JPH07103571B2 - Afforestation foundation construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a greening base for growing plants on a landslide slope, a construction surface in civil engineering work, etc. The present invention relates to a greening base construction method in which the surface of a plant growth base is covered with tape.

[Prior art] Generally, soil properties such as slope failure slopes, cut and embankment slopes generated by development work, and dune dune ground surface
When the growth conditions of plants are poor, such as bedrock, soft rock with little soil, sandy soil, and heavy clay soil, a greening base with a thickness that enables plant growth is being created for greening. .

In addition, the fields where seedlings are planted and the lands where seeds are sown are covered with straw or plastic film, and in dry areas such as deserts, the surface of the plant growth base that has been created is covered with plastic film for greening. By increasing or decreasing the temperature, it is possible to prevent the condensation of water on the lower surface of the film and the evaporation of water on the ground surface to prevent the plant growth base from drying.

As described in Japanese Utility Model Laid-Open No. 61-80801, a mud-like material that serves as a soil for greening is sprayed together with a hydrophobic agent and air in a nozzle, stirred and mixed, and sprayed onto the ground surface from a discharge port at the tip of the nozzle. The construction method is known. According to this method, the muddy material is mixed with the hydrophobic material and air in the nozzle,
It can be aggregated and sprayed to form a plant growth base on a slope.

In order to stabilize the sprayed plant growth base, it is known to mix plant fibers as so-called tuna wood in the mud-like material. Further, as described in JP-A-55-167170, sand, high-pressure water, and long fibers such as thin polyester are mixed and supplied to a construction surface, or they are mixed on the construction surface, and It is known to reinforce sand ground.

[Problems to be Solved by the Invention] In order to form a thick greening substrate by the conventional method described in Japanese Utility Model Laid-Open No. 61-80801, repeated spraying is required. However, in order to attach a thick layer of greening base to the slope and stabilize it, it is necessary to drain the previously sprayed base and stabilize it, and then repeat spraying, so there is a time loss waiting for the base to drain. . Moreover, according to this conventional method, the muddy material is aggregated and immediately hydrophobicized, but since the drainage from the inside of the substrate is gradually performed, if a large amount of muddy material is continuously sprayed, The amount of spraying is also added, and slipping occurs, so it is necessary to limit the amount of spraying once.

Conventional tuna wood, which is mixed in mud to stabilize the sprayed substrate, has a short fiber length of 2-3 cm and is not effective. The longer this work is, the more effective it is.However, if long work is mixed in the mud-like soil material in advance, it will wind around the material stirring shaft and entangle on the pumping pump shaft for spraying. However, there is a limit to the length of the jumper material that can be mixed in, because it causes blockage in the pump such as clogging between the impeller and the casing.

The technique described in JP-A-55-167170 can reinforce and stabilize the ground of sand with long fibers,
It is not possible to prevent the soil from drying or mitigate the temperature change in the soil. Generally, the slope of a rock bed where the growth conditions of plants are particularly bad is that only about 5 cm of soil or vegetation base material is attached. In such a case, vegetation base material such as soil is attached. Even in the midsummer, it is completely dry in a short time under the hot sun, and the seedlings of the finally grown plants often die due to lack of water. In addition, for permanent greening, it is desirable to introduce woods from the beginning and to make forests at an early stage, but woods can be used for dry and wet and cold (cold) temperatures of the base after construction (sowing). The germination depends on the difference. Therefore, the introduction of woody plants must be carried out in the spring in order to ensure a sufficient growth period after sowing.
To this end, it is necessary to reduce the rise and fall of temperature in the growth base due to the difference in temperature of the outside air, and to prevent the evaporation of water from the natural ground, thereby extending the period during which woody plants can be sown (sown). It is necessary to plan and to be able to sow in the spring.

Therefore, the object of the present invention is to prevent the greening base material from slipping off due to continuous spraying of a large amount of mud material, prevent the generation of water from the ground and mitigate the temperature change in the vegetative base material. Especially.

[Means for Solving the Problems] The present invention basically comprises stirring and mixing a mud-like soil material base material, a hydrophobic material, and a tape-shaped continuous element having heat ray-reflecting and water-impermeable properties, and stirring the mixture. The above-mentioned object is achieved by spraying a greening base material, which has been embraced with a target element, into a plant growth base together with a continuous element, and coating the surface of the plant growth base with the continuous element.

