KR20170011117A - Construction and Reinforcement Method of Fiber Reinforcing Bands Prevented from Being Damaged by Filled-up Material - Google Patents

Abstract

The present invention relates to a construction method for a fiber reinforcement material, capable of preventing a fiber reinforcement material from being damaged due to compaction of a back-filling material by placing a polyurea synthetic resin protecting the fiber reinforcement material on an upper and a lower surface or the upper surface of the fiber reinforcement material installed in a mounding material. According to the present invention, the construction method for the fiber reinforcement material comprises: a step of erecting a pacing material (10) on a front side of the back-filling material (G) placed to form a reinforced earth body (R); a step of placing the fiber reinforcement material (30) connected to the pacing material (10) on the back-filling material (G); a step of placing the polyurea resin on the placed fiber reinforcement material (30), and hardening the polyurea resin at least for a tack-free time; and a step of placing and compacting the back-filling material (G) to a predetermined height after placing the polyurea resin.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a method for reinforcing fiber reinforcement,

The present invention relates to a method of constructing a reinforcement material for reinforced earth retaining walls, and more particularly, to a method of constructing a reinforcement material for a reinforced earth retaining wall by providing polyurea synthetic resin for protecting a fiber reinforcing material on the upper or upper surface of a fiber reinforcing material To a construction method capable of preventing breakage of a fiber reinforcing material.

The reinforced soil structure is generally composed of a reinforcing material, a pacing material, and a backfill material (filler). The reinforcing material is the most important component in the reinforced soil structure and forms the reinforcing soil of the gravity type retaining wall concept by interaction with the backfill material. These stiffeners are installed in the soil with a density based on the thrust of the soil which is reacted by the stress acting on the structure and the friction between the soil-stiffener.

Considering the durability and workability of the reinforced soil, sandy soil with a low silt or clay content is considered to be suitable for embankment used for backfilling of reinforced earth retaining wall. However, in the field, there are various backfill materials besides sandy soil.

Depending on the durability of the reinforcement, the range of backfill materials that can be used can vary greatly. For example, the better the workability of the reinforcement material, the wider the range of backfill materials that can be used.

In general, a bonded type geogrid in which polyester (PET) fiber yarns are arranged in a net shape and coated with PVC has a weak strength, so that it is necessary to use a relatively small and smooth backfill material while a plurality of polyester The so-called folded-fiber reinforcing material, which is a type of polyethylene (PE) coated fiber bundle of PET yarn, has a higher strength than geogrid, .

That is, in the case of geogrid, since the width and thickness of the ribs in the direction of the 糸 가 are small to about 5 to 7 mm and the coating is also thin, there is a high possibility that the yarn is damaged during the reinforcing soil and the tensile strength of the reinforcing material is decreased due to such damage , The fiber reinforcing material (such as "FOLDLOCK" product of HANPHOUS CO., LTD.), The width of the reinforcing material is as wide as 70 mm and the covering material is thickly coated. Therefore, the possibility of damaging the yarn during the construction can be greatly reduced, The possibility that the tensile strength of the steel sheet is reduced can be greatly reduced. Thus, the thickness of the cladding material is closely related to the prevention of damage to the fiber reinforcement.

For example, in the case of a reinforcing material having a large diameter and a hard backfill material such as an amber stone or an amber buckle, a covering material covering a bundle of fiber yarns such as a fiber reinforcing material such as a "FOLDLOCK", rather than a geogrid-like reinforcing material, It can be said that the effect of reducing the tensile strength loss is small because the tensile strength reduction factor is small due to the small damage of the reinforcing fiber. Conversely, this means that a relatively wide variety of backfill materials can be utilized.

On the other hand, backfill materials are mainly used in the field when constructing embankment. There is no major problem in the case that the material in such a site is made of relatively small-diameter gravels. However, when the material of the site is composed mainly of rock such as gravel, amber stone, rock burr, etc., do.

That is, in the case where a fiber reinforcing material is laid on the upper surface of the reinforced soil material up to a certain height and a backfill material is laid on the fiber reinforcing material, when the backfill material is mixed with a lot of gravel, Whereby the covering material and the fiber core of the fiber reinforcing material are broken. If the fiber reinforcement is broken, the tensile strength of the fiber reinforcement is reduced, and the fiber reinforcement is likely to break without being able to withstand the earth pressure originally designed.

