KR102618251B1 - Bridge Deck Replacement Construction Method - Google Patents

Abstract

The present invention can increase the structural safety of joints between floor plates, improve resistance to sliding shear of floor plates and girders, prevent damage such as cracks in poured concrete, and improve constructability, making it easier and easier to construct. This is about a construction method for replacing the deck plate of a bridge that can be constructed quickly.
The bridge deck replacement construction method according to the present invention to solve the above problems includes the steps of dismantling the deck plate; Remaining concrete removal step; Shear connector installation step; Steps to reinstall the floorboards; Floor plate joint connection step; Concrete pouring and curing stages; Waterproofing construction stage; and a packaging construction step, wherein the shear connector in the shear connector installation step is made of a section steel having a predetermined length in the vertical direction, and the shear connector is installed vertically on the upper part of the girder portion and then fixed through welding. It is characterized by being

Description

Bridge Deck Replacement Construction Method}

The present invention relates to a method of replacing the deck of a bridge, and more specifically, to a method of removing (demolition) the deck of an old bridge and then replacing it with a newly prepared deck.

In general, after removing the old deck of a bridge, a new precast concrete deck is manufactured and mounted on the existing girder, and then the old deck of the bridge is replaced by integrating the girder and the new deck.

As a prior art for the bridge deck replacement construction method as described above, the bridge deck replacement method and the prestressed concrete girder assembly used therein (hereinafter referred to as 'patent document') disclosed in Patent Publication No. 2016-0115602. there is.

The patent document describes a method of replacing the existing floor plate of a bridge having an existing floor plate on the upper side of the first and second support girders arranged on the bridge piers in the bridge axis direction, by replacing the existing floor plate with the first support girder. and a step of removing the existing floor plate from the second support girder; A connection concrete forming step of forming connection concrete by filling the empty space between the first support girder and the second support girder with cast-in-place concrete; A second tension member installation step of installing a second tension member connecting the first support girder and the second support girder to the upper edge of the neutral axis of the first support girder and the second support girder; A first prestress introduction step of introducing compressive prestress to the upper edge of the neutral axis of the first and second support girders on the upper side of the pier by tensioning at least some of the second tension members; And it includes a new floor plate installation step of installing a new floor plate on the upper side of the first support girder and the second support girder after the first prestress introduction step.

However, in the above patent document, "U"-shaped loop-shaped connecting reinforcing bars protrude from both sides of the floor plate, and a plurality of transverse reinforcing bars are installed with these loop-shaped connecting reinforcing bars intersecting each other at the joint. In this case, the concrete poured in the connection is subjected to a shear force that is pulled in both directions from the inside due to the loop-type connecting rebar, and due to this structure, the problem of frequent damage such as cracks and splitting of the concrete poured in the connection occurs. there is.

Therefore, there is a need to develop a bridge deck replacement construction method that can increase the structural safety of joints between floor plates, prevent damage such as cracks in poured concrete, and improve constructability so that construction can be done easily and quickly.

KR 10-2016-0115602 A (2016. 10. 06.) KR 10-1270947 B1 (2016. 10. 06.) KR 10-0989153 B1 (2010. 10. 14.) KR 10-0758878 B1 (2007. 09. 10.)

The present invention was developed to solve the problems of the conventional bridge deck replacement construction method as described above. The problem to be solved by the present invention is to increase the structural safety of the joint between the deck plates, and to improve the structural safety of the joint between the deck plates and the deck plate. The goal is to provide a bridge deck replacement construction method that can improve the resistance to sliding shear of a girder, prevent damage such as cracks in poured concrete, and improve constructability so that construction can be done easily and quickly.

The bridge deck replacement construction method according to the present invention to solve the above problems includes a deck dismantling step of dismantling and removing an old deck already installed on the bridge; After the floor plate disassembly step, a remaining concrete removal step of removing the concrete remaining on the upper part of the girder portion and the existing shear connector; After the remaining concrete removal step, a shear connector installation step of installing a shear connector on the exposed girder portion; After the step of installing the shear connector, a floor plate reinstallation step of installing a floor plate with a shear pocket pre-formed on the shear connector; After the floor plate reinstallation step, a floor plate joint connecting step of constructing reinforcing bars at the joint between the floor plates and connecting them; A concrete pouring and curing step of pouring concrete into the shear pocket and the joint and curing it for a predetermined period after the step of connecting the floor plate joint; After the joint concrete pouring and curing steps, a waterproofing construction step of forming a waterproofing layer by applying a waterproofing agent to the upper surface of the floor plate; And after the waterproofing construction step, it consists of a paving construction step of laying asphalt concrete to a predetermined thickness on the waterproofing layer to form a surface layer, and the shear connector in the shear connector installation step is made of a section steel having a predetermined length in the vertical direction, , the shear connector is installed vertically on the upper part of the girder and then fixed through welding.

