KR100686964B1 - Encasement method for repairing or reinforcing structures in the water and a repairing or reinforcing member used therein - Google Patents

Abstract

The present invention is an indentation method for repairing or reinforcing offshore structures such as steel pipe piles, concrete piles, wood piles, etc. installed in fresh water or seawater, and confirming the damaged portion of the offshore structure, and the damaged portion requiring repair or reinforcement. Displaying; Fabricating a FRP jacket from glass reinforced fiber plastic (FRP) and forming a plurality of epoxy grout inlets at appropriate intervals in the longitudinal direction of the FRP jacket; Installing the FRP jacket on a damaged portion requiring repair or reinforcement; Sequentially filling an injection valve from the lowest inlet located at the bottom of the plurality of epoxy grout inlets to the top inlet located at the top, thereby filling the grout filling space between the FRP jacket and the offshore structure step by step; And when the filling of the grout filling space is completed, curing for a sufficient time, separating the injection valve, and finally finishing the treatment. To provide.

According to the encasement method of the offshore structure according to the present invention, when the structures such as concrete piles, steel pipe piles, wood piles, etc. installed in the water is damaged by corrosion, peeling, peeling, damage, erosion, deterioration, etc. By using this excellent repair and reinforcement member, the damaged portion of the offshore structure can be repaired and reinforced firmly at a relatively low cost.

Steel Pipe Pile, Concrete Pile, Offshore Structure, Concrete, Repair, Grout, Corrosion Resistant

Description

ENCASEMENT METHOD FOR REPAIRING OR REINFORCING STRUCTURES IN THE WATER AND A REPAIRING OR REINFORCING MEMBER USED THEREIN}

1 is a side view of a repair / reinforcement member used in an enclosure method for repairing or reinforcing an offshore structure according to the present invention;

2 is a plan view of the maintenance / reinforcement member shown in FIG. 1;

Figure 3 is an enlarged cross-sectional view of the junction of the FRP jacket according to the present invention;

4 is an enlarged cross-sectional view illustrating an inlet for injecting epoxy grout in water and an injection valve connected to the inlet;

5 is a view showing a state in which the injection valve of Figure 4 is connected to the inlet;

6 is a process chart sequentially showing a specific process of constructing an enclosure method according to the present invention.

FIG. 7 is a view illustrating a state of filling in a jacket in correspondence with the sequential process diagram according to FIG. 6;

8 is an enlarged cross-sectional view for showing a processing state of the upper and lower sides of the FRP jacket;

9 is a view showing another application embodiment of the repair or reinforcement method according to the present invention.

<Explanation of symbols for the main parts of the drawings>                 

10: FRP jacket 12: gasket insert

14: gasket 16: grout filling space

18: outlet 20: underwater grout inlet

22: spacer 24: injection valve

30: junction 32: bolt or rivet

34: bonding surface 40: epoxy grout for water

42: underwater glue

The present invention relates to an encasement method for repairing or reinforcing offshore structures, and a repairing and reinforcing member used in the method. More specifically, concrete piles, steel pipe piles, and wooden piles installed in water are peeled, fallen, or dropped. If damaged by a defect such as a semi-transparent FRP jacket made of fiberglass Reinforced Plastic (hereinafter referred to as FRP) is installed on the damaged part of the structure, and the injection valve from the inlet located at the bottom of the FRP jacket By sequentially connecting the injection hole located at the top, the epoxy grout for injection is gradually filled from the bottom to the top of the FRP jacket, so that the enclosure and the method can effectively repair or reinforce the damaged part of the marine structure. It relates to a maintenance and reinforcement member used.                         

In general, the marine structure is always submerged in all or part of its body in the medium of water, and is constantly receiving external force externally by contact friction, water bumps, etc., due to the flow of water, and water pressure. Therefore, in the offshore structure, the portion that is most intensely affected by water or the most fragile portion of the structure is gradually deteriorated to gradually cause peeling or breaking. Failure to detect such delamination or failure early in the offshore structure and take appropriate action to reduce the strength of the offshore structure rapidly leads to the worst event of collapse. Nevertheless, maintenance and repair or reinforcement is never easy because of the situational uniqueness that marine structures are installed underwater. In other words, since it is necessary to overcome the obstacles of water and perform the desired repair or reinforcement work, technically costly difficulties are involved, and above all, the safety accidents require special consideration, which requires more careful work.

