KR100399152B1 - A Repairing Method for the Foundation of Bridge - Google Patents

Abstract

The present invention is a bridge substructure repair method for repairing a portion of the bridge substructure of the concrete structure eroded by flowing water or salty seawater, the F. R. P mold 30 directly to the outer surface of the bridge substructure By putting the mortar (B) in close contact with the corrosion, it is possible to reduce the overall construction cost while simplifying the repair.

Description

A Repairing Method for the Foundation of Bridge

The present invention relates to a bridge substructure repair method that can reduce the overall construction cost while simplifying the repair by repairing the corrosion of the substructure of the bridge made of concrete structure with flowing water or salty seawater.

Concrete structures are hardened by mixing cement, sand, and water at an appropriate ratio, and they can maintain their original strength even after a long time on the ground and in the ground.However, salt water and flowing water run off due to the poor adhesion between cement and sand. This is easy to happen. Underwater concrete structures are the bridge substructure. In the construction of bridge substructures, anticorrosive solvents may be mixed, but they are insufficient for perfect corrosion protection.

Recently, a method for repairing a corroded bridge substructure has been known in Korean Laid-Open Patent Publication No. 2000-12647. In other words, install a clamshell along the perimeter of the foundation well, select and remove the corroded area of the foundation well, pour the concrete by leveling and evenly surrounding the bottom of the foundation well, and then outside the foundation well. In the dry foundation well repair method, in which a concrete curing frame is installed in the building to form a new deposition film outside the original foundation well, the foundation membrane is installed (or underwater work) and corrosion of the foundation well is completed. Establish the foundation by compacting the surroundings and placing concrete, flange-fitting the prescribed FRP frame according to the outer circumference of the foundation well, and placing concrete in the space between the FRP frames to form a new deposition film of FRP frame outside the foundation well. It is a repair method.

As such, the conventional bridge substructure repair method repairs the corroded portion by installing a prescribed FRP mold along the outer circumference of the foundation well and placing concrete in the space between the foundation well and the FRP mold. It is true that by installing the FRP frame to protect the concrete along the circumference, it also has the advantage of preventing corrosion.

However, the conventional one has a problem in that construction cost is high because many materials such as inner frame, outer frame, angle, stainless mesh, and concrete are required to secure concrete having a certain cross-sectional area between the foundation well and the FRP frame. .

Accordingly, an object of the present invention is to provide a bridge substructure repairing method for reinforcing a corrosion part of a foundation of a bridge while preventing corrosion.

Another object of the present invention is to provide a bridge substructure repair method that can significantly reduce the construction cost by significantly reducing material requirements, unlike the conventional method that takes a lot of material.

1 to 3 are side cross-sectional views illustrating the process steps of the present invention.

Figure 4 is a cross-sectional plan view of the bridge substructure in the repaired state according to the invention

5 is a detailed view of portion “A” of FIG. 2;

FIG. 6 is a detailed view of part “B” of FIG. 3;

FIG. 7 is a detailed view of “C” part of FIG. 4. FIG.

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

10: bridge substructure 20: workbench

30: F. P. mold 30a, 30b: panel

31: injection tube 32: discharge tube

31a: Inlet 32a: Outlet

33: Packing 34: Outside fixation

35: Tightening nut 36: Closure

37a, 37b: flange 38: bolt

39: Packing A: Corroded part

B: Mortar

Hereinafter, the technical configuration of the present invention in detail.

Bridge substructure repair method of the present invention, as shown in Figures 1 to 4, a) to install a work platform 20 on the water of the existing bridge substructure 10 to be repaired (see Figure 1),

b) prefabricated the FRP mold 30, which can be wrapped around the outer surface of the bridge substructure 10 on the work platform 20, but is located in the corroded portion A of the bridge substructure 10. The injection mortar injection port 31a and the mortar discharge port 32a are drilled to install the injection tube 31 and the discharge tube 32, respectively (see FIGS. 2 and 5).

c) After cleaning the corroded portion (A) of the bridge substructure 10, the prefabricated F. P mold 30 is lowered into water and assembled to be in close contact with the outer surface of the bridge substructure (10) (Fig. 2),

d) injecting mortar (B) into the corroded portion (A) of the substructure through the mortar injection tube 31 until the mortar is discharged into the discharge tube (32) (see Figs. 1 and 2),

e) After the injected mortar is hardened to some extent, the injection tube 31 and the discharge tube 32 are removed, and the injection hole and the discharge hole are completed by filling the closing hole 36 (see FIGS. 3 and 6). .

