WO2005090692A1

WO2005090692A1 - Fiber-reinforced soil construction method and fiber-reinforced soil structure

Info

Publication number: WO2005090692A1
Application number: PCT/JP2004/003870
Authority: WO
Inventors: Naoki Horie
Original assignee: Nittoc Construction Co., Ltd.
Priority date: 2004-03-22
Filing date: 2004-03-22
Publication date: 2005-09-29
Also published as: TW200532074A

Abstract

A fiber-reinforced soil construction method spraying multiple pieces of continuous fibers and sandy soil onto a construction area to be reinforced for building up reinforced soil by continuously entwining and mixing the fibers with the sandy soil and a fiber-reinforced soil structure with uniform quality and sufficient strength built up by the construction method. The construction method can provide the reinforced soil with sufficient strength by jetting and mixing the fibers so that the fibers can be properly mixed in the reinforced soil and uniformize the quality of work with excellent workability. The construction method builds up the reinforced soil by entwining and mixing the fibers delivered from a fiber supply device with the sandy soil carried from a sandy soil carrying device by using a fiber-reinforced soil device having the sandy soil carrying device for carrying the sandy soil and the fiber supply device for continuously supplying the fibers. The fibers are continuous ones, and linearly oriented in the sandy soil. The mixing direction of the fibers from the fiber supply device in the sandy soil through an ejector is formed in a receiving panel shape.

Description

Specification

Fiber reinforced soil method and fence reinforced soil construction

The present invention relates to a fiber reinforced soil construction method for blowing fibers and sand or sand or similar to sand (hereinafter referred to as sandy soil) to a site to be reinforced, and a fiber reinforced soil construction constructed by the construction method. Background art

In the past, as a method to strengthen β; on slopes, etc., it was covered with a rigid structure by piling up concrete plans on slopes, etc. Also considered: «Strengthening is desired.

Therefore, as a method of greening the surface by means of «and«, while making the slope of the slope 31 relatively gentle, as an example, Fig. 1 As shown in Fig.18 and Fig.18, as shown in Fig.18, after placing the main anchors 1 pin 4 8a and the auxiliary anchors 1 pin 4 8b by steel rods etc. in a skewer-like manner on the slope 3 1 Spraying soil or mortar alone or spraying material such as customer soil or mortar while the lath wire mesh 47 is stretched on the slope 31 is carried out.

Also, if the slope of slope 31 is relatively steep, as an example, as shown in Fig. 19, a block of stone 49 etc. is piled up on foundation concrete 51. Or, although not shown, wire-gray and spray mortar. In each case, the method of spraying and forming the growth base material 62 for vegetation having a thickness of about 3 to about L 0 cm was subsequently performed.

However, this method has limitations in terms of strength. For example, rainfall immediately after spraying, snow melting water, etc. caused erosion of the spray material 61 due to runoff collapse and erosion of the greening base material. In addition, the growth base material for apricot growth 3 to 2 to 1 O cm thick is used to support the growth of plants. There is a limit and it is not enough for plants to grow persistently and healthy.

As another example, as shown in FIG. 20, a pot-like greening block 50 prepared by filling soil or the like in a container having an open top on foundation concrete 51 is stepped along the slope. It is known how to plant plants 52 in soil that is slightly exposed to the top of greening blocks 50. However, this method can not green the entire slope, which is not desirable in terms of landscape.

Also, as shown in Fig. 21 A, Fig. 21 B, in the same way as Fig. 18 A, Fig. 18 B, a main anchor pin 4 8 a and an auxiliary anchor pin 4 8 b are driven to form a wire mesh. After forming a legal frame 53 formed by spraying a mortar onto the frame-enclosed part, a lath wire mesh 47 is stretched in the frame to form a growth base material 54 with a thickness of 3 to 10 cm. Methods of spray construction are also known. However, even with this method, the growth base material for vegetation with a thickness of 3 to L 0 cm has a limit to support the growth of plants, and is insufficient for the plants to grow persistently and healthy. is there. In addition to this, the entire slope can not be greened because it becomes green in the lattice frame, which is not preferable in terms of landscape.

Therefore, it is recommended that E-fibers be mixed as a ground stabilization method by mixing in E-fibers, as described in Japanese Patent Publication No. 5 3 4 7 6 0 2 or Japanese Patent 5 5-1 6 7 1 7 0 etc. By mixing the continuous fiber into the spray material, the effect of preventing the runoff of the spray material is enhanced, and the reinforcing effect by the pseudo-adhesive force of the continuous fiber is obtained. As a result, it is possible to reduce the use ratio of cement and other bonding materials in the spray material, and make it possible to use the reinforced soil itself created by the spray material and continuous fibers as the plant growth base. That is, it is possible to green the entire slope of reinforced soil, which is excellent in terms of landscape.