Conventional offshore pile repair or reinforcement methods have used PE film tapes to attach to or coat the outer surface of the structure. However, in such a conventional method, a PE film or the like used as a repair or reinforcement material (hereinafter, referred to as a reinforcement material) is easily peeled or peeled off due to a weakening of adhesion to the attaching surface and an external impact, etc. There was a problem that can not play my role.

Another conventional repair or reinforcement method is to install a jacket on the outer surface of the damaged structure, using a method (weight casting) to repair or reinforce the structure by injecting a cement-based material (reinforcement) from the top. However, the cement-based material conventionally injected into the jacket as a reinforcing material has a problem of lowering the adhesive strength with damaged parts of the structure due to the non-denseness between the components and different physical properties. Thus, the reinforcement will peel off or fall off resulting in cracking of the structure. In order to overcome this problem, in recent years, attempts have been made to use non-condensed concrete, epoxy mortar, and the like as reinforcing materials. However, in commercialization, physical properties such as reduction of strength with damaged parts and neutralization of mixtures such as mortar should be prevented. I am under constraint. In addition, in the conventional repair or reinforcement method, since a weight casting method of injecting a reinforcement such as a cement-based material from the top of the jacket is used, when the reinforcement is injected through fresh water or seawater inside the jacket, Air or water may additionally be introduced and such air or water could not be effectively evacuated or drained during any subsequent process. Therefore, water or air remaining inside the jacket weakens the adhesion between the damaged structure and the reinforcement, and bubbles and fine pores generated inside the filling may develop into cracks, thereby gradually decreasing the strength of the marine structure. Resulted.

The present invention was created to solve the above problems, when the marine structures such as concrete piles, steel pipe piles, wooden piles, etc. installed in fresh or sea water is damaged, FRP jacket made of glass reinforced fiber plastic (FRP) Of the offshore structure to effectively repair or reinforce the damaged area of the offshore structure by installing the on-damage part of the offshore structure, and then filling the epoxy grout in stages from the bottom inlet of the FRP jacket. Its object is to provide a construction method and a repair and reinforcement member used therefor.

The present invention for achieving the above object, in the encasement method for repairing or reinforcing offshore structures, such as concrete piles, steel pipe piles, wood piles, etc. installed in fresh water or seawater, to identify and repair damaged parts of the marine structure Marking damaged portions in need of reinforcement; Fabricating a FRP jacket from glass reinforced fiber plastic (FRP) and forming a plurality of epoxy grout inlets at appropriate intervals in the longitudinal direction of the FRP jacket; Installing the FRP jacket on a damaged portion requiring repair or reinforcement; Sequentially filling an injection valve from the lowest inlet located at the bottom of the plurality of epoxy grout inlets to the top inlet located at the top, thereby filling the grout filling space between the FRP jacket and the offshore structure step by step; And when the filling of the grout filling space is completed, curing for a sufficient time, separating the injection valve, and finally finishing the incineration method. To provide.

In this case, the FRP jacket is preferably translucent. And, in installing the FRP jacket on the damaged portion of the structure, the gasket member may be further included in the gasket insertion portion provided in the lower portion of the FRP jacket.                     

In addition, the present invention provides a repair and reinforcement member for use in the encasement method for repairing or reinforcing offshore structures, comprising: a FRP jacket made of translucent so that the state of injection of epoxy grout can be visually confirmed; A plurality of underwater epoxy grout inlets connected to the injection valve to enable filling of the underwater epoxy grout into the FRP jacket; A gasket insert formed under the FRP jacket to allow a gasket for sealing; And a plurality of protrusions provided on the inner surface of the FRP jacket so as to secure a grout filling space in which the epoxy grout for water can be injected between the inner surface of the FRP jacket and the marine structure. Provide the member.