Thus, a fiber reinforcing material in which a reinforcing member is integrally attached to the surface of a covering material of a fiber reinforcing material and a manufacturing method thereof have been proposed. However, this increases the manufacturing cost of the fiber reinforcing material and raises the overall construction cost. The stainless steel mesh, the nonwoven fabric, and the high strength yarn, which are proposed in the above, can not sufficiently absorb the impact applied to the fiber reinforcing material when the rock mixed with the backfill material is mixed or transmit the impact to the fiber reinforcing material. It may be worse than not being used or rather not using it.

Also, when the fiber reinforcing material is manufactured in this way, it is difficult to apply the fiber reinforcing material because it is necessary to use an expensive fiber reinforcing material even if it is not necessary to consider the breakage of the fiber reinforcing material due to the impact due to relatively good backfill materials in the actual field. In addition, even if it is the same site, the diameter and the composition ratio of the backfill materials to be used are constantly changing as the embankment is constructed. The use of the fiber reinforcing material corresponding to the character of the backfill material, which is the worst condition among them, Resulting in an increase in cost.

Patent Registration No. 1534541 Patent Registration No. 0913423

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of fabricating a fiber reinforcing material capable of preventing breakage of a fiber reinforcing material even when gravel or rock is contained in a backfilled material.

It is another object of the present invention to provide a method of fabricating a fiber reinforcing material that can be flexibly applied according to the condition of a backfill material in the field.

In order to solve the above-described problems, the present invention provides a method of manufacturing a reinforcing soil (R), comprising: laying a pacing member (10) on a front surface of a backfill material (G) Laying a fiber reinforcement (30) connected to the pacing member (10) on the backfill material (G); Laying a polyurea resin on the fiber reinforcement 30 and curing the fiber reinforcement 30 for at least a touch dry time; And a step of laying up the filler (G) up to a predetermined height after the polyurea resin is installed, thereby providing a method of constructing the fiber reinforcement.

Laying backfill material on the laid polyurea resin can be made after the touch dry time of the polyurea resin.

The method may further include the step of curing the polyurea resin after curing the polyurea resin.

And the backfill material is laid on the laid polyurea resin after the curing drying time of the polyurea resin.

Also, the backfilling material is laid on the laid polyurea resin after the toughening time of the polyurea resin, and the compaction of the filled material can be performed after the curing drying time of the polyurea resin.

The method may further include the step of laying a polyurea resin on a portion of the backfilling material G where the fiber reinforcing material is to be spread, before the fiber reinforcing material 30 is spread on the backfill material G installed. The laying operation of the fiber reinforcement 30 may be performed after the toughening time of the polyurea resin laid on the backfill material G has elapsed.

The polyurea resin may be laid by a two-component impingement mixing spray gun.

The surface of the fiber reinforcing member 30 can be roughened.

Further, the present invention provides an embankment which is constructed by the above-mentioned method of applying the fiber reinforcing material.

According to the present invention, even when gravel or rock is contained in the backfilled material, it is possible to prevent breakage of the fiber reinforcing material, thereby ensuring the stability of the embankment.

In addition, according to the present invention, it is possible to apply flexibly according to the state of the backfill material in the field, thereby minimizing the construction cost.

In addition, the present invention enables quick construction without extending the construction period as compared with the existing construction method.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a perspective view showing a state in which a pacing member is installed on a front surface of a buried soil layer to form a reinforcing soil body up to a predetermined height;
2 is a perspective view showing a state in which a polyurea resin is laid on the embankment layer,
3 is a view showing a state in which a fiber reinforcement inserted in a pacing member is laid out on a polyurea resin laid on an embankment layer,
FIG. 4 is a perspective view showing a state in which a polyurea resin is laid on the fiber reinforcing material of FIG. 3,
FIG. 5 is a perspective view showing a state in which a back filler is filled in a space behind the pacing member of FIG. 4;
FIG. 6 is a conceptual diagram of the equipment used to install the polyurea resin, and
7 is a side cross-sectional view of the embankment formed by the method of applying the fiber reinforcement according to the present invention.

