JP4716474B2 - Pile construction method using granulated blast furnace slag - Google Patents
Pile construction method using granulated blast furnace slag Download PDFInfo
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- JP4716474B2 JP4716474B2 JP2001247438A JP2001247438A JP4716474B2 JP 4716474 B2 JP4716474 B2 JP 4716474B2 JP 2001247438 A JP2001247438 A JP 2001247438A JP 2001247438 A JP2001247438 A JP 2001247438A JP 4716474 B2 JP4716474 B2 JP 4716474B2
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- density
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Description
【０００１】
【発明の属する技術分野】
本発明は、高炉水砕スラグを用いた杭の造成工法に関するものである。
【０００２】
【従来の技術】
本件特許出願人らは、先に、急冷高炉滓粗粒と石灰含有物質との混合材料を用いて締固め工法により軟弱地盤中に強度と透水性を具えた柱状や矢板状の硬化体を形成して軟弱地盤を改良・強化する技術を開発している（特公昭５３−１４８４９号公報参照）。
【０００３】
【発明が解決しようとする課題】
本発明が解決しようとする第１の課題（本発明の第１の目的）は、前記従来技術をさらに発展させて、高炉水砕スラグにセメント，石灰等のアルカリ刺激材と水分を添加した混合材料を用いて軟弱地盤に所定の強度と透水性を具えた杭を合理的に造成する高炉水砕スラグを用いた杭の造成工法を提供することにある。
【０００４】
また、本発明が解決しようとする第２の課題（本発明の第２の目的）は、前記従来技術と同様の混合材料を用いて締固め杭を造成して軟弱地盤を改良・強化する際に、杭体の透水性の管理は必要でなく、杭体の強度の管理のみが必要な場合があることに鑑み、この場合に有効な高炉水砕スラグを用いた杭の造成工法を提供することにある。
【０００５】
【課題を解決するための手段】
前記第１の課題を解決するために、本発明の請求項１記載の高炉水砕スラグを用いた杭の造成工法（以下、本発明の第１の工法という）では、軟弱地盤に、高炉水砕スラグにセメント，石灰等のアルカリ刺激材と水分を添加した混合材料を用いて所定の強度と透水性を具えた杭を締固め工法で造成する際に、アルカリ刺激材の添加量を一定にした混合材料の密度と一軸圧縮強度の関係図と、密度と透水係数の関係図から、所定の強度と透水性を確保するための混合材料の密度の範囲を定めるとともに、混合材料の密度と押圧力の関係図から、密度を前記定められた範囲にするための押圧力の範囲を定め、前記定められた範囲の押圧力で混合材料を締固めて杭を造成するようにしている。
【０００６】
また、前記第２の課題を解決するために、本発明の請求項２記載の高炉水砕スラグを用いた杭の造成工法（以下、本発明の第２の工法という）では、軟弱地盤に、高炉水砕スラグにセメント，石灰等のアルカリ刺激材と水分を添加した混合材料を用いて所定の強度を具えた杭を締固め工法で造成する際に、アルカリ刺激材の添加量を一定にした混合材料の密度と一軸圧縮強度の関係図から、所定の強度に対応する混合材料の密度を求めるとともに、混合材料の密度と押圧力の関係図から、前記密度に対応する押圧力を求め、少なくともこの押圧力で混合材料を締固めて杭を造成するようにしている。
【０００７】
なお、締固め工法による杭の造成は、杭造成用のケーシングを地中の所定深度まで貫入した後、引抜き工程において引抜きと再貫入を繰り返し、引抜き時にケーシングの下端から排出した杭材料を再貫入時にケーシングの下端で押圧して締固めるという態様でなされ、ケーシングの下端で杭材料を押圧する力（押圧力）は通常、ケーシング貫入・引抜き装置の油圧値で表される。
【０００８】
【発明の実施の形態】
高炉水砕スラグにセメント，石灰等のアルカリ刺激材と水分を添加した混合材料は、アルカリ刺激材の添加量が多いほど、また、密度（乾燥単位体積重量）が大きいほど、硬化後の強度が大きくなる反面、透水性が悪くなる傾向がある。
【０００９】
そこで、本発明の第１の工法では、先ず、混合材料におけるアルカリ刺激材の添加量を定めた後、この定められた量のアルカリ刺激材を添加した混合材料の密度と一軸圧縮強度の関係図と、密度と透水係数の関係図を作成し、これを利用して所定の強度と透水性を確保するために必要な混合材料の密度の範囲を定める。
【００１０】
