Ground improvement method and manufacturing equipment for ground improvement materials

Abstract

The objective is to provide a ground improvement method used to improve the properties of land such as grounds and open spaces, which is cost-effective and environmentally friendly, as well as a manufacturing device for the ground improvement materials used in that method. [Solution] The ground improvement material manufacturing apparatus according to the present invention comprises a temporary receiving device 20 having a first region 20A into which a first raw material soil 31 containing one or more of crushed stone, decomposed granite, and soil material is introduced; a second region 20B into which a second raw material soil 32 containing one or more of crushed stone, decomposed granite, and soil material of a different type from the first raw material soil 31 is introduced; a partition plate 21 separating the first region 20A and the second region 20B, the partition plate 21 having an opening gate 22 with an adjustable opening area; a solidification material supply means for supplying a solidification material; a water supply means for supplying an aggregation agent and water; and a mixing means for mixing the first raw material soil 31, the second raw material soil 32, the solidification material, the aggregation agent, and water.

Description

Technical Field

[0001] The present invention relates to a ground improvement method used when improving the properties of land such as grounds, plazas, garden paths, and promenades, and a manufacturing apparatus for a ground improvement material used therein.

Background Art

[0002] Conventionally, various proposals have been made regarding techniques for improving the properties of land such as grounds and plazas (for example, Patent Documents 1 to 4).

[0003] The ground improvement method described in Patent Document 1 uses a ground improvement material containing one or more of crushed stone, natural sand, and soil materials, a cement-based solidifying material, an aggregating agent, and water. Further, the soil improvement method described in Patent Document 2 adds clay to the soil of the ground to be improved and mixes it to form aggregated suitable soil and sand, and adds and mixes a solidifying material, an aqueous solution containing a polymer compound having an aggregating action, and water to the aggregated suitable soil and sand to form improved soil and sand. The civil engineering material described in Patent Document 3 contains soil and sand or sandy soil, any one or more of a cement-based solidifying material, a lime-based solidifying material, and a gypsum-based solidifying material, a polymer compound having an aggregating action, and moisture, and the moisture content is within the range of 5% by mass to 15% by mass. On the other hand, the improved soil used in the soil improvement method described in Patent Document 4 also contains soil and sand or sandy soil, a solidifying material, a polymer compound having an aggregating action, and moisture, and the moisture content is within the range of 5% by mass to 10% by mass.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

[0005] Each of the construction methods described in Patent Documents 1 to 4 can achieve particularly remarkable effects, such as forming a granular structure in soil and improving the permeability and water retention of the land. However, in recent years, there has been a demand for methods that not only guarantee such effects (quality) but also reduce costs and are environmentally conscious.

[0006] Therefore, the present invention aims to provide a ground improvement method that is cost-effective and environmentally friendly, and is used when improving the properties of land such as grounds, plazas, garden paths, and walking paths, as well as a manufacturing apparatus for the ground improvement material used in that process. [Means for solving the problem]

[0007] The ground improvement method according to the present invention includes a step of manufacturing a ground improvement material by mixing a first raw material soil containing one or more of crushed stone, decomposed granite, and soil material; a second raw material soil containing one or more of crushed stone, decomposed granite, and soil material of a different type from the first raw material soil; a solidifying agent; an aggregation agent; and water.

[0008] This process produces a ground improvement material that is a mixture of a first raw material soil containing one or more of crushed stone, decomposed granite, and soil material, a second raw material soil different from the first raw material soil, a solidifying agent, an aggregation agent, and water.

[0009] Here, it is preferable that the necessary amount of soil aggregate and water is supplied according to the mixing ratio and / or amount of the first raw soil and the second raw soil. Furthermore, it is preferable that the first raw material soil is suitable for aggregation (soil that can be aggregated), and the second raw material soil is unsuitable for aggregation (soil that is not suitable for aggregation).

[0010] On the other hand, the ground improvement material manufacturing apparatus according to the present invention comprises a first area into which a first raw material soil containing one or more of crushed stone, decomposed granite, and soil material is introduced; a second area into which a second raw material soil of a different type from the first raw material soil is introduced, which contains one or more of crushed stone, decomposed granite, and soil material; a partition plate separating the first area and the second area, the partition plate having an opening gate with an adjustable opening area; a solidification material supply means for supplying a solidification material; a water supply means for supplying an aggregation agent and water; and a mixing means for mixing the first raw material soil, the second raw material soil, the solidification material, the aggregation agent, and water.

