KR200230257Y1 - A Repair Structure of Bridge Pier Mould Construction - Google Patents

Abstract

The present invention relates to a structure for repairing foundation wells using an FRP frame considering the economic feasibility and constructability, which prevents water and marine pollution and premature corrosion of concrete while reducing the cost, process, and maintenance costs.

The foundation well repairing structure according to the present invention includes a horizontal groove section steel 12 determined according to the shape and circumference of the foundation well 10 and a vertical groove section steel 13 for maintaining the shape while reinforcing the horizontal groove section steel 12. Protrudes in the direction of the foundation well 10 around the intersection of the frame consisting of the frame, the FRP layer 14 that is overlaid on the outside of the frame, and the horizontal grooved steel 12 and the vertical grooved steel 13 of the frame. It is characterized in that it is made of a bolt housing 15 is installed, and the adjustment bolt 11 is coupled to the bolt housing 15 to support the FRP mold 11 in the base well (10). Accordingly, in repairing the foundation well, eco-friendly construction, shortening of the air, and economical efficiency are increased.

Description

A Repair Structure of Bridge Pier Mold Construction

The present invention relates to a structure for repairing a foundation well using an FRP frame, and more specifically, to repair a foundation well by steel plate formwork and underwater concrete pouring, and to replace the disadvantage of a structure using an FRP frame composed of an inner / outer frame. This is a repair structure for the foundation well repairing structure using the FRP frame considering the economical and constructability to reduce the cost, process and maintenance cost of the construction, while preventing water and marine pollution and premature corrosion of concrete. will be.

In general, in the case of constructing the bridge by the well filling method, the well bucket 3 is constructed using the iron plate formwork as shown in FIG. 1. The base well formwork frame used for the construction of the wells (3) is divided into an inner sheet metal formwork (1) and an outer sheet metal formwork (2), which is made of a metal grid, and between the inner sheet metal formwork (1) and the outer sheet metal formwork (2). The angle was designed to function as a tension member at regular intervals, and structurally designed to be safe for 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.

The general repair procedure for foundation wells has been dependent on sheet metal formwork and underwater concrete placement. In other words, 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 make the structure through curing process. Is repaired by pouring the concrete again.

As a work method for repairing a basic well and an underwater structure made using a sheet metal formwork, a dry work method and an underwater work 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), install the new again by electro-welding the sheet metal formwork (S5), the concrete is placed between the curing and curing (S6), after 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 damaged foundation well.

Underwater working method is first put a sheet pile (Sheet Pill) around the foundation well as shown in Figure 3 (S1), and removes 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 along 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 plate formwork is dismantled and the sheet pile is pulled out (S5) to finish the repair work.

Since dry / underwater repair work has been carried out for a long time to repair basic wells, there is a lot of empirical know-how, so it is not unreasonable to apply the method, and the procurement and supply of dropped materials, etc. is advantageous. Difficulties and structural structural problems such as steel formwork oxidizes in water and concrete corrosion accelerates, design, fabrication, and construction are difficult, due to the large number of welding operations, poor workability, and joints cause cracks or defects. Since the steel plate is welded into a structure, there are many cracks and cracks, which increases the amount of underwater welding repair work, which makes it difficult to maintain and exposed to corrosion by salt or fishery in the sea or rivers. There was a problem.

In addition, as a method using the FRP frame, as shown in Figure 4 the inner frame 4 in contact with the outer wall of the base well 3, the outer frame 5, the inner frame 4 and the outer frame spaced apart from the inner frame 4 The method of repairing the foundation wells by stacking the concrete placing spaces (6) made by the intervals of (5) and the FRP frame (8) having an angle (7) structure placed in the placing spaces (6) around the foundation wells is also known. In the case of the dry / underwater repair method using the FRP mold (8), the sheet pile is put around the foundation well (3), water is removed, and the FRP mold (8) is installed to install the concrete. Construction problems such as construction delay and economic feasibility caused by installation were great.

Therefore, an object of the present invention is to provide a structure for repairing a foundation well for repairing the foundation well in a relatively simple manner in repairing the foundation well using an FRP frame.

A feature of the present invention for achieving this object is a frame consisting of a horizontal groove section steel determined according to the shape and circumference of the foundation well and a vertical groove section steel to maintain the shape while reinforcing the horizontal groove section steel,

An FRP layer overlaid on the outside of the frame,

A bolt housing protruding in the direction of the base well centering on the intersection of the horizontal groove section steel and the vertical groove section steel of the frame;

Coupled to the bolt housing is characterized in that the structure consisting of repairing the foundation wells consisting of a control bolt for supporting the FRP frame in the foundation well.