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

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

The present invention is characterized in that reinforcement of a fiber reinforcing material is performed only when reinforcing is required according to the field situation, without the necessity of integrally forming a reinforcing portion reinforcing the fiber reinforcing material in the fiber reinforcing material. However, when reinforcing fiber reinforcements in the field, if skilled personnel are required in the reinforcement work, or if the construction period is delayed due to the reinforcement work, there is no advantage in comparison with the method of integrally forming the reinforcement portion when producing the fiber reinforcement.

However, according to the method of the present invention, it is not necessary to provide a skilled person in the field reinforcement work of the fiber reinforcement, and the embankment is formed more firmly than when the fiber reinforcement and the reinforcement are integrally formed can do.

Fig. 1 is a perspective view showing a state in which a pacing member is installed on the entire surface of an embankment layer provided for constructing a reinforcing soil, Fig. 2 is a perspective view showing a state in which a polyurea resin is laid on the embankment layer, Fig. Fig. 4 is a perspective view showing a state in which a polyurea resin is laid on the fiber reinforcing material of Fig. 3, Fig. 5 is a perspective view showing a state in which the polyurea resin is laid on the fiber reinforcing material of Fig. FIG. 6 is a conceptual view of a device used for laying a polyurea resin, and FIG. 7 is a side sectional view of embankment constructed by the method of applying a fiber reinforcement according to the present invention.

≪ Embodiment 1 >

As shown in FIG. 1, a method of constructing a fiber reinforcing material according to the present invention includes first, second, and third pacing members 10 connected to a front surface of a backfill material G, which is installed to construct the reinforcing soil body R. After filling, the filling material (G) is well compacted by the compaction process.

Next, as shown in FIG. 2, a polyurea resin 40 is installed on a certain portion of the upper surface of the embankment layer G. As shown in FIG. The area where the polyurea resin is laid is the area where the fiber reinforcement is spread in the step of laying the fiber reinforcing material to be described later. As will be described later, the polyurea resin is relatively free to pass moisture, so that it can be laid up to all areas on the embankment layer as well as the laying area of the fiber reinforcement.

The polyurea resin is a reaction product of an isocyanate with a polyether having a primary amine at the terminal, and polyetheramine is used as a raw material. This resin is 100% solids and has no volatile components. Therefore, it is possible to apply even a conventional mask without wearing a respirator to prevent volatile organic compounds (VOCs) when working in the field. In addition, installation work can be done by spray method. Therefore, construction is relatively simple.

Since polyurea resin uses a primary amine, it is very fast in reactivity and curing speed without catalyst, homogeneous in reactivity, and is not influenced greatly by humidity and temperature changes. Therefore, regardless of weather conditions or environment, (Possible temperature for operation: -40 to + 135 ° C). Particularly, a mixed amine prepared from a chain extender having an amine group at the terminal and an amine group at the terminal thereof, and a polyurea resin prepared from an isocyanate prepolymer as a raw material have a very fast reaction speed and a fast curing type. Therefore, when the quick-setting polyurea resin is used through adjustment of the component, it is possible to reinforce the fiber reinforcement without substantially affecting the construction period.

In addition, since the polyurea resin has excellent adhesion to various adherends such as iron plate, aluminum, and concrete, the fiber reinforcing material reinforced by the polyurea resin adheres very closely to the backfill material of the reinforcing material in contact therewith, Can be maximized.

 Also, the polyurea resin has excellent water vapor permeability, so that even if the polyurea resin is placed inside the reinforcing soil, it does not significantly affect the movement of water contained in the reinforcing soil.

Above all, polyurea resin has excellent mechanical properties under extreme conditions and durability over a long period of time. Therefore, polyurea resin is an optimum material for reinforcing fiber reinforcement. That is, since the polyurea resin is very excellent in stretch ratio, impact resistance and abrasion resistance, it has a very excellent effect of reinforcing fiber reinforcing materials that are impacted by gravel or rocks contained in backfill materials.

In addition, since the polyurea resin has a stable chemical structure that is hardly influenced by acid, base, temperature, humidity, pressure, etc., the placement of the polyurea resin does not adversely affect the environment.

