JP2015090029A - Soil improvement method and modified soil material - Google Patents
Soil improvement method and modified soil material Download PDFInfo
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- JP2015090029A JP2015090029A JP2013230324A JP2013230324A JP2015090029A JP 2015090029 A JP2015090029 A JP 2015090029A JP 2013230324 A JP2013230324 A JP 2013230324A JP 2013230324 A JP2013230324 A JP 2013230324A JP 2015090029 A JP2015090029 A JP 2015090029A
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Abstract
Description
本発明は、土質改良方法及びこれを用いて製造された改質土材料に関する。 The present invention relates to a soil quality improving method and a modified soil material produced using the soil quality improving method.
従来から、土木・建築分野においてサンドコンパクションパイル工法等の地盤改良工法で使用する地盤改良材や、農業分野の肥料として、製鋼スラグが有効利用されている（例えば、特許文献１、特許文献２参照）。また、軟弱土に製鋼スラグを混合することにより、ＣＢＲ（California Bearing Ratio）を向上させる技術も提案、実施されている。 Conventionally, steelmaking slag has been effectively used as a ground improvement material used in a ground improvement method such as a sand compaction pile method in the civil engineering / architecture field or as a fertilizer in the agricultural field (see, for example, Patent Document 1 and Patent Document 2). ). Also, a technique for improving CBR (California Bearing Ratio) by mixing steelmaking slag with soft soil has been proposed and implemented.
しかしながら、単に製鋼スラグを土に混合して改質土材料を製造した場合、例えば、単にＣＢＲを向上させるように製鋼スラグを建設発生土などに混合して改質土材料を製造し、この改質土材料を盛土材として用いた場合には、含まれる細粒分が多いほど、また、盛土厚が大きくなるほど、圧密沈下が長期にわたって生じるケースがある。 However, when a modified soil material is produced simply by mixing steelmaking slag with soil, for example, the modified soil material is produced by simply mixing steelmaking slag with construction generated soil so as to improve CBR. When the soil material is used as the embankment material, there are cases where consolidation settlement occurs for a long time as the fine grain content increases or the embankment thickness increases.
また、単に製鋼スラグを肥料として黒ボク土などに混合して改質土材料を製造し、例えばこの改質土材料を植生法面の覆土として用いる場合には、降雨による流れ出しを抑止することが難しい。このため、肥沃度が高く洗掘されにくい材料が強く求められている。 In addition, steelmaking slag is simply mixed with black soil as fertilizer to produce a modified soil material. For example, when this modified soil material is used as vegetation cover, it is possible to prevent outflow due to rainfall. difficult. For this reason, there is a strong demand for materials that are highly fertile and difficult to scour.
本発明は、上記事情に鑑み、製鋼スラグを土に混合し、盛土材や植生材などとして好適に利用可能に改質するための土質改良方法及びこれを用いて製造した改質土材料を提供することを目的とする。 In view of the above circumstances, the present invention provides a soil improvement method for mixing steelmaking slag into soil and modifying it suitably for use as embankment material, vegetation material, and the like, and a modified soil material manufactured using the same. The purpose is to do.
上記の目的を達するために、この発明は以下の手段を提供している。 In order to achieve the above object, the present invention provides the following means.
本発明の土質改良方法は、粘性土に製鋼スラグを混合して砂質土に改質するようにしたことを特徴とする。 The soil quality improvement method of the present invention is characterized in that steelmaking slag is mixed with viscous soil to be modified into sandy soil.
また、本発明の土質改良方法においては、前記粘性土が建設発生土であることが望ましい。 In the soil quality improvement method of the present invention, it is desirable that the cohesive soil is construction generated soil.
さらに、本発明の土質改良方法においては、前記製鋼スラグを１０〜３５重量％の割合となるように混合することがより望ましい。 Furthermore, in the soil improvement method of this invention, it is more desirable to mix the said steelmaking slag so that it may become a ratio of 10 to 35 weight%.
本発明の改質土材料は、上記のいずれかの土質改良方法を用いて製造されたことを特徴とする。 The modified soil material of the present invention is manufactured using any one of the above soil quality improving methods.
