KR101983043B1 - Underwater concrete structure crack repair method, and hybrid packer for the same - Google Patents

Abstract

The present invention relates to a crack repair method for an underwater concrete structure, capable of increasing durability and long-term strength, and a hybrid packer for the same. According to the present invention, the crack repair method for an underwater concrete structure comprises: a first step of measuring the shape of a crack (10) generated in the underwater concrete structure, and the width and length of a cracked portion, and recording measured data; a second step of analyzing whether the volume of the crack exceeds a preset threshold blade or not; and a third step of differently setting the size of a cut part (51) of a hybrid packer in accordance with an analysis result in the second step.

Description

Underwater concrete structure crack repair method, hybrid packer, and hybrid packer for the same,

The present invention relates to a crack repairing method for an underwater concrete structure and a hybrid packer for the same. More particularly, the present invention relates to a hybrid packer for repairing a crack formed on a wall surface of an underwater concrete structure, A concrete structure for repairing cracks in an underwater concrete structure to improve the durability and long-term strength after the repair material is hardened by discharging the fluid inside at the same time as sealing by hydraulic pressure of the repair material provided in the hybrid packer And a hybrid packer for this purpose.

Underwater concrete structures are constantly subjected to external forces due to contact friction caused by the flow of water, collision caused by waves, water pressure, etc., because all or part of the structures are immersed in water. Therefore, the underwater concrete structure starts to deteriorate at the part that receives the strongest external force or the weakest part by the water, and cracks are generated, and the crack is further developed and chipping around this part.

If such cracks or chipping phenomena are detected early and proper measures are not taken, the strength of the underwater concrete structure may drop sharply and proceed to the worst of collapse.

However, since the underwater concrete structure is installed in the water, it is very difficult to judge the degree of deterioration and perform proper maintenance in reality. It is expensive, time consuming, requires high technology, There are many difficulties because it is larger than the repair of the structure.

In relation to this, Korean Patent Application No. 10-2001-0019013 " Method for repairing the underwater construction and structure thereof " is used for repairing columns of sea facilities and columns of pier facilities, etc. Rustproofing, waterproofing, and structures that can be used to apply the method.

In addition, Korean Patent Application No. 10-2000-0056650 " Temporary levee protector for repairing underwater structure and installation method for the levee " It can be reused easily and easily as well as being easy to construct by filling water or air using a relatively lightweight tube for repairing the underwater structure repair water and air for filling water or air in the tube body, This is a technique for making a remarkable reduction.

Korean Patent Application No. 10-2013-0109781 entitled " Repairing method of sea and underwater structures using urethane for reinforcement ", which uses urethane for repairing marine structures and underwater structures, This invention relates to a marine structure capable of repairing, reinforcing or expanding a marine structure that has been corroded by seawater penetration by using a strong urethane, and a method of repairing marine and underwater structures using the urethane.

Korean Patent Application No. 10-2006-0027196 entitled " Silane Modified Epoxy Composition for Maintenance and Reinforcement of Underwater Structures and Reinforcing Methods Using As Silane Modified Epoxy Composition for Underwater Structure " The present invention relates to a repair and reinforcement method for restoring the strength of a structure that has been deteriorated by being injected into an epoxy resin or by attaching the epoxy resin modified with a silane compound to the surface of a structural object to be reinforced by using glass fiber, carbon fiber or aramid fiber.

However, all of the above technologies can not form the drainage channel in the perforation region for the inflow of the hybrid packer for repairing cracks and repair for repairing the crack formed on the wall surface of the underwater concrete structure, Durability, long-term strength, etc., which are caused by the use of the resin.

