JP2023104032A - Soil improvement method - Google Patents
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- 239000002689 soil Substances 0.000 title claims abstract description 84
- 230000006872 improvement Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 238000009628 steelmaking Methods 0.000 claims description 52
- 239000004575 stone Substances 0.000 claims description 37
- 238000010276 construction Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 19
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract 4
- 239000010959 steel Substances 0.000 abstract 4
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 238000011156 evaluation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
本発明は、軟弱土、軟泥土などの地盤の土質改良方法に関するものである。 TECHNICAL FIELD The present invention relates to a soil improvement method for ground such as soft soil and soft mud.
現在の社会情勢に目を向ければ、建設事業からの発生土や廃棄物などの建設副産物の処理が大きな社会問題になっている。建設事業からの発生土はこれまで、余剰土や不良土として処理されることが多かった。このような建設発生土を積極的かつ有効的に利用することは、経済性、施工性といった観点のみならず、環境面からも社会的な要請となっている。例えば我が国には火山灰質粘性土をはじめとして、軟弱な粘性土が多く分布しており、このような場所での建設工事の多くは、これらの軟弱な粘性土を取り扱うことが多くなる。これらの軟弱土の改良や建設発生土の有効利用を積極的に図るために、有効かつ経済的な土質改良方法が求められている。 Looking at the current social situation, the disposal of construction by-products such as soil and waste from construction projects has become a major social problem. Soil generated from construction projects has traditionally been disposed of as surplus or poor soil. Active and effective use of such soil generated from construction is a social demand not only from the viewpoint of economic efficiency and workability, but also from the environmental point of view. For example, in Japan, a lot of soft cohesive soil, including volcanic ash cohesive soil, is distributed, and most of the construction work in such places involves handling these soft cohesive soils. In order to actively improve these soft soils and effectively utilize construction-generated soil, an effective and economical soil improvement method is required.
地盤の改良方法としては、石灰系材料（生石灰、消石灰、ドロマイトなど）を主体とする改良材を、軟弱土と混合する方法（非特許文献１）や、SPC（Sand Compaction Pile）と称する杭打ちを基本とした地盤改良方法（非特許文献２）が一般的である。 Ground improvement methods include a method of mixing an improvement material mainly composed of lime-based materials (quicklime, slaked lime, dolomite, etc.) with soft soil (Non-Patent Document 1), and a pile driving called SPC (Sand Compaction Pile). Ground improvement method based on (Non-Patent Document 2) is common.
しかし、石灰系材料による軟弱土の改良方法では、改良材が粉状であるため、粘性土との均一混合が難しいうえ、改良材の混合作業の際に粉状の改良材が大気中に逸散して粉塵が発生するため、周辺の住宅地の住民からの苦情対象になるという難点があった。また、改良材は粉状であるため、軟泥土との混合が十分にできた場合であっても、石灰と水分との消化反応による土質改善効果しか発揮されず、粒分の添加による粒度改善効果は全く期待できず、十分な粒度改善効果を得ることはできなかった。 However, in the method of improving soft soil with lime-based materials, it is difficult to uniformly mix the improving material with cohesive soil because the improving material is powdery, and the powdery improving material escapes into the atmosphere during the mixing work of the improving material. Since it scatters and generates dust, there was a drawback that it became a target of complaints from residents of the surrounding residential areas. In addition, since the improvement material is in the form of powder, even if it is sufficiently mixed with the soft mud, only the soil improvement effect due to the digestive reaction between lime and water is exhibited, and the grain size is improved by adding grains. No effect could be expected at all, and a sufficient particle size improvement effect could not be obtained.
また、杭打ち施工を主体とするSPC工法は広範囲かつ深層の土質改良方法であり、大規模な工業団地、臨海飛行場、港湾工事などの地盤改良に適している。しかし、道路工事の路床や路体の改良には、工事費用や杭打機の準備などの点で適していない。また住宅地の基礎工事に伴う狭地の浅層改良にも適していない。 In addition, the SPC construction method, which mainly involves pile driving, is a method of soil improvement in a wide range and depth, and is suitable for ground improvement in large-scale industrial parks, coastal airports, harbor construction, etc. However, it is not suitable for improving roadbeds and road bodies in road construction in terms of construction costs and preparation of pile drivers. In addition, it is not suitable for shallow improvement of narrow land associated with foundation work in residential areas.