本発明の土質改良方法及び改質土材料においては、従来のように単に製鋼スラグを土に混合するのではなく、粘性土に製鋼スラグを混合して砂質土に改質するようにしたことで、盛土材や植生材などとして好適に利用可能な改質土材料を得ることが可能になる。 In the soil improvement method and the modified soil material of the present invention, the steelmaking slag is not mixed with the soil as in the prior art, but the steelmaking slag is mixed with the viscous soil to improve the sandy soil. Thus, it becomes possible to obtain a modified soil material that can be suitably used as a banking material or a vegetation material.
以下、本発明の一実施形態に係る土質改良方法及び改質土材料について説明する。 Hereinafter, a soil improvement method and a modified soil material according to an embodiment of the present invention will be described.
本実施形態の土質改良方法は、例えば、製鉄（高炉・転炉・電炉等）時に発生する製鋼スラグを株式会社小松製作所製のリテラ等の土質改良機や、バックホウ等を用いて建設発生土（現場発生土）等の粘性土に混合撹拌し、その土質材料を砂質土に改質する。 The soil quality improvement method of the present embodiment is, for example, a method for producing steelmaking slag generated at the time of iron making (blast furnace, converter, electric furnace, etc.) using a soil quality improvement machine such as litera manufactured by Komatsu Ltd., backhoe etc. Mix and agitate with cohesive soil such as on-site generated soil) to modify the soil material to sandy soil.
なお、本発明における「粘性土」は細粒分を５０％以上含み、「砂質土」は細粒分を１５％以上５０％未満の割合で含むもの、あるいは「粘性土」は７５μｍふるい通過率が２５％以上、「砂質土」は７５μｍふるい通過率が２５％未満のものを示す。 In the present invention, “viscous soil” contains fine particles of 50% or more, “sandy soil” contains fine particles in a proportion of 15% to less than 50%, or “viscous soil” passes through a 75 μm sieve. The rate is 25% or more, and “sandy soil” indicates a 75 μm sieve passage rate of less than 25%.
さらに、本実施形態では、製鋼スラグを１０〜３５重量％の割合となるように混合する。 Furthermore, in this embodiment, steelmaking slag is mixed so that it may become a ratio of 10 to 35 weight%.
ここで、例えば、路体や路床、擁壁下部地盤として本実施形態の土質改良方法で製造した改質土材料を使用する際に、バックホウを用いて製鋼スラグを３５重量％で混合したケース、土質改良機を用いて製鋼スラグを２８重量％で混合したケースで、設計ＣＢＲ＝５．５％を満足することが可能であった。また、路体や路床として本実施形態の土質改良方法で製造した改質土材料を使用する際に、バックホウを用いて製鋼スラグを２５重量％で混合したケース、土質改良機を用いて製鋼スラグを２０重量％で混合したケースで、設計ＣＢＲ＝４．０％を満足することが可能であった。さらに、バックホウを用いて製鋼スラグを１０重量％で混合したケースで、設計ＣＢＲ＝３．０％を満足することが可能であった。 Here, for example, when using the modified soil material produced by the soil improvement method of the present embodiment as a road body, a roadbed, and a retaining wall lower ground, a case where steelmaking slag is mixed at 35% by weight using a backhoe In the case where steelmaking slag was mixed at 28% by weight using a soil conditioner, it was possible to satisfy the design CBR = 5.5%. In addition, when using the modified soil material manufactured by the soil improvement method of this embodiment as a road body or a roadbed, steelmaking slag is mixed at 25% by weight using a backhoe, and steelmaking is performed using a soil improvement machine. In a case where slag was mixed at 20% by weight, it was possible to satisfy the design CBR = 4.0%. Furthermore, it was possible to satisfy the design CBR = 3.0% in a case where steelmaking slag was mixed at 10% by weight using a backhoe.