Korean Patent Application No. 10-2001-0019013 " Method for repairing the underwater construction and structure thereof " Korean Patent Application No. 10-2000-0056650 " Temporary levee protector for repairing underwater structure and installation method for the levee " Korean Patent Application No. 10-2013-0109781 " Repairing method of sea and underwater structures using urethane for reinforcement using urethane for repairing marine structure and underwater structure " Korean Patent Application No. 10-2006-0027196 entitled " Silane Modified Epoxy Composition for Maintenance and Reinforcement of Underwater Structures and Reinforcing Methods Using As Silane Modified Epoxy Composition for Underwater Structure "

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a hybrid packer in which, in order to repair cracks formed on a wall surface of an underwater concrete structure, A method of repairing cracks in an underwater concrete structure to improve the durability and long-term strength after the repair material is cured by discharging the fluid to the outside at the same time as sealing with the hydraulic pressure of the provided repair material, and to provide a hybrid packer for the same will be.

In addition, according to the present invention, not only the method and the type of the packer can be individually set according to the volume of the crack formed on the wall surface of the concrete structure, but also the size of the cut part is set individually according to the type of each packer, And to provide a hybrid packer for the same. The present invention also provides a method for repairing cracks in an underwater concrete structure, and a hybrid packer for the same.

In addition, the present invention is intended to solve the problem of not only improving the fastening property to the cracks of the repairing material by the double structure of the inner sealing material and the outer sealing material, but also to prevent cracks in the underwater concrete structure Repair method, and a hybrid packer for the same.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, in order to repair a crack (10) of an underwater concrete structure, an underwater concrete structure crack repairing method according to an embodiment of the present invention uses an imaging camera including an endoscope camera, A first step of measuring the shape of the crack (10), the width and length of the cracked part, and recording the measured data; A second step of analyzing whether the volume of cracks is below a preset threshold value or exceeding a preset threshold value according to the data recorded in the first step; And a third step of setting the size of the cut portion 51 of the hybrid packer differently according to a predetermined threshold according to the analysis of the second step. And a control unit.

In this case, the present invention is characterized in that, when the step is not reached by a predetermined threshold value in the second step after the third step, based on the data acquired in the first step, A fourth step of forming the perforations 20; And further comprising:

The perforation 20 in the fourth step is formed in a circular or polygonal shape and is formed to be 1.75 to 2.15 times the diameter of the injection pipe of the hybrid packer 50.

Further, in the present invention, after the fourth step, a fifth step of performing sealing using the polypropylene-based sealing material 30 having a lattice structure (mesh structure) for porous formation in the perforations 20; And further comprising:

In the present invention, after the fifth step, the wall sealing material 40 is left only on the portion filled with the polypropylene-based sealing material 30 forming the inner peripheral surface of the perforation 20, A sixth step of performing coating with a preset height on the substrate; And further comprising:

In the present invention, in the fifth step, the polypropylene-based sealing material 30 along the inner peripheries of the perforations 20 has a diameter of 0.45 to 0.54 times the diameter of the injection pipe of the hybrid packer 50, And is formed by stacking a plurality of layers.

In addition, the present invention is characterized in that the injection port 40a for insertion into the hybrid packer 50 is formed by forming the wall surface sealing material 40 of the sixth step.

Further, in the present invention, after the sixth step, the air flow path-based hybrid packer 50 is formed in close contact with the perforations 20 through the injection port 40a; And further comprising:

In the seventh step, when the hybrid packer 50 is inserted into the injection port 40a in which the polypropylene based sealing material 30 is formed, in the hybrid pluger 50 of the hybrid packer 50, And the front end portion 52 formed to have the same length as the length of the perforation 20 is filled in the region.

In the hybrid packer 50 of the seventh step, the cross section of the injection tube formed by the front end portion 52 and the rear end portion 53 is circular or polygonal, and the front end portion 52 And the rear end portion 53 are formed to have a diameter of 0.87 to 0.96 times as large as the diameter of the injection tube and the cutting groove is formed in the intermediate region in the longitudinal direction of the cut portion 51, And is formed to have a size of 0.56 to 0.67 times the diameter.

