KR20180123959A - Concrete for emergency maintenance and method for constructing thereof - Google Patents

Abstract

According to an embodiment of the present invention, provided is emergency maintenance concrete which comprises: rapid hardening concrete including rapid hardening cement to secure early strength, and deposited at an emergency maintenance position of a concrete package; and a mesh stiffener arranged inside the rapid hardening concrete to restrain a crack of the rapid hardening concrete from occurring, and formed in a mesh form with a natural fiber. Accordingly, since the mesh stiffener with the natural fiber is arranged in the rapid hardening concrete, the crack of the rapid hardening concrete can be restrained, thereby remarkably reducing the amount of using latex.

Description

TECHNICAL FIELD [0001] The present invention relates to a concrete for emergency repair and a method of constructing the same.

The present invention relates to an emergency repair concrete and a method of constructing the same, and more particularly, to an emergency repair concrete used for emergency repair of concrete packages by applying a mesh reinforcement formed of natural fibers, And an urgent repair concrete capable of reducing the use of latex to reduce costs, and a method of constructing the same.

The present invention is the result of research conducted under the support of the agriculture-industry technology development project of the Agency for Food, Agriculture, Forestry and Fisheries Technology Planning and Evaluation (316034-3).

Generally, latex modified quick-setting concrete using quick-speed cement is mostly used for urgent repair of concrete packages.

The above-mentioned quick-speed cement is a cement for ensuring sufficient strength in a short time, and the quick-speed concrete using the quick-speed cement is also advantageous in securing the early strength.

However, there is a high possibility that cracks are generated in the process of hardening of ultra fast speed concrete. If cracks are generated in the ultra fast speed concrete as described above, the permeability increases and the durability decreases.

In order to prevent this, a latex modified quick-speed concrete in which a polymer-based material, latex, was applied to ultra fast speed concrete was developed. However, in the case of latex modified quick-setting concrete, the cost of latex is very high, which is costly, and latex delays initial strength.

Therefore, the use of latex-modified quick-speed concrete with 15% of latex based on the weight of cement is used to alleviate some of the problems caused by the cost burden and delay in initial strength. However, since the problem of the cost burden and the delay of the initial strength is not completely solved, problems are continuously being raised when using latex modified quick-speed concrete.

Recently, a technique to add a fiber reinforcing material to ultra fast speed concrete has been researched and developed in order to suppress cracking and increase water tightness. Accordingly, the application amount of the latex used in the ultra fast speed concrete can be further reduced.

For example, in Korean Patent No. 10-1384592 (entitled "Environmentally friendly pellet type fiber reinforcing material for reinforcing concrete and its manufacturing method, date of registration: Apr. 04, 2014), in order to prevent cracking of concrete, Discloses an eco-friendly pellet type fiber reinforcing material for reinforcing concrete.

As described above, the technique of adding the fiber reinforcing material to the quick-speed concrete is difficult to apply the fiber reinforcing material directly at the construction site, and when the fiber reinforcing material is not sufficiently dispersed during the blending of the ultra fast speed concrete, There is a problem that arises.

Specifically, the fiber reinforcing material is required to be contained in a material such as cement. For example, it is possible to directly add fiber reinforcement at the site or to add cement fiber reinforcement in advance at the site when compounding ultra fast speed concrete. If the fiber reinforcement is not sufficiently dispersed in the material, So that the fibrous reinforcement is agglomerated. The aggregation of the fibrous reinforcement as described above may have adverse effects such as generation of cracks, increase in permeability, and decrease in strength of the ultra fast speed concrete.

Therefore, in the case of ultra fast speed concrete for emergency repair used for urgent repair of concrete packages, it is inevitable to develop a technique for preventing the fiber aggregation phenomenon when the fiber reinforcement is applied while reducing the amount of latex used. In addition, the conventional method of applying the fiber reinforcing material has a limitation in combining the quick-speed concrete for emergency repair using a mobile mixer.

An embodiment of the present invention provides an emergency repair concrete and a method of constructing the same that can reduce the amount of latex used and reduce the cost while suppressing the occurrence of cracks in the emergency repair concrete used for emergency repair of concrete packages.

In addition, the embodiment of the present invention provides an emergency repair concrete capable of fundamentally preventing the aggregation of fiber reinforcement and capable of smoothly mixing emergency concrete for repair using a mobile mixer, and a method of constructing the same .

In addition, the embodiment of the present invention provides an emergency repair concrete and a method of constructing the emergency repair concrete which can reinforce the emergency repair concrete three-dimensionally and can easily perform the construction of the emergency repair concrete.