上記したように、従来の土質改良方法は粉塵発生などの作業環境の問題、施工費用などのコスト面の問題が内在していた。従って本発明の目的はこのような従来技術の問題を解決し、作業環境の問題がなく、低コストで施工することができる土質改良方法を提供することである。 As described above, the conventional soil improvement method has inherent problems in the work environment such as dust generation and cost problems such as construction costs. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the prior art, and to provide a soil improvement method that can be performed at a low cost without the problem of working environment.
本発明者は上記の課題を解決するために検討を重ねた結果、CaOを含みかつ粒状である製鋼スラグ砕石のうち、特定の性状のものを改良材として用いることにより、優れた土質改良効果が得られることを発見した。本発明はこの知見に基づいて完成されたものであって、第１の発明は、軟弱土又は軟泥土に、製鋼スラグ砕石を混合することにより、土質強度を向上させる土質改良方法であって、前記製鋼スラグ砕石として、吸水率が３％以上の多孔質の製鋼スラグ砕石を用いることを特徴とするものである。また第２の発明は、軟弱土又は軟泥土に、製鋼スラグ砕石を混合することにより、土質強度を向上させる土質改良方法であって、前記製鋼スラグ砕石として、塩基度が３以上の製鋼スラグ砕石を用いることを特徴とするものである。何れの発明においても、製鋼スラグ砕石の混合率を、容積比で1/4～1/2とすることが好ましい。 As a result of repeated studies to solve the above problems, the inventors of the present invention have found that using steelmaking slag crushed stone that contains CaO and is granular and has specific properties as an improvement material has an excellent soil improvement effect. I found what I got. The present invention was completed based on this finding, and the first invention is a soil improvement method for improving soil strength by mixing steelmaking slag crushed stone with soft soil or ooze, comprising: The steelmaking slag crushed stone is characterized by using porous steelmaking slag crushed stone having a water absorption of 3% or more. A second invention is a soil improvement method for improving soil strength by mixing steelmaking slag crushed stone into soft soil or soft mud, wherein the steelmaking slag crushed stone having a basicity of 3 or more is used as the steelmaking slag crushed stone. is characterized by using In any invention, the mixing ratio of the crushed steelmaking slag is preferably 1/4 to 1/2 by volume.
なお、軟泥土は生物の遺骸を重量の30％以上含み、水分が多く、見た目で泥が多いと感じられる土である。また、軟弱土は火山灰質粘性土をはじめとする土質強度が低い軟弱な粘性土である。しかし何れも軟弱地盤を構成するものであり、本発明においては軟弱土と軟泥土を区別する必要はない。 Soft mud contains 30% or more of the weight of the corpses of living things, has a lot of moisture, and looks like a lot of mud. Also, soft soil is soft cohesive soil with low soil strength, such as volcanic ash cohesive soil. However, both constitute soft ground, and there is no need to distinguish between soft soil and soft mud soil in the present invention.
本発明においては、軟弱土又は軟泥土に、吸水率が３％以上の多孔質の製鋼スラグ砕石、あるいは塩基度が３以上の製鋼スラグ砕石を混合することにより、土質強度を向上させることができる。製鋼スラグ砕石による土質を改質するメカニズムとしては、（１）製鋼スラグ砕石中の石灰分と軟弱土又は軟泥土中の水分とが反応して土質全体としても水分が減少し、疎水化することによる強度発現、（２）粒、礫分を混合することによる粒度改善効果による強度発現、（３）混合後、養生することにより土質中の各種イオン成分のポゾラン反応（製鋼スラグ中のCaOと土質中の可溶性シリカとの反応）が進行し、新しい硬化鉱物が生成されることによる強度発現、などを挙げることができる。また、従来の粉状の改良材とは異なり、製鋼スラグ砕石は粒状や礫状であるため、混合時に粉塵が発生することもなく、作業環境の問題がない。しかも製鋼スラグ砕石は製鋼工程から発生する副産物であって安価であり、コストの引き下げを図ることができる。 In the present invention, soil strength can be improved by mixing porous steelmaking slag crushed stone with a water absorption of 3% or more or steelmaking slag crushed stone with a basicity of 3 or more into soft soil or soft mud. . Mechanisms for soil modification by steelmaking slag crushed stone are as follows: (1) The lime content in the steelmaking slag crushed stone reacts with the moisture in the soft soil or soft mud, and the water content of the soil as a whole is reduced, making the soil hydrophobic. (2) strength development due to the effect of improving the grain size by mixing grains and gravel; reaction with soluble silica in the inside) progresses, and strength is developed due to the generation of new hardened minerals. In addition, unlike conventional powdery improvers, steelmaking slag crushed stone is in the form of granules or pebbles, so no dust is generated during mixing, and there is no problem in the working environment. Moreover, the crushed steelmaking slag is a by-product generated from the steelmaking process and is inexpensive, so that the cost can be reduced.