アルカリ刺激材の添加量は、強度の面では多いほどよいが、品質の確保とコストの低廉の両面からみて重量比で５〜１０％が適当と考えられるので、この範囲内で適当に（例えば８％）に定めればよい。
【００１１】
密度と一軸圧縮強度の関係図と、密度と透水係数の関係図は、原則として室内試験（一軸圧縮試験と透水試験）を行って作成するが、工事実績データが蓄積されたならばそれを利用して作成してもよい。
【００１２】
図１は混合材料の密度と一軸圧縮強度の関係図、図２は同じく密度と透水係数の関係図であり、図１で所定の強度（一軸圧縮強度Ｓ０）に対応する密度Ｄ１を求め、図２で所定の透水性（透水係数Ｋ０）に対応する密度Ｄ２を求めれば、密度Ｄ１が所定の強度と透水性を確保するために必要な混合材料の密度の下限値、密度Ｄ２が同じく上限値である。
【００１３】
本発明の第１工法では、前述のようにして所定の強度と透水性を確保するために必要な混合材料の密度の範囲を定めるとともに、密度と押圧力の関係図を利用して、密度を前述の定められた範囲にするために必要な押圧力の範囲を定めるが、密度と押圧力の関係図も試験（現場での施工試験）を行って作成する外、工事実績データから作成してもよい。
【００１４】
図３は混合材料の密度と押圧力の関係図であり、図３で密度Ｄ１に対応する押圧力Ｐ１と密度Ｄ２に対応する押圧力Ｐ２を求めれば、押圧力Ｐ１が所定の強度と透水性を確保するための押圧力の下限値、押圧力Ｐ２が同じく上限値である。
【００１５】
前述のようにして、所定の強度と透水性を確保するために必要な押圧力の範囲がＰ１を下限，Ｐ２を上限として定められたら、押圧力がこの範囲になるようにして締固め杭の施工を行えばよく、かくして所定の強度と透水性を具えた杭を合理的に造成することができる。
【００１６】
本発明の第２の工法は、前述のように、混合材料を用いて造成される杭の透水性を管理する必要はなく、強度のみを管理すればよい場合（所定の強度のみを確保すればよい場合）に適用されるものであり、その実施は、まず、図１で所定の強度（一軸圧縮強度Ｓ０）に対応する密度Ｄ１を求め、それから、図３で密度Ｄ１に対応する押圧力Ｐ１を求め、少なくともこの押圧力Ｐ１で締固め杭の施工を行う、という態様でなされる。
【図面の簡単な説明】
【図１】混合材料の密度と一軸圧縮強度の関係図である。
【図２】混合材料の密度と透水係数の関係図である。
【図３】混合材料の密度と押圧力の関係図である。
【符号の説明】
Ｄ１：密度、Ｓ０：強度、Ｄ２：密度、Ｋ０：透水係数、Ｐ１：押圧力、Ｐ２：押圧力。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile construction method using blast furnace granulated slag.
[0002]
[Prior art]
The patent applicants previously formed a columnar or sheet pile-shaped cured body with strength and water permeability in soft ground by a compaction method using a mixture of quenched blast furnace coarse particles and lime-containing material. As a result, a technique for improving and strengthening soft ground has been developed (see Japanese Patent Publication No. 53-14849).
[0003]
[Problems to be solved by the invention]
The first problem to be solved by the present invention (first object of the present invention) is a further development of the above-mentioned prior art, in which blast furnace granulated slag is mixed with an alkali stimulating material such as cement and lime and moisture. An object of the present invention is to provide a pile construction method using blast furnace granulated slag that rationally creates a pile having a predetermined strength and water permeability on soft ground using a material.
