JP3491985B2 - Multi-layer construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a vegetation base for an inclined surface in civil engineering work. For details, on the slopes (also called slopes) that have been left bare due to disasters or development work, etc. It is related to the construction method of creating a mulch (mulch root covering) layer in a shape close to the topsoil.

[0002]

2. Description of the Related Art The inventor of the present invention has previously filed an application according to Japanese Patent Application No. 4-77772 for the same purpose in the same industrial application field as this method.

In the prior application, a multi-material slurry (slur) prepared by mixing an aqueous solution mixed with a mulch material or a multi-material and a water-insoluble hydrated (hydrated) gel material
ry) liquid is mixed with an aqueous solution of a curing agent prepared by mixing a curing agent suitable for the water-insoluble water-containing gel material, and the mixture is sprayed on the plant growth base construction surface to form a multi-layer.
The action and effect of the invention of this prior application is that a water-insoluble water-containing gel material, water glass or silica sol (silica sol) is mixed as a stabilizer into an aqueous solution in which a mulch material is mixed, and an aqueous bicarbonate solution which is a curing agent is mixed therein. By adding and spraying it, the multi-material slurry liquid becomes a plastic material with a non-fluidized water-containing (hydrated) gelled substance, and thickly adheres to the slope. It is said that the mulch material is fixed by a binder (binder) and is stable in a three-dimensional structure, and a layer with excellent mulching effect, which is rich in heat retention and water retention, is formed.

Certainly, according to the method of the prior application, a multi-layer as described in the detailed description is formed, but some drawbacks are recognized when actually applying the method of the prior application. .

First of all, one of the points is that it takes a considerable number of days for the water encapsulation gelled product to release water to shrink and solidify, and during that time, the multi-material cannot form a three-dimensional structure. Is not fully exerted.

The second point is that it is necessary to use a large amount of water glass or silica sol used as a water encapsulating gelling agent (stabilizer), which results in high cost and is unrealistic.

[0007]

Generally, materials used as a mulch material are cut into pieces such as paper, cut pieces such as plastic films, rice straw, defoliation, bark and other dead plants, and then formed into chips or fibers. All of them are light in weight.

[0008] When this mulch material having a low specific gravity is mixed with water and sprayed with a pump, it is easy to separate from water, and therefore it is difficult to send the mulch material in a state of being uniformly mixed with water. The separated multi-material tends to block the inside of the pump and the hose.

Further, it is excellent in workability to employ a slurry pump having a large liquid feeding amount in order to obtain a flight distance from the nozzle, but in this case, a large amount of water is required to feed the multi-material under pressure. However, since the mulch material mixed with the sprayed water also flows down, there is a problem in terms of adhesion stability.

In view of the above circumstances, in the present invention, a treatment method for preventing the inside of the pump and the hose from being blocked by the multi-material having a low specific gravity and a method for preventing the flow-down of a large amount of water are further determined. The purpose of this method is to make the mulch material exhibit a mulch effect in a three-dimensional structure immediately after spraying, and to stabilize it efficiently and thickly on a steep slope by a method that can be constructed at low cost.

[0011]

In order to achieve the above object, in the present invention, a multi-material slurry liquid in which water and a super absorbent polymer (Polymer polymer) are mixed with the multi-material is pumped by a pump. Provided is a method for forming a multi-layer characterized by forming a multi-layer by spraying on a construction surface for constructing a growth base of a plant while being mixed with a cationic polymer flocculant polyacrylamide-based polymer aqueous solution when spraying. .

A binder may be mixed with the multi-material slurry liquid. In that case, it is preferable to mix the anionic polymer flocculant polyacrylamide-based polymer adapted to the multi-material slurry liquid in order to cause the binder to adhere to the multi-material and the like to enhance the binder effect.

[0013]

[Function] When a cationic polymer flocculant polyacrylamide polymer aqueous solution is mixed with a slurry liquid in which water, a super absorbent polymer and a mulch material are mixed and sprayed onto an inclined surface with a spray nozzle, the maximum amount of water is obtained. The superabsorbent polymer that has absorbed water, gelled, and floated in water to maintain a slurry state aggregates together with the multi-material, separates water, and becomes a plastic material that adheres thickly to the slope.

The gelled product of the highly water-absorbent polymer that has absorbed water is discharged into the original form and shrinks to its original form and contracts to about 1/1000 of the maximum water absorption and solidifies. Further, when the binder is mixed, the mulch material is fixed before the gelled product of the superabsorbent polymer is contracted by the binder, and a layer having a stable three-dimensional structure and an excellent mulching effect is formed.

[0015]

EXAMPLE FIG. 1 shows a schematic cross-sectional view of a sloping ground in which a multi-layer 6 is formed. In the present invention, as the multi-material 61 for forming the above-mentioned multi-layer 6, the same paper as the previous application, cutting pieces such as plastic film, rice straw, deciduous leaves, bark and other dead plants are corroded. Alternatively, a growth base (vegetation base) in which these multi-materials 61 are first formed by using chips or fibrous materials that are crushed in a raw state
4 to the upper layer to stabilize the adhesion.