However, depending on the mixed state of fibers, sufficient strength as reinforcing soil may not be obtained. In this case, particularly, if the reinforcing soil is made thicker to perform later, the reinforcing soil is further broken. It becomes easy. For example, in Japanese Patent Publication No. 2 879 4 7 7, the main body of the third material is transported in one hollow pressure-feeding channel and jetted from a spray nozzle provided at its tip or at its tip. At the same time, the continuous fiber yarn is put on the air flow by air pressure blowing inside the other hollow pumping conduit, and it is discharged from the above-mentioned BJi feeding conduit or the spray nozzle provided at the tip, and the discharge direction of the bracket. A soil stabilization method has been proposed, which is characterized in that it is made to intersect with the flow of the material based on the agate improvement material, and the discharged fiber yarn is carried on the flow of the above-mentioned material and sprayed onto the surface to be improved as an integral material. The improved material is pumped by a pump.

As shown in FIG. 22, the spray material main body is pumped through a hose 102 by a pressure feed pump and sprayed from a spray nozzle 101 at the tip onto a target surface, for example, a slope surface.

On the other hand, continuous fiber yarn 103 such as polypropylene is introduced into the fiber nozzle 104, and is ejected from its tip by compressed air by the compressor. The fiber nozzle 104 is integrated with the spray nozzle 101 by the stopper 105, and the jet direction of the fiber nozzle 104 intersects with the jet direction of the spray material from the spray nozzle 1. It is supposed to

Focusing on the degree of tension of fibers in reinforced soil, as shown in Fig. 23, it can be seen that the pseudo-cohesion C 'of reinforced soil is significantly increased by increasing the degree of tension of fibers. Assuming that the fiber laying speed is Vmax and the fiber feeding speed is V, the fiber tension is Vmax / V. The degree of tensioning of the fiber increases as this value approaches 0 to 1, 1 At the time, fibers are laid without slack. In order to fully exert the reinforcing effect of the fiber, it is important to devise a construction method that secures as high a fiber tension as possible since the fiber tension is the dominant factor.

It is difficult to uniformly disperse the bundled fibers as shown in FIG. 22 by means of the method of discharging the bundled fibers from one nozzle, resulting in curling or dumpling, and the strength is questionable.

Also, focusing on the laying direction of fibers in reinforced soil, the strength against shear force differs depending on the direction, and depending on the laying direction, sufficient strength as reinforced soil may not be obtained.

Therefore, the object of the present invention is to create a reinforced soil by intermingling and mixing fibers with sandy soil continuously. In the fiber reinforced soil construction method, by laying the fibers in such a way that the mixture of fibers in the reinforced soil is appropriate, reinforced soil with sufficient strength can be obtained, and fiber with good workability and uniform working quality can be obtained. It is an object of the present invention to withdraw a fiber reinforced soil construction method, and to construct a fiber reinforced soil construction which can be constructed by the construction method with good workability and which is homogeneous and has sufficient strength. Disclosure of the invention

In order to achieve the above object, the present invention according to claim 1 means sandy soil (an object similar to sand or sand, for example, mountain sand, river sand, sea sand, masa soil, soil, etc.). ) Using a fiber-reinforced soil device equipped with a sandy soil conveying device that carries out a thigh) and a fiber feeding device that supplies fibers continuously, a fiber feeding device to the sandy soil that is transported from the sandy soil transportation device In the fiber reinforced soil construction method, in which fibers drawn out from the fiber are entangled and mixed to form a reinforced soil, the fibers are continuous fibers, and the point is that the fibers are linearly oriented to the sandy soil.

According to the present invention as set forth in claim 1, the fibers are continuous fibers, and the sandy soil and the fibers can be uniformly dispersed and mixed by linearly orienting to the sandy soil. As a result, the development of strength as a fiber tension reinforcement is obtained.

According to the second aspect of the present invention, the jet ejector which jets and delivers the fiber together with high pressure water or compressed air is connected to a high pressure water or compressed air supply pipe, and the ejector is used to connect fibers from the fiber supply device. According to the present invention, it is another object of the present invention according to the second aspect of the present invention that the fibers are discharged with the ejector separately from spraying of the sandy soil. Since the mixing direction of the fibers from the fiber supply device to the sandy soil is made to be a receiving plate, the fibers do not flow and the shear strength can be secured. .

