KR20010099341A - Dry construction method of substructure under bridge - Google Patents

Abstract

The present invention relates to the underwater dry construction method of the bridge submerged structure, which is made for the reinforcement of the lower submerged depth of the bridge, and is made by forming an AFRP cover in the form of a panel around a corroded and damaged foundation well. ) It is easy to assemble by connecting method. In order to prevent the penetration of water and increase the reinforcement of the connection construction part, the high strength aramid fiber is cut in the direction of 10cm in width and reinforced with epoxy resin, and the assembled AFRP panel cover is pier underwater. In order to prevent the water that surrounds the structure and permeates the bottom surface of the bottom of the structure, a submerged construction method is provided at the bottom of the AFRP cover flange by installing a barrier composed of a composite structure.

Description

Dry construction method of submarine bridge substructure

The present invention relates to the dry construction method of concrete underwater structures for repairing and reinforcing damaged and damaged concrete in the bridge underwater depths of bridges.

Known in Korea for bridge foundation well reinforcement methods, there are dry work and diving work.

The dry construction method is constructed in a dry way in areas where the height of bridge foundation wells is not large and crane work or barge operation is impossible, and material transportation must be carried by road.

At this time, temporary screening is essential, and after removing the corroded concrete such as watering and digging, the foundation concrete is poured in dry condition, the reinforcement is installed and the final concrete is poured and cured.

In places where there is a depth and barge service, it is economical to construct it underwater because it is economical.

Among the FRP synthetic resins, the organic fiber and the metal net having high tensile strength and impact resistance to abrasion resistance are embedded in the FRP, and the organic fiber is a composite material structure in which a rigid composite structure is molded in the surface layer. The primary purpose of the present invention is to install a barrier to prevent this penetration and to place concrete in the dry construction method underwater.

In the past, repair and reinforcement have been constructed by submerged concrete-filled concrete filling method of installing concrete barriers, removing corroded concrete, installing iron formwork, and then placing concrete.

It is also known as the bridge undercarriage construction method, which is patented under Patent No. 163475, which breaks the concrete in the wells, assembles the reinforcing bars and the upper reinforcing bars, assembles the FRP cover around the wells, and puts ready-mixed concrete for water pollution. It is said that it is semi-permanent construction because there is little concern of corrosion and crack of the well is prevented.However, it is a method that puts the wear and tear of concrete at the bottom of the pier under the pier, and puts concrete.The structure of the bridge pier is a cylindrical FRP cover. It becomes the composition that cannot be covered

Unlike the above configuration, there is a filed 10-2000-0018287 reinforcement plastic structure filed by the applicant of the present application, which is a high-strength metal mesh integrally molded inside the FRP panel and four FRP panels Wrap the damaged part and pour concrete mortar between them,

The reinforcement of the structure combined with the reinforced resin fiber No. 10-2000-0031732 filed by the applicant of the present application is applied,

In the reinforcement of panel projecting flanges by forming wire mesh layer in FRP reinforcement and composed of internal and external resin layer and central resin layer, double wire interpolate outwardly or construct carbon fiber layer and aramid fiber layer on outward surface instead of these. FReinforcement or boron fiber layer which replaced strand mat layer and cured resin, carbon fiber layer was formed on the outward side, and boron fiber layer and outward side on the aramid fiber layer and carbon fiber layer, so that the FRP cover was cracked in water. It is characterized by constituting a rigid reinforcement and formwork, characterized in that the reinforcement of defects damaged by the impact of sand, gravel, etc. with high stiffness,

Recently, since the FRP cover is installed around the bottom of the bridge basin and the concrete is placed under water, it is said to be semi-permanent due to less corrosiveness caused by air shortening and water pollution.However, it is difficult to verify the filling state when placing concrete under water. Underwater dry construction method should be used. In this case, to prevent the penetration of water that penetrates to the bottom of the subsurface, a thick sponge is applied to the surface and the assembled FRP cover is installed.

At this time, there is a problem of pouring concrete in a state that does not achieve a sufficient dry state.

The present invention is a long-term research, data collection, and repeated experiments to fundamentally solve and supplement these conventional drawbacks. As a visual inspection is possible and the parts can be repaired directly,

Underwater bridge construction method for reinforcement of submerged bridge under the bridge under the corrugated and damaged foundation well is manufactured in the panel type AFRP cover with excellent impact resistance and abrasion resistance. By cutting the aramid fibers in the direction and re-reinforcing with resin, etc., it prevents water permeation and enhances the reinforcement of weak connection construction parts. In order to prevent the penetration of water from the bottom surface of the water around the bottom of the water, the same principle as the barking method is applied to the soft composite structure (including rubber plate) at the bottom of the AFRP cover "┛" shaped flange. AFRP cover assembled by attaching to bottom of flange It is described in detail by the accompanying drawings as to protect the infiltration of water by pressing down and pressing the vertical down vertically as follows.