According to an embodiment of the present invention, there is provided a high speed concrete comprising a very fast cement for securing early strength and placed at an emergency maintenance position of a concrete package, And a support anchor provided at the emergency maintenance position prior to the placement of the quick-speed concrete to arrange or support the mesh reinforcement in a desired form at the emergency maintenance position To provide an emergency repair concrete.

Accordingly, in the present embodiment, since the mesh reinforcement of the natural fiber is disposed inside the ultra-fast speed concrete, the generation of cracks in the ultra fast speed concrete can be suppressed, and the amount of latex used can be remarkably reduced .

The mesh reinforcement may be formed of natural hemp fiber, which is a hydrophilic natural fiber having a hydroxyl group on the surface thereof, to enhance adhesion with the ultra fast speed concrete.

The mesh reinforcement may be disposed at a plurality of different height on the support anchors or may be disposed on a plurality of support anchors formed at different heights so that a plurality of mesh reinforcement members are spaced apart from each other in the height direction of the ultra high speed concrete.

Wherein the mesh reinforcement comprises a lower mesh reinforcement disposed horizontally below the ultra speed concrete to contact the bottom surface of the emergency maintenance position and preventing adhesion failure occurring between the ultra speed concrete and the emergency maintenance position, An upper mesh reinforcement disposed horizontally on an upper portion of the ultra high speed concrete so as to be positioned on an upper surface of the emergency maintenance position and preventing a dent due to wear of the ultra high speed concrete, A plurality of intermediate mesh reinforcement members are disposed in the middle portion of the ultra high speed concrete to prevent internal cracks of the ultra high speed concrete.

At least one of the intermediate mesh reinforcement members may be arranged in the vertical direction or the oblique direction by the support anchors to correspond to cracking directions other than the horizontal direction among the internal cracks of the HSC concrete.

The rest of the intermediate mesh reinforcement members may be arranged horizontally by the support anchors so as to be parallel to the lower mesh reinforcement member and the upper mesh reinforcement member.

According to an aspect of the present invention, the mesh reinforcement may be formed to have a width corresponding to a placement area of the ultra high speed concrete, and may be disposed in a plane shape on the ultra high speed concrete.

According to an aspect of the present invention, the mesh of the mesh reinforcement may be formed in at least one of a circular hole, a polygonal hole, and an elliptical hole. The mesh size of the mesh reinforcement may be such that it passes the aggregate contained in the ultra fast speed concrete.

According to an aspect of the present invention, a plurality of the mesh reinforcement members may be spaced apart from each other in a height direction of the ultra high speed concrete. The number of the mesh reinforcement members may be determined according to the height of the ultra high speed concrete.

According to another aspect of the present invention, there is provided a method for repairing a concrete package, the method comprising the steps of: preparing an emergency repair position of a concrete package; installing a plurality of support anchors at the emergency maintenance position; Placing the lower mesh stiffener on a bottom surface of the emergency maintenance position, placing the quick-speed concrete at a first setting height at the emergency maintenance position where the lower mesh stiffener is disposed, Placing the intermediate mesh reinforcement material on the upper surface of the second velocity concrete of the first predetermined height by disposing the intermediate mesh reinforcement material on the upper surface of the second velocity mesh concrete reinforcement, To a second set height, placing an upper mesh beam Placing the upper mesh stiffener on the upper surface of the second velocity concrete of the second set height by disposing the ash concrete reinforcement on the upper surface of the second velocity concrete, And pouring.

According to still another aspect of the present invention, there is provided a method of constructing a concrete anchoring structure, comprising: performing a preparation work for an emergency maintenance position of a concrete package; installing a plurality of support anchors at the emergency maintenance position; The middle mesh reinforcement member and the upper mesh reinforcement member are disposed to place the lower mesh reinforcement member, the intermediate mesh reinforcement member, and the upper mesh reinforcement member apart from each other on the bottom surface of the emergency maintenance position, And installing the quick-speed concrete to the third set height at the emergency maintenance position where the intermediate mesh reinforcement and the upper mesh reinforcement are disposed.

The mesh reinforcement may be formed of natural hemp fiber, which is a hydrophilic natural fiber having a hydroxyl group on the surface thereof, to enhance adhesion with the ultra fast speed concrete. The mesh reinforcement may be disposed at a plurality of different height on the support anchors or may be disposed on a plurality of support anchors formed at different heights so that a plurality of mesh reinforcement members are spaced apart from each other in the height direction of the ultra high speed concrete.