[0011] As a result, a first raw material soil containing one or more of crushed stone, decomposed granite, and soil material is introduced into the first region of the temporary receiving device, and a second raw material soil different from the first raw material soil is introduced into the second region. The amount of mixing is appropriately adjusted by the opening gate, and these are further mixed with a solidifying agent supplied by a solidifying agent supply means and a watering means, along with a granulating agent and water, by a mixing means to produce a ground improvement material.

[0012] In this case, the watering means preferably supplies the necessary amount of aggregater and water according to the mixing ratio and / or mixing amount of the first raw material soil and the second raw material soil. Furthermore, it is preferable that the first raw material soil is suitable for aggregation (soil that can be aggregated), and the second raw material soil is unsuitable for aggregation (soil that is not suitable for aggregation). [Effects of the Invention]

[0013] The ground improvement method according to the present invention produces a ground improvement material by mixing a first raw material soil containing one or more of crushed stone, decomposed granite, and soil material, a second raw material soil different from the first raw material soil, a solidifying agent, an aggregation agent, and water. As a result, the permeability and water retention of the land (ground) constructed using this material can be improved. Furthermore, in addition to the first raw material soil that is normally used in the methods described in Patent Documents 1 to 4, a second raw material soil can be used for ground improvement. For example, discarded soil can be used as the second raw material soil, which can result in cost reduction and contribute to environmental protection. In addition, according to the ground improvement material manufacturing apparatus according to the present invention, a ground improvement material used in the ground improvement method according to the present invention can be manufactured.

Brief Description of the Drawings

[0014] [Figure 1] It is a schematic diagram showing a ground improvement method according to an embodiment of the present invention. [Figure 2] It is a diagram for explaining one step of the ground improvement method. [Figure 3] It is a diagram for explaining the ground improvement material manufacturing apparatus according to an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3. However, the description of the constituent elements described below is an example (representative example) of the embodiments of the present invention, and the present invention is not limited to the following content as long as it does not deviate from the gist thereof.

[0016] [Ground Improvement Method] First, the ground improvement method will be described. The ground improvement method according to the embodiment of the present invention manufactures a ground improvement material 90 (see FIG. 1(c)) using a self-propelled soil improvement machine 10 (see FIG. 1(b)). The self-propelled soil improvement machine 10 is, for example, a Litera (registered trademark) of Komatsu Ltd. In this description, the ground improvement material 90 is the tose soil in the ATTAC method.

[0017] The self-propelled soil improvement machine 10 is supplied with a first raw material soil containing one or more of crushed stone, natural sand, and soil material, a second raw material soil containing one or more of crushed stone, natural sand, and soil material and being of a different type from the first raw material soil, a solidifying agent, an agglomerating agent, and water. Specifically, these can be combined as shown below. [1] First raw material soil: single-particle structure material [2] Second raw material soil: viscous material [3] Solidifying agent: Toughlock cement [4] Granulating agent and water: GB-2000 diluted with water

[0018] Here, the ratio of the first raw soil to the second raw soil is "1:1". Also, "GB-2000" is the name of a product of "Global Research Institute Co., Ltd.", and it is a chemical agent composed of a complex of a magnesium salt of a dimethylaminoethyl acrylate-methacrylic acid copolymer and polyethyleneimine, containing a polymer compound.

[0019] Also, in this embodiment, the first raw soil is supplied by the backhoe 81 from the place where the self-propelled soil improvement machine 10 is located (see FIGS. 1(a) and (b)), but the supply means is not particularly limited, such as transporting and supplying the soil taken from other places. Similarly, the second raw soil is not particularly limited in the supply means. At this time, the first raw soil and the second raw soil are supplied to the temporary receiving device (hopper) 20 of the ground improvement material manufacturing device provided in the self-propelled soil improvement machine 10 (see FIG. 3).

[0020] On the other hand, the solidifying agent is supplied from the solidifying agent supply means. In this embodiment, the solidifying agent is supplied from the tank (solidifying agent tank) 11 provided in the self-propelled soil improvement machine 10 (see FIG. 1(b)).

