JP2935408B2 - Inorganic material for greening and soil stabilization, thick layer base seed spraying method or soil stabilization method using it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic material for greening and soil stabilization and a method for spraying a thick base material seed or a soil stabilization method using the same. When applied to muddy soil, it can be used to apply greening to slopes and other sprayed surfaces, and when applied to muddy soil, the muddy soil can be solidified in a short time with high strength. The present invention relates to a chemical inorganic material.

[0002]

2. Description of the Related Art In order to protect slopes such as cliffs and to green the slopes, recently, a thick-layer base material seed spraying method has been widely applied. This thick-layer base seed spraying method is applied to soil, seeds, curing agents, fertilizers, soil conditioners, accelerators,
A mixture obtained by mixing a soil consolidating agent (glue) at a predetermined ratio is suspended in water to form slurry soil, and the obtained slurry soil is blown onto a slope provided with a lath net, for example. In addition, this method covers the slope with a sprayed surface having a desired thickness.

In the slurry soil sprayed on the slope, the above-mentioned sizing agent contained therein hardens with time, and in the process, the soil particles of the soil are adhered to each other to form soil particles. Agglomeration proceeds. Then, cracks are generated on the sprayed surface in the process of hardening the paste and in the process of agglomerating the soil particles, and the added vegetation material germinates and grows from the cracks.

[0004]

However, the conventional method for spraying a thick base material seed using the above-mentioned slurry soil has the following problems to be solved. That is, first,
In the conventional slurry soil, since the sizing agent for aggregating the soil particles is mainly composed of a resin polymer, the curing speed is low. Therefore, the time required for the slurry soil sprayed on the slope to be completely solidified and fixed on the slope in a stable state becomes longer, and usually a curing time of about 2 to 3 days is required.

[0005] For this reason, if, for example, rain falls after the sprayed slurry is solidified after construction, the entire sprayed surface will run off. If that happens,
Since rebuilding is required at a later date, the overall construction cost increases significantly. Also, in the conventional slurry soil, since the sizing agent is mainly made of a resin polymer, when the sizing agent is completely cured, the surface of the aggregated soil is in a dry state, and has poor water retention and air permeability. As a whole, there is a problem that the germination state of the vegetation material is mottled and its germination rate is reduced. In particular, as the thickness of the sprayed surface increases, the amount of sizing agent to be mixed with the soil increases, so that the surface dryness described above further progresses, and the vegetation material becomes difficult to germinate.

[0006] Further, it is difficult to form a thick sprayed surface in a single time in the conventionally used slurry soil because the curing speed of the sizing agent is low. Depending on the region, only a spray surface with a thickness of about 1 cm can be formed in one day. Therefore, for example, thickness 3cm or 5cm
It takes a long construction time of about 3 to 5 days to form such a sprayed surface, and a longer construction time is required depending on the presence or absence of rain during this time.

[0007] As described above, the conventional spray slurry soil used for the thick layer base material seed spraying method has the above-mentioned problems. In addition to the above, it is customary to further add additives such as a soil stabilizer, an aggregating agent, an erosion inhibitor (adhesive), and a water retention agent. However, the addition of these additives causes an increase in the cost of the slurry soil used, and is not economically preferable.

The present invention solves all the above-mentioned problems in the conventional slurry soil used in the thick-layer base material seed spraying method. Even if it happens and normal rainfall does not run away,
In addition, a spraying surface with a thickness of about 8 cm can be formed in one spraying operation, and the formed spraying surface is porous, rich in air permeability and water retention, and has a high germination rate from the entire spraying surface. The vegetative seeds can be germinated and grown in the soil, and the soil can be made free of frost heave degradation.Furthermore, when mixed with muddy soil, the muddy soil solidifies in a short time and is stable It is an object of the present invention to provide an inorganic material for revegetation and soil stabilization that can be made into a greenery and a method of spraying a thick base material seed or a soil stabilization method using the same.

[0009]

In order to achieve the above-mentioned object, in the present invention, 1 to 20% by weight of aluminum sulfate, 1 to 20% by weight of calcium sulfate, 1% by weight of silica An inorganic material (hereinafter, referred to as a first material) for greening and soil stabilization, comprising 10 to 50 parts by weight of an additive composed of 10 to 80% by weight of a cement component and 10 to 80% by weight of a cement component. You.

In the present invention, 1 to 20% by weight of aluminum sulfate, 1 to 20% by weight of calcium sulfate, 1 to 20% by weight of silica powder, and 10 to 80% by weight of cement component are added to 100 parts by weight of ash component. Additive consisting of 10 to 50
The present invention provides an inorganic material for greening and soil stabilization (hereinafter, referred to as a second material), wherein the inorganic material is a mixture of at most 10 parts by weight of the ceramic powder and at most 10 parts by weight of the ceramic powder.