Wherein the mesh reinforcement comprises a lower mesh reinforcement disposed horizontally below the ultra speed concrete to contact the bottom surface of the emergency maintenance position and preventing adhesion failure occurring between the ultra speed concrete and the emergency maintenance position, An upper mesh reinforcement disposed horizontally on an upper portion of the ultra high speed concrete so as to be positioned on an upper surface of the emergency maintenance position and preventing a dent due to wear of the ultra high speed concrete, A plurality of intermediate mesh reinforcement members are disposed in the middle portion of the ultra high speed concrete to prevent internal cracks of the ultra high speed concrete.

At least one of the intermediate mesh reinforcement members may be arranged in the vertical direction or the oblique direction by the support anchors to correspond to cracking directions other than the horizontal direction among the internal cracks of the HSC concrete. The rest of the intermediate mesh reinforcement members may be arranged horizontally by the support anchors so as to be parallel to the lower mesh reinforcement member and the upper mesh reinforcement member.

Here, the upper surface of the ultra high speed concrete having the third predetermined height may be formed to have the same height as the upper surface of the concrete package.

In the step of performing the preliminary preparation work, a cleaning operation and a cleaning operation for the emergency maintenance position, an operation for cutting the lower mesh reinforcement and the intermediate mesh reinforcement and the upper mesh reinforcement into a desired shape, It is possible to perform at least one of the operations of mixing the concrete.

The concrete for emergency repair according to the embodiment of the present invention and the method of constructing the same according to the present invention are structured such that the mesh reinforcement formed in the form of a mesh of natural fibers is disposed inside the quick speed concrete, It is possible to sufficiently suppress the occurrence of cracks in the concrete for use, and the toughness of the concrete for emergency maintenance is increased by the mesh reinforcement, so that the resistance against external impact or fatigue load can be sufficiently secured.

In addition, the concrete for emergency repair according to the embodiment of the present invention and the method of construction thereof suppress the occurrence of cracks in the concrete for emergency repair owing to the application of the mesh reinforcement, so that the use amount of the latex is greatly reduced, .

In addition, the concrete for emergency repair according to the embodiment of the present invention and the construction method thereof are constructed such that the mesh reinforcement is formed in the form of a mesh of natural fibers, so that the transportation, storage and handling of the mesh reinforcement are easier than those of the existing fiber reinforcement Unlike steel materials, the risk of corrosion can be reduced.

In addition, the concrete for emergency repair according to the embodiment of the present invention and the construction method thereof are structured such that the mesh reinforcement material cut into a proper shape is disposed at the emergency maintenance position and then the quick-speed concrete is laid. Therefore, It is possible to fundamentally prevent the aggregation phenomenon of the super fast velocity concrete using the mobile mixer. Therefore, in this embodiment, since the use of the mesh reinforcement material is easier than that of the existing fiber reinforcing material, the construction work of the concrete for emergency repair can be carried out very easily.

FIG. 1 is a view showing an emergency repair concrete according to an embodiment of the present invention.
FIG. 2 is a view showing the concrete for emergency repair shown in FIG. 1. FIG.
3 is a block diagram illustrating an example of a method of constructing an emergency repair concrete according to an embodiment of the present invention.
4 is a block diagram showing another example of a method of constructing an emergency repair concrete according to an embodiment of the present invention.
5 to 12 are graphs showing the results of performance tests of the emergency repair concrete and the existing emergency repair concrete according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

FIG. 1 is a view showing an emergency repair concrete 100 according to an embodiment of the present invention, and FIG. 2 is a view showing the emergency repair concrete 100 shown in FIG.

Referring to FIGS. 1 and 2, the emergency repair concrete 100 according to an embodiment of the present invention may include a quick-speed concrete 110 and a mesh reinforcement 120.

The emergency repair concrete 100 according to the present embodiment can be used to promptly repair the emergency repair position P where emergency repair is required when emergency repair is required in the concrete package 10. Here, the concrete package 10 is a pavement structure packed with a concrete material in a road, a square, a playground, and the like. Since the concrete pavement 10 as described above can not be controlled for a long time or causes a lot of inconveniences and complaints, the concrete pavement 10 according to the present embodiment can be quickly repaired in a short time by using the concrete 100 for emergency repair .

Hereinafter, in the present embodiment, for convenience of explanation, it is assumed that the concrete package 10 is a concrete road, and the emergency maintenance position P is recessed in a hexahedron shape on the concrete road. However, the present invention is not limited thereto, and the shape of the emergency maintenance position P may be variously formed to reflect the actual situation.