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

1 is a side view of a repair / reinforcement member used in a method of repairing or reinforcing a marine structure according to the present invention. As shown in Fig. 1, the repair / reinforcement member according to the present invention comprises a FRP jacket 10 and a plurality of inlets 20 for injecting epoxy grout. The FRP jacket 10 is preferably made of semi-transparent so that the state of the injection of the epoxy grout in water can be visually confirmed, the thickness of the FRP jacket 10, the degree of damage of offshore structures requiring repair or reinforcement, and injection for repair or reinforcement It may be changed in consideration of the pressure due to the filling amount of grout, but should be maintained at least about 4mm. In addition, the FRP jacket 10 is preferably made of a material having excellent durability, high adhesion, wear resistance, impact resistance, corrosion resistance enough to ensure sufficient safety in a special marine environment. In addition, the plurality of injection holes 20 can be installed by setting an appropriate number in proportion to the length of the repair / reinforcement member. In addition, after the FRP jacket 10 is installed on the damaged portion of the offshore structure, it can be bonded using an underwater adhesive or the like, the bonding portion 30 is when viewed from the side after bonding the FRP jacket 10 to each other It indicates the joint surface that appears. On the other hand, the gasket insertion part 12 of the grade which can insert the gasket for sealing can be provided in the lower part of a maintenance / reinforcement member.

FIG. 2 is a plan view of the maintenance / reinforcement member according to the present invention shown in FIG. As shown in FIG. 2, the injection hole 20 is formed to be in a 90 degree direction from the junction 30 to which the FRP jacket 10 is bonded. A plurality of protrusions 22 are formed on the inner surface of the FRP jacket so as to secure a space where the epoxy grout for water can be injected between the inner surface of the FRP jacket 10 and the damaged portion of the structure. The protrusion 22 is preferably made of a processed polymer material, and may vary in size depending on the degree of damage of the target structure, but it is usually suitable to about 1cm. In addition, the protrusions 22 may vary in the number of their installations depending on the diameter of the damaged structure, but the spacing between each protrusion 22 should not exceed 50 cm.

In the method of repairing or reinforcing the offshore structure, by using the repair / reinforcement member as shown in Figs. 1 and 2, not only the repair or reinforcement air of the offshore structure can be shortened, but also the cost of repair or reinforcement can be reduced. It can save a lot.

3 is an enlarged cross-sectional view showing an enlarged joint 30 of the FRP jacket. As shown in Fig. 3, in order to bond the bonding surface 34 of the FRP jacket with an underwater adhesive and to prevent water or air from entering the FRP jacket 10 through the bonding surface 34. The stainless steel rivets or bolts 32 may be used to more firmly seal.

4 is an enlarged cross-sectional view of an injection port 20 for injecting an epoxy epoxy grout and an injection valve 24 connected to the injection port. As shown in Figure 4, the inlet 20 is connected to the injection valve 24 is fixed to the FRP jacket to fill the epoxy grout in the FRP jacket 10. In this case, the size of the injection hole 1B may be determined in consideration of the quantity of the reinforcing material that requires filling or the area requiring repair or reinforcement in order to repair or reinforce the damaged part of the structure.

5 is a view showing a state in which the injection valve 24 of FIG. 4 is connected to the injection port 20. The injection valve 24 is preferably made of PVC material, and should be one that can be completely screwed into the inlet 20.

FIG. 6 is a view showing a process of installing an FRP jacket on a damaged portion of an offshore structure and injecting an epoxy grout for water through an injection hole according to the present invention.

6A shows a state in which an offshore structure is damaged. Before the damaged part of the structure is constructed by the repair or reinforcement method according to the present invention, the surface pretreatment process of the marine structure must first be preceded. The surface pretreatment process is a two step process. In other words, using a high pressure washer or a hydraulic tool to remove oil, grease, rust, concrete fractures, etc., present in the damaged part of the structure, and weaken the adhesion of epoxy grout, such as underwater microorganisms inhabiting the damaged part of the structure. This step is to remove the substance. The second step is preferably carried out within 7 days of completing the first step, such as cleaning the damaged part of the structure, and it is also desirable to install a FRP jacket within 2 days of completing the second step.