In order to repair the cracks formed on the wall of the underwater concrete structure, the hybrid packer for the underwater concrete structure crack repair and maintenance method according to the embodiment of the present invention has a self-piercing region for inflow of the hybrid packer By forming the drainage flow path, there is an effect of improving the durability and the long term strength after the maintenance material is cured by discharging the internal fluid to the outside at the same time as sealing by the oil pressure of the repairing material provided to the hybrid packer.

In addition, according to another embodiment of the present invention, there is provided a method for repairing cracks in an underwater concrete structure, and a hybrid packer for the same, in which not only the construction method and the type of the packer can be individually set according to the volume of cracks formed on the wall surface of the concrete structure, According to the kind of the packer, the size of the cut portion is also set individually, and the grout composition injected into the cracked portion due to the interaction with the wall sealant can be prevented from leaking backward.

In addition, according to another embodiment of the present invention, there is provided a method of repairing cracks in an underwater concrete structure, and a hybrid packer for the same, in which a double structure of an inner sealing material and an outer sealing material improves the fastening property However, there is an effect that it can be utilized in a fixed amount according to cracks without waste of the repairing material.

1 is a view showing a repair method of underwater concrete structure cracks according to an embodiment of the present invention.
FIGS. 2 to 5 are views for explaining a process of a crack repairing method in an underwater concrete structure according to a first embodiment of the present invention.
FIGS. 6 to 8 are views for explaining a process of a crack repairing method in an underwater concrete structure according to a second embodiment of the present invention.
9 is a view for explaining the structure of the injection hole module 54 of the hybrid packer 50 used in the underwater concrete structure crack repairing method according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view showing a repair method of underwater concrete structure cracks according to an embodiment of the present invention. FIGS. 2 to 5 are views for explaining a process of a crack repairing method in an underwater concrete structure according to a first embodiment of the present invention. FIGS. 6 to 8 are views for explaining a process of a crack repairing method in an underwater concrete structure according to a second embodiment of the present invention. 9 is a view for explaining the structure of the injection hole module 54 of the hybrid packer 50 used in the underwater concrete structure crack repairing method according to the embodiment of the present invention.

Referring to FIG. 1, the underwater concrete structure crack repairing method includes a crack irradiation process S100, a piercing process S200, a polypropylene-based sealing material S300, a wall sealing process S400, (S600), a wall seal material removing process (S700), a hybrid packer rear end (53) cutting process (S700), and a finishing portion forming process (S900 ).

Hereinafter, the method for repairing cracks in underwater concrete structures according to the first embodiment shown in FIGS. 2 to 5 will be described first, and the method for repairing cracks in underwater concrete structures according to the second embodiment shown in FIGS. The difference from the first embodiment will be mainly described.

[First Embodiment]

In the crack irradiation step S100, in order to repair the crack 10 of the underwater concrete structure, an image photographing device such as an endoscope camera is used and the crack 10 generated in the underwater concrete structure as shown in FIG. It is preferable to measure the shape and the width and the length of the crack region and to record the measurement data for such crack 10.

The data obtained in the crack irradiation step (S100) is used to determine the type of the hybrid packer (50) required for crack repair, the type and application amount of the elastic polypropylene based sealing material (30) and the wall sealing material (40) So that the crack repairing method can be selected according to the first embodiment and the second embodiment. That is, when the volume of the crack due to the width and the length of the underwater concrete structure crack 10 is less than a preset threshold value, according to the first embodiment, and when the predetermined threshold value is exceeded, the second embodiment can be used.

First, in the drilling process (S200), a drill 20 for forming a packer is formed as shown in FIG. 2B having a preset width and length using a drill based on the data acquired in the step S100. Here, the perforations 20 may be formed in a circular or polygonal shape, and are preferably formed to be 1.75 to 2.15 times the diameter of the injection tube of the hybrid packer 50 described later.

The sealing step S300 using the polypropylene-based sealing material 30 in the perforation 20 is a flame-retardant material as shown in Fig. 2C. The epoxy resin, carbon fiber and flame retardant are added to the reclaimed polypropylene, A recycled polypropylene resin can be utilized.