In the figure, reference numeral 1 denotes the bottom ground, which is made of rock or hard soil, and 4 is a method for spraying a thick layer of vegetation base material on the slope 2 (the method disclosed in JP-A-1-310019). Etc.), a single-structured growth base, in which plant seeds 41 and fertilizer 42 are included. Reference numeral 5 denotes a slope (slope) of the growth base 4, on which a multi-layer 6 according to the present invention is formed, in which the various multi-materials 61 described above and a water encapsulation gelation product 62 of a super absorbent polymer described below are formed. Included. 7 is a binder.

When the natural ground 1 shown in FIG. 1 is earth and sand with good vegetation conditions, it is not necessary to form the growth base 4 by the thick-layered vegetation base material spraying method. In some cases, a seed spraying method is used in which only the seeds are sprayed and a multi-layer is sprayed on top. FIG. 2 shows a schematic sectional view of the sloping ground in this case.

FIG. 3 shows a state of the multi-layer 6 shown in FIG. 1 when it changes with time. The water encapsulating gelation product 62 of the superabsorbent polymer used as a stabilizer releases water and the superabsorbent polymer is solid after being discharged. It is a thing 63. As shown in the figure, the superabsorbent polymer releases water over time to shrink and solidify.

As the super absorbent polymer, starch-polyacrylate polymer or polyacrylate polymer (product name: Sunfresh ST-500D, Sanyo Chemical Co., Ltd.) is used.

As the binder, an anionic asphalt emulsion (product name; FL coat, Showa Shell Petroleum Product) is used. The above materials were mixed with water to obtain a multi-material slurry liquid 9 (see FIG. 4).

Next, as a material for plasticizing the multi-material slurry liquid 9, a cationic polymer flocculant polyacrylamide polymer (product name: Sunfloc C-0
09P Sanyo Kasei product) is used. The superabsorbent polymer is rapidly aggregated by the cationic polymer flocculant, but the asphalt emulsion mixed as the binder 7 is dehydrated together with the separated water and is difficult to aggregate, and the binder effect for fixing the multi-material 61 is obtained. Is reduced.

Therefore, the asphalt solid content of the asphalt emulsion mixed as the binder mixed in the multi-material slurry liquid 9 is also a super absorbent polymer and the multi-material 6.
In order to easily agglomerate with 1, the multi-material slurry liquid 9 is preferably mixed with a polyacrylamide-based polymer (product name; Sunclock 210P, Sanyo Chemical Co., Ltd.) which is an anionic polymer flocculant.

An example of the blending amount of the above materials is shown in the table below.

[Table 1]

As a procedure for mixing and spraying the materials, the multi-material slurry liquid A (9) is put into the multi-material slurry liquid mixing tank 10 equipped with the stirring device 11 as shown in FIG. For this purpose, as shown in Table 1, the fresh water A ₅ 1
Add 500 liters, and then add ₂ kg of superabsorbent polymer (starch-polyacrylate polymer) A ₂ for about 5 minutes to absorb water sufficiently, and then add mulch material (cutting straw) A ₁ to 2
0 kg and binder (anionic asphalt emulsion) A
4 kg of ₃ and 400 g of high-molecular flocculant (anionic polyacrylamide polymer) A ₄ are mixed in specified amounts, respectively, and sufficiently stirred.

Next, the coagulant aqueous solution B (15) is put into the coagulant preparation tank 16. To this end, Shimizu B ₂ 0.99
While pouring water, 375 g of the polymer flocculant (cationic polyacrylamide polymer) B ₁ is mixed so as to be dispersed in water to be poured and sufficiently stirred.

After the respective materials are mixed as described above, the multi-material slurry liquid 9 is sent to the spray nozzle 18 by the slurry pump 12 and the coagulant aqueous solution 15 is sent to the spray nozzle 18 by the gear pump 17, and the hoses 13 and 14 in the middle of sending the liquids. Or, the two liquids are sprayed toward the construction surface while being mixed in the two-liquid mixing spray nozzle 19.

In this case, when the two-liquid mixing nozzle 19 is used, the multi-material slurry liquid A (9) uses the discharge pressure of the slurry which is vigorously discharged from the multi-material slurry discharge port provided in the nozzle, and the discharge port Inside the stirring cylinder provided at the tip, it is mixed with the coagulant aqueous solution B (15) mixed into the stirring cylinder. At this time, in order to sufficiently mix the two and not to reduce the flight distance of the slurry liquid, an air suction port is provided near the slurry liquid discharge port, and air is sucked by utilizing the pressure reduction by the discharge flow. The mulch material 61 that has been mixed well is ejected toward the slope.

In order to confirm the water-shrinkage state of the superabsorbent polymer which is sprayed by the above method and is condensed with the multi-material in the maximum water absorption state and adhered thickly, the aggregate of the multi-material slurry immediately after spraying is confirmed. 20 kg was collected and its weight was measured over time. As a result, after 5 days, most of the water was released, and after 10 days, water was discharged to the extent that the weight of the mulch material was left and contracted to stabilize the mulch material in a three-dimensional structure.

