KR101701089B1 - Method of repairing and reinforcing damaged part of concrete structure using assemblable anchor and panel - Google Patents

Abstract

The present invention relates to a method of repairing and reinforcing a damaged part of a concrete structure using an assembled anchor and a panel, and more particularly, to a method of stably repairing and reinforcing a damaged part of a concrete structure using an assembled anchor and a panel which can be installed immediately in the field according to a size and a depth of a cross section of a target to be repaired when repairing broken parts of concrete structures in water or onshore due. By using the method according to the present invention, it is possible to minimize the inconvenience of a field worker since plastering work is not required, and in case of an underwater structure, a diver can only fix an anchor base to the damaged section of the anchor base by a simple method when fixing the anchor, and then simply insert an anchor bar (anchor rod) to maximize the convenience of an operation. In addition, a mortar filling material is injected from the outside and hardened without requiring any additional plastering work, so that the repair and reinforcement work can be completed, thereby improving the efficiency of the work, and by using a panel, it is possible to ensure internal restraint of the filling material and prevent an outer diameter of a structure from being enlarged after the repair work. Moreover, in repairing and reinforcing the damaged part of the underwater structure, it is necessary to use a proprietary water-exclusive mortar material having excellent properties such as compressive strength while maintaining the properties required for quick hardening, material non-separating property and high flowability so that a maintenance effect is maintained for a long time.

Description

Technical Field [0001] The present invention relates to a method of repairing and repairing damaged portions of a concrete structure using an assembled anchor body and a panel,

The present invention relates to a method for repairing and repairing a damaged portion of a concrete structure using an assembled anchor body and a panel, and more particularly, to a method of repairing a damaged portion of a concrete structure, And a technique capable of stably repairing and reinforcing by a simple method using an assembled anchor body and a panel that can be installed instantly in the field depending on the size.

Concrete structures are subjected to various natural or artificial actions after construction, resulting in physical performance deterioration due to physical and chemical deformation depending on the service years. Especially, in recent years, there has been an increasing effort to restore safety and functionality by carrying out maintenance in terms of securing safety and performance of construction structures. When the aging phenomenon of the construction structure accelerates, it causes the sectional defects in the structure, that is, the concrete due to the expansion pressure caused by the corrosion of steel bars, freezing and thawing, and carbonation phenomenon, Which can cause problems.

Therefore, in order to secure the stability and performance of the reinforced concrete structure, it is necessary to perform maintenance and reinforcement at the beginning of deterioration to further suppress the deterioration progress and improve the durability performance.

In order to restore the section to its original performance and shape after repairing the concrete structure, it is necessary to repair the section by repairing the section by the deterioration factors such as deterioration of the concrete, corrosion of the steel, It is a common practice to repair the material by filling or spraying it.

On the other hand, the bottom portion of an underwater concrete structure such as a pier of a bridge, a bridge of various bridges installed in a river, a river, or a sea is damaged due to flooding due to flood due to algae, (20) is generated and poses a risk to the stability of the structure. (See Fig. 1)

Therefore, it is necessary to repair and reinforce underwater concrete structures (usually concrete foundation structures) when such structural damage occurs.

Conventionally, as a method of repairing a damaged portion of an underwater concrete structure, a method of chipping a damaged portion and fixing an anchor bolt, and then finishing a repair mortar (for example, a water-exclusive mortar) is used.

The anchor bolts used in the existing repair work are manufactured by attaching the anchor bars integrally to the anchor body by the mechanical welding method. Therefore, the anchor bars are often dropped during the operation at the welded part. In addition, There were occasions when the anchor bar was missing because it was caught by a knife and inconvenienced the plaster work. If the anchor bar is missing, it is difficult to secure the substantial supporting force and the bonding strength, so that the maintenance effect is difficult to be maintained for a long time, and the possibility of the secondary breakage from the portion far from the anchor becomes large.

Related prior arts include Korea Patent Publication No. 10-2009-0095204, Korean Patent No. 10-0300230, Korean Patent No. 10-0999354, Korean Patent No. 10-1528120, and the like.