The present invention according to claim 3 is characterized in that the ejector is provided with a plurality of injection nozzles. According to the third aspect of the present invention, the sandy soil and the fibers can be uniformly distributed by injecting the fibers from the plurality of jet nozzles.

According to a fourth aspect of the present invention, the ejector resonator is constituted by a combination of a header provided with a plurality of injection nozzles and a peristaltic means of the header.

According to the fourth aspect of the present invention, since the header of the ejector is swung by means of the peristaltic means, the fibers can be laid in a uniformly tensioned state, and the tension of the fibers can be increased to reinforce the soil. It is possible to ensure uniform tackiness due to fiber tension in the

Also, as the header of the ejector is automatically oscillated by the peristaltic means, the tip of the spray nozzle is automatically moved within the area where the sandy soil is discharged. Therefore, the worker only needs to have the ejector, and there is no need to shake it, so the workability is good, and the load on the operator is large and the worker is required to swing the ejector manually. iiiS makes up for the disadvantage that it is also difficult to do, and it has good workability.

Furthermore, by making the mixing direction of the fibers from the fiber supply device into the sandy soil be like a receiving plate, the fibers do not become flow-like and shear strength can be secured.

The gist of the present invention according to claim 5 is characterized in that the receiving plate has a height angle of 7 ° to 20 ° with respect to the horizontal plane intersecting with the slope which forms the reinforced soil.

According to the present invention as set forth in claim 5, the required shear strength can be obtained with certainty. That is, when a fiber reinforced soil is to be built on the slope for slope protection, the thickness of the buildup is the integrity of the soil structure, the mixability of sandy soil and fibers, and the vegetation base. From the point of view as a smooth slope, the minimum thickness is 15 cm. According to the invention as set forth in claim 5, in addition to the ffS action, the so-called fiber mixing direction is received against the slope. If it is assumed to have a height angle of 7 ° to 20 ° with respect to the horizontal line that intersects the slope, the slope will be 1: 1.5 to 1: 0.8: ^ The horizontal thickness is approximately 30 cm in thickness, and 15 cm or more of construction thickness can be secured.

The invention according to claim 6 is characterized in that the jet velocity of the fiber is from 3 0 0 m to 1 0 0 0 m / min. The gist of the invention is to make the peristaltic angle of the header 10 to 30 degrees.

According to the present invention as set forth in claim 6, from the empirical values from the results of experiments at several types of swing angles, the fiber injection velocity is set to 3 0 Om to l, 0 0 O m / min, The fibers can be blended with the sandy soil on average when the shaking angle of the header is 10 degrees to 30 degrees.

The gist of the present invention according to claim 7 is characterized in that a rigid fiber is placed on a slope which is to be reinforced, and the upper end of the body projecting from the slope is covered with the reinforcement.

According to the present invention as set forth in claim 7, since the rigid rod-like body llli 耑 having one end placed on the slope of the reinforced soil is covered with the reinforced soil, the fibers in the reinforced soil are rigid. Reinforcement with the body Improves the integrity of the soil and the slope of the ground, making it less likely to slip or collapse. A well-known ground anchor method or a lock bolt method can be used as a method of placing one end of an I-shaped penetrator on a slope to form reinforced soil and projecting it from the slope.

The gist of the present invention according to claim 8 is that the fiber reinforced soil construction is constructed by the method according to claim 1.

According to the present invention as set forth in claim 8, the fibers are arranged in a receiving disk shape in the reinforcing soil, so that the fibers do not flow and the shear strength can be secured, and the fibers are in a tensioned state. The fiber reinforced soil structure can be made homogeneous and have sufficient strength due to pseudo adhesion. Brief description of the drawings

FIG. 1 is an explanatory view showing one embodiment B of the fiber reinforced soil construction method of the present invention.

FIG. ² is an explanatory view of strength calculation of the fiber reinforced soil method of the present invention.

FIG. 3 is a schematic view of the construction of the fiber reinforced soil construction method of the present invention.

FIG. 4 is an explanatory view of a form of the fiber reinforced soil method of the present invention.

FIG. 5A is a longitudinal cross-sectional view showing one embodiment of a slope-protected type construction constructed by the fiber reinforced soil method of the present invention. FIG. 5B is a partially cut away plan view showing one embodiment of the construction of the slope protection rope constructed by the fiber reinforced soil method of the present invention.

FIG. 6 is a longitudinal side view showing an embodiment of a retaining wall shape type construction created by the fiber reinforced soil method of the present invention.

Fig. 7A is a plan view of the ejector.

FIG. 7B is a front view of the ejector.