In the step of connecting the floor plate joint of the present invention, a plurality of connecting reinforcing bars extending a predetermined length and spaced apart at predetermined intervals in the vertical and horizontal directions on both sides of the floor plate are arranged alternately on the joint and overlap by a predetermined width, Another feature is that a plurality of transverse reinforcing bars are installed to cross the connecting reinforcing bars arranged in a staggered manner.

In addition, the present invention has another feature in that a nut having a thread corresponding to the thread of the reinforcing bar is installed on the connecting reinforcing bar, so that a horizontal fixing force is applied between the concrete and the reinforcing bar through the nut after the concrete is placed.

In addition, in the present invention, a screw hole of a predetermined diameter is formed in the nut to penetrate one side, a bolt of a predetermined diameter is assembled into the screw hole, and the bolt is secured so that the nut does not move in position when installed on the reinforcing bar. Another feature is that the nut is fixed through.

And the present invention is an H-beam with an H-shaped cross-section in which a plurality of through holes having a predetermined diameter are formed at the bottom of the shear connector; And a plurality of anchor bolts installed to protrude outward by a predetermined length through the through hole so that the bolt head is located inside the H beam, and the shear connector is a reinforcing bar where the anchor bolt is exposed to the upper part of the girder part. Another feature is that it is welded to the upper surface of the girder part.

According to the present invention, the old floor plate is welded and fixed to the upper part of the girder portion from which a shear connector made of section steel has been removed, and then the floor plate with the shear pocket formed is seated in accordance with the position of the shear connector installed on the girder portion, and then the connecting reinforcing bars at both ends. After adjacent floor plates are connected, concrete is poured into the shear pockets and joints and cured. This has the advantage of allowing an old floor plate to be easily and quickly replaced, while a new floor plate can be firmly installed on the existing girder. .

In addition, since the connecting reinforcing bars that connect the joints between floor plates are formed in a straight shape, it is easy to insert and install transverse reinforcing bars, and since the concrete is poured and cured with nuts installed and fixed on the connecting reinforcing bars, even if the connecting reinforcing bars are formed in a straight shape. It has the advantage of being able to exert sufficient fixing force in the horizontal direction.

1 is a process flow chart showing an example of a bridge deck replacement construction method according to the present invention.
Figure 2(a, b) is a view showing an example of the dismantling step of the floor plate and the residual concrete removal step of a concrete bridge according to the present invention.
Figure 3(a, b) is a diagram showing an example of the dismantling step and concrete removal step of the deck of a steel bridge according to the present invention.
Figures 4 and 5 are diagrams showing examples of the shear connector installation steps according to the present invention.
Figure 6a is a view showing an example of the floor plate reinstallation step according to the present invention being applied to a concrete bridge.
Figure 6b is a view showing an example in which the floor plate reinstallation step according to the present invention is applied to a plate girder bridge.
Figure 6c is a diagram showing an example in which the floor plate reinstallation step according to the present invention is applied to a steel box bridge.
Figure 7 is a view showing an example of a joint formed between a floor plate and a floor plate according to the present invention.
Figure 8 is a view showing an example of a nut being installed on a connecting rebar according to the present invention.
Figures 9 and 10 show examples of floor plate joint connection steps according to the present invention.

Hereinafter, the present invention will be described in detail according to the accompanying drawings showing preferred embodiments.

The present invention can increase the structural safety of the joint between floor plates, improve the resistance to sliding shear force of floor plates and girders, prevent damage such as cracks in poured concrete, and improve constructability. The purpose of the present invention is to provide a construction method for replacing the deck of a bridge that can be constructed easily and quickly. For this purpose, the present invention includes the steps of dismantling the deck (S10), removing remaining concrete (S20), and installing shear connectors, as shown in FIG. 1. (S30), floor plate reinstallation step (S40), floor plate joint connection step (S50), joint concrete pouring and curing step (S60), waterproofing construction step (S70), and paving construction step (S80).