Referring to FIGS. 1 and 2, the ultra fast speed concrete 110 may be installed at an emergency maintenance position P of the concrete package 10. The quick-setting concrete 110 may include ultra fast cement capable of ensuring early strength so as to sufficiently secure strength in a short period of time.

That is, the quick-speed concrete 110 can be blended with ultra fast cement, sand, aggregate, water and the like. The above-described ultra fast speed concrete 110 can be directly blended in the field using a mobile knife.

Referring to FIGS. 1 and 2, the mesh reinforcement 120 may be formed in the form of a mesh of natural fibers. The mesh reinforcement 120 may be disposed inside the ultra speed light concrete 110 to suppress cracking of the ultra rapid light concrete 110. Therefore, it is possible to greatly reduce the amount of latex used because the occurrence of cracks in the ultra fast speed concrete 110 is suppressed by disposing the mesh reinforcement 120 in the ultra fast speed concrete 110. For example, in the present embodiment, the existing fiber reinforcing material can be omitted owing to the use of the mesh reinforcement 120, and the amount of the latex used is 5% of the weight of the cement Can be added.

Since the mesh reinforcement 120 is formed in the form of a mesh, the mesh reinforcement 120 may have a plurality of meshes 120a. The mesh 120a of the mesh reinforcement member 120 may be a mesh or mesh of a mesh, and may be formed in at least one of a circular hole, a polygonal hole, and an elliptical hole. That is, since the emergency repair concrete 100 according to the present embodiment is filled with the quick-speed concrete 110 on the meshes 120a of the mesh stiffener 120, the mesh reinforcement 120 and the quick- Can be very firmly and stably coupled.

The size of the mesh 120a of the mesh reinforcement 120 may be such that the aggregate contained in the ultra fast velocity concrete 110 passes through the mesh 120a. Therefore, when the ultra fast velocity concrete 110 is poured, the ultra fast velocity concrete 110 is transferred through the mesh 120a of the mesh reinforcement 120 because the aggregate has the largest particle size among the elements constituting the ultra rapid velocity concrete 110 It can flow freely.

The mesh reinforcement 120 may be formed in a planar shape and disposed in a planar shape within the ultra fast velocity concrete 110. Hereinafter, in the present embodiment, it is assumed that the mesh reinforcement member 120 is manufactured in a structure having a predetermined width and a long length, and then rolled in a roll shape to be stored, transported, or handled. Therefore, the mesh reinforcement member 120 can be formed by cutting to a width corresponding to the installation area of the quick-speed concrete 110 at the time of emergency repair of the concrete package 10.

The mesh reinforcement 120 may be formed of a hydrophilic natural fiber having a hydroxyl group on the surface thereof in order to enhance adhesion with the ultra fast speed concrete 110. In other words, the mesh reinforcement 120 may be formed of hydrophilic natural fibers. Since the hydrophilic natural fibers are generally excellent in adhesion performance with concrete, the ultra fast speed concrete 110 is stably supported by the mesh reinforcement 120 Can be reinforced. For example, the mesh reinforcement 120 may be formed of natural hemp fibers.

A plurality of mesh reinforcement members 120 may be spaced apart from each other in the height direction of the ultra fast speed concrete 110. [ The number of the mesh stiffeners 120 may be determined according to the height of the ultra fast speed concrete 110. That is, when the depth of the emergency repair position P for placing the quick-speed concrete 110 in the emergency repair of the concrete package 10 is very deep, more mesh reinforcement 120 can be disposed, 10, the mesh reinforcement 120 can be arranged less when the depth of the emergency maintenance position P for placing the ultra fast speed concrete 110 is extremely low.

For example, the mesh stiffener 120 may include a lower mesh stiffener 122, an upper mesh stiffener 124, and an intermediate mesh stiffener 126.

The lower mesh stiffener 122 may be disposed at the lower portion of the quick-speed concrete 110. The lower mesh stiffener 122 may prevent adhesion failure that may occur between the lower portion of the ultra fast speed concrete 110 and the bottom surface of the emergency maintenance position P. [

The upper mesh stiffener 124 may be disposed on the upper portion of the ultra-quick-strength concrete 110. The mesh reinforcement member 120 may be disposed on the ultra fast velocity concrete 110 so as not to be exposed on the upper surface of the ultra fast velocity concrete 110. The upper mesh reinforcement 124 may prevent the upper surface of the ultra fast speed concrete 110 from being broken due to abrasion.