なお、このとき、建設発生土として、砂質火山灰質粘性土（ＩＩ型：７５μｍふるい通過率６２．４％）、砂質火山灰質粘性土（ＩＩ型：７５μｍふるい通過率５４．９％）、細粒分質砂（７５μｍふるい通過率２９．３％）、礫まじり砂質火山灰質粘性土（ＩＩ型：７５μｍふるい通過率７５．２％）、砂質火山灰質粘性土（ＩＩ型：７５μｍふるい通過率５８．８％）、礫まじり砂質火山灰質粘性土（ＩＩ型：７５μｍふるい通過率５１．９％）を使用した。 At this time, sandy volcanic ash clay (II type: 75 μm sieve passage rate 62.4%), sandy volcanic ash clay (II type: 75 μm sieve passage rate 54.9%), Fine grained sand (75 μm sieve passage rate 29.3%), gravelly sandy volcanic ash clay (type II: 75 μm sieve passage rate 75.2%), sandy volcanic ash clay (type II: 75 μm sieve) Passage rate 58.8%), gravelly sandy volcanic ash clay (type II: 75 μm sieve passage rate 51.9%) was used.
また、粘性土にセメント系固化材を混合して改質土材料を製造する場合には、袋処理・粉塵が発生する。生石灰を混合して改質土材料を製造する場合には、生石灰の混合に手間がかかり、また袋処理・粉塵が発生する上、高コスト化する。セメント石灰混合固化材を混合して改質土材料を製造する場合には、やはり、袋処理・粉塵が発生する上、高コスト化する。 In addition, when a modified soil material is produced by mixing cement-based solidifying material with viscous soil, bag treatment and dust are generated. In the case of producing a modified soil material by mixing quicklime, it takes time to mix quicklime, and bag processing and dust are generated, and the cost is increased. When a modified soil material is produced by mixing cement lime mixed solidifying material, bag treatment and dust are generated, and the cost is increased.
これに対し、粘性土に製鋼スラグを撹拌混合して改質土材料を製造する場合には、含水比を低減させて改質することができ、粒度分布を改善させるため取り扱いが良くなり、増強効果も得られ、混合時の粉塵が少ない等の多くの利点（改善点）を得ることができる。 On the other hand, when steelmaking slag is stirred and mixed with viscous soil to produce a modified soil material, it can be reformed by reducing the water content ratio, improving handling and improving the particle size distribution. An effect is also acquired and many advantages (improvement points) such as less dust during mixing can be obtained.
一方、製鋼スラグには、石灰、ケイ酸、苦土、酸化鉄、マンガン、リン酸、ほう酸等の肥料・栄養成分が含まれている。このため、粘性土に製鋼スラグを撹拌混合して改質土材料を製造する場合には、ｐＨ調整（酸性土の中和処理）が行なえ、また、製鋼スラグの肥料成分・栄養成分により肥沃度が上がり、稲作、畑作、牧草等に好適な土壌が得られる。さらに、製鋼スラグを適用混合することで、単位体積重量が増大する。 On the other hand, steelmaking slag contains fertilizers and nutritional components such as lime, silicic acid, bitter earth, iron oxide, manganese, phosphoric acid and boric acid. For this reason, when steelmaking slag is stirred and mixed with viscous soil to produce modified soil materials, pH adjustment (neutralization of acidic soil) can be performed, and fertility is increased by fertilizer and nutrient components of steelmaking slag. As a result, soil suitable for rice cultivation, field cultivation, pasture and the like can be obtained. Furthermore, unit volume weight increases by applying and mixing steelmaking slag.
したがって、本実施形態の土質改良方法及び改質土材料においては、製鋼スラグを混合撹拌して粘性土を砂質土に改質して改質土材料を製造・使用することにより、例えば航空機荷重等の大きな差異荷重が上載するような基盤施設に適用した場合であっても、将来沈下の抑制が可能になる。 Therefore, in the soil improvement method and the modified soil material of the present embodiment, the steelmaking slag is mixed and stirred to modify the viscous soil to the sandy soil, and the modified soil material is manufactured and used, for example, aircraft load. Even if it is applied to a base facility where a large differential load such as the above is applied, it will be possible to suppress settlement in the future.