Korean Patent Laid-Open No. 10-2009-0095204 discloses a technique for scouring and repairing an underwater concrete structure. In view of scouring degree and degree of deterioration of a foundation structure, a rail guide is installed at a predetermined interval on the outer peripheral surface of the foundation structure, The outer surface of the foundation concrete is expanded and reinforced by a method of installing the attachment plate closely to the foundation or the foundation structure itself or installing it as a gap spacing at a constant interval or installing a mold for a mold and injecting grouting material only to the scour portion This study suggests a technique to increase the durability, load bearing capacity and bearing capacity of the plant structure. However, this technique requires an anchor to be installed inside the attachment plate before grouting material is injected, and since reinforcing steel is required to be inserted into the anchor, the degree of improvement is not so great.

In addition, Korean Patent Registration No. 10-0300230 discloses a method of repairing a scour portion of an underwater structure by injecting mortar or the like in a fluidized state inside a fiber bundle made of geosynthetic fiber formwork. In this technique, a scouring repair fiber bundle is installed on the surrounding scour portions of underwater foundation structures such as bridge piers, alternating scaffolds, etc., and injection materials such as mortar are injected into the scour repair fiber bundle through the injection port. To prevent the occurrence of additional scouring by repairing the scour by placing the cured fiber to bag. However, in the case of the geosynthetic fiber formwork used in this technique, it is difficult to maintain a certain shape due to underwater work, so that when the injection material such as mortar is injected from the outside, complete close injection is difficult to be performed.

In addition, in Korean Patent No. 10-0999354, the shrinkage expansion rate is lowered by using the artificial marble waste powder, the cement sludge, the phosphate cement paste or the flue gas desulfurization cement, This study suggests mortar for repair and reinforcement of concrete structure which can induce quick hardening, quick hardness, quickness of work and economical efficiency.

In addition, Korean Patent Registration No. 10-1528120 discloses that the physical properties such as bending strength, tensile strength and compressive strength can be maintained high while repairing and reinforcing a damaged concrete structure, and excellent adhesion to concrete structures, It is excellent in waterproof property, and also has excellent resistance to salting and shielding of radioactivity. Especially, it is excellent in storage stability because it does not harden even in long-term storage, and since each component is separated and mixed before use, This study suggests the repair and reinforcement method of reinforced concrete structure and the concrete structure using the reinforced concrete structure with properties that can be used in the field without any material loss and environmental pollution.

However, the techniques disclosed in the previously proposed patents may have the effect of achieving a predetermined purpose by changing the material composition in repairing and reinforcing the damaged portion of the concrete structure, but it is not related to the physical adhesion strength improving method In particular, there has been no proposal for a technique for eliminating inconveniences during rebar anti-rusting and cross-sectional restoration work, and actively responding to the broken depth to improve the adhesion strength and the bearing capacity.

<Other Related Prior Art Documents>

1. Korean Patent No. 10-0952458

2. Korean Patent No. 10-1126483

3. Korean Patent No. 10-1136523

4. Korean Patent No. 10-1038723

5. Korean Patent No. 10-0375495

The present invention has been developed in order to overcome the limitations of the conventional technique as described above, and it is an object of the present invention to provide a method for repairing and reinforcing a damaged portion of a concrete structure (for example, an underwater structure or a land structure) The anchor bar (or the anchor rod) is inserted so as to match the depth or the width of the damaged portion to be restored immediately before the operation, thereby minimizing the inconvenience in the section repairing operation, It is possible to finish the repair work without expanding the outer diameter of the structure after the repair work by installing the panel to ensure the internal restraint of the breakage portion. By using materials with excellent properties such as compressive strength while maintaining their properties, Effect is to provide a damaged part repair reinforcement of concrete structures can be maintained for a long time.