Further, in the present invention, a slurry-like soil is prepared by mixing the soil with the first material or the second material and water, and the soil is sprayed on the surface of the ground. A layer base seed spraying method and a soil stabilization method characterized by mixing, stirring and compacting the muddy soil and the first material or the second material described above are provided. When the first material and the second material of the present invention are both dispersed in water to form a slurry, the slurry exhibits thixotropic properties. That is, when the slurry is agitated and stressed in the tank, good fluidity is exhibited.For example, when sprayed on a slope, fluidity is lost at the moment of contact with the slope, and the fluidity is reduced. It has the property of adhering to the slope.

The first material of the present invention comprises an ash component described later and an additive.
Agent is required, and the second material is further added to the first material.
It is constituted by blending the ceramic powder described above. 1st material
In both the raw material and the second material, the ash component is Si
O_Two, Al_TwoO _ThreePoso containing CaO and CaO as main components
A orchid substance that has hydration activity and reacts with water
A powder of a hydraulic substance that converts to a hydrate is used.

Specific examples include fly ash, incineration ash of papermaking sludge, blast furnace slag, and the like. Of these, fly ash is JIS
Fly ash specified in A6201 is easy to obtain,
Further, it is preferable because the material cost can be reduced, and as the incineration ash of the papermaking sludge, the incineration ash of the papermaking sludge obtained without using a chlorine bleach in the papermaking process is Mg.
It is suitable because it contains an O component and the leaves of vegetation that germinates and grows from the spray surface by the action of MgO become green.

The ash component disperses colloidally in water at the time of preparing the slurry, and at the same time, causes a hydration reaction with coexisting water. At least a surface portion of the ash component includes ettringite and calcium silicate hydrate. It rapidly converts to mineral hydrate and hardens. If the soil coexists in this slurry, the hydrated compound of the above-mentioned minerals is generated in a state in which the soil particles themselves are scattered, so that, eventually, a large number of soil particles and the hydrated compound Are formed into porous aggregates having a composite structure. Then, in the process of forming the above-mentioned porous aggregates, the moisture in the soil is rapidly absorbed by the porous aggregates, and the hardening of the ash component itself progresses.

Therefore, unlike the conventional aggregated state in which soil particles are adhered to each other with a sizing agent, the formed aggregates are porous and absorb water in the soil therein. As a result, the air permeability and water retention are good, and the elasticity is high. Next, the first material of the present invention, the second material
In the material, additives to be blended are aluminum sulfate,
It consists of calcium sulfate, silica powder and cement as essential components.

Aluminum sulfate is dissolved in water when the material of the present invention is dispersed in water to form a slurry, functions as an electrolyte, and forms ettringite with the ash component dispersed in a colloidal state. Promotes its aggregation. When soil coexists, polycondensation ions of aluminum are formed as a polymer in the process of forming aluminum hydroxide through hydrolysis, and this condenses while spreading the soil particles.

The ratio of the aluminum sulfate is set to 1 to 20% by weight based on the total amount of the additive. When this ratio is less than 1% by weight, the effect of coagulating ash components and the effect of forming ettringite are reduced, so that the soil cannot be rapidly stabilized or water in the soil cannot be effectively absorbed.
If the amount is more than the weight%, the effect of the compounding only reaches saturation and the cost is increased.

As in the case of aluminum sulfate, calcium sulfate dissolves in water when the slurry is prepared and dissociates, causing aggregation of the ash component, and reacting with the ash component to cause ettringite or calcium silicate. Produces hydrate. The ratio of the calcium sulfate is set to 1 to 20% by weight based on the total amount of the additive. This ratio is 1% by weight
When the amount is less than the above, the above-mentioned effects are not sufficiently exerted. On the contrary, when the amount is more than 20% by weight, the prepared slurry starts to gypsum and becomes hard because the calcium sulfate itself is a gypsum component. Is difficult to perform.

When the material of the present invention is agglomerated and solidified, the silica powder is dispersed in the agglomerates and contributes to maintaining strength. Although the silica powder to be used is not particularly limited, for example, fumed silica or natural shirasu can be preferably used. In particular, since fumed silica is amorphous, it is useful because it can be combined with an ash component and a cement component described later to increase the strength of aggregates while vigorously crystallizing simultaneously with the preparation of the slurry.

The proportion of the silica powder is set to 1 to 20% by weight based on the total amount of the additives. This ratio is 1% by weight
If the amount is less than the above, the above-mentioned strength improving effect is not sufficiently exhibited, and if the amount is more than 20% by weight, the compounding effect reaches saturation and the cost is increased. When the prepared slurry soil is sprayed on, for example, a slope, the cement component is blended in order to solidify the slurry soil in a short time and to secure the strength of the spray surface.

