JPH06116937A - Soft ground improving method - Google Patents
Soft ground improving methodInfo
- Publication number
- JPH06116937A JPH06116937A JP4301495A JP30149592A JPH06116937A JP H06116937 A JPH06116937 A JP H06116937A JP 4301495 A JP4301495 A JP 4301495A JP 30149592 A JP30149592 A JP 30149592A JP H06116937 A JPH06116937 A JP H06116937A
- Authority
- JP
- Japan
- Prior art keywords
- soft ground
- converter slag
- layer
- pile
- slag
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、転炉スラグを軟弱地盤
改良杭の杭体材料として利用する軟弱地盤改良工法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft ground improvement method using converter slag as a pile body material for soft ground improvement piles.
【０００２】[0002]
【従来の技術】従来の軟弱地盤改良工法としては、各種
ドレーン材料によるドレーン工法、砂杭によるサンドド
レーン工法・コンパクションパイル工法及び生石灰杭工
法等がある。又、従来の技術においては、転炉スラグの
生成後エージング処理を終えてから、転炉スラグを再資
源として利用している。2. Description of the Related Art Conventional soft ground improvement methods include a drain method using various drain materials, a sand drain method using sand piles, a compaction pile method, and a quick lime pile method. Further, in the conventional technique, the converter slag is reused as a resource after finishing the aging treatment after the generation of the converter slag.
【０００３】[0003]
【発明が解決しようとする課題】従来の軟弱地盤改良工
法は、各種ドレーン材料によるドレーン工法、砂杭によ
るサンドドレーン工法・コンパクションパイル工法及び
生石灰杭工法等があり、いずれの工法を使用しても、杭
体打設による地盤の圧密作用、毛細管現象による軟弱地
盤の脱水圧密作用及び生石灰杭特有の吸水膨張作用の３
作用の全てを完備する軟弱地盤改良工法は皆無で、総合
的な効果を期待することは難しいという問題点を有し
た。本発明は、転炉スラグパイルを打設して杭体打設に
よる地盤の圧密作用、毛細管現象による軟弱地盤の脱水
圧密作用及び生石灰杭特有の吸水膨張作用の３作用の全
てを完備する、高性能の優れた工法を提供することを目
的としている。Conventional soft ground improvement methods include the drain method using various drain materials, the sand drain method using sand piles, the compaction pile method, the quick lime pile method, and any of these methods is used. 3) Consolidation of the ground by driving piles, dehydration and consolidation of soft ground due to capillary phenomenon, and water absorption expansion characteristic of quicklime piles.
There is no soft ground improvement method that completes all the actions, and it is difficult to expect a comprehensive effect. The present invention completes all three functions of the consolidation operation of the ground by driving the converter slag pile and the pile body driving, the dehydration consolidation operation of the soft ground due to the capillary phenomenon, and the water absorption expansion operation peculiar to the quicklime pile. The purpose is to provide an excellent construction method.
【０００４】転炉スラグの生成後、未滓化状態で存在す
る、転炉スラグに含まれる遊離石灰相の水和反応による
膨張現象が約一か月に渡って進行するので、従来の技術
において転炉スラグの利用は、エージング処理により安
定化した後に適用されるものに限定されており、時間と
費用を要するので高価になり、再資源として転炉スラグ
の有効な活用の用途を広く見出すことは難しいという問
題点を有した。本発明は、転炉スラグの生成後エージン
グ処理を経ずに直ちに、転炉スラグを再資源として軟弱
地盤改良工法に利用する斬新なアイデアを採用してお
り、時間や費用を要しない、効率的な転炉スラグの再資
源活用の方法を提供することを目的としている。After the production of the converter slag, the expansion phenomenon due to the hydration reaction of the free lime phase contained in the converter slag, which is present in the unsmelted state, proceeds for about one month. Use of converter slag is limited to those applied after stabilization by aging treatment, and it takes time and cost, so it becomes expensive, and widely find applications for effective utilization of converter slag as a resource. Had the problem of being difficult. The present invention adopts a novel idea of utilizing converter slag as a resource for soft ground improvement method immediately after generation of converter slag without aging treatment, and does not require time or cost, and is efficient. The objective is to provide a method of utilizing the recycled resources of various converter slags.