FIG. 8 is an operation explanatory diagram of one ejector.

FIG. 9 is an explanatory view of a process of creating reinforced soil in the embodiment of the fiber reinforced soil construction method of the present invention.

FIG. 10 is an explanatory view of a completion state of reinforcement soil creation in the embodiment of the fiber reinforced soil construction method of the present invention.

FIG. 11 is an explanatory view showing a state in which continuous fibers are built so as to have a receiving disc shape in one embodiment of the fiber reinforced earth construction method according to the present invention in comparison with a state in which the continuous fibers are built in a flow disc shape.

FIG. 12 is an explanatory view showing the relationship between the slope slope and the slope of the finished surface in the fiber reinforced soil construction method of the present invention.

FIG. 13 is an explanatory view showing a completed state of a planting hole in the embodiment of the fiber reinforced soil construction method of the present invention.

FIG. 14 is an explanatory view showing a state of planting seedlings in the embodiment of the fiber reinforced soil construction method of the present invention.

FIG. 15 is an explanatory view showing a state in which the thick layer base material is sprayed in the embodiment of the fiber reinforced soil construction method of the present invention.

Fig. 16 is a perspective view of a case where a rigid body is placed on the slope to construct reinforced soil. Figure 17 A is a perspective view of the pin.

Figure 17B is a cross-sectional plan view of the pin.

Fig. 18 A is a longitudinal cross-sectional view showing an example of a structure created by the «method of construction. Fig. 18 B is a partially cutaway plan view showing an example of a construction constructed by the conventional method.

FIG. 19 is a longitudinal side view showing another example of the construction constructed by the conventional method. FIG. 20 is a longitudinal side view showing still another example of the construction constructed by the conventional method o

Fig. 21 A is a longitudinal side view showing still another example of the construction constructed by the conventional method.

Fig. 21 B is a partially cut away plan view showing still another example of the construction constructed by the conventional method.

Figure 22 is an explanation showing one of the fine examples of the fiber reinforced soil method.

FIG. 23 is a graph showing the relationship between the tension of fibers and the shear resistance angle and pseudo adhesion. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in Fig. 5A, Fig. 5B, and Fig. 6, after placing an anchor with plate 40 provided with a plate 40 a against the sloped slope or embankment slope and after performing drainage and back surface drainage Create a fiber reinforced soil 55 with a substantially uniform thickness on the slope according to the slope of the ground 41 (hereinafter referred to as slope protection type diagram 5A, 5B), or Fiber reinforced soil 5 5 shall be created by making the butt side thicker to form a retaining wall (hereinafter, Retaining wall prison type).

Back surface drainage is carried out by laying back surface drainage material 81 with a porous mat with a thickness of about 1 to 3 cm, as shown in Fig. 5B. In addition, the anchor with a plate with a plate 40 is cast by a rock bolt (rebar insertion bar), for example, after a grout injection consisting of cement milk with IJ hole, water cement ratio 50% of water cement ratio by a hammer drill. At least the plate 4 0 a protrudes from the ground 4 1 with the plate anchor 40 provided with 4 0 a Insert it into the hole drilled by and fix it.

Next, an outline of the apparatus used in the embodiment of the fiber reinforced soil construction method according to the present invention and the operation thereof will be described below.

As shown in Fig. 3 and Fig. 4, 1 is a fiber feeding device, and the high-pressure water sent from the water tube 3 through the high-pressure pump 4 through the feeding pipe 5 is fed from the fiber feeding device 1 It consists of an ejector 17 that ejects from the injection nozzle 6 using the above, and this is combined with a sandy soil supply device 8. Here, sandy soil refers to sand or sand-like material, for example, mountain sand, river sand, sea sand, masa soil, soil, and gravel.

The sandy soil feeder 8 comprises a scale 11 having a hopper 10 connected to a belt conveyor 9a, and a sprayer 12 connected to the scale 11 via a belt conveyor 9b. . In the figure, 13 indicates a tractor-excavator that performs sand or sand-like objects from sandhill 14 and 15 indicates a compressor that supplies compressed air to sprayer 12. The material hose 3 3 is connected to the sprayer 12, and the tip thereof is sand or a jet nozzle of an object similar to sand.

Further, reference numeral 16 denotes a power supply β 1, serving as a power source for the measuring instrument 11, etc., 17 denotes a distribution board, and 18 denotes a measuring device for measuring the amount of fiber delivered from the fiber supply device 1.

The fiber feeder 1 comprises a portable bobbin case 21 having a single guide stage 20 for bundling and feeding the fibers 2 from a plurality of (four in the illustrated example) yarn rods 19.