The intermediate mesh reinforcement 126 may be disposed in the middle portion of the ultra high speed concrete 110. The intermediate mesh reinforcement 126 may prevent cracks generated in the ultra fast velocity concrete 110. In particular, a plurality of intermediate mesh reinforcements 126 may be arranged parallel to each other in the vertical direction according to the height of the ultra fast speed concrete 110 to be poured. However, the present invention is not limited to this, and at least one of the intermediate mesh stiffeners 126 may be disposed vertically or obliquely depending on the installation conditions of the emergency repair concrete 100 and the emergency maintenance position P have.

Referring to FIGS. 1 and 2, the emergency repair concrete 100 according to an embodiment of the present invention may further include a support anchor 130. The support anchor 130 is a structure for disposing or supporting the mesh reinforcement 120 in a desired form at the emergency maintenance position P. A plurality of support anchors 130 may be installed at appropriate positions of the emergency maintenance position P before the quick-speed concrete 110 is installed.

Meanwhile, the installation structure of the support anchor 130 according to the present embodiment can be applied to all structures used in existing anchors. Therefore, detailed description of the installation structure, installation method, and the like of the support anchor 130 will be omitted.

1, in the present embodiment, the support anchors 130 are installed vertically to the corners of the quadrangular bottom surface of the emergency maintenance position P, respectively, so that the lower mesh reinforcement 122 and the intermediate mesh reinforcement 122, The upper mesh reinforcement member 126 and the upper mesh reinforcement member 124 are all provided on the support anchor 130.

That is, the lower mesh reinforcement 122, the intermediate mesh reinforcement 126, and the upper mesh reinforcement 124 have corner portions at the lower portion of the support anchor 130 disposed at the four corners of the emergency maintenance position P, And upper portions, respectively. However, the present invention is not limited to this, and a supporting anchor 130 for disposing the lower mesh reinforcement 122, the intermediate mesh reinforcement 126, and the upper mesh reinforcement 124 may be separately provided.

A method of constructing the emergency repair concrete 100 according to an embodiment of the present invention will now be described. FIG. 3 is a block diagram showing an example of a construction method of an emergency repair concrete 100 according to an embodiment of the present invention. FIG. 4 is a schematic view of an emergency repair concrete 100 according to an embodiment of the present invention. Another example of a construction method is a block diagram shown.

First, an example of a construction method of the emergency repair concrete 100 according to an embodiment of the present invention shown in FIG. 3 will be described.

In the step S10 of carrying out the preparatory work, the preparatory work for the emergency maintenance position P of the concrete package 10 proceeds.

For example, in the step of performing the preliminary preparation operation (S10), the cleaning work and the cleaning work for the emergency maintenance position (P), the lower mesh reinforcement 122, the intermediate mesh reinforcement 126 and the upper mesh reinforcement 124, To the desired shape, or to blend the ultra fast-speed concrete 110 with the first-speed concrete.

Here, the cleaning work of the emergency maintenance position P is an operation for removing foreign substances, trash, and the like scattered around the emergency maintenance position P, and the cleaning work of the emergency maintenance position P is an emergency maintenance position P, Is a work for making the space of the quick-speed concrete 110 favorable to be laid.

The operation of cutting the lower mesh reinforcement 122 and the intermediate mesh reinforcement 126 and the upper mesh reinforcement 124 to a desired shape is performed by changing the roll shape of the mesh reinforcement member 120 are appropriately cut to secure the lower mesh reinforcement 122, the intermediate mesh reinforcement 126, and the upper mesh reinforcement 124.

In addition, the work of blending the quick-speed concrete 110 is a work of making a quick-speed concrete 110 by blending cement, sand, aggregate, latex, water and the like at a rapid speed in a mobile mixer.

In step S11 of installing the support anchor 130, a plurality of support anchors 130 are arranged in a space in the emergency maintenance position P in a suitable structure. The supporting anchor 130 is installed in a structure vertically protruding from the bottom surface of the emergency maintenance position P.

In the step S12 of disposing the lower mesh stiffener 122, the lower mesh stiffener 122 is positioned on the bottom surface of the emergency maintenance position P. To this end, the lower mesh stiffener 122 is connected to the lower portion of the support anchors 130 and is supported by the support anchors 130.

In the step S13 of placing the ultra fast speed concrete 110 to the first set height H1, the quick-speed concrete 110 is placed at the lower portion of the emergency maintenance position P where the lower mesh stiffener 122 is disposed, Place it up to the set height (H1). The first set height H1 is set to a height enough to cover the lower mesh stiffener 122 with the second speed concrete 110 and is set to a height for placing the intermediate mesh stiffener 126 do.

