JPS611717A - Ground improvement work by chemical stress - Google Patents
Ground improvement work by chemical stressInfo
- Publication number
- JPS611717A JPS611717A JP12050284A JP12050284A JPS611717A JP S611717 A JPS611717 A JP S611717A JP 12050284 A JP12050284 A JP 12050284A JP 12050284 A JP12050284 A JP 12050284A JP S611717 A JPS611717 A JP S611717A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- hardened
- construction method
- expansible
- hardening
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- 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、地盤を掘削、削孔または削孔撹拌して、所定
の配置で壁状または柱状の地中部材を形成し、この地中
部材で所要範囲の地盤耐力を補強強化しながら、同時に
、地盤自体を改良する工法に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention involves excavating, drilling, or drilling and agitating the ground to form wall-shaped or column-shaped underground members in a predetermined arrangement. It relates to a construction method that uses members to reinforce and strengthen the bearing capacity of the ground within a required range, while at the same time improving the ground itself.
近年、各種の軟弱地盤改良工法が開発され、種種の手段
で地盤改良が実施されており、一方、軟弱地盤上に構造
物を建設しようとする場合、軟弱地盤を貫通して支持層
に達する柱状または壁状の基礎構造部材を形成し、支持
層に直接的に構造物よりの諸外力を伝達支持させる方法
も種々実施されている。In recent years, various soft ground improvement methods have been developed and ground improvement is carried out using various methods. Alternatively, various methods have been implemented in which a wall-like foundation structural member is formed and external forces from the structure are directly transmitted and supported to the support layer.
各種の軟弱地盤改良工法は、原理的には、所要な改良範
囲地盤に、プレロード・振動・衝撃力・加圧力・爆発力
等の締め固め外力を作用させて土の間隙比を低下させ、
また、改良範囲の土の含水比を低減するため土粒子間々
隙水の排出を促進すること、の２つの対策を、それぞれ
単独または直行的に実施するものである。また、支持層
に達する基礎構造地中部材の形成方法としては、地上か
ら支持層まで柱状または壁状の部材を伺等かの方法で打
設するか、或いは掘削、削孔または削孔撹拌して、１位
置で柱状または壁状部材を塑造するかのいずれかの方法
が用いられている。In principle, various soft ground improvement methods apply compaction external forces such as preload, vibration, impact force, pressing force, and explosive force to the ground within the required improvement area to reduce the soil pore ratio.
Furthermore, in order to reduce the water content ratio of the soil in the improved area, two measures are taken independently or directly: promoting the discharge of pore water between soil particles. In addition, methods for forming underground members of the basic structure that reach the support layer include placing column-shaped or wall-shaped members from the ground to the support layer using methods such as digging, or by excavating, drilling, or drilling and stirring. Therefore, either a method of molding a columnar or wall-like member in one position is used.
これらのいずれの方法の場合も、その施工目的は単一で
あって、地盤を改良するか、或いは地中に部材を形成す
るかの、いずれか一つに限定されている。In any of these methods, the purpose of construction is single and limited to either improving the ground or forming a member underground.
近年、海水砂層の地震時液状化に伴う災害発生等に鑑み
、各種示方書・基準等において、地震時液状化の懸念が
ある土層に関しては、基礎構造設計上の地盤土質諸定数
の低減配慮が義務付けられ、このため、滞水砂層を貫通
した基盤に達する地中部材を用いる基礎構造においても
、地中部杓の曲げ剛性の大幅な強化を必要とし、著しい
工費の増大を招いている。In recent years, in view of the occurrence of disasters due to liquefaction of seawater sand layers during earthquakes, various specifications and standards require consideration to reduce various soil constants in foundation structure design for soil layers that are concerned about liquefaction during earthquakes. Therefore, even in foundation structures that use underground members that penetrate the water-retaining sand layer and reach the foundation, it is necessary to significantly strengthen the bending rigidity of the underground ladle, resulting in a significant increase in construction costs.
一方、地震時液状化の懸念がない軟弱粘性土地盤におい
ても、圧密沈下終了までの所要期間が長期にわたり、基
盤に達する地中部材で支持された基礎構造とした場合、
基礎下および周辺地盤の沈下に伴う基礎上構造物底面と
地盤の段差発生によって、種々の解決困難な問題が惹起
されている。On the other hand, even in soft and viscous soil where there is no risk of liquefaction during an earthquake, it takes a long time to complete consolidation subsidence, and if the foundation structure is supported by underground members that reach the foundation,
The occurrence of a level difference between the bottom of a structure on a foundation and the ground due to subsidence of the ground beneath and around the foundation has caused various problems that are difficult to solve.