[0004]
Further, the second problem to be solved by the present invention (second object of the present invention) is that when a compacted pile is formed using the same mixed material as in the prior art to improve and strengthen soft ground. In addition, in view of the fact that it is not necessary to manage the permeability of the pile body, and only the management of the strength of the pile body may be required, an effective pile construction method using blast furnace granulated slag is provided in this case There is.
[0005]
[Means for Solving the Problems]
In order to solve the first problem, in the pile construction method using the blast furnace granulated slag according to claim 1 of the present invention (hereinafter referred to as the first construction method of the present invention), When building a pile with a predetermined strength and water permeability using a mixed material in which alkali stimulating material such as cement and lime is added to crushed slag and water, the amount of alkali stimulating agent is kept constant. Based on the relationship between the density of the mixed material and the uniaxial compressive strength and the relationship between the density and the water permeability, the range of the density of the mixed material for ensuring the predetermined strength and water permeability is determined, and the density and the pressure of the mixed material are determined. From the relationship diagram of pressure, the range of the pressing force for setting the density within the predetermined range is determined, and the mixed material is compacted with the pressing force within the predetermined range to form a pile.
[0006]
In order to solve the second problem, in the pile construction method using the blast furnace granulated slag according to claim 2 of the present invention (hereinafter referred to as the second method of the present invention), in the soft ground, When a pile with a specified strength was made using a mixed material in which alkali stimulating materials such as cement and lime and moisture were added to granulated blast furnace slag, the amount of alkali stimulating material added was fixed. From the relationship diagram of the density of the mixed material and the uniaxial compressive strength, the density of the mixed material corresponding to the predetermined strength is obtained, and from the relationship diagram of the density of the mixed material and the pressing force, the pressing force corresponding to the density is obtained, A pile is formed by compacting the mixed material with this pressing force.
[0007]
In addition, pile creation by the compaction method is to repenetrate the pile material discharged from the lower end of the casing at the time of pulling out after the casing for pile building has penetrated to a predetermined depth in the ground and then repeatedly pulled and re-penetrated in the drawing process. It is sometimes done in such a manner that it is pressed and compacted at the lower end of the casing, and the force (pressing force) for pressing the pile material at the lower end of the casing is usually expressed by the hydraulic value of the casing penetration / drawing device.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The mixed material in which alkali stimulating materials such as cement and lime and moisture are added to granulated blast furnace slag, the greater the amount of alkali stimulating material added, and the greater the density (dry unit volume weight), the higher the strength after curing. On the other hand, the water permeability tends to deteriorate.
[0009]
Therefore, in the first construction method of the present invention, first, after determining the addition amount of the alkali stimulating material in the mixed material, the relationship between the density of the mixed material to which the determined amount of the alkali stimulating material is added and the uniaxial compressive strength Then, a relationship diagram between the density and the water permeability coefficient is created, and the density range of the mixed material necessary for ensuring a predetermined strength and water permeability is determined by using the relationship diagram.
[0010]
The addition amount of the alkali stimulating material is better in terms of strength, but it is considered that 5 to 10% by weight is appropriate in terms of ensuring quality and low cost. 8%).
[0011]
The relationship between density and uniaxial compressive strength and the relationship between density and hydraulic conductivity are created in principle by laboratory tests (uniaxial compression test and hydraulic conductivity test). If construction performance data is accumulated, use it. May be created.
[0012]
FIG. 1 is a diagram showing the relationship between the density of the mixed material and the uniaxial compressive strength. FIG. 2 is a diagram showing the relationship between the density and the hydraulic conductivity. FIG. 1 shows the density D1 corresponding to a predetermined strength (uniaxial compressive strength S0). 2, if the density D2 corresponding to a predetermined water permeability (water permeability coefficient K0) is obtained, the density D1 is the lower limit value of the density of the mixed material necessary to ensure the predetermined strength and water permeability, and the density D2 is also the upper limit value. It is.
[0013]
In the first construction method of the present invention, the density range of the mixed material necessary for ensuring the predetermined strength and water permeability is determined as described above, and the density is determined using the relationship diagram between the density and the pressing force. The range of the pressing force necessary to achieve the above-mentioned range is determined, but the relationship diagram between density and pressing force is also created from testing results (construction test on site) and from construction performance data. Also good.