When the polyurea resin is installed, the apparatus shown in the conceptual view shown in Fig. 6 can be used. The polyurea resin can be laid through the spray gun 66 by mixing the base 61 and the curing agent 62. [ The subject 61 is made of an isocyanate component, and the curing agent 62 is made of a mixed amine. When the trigger of the spray gun 66 is pulled, the subject 61 and the curing agent 62 are introduced into the impingement mixing spray machine 64 through the transfer pumps 63 and then heated to about 70 캜 by the preliminary heater 65 And is delivered to the spray gun 66 so as to be mixed and injected at a high pressure. The discharge amount of the polyurea resin through the spray gun is about 2 to 10 kg / min and the discharge pressure can be 130 to 210 kgf / cm ² .

As shown in FIG. 2, when the polyurea resin is laid on the reinforcing soil G, the polyurea resin has a gel time of about 3 to 5 seconds, so that the polyurea resin can be adhered to the rugged reinforcing soil without flowing down.

Next, as shown in Fig. 3, a band-shaped fiber reinforcing member 30 fitted to the reinforcing material insertion port 20 of the pacing member 10 is laid on the polyurea resin laid on the reinforcing layer.

It is preferable that the fibrous reinforcement is worn after the toughening time of the polyurea resin has elapsed and before the curing drying time has elapsed. The composition of the polyurea resin can be adjusted so that the touching time is only about 30 seconds to 1 minute, and the curing time is about 1 hour. A worker can then lay the polyurea resin on the embankment layer, followed by another worker to unfold the fiber reinforcement onto the subsequently touched polyurea resin. In other words, the operations of FIG. 2 and FIG. 3 can proceed simultaneously with a time difference. According to such a construction method, reinforcement using polyurea resin is possible without any difficulty, and the construction time is not delayed.

Further, in the present invention, the polyurea resin (40) is laid on the polyurea resin before the curing drying time passes, and since the curing drying time is about 1 hour, there is no problem in adjusting the working time. That is, when a worker puts a polyurea resin on a reinforcing soil body, and then another worker spreads a fiber reinforcing material on the polyurea resin which is touch-dried successively at a small distance, the polyurea resin Fiber reinforcement can be laid within the curing drying time.

As described above, if the fiber reinforcing material is placed before the tack-free drying time has elapsed and the curing drying time has elapsed, the polyurea layer before being yet cured without damaging the polyurea layer, And is cured while being deformed corresponding to the surface shape of the fiber reinforcing material of Fig. According to this method, the polyurea resin layer 40 acts to increase the adhesive force between the back filling material G and the fiber reinforcing member 30, while the polyurea layer is not damaged and the impact resistance can be maintained.

Next, the polyurea resin 40 is placed on the fiber reinforcing member 30 laid out as shown in Fig. The polyurea resin 40 may be laid only so as to cover the fiber reinforcing material 30 and need not cover the entire surface of the embankment layer G. [ The position of the fiber reinforcement 30 to be installed can not be precisely confirmed in the work of FIG. 2, so that it is more convenient to work with a relatively wide polyurea resin to be installed. However, the polyurea resin It is easier to lay the fiber reinforcing member 30 so as to cover it.

Then, as shown in FIG. 5, the fiber filler 30 is filled with the backfill material. Here, the backfill material is filled, as described above, after the polyurea resin has passed the touch-drying time and before the curing-drying time has elapsed. According to this method, the polyurea resin layer (40) acts to increase the adhesive force between the filler layer (G) and the fiber reinforcing material (30) while the polyurea layer is not damaged and can maintain the impact resistance.

Also, according to this method, a worker can lay the polyurea resin on the reinforcing soil body, and subsequently fill the backfill with heavy equipment on the touch-dried polyurea resin.

After filling the backfill material with the backfill material, the backfill material can be subjected to compaction after the curing and drying time of the embedded polyurea resin 40 has elapsed. Since the buried polyurea resin 40 is in a cured state, even when the gravel or rock in the reinforcing soil G impacts the fiber reinforcing member 30 during the compaction operation, the polyurea resin 40 Absorb and resist. Since the polyurea resin 40 is excellent in the expansion / contraction ratio, high impact resistance and excellent abrasion resistance, the polyurea resin 40 is elastically deformed accordingly and is not destroyed even when the embankment layer is unevenly set during or after the compaction. Even when the gravel or rock having a large load acts on the fiber reinforcing member 30 in the collapsing operation, the fiber reinforcing member 30 is absorbed by the polyurea resin layer 40 and is not damaged.