Figure 6b shows a process for installing the FRP jacket 10 in accordance with the present invention to surround the damaged portion of the structure. It is desirable to check the state of the inside of the FRP jacket 10 before the construction of the process, as well as the state of the protrusion 2A for securing the space for the epoxy grout filling. In installing the FRP jacket 10 so as to surround the damaged part of the structure, the joint surface 30 formed in the FRP jacket 10 should be prevented from twisting in the vertical or horizontal direction so that the joint surface 30 can be overlapped and bonded. In order to temporarily fix the FRP jacket 10, a clamping or banding member made of stainless steel may be used. That is, when the FRP jacket is located in the damaged portion of the structure that needs repair or reinforcement, the FRP jacket is fixed to the structure by a clamp or the like. As such, when the FRP jacket 10 is fixed to the structure, the bonding surface 30 is then bonded using an underwater bonding agent.

FIG. 6C shows a state in which the gasket 14 is inserted into the gasket insert 12 provided under the FRP jacket 10. As shown in FIG. 6C, the gasket 14 is inserted into the gasket insert 12 provided under the FRP jacket and then bonded using an underwater adhesive, thereby generating voids between the marine structure and the FRP jacket. Do not do it. At this time, the gasket 14 to be used is preferably manufactured using a material having excellent corrosion resistance and durability. The curing time required until the gasket 14 is completely adhered may vary depending on the type of underwater adhesive actually used, but it is appropriate to cure about 4 hours. Once the process is complete, all preliminary preparations necessary for the injection of the epoxy grout in water are complete.

FIG. 6D shows a state in which the injection valve 24 is connected to the injection port 20a provided at the lowest end of the FRP jacket 10. FIG. That is, a diver such as a diver can connect the injection valve 24 to the injection port 20a located at the bottom of the FRP jacket 10, and then the underwater epoxy grout between the FRP jacket 10 and the marine structure. Fill by filling into grout filling space. At this time, it is preferable to appropriately adjust the injection speed or the like so that air or water in the FRP jacket 10 can be smoothly discharged or discharged. Furthermore, by manufacturing the FRP jacket 10 made of a material having a translucent, the underwater worker can visually check the filling state of the underwater epoxy grout with the naked eye. Once the underwater epoxy grout has been filled from the lowest inlet to the next lower inlet, close the injection valve to which the injection hose is connected. Then, as shown in Fig. 6E, the injection hose is disconnected from the lowermost inlet, connected to the next lower inlet, and the injection of the epoxy grout in water is resumed. The epoxy grout is filled to the top of the FRP jacket 10 in the manner described above.

FIG. 6F is a view showing a state where the epoxy grout is filled to the top of the FRP jacket 10. As shown in FIG. 6F, when the injection of the epoxy grout in water is completed, an underwater adhesive such as paste 42 or the like is used to tightly seal the top surface of the FRP jacket and the top surface of the marine structure. At this time, a coupling member such as a clamp temporarily used to fix the FRP jacket to the structure may be removed at the time when the epoxy grout for water is cured or may remain fixed as necessary. Then, after curing for a sufficient time, the injection hose is disconnected and finally surface finished to complete the repair or reinforcement process of the offshore structure.

FIG. 7 is a view showing a state of filling in the jacket corresponding to the sequential process diagram of FIG. In particular, as shown in Figures 7c, 7d and 7e, in the encasement method according to the present invention, the injection valve is located at the bottom of the FRP jacket 10 of the plurality of inlets 20a, 20b, 20c. By sequentially connecting from the inlet 20a to the inlet 20c located at the top, the underwater epoxy grout 40 is gradually filled in the grout filling space between the FRP jacket 10 and the offshore structure.

FIG. 8A is an enlarged cross-sectional view of the upper side of the FRP jacket 10 in FIG. 7 (f), and FIG. 8B is an enlarged cross-sectional view of the state where the gasket is inserted in the lower part of the FRP jacket in FIG. As shown in FIG. 8A, upon filling of the underwater epoxy grout 40 is completed, the top surface of the FRP jacket 10 and the top surface of the marine structure can be sealed using an underwater adhesive such as paste 42 or the like. Can be. In addition, under the FRP jacket 10, a gasket 14 is inserted between the marine structure and the FRP jacket 10 in a sealable manner as shown in FIG. 8B. The gasket 14 can completely block the continuous ingress of water or air from the bottom side of the FRP jacket 10.