[0021] Also, in this embodiment, the granulating agent and water are supplied by the water addition means composed of the water addition device 12 connected to the self-propelled soil improvement machine 10 by a hose and the watering truck 83 (see FIG. 1(b)). In the water addition means in this embodiment, after the water for diluting the granulating agent (GB-2000) is supplied from the watering truck 83 to the water addition device 12, the necessary amount is sprayed (supplied) from the water addition device 12 to the self-propelled soil improvement machine 10 (the first raw soil, etc.) using a flow meter (not shown). The necessary amount is appropriately determined according to the mixing ratio and / or mixing amount of the first raw soil and the second raw soil.

[0022] Figure 2 shows the process in which raw soil 30 is supplied to the self-propelled soil improvement machine 10 by a backhoe 81. When manufacturing ground improvement material using a self-propelled soil improvement machine, a method is generally used in which two types of materials, a certain raw soil and a solidifying agent, are mixed.

[0023] In contrast, the ground improvement method according to this embodiment, as described above, manufactures a ground improvement material by mixing (stirring) four components: a first raw material soil, a second raw material soil, a solidifying agent, a granulating agent, and water. The manufacturing apparatus for the ground improvement material according to this embodiment, used for mixing these four components, will be described later.

[0024] The ground improvement material 90 produced by the self-propelled soil improvement machine 10 is then transported by a dump truck 82 to the construction site, such as a ground or open field (see Figure 1(c)).

[0025] The ground improvement method described above is merely an example, and the ratio of the first raw material soil (single-grain structural material) to the second raw material soil (cohesive material) is not limited to the example given (1:1), nor is the combination of the first and second raw material soils limited to this example.

[0026] For example, it is preferable that the first raw material soil is suitable for aggregation (soil that can be aggregated), and the second raw material soil is unsuitable for aggregation (soil that is not suitable for aggregation). Specifically, the second raw material soil can be "Kurikara sand" or "Shirasu". Since these are unsuitable for aggregation, simply mixing them with a solidifying agent, an aggregation agent, and water will not produce toast soil. However, by using them as the second raw material soil in the ground improvement method according to the present invention, they can be used as a ground improvement material when improving the properties of land such as grounds and open spaces (they can be used as industrial materials), thus enabling cost reduction and other improvements.

[0027] To explain in more detail, as the clayey material (clay soil) used as the second raw material, discarded field soil can also be used. If 10,000m 3 If we were to dispose of the field soil, the transportation cost would be 1,000 yen / m3 Even assuming it takes a reasonable amount of time, the cost would be 10 million yen. Furthermore, there would be additional costs for disposing of the field soil (more than the transportation costs). Therefore, it is clear that by using the ground improvement method according to the present invention, or by manufacturing and implementing the manufacturing equipment for the ground improvement material according to the present invention, such transportation and disposal costs can be reduced, thus achieving lower costs. Moreover, since it reuses field soil that would otherwise be discarded, it can be said to be environmentally friendly.

[0028] [Equipment for manufacturing ground improvement materials] Next, a manufacturing apparatus for ground improvement materials will be described. The manufacturing apparatus for ground improvement materials according to the embodiment of the present invention is installed on a self-propelled soil improvement machine 10, and may be integrated with the self-propelled soil improvement machine 10 in whole or in part, or may be detachable in whole or in part.

[0029] The ground improvement material manufacturing apparatus according to this embodiment includes a temporary receiving device 20, a solidification material supply means, a water adding means, and a mixing means (see Figures 1 and 3).

[0030] Here, Figure 3(a) shows the overall configuration of the temporary receiving device 20, which has a first region 20A into which the first raw material soil is introduced, a second region 20B into which the second raw material soil is introduced, and a partition plate 21 that separates the first region 20A and the second region 20B. Therefore, as shown in Figure 3(c), the first raw material soil 31 is supplied to the first region 20A of the temporary receiving device 20, and the second raw material soil 32 is supplied to the second region 20B by a backhoe 81 or the like.