また、粘性土に製鋼スラグを適量混合することで、土壌のｐＨ調整が可能になるとともに、単位体積重量が増大するため、洗掘・流出されにくく、優れた安定性を備え、且つ肥沃な改質土材料を得ることができる。これにより、法面の植生覆土などとして改質土材料を有効に使用することができる。 In addition, mixing an appropriate amount of steelmaking slag with viscous soil makes it possible to adjust the pH of the soil and increases the unit volume weight, making it difficult to scour and drain, providing excellent stability and fertile modification. A textured material can be obtained. Thereby, the modified soil material can be effectively used as a vegetation covering soil on a slope.
以上、本発明による土質改良方法及び改質土材料の一実施形態について説明したが、本発明は上記の実施の形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。 As mentioned above, although one embodiment of the soil quality improvement method and modified soil material by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. .
Claims (4)
前記粘性土が建設発生土であることを特徴とする土質改良方法。 In the soil improvement method of Claim 1,
A soil quality improving method, wherein the cohesive soil is construction generated soil.
前記製鋼スラグを１０〜３５重量％の割合となるように混合することを特徴とする土質改良方法。 In the soil quality improvement method according to claim 1 or claim 2,
A method for improving soil quality, comprising mixing the steelmaking slag so as to have a ratio of 10 to 35% by weight.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5293111A (en) * | 1976-01-30 | 1977-08-05 | Kobe Steel Ltd | Method of improving and reinforcing poor subsoil |
| JPS5839461B2 (en) * | 1978-05-13 | 1983-08-30 | 日本鋼管株式会社 | Soil improvement method |
| US4652310A (en) * | 1985-11-20 | 1987-03-24 | Nippon Magnetic Dressing Co., Ltd. | Process for making a hardening agent for weak soil or sludge from steel making slag |
| JP2000064343A (en) * | 1998-08-24 | 2000-02-29 | Kotoo:Kk | Excavated material mixer |
| JP2002045078A (en) * | 2000-05-22 | 2002-02-12 | Akinori Oki | Block produced by using waste of coal ash and others, and byproduct, group of gathering banks for fish, construction system for the same, and method for proliferating fishery resource |
| JP2005264455A (en) * | 2004-03-16 | 2005-09-29 | Tobishima Corp | Underground cavity filling method and filler for underground cavity |
| JP2011206625A (en) * | 2010-03-29 | 2011-10-20 | Jfe Steel Corp | Method for modifying dredged soil |
| JP2012149426A (en) * | 2011-01-18 | 2012-08-09 | Nippon Steel Corp | Manufacturing method of modified soil and water area environment restoration execution method |
| JP2012192382A (en) * | 2011-03-18 | 2012-10-11 | Toa Harbor Works Co Ltd | Method and system for treating dredged soil |
-
2013
- 2013-11-06 JP JP2013230324A patent/JP2015090029A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5293111A (en) * | 1976-01-30 | 1977-08-05 | Kobe Steel Ltd | Method of improving and reinforcing poor subsoil |
| JPS5839461B2 (en) * | 1978-05-13 | 1983-08-30 | 日本鋼管株式会社 | Soil improvement method |
| US4652310A (en) * | 1985-11-20 | 1987-03-24 | Nippon Magnetic Dressing Co., Ltd. | Process for making a hardening agent for weak soil or sludge from steel making slag |
| JP2000064343A (en) * | 1998-08-24 | 2000-02-29 | Kotoo:Kk | Excavated material mixer |
| JP2002045078A (en) * | 2000-05-22 | 2002-02-12 | Akinori Oki | Block produced by using waste of coal ash and others, and byproduct, group of gathering banks for fish, construction system for the same, and method for proliferating fishery resource |
| JP2005264455A (en) * | 2004-03-16 | 2005-09-29 | Tobishima Corp | Underground cavity filling method and filler for underground cavity |
| JP2011206625A (en) * | 2010-03-29 | 2011-10-20 | Jfe Steel Corp | Method for modifying dredged soil |
| JP2012149426A (en) * | 2011-01-18 | 2012-08-09 | Nippon Steel Corp | Manufacturing method of modified soil and water area environment restoration execution method |
| JP2012192382A (en) * | 2011-03-18 | 2012-10-11 | Toa Harbor Works Co Ltd | Method and system for treating dredged soil |
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