In the step S14 of disposing the intermediate mesh reinforcement member 126, the intermediate mesh reinforcement member 126 is positioned on the upper surface of the ultra rapid velocity concrete 110 at the first predetermined height H1. To this end, the intermediate mesh reinforcement 126 is connected to the intermediate portion of the support anchors 130 and is supported by the support anchors 130.

In the step S15 of placing the ultra fast speed concrete 110 to the second set height H2, the ultra fast speed concrete 110 is placed on the upper surface of the ultra fast speed concrete 110 in which the intermediate portion mesh reinforcement 126 is disposed. 2 Pour into setting height (H2). The second setting height H2 is set to a height enough to cover the intermediate mesh reinforcement 126 with the quick-speed concrete 110 and is set to a height for placing the upper mesh reinforcement 124 do.

In the step S16 of disposing the upper mesh stiffener 124, the upper mesh stiffener 124 is positioned on the upper surface of the second velocity concrete H2 at the second set height H2. To this end, the upper mesh reinforcement 124 is connected to the upper portions of the support anchors 130 and is supported by the support anchors 130.

In the step S17 of placing the ultra fast velocity concrete 110 to the third set height H3, the quick velocity concrete 110 is placed on the upper surface of the quick velocity concrete 110 in which the upper mesh stiffener 124 is disposed, Place it up to the set height (H3). The third setting height H3 is set to a height enough to cover the upper mesh stiffener 124 with the second speed concrete 110 and the upper surface of the second speed concrete 110 is set to a height enough to cover the concrete package 10, As shown in FIG.

Meanwhile, another example of the construction method of the emergency repair concrete 100 according to the embodiment of the present invention shown in FIG. 4 will be described as follows.

Step S20 of performing the preliminary preparation operation is the same as step S10 of performing the preliminary preparation work shown in Fig. 3, and step S21 of installing the support anchor 130 is the same as step S10 of Fig. (S11) of installing the light emitting diodes 130 in the first embodiment. Therefore, detailed description of these steps S20 and S21 will be omitted.

In the steps S22, S23 and S24 of arranging the lower mesh reinforcement 122, the intermediate mesh reinforcement 126 and the upper mesh reinforcement 124, the lower mesh reinforcement 122, the intermediate mesh reinforcement 126, The mesh reinforcements 124 are positioned so as to be spaced upward from the bottom surface of the emergency maintenance position P. The lower mesh reinforcement 122, the intermediate mesh reinforcement 126 and the upper mesh reinforcement 124 are connected to the lower portion, the middle portion and the upper portion of the support anchors 130 and are supported by the support anchors 130 do.

In the step S25 of placing the ultra fast speed concrete 110 to the third set height H3, the emergency maintenance position where the lower mesh reinforcement 122, the intermediate mesh reinforcement 126, and the upper mesh reinforcement 124 are disposed Speed concrete 100 is placed at the third predetermined height H3. Since the third set height H3 is substantially the same as the third set height H3 shown in FIG. 3, the description thereof will be omitted.

As described above, the method of constructing the emergency repair concrete 100 shown in FIG. 4 is different from the construction method of the emergency repair concrete 100 shown in FIG. 3 in that the installation work of the mesh reinforcement 120 and the quick- There is a difference in that the pouring operation of the heat exchanger 110 is carried out at one time. Accordingly, if the pouring space is formed in a simple shape like the emergency maintenance position P of the present embodiment, the work can be rapidly performed by the construction method shown in Fig. On the other hand, if the pouring space is formed in a complex shape different from the emergency maintenance position P of the present embodiment, the work can be progressed step by step by the construction method shown in FIG.

5 to 12 are graphs showing the performance test results of the emergency repair concrete 100 and the emergency repair concrete 100 according to an embodiment of the present invention.

Referring to FIGS. 5 to 12, the concrete 100 for emergency repair according to an embodiment of the present invention is indicated as 'latex 5% + net (development technology)'. That is, the emergency repair concrete 100 according to the present embodiment includes a mesh reinforcement material containing 5% of latex based on the weight of cement and formed in the form of a mesh of natural fibers.

The existing emergency repair concrete 100 is a latex modified quick-setting concrete 110 with a latex modified quick-setting concrete 110 and a fiber reinforcing material added thereto.

As shown in FIGS. 5 to 12, the conventional latex modified ultra high speed concrete 110 is represented by 'latex modification (latex 15%)'. That is, the conventional latex modified quick-setting concrete 110 contains 15% of latex based on the weight of cement, but does not have a mesh reinforcement or a fiber reinforcement formed in the form of a natural fiber net.