Therefore, in the greening foundation construction method according to the present invention, the tip end portion of the ejection port is formed into a narrowed shape, a cylinder having a discharge port and a stirring blade is continuously provided to the tip end portion, and the cylinder body is provided in front of the stirring blade. Using a spray nozzle provided with a hydrophobic agent injection port and an air intake port, a mud-like soil material base material diluted with water is press-fitted into the spray-in nozzle, and the mud-like soil material base material is aggregated to form a greening base. A hydrophobic agent forming a material is injected into the nozzle from the hydrophobic agent inlet, and air and a tape-shaped continuous element having heat ray reflectivity and water impermeable are introduced into the nozzle from the air inlet, The muddy soil material base material, the hydrophobic material, the air, and the continuous element are stirred and mixed to form the aggregated and aggregated greening base material by embracing the continuous element, and the greening base agent is Spray the plant growth base with the continuous elements Characterized in that the covering. The continuous element may be an aluminum foil tape, or may be an aluminum foil or a tape having aluminum powder adhered to it.

[Operation and Effect] In the spray nozzle, negative pressure is generated in the cylinder by the jet of the greening base material from the jet outlet, and this negative pressure sucks the outside air into the cylinder. At this time, the continuous element is introduced into the cylinder together with air from the air inlet. In the cylinder, the mud-like soil material base material, the hydrophobic agent, air, and the continuous element are stirred and mixed, and water is separated from the mud-like soil material base material by the action of the hydrophobic agent. Granulated. This agglomeration occurs during stirring and mixing in the cylinder, and the agglomerates are formed in a form in which continuous fibers are included. Therefore, the aggregates of the greening base material are combined with the continuous elements, and when they are ejected from the ejection port of the spray nozzle, they form a chain and pull the continuous elements. For this reason, the flight distance of the greening base material toward the construction surface becomes long, and voids are secured by stacking aggregates on the construction surface, and the water retention, drainage, and heat retention properties of the construction surface after spraying are secured. And the stability of the greening base is enhanced by the reinforcing effect of the continuous elements.

A mud-like soil substrate diluted with water, a hydrophobic material, and a tape-like continuous element having heat-reflecting and water-impermeable properties, for example,
An aluminum foil tape or a continuous element consisting of an aluminum foil or a tape to which aluminum powder is adhered is mixed by stirring to agglomerate, and this is sprayed onto the surface of a pre-formed plant growth base, and the surface is the tape. By covering the fields where seedlings were planted or the seeds were sown with straw or a plastic film, or in dry areas such as deserts, the entire surface of the vegetation surface was covered with film to lower and raise the ambient temperature. It is possible to obtain the same effect as that of the film mulching method for stopping the evaporation of moisture that condenses to the surface or the moisture of the ground to prevent the moisture from drying. That is, when the continuous element is sprayed on the surface of a plant's growth base to cover its front surface, even if there is a difference in the temperature of the outside air due to the covering, the increase in temperature in the growth base is reduced by heat ray reflection. In addition, it is possible to prevent the evaporation of water from the natural ground and to extend the period in which plants can be sown.

According to the present invention, the flight distance of the greening base material that comes out from the discharge port of the spray nozzle is increased, which increases the work efficiency and enables the construction on a long slope in a short time. Further, according to the present invention, by covering the surface of the greening base with a continuous element in the form of a tape having heat ray reflectivity and water impermeability, the water retention effect in the greening base is raised, and the mulching effect on the germination and growth of the plant. Goes up. Furthermore, according to the present invention, by covering the surface of the greening base with continuous tape-shaped elements having heat ray reflectivity and water impermeability, a heat retaining effect in the greening base can be obtained, and a suitable time for construction such as seeding can be obtained. It is possible to expand.