従って、Ｃうした諸問題を解消するためには、基礎施工
前に、あらかじめ何等かの方法で地盤改良を実施し、地
震時液状化や長期にわたる沈下・の懸念がない水準まで
、別途に地盤改良対策を実施することが必要とされてお
り、基礎構造地中部材形成と地盤改良を同時に実現する
施工方法は確立されていない。Therefore, in order to solve these problems, it is necessary to improve the ground by some method before constructing the foundation, and separately improve the ground to a level where there is no concern about liquefaction during an earthquake or long-term subsidence. It is necessary to implement improvement measures, and a construction method that simultaneously realizes the formation of underground members of the foundation structure and soil improvement has not been established.
こうした問題点は、斜面・盛土等の安定確保対策工等に
おいても同様で、土層のせん断抵抗補強強化のため、柱
状部材等を想定滑り面に直交、または斜交させる形で設
置形成し、部材のせん断抵抗で土層のせん断抵抗を補強
し、一方で、土粒子間間隙内に結合硬化剤を注入し、或
いは水抜ポーリング孔を施工して、土層のせん断抵抗そ
のものを強化する方法が併用されるが、この両件用効果
を同時に単一の工法で満足させる施工方法は確立さ゛れ
ていない。These problems are the same in construction work to ensure the stability of slopes, embankments, etc. In order to strengthen the shear resistance of the soil layer, columnar members, etc. are installed orthogonal to or oblique to the assumed slip surface. There is a method of reinforcing the shear resistance of the soil layer using the shear resistance of the members, and on the other hand, reinforcing the shear resistance of the soil layer itself by injecting a binding hardening agent into the gaps between soil particles or constructing drainage poling holes. Although they are used in combination, a construction method that satisfies both effects simultaneously with a single construction method has not been established.
本発明工法は、こうした詫問題点を、地中部材施工の過
程で、単に地中部材形成に用いる結合硬化材料を膨張性
能を有する材料とする方法により、簡易にしかも経済的
に解消し、単一の工法で上述の両効果を同時に満足させ
る理想的な地盤改良工法を供せんとするものである。The construction method of the present invention solves these problems easily and economically by simply changing the bonding hardening material used to form the underground member to a material with expansion performance during the process of constructing the underground member. The aim is to provide an ideal ground improvement method that simultaneously satisfies both of the above-mentioned effects with a single method.
本発明工法の要□旨は、改良の必要がある範囲の地盤地
中に形成・□配置する連続または断続□的壁状または柱
状部材を、膨張性能を有する結合硬化材料で所要範囲の
土中に形成し、その多軸方向または所望方向の１会力に
よって、地中部材施工過程で自動的に地盤を圧縮・圧密
改良することにある〔発明工法の作用〕
本発明工法を実施した場合、配置した各地中部材の膨張
力は、さきに８頁７〜８行に記述した軟弱地盤改良工法
における締固め外力同様の作用効果を発揮し、結合硬化
材料として、周辺地盤から土中間隙水を吸収して膨張す
る材料を用いれば、軟弱地盤改良工法における土粒子間
々隙水の排出促進の作用効果を発揮し、また、形成され
る硬化体に補強材の拘束によって所望のプレストレスを
導入して部材耐力を向上させることも可能で、Ｃうして
形成された地中部材は地盤のせん断強度を補強すると共
”に、地中部材上構造物荷重等を直接支持地盤へ伝達す
る役割を果すものとなる。The gist of the construction method of the present invention is to form and place continuous or intermittent wall-like or columnar members in the ground within the required area using a bonded and hardened material that has expansion properties. [Effects of the invention method] When the invention method is implemented, The expansion force of the placed middle members exerts the same effect as the compaction external force in the soft ground improvement method described in lines 7 to 8 on page 8, and as a bonding hardening material, it removes pore water from the surrounding ground. If a material that absorbs and expands is used, it will be effective in promoting the drainage of pore water between soil particles in the soft ground improvement method, and it will also be possible to introduce the desired prestress into the formed hardened body by constraining the reinforcing material. It is also possible to improve the strength of the member, and the underground member formed in this way not only reinforces the shear strength of the ground, but also plays the role of directly transmitting the load of the structure on the underground member to the supporting ground. Become something.
〔発明工法実施例〕
以下に、本発明工法の２つの実施例（第１図および第２
図参照）を示し、具体的に施工方法を説明する。[Examples of the invention method] Below are two examples of the invention method (Fig. 1 and 2).
(see figure) and specifically explain the construction method.