In comparison with this, a prior application (Japanese Patent Application No. 4-77772)
It took 40 days to obtain the three-dimensional structure of the multi-material formed in 10 days in the present invention. FIG. 5 shows the time-dependent change in the water retention amount of the gelled product when the superabsorbent polymer and silica sol were used.

FIG. 6 is a comparison of the correlation between the raw material cost and the gelling rate (gel time) of the gelling material of the silica sol of the stabilizer used in the present invention and the stabilizer used in the prior application. As can be seen, the raw material cost used in the present invention is about one-tenth or less of that of the prior application.

In this embodiment, the starch-polyacrylic acid type polymer is used as the super absorbent polymer, but the same effect can be obtained by using the polyacrylic acid type polymer. Also, although straw was used for the mulch material,
Similar effects can be obtained with the other multi-materials described above.

As described above, the present invention was developed for the purpose of adhering and stabilizing the multi-layer on the plant growth base formed on the bare sloped surface. The method of construction is not limited to the range of the simple sloping ground as described above, and can be applied to various ground surfaces that change more.

[0033]

The following effects can be obtained by implementing the present invention. (1) The highly water-absorbent polymer used for slurrying the multi-material aqueous solution quickly releases the absorbed water and returns to its original shape (about 1/1000 of the time when water is absorbed). The structure can be created early. (2) The use of super absorbent polymer makes it easy to make crushed materials such as rice straw, deciduous leaves, and bark, which are used as mulch materials, and have a large specific gravity, and have a long flight distance from the spray nozzle and a large transport amount. It becomes possible to transfer the liquid. (3) Mulch wood has a three-dimensional structure and is formed in the upper layer of the growth base, so that the extreme temperature change of the growth base due to direct sunlight can be mitigated and moisture can be prevented without impeding the penetration of rainwater into the growth base. In the natural soil layer of the forest, it is usually referred to as the A ₀ layer, which prevents the evaporation of water and prevents the erosion of rainwater on the surface of the base, and leaves are accumulated to form the topsoil. It exerts an effect close to that of a mulch layer and contributes greatly to the germination and growth of plants.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of a multi-layer formed on a growth base of a sloping land according to the present invention before water discharge of a super absorbent polymer (immediately after spraying).

FIG. 2 is a schematic cross-sectional view of a sloping ground when seeds and fertilizers are directly sprayed on the ground according to the present invention and a multi-layer is sprayed on the ground when the ground has good vegetation conditions.

FIG. 3 is a cross-sectional view showing a state of the superabsorbent polymer shown in FIG. 1 which has changed with time after being discharged with water.

FIG. 4 is a layout view of devices required for multi-layer construction according to the present invention.

FIG. 5 is a comparison diagram showing changes over time in the water retention amount of the gelled product when the superabsorbent polymer is used and when the silica sol is used.

[Fig. 6] Raw material cost and gelation rate (gel time) of a gelling material in the case of using the super absorbent polymer and silica sol.
It is a comparison diagram of.

[Explanation of symbols]

1 ... Ground 2… Slope of natural ground 4 ... Growth base (vegetation base) 5… Slope of growth base (slope) 6 ... Multi-layer 7 ... Binder 9 ... Multi-material slurry liquid 10 ... Slurry liquid mixing tank 11 ... Stirrer 12 ... Slurry pump 13, 14 ... Hose 15 ... Flocculant aqueous solution 16 ... Flocculant mixing tank 17 ... Gear pump 18 ... Nozzle 19 ... Two-liquid mixing nozzle 41 ... Seeds 42 ... Fertilizer 61 ... Multi material 62 ... Super absorbent polymer-encapsulated water gelation product 63 ... Super absorbent polymer solid after water discharge

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI // C09K 101: 00 C09K 101: 00 (56) References JP-A-53-277321 (JP, A) JP-A-6-70634 (JP, A) JP 4-194119 (JP, A) JP 59-74908 (JP, A) JP 60-241826 (JP, A) JP 3-240418 (JP, A) Kaihei 3-251117 (JP, A) JP-A-5-78662 (JP, A) JP-B-48-11604 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01G 13 / 00 A01N 3/00 C09K 17/22 C09K 17/32 E02D 17/20 102 C09K 101: 00

Claims (3)

(57) [Claims] 1. A cation when a multi-material slurry liquid (9) prepared by mixing water and a super absorbent polymer (62) in a multi-material (61) is pumped by a pump (12). Polymeric flocculant, which is mixed with an aqueous solution of polyacrylamide polymer (15) and sprayed on the construction surface of a plant growth base (4) to form a multi-layer (6). . 2. The multi-material slurry liquid (9) is prepared by adding a binder to the material.
A method for forming a multi-layer as described. 3. The method for forming a multi-layer according to claim 2, wherein the multi-material slurry liquid (9) is mixed with an anionic polymer flocculant polyacrylamide polymer.