[0031] Furthermore, the partition plate 21 of the temporary receiving device 20 is provided with an opening gate 22 whose opening area (opening height) can be adjusted (see Figure 3(b)). Therefore, by adjusting the opening area of ​​this opening gate 22, the amount of the first raw soil 31 and the second raw soil 32 supplied to the self-propelled soil improvement machine 10 can be adjusted as desired. The mechanism of the opening gate 22 allows for manual adjustment of the opening area or automatic (remote control) adjustment of the opening area.

[0032] On the other hand, the solidification material supply means according to this embodiment is a tank 11 as described above, but of course it is not limited to the example configuration. Also, the water supply means according to this embodiment consists of a water supply device 12 and a watering vehicle 83 as described above, but this too is not limited to the example configuration. Although the mixing means is not shown, it can be any means that can sufficiently mix the first raw material soil, the second raw material soil, the solidification material, the granulation agent and water, and prior art such as the techniques described in Patent Documents 1 to 4 can be used.

[0033] The ground improvement material manufacturing apparatus according to this embodiment can simultaneously mix four components: a first raw material soil, a second raw material soil, a solidifying agent, an aggregation agent, and water.

[0034] Furthermore, the ground improvement material produced by this manufacturing apparatus can form a granular structure in the soil and improve the permeability and water retention of the land. However, the particle size of the base material (raw soil) used to form the granular structure is important.

[0035] Specifically, the National Toss Technology Research Association, which is responsible for quality control of the ATTAC construction method, compares the particle size distribution of the base material (raw soil) and improved soil (ground improvement material) used, as shown in the reference materials below, and conducts tests to determine whether the entire structure is aggregated. (Reference material) https: / / attac-j.or.jp / technology

[0036] In this regard, by using the ground improvement material manufacturing apparatus according to this embodiment, the amount of the first raw material soil and the second raw material soil 32 used as the base material can be arbitrarily adjusted by the temporary receiving device 20, so particle size adjustment can also be easily performed. [Industrial applicability]

[0037] This invention relates to a ground improvement method used to improve the properties of land such as grounds, plazas, garden paths, and walking paths, which is cost-effective and environmentally friendly. It also relates to a manufacturing apparatus for the ground improvement material used in this method, and is industrially useful because it can be widely used in construction at various sites. [Explanation of Symbols]

[0038] 10 Self-propelled soil conditioner 11. Tank (Solidifying agent tank) 12 Water adding device 20 Temporary receiving device (hopper) 20A First area 20B Second Area 21 Partition Plates 22 Opening Gate 30 Raw material soil 31. First raw material soil 32 Second raw material soil 81 Backhoe 82 Dump Trucks 83 Watering truck 90. Ground improvement material (Toast soil)

Claims

1. A first raw material soil containing one or more of crushed stone, decomposed granite, and soil materials, A second raw material soil that is different in type from the first raw material soil, and includes one or more of crushed stone, decomposed granite, and soil materials. Solidifying agent, A ground improvement method that includes a step of mixing a granulation agent and water to produce a ground improvement material.

2. The ground improvement method according to claim 1, wherein the granulating agent and the water are supplied in the necessary amounts according to the mixing ratio and / or mixing amount of the first raw material soil and the second raw material soil.

3. The first raw material soil is a soil suitable for aggregation, The ground improvement method according to claim 1 or 2, wherein the second raw material soil is soil unsuitable for granulation.

4. A first area into which a first raw material soil containing one or more of crushed stone, decomposed granite, and soil materials is introduced, A second area into which a second raw material soil of a different type from the first raw material soil is introduced, which includes one or more of crushed stone, decomposed granite, and soil materials. A partition plate separating the first region and the second region, the partition plate being provided with an opening gate whose opening area can be adjusted, A temporary support device having, A means for supplying a solidifying agent, A means for supplying a granulating agent and water, A manufacturing apparatus for ground improvement material, comprising a mixing means for mixing the first raw material soil, the second raw material soil, the solidifying agent, the granulating agent, and the water.

5. The apparatus for manufacturing a ground improvement material according to claim 4, wherein the water-adding means supplies the necessary amount of the granulating agent and the water according to the mixing ratio and / or mixing amount of the first raw material soil and the second raw material soil.

6. The first raw material soil is a soil suitable for aggregation, The apparatus for manufacturing a ground improvement material according to claim 4 or 5, wherein the second raw material soil is soil unsuitable for granulation.

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