実施例１． （第１因による）
地表面（１）から、硬化膨張性グラウト（２）を掘削壁
面安定液として注入しながら、支持層（３）まで連続壁
状に掘削し、グラウト硬化開始前にこの中に数段の突起
を設けたプレキャスト部材（４）を所要数設置して、所
要範囲をとり囲む形で地中に壁体を形成する。次いで地
表面（１）から支持Ｊｉｍ（３）まで削孔し、この中に
膨張性コンクリート（５）を注入し、仁のコンクリート
の硬化前に、数段の鍔部を設けた補強鋼材（６）を挿入
設置し、所要数の柱状体を形成する。さらに、地表面（
１）から地盤を削孔撹拌しながら、吸水膨張性結合硬化
材料を現位置砂質土と混合し、支持層に達する膨張性フ
ィルセメント柱状体（７）を断続的に形成する。こうし
て、各地中部材の硬化過程における膨張力および吸水性
によって、所要範囲の地盤を締固め改良して基礎構造を
形成する。Example 1. (Due to the first cause) Excavation is carried out in a continuous wall form from the ground surface (1) to the support layer (3) while injecting the hardened expandable grout (2) as an excavation wall stabilizing liquid, and before the grout begins to harden, excavate in the form of a continuous wall. A required number of precast members (4) each having several stages of protrusions are installed to form a wall in the ground surrounding the required area. Next, a hole is drilled from the ground surface (1) to the support Jim (3), and expandable concrete (5) is poured into it. Before the solid concrete hardens, a reinforcing steel material (6 ) to form the required number of columns. Furthermore, the ground surface (
While drilling and stirring the ground from step 1), the water-absorbing and expanding bonded hardening material is mixed with the existing sandy soil to intermittently form expandable fill cement columns (7) that reach the support layer. In this way, the foundation structure is formed by compacting and improving the ground in the required range by the expansion force and water absorption during the hardening process of each sub-base member.
実施例２（第２因による）
地表面＜１）から、想定滑り面（２）に自交または斜交
する方向に、￥’！（３）に若干貴人する削孔を行い、
この孔内に膨張性モルタル（４）または吸水性膨張結合
硬化材料（５）を注入しながら数段の局部を設けた補強
鋼材（６）を挿入設置し、想定滑り面を横切口基盤に貫
入した柱状部材を形成する。このモルタルまたは結合材
の膨張および吸水性によって斜面内土層のせん断抵抗を
向上させ、また、形成された柱状体には所望のケミカル
プレストレスを導入し、斜面のせん断耐力を補強させる
。Example 2 (based on the second factor) From the ground surface <1) in a direction orthogonal or oblique to the assumed slip surface (2), ¥'! (3) Drill a slightly deeper hole,
While injecting expandable mortar (4) or water-absorbing expandable bond hardening material (5) into this hole, reinforcing steel (6) with several stages of local parts is inserted and installed, and the assumed sliding surface penetrates the cross-exit base. form a columnar member. The expansion and water absorption of this mortar or binder improves the shear resistance of the soil layer within the slope, and also introduces a desired chemical prestress into the formed columnar bodies, reinforcing the shear strength of the slope.
尚、丙実施例は、さきに特許を得た６特公昭５８−１４
８９７”および“特公昭５８−４５５２７”等の発明技
術とも関連するものである。In addition, the C embodiment is based on the 6th Patent Publication of 1986-14, which was previously patented.
897'' and ``Japanese Patent Publication No. 58-45527''.
本発明実施例１．においては、第１図に示した本発明工
法実施前の祢準貫入試験Ｎ値が、本発明実施後２週間で
、地震時液状化の懸念がない水準（Ｎ≧１８〜２８）ま
で向上した。Example 1 of the present invention. In , the N value of the N-level penetration test shown in Figure 1 before implementation of the construction method of the present invention improved to a level (N≧18-28) where there was no concern of liquefaction during an earthquake two weeks after implementation of the present invention. .
本発明実施例２．においては、第２図の（７）に示した
地表面載荷を行っても、斜面が安定を保つ水準まで、斜
面のせん断耐力が向上した。Example 2 of the present invention. In this case, the shear strength of the slope was improved to a level where the slope remained stable even with the surface loading shown in (7) in Figure 2.
第１図は本発明実施例１．の平面図、鉛直断面図および
土質柱状図であり、第２図は本発明実施例λの平面内お
よび断面説明図である。FIG. 1 shows Example 1 of the present invention. FIG. 2 is a plan view, a vertical cross-sectional view, and a soil columnar diagram, and FIG. 2 is an in-plane and cross-sectional explanatory view of Example λ of the present invention.