More specifically, carbon fibers are added to and mixed with recycled polypropylene, which is a waste synthetic resin, to obtain a polypropylene resin that is a carbon fiber reinforced plastic (CFRP). The carbon fiber-reinforced polypropylene resin is stronger than iron, It has the advantage of being lightweight and not rusting and excellent in workability.

Here, 4 to 6 parts by weight of an epoxy resin having an adhesive property and 5 to 7 parts by weight of a flame retardant are added to and mixed with 100 parts by weight of a mixture containing 75 to 78 parts by weight of polypropylene and 22 to 25 parts by weight of carbon fibers, Is added to and mixed with carbon fiber having excellent fracture strength, and the flame retardant is added to the polypropylene, which is a flammable material, so that flame retardancy is imparted to the flame retardant. In addition, an underwater epoxy resin And then using the polypropylene resin after the regenerated polypropylene resin is used, it is possible to exhibit high functionality and flame retardancy. In the present invention, the flame retardant is one selected from the group consisting of antimony molybdate, aluminum hydroxide, molybdenum oxide, and magnesium hydroxide or a mixture of two or more thereof. Particularly, aluminum hydroxide (Al (OH) ₃ ) is heated in the filling of the grout composition by the carbon fiber-reinforced polypropylene resin which is formed in foam form, and when the temperature exceeds 100 ° C., the micropores are changed into numerous active alumina, It adsorbs harmful substances such as dioxin and HCl (HCl) which are generated during combustion and exerts an endothermic reaction during thermal decomposition. It also has a cooling effect and is excellent in water resistance and acid resistance because it is nonflammable. In addition, the flame retardant effect can be expected to be improved by using the above flame retardants in combination.

Meanwhile, in the present invention, in order to form a film-type polypropylene sheet to be a material of the polypropylene-based sealing material 30, extrusion is performed using an extrusion apparatus in water to form an extruded melt, wherein the extruded melt is melted at a temperature of 270 to 280 ° C . Thereafter, when the extruded melt in the molten state forms a film-type polypropylene sheet in the perforation 20, the film type polypropylene sheet is cooled by utilizing a cooling device, and by repeating this method, The polypropylene-based sealing material 30 can be laminated by a predetermined thickness. The cooling device used in the present invention can control the temperature of a film-type polypropylene sheet at a predetermined temperature range by utilizing a Peltier element, a temperature sensor, and an Arduino substrate. Here, the temperature setting range is preferably set in the range of -4 ° C to 0.15 ° C in consideration of the temperature difference immediately after the formation of the film-type polypropylene sheet for the cooling and extruded melt corresponding to the room temperature state. Thereafter, the cooling apparatus can provide a thermal stabilization process at room temperature.

On the other hand, during the thermal stabilization process for the polypropylene sheet, a uniform lattice structure (mesh structure) having a diamond shape, net shape, and rectangular shape is formed by further performing a mesh process together with softening of the polypropylene sheet . By forming such a mesh structure, the polypropylene-based sealing material 30 can be remarkably reduced in weight by providing flexibility and laminating polypropylene sheets having a plurality of mesh structures, and the weight of the polypropylene-based sealing material 30 can be drastically reduced, The Euro can be provided.

More specifically, the polypropylene-based sealing material 30 formed by the process after the step of forming the polypropylene-based sealing material 30 into the perforations 20 is formed by the hybrid packers 50 The porous structure of the polypropylene-based sealing material 30 in which air in the concrete structure crack 10 underwater forms the inner peripheral surface of the perforation 20 for inserting the packer according to the filling of the grout composition with the underwater concrete structure crack 10 Based sealing material 30 that forms the inner circumferential surface of the perforation 20 and allows the grout composition to be sequentially discharged from the inner side adjacent to the crack 10 to the outer side spaced apart from the crack 10 by utilizing the structure of the polypropylene- And the porous regions of the polypropylene-based sealing material 30 are sequentially filled, so that the outside of the front end portion 52 of the hybrid packer 50 Between the inner peripheral surface of the face and the perforation 20 it is possible to provide an effect of strongly fastened.