The cement component is not particularly limited, and for example, Portland cement and early-strength cement used as a construction material for emergency construction are suitable. The ratio of the cement component is set to 10 to 80% by weight based on the total amount of the additive. If the proportion is less than 10% by weight, the above-mentioned effects are not sufficiently exhibited. Conversely, if the proportion is more than 80% by weight, the slurry after the construction is excessively condensed, resulting in a very hard construction surface, This is because, for example, when a vegetation material is added, the germination and growth of the vegetation material are hindered.

The first material and the second material of the present invention each contain the additive in an amount of 10 to 50 parts by weight based on 100 parts by weight of the ash component.
It is made by mixing parts by weight. If the mixing ratio of the additive is less than 10 parts by weight, the prepared slurry does not rapidly agglomerate and solidify. The soil becomes too hard. In any case, it is unsatisfactory as a greening spray material or a stabilizing material for muddy soil, in which the vegetation material does not run off from the rainwater, does not cause frost heave deterioration, and germinates and grows evenly from the sprayed surface.

In the second material, ceramic powder is further blended as an essential component with the first material. Although the ceramic powder itself does not participate in the hydration reaction and the formation of porous aggregates described above, since these ceramic powders are aggregates of porous particles, they are dispersed in the formed aggregates. Thereby, the water permeability and water retention of the aggregates are enhanced, and the seed vigor is enhanced. Furthermore, it plays a role in ensuring the long-term effectiveness of the fertilizer added to the soil and creating an extremely favorable environment for growing vegetation. In addition, since the above-mentioned effects are exhibited even with a very small amount of compounding, it contributes to cost reduction of products.

The ceramic powder is not particularly limited, but, for example, FB material (trade name) manufactured by Filton International Co., Ltd. is suitable. The amount of the ceramic powder is set to 10 parts by weight or less based on 100 parts by weight of the ash component. If the compounding amount is more than 10 parts by weight, rapid aggregation and solidification of the slurry after the application is difficult to occur, and the strength of the aggregate itself starts to decrease, and the cost is increased.

The method of spraying the thick base material seed according to the present invention is performed as follows. First, water,
After adding a soil, a seed, a fertilizer, a fertilizer, a soil conditioner, a promoter, and the like, the mixture is stirred, and the material of the present invention is further charged therein. At this time, the amount of injected water and the amount of soil are appropriately adjusted so as to have a viscosity suitable for spraying construction. Then, the whole is sufficiently agitated to obtain spray slurry.

The obtained slurry soil is sprayed onto a predetermined ground surface, for example, a slope, and adhered to the surface, thereby completing the construction. At the same time as spraying, the soil loses fluidity and adheres firmly to the ground surface,
In addition, the agglomeration of the soil rapidly progresses and the whole solidifies with elasticity. Next, in the soil stabilization method of the present invention,
Mix the target muddy soil with a predetermined amount of the material of the present invention.
Stirring and rolling may be performed.

Due to the hydration reaction of the material, the water in the muddy soil is rapidly absorbed, while the agglomerated and solidified muddy soil progresses to increase the strength. As a result, the muddy soil is stabilized in a short time.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Example 1 1.6 kg of aluminum sulfate (manufactured by Nippon Light Metal Co., Ltd.), 1.6 kg of calcium sulfate (manufactured by Kokusai Shoji Co., Ltd.), 1.6 kg of fumed silica (manufactured by Nichito Nichito Co., Ltd.), and early-strength cement ( Sumitomo Cement Co., Ltd.) 11.2kg mixed, the total amount is 16kg
Was prepared. Then, the additive was uniformly mixed with 64 kg of sludge ash (manufactured by Shin-Oji Paper Co., Ltd.) to produce 80 kg of the first material of the present invention.

Into a tank having a capacity of 3800 l, water, soil, seeds, a curing agent, and fertilizer were charged and stirred, and 80 kg of the above-mentioned first material was charged and stirred to prepare slurry soil. This slurry soil is inclined at an angle of about 30 ° and an area of about 80.
It was sprayed on the slope of m ^2. The construction work was carried out in the midst of light rain, but the clinging effect of the agglomeration and the immediate effect were exhibited, and the work was completed without losing the soil.

After the construction work, there was considerable rainfall from the middle of the night, but on the next day, the sprayed surface was observed. For comparison, construction using conventional slurry soil was also performed, but on the sprayed surface, the soil was washed away and the lath net was completely exposed. Observation of the sprayed surface four weeks after the construction showed that the sprouted seeds were evenly germinated from the sprayed surface and that the soil was in the same state as at the time of spraying. However, conventionally, the sprayed surface of the soil was germination from cracks, and the germination state was mottled.

When the sprayed surface was observed after one winter, the grown leaves were dense and there was no loss of soil.
The condition was the same as when spraying. Example 2 The slurry soil used in Example 1 was sprayed at the waterfront of Sapporo Moiwa Dam where exposure and submersion were repeated at high and low water levels. Spray area 16m ² . The next day, the water level of the dam rose and covered the spray surface, but the soil was not washed away and remained in the same condition as at the time of spraying.