(1) Floor plate disassembly step (S10)

In this step, the floor plate (1) installed on the old bridge is dismantled and removed from the girder portion (10).

In this floor plate disassembly step (S10), as shown in FIGS. 2(a) and 3(a), the old floor plate 1 is cut to a predetermined length using a wire saw, etc., and at the same time, the girder portion 10 ) and the floor plate (1) are cut so that the floor plate (1) can be separated from the girder part (10), and then the floor plate (1) is lifted using a crane, etc. and is removed (dismantled) from the girder part 10.

(2) Remaining concrete removal step (S20)

In this step, after the aged floor plate (1) is removed through the floor plate dismantling step (S10), the remaining concrete on the exposed upper part of the girder portion (10) is removed (dismantled).

In this residual concrete removal step (S20), as shown in FIGS. 2(b) and 3(b), the remaining concrete (1A) of the girder portion 10 and the existing shear connector are removed using a power tool such as a breaker. In this process, in the case of a concrete bridge, the reinforcing bar 11 is exposed to a predetermined length at the top of the girder part 10.

(3) Shear connector installation step (S30)

In this step, after the remaining concrete (1A) is removed through the remaining concrete removal step (S20), in the case of a concrete bridge, the shear insulation material (20) is installed on the reinforcing bar (11) exposed at the top of the girder part (10). And, in the case of a steel bridge, the shear connector 20 is installed on the upper part of the girder part 10.

The shear connector 20 in this shear connector installation step (S30) may be composed of a section steel having a predetermined length in the vertical direction, and this shear connector 20 is a reinforcing bar 11 exposed to the upper part of the girder portion 10 of the concrete bridge. ), or installed on the upper surface of the girder part 10 of a steel bridge, and then firmly fixed to the reinforcing bar 11 or the upper surface of the girder part 10 through welding.

At this time, the shear connector 20 includes an H-beam 21 having an H-shaped cross-sectional shape in which a plurality of through holes (no reference numerals) having a predetermined diameter are formed at the bottom, as shown in FIG. 4, and the H-beam 21 It may be composed of a plurality of anchor bolts 22 installed to protrude a predetermined length outward through the through hole so that the bolt head is located inside.

This shear connector 20 is made by installing the anchor bolt 22 in the through hole of the H beam 21, and then attaching the reinforcing bar 11 or the girder part ( By welding the contact portion of the anchor bolt 22 to the upper surface of 10), the H beam 21 is firmly fixed so as not to flow.

In addition, the shear connector 20 may be installed in multiple rows at predetermined intervals along the length of the girder portion 10, and through this, the horizontal direction generated between the reinstalled floor plate 30 and the girder portion 10 Shear forces are reliably prevented from occurring.

In order to reduce the horizontal shear force occurring between the girder part 20 and the floor plate 30 through the above configuration, construction is relatively simple compared to reinstalling a plurality of studs on the upper surface of the girder part 10 through welding. Since the time can be reduced and a relatively larger contact area can be secured compared to the stud, the horizontal shear force occurring between the girder portion 10 and the floor plate 30 is reliably suppressed.

At this time, a plurality of holes (not shown) may be formed in the shear connector 20 at predetermined intervals, and when concrete is poured through these holes, concrete passes toward the hole, thereby strengthening the bond between the concrete and the shear connector 20 after curing. will be further improved.

(4) Floor plate reinstallation step (S40)

In this step, after the shear connector 20 is installed through the shear connector installation step (S30), the floor plate 30 of a predetermined size pre-manufactured in the factory is seated on the girder portion 10 using a crane, etc. By reinstalling, the floor plates 30 are arranged at a predetermined distance from each other so that a joint space (A) is formed at a predetermined interval between the other adjacent floor plates 30.

The floor plate 30 in this floor plate reinstallation step (S40) is manufactured with a shear pocket (P) of a predetermined size in which the shear connector 20 is accommodated as shown in FIG. 6A, and this shear pocket (P ) and the shear connector (20) are aligned and seated, then concrete is poured into the shear pocket (P) and joined together.