[Embodiment] FIG. 1 shows a spray nozzle 10 used in the greening base construction method of the present invention. A cylindrical body 2 is attached to the tip end portion of the spout 1 of the mud-bearing soil base material (hereinafter referred to as “mud-like material”) M.
Are connected, and a plurality of stirring blades 2a are projectingly provided in the cylindrical body. An air suction port 3 is provided in the cylindrical body (hereinafter referred to as “stirring cylinder”) 2 in the vicinity of the jet port 1 in front of the stirring blade a. Further, a continuous tape-shaped element T is provided on the stirring cylinder 2 near the air intake port 3 to form the air intake port 3.
A guide 5 having a guide hole 4 is provided for introducing the air into the stirring tube 2 together with the air. If the number of the guides 5 is increased in the circumferential direction of the stirring cylinder 2, two or more tape-shaped continuous elements T are simultaneously fed into the stirring cylinder 2, and the mixing density of the continuous elements T in the greening base material G is increased. Can be increased.

In FIG. 1, 7 is a discharge port of a spray nozzle 10, 8 is a mud material metering cock, and the inside of the cock is a ball valve type. 9 is a rubber hose and is a muddy material M
Of the delivery pump (not shown).

The stirring cylinder 2 has an inlet for the hydrophobic agent F near the air inlet 3.
11 is provided, and the hydrophobic agent F is injected into the stirring cylinder 2 through a pipe 12 by a pump (not shown). 13 is a cook and 14 is a scroll of continuous elements T.

According to the present invention, the greening base material is created by spraying the greening base material G on the plant growth base using the spray nozzle 10. First, the muddy material M pumped by a muddy material delivery pump (not shown) enters the spray nozzle 10 through the rubber hose 9. At this time, the amount of the muddy material M adjusted by the metering cock 8 reaches the ejection port 1 and is ejected into the stirring cylinder 2 from here. Due to this ejection, a negative pressure is generated near the inlet of the stirring cylinder 2, and the negative pressure causes the air A to be sucked into the stirring cylinder 2 from the air suction port 3. The tape-shaped continuous element T sucked by the suction force of the air A is
It is fed from the scroll 14 through the guide hole 4 leading to the air intake port 3, enters the stirring cylinder 2, and enters the mud-like material M in the stirring cylinder 2.
Unites with Air A. On the other hand, the hydrophobic agent F is pumped by a pump (not shown), passes through the pipe 12, and the hydrophobic agent injection port.
It is introduced into the stirring cylinder 2 from 11. In the stirring tube 2,
The muddy material M, the hydrophobic agent F, the air A, and the continuous element T are agitated and mixed by the stirring blade 2a, and the muddy material M is hydrophobicized and aggregated in a form in which the tape-shaped continuous element is included, A green base material G is formed, and the green base material is discharged from the discharge port 7 toward the construction surface together with the continuous elements.

Since the greening base material G and the continuous element T are formed in such a manner that the former embraces the latter, the bonding or familiarity (adhesion) between the two is good and a stable roadbed can be formed. . By increasing the size of the guide hole 4 for introducing the continuous element T into the stirring tube 2, it is possible to avoid blocking the guide hole 4 during the introduction of the continuous element T. Further, the discharge port 7 of the spray nozzle 10 can be formed sufficiently large, and the aggregated greening base material G is sprayed toward the construction surface in a state of being connected to the continuous element T in a chain shape, so that the greening base material The flight distance of the material G is far longer than that of the conventional one, which enables construction work such as a long slope.

The muddy subsoil base material M in the present invention uses soil as a base material, and appropriately mixes fertilizers, seeds, rhizomes and the like into the base material, and optionally mixes plant fibers, erosion inhibitors and the like. It is a mud-like mixture prepared by mixing a certain amount of water. The injected hydrophobic agent is, for example, a polyacrylic amide hydrolyzate, and has an effect of acting on the mud-like soil material M to separate water and aggregate the water. Then, the tape-shaped continuous element T is
It is a relatively lightweight tape such as an aluminum foil tape, a tape obtained by laminating aluminum foil, or a tape to which aluminum powder is attached. By using these tapes, the difference in humidity in the soil can be reduced. In addition, it is possible to reduce the effect of the temperature difference of the outside air on the inside of the greening base,
It is possible to reduce the influence of hot weather in summer, and thus to extend the time period suitable for greening work which may be forced to be performed in an inappropriate time.

As shown in FIGS. 2 and 3, the continuous elements T are arranged in a mesh shape in the vertical and horizontal directions, and the greening base material G is attached to the upper and lower sides of the continuous element T to be laminated to form the soil layer B and the slope K. Is being stably constructed.