In order to achieve the above object,

(a) chipping a damaged part of a concrete structure, arranging a section thereof, and measuring the depth and size of the damaged part;

(b) assembling panel guides on both sides of the damaged portion of the concrete structure;

(c) an anchor body formed in an L-shaped cross-section in the sectioned section and having an anchor body having a plurality of anchor bar insertion holes and an anchor base for fastening the anchor body to a cross section, Inserting and fixing an anchor bar in the anchor bar insertion hole according to the depth and size of the anchor bar;

(d) inserting a panel made to fit the width of the assembled panel guide into the panel guide and binding upper and lower ends of the panel to the concrete structure;

(e) injecting filler from outside through an injection hole formed in the panel; And

(f) curing the filler material;

The present invention provides a method of reinforcing and repairing a damaged portion of a concrete structure.

In one embodiment of the present invention, in assembling the panel guide to the damaged portion of the concrete structure in the step (b), the partition wall is disposed at the middle portion of the damaged portion, and the two- The two-way panel guide is coupled to the upper structure of the damaged portion to fix the partition, and the panel is inserted between the two-way panel guide and the left and right panel guides.

Also, in one embodiment of the present invention, in step (c), the L-shaped anchor body may be twisted so that when the plurality of anchor bars are inserted into the anchor bar insertion hole, So as to be able to be used.

Also, in an embodiment of the present invention, when the concrete structure is an underwater structure, the filler of (e) may be a water-exclusive mortar, a water-soluble concrete, or a mixture of fine aggregate and water-exclusive mortar.

At this time, the water-exclusive mortar is composed of 100 parts by weight of artificial marble waste powder, 20 to 50 parts by weight of a slag-containing mixture, and 20 to 40 parts by weight of a cement paste containing 20 to 40 parts by weight of phosphorus- weight%; 30 to 60 wt% portland cement; 5 to 20% by weight of a cellulose fiber; Exclusive mortar obtained by mixing 10 to 30% by weight of a filler, 30 to 69% by weight of an aggregate and 0.1 to 3% by weight of an underwater separator with 20 to 50% by weight of a binder composed of 5 to 10% by weight of EVA resin have.

The features and advantages of the method of reinforcing and repairing a damaged part of a concrete structure using the assembled anchor body and panel according to the present invention will be described as follows.

1. First, in an underwater or onshore concrete structure, anchor bars are attached to an anchor body by welding in order to repair and reinforce damaged portions. In the conventional anchor body, And the anchor bars cause inconveniences in the work during the work such as the plastering work or the diver. In many cases, the reinforcement work is carried out using only the anchor body without the anchor bar in the actual field. In this case, even if the mortar filler material is injected, it is difficult to secure the bonding strength, so that there is a problem that the breakage occurs again in the repair part. In order to minimize the inconvenience of such workers, the present invention eliminates the need for plastering in the side walls, and in the case of an underwater structure, the anchor base is fastened to the section of the anchor base only by a simple method when the anchor body is fixed, Simply putting anchor bars (anchor rods) into place will allow the work to be terminated, maximizing the convenience of the work.

2. It is also possible to improve the efficiency of work by making mortar filler injected from outside and curing it without needing additional plastering work, so that the efficiency of work can be improved, and the internal restraint of the filler material It is possible to ensure that the outer diameter of the structure does not expand after the repair work.

3. In repairing and reinforcing the damaged part of the underwater structure, it is possible to use the exclusive water-exclusive mortar material having excellent properties such as compressive strength while maintaining the property of quick hardening, material non-separating property and high fluidity, .

Fig. 1 shows that a damaged portion occurred on a side wall of a concrete structure.
FIG. 2A and FIG. 2B are views illustrating the repair and reinforcement of a damaged portion of a concrete structure using a dedicated assembled anchor body and a panel according to an embodiment of the present invention.
FIGS. 3A to 3E are sectional views illustrating a process of repairing and reinforcing a damaged portion of a concrete structure using a dedicated anchor assembly and a panel according to an embodiment of the present invention.
Fig. 4 shows an example of the assembled anchor body used in the present invention, and Fig. 5 shows another example of the anchor body used in the present invention.
6A is a view showing an example of an assembled anchor body to which a twisted anchor body used in the present invention is applied.
6B is a view showing an anchor bar inserted into an assembled anchor body to which the twisted anchor body used in the present invention is applied.
FIG. 7 is a front view showing that an anchor bar is inserted into a twisted anchor body used in the present invention, and that the reinforced concrete anchor body is subjected to section maintenance reinforcement.
8 is a view showing an example of a repair and reinforcement method according to the present invention with respect to a damaged portion of a land-based concrete structure.
9 is a view showing an example of a repair and reinforcement method according to the present invention with respect to a damaged portion of an underwater concrete structure.