1 is a view showing a bridge foundation well

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

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

Figure 4 shows a conventional dry repair frame

(a) is a top view (b) is sectional drawing of the A-A line of (a)

5 is a schematic diagram of a structure for repairing a foundation well according to the present invention;

Figure 6 as showing the structure for repairing the base well according to the present invention

(a) is the front view (b) is the top view

7 is a repair method flowchart of the present invention

Figure 8 (a) ~ (f) is an explanatory diagram showing the basic well-pit dry repair method according to the present invention in order

Figure 9 (a) ~ (e) is an explanatory diagram showing the basic well water reservoir repair method according to the present invention in order

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

10: Foundation well 11: FRP frame

12: Horizontal Groove Section Steel 13: Vertical Groove Section Steel

14: FRP layer 15: bolt housing

16: Adjustment bolt 17: Rebar assembly net

18: unseparated concrete 19: tent

20: Corrosion site 21: Concrete (base)

23: Base 24: Onboard Work Platform

25: underwater concrete

The repair structure of the present invention can provide a foundation well repair method in which the FRP frame itself serves as a seat pile without installing a sheet pile, thereby reducing construction cost and being advantageous for shortening the air.

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

The repair structure of the present invention, as shown in 5 and 6, to maintain the shape while reinforcing the horizontal groove section steel 12 and the horizontal groove section steel 12 determined according to the shape and circumference of the base well 10 A base well (10) centered around the intersection of the frame made of the grooved steel (13), the FRP layer (14) overlaid on the outside of the frame, and the horizontal grooved steel (12) and the vertical grooved steel (13) of the frame. To the FRP housing (11) consisting of a bolt housing (15) installed to protrude in the direction of (2) and an adjustment bolt (16) coupled to the bolt housing (15) to support the FRP frame (11) in the base well (10). Is done.

Repair method by the structure consisting of the FRP frame 11 as described above is the flow chart of FIG.

After installing the structure consisting of the FRP frame 11 around the foundation well 10 to be repaired, remove the water between the foundation well 10 and the FRP frame 11 and cast concrete to the foundation well 10 In repairing the outside of the first, excavation and cleaning the bottom of the foundation well 10 to be repaired on the ship (S10),

When the rock is exposed around the foundation well 10 at the step S10, the rock is excavated using the underwater rock drilling equipment to lower the FRP frame 11 to a predetermined depth (S20).

And attaching the horizontal groove section steel (12), vertical groove section steel (13) horizontally and vertically to produce an FRP frame (11) (S30), maintaining or supporting the gap between the FRP frame 11 and the base well (10) The bolt housing 15 is installed at regular intervals at a horizontal vertical intersection point of the FRP mold 10 so as to play a role, and an adjustment bolt 16 is installed therein (S40).

After installation of the adjusting bolt 16 and bolt housing 15, the pieces of FRP frame 11 are hung on the chain block, flanged inward for vertical and horizontal connection, and the FRP layer 14 is overlaid outside the flange joint surface. Waterproofing and lowering the FRP mold 11 on the rock foundation excavated in the step (S50).

When the FRP mold 11 is lowered on the excavated rock foundation through the step S50, the lower portion is poured into the undivided concrete 18 (S60), and after the concrete is cured, the water inside the FRP mold 11 is removed and the upper portion is Adjusts the adjustment bolt 16 installed in the bolt housing 15 installed at the intersection of the horizontal groove member steel 12 and the vertical groove member steel 13 of the FRP mold 11 to the end of the adjustment bolt 16. While maintaining the predetermined interval between the FRP mold 11 and the foundation well 10 by the contact with (10) to act as a brace by the adjustment bolt (16) (S70).

When the installation of the brace by the adjustment bolt 16 is completed, the surface of the foundation well 10 is removed by a dry method to remove the corroded surface, and after the surface of the foundation well 10 is ground, the reinforcing bars for the foundation well reinforcement are ground. Assembling in the fixed down the reinforcing bar assembly network 17 between the adjustment bolt 16 and the bolt housing 15 for the FRP frame props and pours the concrete dry (S80).

In the case of applying the repair structure of the present invention to dry repair, as shown in FIG. 8, first, a temporary barrier 19 is installed along the periphery of the base well 10 (FIG. 8A), and the base well 10 is corroded. After the process of selecting and removing the corroded portion 20 (Fig. 8b), the concrete 21 is poured into the ground around the bottom of the base well (10) and evenly (Fig. 8c), the base of the well 10 In the foundation well repairing method of installing a concrete curing mold on the outside to form a new deposition film on the outside of the foundation well 10, the installation of the temporary film 19 and the chipping process of the corresponding portion of the foundation well 10 After finishing and compacting the concrete around the foundation well 10, and installed along the outer periphery of the foundation well 10, the FRP frame 11 defined by the flange joint (Fig. 8d), the FRP frame ( 11) pour concrete into the interspace (Fig. 8e) and remove the temporary barrier 19 (Fig. 8f) to the foundation well; Repair the foundation well by forming a new deposition film consisting of the FRP frame 11 outside the cylinder (10).

The FRP mold 11 may be divided into one to four or more pieces according to the diameter or shape of the foundation well 3 and stacked along the height of the foundation well 10.