On the other hand, in order to produce the polypropylene-based sealing material 30, the above-mentioned polypropylene sheet is layered and laminated, and the whole process as in the production process of the foamed foam is a step of foaming the expanded synthetic resin particles, A drying step of removing the contained moisture and a forming step of supplying hot particles to the dried expanded particles so that the expanded particles are tangled with each other, and the coating step may be further performed before the molding step is performed.

It is preferable that the blowing agent is blended with 3 to 7 parts by weight of the foaming agent per 100 parts by weight of the laminated whole polypropylene sheet. If the content of the foaming agent used for producing the foamed polyethylene mixture is more than 7 parts by weight, the rigidity, heat resistance and surface hardness of the polypropylene-based sealing material 30 of the split-layer structure are remarkably lowered and the porous structure is affected If the amount is less than 3 parts by weight, the specific gravity, foamability, moldability, and impact properties are undesirably deteriorated. It is preferable that sodium bicarbonate (NaHCO ₃ ) is mainly used as a chemical foaming agent mainly used.

The polypropylene-based sealing material 30 can function as a porous drainage flow path to the inside of the perforations 20 through the lamination of the foaming type between the polypropylene sheets, and the polypropylene- , It is possible to provide an effect of lowering the specific gravity in water.

The sealing step S400 of the wall surface is a step in which the polypropylene-based sealing material 30 along the inner perimeter of the perforation 20 in step S300 as shown in FIG. 3A has a diameter of the injection pipe of the hybrid packer 50, The wall sealing material 40 formed of a composition similar to the polypropylene based sealing material 30 is formed by forming the inner circumferential surface of the perforation 20 produced according to the perforating process of step S200 S300) with the polypropylene-based sealing material 30 leaving only the portion filled with the polypropylene-based sealing material 30 of the crack 10 in the water. Here, the wall sealing material 40 is prepared by adding 35 to 46 parts by weight of a silicone resin having an adhesive property and 8 to 10 parts by weight of a flame retardant to 100 parts by weight of a mixture containing 22 to 25 parts by weight of carbon fibers in 75 to 78 parts by weight of polypropylene, It is preferable to form them by mixing.

By forming the wall sealant 40, an inlet 40a for insertion into the hybrid packer 50 can be constructed in step S500 described later.

At this time, the grout composition 60 injected in the step S600 to be described later is prevented from leaking back to the crack 10 by the wall sealant 40, and at the same time, the grout composition 60 injected smoothly into the deep part of the crack 10 . The wall sealant 40 used in this case may be used as a silicone-based resin instead of an epoxy resin corresponding to the composition of the polypropylene-based sealing material 30, so that the grout composition 60 can be easily injected It is preferable that the wall sealing material 40 is not left on the surface thereof during the separation process.

The air flow path-based hybrid packer is formed in the process of forming the hybrid packer in close contact with the perforations by inserting and rotating the hybrid packer 50 through the inlet 40a so that a part of the hybrid packer 50 inserted into the inlet 40a is expanded A packer installation can be performed to secure the airtightness.

4A, when the hybrid packer 50 is inserted into the injection port 40a in which the polypropylene based sealing material 30 is formed, the front end portion 52, which corresponds to the front end of the cut portion 51 of the hybrid packer 50, It is preferable that the length is formed to be equal to the length of the perforation 20 formed by drill so that the interference with the polypropylene-based sealing material 30 is not excessive.

The rear end portion 53 of the hybrid packer 50 corresponding to the rear end of the cut portion 51 is provided with a hybrid packer 50 so as to be leaked to the surface of the underwater concrete structure It is preferable to insert it into the injection port 40a.

The cross section of the injection tube formed by the front end portion 52 and the rear end portion 53 is formed in a circular or polygonal shape and the diameter of the cutout portion 51 formed between the front end portion 52 and the rear end portion 53 is smaller than the diameter The cutting groove is formed to have a size of 0.56 to 0.67 times the diameter of the cut portion 51 in the middle region in the longitudinal direction, The end portion 53 can be easily cut when it is cut.