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

FIGS. 2A and 2B are views showing a repair and reinforcement of a damaged portion of a concrete structure using a dedicated anchor assembly and a panel according to an embodiment of the present invention. FIGS. 3A to 3E are views Sectional view showing a process of repairing and reinforcing a damaged portion of a concrete structure using a dedicated assembled anchor body and a panel according to an example.

Referring to FIGS. 2A and 2B and FIGS. 3A to 3E, the method of reinforcing and repairing a damaged portion of a concrete structure according to the present invention includes:

(a) chipping the damaged portion 20 of the concrete structure 10, arranging a section thereof, and measuring the depth and size of the damaged portion (FIG.

(b) assembling the panel guide 30 on both sides of the damaged portion of the concrete structure 10 (Fig. 3B);

(c) an anchor body 100 having an anchor body formed in an L-shaped cross section and having a plurality of anchor bar insertion holes and an anchor base for fastening the anchor body to a cross section, Inserting and fixing an anchor bar 101 in the anchor bar insertion hole 103 in accordance with the depth and size of the damaged portion (Fig. 3C);

(d) inserting a panel (40) manufactured to fit the width of the assembled panel guide (30) into the panel guide (30) and binding the upper and lower ends of the panel (40) to the concrete structure 3d);

(e) injecting filler from the outside through the injection hole 42 formed in the panel 40 (FIG. 3E); And

(f) curing the filler material;

.

First, in step (a), the damaged portion (broken portion 20) of the concrete structure 10 is chipped, the cross section is organized, and the depth and size of the broken portion are measured. Specifically, the surface of the damaged concrete structure is chipped and the surface and cross-section are trimmed until the undamaged portion comes out. That is, chipping is performed on the section of the damaged concrete or the high pressure washing water is sprayed to remove the deteriorated portion and then trim the damaged portion.

In addition, the size of the damaged portion of the concrete structure 10, that is, the width, the width, and the depth are measured. The range to be repaired and reinforced shall be determined according to the measured results.

Subsequently, in the step (b), the panel guide 30 is assembled to both sides of the damaged portion of the concrete structure. The panel guide 30 uses a panel guide 30 provided with a recessed portion 30-1 having an insertion groove in the center direction and the panel guide is fixed to the concrete by using an anchor bolt 31, So as to be fixed to the structure (10).

Although not shown in the figure, when the panel guide is assembled to the damaged portion of the concrete structure in the step (b), if the width or width of the damaged portion is wide, a partition wall is disposed in the middle portion of the damaged portion, Directional panel guide is attached to the end portion of the damper so that the two-way panel guide is fastened and fixed to the upper structure of the damaged portion to support the partition wall, and the panel can be inserted between the left and right panel guides have.

Next, in the step (c), the assembled anchor body is bound to the broken part. The assembled anchor body 100 includes an L-shaped anchor body having a plurality of insertion holes for inserting an anchor bar (or an anchor rod), and an anchor body coupled with the anchor body to form a concrete structure And an anchor bar (or an anchor rod) which is fixedly inserted into the insertion hole in a single or a plurality of insertion holes.

More specifically, the anchor base can use various anchors such as a set anchor, a wedge anchor, and a drop-in anchor, and serves to fix an anchor body of an L shape. A plurality of anchor bar insertion holes may be formed in the anchor body, and the anchor bars may be fitted in a tight fitting manner. This allows the anchor bar to increase the physical adhesion with the section repair mortar. The anchor bar may be a reinforcing bar, a steel bar, a fiber anchor rod, or the like.