以下に本発明の実施形態を説明する。
製鋼スラグは溶銑を製鋼する工程から発生するスラグであり、CaO、SiO２、Al２O３を主成分とし、さらにMnO、FeO、MgOなどが含まれている。特にCaOは30-60％程含有されていて、その一部はスラグ中に熔融しきれず、未熔融の遊離生石灰（Free Lime）として数％存在している。製鋼スラグは破砕、篩分け後、粒径を0～25ｍｍに調整（30ｍｍ以下、40ｍｍ以下の場合もある）して製鋼スラグ砕石とし、従来から道路路盤材などの土木用資材として用いられている。
Embodiments of the present invention are described below.
Steelmaking slag is slag generated in the process of making molten pig iron, and contains CaO, SiO 2 and Al 2 O 3 as main components, and also contains MnO, FeO, MgO and the like. In particular, CaO is contained about 30 to 60%, and a part of it cannot be completely melted in the slag and exists as unmelted free lime (Free Lime) at several percent. Steelmaking slag is crushed, sieved, and then adjusted to a particle size of 0 to 25mm (30mm or less, sometimes 40mm or less) to make steelmaking slag crushed stone, which has been used as a civil engineering material such as roadbed materials. .
本発明ではこのような製鋼スラグ砕石を、軟弱土又は軟泥土に混合する。製鋼スラグ砕石の混合率は多すぎると土量が過多となり施工現場から搬出する残土が増えて、手数とコストが嵩むデメリットが生じる。このため事前配合試験に依る適正混合率の見極めが重要である。施工現場の状況や施工現場の工事前後の地盤高さの変化にもよるが、現土に対する製鋼スラグ砕石の混合率は1/2から1/4程度が好ましく、1/3前後が更に好ましい。 In the present invention, such steelmaking slag crushed stone is mixed with soft soil or soft mud. If the mixing ratio of steelmaking slag crushed stone is too high, the amount of soil becomes excessive and the surplus soil to be carried out from the construction site increases, resulting in the disadvantage of increased labor and cost. Therefore, it is important to ascertain the appropriate mixing ratio through preliminary mixing tests. Depending on the conditions of the construction site and changes in ground level before and after the construction site, the mixing ratio of steelmaking slag crushed stone to the existing soil is preferably about 1/2 to 1/4, more preferably about 1/3.
本発明者らは、表１に示す成分と特徴を有する製鋼スラグ砕石を、CBR＝2％の軟泥土と混合して、１週間養生後のCBRを測定し、土質改良効果を調査した。いずれの実験例の混合比も、容積比で、現土：製鋼スラグ砕石＝2：1（混合比：33％）とした。CBR試験は路床支持力比の試験であり、直径5cmのピストンを1mm/minで貫入させながら、貫入量2.5mm及び5.0mmにおける荷重を読み取る方法で行われる。詳細はJIS A 1211「CBR試験方法」に規定されており、これに準拠して測定を行った。 The present inventors mixed steelmaking slag crushed stone having the components and characteristics shown in Table 1 with soft mud having a CBR of 2%, measured the CBR after curing for one week, and investigated the soil improvement effect. The mixing ratio in each experimental example was set at a volume ratio of local soil: crushed steelmaking slag = 2:1 (mixing ratio: 33%). The CBR test is a roadbed bearing capacity ratio test, and is carried out by reading the load at penetration depths of 2.5mm and 5.0mm while penetrating a piston with a diameter of 5cm at 1mm/min. Details are specified in JIS A 1211 "CBR test method", and the measurement was performed in accordance with this.
現土はCBR＝2％の粘土質で支持力がなく、現土単味の上部では人が自立できない状態であった。この現土に比較例として示した緻密質の製鋼スラグ砕石を混合、養生した後のCBRは15％であった。現土に比べてCBRは顕著に増加して土質改良が認められたが、通常の客土はCBR＝20％を目途に行われており、そのレベルには達していなかった。 The existing soil was clayey with a CBR of 2% and had no bearing capacity. CBR was 15% after mixing and curing the dense steelmaking slag crushed stone shown as a comparative example to this soil. Compared to the original soil, the CBR increased markedly and the soil improvement was recognized, but the CBR = 20% was usually achieved with the additional soil, and it did not reach that level.