【０００５】再生資源の利用の促進に関する法律によ
り、再資源の有効な活用が国家目的である現状にもかか
わらず、従来の技術においては、国内製鉄所の精鋼過程
で発生する膨大な転炉スラグを再資源として有効に活用
することができず、大半を産業廃棄物として処理してい
るという問題点を有した。本発明は、国内の製鉄所の精
鋼過程で発生する膨大な転炉スラグを再資源として大量
に活用することができる、安価で効果的な工法を提供す
ることを目的としている。According to the law concerning the promotion of utilization of recycled resources, despite the current state that the effective use of recycled resources is the national purpose, the conventional technology has a huge amount of converter slag generated in the steelmaking process of domestic steelworks. However, there is a problem in that most of the waste cannot be effectively used as a resource and is treated as industrial waste. An object of the present invention is to provide an inexpensive and effective construction method capable of utilizing a large amount of a huge amount of converter slag generated in the steel refinery process of a domestic steel mill as a resource.
【０００６】[0006]
【課題を解決するための手段及び作用】上記目的を達成
するため、転炉スラグの生成後、エージング処理を経ず
に転炉スラグを軟弱地盤層に打ち込み、軟弱地盤層を圧
密し、転炉スラグの持つ風化膨張性を軟弱地盤の改良要
素に活用するとともに、杭体打設初期の転炉スラグの間
隙を毛細管ドレーンとして利用して圧密を促進する。
又、転炉スラグの粒形を、砕石によるグラベルパイル工
法に使用している杭打設機械に適合する粒形にするとと
もに、転炉スラグの粒度分布が粗骨材標準粒度分布範囲
に適合するように、転炉スラグの粒形を適正に調整す
る。上記のように構成された本発明に使用する転炉スラ
グは、エージング処理を要せずに、製鉄所ストックヤー
ドから需要先へ船舶・車両により直接に搬入し、杭打設
機械を使用して、軟弱地盤層を転炉スラグで改良する。
杭打設機械は所定の口径の鋼管杭を具備しており、杭上
部に起振装置を備え、起振装置の下部の鋼管杭に転炉ス
ラグの材料投入ホッパーを設け、鋼管杭下部には打ち込
み沓を取り付け、起振装置の据えつけ台には吊り込み設
備を設けた構造で構成されている。杭打設機械の走行に
支障がないように表層改良を施した後に、軟弱地盤層上
に鋼管杭を打ち込む。打ち込まれた鋼管杭は打ち込み沓
により中空になるので、打設後材料投入ホッパーから転
炉スラグを投入する。転炉スラグの投入後鋼管杭を徐々
に引き抜くと、打ち込み沓は引き抜き時には開の状態に
なり、内部の転炉スラグを軟弱地盤層に残しながら鋼管
杭を上下方向に上げ下げして充填しつつ引き上げ、充填
により目減りした転炉スラグを補充する。このようにし
て、転炉スラグを軟弱地盤層の土砂中に充填して軟弱地
盤層を圧密し補強する。軟弱地盤層に打ち込まれた転炉
スラグパイルは、粗骨材標準粒度分布範囲内に適合され
ているので、軟弱地盤層から圧密によって絞りだされる
水分は打設初期の転炉スラグパイル中の骨材間の透き間
に浸透し、毛細管現象によって地表面に排出される。軟
弱地盤層の水分の排出により圧密が促進され、軟弱地盤
の粘着力及び一軸圧縮強度が大きくなるので、軟弱地盤
層の改良が進むことになる。更に、軟弱地盤層に打設し
た転炉スラグに含まれる、未滓化状態で存在する遊離石
灰相の水和反応による膨張現象が、約一か月に渡って進
行するので、上記の毛細管現象によってパイル全域の水
分を吸収しながら膨張が進み、水和反応に必要な水分を
吸収した状態で遊離石灰相のエージング処理を終了す
る。このような吸水及び膨張現象により軟弱地盤層の改
良が進行することになる。[Means and Actions for Solving the Problems] In order to achieve the above object, after the converter slag is produced, the converter slag is driven into the soft ground layer without being subjected to an aging treatment to consolidate the soft ground layer, and The weathering expansivity of slag is utilized as a factor for improving soft ground, and the gap of converter slag at the early stage of pile driving is used as a capillary drain to promote consolidation.
