KR20000012647A - A method and struture of bridge pier mould construction repair - Google Patents

Abstract

PURPOSE: A repairing method of a fundamental well tank for a bridge is provided to prevent water contamination and an early corrosion of concrete and to save cost for maintenance by saving the cost invested on construction. CONSTITUTION: The repairing method includes the steps of: forming an evaporation film consisted of a FRP frame on the outer part of a fundamental well tank by installing concrete between the FRP frames after combining the provided FRP frame with a flange along with the outer rim of the fundamental well tank and forming a fundamental stand by installing stones and submarine concrete around the bottom of the fundamental well tank; dropping the FRP frame to the bottom of the fundamental well tank under water after vertically and horizontally combining with the flange.

Description

A method and struture of bridge pier mold construction repair}

The present invention relates to a bridge foundation well repair method, and more particularly, to replace the well repair method by steel sheet formwork and underwater concrete pouring, thereby significantly reducing the cost and process of dropping the construction while preventing river water pollution and premature corrosion of concrete. It is about bridge foundation well repair method which can reduce economical and maintenance cost.

Bridge construction is known by filling wells using wells to build bridges in bridge construction.

In general, the form of the well used in the well filling method is to use the iron sheet formwork as shown in FIG. The base well formwork formwork is divided into an inner griddle formwork (1) and an outer griddle formwork (2) to make a metal grid, and an angle is placed between the inner griddle formwork (1) and the outer griddle formwork (2) to maintain a constant gap. It is designed to function as a tension member and structurally designed to be safe from lateral pressure.

When the bridge is constructed by the well filling method, the inner steel sheet formwork (1) is completely buried in concrete because the bridge structure is made by filling concrete between the inner steel sheet formwork (1) and the outer steel sheet formwork (2).

In the case of using a metal sheet formwork, the external sheet metal formwork (2) is oxidized little by little (about 0.9 mm) every year in water, and the thickness erosion phenomenon becomes thinner, and there is a disadvantage of accelerating concrete corrosion over time.

In particular, the iron formwork in the water source water is oxidized to release a large amount of harmful substances containing iron to become a pollution source of the water source, and as the corrosion progresses, the strength of the pier structure is gradually weakened, which reduces the safety of the pier. If the safety of the structure due to oxidation or concrete erosion or degradation of scour is found, the underwater structure is repaired.

In general, the bridge foundation underwater structure repair method has been dependent on steel sheet formwork and underwater concrete pouring.

In the case of bridge foundation wells, in the initial stage of construction, the steel sheet formwork is used to pour the filled concrete and to cure the structure.In the case of local damage or cracking, the structure is made of steel plate around the part. It is repaired by placing the formwork and pouring underwater concrete again.

As a method for repairing the foundation well and the underwater structure made using the iron sheet formwork, the dry working method and the underwater working method are known.

The dry working method first installs a random barrier on the periphery of the foundation well as shown in FIG. 2 (S1), and then removes the concrete of the corroded portion of the foundation well (S2), and the bottom of the foundation well. Compacting and pouring concrete (S3). And reinforce the reinforcement around the foundation well (S4), and again install the iron sheet formwork by electrical welding (S5), and the concrete is placed and cured in between (S6), when the concrete curing is finished dismantle the iron sheet formwork In step (S7) of removing and installing the temporary barrier, the method of forming a concrete deposition film on the corresponding part and the remaining part of the newly damaged foundation well.

Underwater working method first puts a sheet pile (Sheet Pill) around the foundation well (S1), and removes the water between the foundation well and the sheet pile to remove the water (S2). Then squeeze around the foundation well and pour concrete and reinforce the reinforcement around the foundation well (S3). Then, by electro-welding the iron sheet formwork is installed around the base well, the concrete is poured into the iron formwork and cured (S4). When the concrete curing is finished, the iron sheet formwork is dismantled and the sheet pile is drawn (S5) to finish the repair work.

Since the dry / underwater repair work method has been practiced for a long time, there is a lot of experience and know-how, so it is not difficult to apply the method, and it is advantageous to supply and provide the material that is dropped there. Because it is difficult to handle and functionally, the steel formwork exhibits structural defects that are oxidized in water, which does not guarantee a long life, and has the disadvantage of accelerating the corrosion of concrete. The parts showed cracks or defects, and in the case of aftercare, the steel plate was welded into a structure, so the cracks and cracks were so frequent that the underwater welding repair work increased, resulting in difficulty in maintenance and salinity in the sea or river. Or rescue by fish and shellfish There is a problem that is difficult to maintain due to a lot of influence on the environment, such as being exposed to the synergy of water corrosion.