9 illustrates another application embodiment for repairing or reinforcing a damaged portion of an offshore structure using the repairing or reinforcing method according to the present invention. This illustrates a method of repairing or reinforcing a damaged structure in accordance with the present invention when an offshore structure such as a bridge, harbor, breakwater, dam, etc. is damaged by continuous friction with fresh water or seawater, or crashing waves. As shown in FIG. 9, the FRP jacket 10 including the plurality of inlets 20a, 20b, and 20c is fixed to the damaged offshore structure using the fastening member 28. Then, the injection valve 24 is sequentially connected from the inlet 20a located at the bottom of the plurality of inlets to the inlet 20c located at the top thereof, so that the underwater epoxy grout is connected between the FRP jacket 10 and the marine structure. By filling the grout filling space 16 stepwise, it is possible to firmly repair or reinforce the damaged portion of the offshore structure. In particular, when the injection valve 24 is connected to the inlet 20c located at the top of the FRP jacket 10 to inject the epoxy grout for water, the air remaining between the FRP jacket 10 and the marine structure Alternatively, it is preferable to provide a specific size outlet 18 on the top side of the FRP jacket 10 so that water can be smoothly discharged.

Although the above has been described with reference to a preferred embodiment of the present invention, the present invention is not limited by the above-described embodiment and the accompanying drawings, it is various within the scope not departing from the technical spirit of the present invention described in the claims It will be apparent to those skilled in the art that substitutions, modifications, and variations are possible. Accordingly, all changes that come within the meaning or range of equivalency of the following claims are to be embraced within their scope.

As described above, according to the repair or reinforcement method of the marine structure according to the present invention, when the marine structure such as concrete pile, steel pipe pile, wood pile, etc. is damaged by corrosion, peeling, peeling, damage, erosion, deterioration, By using the repair and reinforcement member excellent in workability, the damaged part of the offshore structure can be repaired and reinforced firmly at a relatively low cost.

Further, according to the present invention, since grout is started from the inlet located at the bottom of the FRP jacket and finally the grout is injected at the top inlet, there is a possibility that air or water may remain inside the jacket as compared to the conventional method. Can be reduced. As a result, the generation of cracks due to bubbles or voids after construction can be reduced, and the life of the marine structure can be significantly extended.

Claims (6)

In the enclosure method for repairing or reinforcing the marine structure installed in fresh water or sea water, Identifying damaged parts of the marine structure and marking damaged parts requiring repair or reinforcement; Fabricating a FRP jacket from glass reinforced fiber plastic (FRP) and forming a plurality of epoxy grout inlets spaced in the longitudinal direction of the FRP jacket; Installing the FRP jacket in a damaged portion requiring repair or reinforcement; The injection valve is sequentially connected from the lowermost inlet located at the bottom of the plurality of epoxy grout inlets to the uppermost inlet located at the top, thereby gradually filling the grout filling space between the FRP jacket and the marine structure. Step IV; And When the filling of the grout filling space is completed, the incineration method for repairing or reinforcing the offshore structure, characterized in that it comprises a step (V) to cure for a predetermined time, after separating the injection valve, and finally finishing . The method of claim 1, further comprising, after step I, presurface treating the damaged portion of the offshore structure. 3. The method of claim 2, wherein the presurface treatment comprises removing at least one of oil, grease, rust, and concrete fracture surfaces present in the damaged portion of the marine structure using a high pressure washer or a hydraulic tool. Encasement method for repairing or reinforcing offshore structures, characterized in that it comprises at least one step of removing the microorganisms inhabiting the part. The method according to any one of claims 1 to 3, wherein the FRP jacket is translucent. The method of claim 1, further comprising inserting a gasket member into a gasket insertion portion provided below the FRP jacket in installing the FRP jacket on a damaged portion of the structure. Encasement method for repairing or reinforcing offshore structures. In the repair and reinforcement member used in the enclosure method for repairing or reinforcing offshore structures, FRP jacket made of translucent to visually check the injection state of the epoxy grout; A plurality of underwater epoxy grout inlets connected to an injection valve for filling the underwater epoxy grout into the FRP jacket; A gasket insert formed under the FRP jacket to allow a gasket for sealing; And Repair and reinforcement, characterized in that it comprises a plurality of protrusions provided on the inner surface of the FRP jacket, so as to secure a grout filling space in which the epoxy grout for the water can be injected between the inner surface of the FRP jacket and the offshore structure. absence.

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