When the repair structure of the present invention is applied to the water repair, the FRP frame 11 is installed around the base well 10 as shown in FIG. 9 and is located between the base well 10 and the FRP frame 11. In the submersible foundation well repair method, which removes water and installs a concrete curing mold outside the foundation well to form a new deposition film outside the foundation well, the submersible 22 has the foundation well 10 underwater. Checking the corrosion site 20 of the step and pouring the stone and underwater concrete around the base well (10) to form a foundation 23 (Fig. 9a),

Forming the base plate 23 and flange-joined FRP frame 11 prepared in advance on the work platform 24 in a vertical / horizontal step to lower the base well 10 in the water (Fig. 9b),

When the FRP frame 11 is lowered along the foundation well 10 and positioned on the foundation 23, the underwater concrete 25 of about 1 lottery is poured along the foundation well 10, and the underwater concrete ( 25) after the step of excluding the water between the FRP mold 11 and the base well (10) (Fig. 9c),

Step through which the worker enters through the space between the foundation well 10 and the FRP mold 11 to remove and select the corroded concrete (FIG. 9D),

After selecting and removing the corrosion part 20 of the foundation well 10, the worker returns to the shipboard 24 again to pour concrete and cure concrete between the foundation well 10 and the FRP mold 11. Repair the basin well in step (FIG. 9E).

In the repair of the foundation well, when the structure of the present invention is applied to the underwater repair method, the height of the foundation well is high and wide so that the crane work or the installation of the onboard work platform can be carried out, and the depth of the condition or the foundation well can be carried by the barge. Limited application is possible to bridges that are not buried in this bed. And if the overload load is expected due to the medium repair of the foundation well, it is repaired using the structural lightweight aggregate, and it is applied when the underwater work is possible because the river is not polluted.

The FRP mold 11 according to the present invention maintains the shape while reinforcing the horizontal groove member steel 12 and the horizontal groove member steel 12 determined according to the shape and circumference of the base well 10 as shown in FIGS. 5 and 6. A frame consisting of a vertical grooved steel 13, an FRP layer 14 formed on the outside of the frame, and an intersection of the horizontal grooved steel 12 and the vertical grooved steel 13 of the frame. FRP frame 11 consisting of a bolt housing 15 protruding in the direction of 10) and an adjustment bolt 16 coupled to the bolt housing 15 to support the FRP frame 11 in the base well 10. By applying this, the form of this FRP mold 11 is particularly advantageous for dry repair in the underwater repair method.

That is, the entire FRP frame 11 without the sheet pile is simply fixed to the outer wall of the foundation well 10 by adjusting the length of the adjustment bolt 16 installed near the intersection of the vertical grooved steel 13 and the horizontal grooved steel 12. As it can be supported, it is possible to proceed with the maintenance of the foundation well immediately without the need for other work such as installing a seat pile.

In addition, in the case of using the FRP mold 11 of the present invention without the distinction between dry / underwater repair method, the FRP mold 11 can form a frame of a round or oval according to the construction conditions of the foundation well 10 to be repaired. In addition, the upper and lower or middle circular frame can be formed as a multi-stage circular to elliptical frame only by the horizontal flange joint, so that the construction work can be completed by pouring underwater concrete without shape restriction.

The outer wall of the frame consisting of the vertical grooved steel 13 and the horizontal grooved steel 12 forms the FRP layer 14, which is a reinforced plastic. The FRP is a composite material of unsaturated polyester resin and glass fiber, which is stronger than iron and higher than aluminum. It is a reinforced plastic that is excellent in light acid resistance, heat resistance and corrosion resistance and is almost permanent. 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.

In addition, the FRP material is simply attached to the foundation well to repair the foundation well or form a separate frame, so that the FRP frame can be easily fixed and supported on the foundation well as in the present invention, rather than the known conventional method of placing concrete therein. It is more advantageous to apply the well repair method, and there is no need to construct the sheet pile or concrete curing structure on site to support and fix the FRP mold to the foundation well according to the structure characteristics. Repairing the foundation wells by the framework can eliminate various defects such as concrete corrosion, flood scour caused by rust, and rust generation.It also eliminates the inconvenience of applying the FRP framework. It can be advantageous for economy and shortening of air.

According to the present invention, in repairing the outer wall of the foundation well with the FRP structure, it is possible to repair the foundation well by manipulating only the adjustment bolt in the FRP mold itself, without performing complicated accessory work such as the field construction of the seat pile. It is possible to reduce the construction process along with the air shortening to improve the constructability and the economic and reliability.

Claims (1)

An inner frame that contacts the outer wall of the foundation well, an outer frame spaced apart from the inner frame, a concrete placing space made by the gap between the inner frame and the outer frame, and an angle structure FRP frame placed in the casting space is stacked around the base well. In the structure to repair the bucket, The base well repair structure, A frame made of a horizontal grooved steel 12 determined according to the shape and circumference of the base well 10 and a vertical grooved steel 13 for maintaining the shape while reinforcing the horizontal grooved steel 12; An FRP layer 14 overlaid on the outside of the frame, A bolt housing 15 protruding in the direction of the base well 10 at the intersection of the horizontal grooved steel 12 and the vertical grooved steel 13 of the frame; The structure for repairing the foundation well, characterized in that the adjustment bolt (11) is coupled to the bolt housing (15) to support the FRP frame (11) in the foundation well (10).