Claims (1)
または柱状の硬化体を連続的または不連続的に形成・配
置して、地盤の耐力を強化する工法において、硬化体を
所望量の膨張性を有する結合硬化材料を用いて形成し、
各硬化体の硬化膨張力によつて、それぞれ所要範囲所要
深さの硬化体周辺地盤を多軸方向に所要な程度加圧し、
静的に地盤を圧縮・圧密改良する工法。 ２）地盤を掘削、削孔または削孔撹拌して、地中に壁状
または柱状の硬化体を連続的または不連続的に形成・配
置して、地盤の耐力を強化する工法において、硬化体を
所望量の膨張性を有する結合硬化材料を用いて形成し、
膨張性結合硬化材料の硬化開始前に、数段の鍔部または
突起を有するプレキャスト部材または補強材を膨張性結
合硬化材料中に挿入設置し、１軸または２軸方向への膨
張を拘束または規制して、これらの方向への膨張力を所
望の方向に変換して効率的に発揮させ、各硬化体のこの
硬化膨張力によつて、それぞれ所要範囲所要深さの硬化
体周辺地盤を所望の方向に所要な程度加圧し、静的に地
盤を圧縮・圧密改良する工法。[Claims] 1) Strengthen the bearing capacity of the ground by excavating, drilling or stirring the ground to form and arrange wall-shaped or column-shaped hardened bodies continuously or discontinuously in the ground. In this construction method, a cured body is formed using a bonded hardened material having a desired amount of expandability,
By the hardening expansion force of each hardened body, the ground around the hardened body in the required range and depth is pressurized to the required extent in multiple axial directions,
A construction method that statically compresses and improves consolidation of the ground. 2) In a construction method that strengthens the bearing capacity of the ground by forming and arranging wall-shaped or column-shaped hardened bodies in the ground in a continuous or discontinuous manner by excavating, drilling or stirring the ground, hardened bodies using a bonded hardened material having a desired amount of expansibility;
Before the expansible bonded hardening material begins to harden, a precast member or reinforcing material having several stages of flanges or protrusions is inserted into the expandable bonded hardening material to restrain or restrict expansion in one or two axial directions. Then, the expansion force in these directions is converted into the desired direction and efficiently exerted, and by this hardening expansion force of each hardened body, the ground around the hardened body in the required range and depth is transformed into the desired direction. A construction method that statically compresses and consolidates the ground by applying pressure to the required degree in the direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12050284A JPS611717A (en) | 1984-06-11 | 1984-06-11 | Ground improvement work by chemical stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12050284A JPS611717A (en) | 1984-06-11 | 1984-06-11 | Ground improvement work by chemical stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS611717A true JPS611717A (en) | 1986-01-07 |
Family
ID=14787782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12050284A Pending JPS611717A (en) | 1984-06-11 | 1984-06-11 | Ground improvement work by chemical stress |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS611717A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360271A (en) * | 1991-12-18 | 1994-11-01 | Nippon Thompson Co., Ltd. | Under seal device for a linear motion guide unit |
| US5362155A (en) * | 1992-10-13 | 1994-11-08 | Nippon Thompson Co., Ltd. | Linear motion rolling guide unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845527A (en) * | 1981-09-12 | 1983-03-16 | 「寿」精版印刷株式会社 | Method and device for measuring density of ink of printed matter |
-
1984
- 1984-06-11 JP JP12050284A patent/JPS611717A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845527A (en) * | 1981-09-12 | 1983-03-16 | 「寿」精版印刷株式会社 | Method and device for measuring density of ink of printed matter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360271A (en) * | 1991-12-18 | 1994-11-01 | Nippon Thompson Co., Ltd. | Under seal device for a linear motion guide unit |
| US5362155A (en) * | 1992-10-13 | 1994-11-08 | Nippon Thompson Co., Ltd. | Linear motion rolling guide unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CS238291B1 (en) | Compacted deep foundation and method and equipment for its construction | |
| US20020071725A1 (en) | Earth support and permanent structural foundation wall | |
| US4453366A (en) | Process of forming a continuous wall in the ground | |
| JP2933901B2 (en) | Strengthening method for soft ground using slag | |
| KR101081343B1 (en) | Compaction grouting system | |
| JPH0547685B2 (en) | ||
| JPS611717A (en) | Ground improvement work by chemical stress | |
| RU2324788C2 (en) | Method of compressing soil and device for its implementation | |
| RU2286424C1 (en) | Bored cast-in-place stepped foundation and erection method | |
| JPH0552366B2 (en) | ||
| JP3760695B2 (en) | Ground improvement method | |
| Bilal et al. | A study on advances in ground improvement techniques | |
| JPH0475966B2 (en) | ||
| JP2003268771A (en) | Dry block, its molding form, its molding method and reinforcing earth structure using the dry block | |
| KR100687496B1 (en) | Construction method of pile for building | |
| JP3084141B2 (en) | Deep foundation method | |
| JP4189078B2 (en) | Construction method of underground structure in liquefied ground | |
| JP3380861B1 (en) | Pile construction method | |
| JP4927113B2 (en) | Ground stabilization method | |
| JPS615118A (en) | Formation work of over-all friction pile | |
| JPH01146009A (en) | Preventing work for liquefaction of ground | |
| JPH02104812A (en) | Ground reinforcing drain pipe | |
| Peer et al. | Soil Bearing Capacity and Techniques to Improve the Bearing Capacity of Soil | |
| JPS5845527B2 (en) | Expansion piling method | |
| JPS5918494B2 (en) | How to build soil structures |