In addition, the grain shape of the converter slag is changed to a grain shape suitable for the pile driving machine used in the gravel pile construction method using crushed stone, and the particle size distribution of the converter slag conforms to the standard particle size distribution range of coarse aggregate. Adjust the grain shape of the converter slag appropriately. The converter slag used in the present invention configured as described above does not require aging treatment, and is directly carried in from a steel mill stockyard to a demand destination by a ship / vehicle, using a pile driving machine. , Improve soft ground layer with converter slag.
The pile driving machine is equipped with steel pipe piles with a predetermined diameter, equipped with a vibration exciter on the upper part of the pile, and provided a material input hopper for converter slag on the steel pipe pile below the vibration generator. It has a structure in which a driving gear is attached and a suspending equipment is provided on the mount of the vibration generator. After improving the surface layer so as not to hinder the running of the pile driving machine, the steel pipe pile is driven into the soft ground layer. Since the steel pipe piles that have been driven in will become hollow due to the driven slag, the converter slag will be charged from the material charging hopper after the driving. When the steel pipe pile is gradually pulled out after the converter slag is put in, the driving slag will be in an open state at the time of pulling out, and the steel pipe pile will be raised and lowered in the vertical direction while leaving the internal converter slag in the soft ground layer and pulled up while filling. , Replenish the converter slag that has been lost due to filling. In this way, the converter slag is filled in the soil of the soft ground layer to consolidate and reinforce the soft ground layer. Since the converter slag pile driven into the soft ground layer is fit within the standard particle size distribution range of the coarse aggregate, the water squeezed from the soft ground layer by consolidation is the aggregate in the converter slag pile at the initial stage of casting. It penetrates into the gaps and is discharged to the ground surface by capillary action. Consolidation is promoted by the discharge of water from the soft ground layer, and the adhesive strength and uniaxial compressive strength of the soft ground are increased, so that the soft ground layer is improved. Furthermore, since the expansion phenomenon due to the hydration reaction of the free lime phase existing in the unsmelted state contained in the converter slag cast in the soft ground layer proceeds for about one month, the above-mentioned capillary phenomenon As a result, the expansion proceeds while absorbing the water in the entire area of the pile, and the aging treatment of the free lime phase is completed in the state where the water necessary for the hydration reaction is absorbed. Due to such water absorption and expansion phenomenon, improvement of the soft ground layer will proceed.
【０００７】[0007]
【実施例】転炉スラグパイル（１）は臨海工業地帯、ウ
ォータフロント、塩田地帯等の軟弱地盤改良に幅広く利
用できるが、ここでは塩田地帯における広域な大深度の
軟弱地盤層（２）改良の実施例について述べる。軟弱地
盤層（２）上には杭打設機械（６）の作業性を確保する
ため、ファゴットシート（４）等の布製シートを張り、
砂を撒きだし適宜厚さのサンドマット層（５）を形成す
る。さらに、杭打設機械（６）の走行性を安定させるた
めに転炉スラグ層（３）を適宜厚さの層状に敷設する。
転炉スラグパイル（１）は、従来一般に施工されている
砕石によるグラベルパイル工法及び生石灰杭工法に使用
する杭打設機械（６）を使用する。まず、計画配置した
転炉スラグパイル（１）の打設位置に杭打設機械（６）
を据えつけ、杭位置を決める。打ち込みは、鋼管杭
（７）上部に取りつけた振動杭打機（８）により、軟弱
地盤層（２）上の転炉スラグ層（３）及びサンドマット
層（５）を貫通させて、鋼管杭（７）を所定深度の軟弱
地盤層（２）まで打ち込む。打ち込み後、鋼管杭（７）
上部に具備した材料投入ホッパー（９）により、転炉ス
ラグ（１０）を投入し、振動杭打機（８）を上下に移動
させながら、転炉スラグ（１０）を軟弱地盤層（２）に