In the fiber arrangement device of this configuration, as shown in FIG. 7A and FIG. 7B, the ejector 7 comprises a combination of the header 22 and the peristaltic means 23. The fiber 22 from the fiber feeding device 1 It has four fiber guides 24 and a jet nozzle 6 for jetting this fiber 2 together with high pressure water or compressed air.

The pivoting means 23 pivots the cylinder 2 7 obliquely upward to the other end of the arm 2 9 whose one end is attached to the base 30, and the tip of the piston 2 8 of the cylinder 2 7 The upper end was pivotally mounted, the lower end of the swing arm 26 was fixed to the pivoting tube 25, and the pivoting tube 25 was coaxially connected to the header 12. And, the high pressure water can be Which supply pipe 5 to connect. In the figure, 32 is an operation unit.

To explain the operation, carry in the bobbin case 21 to the construction site such as slope 31 and move it to the appropriate place. In each bobbin case 2 1 of the fiber supply device 1, 4 fibers 2 drawn out from the yarn rod 1 9 are bundled into one, and it comes out from the discharge port 35 and the guide stay 20, and the ejector 1 is removed. The jet nozzle 6 is inserted through the fiber guide 24 of 7. The feed rate of fiber 2 is detected by a load cell 34 and measured by a weighing device 18.

When the high pressure water fed from the water tank 3 through the high pressure pump 4 is jetted from the jet nozzle 6 from the water tank 3 in the ejector 1, the iB fiber 2 is also discharged. Sprayer 1 2 The material hose 3 3 It is directly injected and mixed on the ground with sand or sand-like material that is ejected from the tip injection nozzle onto the slope ground.

At this time, by operating the operation part 32 of the ejector 7, the piston 27 of the cylinder 27 goes forward, and the upper end of the swing arm 2 6 attached to the tip of the piston 28 is circled accordingly. The arc-shaped locus is moved to move, and the lower end is rotated at the fixed part with the rotating pipe 25.

As a result, the pivoting tube 25 pivots integrally with the lower end of the pivoting arm 26. This pivoting motion is transmitted to the coaxial header 12 and the header 12 also pivots. As a result, the injection nozzle 6 provided in the header 22 moves in an arc shape.

Therefore, if the operator holds the ejector ector 7 by hand, the injection nozzle 6 automatically oscillates without moving the hand, and the injection destinations of the fiber 2 and the jet water reciprocate automatically, and each part becomes uniform. Mix with sand or something similar to sand.

The ejector 7 may be one that jets from the jet nozzle 6 using compressed air instead of high pressure water.

As shown in FIG. 8, when the cylinder stroke length and arm length of the ejector 1 are changed to obtain the height lm, the number of oscillations used in the ejector 1 is the oscillation angle of 28 degrees. The installation time was 3 m ^{3 and} the installation quantity was 5 to 6 times / sec, and the installation quantity of time 6 m ³ was 7: L 0 times / sec. Further, as described above, the header 22 is rotated by the reciprocating motion of the piston 28 of the cylinder 27 as described above, whereby the injection nozzle 6 provided on the header 122 is curved in an arc-like lS. Although it moves, as the injection nozzle 6 swings, the injection destination of the fiber 2 and jet water automatically reciprocates.

As a result, the continuous fibers 2 can be linearly oriented to the sandy soil, and the fibers can be jetted evenly to the sand as a whole or to a thing similar to sand.

In this way, while spraying fibers and sandy soil, reinforced soil is created so as to cover the anchor with a plate that protrudes from the ground 41.

In addition, the fiber is injected with the jet water, and the amount of the fiber mixed in the fiber reinforced soil, which is mixed with sandy soil, is secured at 3.3 kg / m ³ .

Furthermore, as the standard of sandy soil to be used, in addition to borax, it is also possible to use soil such as shirasu of Shirasu plateau or Masa of granite area, and various types of soil can be used. If you cut down Shirasu or Masa soil and use it as it is, it will cause problems such as stagnation, clogging in the material hose 3 3, and inability to send air pressure, but mixing these with surfactant will make the material hose 3 3 According to the empty EE coma, even tough local generated soil such as shiras or masa can be pneumatically transported without clogging inside the material hose 33, and fiber reinforced soil construction method becomes possible. In addition, it is also possible to use a sieve to adjust the particle size.

In this way, when the fiber reinforced soil 55 is formed, the direction of mixing of the fibers from the fiber supply device 1 into the sand is made a receiving plate, and the receiving plate is a slope protection type. In the case, the height angle is 7 ° to 20 °, preferably 15 ° or more, with respect to the horizontal plane X intersecting the slope 31. In Fig. 11, (b) is the case where the fiber direction is flow-shaped.