次に実施例１では、吸水率が4.9％の多孔質の製鋼スラグ砕石をCBR＝2％の現土に混合、養生した。その結果、混合直後のCBRは25％まで向上し、さらに７日間の養生を行った後のCBRは40％まで増加し、大幅な土質改良効果が認められた。図１はこのCBR値の変化を示すグラフである。混合直後のCBRが上昇したのは、製鋼スラグ砕石を混合したことによる粒度改善効果と、多孔質の製鋼スラグ砕石を混合したことによる吸水効果による。更に７日間の養生を行うことによりポゾラン反応が進行し、CBRは40％まで増加した。 Next, in Example 1, porous steelmaking slag crushed stone having a water absorption of 4.9% was mixed with the existing soil having a CBR of 2% and cured. As a result, the CBR immediately after mixing improved to 25%, and after curing for 7 days, the CBR increased to 40%, demonstrating a significant soil improvement effect. FIG. 1 is a graph showing changes in this CBR value. The increase in CBR immediately after mixing is due to the particle size improvement effect of mixing steelmaking slag crushed stone and the water absorption effect of mixing porous steelmaking slag crushed stone. After 7 days of curing, the pozzolanic reaction progressed and the CBR increased to 40%.
次に実施例２では、塩基度（CaO/SiO2）が３以上の高塩基度の製鋼スラグ砕石（吸水率：5～7％）を現土に混合、養生した。混合、養生した後のCBRは100％まで増加し、更に大幅な土質改良効果が認められた。これらの比較例、実施例１、実施例２の混合、養生後のCBR値を図２に示した。 Next, in Example 2, high-basicity steelmaking slag crushed stone (water absorption: 5 to 7%) having a basicity (CaO/SiO 2 ) of 3 or more was mixed with the soil and cured. After mixing and curing, the CBR increased to 100%, and a further significant soil improvement effect was recognized. FIG. 2 shows the CBR values after mixing and curing of these comparative examples, examples 1 and 2.
本発明者らは、同様の調査を種々の水準の製鋼スラグ砕石を用いて行い、土質改良効果を確認した。その結果、製鋼スラグ砕石は軟弱土や軟泥土の土質改良に効果があるが、特に多孔質で吸水率が3％以上のもの、または塩基度（CaO/SiO2）が３以上のものが有効であることを確認した。これらは前記した製鋼スラグ砕石による土質を改質するメカニズムのうち、疎水化することによる強度発現、土質中の各種イオン成分のポゾラン反応による強度発現が顕著であるためと考えられる。これに対して緻密質の製鋼スラグ砕石を用いた場合には、粒度改善効果による強度発現にとどまり、疎水化やポゾラン反応が十分に発現されなかったと考えられる。 The present inventors conducted similar investigations using steelmaking slag crushed stone of various levels, and confirmed the effect of soil improvement. As a result, steelmaking slag crushed stone is effective in improving the soil quality of soft soil and soft mud, but it is particularly effective if it is porous and has a water absorption rate of 3% or more, or a basicity (CaO/SiO 2 ) of 3 or more. It was confirmed that It is considered that these are due to the fact that, among the mechanisms by which the soil quality is modified by the steelmaking slag crushed stone, strength development due to hydrophobization and strength development due to the pozzolanic reaction of various ionic components in the soil are remarkable. On the other hand, when dense steelmaking slag crushed stone was used, it is considered that strength was only developed due to the particle size improvement effect, and hydrophobization and pozzolanic reaction were not sufficiently expressed.
図３は、多くの調査の結果得られた製鋼スラグ砕石の吸水率と混合、養生後のCBR値との関係を示すグラフである。吸水率が3％を超えるとCBR値が目標値である20％以上となることが確認された。 FIG. 3 is a graph showing the relationship between the water absorption rate of crushed steelmaking slag and the CBR value after mixing and curing obtained as a result of many investigations. It was confirmed that when the water absorption exceeds 3%, the CBR value reaches the target value of 20% or more.