Various forms of the assembled anchor body 100 used in the present invention will be described later.

Next, in step (d), a panel 40 previously prepared according to the width of the assembled panel guide is inserted into the panel guide 30, and the upper and lower ends of the panel are fixed with an anchor bolt 41, To the concrete structure (10). The panel 40 is preferably provided with an injection hole 42 for injecting filler into the panel.

Subsequently, in step (e), the filling material 50 is injected from the outside (for example, onshore) through the injection hole 42 formed in the panel 40 by using a high-pressure pump or the like. As the filler material is injected, the panel 40 is blocked at the front surface of the concrete structure, so that the filler is filled in the shape of the panel 40 and the filler material is filled, so that the concrete structure and the panel are completely filled.

If the filling material 50 is cured in the step (f), the repair and reinforcement work of the damaged part is completed.

In the present invention, various fillers may be used. However, when used in an underwater concrete structure, it is preferable to use a material which can be easily cured in water and maintain its physical properties. , An underwater exclusive concrete or a mixture of fine aggregate and an underwater exclusive mortar.

Particularly, in the case of the water-exclusive mortar, the water-exclusive mortar composition having excellent durability and strength proposed by the present applicant through the already registered patent No. 10-1436780 can be used, and the composition of the material is as follows.

First, 100 weight parts of artificial marble waste powder, 20 to 50 weight parts of a slag-containing mixture, and 20 to 40 weight parts of phosphorus-containing plaster or flue gas desulfurization water-soluble plaster were prepared. 20 to 50% by weight of a binder, 30 to 60% by weight of a portland cement, 5 to 20% by weight of a cellulose fiber and 5 to 10% by weight of an EVA resin to obtain a binder component, 10 to 30% by weight, 30 to 69% by weight of aggregate and 0.1 to 3% by weight of an underwater separator are mixed to obtain an exclusive mortar.

A specific description of the above-mentioned water-exclusive mortar can be found in the aforementioned Japanese Patent No. 10-1436780.

Fig. 4 shows an example of the assembled anchor body used in the present invention, and Fig. 5 shows another example of the anchor body used in the present invention.

4 and 5, the assembled anchor body 100 used in the present invention includes an anchor body 102 having an L shape, an anchor base 102 for fastening the anchor body to an end face, And an anchor bar 101 inserted in the insertion hole 103 of the anchor body 102 in an interference fit manner to increase the physical adhesion force of the filler.

As shown in the drawing, the anchor body has a bottom portion and an extension portion extending in an elbow shape, and the bottom portion is fixed to the anchor base by a head and a nut (not shown) provided on the anchor base, A plurality of insertion holes 103 are provided. The length of the extended portion and the number of the insertion holes can be determined in the field according to the depth of the damaged portion to be recovered. In other words, when the depth of the damaged portion is shallow, only a single number of insertion holes formed in the extended portion may be used. When the depth of the damaged portion is deep, several insertion holes formed in the extended portion are provided, The bar may be inserted at the site.

In addition, anchor bars having a length corresponding to the size (area) of the damaged portion can be selected and used.

FIG. 6A is a view showing an example of an assembled anchor body to which the twisted anchor body used in the present invention is applied, FIG. 6B is a view showing an anchor bar inserted into an assembled anchor body to which the twisted anchor body used in the present invention is applied Fig.

6A and 6B, when the anchor body 102 is formed of a twistable member, the direction of the anchor bar 101 inserted and fixed in the insertion hole can be arbitrarily adjusted. Therefore, Suitable for large widths. Further, even if the depth of the section to be restored is the same, a greater number of anchor bars can be fastened, thereby further enhancing the adhesive strength increasing effect.

FIG. 7 is a front view showing that an anchor bar is inserted into a twisted anchor body used in the present invention, and that the reinforced concrete anchor body is subjected to section maintenance reinforcement.

7, in the present invention, when the anchor body 102 is formed of a twisted anchor body, the anchor bar 100 can be formed in a plurality of directions (for example, radial) by only one anchor body 100, It is possible to reduce the use amount of the battery 100 and dramatically shorten the working time.