As a result of constructing the fiber reinforced soil 55 so as to have a receiving plate shape as described above, the constructed structure can obtain sufficient strength.

-As an example, it has a height angle of 15 ° to the horizontal plane where the fiber intersects the slope When the fiber reinforced soil 55 is constructed so as to become a receiving plate, referring to FIG.

a: The angle between the placement slope of the fiber and the shear plane

Ω: angle between horizontal plane and shear plane

15 degrees: fiber placement slope

It is.

When the slope slope is 1: 0.8,

= = Ω + 15 = 15 + 15 = 30 degrees

W = W1 + W2

= {(hxd / 2) x t + L x t x tGEO} x D x 1/2

= {(1.09 x 1.88 / 2) x 18.00 + 3.00 x 0.20 x 18.00} x 1.5 x 1/2

= 21.93 KN

R = Wsin 33.7

= 21.93 sdn 33.7

= 12.17 KN

S = Rcosl 8.7

= 12.17 cosl 8.7

= 11.53 KN

N = Rsdnl 8.7

= 12.17 sinl 8.7

= 3.90 KN F = (DX CGEO X 1 + N x tan ^ GEO) / S

= (1.5 x 30.7 x 0.34 + 3.90 x tan 36.4) / ll. 53

= 1.61> 1.5 (Fs) OK w: Overall weight

Wl: Slip-through weight of surface soil

W2: Weight of continuous fiber reinforced soil

t: Construction thickness

7t: Unit of machine weight

7 t GEO: A unit operation valuable amount of continuous fiber reinforced soil

R: External force

S: Shear force acting on the sliding surface of continuous fiber reinforced soil

N: Vertical component force of continuous fiber reinforced soil

βΈ, :: Internal friction angle of continuous fiber reinforced soil

CGEO: Adhesive strength of fiber reinforced soil

L: Reinforcing bar reinforcement in the longitudinal direction

D: Horizontal reinforcing bar pitch (calculated with l. ⁵ m in the above calculation) F: Safety factor

F s: Design safety factor

It is.

The same applies to the case where the slope slope is 1: 1.4. α = Ω + 15 = 15 + = 30 degrees

W = W1 + W2

= {(hxd / 2) Xyt + Lxtx tGEO} Dx 1/2

= {(0.11 X 2.40 / 2) X 18.00 + 3.00 0.20 18.00} X 1.5 X 1/2 = 9 · 88ΚΝ

R = Wsin 33.7

= 0.99 sin 33.7

= 5.48 KN

S = Rcosl 8.7

= 5.48 cosl 8.7

= 5.19 KN

N = Rsdnl 8.7

= 5.48 sinl 8.7

= 1.76 KN F = (DXCGEO 1 + Nxtan <^ GEO) / S

= (1.5 x 30.7 x 0.57 + 1.76 x tan 36.4) /5.19

= 5.31> 1.5 (Fs) OK And, as mentioned above, the mass of fiber to be entangled and mixed with sandy soil lm ³ is 3.3 kg, and it is sufficient in the range of 2. 0-5.0 kg Because the strength of the reinforced soil is obtained, there is no need to use more fibers, and the cost can be reduced compared to using more fibers.

The example of rt my is an example, and the value changes according to the situation.

Furthermore, although not shown, before or after the sandy soil is introduced into the hopper 10, the conduits having a length of 10 cm or less are stirred together with the sandy soil in a stirring apparatus, and the sand soil is sprayed before being pumped. To Mix short fiber.

As the staple fiber, various fibers such as natural fiber and synthetic fiber can be used, but vinylon fiber and steel fiber can increase the strength of the fiber reinforced soil, and they have excellent permeability and air permeability. Water and oxygen can be supplied to the roots of plants, such as (1) and (2).

The presence of short fibers makes the reinforced soil bulky and increases the air layer in the reinforced soil, so that it becomes easy to supply oxygen to plant roots when applied 3⁄4 ^, which can promote plant growth . Furthermore, the fibers mixed in the reinforcing soil do not prevent the growth of plant roots, and in addition to strengthening the reinforcing effect of the soil by being entangled with the roots, by combining the continuous fibers and the short fibers, the short fibers become entangled with the continuous fibers. Can be expected to strengthen the reinforcement effect.

In addition, with regard to various bonding materials such as cement type, resin type and lime type, if necessary depending on the condition of the ground slope and the sandy soil to be used, it is added to the sandy soil in advance together with short fibers. The amount should be 5 O kg or less per 1 m ³ of sandy soil, and it may not be added if it is not necessary.