The present invention constructed by such a process is to close the F. R. P mold 30 directly to the outer surface of the bridge substructure to fill the mortar (B) only in the corroded portion, the cross-sectional area is not significantly increased as conventional In addition, other materials do not take much. Here, mortar (B) is also included in the concrete according to the amount used.

In more detail, the working table 20 is made by installing barges, as shown in FIGS. In the workbench, the separated F. P. mold 30 necessary for the maintenance work is transported, and is preliminarily assembled into a cylindrical mold 30 according to a previously prepared drawing. At this time, the mold 30 should be preassembled along the circumference of the piers 11 so as to be wrapped around the lower structure (10). At this time, the assembly of the mold 30 should be larger than the appearance of the foundation to be installed. In addition, the injection hole 31a and the discharge hole 32a are installed in the mold portion to be positioned at the corroded portion of the foundation, respectively, and the injection tube 31 and the discharge tube 32 are installed, but the upper ends thereof have a sufficient length to come out of the water. (See Figure 5).

The primary assembled mold 30 is descended into the water so as to wrap the lower structure 10, the primary assembly to be in close contact with the base outer surface. At this time, the secondary assembly is the work to go into the water and tighten the bolts. Tighten tightly to prevent water from seeping into the mold. In order to prevent water from penetrating into the mold 30, it is preferable to insert the packing 33 into upper and lower inner peripheral surfaces of the mold 30 as shown in FIG. 3.

Then mortar is injected from the workbench through the injection tube (31). Inject until mortar flows into the discharge tube (32). When the mortar is hardened to some extent, the water enters the water, removes the injection tube 31 and the discharge tube 32, and fills the holes with the plug 36. The membrane tool 36 is preferably made of the same material as the mold, F, egg, and skin material.

5, the installation state of the injection tube 31 (the discharge tube is also the same) for injecting mortar into the corroded part A is shown in detail. The ends 31 are tightly fitted into the holes 31a and 32a of the mold 30, and the tubes 31 and 32 form a screw groove on the inner and outer circumferential surfaces, and the tubes 31 and 32 outside the mold 30. The outer fixing piece (34) welded to the end and the tightening nut (35) screwed to the end of the tube (31) (32) inside the mold (30). Therefore, tighten the tightening nut 35, the outer fixing piece 34 is in close contact with the mold and the tube is fixed.

6 shows a state in which the tube is removed after the mortar (B) is injected into the corroded portion. The tube is cut out, the outer fixing piece 34 is removed, and the screw is formed by screwing into the threaded groove 36 formed on the outer circumferential surface to be tightly coupled. The tightening nut 35 is embedded in the mold 30 as it is.

In FIG. 7, the assembled state between the panel 30a and the panel 30b which form the mold 30 is shown. Flange 37a, 37b which protrudes out of each panel is couple | bonded with the bolt 38. As shown in FIG. It is also desirable to insert the packing 39 between the flanges to increase water tightness. Meanwhile, the packing used in the present invention uses a water-expandable packing material that expands upon absorption of water, and the bolt uses a metal that does not rust.

As such, the bridge undercarriage repair method of the present invention is to close the F.R.P mold 30 directly to the outer surface of the undercarriage so that the mortar is filled in the corroded portion. Has an effect,

In addition, since there is no material required other than the F. P. mold 30 and mortar, it has an effect that can significantly reduce the material cost compared to the prior art.

Claims (4)

delete delete a) install the work platform 20 on the water of the existing bridge substructure 10 to be repaired, b) Morphological inlet to the part to be located in the corroded portion of the bridge substructure 10, while prefabricating the FRP frame (30) that can wrap the outer surface of the bridge substructure 10 in the workbench 20 (31a) and the mortar discharge port (32a) is drilled to install the injection tube 31 and the discharge tube 32, respectively, c) lowering the prefabricated F. R. shaped frame 30 into water and assembling it to be in close contact with the outer surface of the bridge substructure 10; d) injecting mortar into the corroded portion through the mortar injection tube 31 until the mortar is discharged into the discharge tube 32, e) in the bridge substructure repair method, which is completed by removing the injection tube 31 and the discharge tube 32 after the injected mortar is cured and filling the injection hole 31a and the discharge hole 32a. The tube is a tube 31, 32, the end of which is tightly fitted into the hole of the mold 30, the outer fixing piece 34 welded to the tube 31, 32 outside the mold 30, Bridge substructure repair method characterized in that it consists of a tightening nut (35) screwed to the end of the tube (31) (32) inside the mold (30). The method of claim 3, The joining structure between the panel 30a and the panel 30b constituting the mold 30 couples the flanges 37a and 37b protruding out of the panel with bolts 38 and inserts a packing 39 between the flanges. Bridge substructure repair method characterized in that.