FIG. 8 is a view showing an example of a repair and reinforcement method according to the present invention with respect to a damaged portion of an onshore concrete structure, and FIG. 9 is an example of a repair and reinforcement method according to the present invention with respect to a damaged portion of an underwater concrete structure. Fig.

As shown in FIGS. 8 and 9, the repair and reinforcement method according to the present invention can be widely used not only for a damaged portion of a concrete structure on land, but also for repairing and repairing a damaged portion of a concrete structure in water. The only difference is that in the case of concrete structures in water, the filler material uses a special underwater filler.

The method of repairing and reinforcing concrete structures using the assembled anchor body and the panel according to the present invention has been described in detail.

The use of the special method according to the present invention minimizes the inconvenience of the field worker since the plastering operation is not necessary and in case of an underwater structure, the diver can fix the anchor base only to the single- The work can be completed simply by inserting an anchor bar (anchor rod). Therefore, the convenience of the work can be maximized. In addition, it is possible to increase the efficiency of the work by making the repair and reinforcement work to be finished by injecting mortar filler from the outside and curing it without requiring any additional plastering work, and it is possible to secure the internal restraint of the filler material using the panel It is possible to prevent the outer diameter of the structure from expanding after the repair work. In order to repair and reinforce the damaged part of the underwater structure, it is necessary to use a proprietary underwater exclusive mortar material having excellent properties such as compressive strength while maintaining the property of quick hardening, material non-separating property and high flowability so that the maintenance reinforcing effect is maintained for a long time There is an effect that can be done.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. And should be construed as falling within the scope of protection.

10: Underwater concrete structure 20:
30: Panel guide 30-1: Groove
31: anchor bolt 40: panel
41: anchor bolt 42: injection hole
50: Filler
100: anchor body 101: anchor bar
102: anchor body 103: insertion hole
104: anchor base

Claims (5)

(a) chipping a damaged part of a concrete structure, arranging a section thereof, and measuring the depth and size of the damaged part;
(b) an anchor body formed in an L-shaped cross-section in the sectioned section and having an anchor body having a plurality of anchor bar insertion holes and an anchor base for coupling the anchor body to an end face, Inserting and fixing an anchor bar in the anchor bar insertion hole according to the depth and size of the anchor bar;
(c) assembling panel guides on both sides of the damaged portion of the concrete structure;
(d) inserting a panel made to fit the width of the assembled panel guide into the panel guide and binding upper and lower ends of the panel to the concrete structure;
(e) injecting filler from outside through an injection hole formed in the panel; And
(f) curing the filler material;
And,
In the step (b), the L-shaped anchor body may be a twistable member. When the anchor bar is inserted into the anchor bar insertion hole, the direction of the anchor bar may be arbitrarily adjusted. So that the anchor bar can be formed in various directions by only one anchor body,
In the step (c), when the panel guide is assembled to the damaged portion of the concrete structure, a partition wall is disposed at the middle portion of the damaged portion and a bi-directional panel guide is installed at the outer end of the partition, And the panels are inserted between the bidirectional panel guides and the left and right panel guides so as to support the partition walls.
delete delete The method according to claim 1, wherein when the concrete structure is an underwater structure, the filler of (e) is a mixture of water-exclusive mortar, water-soluble concrete or fine aggregate and water-exclusive mortar. Method.
The underwater mortar according to claim 4, wherein the water-exclusive mortar comprises 100 parts by weight of artificial marble waste powder, 20 to 50 parts by weight of a slag-containing mixture, and 20 to 40 parts by weight of phosphorus- To 50% by weight; 30 to 60 wt% portland cement; 5 to 20% by weight of a cellulose fiber; Exclusive mortar obtained by mixing 10 to 30% by weight of a filler, 30 to 69% by weight of an aggregate and 0.1 to 3% by weight of an underwater separator with 20 to 50% by weight of a binder composed of 5 to 10% by weight of an EVA resin A method of reinforcing a damaged part of a concrete structure.

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