As shown in FIGS. 5 to 12, the latex modified quick-setting concrete 110 to which a conventional fiber reinforcing material is added is indicated as 'latex 5% + fiber reinforcing material'. That is, the latex modified quick-setting concrete 110 to which a conventional fiber reinforcing material is added contains 5% of latex based on the weight of cement and has a fiber reinforcing material inside.

5 to 12, various performance tests of the concrete for emergency repair were conducted under the same conditions, and the results are shown in a table.

FIG. 5 shows the result of testing the compressive strength, and the emergency repair concrete 100 according to the present embodiment shows better performance than the conventional concrete in terms of compressive strength.

FIG. 6 shows the result of testing the flexural strength, and it is shown that the emergency repair concrete 100 according to the present embodiment is superior to the conventional concrete in terms of the whip strength.

FIG. 7 shows the result of the test for the cleavage tensile strength, and the emergency repair concrete 100 according to the present embodiment shows better cracking tensile strength than other conventional concrete.

FIG. 8 shows the result of testing the adhesion strength, and it is shown that the emergency repair concrete 100 according to the present embodiment is superior to the conventional concrete in terms of adhesion strength.

FIG. 9 shows a result of testing chloride ion permeation resistance, and the emergency repair concrete 100 according to the present embodiment shows better performance against chloride ion permeation resistance than other conventional concrete. Therefore, the concrete 100 for emergency repair according to the present embodiment is the smallest in terms of the permeation amount of the combustion ions.

FIG. 10 shows the result of testing the wear depth, and it is shown that the emergency repair concrete 100 according to the present embodiment is superior to the conventional concrete in terms of the wear depth.

FIG. 11 shows the result of testing the resistance to freezing and thawing, and the concrete 100 for emergency repair according to the present embodiment is superior to the conventional concrete in terms of freezing and thawing resistance.

FIG. 12 shows the results of the test for drying shrinkage resistance, which indicates that the emergency repair concrete 100 according to the present embodiment is superior to the conventional concrete in terms of shrinkage resistance. Therefore, the emergency repair concrete 100 according to the present embodiment is the smallest in the length change during drying shrinkage.

Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

10: Concrete package
100: Concrete for emergency maintenance
110: High speed concrete
120: mesh reinforcement
122: Lower mesh stiffener
124: Upper mesh stiffener
126: Mid section mesh stiffener
130: support anchor
P: Emergency maintenance location
H1: First setting height
H2: Second setting height
H3: Third setting height

Claims (3)