It is therefore an object of the present invention to provide a new repair method suitable for repairing the basin well.

Another object of the present invention is to provide a new foundation well repairing structure that can be suitably used for repairing the foundation well.

The characteristics of the present invention for achieving this object is to install a clamshell around the foundation well, go through the process of selecting and removing the corroded portion of the foundation well, compacting and evening around the bottom of the foundation well, In the dry foundation well repair method of forming a new deposition film outside the original foundation well by installing a concrete curing mold outside the foundation well after pouring,

After the installation of the temporary curtain and the removal of the corresponding part of the foundation wells, compact the concrete around the foundation wells and pour concrete, and install the flanges of the prescribed FRP frame along the outer periphery of the foundation wells. It is characterized by repairing the foundation well by forming a new deposition film consisting of the FRP frame outside the foundation well by pouring.

Another feature of the present invention is to install a structure around the foundation well and then remove the water between the well and the structure and install a concrete curing frame on the outside of the concrete by placing a new deposition film outside the original foundation well In the submersible foundation well repair method to form,

The diver removing and cleaning the corroded portion of the basal well from the water;

Forming a foundation by placing stones and underwater concrete around the bottom of the foundation well;

Forming the foundation table and flange-joining the FRP frame prepared in advance on the workbench in a vertical / horizontal manner to slowly lower the foundation well in the water;

Maintaining the installation position of the FRP frame by rotating a gabion along the lower surface of the FRP frame to suppress the floating force caused by buoyancy from the position where the FRP frame is lowered along the foundation well;

Placing the underwater concrete between the spaces provided in the FRP frame to cure the concrete in the water, characterized in that for repairing the foundation well by a new deposition film made of FRP frame.

Another feature of the present invention is an inner frame having a linear or nonlinear curvature on the inner surface determined according to the shape and the circumference of the foundation well and an arbitrary spaced distance from the inner frame to form a concrete pouring space. An FRP frame body consisting of an outer frame forming an outer wall of the foundation well and having a flange at each node,

Between the inner frame and the outer frame concrete inclined space constructed through the inclined angle inclined in the downward direction and several angles in the horizontal direction,

Located in the lower space of the concrete casting space and stainless steel mesh installed along the space of the inner frame and outer frame to block the discharge of concrete,

When the inner frame and the outer frame is placed on the base of the underwater, characterized in that the foundation well repair structure having a support extending outward to form an outwardly extending support surface to receive a load of heavy.

1 is a view showing a bridge foundation well

Figure 2 is a flow chart for explaining the conventional dry foundation well repair method

Figure 3 is a flow chart for explaining the conventional underwater basin well repair method

Figure 4 as showing the dry repair frame according to the present invention

(a) a plan view

(b) front view

Figure 5 shows an example of the maintenance work for repairing the basic well according to the present invention (a) ~ (f) is a view showing a maintenance work progress state

Figure 6 shows that the repair frame is applied to the present invention

(a) is an external flange joint frame,

(b) is a perspective view showing an internal flange joint frame

7 is a cross-sectional view of the flange joint enlarged in part (b) of FIG.

Figure 8 (a) ~ (d) is a view showing the water maintenance work state of the foundation well according to the invention

9 is to show a repair frame according to the present invention

(a) a plan view

(b) is sectional drawing along the line B-B 'of (a).

10 is to show a repair frame according to the present invention

(a) a plan view

(b) is a sectional view taken along the line C-C 'of (a)

* Description of the symbols for the main parts of the drawings *

3: basal well 4: cloak

7: FRP frame 9: Flange

10: Foundation 11: Onboard Workbench

12: Gabion 15: Coupling

16: Inner frame 17: Outer frame

18: pouring space 19: angle

20: stainless steel mesh 21: support

Regardless of dry and underwater repairs, the foundation wells can be repaired by using a pre-planned FRP as a base material, eliminating concrete corrosion and release of iron, thereby reducing structural safety and water pollution, thereby improving reliability of foundation wells. It is possible to reduce the cost by reducing the amount of work and to reduce the work volume, and to increase the durability while reducing the maintenance air, and to improve the overall safety of the bridge by reducing the burden on after-care.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The present invention applies the FRP mold (7) in both dry and underwater repair method.