After the operation of FIG. 5 is completed, the operations of FIG. 2 to FIG. 5 are repeated to fill the embankment with the required height to complete the embankment as shown in FIG.

≪ Embodiment 2 >

In the first embodiment, the polyurea resin 40 is provided on the upper and lower surfaces of the fiber reinforcing member 30, respectively. However, the polyurea resin installation work (see FIG. 2) installed in the lower surface of the above can be omitted. In FIG. 1, since the reinforcing soil G is already in a state in which the compaction operation is completed and the degree of smoothness is secured to some extent, the lower surface of the fiber reinforcing member 30 can be prevented to some extent It is because.

≪ Third Embodiment >

On the other hand, when the size of the gravel or rock mixed with the backfill material is considerably large or the proportion of the gravel or rock is high, after the curing drying time of the polyurea resin laid on the fiber reinforcing material 30 has elapsed, And may make compromises. This is a method that can be applied when there is a risk that the fiber reinforcement will be damaged by simply installing a backfill material because the ratio of the gravel or rock to the backfill material is high.

As described above, according to the construction method of the present invention, it is possible to determine whether or not the fiber reinforcing material is reinforced according to the composition of the backfill material used in the field, and also, in response to the concrete composition of the backfill material, Whether it is flexible or diverse. It is possible to determine whether the polyurea resin is installed or not according to the nature of the backfill material on the surface of the embankment layer to which the fiber reinforcing material will be laid, It can be applied immediately in various fields.

In addition, according to the structure constructed by such a method, the frictional force between the fiber reinforcement material and the backfill material can be remarkably increased as well as the breakage of the fiber reinforcing material can be prevented, and the stability of the structure can be greatly enhanced. Therefore, it is possible to reduce the length of the fiber reinforcing material to be embedded in the reinforcing soil after the stability of the fiber reinforcing material is verified to some extent. Therefore, when the method of the present invention is compared with the conventional method of fabricating the fiber reinforcing material, This can be an opportunity to reduce costs.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed exemplary embodiments. It is obvious that a transformation can be made. Although the embodiments of the present invention have been described in detail above, the effects of the present invention are not explicitly described and described, but it is needless to say that the effects that can be predicted by the configurations should also be recognized.

10: Facing member (panel, block, etc.)
12: Rear
20: Stiffener inlet
30: Fiber reinforcement
40: polyurea resin
61: Topics
62: Hardener
63: Feed pump
64: Impact mixing spray machine
65: spare heater
66: Two-component impingement mixing spray gun
G: Embankment (embankment, backfill)
R: Reinforcing material

Claims (10)

Setting a face member (10) on the front surface of the filler material (G) installed to form the reinforcing body (R);
Laying a fiber reinforcement (30) connected to the pacing member (10) on the backfill material (G);
Laying a polyurea resin on the fiber reinforcement 30 and curing the fiber reinforcement 30 for at least a touch dry time; And
And filling the back filler (G) to a predetermined height after the polyurea resin is installed.
The method according to claim 1,
Wherein the operation for laying backfill material on the laid polyurea resin is carried out after a toughening time of the polyurea resin.
The method according to claim 1,
Wherein the polyurea resin is installed and cured for a curing drying time.
The method of claim 3,
Wherein the laying of the backfill material on the laid polyurea resin takes place after a curing drying time of the polyurea resin.
The method of claim 3,
The laying of the backfill material on the laid polyurea resin takes place after the touch dry time of the polyurea resin,
Wherein the compaction of the filled filler is performed after a curing drying time of the polyurea resin.
The method according to claim 1,
Characterized in that polyurea resin is laid on the filler (G) site after at least a fiber reinforcement is laid before laying the fiber reinforcement (30) on the filled filler (G).
The method of claim 6,
Wherein the laying work of the fiber reinforcing material (30) is performed after a toughening time of the polyurea resin laid on the backfilling material (G) has elapsed.
The method according to claim 1,
Wherein the polyurea resin is laid by a two-impingement impingement spray gun.
The method according to claim 1,
Wherein the surface of the fiber reinforcing member (30) is subjected to a roughing treatment.
The embankment constructed by the method of any one of claims 1 to 9.

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