿設されている回転軸1を回転させて、スクリュー2
で地盤土壌をパイプ3内に取り込み、取り込んだ地盤土
壌は空気送給管4を通して送られる空気で付勢してパイ
プ3内を上昇させるようにしており、パイプ3内に取り
込む地盤土壌の量、すなわち、排土量は、回転軸1の回
転数を変えて変化させることができる。
In FIG. 2, 1 is a rotary shaft, 2 is a rotary shaft 1.
A screw for discharging earth attached to the outer periphery of the tip end of the pipe, 3 is a pipe, and 4 is an air feeding pipe opening to the lower end of the pipe 3. In the illustrated soil discharging device, the screw is installed in the pipe 3 as shown in the drawing. 2 rotates the rotary shaft 1 that is inserted in a state in which 2 projects from the lower end of the pipe 3 by a predetermined length,
The ground soil is taken into the pipe 3, and the taken-in ground soil is urged by the air sent through the air feeding pipe 4 to raise the inside of the pipe 3, and the amount of the ground soil taken into the pipe 3, That is, the amount of soil removed can be changed by changing the number of rotations of the rotary shaft 1.

【0009】攪拌翼付きの回転軸を並設した従来周知の
地盤攪拌混合処理装置に、その隣接の回転軸間の攪拌翼
より上方の位置にスクリュー2の先端があるようにし
て、図2に示す排土装置を組み合わせれば、回転軸の引
き抜き時に、攪拌混合処理に先行して連続的に各地盤深
度における地盤硬化材の投入量に対応する量の排土を行
うことができる。
In the conventional well-known ground stirring and mixing treatment apparatus in which rotating shafts with stirring blades are arranged in parallel, the tip of the screw 2 is located at a position above the stirring blades between the adjacent rotating shafts. By combining the shown soil discharging devices, it is possible to continuously discharge soil in an amount corresponding to the input amount of the ground hardening material at each depth of the ground before the stirring and mixing process when the rotary shaft is pulled out.

【0010】本発明を実施する場合は、当然に、攪拌混
合処理に先立って各地盤深度における地盤強度を検知す
ることが必要であるが、例えば、攪拌翼付きの回賑軸の
先端部に適宜の地盤強度検知器を取り付け、回転軸の地
中貫入時に、各地盤深度における地盤強度を連続的に検
知して、各深度における地盤硬化材の所要投入量と地盤
土壌の所要排土量を演算しておけばよい。
In the case of carrying out the present invention, naturally, it is necessary to detect the ground strength at each ground depth prior to the stirring and mixing process. For example, the tip end of the reciprocating shaft with stirring blades can be appropriately used. The ground strength detector is installed to continuously detect the ground strength at each depth when the rotary shaft penetrates into the ground, and calculate the required input amount of ground hardening material and the required soil discharge amount at each depth. Just keep it.

【0011】[0011]

【発明の効果】本発明の軟弱地盤改良工法は、以上のよ
うなものであるから、地盤の深さ方向に強度が一定でな
い軟弱地盤を地盤硬化材の攪拌混合により均一強度に改
良できるとともに、地盤硬化材の混入により地盤体積が
増加して生じる弊害を確実に防止することができる。
EFFECTS OF THE INVENTION The method for improving soft ground of the present invention is as described above. Therefore, the soft ground whose strength is not constant in the depth direction of the ground can be improved to uniform strength by stirring and mixing the ground hardening material. It is possible to reliably prevent the adverse effect that the ground volume increases due to the mixing of the ground hardening material.

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

【図1】本発明の基本的説明図である。FIG. 1 is a basic explanatory diagram of the present invention.

【図2】本発明実施用装置における排土装置の一例図で
ある。
FIG. 2 is an example of an earth discharging device in the device for carrying out the present invention.

【符号の説明】[Explanation of symbols]

A:区域、Z:地盤深度、S:地盤強度、Q:地盤硬
化材の投入量、Q:地盤土壌の排除量、1:回転軸、
2:スクリュー、3:パイプ、4:空気送給管。
A: area, Z: Ground depth, S: ground strength, Q 1: input amount of ground hardener, Q 2: elimination of the ground soil, 1: rotary shaft,
2: Screw, 3: Pipe, 4: Air supply pipe.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 鷲塚 勝幸 北海道札幌市南区澄川6条3丁目203番26 号(澄川団地6号棟808号室) (72)発明者 松沢 諭 茨城県猿島郡総和町大字駒羽根1419番地の 2 (72)発明者 松下 正憲 埼玉県浦和市原山2丁目33番8号 (72)発明者 三阪 一磨 茨城県稲敷郡阿見町大字若栗444−81 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyuki Washizuka No. 203-326, 6-3, Sumikawa, Minami-ku, Sapporo-shi, Hokkaido (Room 808, Sumikawa housing complex No. 6, Building 72) 2 at Komagane 1419 (72) Inventor Masanori Matsushita 2-333 Harayama, Urawa-shi, Saitama (72) Inventor Kazuma Misaka 444-81 Wakaguri, Ami-machi, Inashiki-gun, Ibaraki

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 地盤硬化材の攪拌混合により軟弱地盤を
硬化処理する軟弱地盤改良工法において、各地盤深度
で、その深度における地盤強度に応じて変化させた量の
地盤硬化材を投入して攪拌混合を行うとともに、その深
度における地盤硬化材の投入量に対応する量の地盤土壌
の排除を行うことを特徴とする軟弱地盤改良工法。
1. In a soft ground improvement method in which soft ground is hardened by stirring and mixing the ground hardener, at a depth of each ground, a quantity of the ground hardener changed according to the ground strength at that depth is charged and stirred. A soft ground improvement method characterized by performing mixing and removing the ground soil in an amount corresponding to the amount of ground hardening material input at that depth.
JP20245393A 1993-06-28 1993-06-28 Soft ground improvement method Expired - Fee Related JPH0672416B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20245393A JPH0672416B2 (en) 1993-06-28 1993-06-28 Soft ground improvement method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20245393A JPH0672416B2 (en) 1993-06-28 1993-06-28 Soft ground improvement method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP20734385A Division JPS6268917A (en) 1985-09-19 1985-09-19 Soft ground improvement method

Publications (2)

Publication Number Publication Date
JPH06158642A true JPH06158642A (en) 1994-06-07
JPH0672416B2 JPH0672416B2 (en) 1994-09-14

Family

ID=16457782

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20245393A Expired - Fee Related JPH0672416B2 (en) 1993-06-28 1993-06-28 Soft ground improvement method

Country Status (1)

Country Link
JP (1) JPH0672416B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08134885A (en) * 1994-11-08 1996-05-28 Shimizu Corp Improved ground and ground improvement method
JP2014109179A (en) * 2012-12-04 2014-06-12 Shimizu Corp Sand compaction pile construction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08134885A (en) * 1994-11-08 1996-05-28 Shimizu Corp Improved ground and ground improvement method
JP2014109179A (en) * 2012-12-04 2014-06-12 Shimizu Corp Sand compaction pile construction method

Also Published As

Publication number Publication date
JPH0672416B2 (en) 1994-09-14

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