In the dry repair method, as shown in FIGS. 4 and 5, first, a temporary barrier 4 is installed along the periphery of the foundation well 3 (FIG. 4A), and the corresponding corrosion portion 5 of the foundation well 3 is corroded. After the process of selecting and removing (Fig. 4b), the concrete around the bottom of the base well (3) to squeeze and pour the concrete (Fig. 4c), and then the concrete curing frame outside the base well (3) In the dry foundation well repair method, which is installed to form a new deposition film outside the original foundation well (3), after the installation of the temporary film (4) and removal of the corresponding part of the foundation well, the surrounding area of the foundation well (3) Pour concrete and install the FRP frame 7 defined by the flange joint along the outer periphery of the foundation well 3 (FIG. 4D), and place the concrete 8 in the space between the FRP molds 7; It is poured (FIG. 4E), the temporary barrier 4 is removed (FIG. 4F), and the FRP mold 7 is formed outside the foundation well 3. To form a deposition layer peaceful and complement the basic right bucket.

The shape of the FRP frame 7 used herein applies the shape of the external type FRP frame 7 as shown in FIG. 6 (a), which is possible as shown in FIG. 6 according to the flange bonding method, and according to the condition of FIG. An internal FRP mold (7) is used. The shape of the FRP frame 7 is suitable for repair on the surface, and the external horizontal and vertical flange joints are used for dismantling. However, the bridges related to the seawater are concrete and composite structures as shown in FIG. (9) The joining structure is applied.

The FRP mold 7 is divided into two to four or more pieces according to the diameter or shape of the foundation well 3 to form a deposited film of the foundation well 3.

Figure 4 is a model of the FRP frame 7 is coupled to the flange joint of the FRP frame divided into two stages upper / lower.

In the underwater repair method, as shown in Figure 8 after installing the structure around the foundation well (3) to remove the water between the well and the structure and install the concrete curing frame on the outside of the original foundation well by pouring concrete In the submersible basin well repair method of forming a new deposition film in the water, the step of the diver removes and cleans the corrosion area (5) of the basin well (3) in the water (S1), the periphery under the basin well (3) Step of forming the foundation 10 by pouring stones and underwater concrete in (S2), flange formation of the pre-prepared FRP frame 7 in the ship platform 11 with the formation of the foundation 10 in the vertical / horizontal Step (S3) to gradually lower the base water tank (3) in the water phase, FRP frame (7) to suppress the flotation force caused by buoyancy from the position where the FRP frame (7) is lowered along the base well (3) Turn the gabion (12) along the bottom surface of 7) F Maintaining the installation position of the RP frame (7), and placing the underwater concrete between the space provided in the FRP frame (7) (S4) to cure the concrete in the water to the foundation well by a new deposition film outside the foundation well Repair.

The form of the FRP frame 7 used here applies the form of the internal type FRP frame 7 as shown in FIG. 6 (b) according to the flange joining method. The shape of the FRP frame 7 is suitable for underwater repair and uses the internal horizontal and vertical flange 9 joint structure as shown in FIG. 7, and the gasket louver 13 between the flange joint end faces as shown in the flange joint detail of FIG. 7. Insert into the bolt (14) is applied.

This underwater repair method is high and wide foundation well, so that crane work or installation of a ship platform can be installed, and it is limited to a condition that has a depth enough for a barge to carry a barge or a bridge in which the foundation well is not buried in a bed. And if the overload load is expected due to the middle of the main well repair company, it is repaired by using the structural lightweight aggregate, and it is applied when the underwater work is possible because the river is not polluted.

To remove and clean the corrosion of the foundation well by the diver first, insert and fix the coupling 15 therebetween to fix the foundation well and the FRP frame (7), and pour curing A deposition film is formed on the outside of the foundation well 3.

The shape of the FRP frame 7 is an inner frame 16 having a linear or nonlinear curvature on the inner surface determined according to the shape and circumference of the base well 3 as shown in FIG. 10 and an arbitrary distance from the inner frame 16. FRP frame body consisting of an outer frame (17) and an flange formed on each node and formed with an outer frame (17) forming an outer wall of the foundation well while being formed at an angle to form a concrete pouring space, the inner frame (16) and the outer frame ( The concrete placing space (18) constructed through the inclined angle (19) inclined downward and several horizontally horizontal angles between the inclined direction and the lower space of the concrete placing space The stainless mesh 20 installed along the space of the inner frame 16 and the outer frame 17 and the inner frame 16 and the outer frame 17 to be blocked to receive a heavy load when placed on the foundation of the underwater To extend the support surface outward A type having the extending portion 21 to the outside in order to sex.