The grout composition filling process (S600) is a process of filling the concrete structure 10 underwater and using the hybrid packer 50 so as to be absorbed up to the area filled with the polypropylene-based sealing material 30 in the perforation 20 for inserting the packing Lt; / RTI >

The hybrid packer 50 may be formed with only one main injection hole or may be formed as an injection hole module 54 formed of the main injection hole 54a and the auxiliary injection hole 54b as shown in FIG. The underground concrete structure crack 10 is filled with the grout composition by utilizing the main injection hole 54a and the auxiliary injection hole 54 formed in the direction orthogonal to the main injection hole 54a with the polypropylene based sealing material 30, The grout composition can be filled by utilizing the grout 54b. This structure can be similarly applied to the structure of FIG. 9B in the second embodiment.

Wherein the grout composition for injection comprises 12 to 15 parts by weight of an epoxy adhesive, 6 to 8 parts by weight of a curing agent, 22 to 35 parts by weight of a biotite-based reinforcement, 4 to 5 parts by weight of a fluidizing agent, To 3 parts by weight.

In the present invention, the Portland cement can be used from one to five kinds of cement according to the application, and other ultra fast cement or alumina cement may be used. In particular, when the object to be repaired is an underwater concrete structure corresponding to an offshore structure, sulfated cement and slag cement excellent in erosion resistance against sulfate can be used.

The epoxy adhesive is formed for adhesion to the polypropylene based sealant 30. The amphibole-based stiffener not only improves the mixing performance of the grouting composition for injection, but also improves the durability and long-term strength of the grouting composition for injection (22 to 25 parts by weight of loess, 12 to 14 parts by weight of mud) and 9 to 8 parts by weight of fine silica powder with respect to 100 parts by weight of the gypsum powder, and optionally 6 to 7 weight Section. When the amount of the amphibole-based stiffener is less than 22 parts by weight, the durability of the grout composition for injection is not greatly improved. When the amount exceeds 35 parts by weight, the initial compressive strength is decreased or the flowability is decreased. The workability of the grout composition may be adversely affected.

The fluidizing agent is added to improve the injectability of the grouting composition for injection, and melamine-based, naphthalene-based, and carboxyl-based fluidizing agents are used. If the amount of the fluidizing agent is less than 4 parts by weight, the effect of improving the fluidity is insufficient. Therefore, a large amount of the mixed water is used and causes a decrease in compressive strength. When the amount of the fluidizing agent is more than 5 parts by weight, And the like.

Reactive control agents are used to control the rate of reaction of Portland cement to ensure adequate time for pouring operations and include one of the retarders such as citric acid, sodium gluconate, tartaric acid, silicic acid, methylcellulose, ethylcellulose, Branching components or at least two or more of them may be used in combination. If the amount is less than 2 parts by weight, the separation and coagulation retardation of the material is not greatly effected. If the amount exceeds 3 parts by weight, the coagulation time of the injection grout composition becomes very slow. .

Here, the grout composition for injection injected using the hybrid packer 50 is injected at a discharge pressure of 56 to 65 kgf / cm ² , whereby microcracks in the inside of the underwater concrete structure crack 10 and the micro cracks in the polypropylene- 30 can be filled up to the filled area.

The wall sealant removing step S700 may be performed by utilizing the hybrid packer 50 so that the cracks 10 in the concrete structure and the perforations 20 for inserting the polypropylene are filled up to the area filled with the polypropylene based sealing material 30 as shown in FIG. After the grout composition for injection is injected, the grout composition for injection is hardened, and then the edge of the wall sealing material 40 covering the crack 10 of the concrete structure underwater is pulled and removed from the wall of the concrete structure.

The hybrid packer rear end 53 cutting process (S800) uses a grinder as shown in FIG. 5A or an operator manually hands the cut portion 51 of the hybrid packer 50 to discard the rear end portion 53. FIG.