充填していく。鋼管杭（７）下端の打ち込み沓（１１）
は、引き抜き時には開の状態になっており、内部の転炉
スラグ（１０）を軟弱地盤層（２）中に残しながら、鋼
管杭（７）を上下方向に上げ下げして充填しつつ引き上
げ、充填により目減りした転炉スラグ（１０）を補充す
る。このようにして、転炉スラグを軟弱地盤層中の土砂
に充填して軟弱地盤層を圧密し補強する。軟弱地盤層
（２）中に打ち込まれた転炉スラグパイル（１）は、粗
骨材標準粒度分布範囲に適合されているので、軟弱地盤
層（２）から圧密によって絞りだされる水分は打設初期
の転炉スラグパイル（１）中の骨材間の透き間に浸透
し、毛細管現象によって地表面に排出される。軟弱地盤
層（２）中の水分の排出により圧密は促進され、軟弱地
盤層（２）の粘着力及び一軸圧縮強度は大きくなり、地
盤の改良が進むことになる。さらに、軟弱地盤層（２）
に打設した転炉スラグ（１０）に含まれる、未滓化状態
で存在する遊離石灰相の水和反応による膨張現象が、約
一か月に渡って進行するので、上記の毛細管現象によっ
て転炉スラグパイル（１）全域に水分を吸収しながら膨
張が進み、遊離石灰相は軟弱地盤層（２）内のＣａイオ
ンを吸着する化学活性の強い土と反応し、地盤を圧密・
改良しながら遊離石灰相のエージングを終了する。この
ような吸水・膨張現象により、地盤の改良はさらに進行
することになる。[Example] The converter slag pile (1) can be widely used for soft ground improvement in coastal industrial areas, waterfront, salt fields, etc. An example will be described. In order to ensure workability of the pile driving machine (6) on the soft ground layer (2), a fabric sheet such as a fagot sheet (4) is stretched,
Sand is sprinkled out to form a sand mat layer (5) having an appropriate thickness. Further, in order to stabilize the traveling performance of the pile driving machine (6), the converter slag layer (3) is laid in a layer having an appropriate thickness.
As the converter slag pile (1), a pile driving machine (6) used for the gravel pile construction method using crushed stone and the quicklime pile construction method that are generally used conventionally is used. First, the pile driving machine (6) is installed at the planned pouring position of the converter slag pile (1).
Install and set the pile position. The driving is performed by vibrating the converter slag layer (3) and the sand mat layer (5) on the soft ground layer (2) with a vibrating pile driver (8) attached to the upper part of the steel pipe pile (7), (7) is driven into the soft ground layer (2) of a predetermined depth. After driving, steel pipe pile (7)
The converter slag (10) is charged by the material charging hopper (9) provided in the upper part, and the converter slag (10) is moved to the soft ground layer (2) while moving the vibrating pile driver (8) up and down. Fill it. Steel pipe pile (7) Drive bottom (11)
Is an open state at the time of withdrawal, and while leaving the internal converter slag (10) in the soft ground layer (2), the steel pipe pile (7) is raised and lowered in the vertical direction, and is pulled up while being filled. To replenish the converter slag (10) that has been depleted. In this way, the converter slag is filled in the earth and sand in the soft ground layer to consolidate and reinforce the soft ground layer. Since the converter slag pile (1) driven into the soft ground layer (2) conforms to the standard particle size distribution range of coarse aggregate, the water squeezed from the soft ground layer (2) by consolidation is cast. It penetrates into the gaps between the aggregates in the initial converter slag pile (1) and is discharged to the ground surface by the capillary phenomenon. Consolidation is promoted by the discharge of water in the soft ground layer (2), the adhesive strength and uniaxial compression strength of the soft ground layer (2) are increased, and the ground is improved. Furthermore, soft ground layer (2)
Since the expansion phenomenon due to the hydration reaction of the free lime phase existing in the unsmelted state contained in the converter slag (10) cast in No. 1 progresses for about one month, it is converted by the above capillary phenomenon. Expansion proceeds while absorbing water throughout the furnace slag pile (1), and the free lime phase reacts with soil with strong chemical activity to adsorb Ca ions in the soft ground layer (2), consolidating the ground.