Example 3 A part of the Ishikari River embankment which was muddy due to long rain was fractionated and selected as a test site. The test location has a tilt angle of about 30 °
The width was 100 m and the height was about 8 m, so that the worker could not climb. Example 1 was placed on the soil at this test site.
The first material used in the above was sprayed so as to be 2% by weight with respect to the slope soil, and the whole was uniformly stirred and pressed with a yumbo. During the agitation, the test area is ready for workers to climb, and after 1 hour from the agitation, a 15-ton bulldozer is run. Stabilized as much as possible.

Immediately thereafter, when the surface of the test site was turfed, the turfing work proceeded smoothly. The turf was well rooted, and no lands were washed away due to rainfall. Example 4 When a rainfall flows, a swamp flows, and the swamp that the slope becomes sludge-like and flows away is selected as a construction site, and road construction is performed there.

The sludge that had flowed out was collected, the above-mentioned first material was charged therein, the whole was stirred, and then the sludge after the treatment was returned to the slope and rolled. After the construction, the slopes were stabilized to the extent that they would not be washed away even if it rained, and the vegetation grew densely. Example 5 An FB agent (trade name, manufactured by Filton International Co., Ltd.) was further added to 80 kg of the first material prepared in Example 1.
3.2 kg was charged and stirred to prepare 100 kg of the second material of the present invention.

Into a tank having a capacity of 1200 l, water, soil, seeds, a curing agent and fertilizer were charged and stirred, and 30 kg of the above-mentioned second material was further charged and stirred to prepare slurry soil. This slurry soil was sprayed onto a slope having an inclination angle of about 25 ° so as to have a thickness of 1 cm or 3 cm. As in the case of the first embodiment, even if there is rainfall, no erosion of the land is observed,
The germination state was also good.

The water retention on the sprayed surface was better than that in Example 1.

[0037]

As is apparent from the above description, claim 1
The material for greening and soil stabilization does not run off by ordinary rainfall after about one hour has elapsed after spraying.
In addition, if the inclined surface is a normal inclined surface of about 35 °, it is possible to spray the thick-layer base material seed without using a lath net or a net. Furthermore, since frost heave deterioration does not occur, greening can be sprayed in a cold region.

[0038] For muddy muddy soil,
It can be solidified and stabilized in a short time. In addition, since it does not run away with water, it is possible to spray and transplant aqueous plants to the shores of lakes and marshes and water parks, thereby contributing to environmental purification and environmental conservation. In the material of the present invention, a hydrated compound is formed by a hydration reaction between the constituent components, and this rapidly forms porous aggregates having soil particles as nuclei. It is possible to provide a very favorable environment for the germination and growth of the added vegetation material.

Further, since the ceramic powder, which is an aggregate of porous particles, is further blended in the material of claim 2, the water retention and water permeability are further improved, and the seeds are more excellent in rooting property. The effects of fertilizers and the like can be secured over a long period of time.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-200249 (JP, A) JP-A-4-221116 (JP, A) JP-A-5-239459 (JP, A) JP-A-61- 117148 (JP, A) JP-A-6-165617 (JP, A) JP-A-4-15288 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C09K 17/02-17 / 50 C04B 28/02 C05G 3/04

Claims (7)

(57) [Claims] 1. 1 to 20% by weight of aluminum sulfate, 1 to 20% by weight of calcium sulfate, 1 to 20% by weight of silica powder, 10 to 8% by weight of cement component, based on 100 parts by weight of ash component
An inorganic material for greening and soil stabilization, comprising 10 to 50 parts by weight of an additive consisting of 0% by weight. 2. 100 parts by weight of ash component, 1 to 20% by weight of aluminum sulfate, 1 to 20% by weight of calcium sulfate, 1 to 20% by weight of silica powder, 10 to 8% of cement component
An inorganic material for greening and soil stabilization, comprising 10 to 50 parts by weight of an additive consisting of 0% by weight and 10 parts by weight or less of ceramic powder. 3. The inorganic material for greening and soil stabilization according to claim 1, wherein the ash component is incinerated ash of fly ash or papermaking sludge. 4. The inorganic material for greening and soil stabilization according to claim 1, wherein said silica powder is fumed silica. 5. The inorganic material for greening and soil stabilization according to claim 2, wherein the ceramic powder is a FB material (trade name, manufactured by Filton International Co., Ltd.). 6. A slurry-like soil is prepared by mixing the soil, the inorganic material according to claim 1 or 2 with vegetation seeds or plant rhizomes, and water, and the soil is sprayed on the ground surface. Thick base material seed spraying method. 7. A soil stabilization method comprising mixing and stirring muddy soil and the inorganic material according to claim 1 or 2.