The finishing part forming step S900 is a step for preventing a part of the cutting portion 51 of the hybrid packer 50 cut out as shown in FIG. 5B from being exposed to the outside, and for preventing the inside of the underwater concrete structure wall A finishing member 70 is formed to prevent wet and underwater cracking of the grout composition cured onto the polypropylene-based sealing material 30, thereby completing maintenance. Here, the closure member 70 can be finished by applying an aqueous epoxy putty for water.

[Second Embodiment]

Referring to FIGS. 2 and 6 to 8, the crack repairing method of an underwater concrete structure according to the second embodiment includes a crack irradiation step S100 of FIG. 2A, a drilling step S200 of FIG. 2B, The sealing S300 with the polypropylene-based sealing material can be performed in the same manner as in the first embodiment.

6A, the polypropylene-based sealing material 30 along the inner peripheries of the perforations 20 in the step S300 of the hybrid packer 50 corresponding to a preset thickness The wall sealing material 40 formed of a composition similar to the polypropylene based sealing material 30 may be formed on the inner peripheral surface of the perforation 20 formed in accordance with the perforating process of step S200 Based sealing material 30 of the forming step S300 so that the crack 10 is applied to the wall surface of the concrete structure wall at a predetermined height while leaving only a part of the area filled with the polypropylene-based sealing material 30 of the forming step S300.

Herein, the wall sealing material 40 leaves only a part of the area filled with the polypropylene-based sealing material 30 of the step S300, it is possible to externally coat the polypropylene-based sealing material 30 as shown in FIG. 6A, Herein, the application of the half-strength coating is one embodiment, in which the volume of the crack due to the width and length of the underwater concrete structure crack 10 corresponding to the data obtained in the crack irradiation step (S100) exceeds a predetermined threshold value, This may be the case where the composition filling step (S600) is required.

The wall sealant 40 may be made of the same composition as the first embodiment and may be formed by forming the wall sealant 40 so that the injection port 40a for insertion into the hybrid packer 50 in step S500 Lt; / RTI >

At this time, the grout composition 60 injected in the step S600, which will be described later, is prevented from leaking back to the crack 10 by the cutout 51 of the wall sealant 40 and the hybrid packer 50, So that it can be smoothly injected into the deep portion of the crack 10.

In addition, the air flow path-based hybrid packer 50 is formed by closely adhering the hybrid packer 50 to the perforation by inserting and rotating the hybrid packer 50 through the injection port 40a, thereby forming a part of the hybrid packer 50 inserted into the inlet 40a It is possible to perform the installation of a packer which is extended and fixed so as to maintain the airtightness.

7A, when the hybrid packer 50 is inserted into the injection port 40a formed with the polypropylene based sealing material 30, the front end portion 52, which corresponds to the front end of the cut portion 51 of the hybrid packer 50, It is preferable that the length is formed to be equal to the length of the perforation 20 formed by drill so that the interference with the polypropylene-based sealing material 30 is not excessive.

The rear end portion 53 of the hybrid packer 50 corresponding to the rear end of the cut portion 51 is provided with a hybrid packer 50 so as to be leaked to the surface of the underwater concrete structure It is preferable to insert it into the injection port 40a.

The cross section of the injection tube formed by the front end portion 52 and the rear end portion 53 is formed in a circular or polygonal shape and the diameter of the cutout portion 51 formed between the front end portion 52 and the rear end portion 53 is smaller than the diameter The cutting groove is formed to have a size of 0.32 to 0.37 times the diameter of the cut portion 51 in the middle region in the longitudinal direction, The end portion 53 can be easily cut when it is cut.