Although fiber reinforced soil ¾K production is good and 1 0 one ² ~ 1 0 _ ³ ^cmZs, sometimes it is difficult to keep the moisture and nutrients always performs E as shown in FIG. 9, 1 0 In some cases, it is desirable to embed a material that has both sex and fertilization properties near the surface of the reinforced soil.

Furthermore, place a pot 4 3 for holes such as a void tube in proximity to the material 4 2 having fck property and fertilization property, while making the tip of the pot 4 3 for planting holes come out of the surface of the reinforced soil, {Create a fiber reinforced soil 55 on a material 4 2 and a hole-porting material 4 3 having elasticity and fertility.

A commercially available material (for example, trade name "Green bullet No. 4") is used as the material 42 having water retention and fertilization properties, and a material having fcK properties and fertilizer retention and 42 for leakage holes Arrange the ports 4 3 at an interval of 2 pcs / m ² .

The material with fcK properties and fertilizer-retaining property is formed mainly of the organic material base material by peat moss and park compost, and for example, the prepared product is peat moss 3, pak-teok moon cake 5, Permikiyu light shall be compressed at a ratio of 0.5, Zeolite 0.5, Bentonite 0.5, Pearlite 0.5. The entire bowl may be in the form of a cylindrical square or the like. The size is about a height of 8 (cm), a diameter of 010 to 18 (cm), and a weight of about 400 to 1,300 (g).

In addition, when the shape of the structure created in this way is as gentle as N≥0.8 for ground slope 1: N, the ground slope is reinforced by fibers substantially uniformly with a thickness of 30 cm or more. For slope protection type covered with soil, use a concrete construction method such as concrete beam together with other constructions when there is a slight steep ^ as 0.8> N 5 0.5, and use the slope protection type. Or, I will make a retaining wall shape i dog type that will make the buttocks thicker.

Also in this case, fiber reinforced soil is created with a thickness of 30 cm or more from the viewpoint of strength. Also, as shown in Fig. 12, the slope slope of the ground slope is steep, and in the case of 0.5> N 0 0. 3 (eg 1: 0. 35), The slope of the finished surface of the fiber reinforced soil 55 is made to be less than 1: 0.5 by setting it as a retaining wall type.

In addition, depending on the type of plant, the thickness of reinforced soil that can be grown continuously varies, so 30 cm for grasses and 45 cm or more for shrubs and trees with medium height. It is preferable to use 60 cm or more as a standard for woody products.

After the formation of the fiber reinforced soil 55, as shown in FIGS. 13 and 14, plant seedlings 44 are planted without leaving any gaps in the holes 45 formed by removing the pot 43 for planting holes. After creating fiber reinforced soil 55, it is difficult to dig a hole for planting seedlings, but in this way, holes 45 for seedlings can be easily made.

Further, as shown in FIG. 15, after removing the sand remaining on the surface of the fiber reinforced soil 55, a thick layer substrate spraying is applied.

Thick-layer substrate spraying is performed by spraying a ffi ^ substrate to a thickness of 3 to 10 cm using a pump or a mortar gun, and the method may be artificial soil or organic powder (soil, wood fiber, raw water, Beat moss etc).

For example, the composition of thick-layer ax 46 per 1 m ³ is organic vegetation change 2000 liters, chemical 3k, slow-acting fertilizer 3 kg, resin-based powder 1 kg as an erosion inhibitor, Blend plant seeds according to greening goals.

In addition, depending on the composition of the seed, it may cover the seedlings 44, so consider using mulching material 39 in combination. The mulching material 39 is a natural fiber jut cloth backing a kraft paper, and has a ground temperature stability and feK property comparable to that of a laying straw, saves time for drying and watering, and prevents rising above the ground. Excellent.

Prior to greening by applying thick fiber 46, a mesh 70 such as a wire mesh or synthetic resin net is laid on the upper surface of the fiber reinforced soil 55.

The mesh 70 is locked at the hook 7 1 a of the head of the pin 7 1 which is inserted into the fiber reinforced soil 5 5. The outline of pin 7 la is shown in Fig. 17 A. It is made of fine material, has a pointed end, and the main body has a vertical lip that protrudes from the center as a cross-section cross-shaped or character-shaped. 7 1 b is provided, and upward ridges 71 c are formed at the upper and lower intervals at the side end of the longitudinal rib 7 lb. A cross section is shown in Fig. 17 B.