The form of this structure is particularly advantageous in underwater repair methods. The mesh 20 in the space of the inner frame 16 and the outer frame 17 helps to prevent a considerable amount of concrete outflow, and the support portion 21 can be placed on the gabion (0, etc.) in underwater repairs. It is effective in preventing the injury of the FRP frame (7).

The repair method of the present invention without using a dry / underwater repair method is to use the FRP mold (7). The FRP frame 7 forms a circular or elliptical frame intended only by vertical flange joints, and forms a multi-stage circular or elliptical frame with horizontal flange joints only, and then places underwater concrete in this frame for repair work. To complete. The material used here is FRP, a reinforced plastic. FRP is a composite material of unsaturated polyester resin and glass fiber, which is stronger than iron, lighter than aluminum, and has almost permanently reinforced plastic. Until now, most of the elements that required corrosion resistance were made of metal materials, and corrosion resistant resins were mainly used as lining materials. In terms of corrosion resistance, FRP is far ahead of metal materials, and has a lower cost than metal materials and has good mobility due to installation and weight reduction, so that labor cost is low, there is no problem of rust in water, and it requires little maintenance. In addition, it has a high degree of freedom in design processing, excellent thermal insulation, no ion dissolution, appearance appears in color, beautiful appearance, no painting, strong adhesion to non-metals such as cement, and excellent insect repellency. These characteristics of FRP material can be used as a structural material to protect concrete or to cure concrete. For example, the problem of rust prevention and concrete corrosion seen in foundation well can be It could be solved simply by surface treatment with FRP material.

Rather than simply attaching FRP material to the foundation wells to repair the foundation wells, the repair of the foundation wells by the FRP mold containing concrete curing as in the present invention is followed by reinforcement and scour caused by concrete corrosion or flooding. In addition, various defects such as rusting can be eliminated, and there is little construction trouble or cost increase for the application of the FRP framework, and it is more advantageous for the post management.

According to the present invention, by repairing the outer wall of the foundation well by covering the FRP structure, there is an effect that can cause the problems of iron plate form underwater oxidation and underwater concrete corrosion at low cost, and easily applied to various repair methods The construction reliability is high, and by the relatively simple construction method, the outer wall structure of the foundation well can be repaired to semi-permanent structure, and there are various effects that can reduce the cost of follow-up management.

Claims (3)

Install a clam around the foundation wells, and select and remove the corroded parts of the foundation wells, compact the concrete around the bottom of the foundation wells, and cast concrete to cure concrete outside the foundation wells. In the dry foundation well repair method of installing a mold to form a new deposition film outside the original foundation well, After the installation of the temporary curtain and the removal of the corresponding part of the foundation wells, compact the concrete around the foundation wells and pour concrete, and install the flanges of the prescribed FRP frame along the outer periphery of the foundation wells. A method of repairing a bridge foundation well, characterized in that for repairing the foundation well by forming a new deposition film made of FRP frame outside the foundation well by pouring. An underwater foundation well that installs structures around the foundation wells, removes water between the wells and the structure, and installs concrete curing molds on the exterior to form new deposits outside the original foundation wells. In the repair method, The diver removing and cleaning the corroded portion of the basal well from the water; Forming a foundation by placing stones and underwater concrete around the bottom of the foundation well; Forming the foundation table and flange-joining the FRP frame prepared in advance on the workbench in a vertical / horizontal manner to slowly lower the foundation well in the water; Maintaining the installation position of the FRP frame by rotating a gabion along the lower surface of the FRP frame to suppress the floating force caused by buoyancy from the position where the FRP frame is lowered along the foundation well; The method of repairing a bridge foundation well, characterized in that the foundation well is repaired by a new deposition film made of FRP frame by placing concrete under water by placing concrete between the spaces provided in the FRP frame. An inner frame having a linear or nonlinear curvature on the inner surface determined according to the shape and circumference of the foundation well and an angle at any interval with the inner frame to form a concrete pouring space while forming the outer wall of the foundation well FRP frame body consisting of an outer frame and having a flange on each node, Between the inner frame and the outer frame concrete inclined space constructed through the inclined angle inclined in the downward direction and several angles in the horizontal direction, Located in the lower space of the concrete casting space and stainless steel mesh installed along the space of the inner frame and outer frame to block the discharge of concrete, Structure for repairing bridge foundation wells having an outwardly extending support to form a support surface extended in the outward direction to receive a heavy load when the inner frame and the outer frame is placed on the base of the underwater .