As is clear from FIG. 4 showing a state in which the continuous elements T are mixed in the green base material G, the green base material G is an aggregate of a large number of aggregates P, and the continuous elements T are aggregates P. It is mixed in the greening base material in an intertwined state. This allows
The aggregates and the continuous elements are mutually supported and have a gap between them that allows water retention and ventilation.

Continuous element T three-dimensionally mixed in the greening base material G
Supports and reinforces the greening base material G, which tends to slip due to mutual entanglement, so that the spraying thickness can be made 10 cm or more by one spraying operation,
A stable greening base can be created efficiently, and a significant improvement in efficiency can be achieved regardless of the slope of the slope, soil quality, and rock quality.

By the way, this invention is implemented in order to raise the effect of the water retention, the drainage, etc. to the plant growth base already formed. Generally, in cultivating crops, a mulch method of covering the crops with straw or vinyl film is used to prevent the soil from becoming too dry or too wet. The purpose is to improve the water retention of the vegetation surface of the target plant growth base by using a long tape having a continuous element of water permeability, particularly a tape having heat ray reflectivity and water impermeability. Then, a water impermeable tape is sprayed and attached to the surface of the vegetation surface. At this time, in order to extend the flight distance of the tape, a mud-like soil material base material is used. Further, the present invention is intended to perform a tape mulching method in which a plant-shaped growth base of a plant is covered with a tape-shaped film to form a multi-layer with the tape. Therefore, it is preferable to use a single tape having a width of about 2 cm.

In the example shown in FIG. 6, a slope 26 is formed in advance on a rock slope 21 as a plant growth base by spraying it onto a 10 cm-thick substratum. This is fixed to a rock slope by a base net 23 made of a wire net, a resin net or the like and an anchor 24, and a vegetation material such as seeds 25 is included therein. Further, in the example shown in FIG. 7, a seed spray layer 27 containing vegetation material such as seeds 25 is thinly formed on a slope 22 which is easy to dry, such as sandy soil. According to the present invention, a green substrate is sprayed on the slopes 21 and 22 together with a tape 31 having heat ray reflectivity and water impermeability to form a tape multi-layer 35. According to the experiment, in comparison with the change in the underground temperature of the unconstructed area according to the present invention, the change of the underground temperature of the applied area according to the present invention corresponds to the change of the outside temperature. It was loose. From this, the period of temperature suitable for germination and growth of the plants in the base is extended compared to the non-constructed section, and the period during which woody plants can be constructed (sown) can be expanded.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a spray nozzle used in the construction method of the present invention, FIG. 2 is an exploded front view of a sprayed slope, FIG. 3 is a sectional view of the same slope, and FIG. 4 is agglomerated greening. FIG. 5 is an enlarged plan view showing a mixed state of a base material and a continuous element, FIG. 5 is a cross-sectional view of a greening base constructed on a plant growth base according to the present invention,
FIG. 6 is a cross-sectional view of a greening base constructed on a seed spray layer according to the present invention. 1 ... Jet port 2 ... Cylindrical body (stirring cylinder) 2a ... Stirring blade 3 ... Air inlet 7 ... Discharge port 10 ... Spray nozzle 11 ... Hydrophobic agent inlet M ... Mud soil base Material G: greening base material T: tape-like continuous element

Claims (2)

[Claims] 1. A jet-shaped tip of a mud-bearing soil base material has a narrowed shape, and a cylinder having a discharge port and a stirring blade is connected to the tip, and the cylinder is provided in front of the stirring blade. A spray nozzle provided with a hydrophobic agent injection port and an air intake port is used, and a mud-like soil material base material diluted with water is press-fitted into the spray-out nozzle, and the mud-like soil material base material is aggregated to form a greening base. A hydrophobic agent forming a material is injected into the nozzle from the hydrophobic agent inlet, and air and a tape-shaped continuous element having heat ray reflectivity and water impermeable are introduced into the nozzle from the air inlet, The muddy soil material base material, the hydrophobic material, the air, and the continuous element are mixed by stirring to embed the continuous element to form the aggregated greened base material. Characterized by spraying a plant growth base with the continuous element to cover its surface Greening foundation reclamation method to. 2. The greening base construction method according to claim 1, wherein the continuous element comprises an aluminum foil tape or an aluminum foil or a tape having aluminum powder adhered thereto.