図４は、SiO２－CaO－Al２O３の三元図であり、比較例と実施例１は塩基度が３よりも小さく、実施例２は塩基度が３を超えていることを示している。実施例２は吸水率が3％を超えるうえ、塩基度も4.6と大きいため、吸水効果及びポゾラン反応による強度発現効果が大きく、最も優れた土質改良効果が発揮された。 FIG. 4 is a ternary diagram of SiO 2 —CaO—Al 2 O 3 , showing that Comparative Example and Example 1 have a basicity less than 3, and Example 2 has a basicity greater than 3. ing. In Example 2, since the water absorption rate exceeded 3% and the basicity was as large as 4.6, the water absorption effect and the strength development effect due to the pozzolanic reaction were large, and the most excellent soil improvement effect was exhibited.
実際の施行現場での混合方法としては、現地での現土（軟弱土や軟泥土）と製鋼スラグ砕石とを別山にそれぞれ仮置きし、パワーショベルのバケットの回数で混合することが好ましい。例えば混合率が１/３の場合には、現土２杯に対して製鋼スラグ砕石を１杯の要領で混合すればよい。なお、土質が強い粘性を呈する軟泥土であるような場合には、混合を促進するため、パワーショベルのバケット内にインペラーを内装した特殊バケットを用いることも可能である。 As a mixing method at the actual construction site, it is preferable to temporarily place the existing soil (soft soil or soft mud) and the crushed steelmaking slag on separate piles and mix them by the number of buckets of a power shovel. For example, when the mixing ratio is 1/3, it suffices to mix 1 cup of steelmaking slag crushed stone with 2 cups of existing soil. If the soil is soft mud with high viscosity, it is possible to use a special bucket with an impeller inside the bucket of the power shovel in order to promote mixing.
一方、量販店の駐車場や港湾周辺のコンテナ・ヤードなどの広範囲の領域を浅層地盤改良する場合には、軟弱土や軟泥土の上部に適量の製鋼スラグ砕石（改良材）を敷き均した後に、スタビライザーと称する表層土混合・撹拌機を用いて両者を一気に混合する工法を用いることができる。この場合にも十分に土質改良効果を得ることができる。例えば、製鋼スラグ砕石の混合率が30％である場合には、現土表層部分を掘り起こした後、スタビライザーの混合深さを1ｍに調整し、スタビライザーにより表層部を混合・撹拌することで、表層部の地盤改良が可能である。なお、施工後約１週間ほど養生することで、改良効果が向上するとともに安定化することができる。 On the other hand, when shallow ground is improved in a wide area such as a parking lot of a mass retailer or a container yard around a port, an appropriate amount of crushed steelmaking slag (improvement material) is laid evenly on top of the soft soil or soft mud. Later, it is possible to use a construction method in which both are mixed at once using a surface soil mixer/agitator called a stabilizer. In this case also, a sufficient soil improvement effect can be obtained. For example, if the mixing ratio of steelmaking slag crushed stone is 30%, after excavating the surface layer of the existing soil, the mixing depth of the stabilizer is adjusted to 1m, and the surface layer is mixed and stirred by the stabilizer to remove the surface layer. It is possible to improve the ground in some areas. In addition, by curing for about one week after construction, the improvement effect can be improved and stabilized.
以上に説明したように、本発明によれば、軟弱な地盤を製鋼スラグ砕石の混合により改良できるため、地盤の土質強度が規定以上となり、地盤改良の効率化と低コスト化が図られる。また、混合時に粉塵を発生させることもなく、作業環境を悪化させるおそれもない。加えて、軟弱な現土の系外搬出費用や良質の客土購入・入替工事費用が不要となり、地盤改良の効率化と低コスト化が図られる。さらに、製鋼工程で副産物として発生する製鋼スラグを軟弱な地盤の施工時に有効活用することができ、従来用途以外の土木用資材として有効利用することができる。このため製鋼スラグの販路拡大が図られ、スラグを最終処分場へ排出する費用も大幅に減少させることができるなど、多くの実用的な利点がある。 As described above, according to the present invention, soft ground can be improved by mixing steelmaking slag crushed stones, so that the soil strength of the ground exceeds the specified level, and the efficiency and cost of ground improvement can be reduced. In addition, no dust is generated during mixing, and there is no risk of worsening the working environment. In addition, there is no need to carry out the soft soil outside the system, or to purchase and replace high-quality soil, making ground improvement more efficient and cost-effective. Furthermore, steelmaking slag, which is produced as a by-product in the steelmaking process, can be effectively used during construction work on soft ground, and can be effectively used as a civil engineering material for purposes other than conventional uses. For this reason, there are many practical advantages, such as the expansion of sales channels for steelmaking slag and the ability to significantly reduce the cost of discharging slag to final disposal sites.
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