Finish the aging of the free lime phase while improving. Due to such water absorption and expansion phenomenon, the improvement of the ground will be further advanced.
【０００８】[0008]
【発明の効果】本発明は、以上に説明したように構成さ
れているので、以下に記載するような効果を有する。杭
体打設による地盤の圧密作用、毛細管現象による軟弱地
盤の脱水圧密作用及び生石灰杭特有の吸水膨張作用の３
作用の全てを具備する、高性能の優れた工法である。Since the present invention is constructed as described above, it has the following effects. Consolidation of the ground by driving piles, dehydration and consolidation of soft ground due to capillary action, and water absorption expansion characteristic of quicklime piles.
It is a high-performance and excellent construction method that has all the functions.
【０００９】転炉スラグの生成後、エージング処理を経
ずに転炉スラグを軟弱地盤改良工法に直接使用する、斬
新なアイデアを採用しており、転炉スラグを再資源とし
て安価に利用するに適した、時間や費用を要しない効率
的な工法である。After the converter slag is produced, the novel idea of directly using the converter slag in the soft ground improvement method without aging treatment is adopted, and the converter slag can be used as a resource at low cost. It is a suitable and efficient construction method that does not require time or cost.
【００１０】国内の製鉄所の精鋼過程で発生する産業廃
棄物としての膨大な転炉スラグを、再資源として大量に
リサイクルすることのできる、優れた工法である。This is an excellent construction method which can recycle a large amount of a huge amount of converter slag as industrial waste generated in the steel refinery process of a domestic steel mill as a resource.
【図１】軟弱地盤改良工法の実施例を示す縦断面図であ
る。FIG. 1 is a vertical cross-sectional view showing an example of a soft ground improvement method.
１ 転炉スラグパイル ２ 軟弱地盤層 ３ 転炉スラグ層 ４ フアゴットシート ５ サンドマット層 ６ 杭打設機械 ７ 鋼管杭 ８ 振動杭打機 ９ 材料投入ホッパー １０ 転炉スラグ １１ 打ち込み沓 1 Converter slag pile 2 Soft ground layer 3 Converter slag layer 4 Fargot sheet 5 Sand mat layer 6 Pile driving machine 7 Steel pipe pile 8 Vibrating pile driver 9 Material input hopper 10 Converter slag 11 Driving slag
Claims (1)
弱地盤層（２）を改良する軟弱地盤改良工法。1. A soft ground improvement method for improving a soft ground layer (2) by placing a converter slag pile (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4301495A JPH06116937A (en) | 1992-10-01 | 1992-10-01 | Soft ground improving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4301495A JPH06116937A (en) | 1992-10-01 | 1992-10-01 | Soft ground improving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06116937A true JPH06116937A (en) | 1994-04-26 |
Family
ID=17897607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4301495A Pending JPH06116937A (en) | 1992-10-01 | 1992-10-01 | Soft ground improving method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06116937A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003082649A (en) * | 2001-09-05 | 2003-03-19 | Geotop Corp | Improvement method of soft ground |
| KR100380813B1 (en) * | 2000-01-05 | 2003-04-18 | 주식회사 동아기술공사 | Pre-Loading construction method using Steel-Making Slags as Pre-Load Materials |
| CN1296567C (en) * | 2000-12-28 | 2007-01-24 | 西胁醇 | Execution method of pile |
-
1992
- 1992-10-01 JP JP4301495A patent/JPH06116937A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100380813B1 (en) * | 2000-01-05 | 2003-04-18 | 주식회사 동아기술공사 | Pre-Loading construction method using Steel-Making Slags as Pre-Load Materials |
| CN1296567C (en) * | 2000-12-28 | 2007-01-24 | 西胁醇 | Execution method of pile |
| JP2003082649A (en) * | 2001-09-05 | 2003-03-19 | Geotop Corp | Improvement method of soft ground |
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