[0014]
FIG. 3 is a diagram showing the relationship between the density of the mixed material and the pressing force. If the pressing force P1 corresponding to the density D1 and the pressing force P2 corresponding to the density D2 are obtained in FIG. 3, the pressing force P1 has a predetermined strength and water permeability. The lower limit value of the pressing force for securing the pressure and the pressing force P2 are also the upper limit value.
[0015]
As described above, when the range of the pressing force necessary to ensure the predetermined strength and water permeability is determined with P1 as the lower limit and P2 as the upper limit, the pressing force is within this range so that the compacted pile Construction can be performed, and thus a pile having a predetermined strength and water permeability can be rationally created.
[0016]
As described above, the second construction method of the present invention does not need to manage the water permeability of the pile constructed using the mixed material, and only needs to manage the strength (if only the predetermined strength is secured). First, a density D1 corresponding to a predetermined strength (uniaxial compressive strength S0) is obtained in FIG. 1, and then a pressing force P1 corresponding to the density D1 in FIG. 3 is applied. And at least the compaction pile is constructed with this pressing force P1.
[Brief description of the drawings]
FIG. 1 is a relationship diagram of the density of a mixed material and uniaxial compressive strength.
FIG. 2 is a diagram showing the relationship between the density of mixed materials and the hydraulic conductivity.
FIG. 3 is a relationship diagram of density of mixed material and pressing force.
[Explanation of symbols]
D1: density, S0: strength, D2: density, K0: hydraulic conductivity, P1: pressing force, P2: pressing force.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001247438A JP4716474B2 (en) | 2001-07-13 | 2001-07-13 | Pile construction method using granulated blast furnace slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001247438A JP4716474B2 (en) | 2001-07-13 | 2001-07-13 | Pile construction method using granulated blast furnace slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003027455A JP2003027455A (en) | 2003-01-29 |
| JP4716474B2 true JP4716474B2 (en) | 2011-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2001247438A Expired - Fee Related JP4716474B2 (en) | 2001-07-13 | 2001-07-13 | Pile construction method using granulated blast furnace slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061224A (en) * | 2013-01-25 | 2013-04-24 | 谢时雳 | Method for thawing and strengthening permafrost foundations by quicklime-sand piles |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864774A (en) * | 2012-10-10 | 2013-01-09 | 江苏南通六建建设集团有限公司 | Shrinkage treatment construction method for composite foundation- lime soil compaction piles |
| CN112921945A (en) * | 2021-01-27 | 2021-06-08 | 中钢集团马鞍山矿山研究总院股份有限公司 | Method for reinforcing soft soil foundation by taking industrial solid wastes as main raw materials |
| JP7839595B2 (en) * | 2023-04-11 | 2026-04-02 | 株式会社不動テトラ | A method for producing a fluidized sand composition. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5314849B2 (en) * | 1973-02-09 | 1978-05-20 | ||
| JPS5155111A (en) * | 1974-11-08 | 1976-05-14 | Kawasaki Steel Co | NANJAKU NENSEIDOJIBANNO KUTSUSAKUKOHO |
| JPS5162510A (en) * | 1974-11-27 | 1976-05-31 | Fudo Construction Co | PAIRUZOSEIKOHO |
| JPS58164814A (en) * | 1982-03-25 | 1983-09-29 | Fudo Constr Co Ltd | Sand pile construction method |
| JP2681824B2 (en) * | 1989-04-28 | 1997-11-26 | 不動建設株式会社 | Quality control method in ground improvement pile construction method |
| JP3368498B2 (en) * | 1999-08-23 | 2003-01-20 | 大成建設株式会社 | Ground improvement material and ground improvement method |
| JP3794019B2 (en) * | 2001-04-26 | 2006-07-05 | 大成建設株式会社 | Sandy ground compaction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061224A (en) * | 2013-01-25 | 2013-04-24 | 谢时雳 | Method for thawing and strengthening permafrost foundations by quicklime-sand piles |
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