Quick - speed concrete containing quick - setting cement for securing early strength and placed at the emergency maintenance position of concrete package;
A mesh reinforcement disposed inside the ultra high speed concrete to suppress the generation of cracks in the ultra high speed concrete and formed in the form of a mesh of natural fibers; And
And a support anchor installed at the emergency maintenance position prior to the placement of the ultra high speed concrete to arrange or support the mesh reinforcement in a desired form at the emergency maintenance position,
Wherein the mesh reinforcement is formed of a natural hemp fiber, which is a hydrophilic natural fiber having a hydroxyl group on the surface thereof in order to enhance adhesion with the ultra high speed concrete,
A plurality of the mesh reinforcement members are disposed at different heights or at a plurality of support anchors formed at different heights on the support anchors so that a plurality of the mesh reinforcement members are spaced apart from each other in the height direction of the ultra high speed concrete,
Wherein the mesh reinforcement is disposed horizontally below the ultra high speed concrete so as to contact the bottom surface of the emergency maintenance position and prevents adhesion failure generated between the ultra high speed concrete and the emergency maintenance position. An upper mesh reinforcement disposed horizontally on an upper portion of the ultra speed concrete so as to be positioned on an upper surface of the emergency maintenance position and preventing a dent due to wear of the ultra speed concrete; And an intermediate mesh reinforcement disposed at a middle portion of the ultra high speed concrete so as to be positioned between the upper mesh reinforcement and the lower mesh reinforcement to prevent internal cracking of the ultra high speed concrete,
At least one of the intermediate mesh reinforcement members is arranged in a vertical direction or an oblique direction by the support anchors so as to correspond to a cracking direction other than a horizontal direction among internal cracks of the ultra high speed concrete,
And the rest of the middle portion mesh reinforcement members are horizontally disposed by the support anchors so as to be parallel to the lower mesh reinforcement member and the upper mesh reinforcement member.
Performing a preliminary preparation work for the emergency maintenance position of the concrete package;
Installing a plurality of support anchors at the emergency maintenance position;
Placing a lower mesh reinforcement at a lower portion of the support anchors to place the lower mesh reinforcement at a bottom surface of the emergency maintenance site;
Inserting the quick-speed concrete to the first set height at the emergency maintenance position where the lower mesh stiffener is disposed;
Placing an intermediate mesh reinforcement at an intermediate portion of the support anchors to place the intermediate mesh reinforcement at an upper surface of the ultra high speed concrete at the first predetermined height;
Placing the ultra high speed concrete to a second predetermined height on the upper surface of the ultra high speed concrete in which the intermediate portion mesh reinforcement is disposed;
Placing an upper mesh stiffener on top of the support anchors to place the upper mesh stiffener on the upper surface of the second velocity concrete of the second set height;
And placing the ultra high speed concrete to a third predetermined height on the upper surface of the ultra high speed concrete in which the upper mesh reinforcement is disposed,
Wherein the mesh reinforcement is formed of a natural hemp fiber, which is a hydrophilic natural fiber having a hydroxyl group on the surface thereof in order to enhance adhesion with the ultra high speed concrete,
A plurality of the mesh reinforcement members are disposed at different heights or at a plurality of support anchors formed at different heights on the support anchors so that a plurality of the mesh reinforcement members are spaced apart from each other in the height direction of the ultra high speed concrete,
Wherein the mesh reinforcement is disposed horizontally below the ultra high speed concrete so as to contact the bottom surface of the emergency maintenance position and prevents adhesion failure generated between the ultra high speed concrete and the emergency maintenance position. An upper mesh reinforcement disposed horizontally on an upper portion of the ultra speed concrete so as to be positioned on an upper surface of the emergency maintenance position and preventing a dent due to wear of the ultra speed concrete; And an intermediate mesh reinforcement disposed at a middle portion of the ultra high speed concrete so as to be positioned between the upper mesh reinforcement and the lower mesh reinforcement to prevent internal cracking of the ultra high speed concrete,
At least one of the intermediate mesh reinforcement members is arranged in a vertical direction or an oblique direction by the support anchors so as to correspond to a cracking direction other than a horizontal direction among internal cracks of the ultra high speed concrete,
Wherein the rest of the intermediate mesh reinforcement members are horizontally disposed by the support anchors so as to be parallel to the lower mesh reinforcement and the upper mesh reinforcement.
Performing a preliminary preparation work for the emergency maintenance position of the concrete package;
Installing a plurality of support anchors at the emergency maintenance position;
The intermediate mesh reinforcement member and the upper mesh reinforcement member are disposed on the support anchors so that the lower mesh reinforcement member, the intermediate mesh reinforcement member, and the upper mesh reinforcement member are spaced upward from the bottom surface of the emergency maintenance position, ;
Placing the ultra fast speed concrete at the emergency maintenance position where the lower mesh reinforcement, the intermediate mesh reinforcement, and the upper mesh reinforcement are disposed up to the third predetermined height,
Wherein the mesh reinforcement is formed of a natural hemp fiber, which is a hydrophilic natural fiber having a hydroxyl group on the surface thereof in order to enhance adhesion with the ultra high speed concrete,
A plurality of the mesh reinforcement members are disposed at different heights or at a plurality of support anchors formed at different heights on the support anchors so that a plurality of the mesh reinforcement members are spaced apart from each other in the height direction of the ultra high speed concrete,
Wherein the mesh reinforcement is disposed horizontally below the ultra high speed concrete so as to contact the bottom surface of the emergency maintenance position and prevents adhesion failure generated between the ultra high speed concrete and the emergency maintenance position. An upper mesh reinforcement disposed horizontally on an upper portion of the ultra speed concrete so as to be positioned on an upper surface of the emergency maintenance position and preventing a dent due to wear of the ultra speed concrete; And an intermediate mesh reinforcement disposed at a middle portion of the ultra high speed concrete so as to be positioned between the upper mesh reinforcement and the lower mesh reinforcement to prevent internal cracking of the ultra high speed concrete,
At least one of the intermediate mesh reinforcement members is arranged in a vertical direction or an oblique direction by the support anchors so as to correspond to a cracking direction other than a horizontal direction among internal cracks of the ultra high speed concrete,
Wherein the rest of the intermediate mesh reinforcement members are horizontally disposed by the support anchors so as to be parallel to the lower mesh reinforcement and the upper mesh reinforcement.

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