At this time, on both sides of the bottom plate 30, a plurality of rows of connecting reinforcing bars 31 having a predetermined length in the horizontal direction are formed to protrude in multiple rows. These connecting reinforcing bars 31 are arranged on both sides to be offset from each other, as shown in Figure 7. The connecting reinforcing bars 31 of the adjacent floor plates 30 are naturally arranged in a staggered state.

In addition, a nut 33 having a thread corresponding to the thread of the reinforcing bar may be installed at the tip of the connecting reinforcing bar 31, and the load acting in the horizontal direction on the floor plate 30 can be provided through this nut 33. It may be configured to act as a fixing force (adhesion force).

At this time, the nut 33 has a screw hole 33A of a predetermined diameter formed to penetrate one side as shown in FIG. 8, and a bolt 34 of a predetermined diameter is assembled into the screw hole 33A, forming the nut ( The nut 33 may be configured to be fixed through the bolt 34 so that it does not move while the 33) is installed on the rebar.

Through the above configuration, the nut 33 is installed on the connecting reinforcing bar 31 and fixed in position through the bolt 34, so it is prevented from moving arbitrarily before pouring concrete, and after pouring concrete, the nut 33 and the connecting reinforcing bar 31 ) is cured while the concrete flows into the gap between the concrete, so that sufficient fixing force can be exerted to resist the horizontal load acting on the floor plate (30).

Above, it was shown and explained that only the nut 33 is installed at the tip of the connecting reinforcing bar 31, but unlike this, a plurality of nuts 33 are installed at predetermined intervals along the length of the connecting reinforcing bar 31. It is okay to implement it.

In addition, above, it is shown and explained that the floor plate 30 is only constructed on the girder portion 10 of the concrete bridge, but unlike this, the shear connector 20 is installed on the plate girder portion 10' as shown in Figure 6b. Next, the bottom plate 30 on which the shear pocket P is formed can be installed and constructed in the same manner as above, or alternatively, the shear connector 20 is placed on the steel box girder portion 10" as shown in FIG. 6C. After installation, the bottom plate 30 on which the shear pocket (P) is formed can be changed and carried out to be installed.

In this case, the shear connector 20 may be composed only of an H-beam 21 with an H-shaped cross-section in which the anchor bolt 22 is omitted, and through this, the bottom surface of the H-beam 21 and the girder portions 10', 10 ") are welded by directly contacting each other.

(5) Floor plate joint connection step (S50)

In this step, after the floor plate 30 is reinstalled on the girder part 10 through the upper floor plate reinstallation step (S40), a horizontal joint (A) between the floor plates 30 is formed as shown in FIG. 9. It is connected by installing rebar in one direction.

In this floor plate joint connection step (S50), as shown in Figure 9 (a, b), a plurality of transverse reinforcing bars 32 are pre-installed and seated on the connecting reinforcing bars 31, thereby forming the floor plate 30. It is seated, and through this, the transverse reinforcing bars 32 having a predetermined length can be easily positioned and installed in the transverse direction without the hassle of inserting them between the connecting reinforcing bars 31.

(6) Concrete pouring and curing stage (S60)

In this step, after the floor plate joint connection step (S50) above is completed, concrete is poured into the shear pocket (P) and joint portion (A) formed in the floor plate 30 and cured for a predetermined period of time, thereby forming the girder section. (10) and the bottom plate 30 and the bottom plate 30 and the bottom plate 30 are firmly connected to each other.

(7) Waterproofing construction stage (S70)

In this step, after the above concrete pouring and curing step (S60) is completed, a waterproofing agent is uniformly applied to the upper surface of the floor plate 30, thereby forming a waterproofing layer of a predetermined thickness.

(8) Packaging construction stage (S80)

In this step, after the above waterproofing construction step (70) is completed, asphalt concrete is laid to a predetermined thickness on the waterproofing layer to form a surface layer (50). Once the surface layer (50) is formed in this way, the floor plate replacement construction is completed. .

As described above, in the present invention, the old bottom plate is welded and fixed to the upper part of the girder portion from which the old bottom plate has been removed with a shear connector made of section steel, and then the bottom plate with the shear pocket formed is seated in accordance with the position of the shear connector installed on the girder portion, and then the bottom plate at both ends is Adjacent floor plates are connected using connecting reinforcing bars, and then concrete is poured into the shear pockets and joints and cured, allowing the old floor plate to be easily and quickly replaced, while the new floor plate can be firmly installed on the existing girder. .