1 is a dry construction method method of the present invention

Figure 2 is an exemplary cross-sectional view of the aramid fiber sheet covering the panel seam of the present invention

3 is an aramid sheet used in the present invention

Figure 4 is an exemplary view of reinforcing aramid fibers in the longitudinal direction in the panel seam connection interval in the present invention

5 is an exemplary view of a state in which the aramid sheet used in the present invention is reinforced in the longitudinal direction to the panel connection interval portion;

Figure 6 is a perspective view of a state of overlapping when using the aramid fibers in the present invention to form a junction

Figure 7 is an exemplary cross-sectional view of the state of reinforcing the joint portion by overlapping when using the aramid fibers of the present invention

A panel (4) (4 ') consisting of a flange (5) is abutted on the corrosion damage (2) at the bottom of the pier (1), and the composite support structure (8) is attached to the bottom of the bridge by a strong adhesive (6) layer. Then, the anchor bolt (7) is inserted around the flange (5) to prevent water from penetrating into the bottom of the panel, and then the flange (5a) (5b) between the panel (4) (4 ') and the upper and lower panels. ) Aramid fibers (10) (11) for preventing breakage and leakage in the gaps (14) (14 ') (15) (15') and the center gap (16) of the seam are connected in length and transverse directions or joints (12). ) Is characterized in that the reinforcement to be a constituent bonded aramid sheet (13),

When explaining the operation of the present invention as follows.

In order to repair the lower corrosion damage part 2 of the pier (1), a temporary curtain is installed around the pier (1) to investigate the ground characteristics and environmental characteristics, and to check the tidal currents, tides, waves, wind volume and wind speed, flood level, flow velocity, and flow rate. Considering the surrounding environment, etc.

As shown in FIG. 1, a panel reinforcement 4 and 4 ′ are installed around the piers 1. The bottom flange 5 of the panels 4 and 4 ′ has a synthetic bearing having elasticity as a strong adhesive 6. Bond the structure (8) and install the anchor bolt (7) at any suitable point so as not to get into the bottom gap of the panel reinforcement (4) (4 '), and then to pour out the water inside. I use a pump,

Here, the composite support structure 8 may be configured to protrude to the inside or the outside as shown by the dotted line, but the leakage is blocked even if configured to the same extent as the width of the flange (5),

Next, by chipping the corrosion damaged part (2), sanding or wire breaking the concrete surface, and then using a water jet to clean it and then reinforce the repair by pouring the foundation concrete. do,

Panel reinforcement (4) (4 ') should be composed of FRP cover before concrete casting.After checking the assembly condition, check the safety condition and checking the leakage state to the bottom of the tightening state of anchor bolt (7). Panel reinforcement (4) (4 ') itself is reinforced with metal mesh inside and coated with carbon fiber layer, aramid fiber layer, or chopped strand mat layer boron fiber layer, etc. Flow velocity and impact of stones, sand, gravel, etc. are caused by the gap between the connection gaps 14, 14 ', 15 and 15' of the panel reinforcement 4, 4 'and the flange connection center gap ( It should be applied between 16) so that early breakage is not easily done.

Figure 2. Figure 4. As shown in Fig. 5, the gaps 14, 14 ', 15, 15' and 16, which are weak points of the jointed portions of the flanges 5, 5a and 5b, are replaced with the aramid fibers 10 of Fig. Reinforce the sheet by overlapping the gap (15) (15 ') or the gap (14) (14') with the width (11) or the width (11) (10), especially the flange connection center clearance (16). In the case of Figure 2. Figure 6. As shown in FIG. 7, the aramid sheet 13 layer is formed by overlapping the aramid fibers 10 and 11 so as to reinforce the joint 12, thereby strongly protecting and reinforcing the connection center gap 16.

In this way, when the dry construction method is completed, there is no abrasion or breakage of damage even in the rapid flow or sudden blow of the strong sand and gravel boulder from the outside.

Thus, the present invention connects a panel around damaged corrosion damaged part for repair reinforcement of the submerged submerged depth of the pier to prevent the penetration of water from the flange connection gap and to prevent damage from the gap from the impact of sand and gravel. It is an effective dry construction method that can extend the service life semi-permanently after construction because the composite supporting structure of the panel bottom flange part on the panel is bonded with strong adhesive and fixed by anchor bolt. .

Claims (1)

In the method of placing the panel 4, 4 'which comprises the flange 5 in the corrosion damage part 2 of the lower part of the piers 1, Attach the composite support structure (8) to the bottom surface with a strong adhesive layer (6) and settle it. Then, a plurality of anchor bolts (7) are inserted around the flange (5) to prevent leakage to the bottom of the panel. ) And gaps between the flanges (5a) and (b) of the flanges (5a) and (b) between the panel (4 ') and the upper and lower panels (14), (14') (15) (15 ') and the center (16). The aramid fibers (10) and (11) cross the longitudinal direction, the transverse joint portion 12 is reinforced construction so as to be bonded aramid sheet 13, dry construction method of the bridge submerged underwater structure.