The grout composition filling process (S600) is a process of filling the concrete structure 10 underwater and using the hybrid packer 50 so as to be absorbed up to the area filled with the polypropylene-based sealing material 30 in the perforation 20 for inserting the packing Lt; / RTI >

The wall sealant removing process S700 may be performed by utilizing the hybrid packer 50 so that the cracks 10 in the concrete structure and the perforations 20 for inserting the polypropylene are filled up to the area filled with the polypropylene based sealing material 30 as shown in FIG. After the grout composition for injection is injected, the grout composition for injection is hardened, and then the edge of the wall sealing material 40 covering the crack 10 of the concrete structure underwater is pulled and removed from the wall of the concrete structure.

The hybrid packer rear end 53 cutting process (S800) uses a grinder as shown in FIG. 8A or an operator manually transfers the cut portion 51 of the hybrid packer 50 to discard the rear end portion 53. FIG.

The finishing part formation step S900 is a step for preventing a part of the cut portion 51 of the hybrid packer 50 cut out as shown in FIG. 8B from being exposed to the outside, and for preventing the inside of the underwater concrete structure wall A finishing member 70 is formed to prevent wet and underwater cracking of the grout composition cured onto the polypropylene-based sealing material 30, thereby completing maintenance. Here, the closure member 70 can be finished by applying an aqueous epoxy putty for water.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Underwater concrete structure crack
20: Perforations for inserting packers
30: Polypropylene based sealing material
40: Wall sealant
50: Hybrid packer
60: grout composition
70:

Claims (10)

In order to repair the underwater concrete structure crack 10, it is necessary to measure the shape and the width and the length of the crack 10 generated in the underwater concrete structure by using the imaging equipment including the endoscope camera, ;
A second step of analyzing whether the volume of cracks is below a preset threshold value or exceeding a preset threshold value according to the data recorded in the first step;
A third step of setting the size of the cut portion 51 of the hybrid packer differently according to a predetermined threshold according to the analysis of the second step;
A fourth step of forming a hole 20 for inserting a packer having a predetermined width and length using a drill based on the data obtained in the first step when the predetermined threshold is not reached in the second step; And
A fifth step of performing sealing using a polypropylene-based sealing material 30 having a lattice structure (mesh structure) for porous formation in the perforations 20;
Wherein the cracks are formed on the surface of the concrete.
delete The method of claim 1, wherein the perforation (20)
And is formed in a circular or polygonal shape and is formed to have a diameter of 1.75 to 2.15 times the diameter of the injection pipe of the hybrid packer (50).
delete The method of claim 1, further comprising, after the fifth step,
A sixth step of applying the wall sealing material 40 at a preset height to the wall surface of the concrete structure in which the crack 10 is generated while leaving only the portion filled with the polypropylene based sealing material 30 forming the inner peripheral surface of the perforation 20, ; Further comprising the steps of:
6. The method of claim 5,
A polypropylene based sealing material 30 is formed along the inner peripheries of the perforations 20 in a thickness of 0.45 to 0.54 times the diameter of the injection pipe of the hybrid packer 50 corresponding to a predetermined thickness, Repair method.
The method of claim 5,
Wherein an inlet (40a) for insertion into the hybrid packer (50) is formed by forming the wall surface sealing material (40) in the sixth step.
The method of claim 7, further comprising, after the sixth step,
A seventh step of closely forming an air flow path-based hybrid packer (50) through the injection port (40a) to the perforations (20); Further comprising the steps of:
The method of claim 8,
When the hybrid packer 50 is inserted into the injection port 40a in which the polypropylene based sealing material 30 is formed, the length of the perforation 20 is equal to the length corresponding to the front end of the cut portion 51 of the hybrid packer 50 And the front end (52) is filled with the perforations (20).
10. The hybrid packer (50) of claim 9, wherein the hybrid packer (50)
The cross section of the injection tube formed by the front end portion 52 and the rear end portion 53 is formed in a circular or polygonal shape and the diameter of the cutout portion 51 formed between the front end portion 52 and the rear end portion 53 is smaller than the diameter Wherein the cut groove is formed in a size of 0.56 to 0.67 times the diameter of the cut portion 51 in an intermediate region in the longitudinal direction as well as in a size of 0.87 to 0.96 times the diameter of the tube, Repair method.

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