The pin 70 is light if it is made of synthetic resin and has a pointed tip so that it can be easily inserted. The main body is provided with a longitudinal rib that protrudes in a square shape from the center, such as a cross-shaped cross section. Therefore, the longitudinal ribs serve as reinforcements, and furthermore, the upward ridges entangle with the fibers, making it difficult to remove them.

Furthermore, a flat portion 7 I d for impact receiving is formed at the top of the pin 7 1 so that it can be driven. The pin 71 is arranged, for example, 1 8/1 O m ² about interval.

Pin 71 lays net 70 on fiber reinforced soil 55, and then inserts it in fiber reinforced soil 55, and finally locks mesh 7 1 a of net 4 on the head. In this way, the bifurcated fibers of the fiber reinforced soil 5 5 are entangled with the ridges 7 1 c of the pin 7 1 and the pin 7 1 can be prevented from coming out, and the mesh 70 and the fiber reinforced soil 5 5 The integral connection through the pin 8 and the reinforcement by the mesh 70 ensure stability against the crane section.

In addition, when thick laver 46 is applied on the fiber reinforced soil 55, the net 70 is floated a little on the fiber reinforced soil 5 and laid in the thick layer base 46 70 may enter. In the construction constructed by the above-mentioned fiber reinforced soil construction method, the material having the water retention ability and the fertilizer retention ability gradually supplies water and fertilizer to the plants, and the plants can grow well.

Since the reinforced soil of the construction constructed in this way has a thickness of 30 cm or more and the finishing slope slope is less than 1: 0.5 which is the growth limit slope of 3⁄44, the plant is healthy. It can grow on In addition, by the presence of an appropriate amount of fibers, it is possible to maintain the strength due to the cohesion and reinforce the ground.

Furthermore, as shown in Fig. 16, a rock bolt 90 is placed as a rigid body on the slope to create the fiber reinforced soil 55, and the upper end of the lock bolt 90 protruding from the slope is reinforced Covering with soil The so-called rock bolt is applied, and the rock bolt 90 is used to stabilize the ground and the end of the rock bolt 90 has one end placed on the slope to construct the fiber reinforced soil 55. Since the fiber is covered with a fiber reinforced soil 55, the fibers in the fiber reinforced soil 55 are entwined in the rock bolt 90 to improve the integrity of the reinforced soil and the ground slope, causing slippage and collapse. It becomes difficult to happen. Industrial applicability

As described above, in the fiber reinforced soil construction method of the present invention, in the fiber reinforced soil construction method in which the reinforced soil is constructed by entangled and mixed the fibers with the sandy soil, the mixing state of the fibers in the reinforced soil is appropriate. By laying the fibers in such a way, reinforced soil with sufficient strength can be obtained, and the working efficiency can be improved. In addition, the fiber reinforced soil construction of the present invention can be constructed with good workability, and is homogeneous and has sufficient strength.

Claims

The scope of the claims

1. Fiber using the fiber reinforced soil device equipped with a sandy soil transfer device for transferring sandy soil and a fiber supply device for supplying fibers continuously, the fiber is transferred to the sandy soil transferred from the sandy soil device In the fiber reinforced soil construction method, in which fibers are unwound from a feeder and mixed to form a reinforced soil, the fibers are entangled fibers, and the fiber reinforced soil construction method is characterized by linear orientation to sandy soil.

2. Connect the ejector that injects the fiber with high pressure water or compressed air and feeds it out to the high pressure water or compressed air supply pipe, and through this ejector, the direction of the fiber mixing from the fiber supply device to the sandy soil The fiber reinforced soil construction method according to claim 1, wherein the number is to be made into a receiving plate shape.

3. The fiber reinforced soil construction method according to claim 2, wherein the ejector is provided with a plurality of jet nozzles.

4. The fiber reinforced soil construction method according to claim 3, wherein the ejector comprises a combination of a header provided with a plurality of jet nozzles and a peristaltic means of the ejector.

5. The fiber reinforced earth construction method according to claim 3, wherein the receiving board has a height angle of 7 ° to 20 ° with respect to a horizontal plane intersecting the slope on which the reinforced soil is formed.

6. The jet speed of the fiber is 3 0 0 π! The fiber reinforced earth construction method according to claim 4, wherein the swing angle of the slider is 10 degrees to 30 degrees with respect to 1 to 1000 m / min.

7. A fiber reinforced soil construction method according to claim 1, wherein a rigid fiber is placed on a slope to construct a reinforced soil, and the upper end of the body projecting from the slope is covered with the reinforced soil.

8. A fiber reinforced soil structure constructed by the method according to claim 1.