In addition, since the connecting reinforcing bars that connect the joints between floor plates are formed in a straight shape, it is easy to insert and install transverse reinforcing bars, and since the concrete is poured and cured with nuts installed and fixed on the connecting reinforcing bars, even if the connecting reinforcing bars are formed in a straight shape. Sufficient fixing force is exerted in the horizontal direction.

Above, for convenience of explanation, reference numerals and names have been given to the drawings showing preferred embodiments and the configurations shown in the drawings. However, this is an embodiment according to the present invention, and the shapes shown in the drawings and the names given are The scope of the rights should not be construed as limited, and changes to various shapes that can be predicted from the description of the invention and simple substitution to a configuration that performs the same function are within the scope of changes that can be easily carried out by a person skilled in the art. You will see this as extremely self-evident.

1: Floor plate 1A: Remaining concrete
10, 10', 10": girder 11: rebar
20: Shear connector 21: H beam
22: anchor bolt 30: bottom plate
31: Connecting reinforcing bar 32: Transverse reinforcing bar
33: Nut 33A: Screw hole
34: Bolt A: Joint
P: Front pocket

Claims (5)

In the method of replacing the old deck of a bridge,
A floor plate dismantling step (S10) of dismantling and removing the old floor plate (1) already installed on the bridge;
After the floor plate disassembly step (S10), a remaining concrete removal step (S20) of removing the concrete remaining on the upper part of the girder portion 10 and the existing shear connector;
After the remaining concrete removal step (S20), a shear connector installation step (S30) of installing the shear connector 20 on the exposed girder portion 10;
After the shear connector installation step (S30), a floor plate reinstallation step (S40) of seating and installing the floor plate (30) on which the shear pocket (P) is pre-formed on the shear connector (20);
After the floor plate reinstallation step (S40), a floor plate joint connection step (S50) of connecting reinforcing bars to the joint portion (A) between the floor plates (30);
After the floor plate joint connection step (S50), a concrete pouring and curing step (S60) of pouring concrete into the shear pocket (P) and the joint portion (A) and curing it for a predetermined period of time;
After the joint concrete pouring and curing step (S60), a waterproofing construction step (S70) of forming a waterproof layer (40) by applying a waterproofing agent to the upper surface of the floor plate (30); and
After the waterproofing construction step (S70), a paving construction step (S80) of forming a surface layer by laying asphalt concrete to a predetermined thickness on the waterproofing layer;
It consists of
The shear connector 20 in the shear connector installation step (S30),
It is made of a section steel having a predetermined length in the vertical direction,
The shear connector 20 is,
It is installed vertically on the upper part of the girder part 10 and then fixed through welding,
In the floor plate joint connection step (S50),
A plurality of connecting reinforcing bars 31 extending a predetermined length and spaced apart at predetermined intervals in the vertical and horizontal directions on both sides of the floor plate 30 are arranged alternately on the joint A to overlap each other by a predetermined width,
A plurality of transverse reinforcing bars (32) are installed to cross the connecting reinforcing bars (31) arranged in a staggered manner,
In the connecting reinforcing bar (31),
A plurality of nuts 33 having threads corresponding to the threads of the reinforcing bars are installed at predetermined intervals, so that a horizontal fixing force is applied between the concrete and the reinforcing bars through the nuts 33 after the concrete is placed,
In the nut 33,
A screw hole (33A) of a predetermined diameter is formed to penetrate one side,
In the screw hole (33A),
A bridge deck replacement construction method, characterized in that bolts (34) of a predetermined diameter are assembled and fixed so that the nut (33) does not move in the state where it is installed on the reinforcing bar.
delete delete delete In claim 1,
The shear connector 20 is,
An H-beam 21 having an H-shaped cross-section with a plurality of through holes having a predetermined diameter formed at the bottom; and
A plurality of anchor bolts 22 installed to protrude outward by a predetermined length through the through hole so that the bolt head is located inside the H beam 21;
Including,
The shear connector 20 is,
A bridge deck replacement construction method, characterized in that the anchor bolts (22) are welded to the upper surface of the reinforcing bar (11) or the girder part (10) exposed at the top of the girder part (10).

Images