KR102658930B1 - Cantilever bracket and gfrp deck construction method using the same - Google Patents

Abstract

A precast deck made by combining beam members made of GFRP (Glass Fiber Reinforced Polymer) and concrete is removably installed on a bridge using a cantilever bracket, and a GFRP deck equipped with the same. A construction method is disclosed, wherein the cantilever bracket includes a reusable disassembly portion that is removably connected to a permanent installation portion embedded in a floor plate, and the reusable disassembly portion pin-connected to the bracket of the permanent installation portion serves as a hinge connection means. When the pin is removed, the reusable disassembly part from the permanent installation part can be dismantled by rotating downward without interference in the lower space of the constructed floor plate.

Description

Cantilever bracket and GFRP deck construction method equipped with it {CANTILEVER BRACKET AND GFRP DECK CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a GFRP deck construction method. More specifically, a cantilever bracket and a precast deck made by combining beam members made of GFRP (Glass Fiber Reinforced Polymer) and concrete are removably installed on a bridge using a cantilever bracket. This is about the GFRP deck construction method.

Figure 1a is an exemplary diagram of a conventional FRP deck.

In the case of FIG. 1a, the FRP deck is a concrete body 11 manufactured by precast method, and reinforcement bars 12 in the form of a truss protruding upward from the inside of the concrete body 11 are reinforcing bars for synthesis with floor slab concrete. However, it can be seen that the reinforcing bar 12 is made of FRP rather than reinforcing bar.

In this way, if the reinforcing bar 12 is made of FRP rather than reinforcing bar, the weight of the deck can be reduced compared to the same load resistance performance compared to the case of using reinforcing bar, high tensile strength can be secured, and corrosion resistance can be expected. This has the advantage of extending the overall lifespan of the precast deck and ensuring durability.

Figure 1b is an exemplary diagram of a conventional reinforced concrete deck.

That is, it can be seen that both lower ends of the U-shaped reinforcement (13) are connected to the horizontal internal reinforcing bars (14) of the concrete body (11), and the upper end of the U-shaped reinforcement (13) is exposed to the upper surface of the concrete body (11). The U-shaped reinforcement 13 uses reinforcing bars.

In other words, since the deck used for the purpose of the bridge deck is manufactured using the precast method, brought in and installed on site, and constructed as a whole by pouring the deck concrete, the concrete body 11 and the deck concrete are synthesized. It can be seen that in order to ensure performance, reinforcing bars made of steel bars or FRP can be used in shapes such as trusses and U-shapes.

At this time, it can be seen that the reinforcing bars made of the steel bars or FRP are mainly manufactured using wire rods to reduce weight, and GFRP is mainly used as a structural member recently.

In addition, it can be seen that reinforcing bars made of rebar or FRP are usually manufactured in the form of a bar, but are manufactured in a form such as a truss by assembling or combining bar-shaped GFRP.

1C, 1D, and 1E are exemplary diagrams of a cantilever bracket 20 used in a conventional bridge.

The cantilever bracket 20 operates in the form of a cantilever beam because the deck installed on the side of the bridge girder 30 is installed by fixing only one side to the upper surface or ventral side of the bridge girder.

Accordingly, the cantilever bracket (20) is first installed on the left and right sides of the bridge girder, and the deck is installed on the side of the bridge girder (30) by installing the deck so that it is supported on the upper surface of the installed cantilever bracket (20). It is also installed between girders so that both ends of the deck are supported.

In addition, recently, a method of installing the cantilever bracket on a bridge girder in a detachable manner and then dismantling and reusing the cantilever bracket has been widely used, and this is usually referred to as a detachable cantilever bracket.

Accordingly, according to the conventional cantilever bracket 20 shown in Figure 1c, the support frame 21 is inserted and installed on the side of the upper flange of the PSC girder using the shear connector 31 on the upper surface of the upper flange without separate anchoring work,

The connection plate 22 connected to the fixing plate 23 is fixed to the support frame 21 using a horizontal fastening bolt (2), and a steel beam 24 is attached to the bottom of the fixing plate 23 using a fastener. You can see that it is connected,

It can be seen that a precast deck (not shown) is installed to be supported on the upper surface of the steel beam 24. Accordingly, in the case of Figure 1c, it can be seen that disassembly is possible when the fixing plate 23 is separated from the connection plate 22.

Next, the conventional cantilever bracket shown in FIG. 1D introduces a method of installing the cantilever bracket 20 on the upper side of the box-shaped steel girder 40.

That is, the ring 41 is fixed to the side of the box-shaped steel girder by a method such as welding,

It can be seen that the end of the steel beam 42 is installed to penetrate the ring 41 using a connecting shaft 43 and an acupressure plate 44,

If necessary, it can be seen that the cantilever bracket can be dismantled by dismantling the connecting shaft 43 and the acupressure plate 44.

As a result, it can be seen that cantilever brackets can be installed permanently or removably in consideration of workability and constructability depending on whether the bridge girder is a steel box or PSC girder. In particular, steel beams are used to directly support the precast deck. You can see that there is.

This steel beam 42 is used as a ready-made product or is used with a tapered cross section whose height decreases in the direction of extension. Due to its structure being installed in the form of a cantilever beam, the part connected to the bridge girder is the height of the steel beam. You can see that it is also getting bigger.

Next, the conventional cantilever bracket shown in FIG. 1e introduces a method of installing the cantilever bracket using both the top and side surfaces of a box-type steel girder.

That is, the cantilever bracket 20 shown in FIG. 1E has a plurality of shear connectors 41 formed on the upper surface of the box-shaped steel girder 40, and the abdomen is inclined, so shearing occurs in the through holes 28 and 29. The connection plate (25) is fixedly installed by inserting the connection material (41),

A steel beam (26) is integrated into the bottom of the connection plate (25) protruding to the side of the box-shaped steel girder (40), and is supported using a horizontal support module (27) on the fixed end of the steel beam and the inclined abdomen. can be seen.

That is, the box-shaped steel girder 40, which has a shear connector 41 formed on the upper surface and is formed to have an inclined abdomen, interferes with the installation of the cantilever bracket, so a cantilever bracket is manufactured with a structure to overcome this,

In particular, since the horizontal support module 27 is a fastener type, it can be seen that it can be attached and detached. It can be seen that the use of the steel beam (26) is the same as the cantilever bracket discussed earlier.

Republic of Korea Patent No. 10-2155646 (Title of invention: ＦＰ＼ＰＰＣＰＣ deck, formwork therefor, and manufacturing method of ＦＲＰＰＰＣＰＣ deck using the same, publication date: September 14, 2020) Republic of Korea Patent Publication No. 10-2022-0077373 (Title of invention: Deck plate for pouring bridge floor, Publication date: June 9, 2022) Republic of Korea Patent Publication No. 10-2019-0014813 (Title of invention: Cantilever construction method for girder bridge, Publication date: February 13, 2019) Republic of Korea Patent No. 10-2307943 (Title of invention: Detachable support bracket for cantilever bridge and construction method of cantilever bridge using the same, Publication date: September 30, 2021)

Accordingly, the present invention installs a cantilever bracket, and after installing a precast deck, the cantilever bracket can be dismantled and reused, and the extension length can also be adjusted, so that various precast decks can be installed, creating a more economical bridge floor. The technical problem to be solved is to provide a cantilever bracket capable of plate construction and a GFRP deck construction method equipped with it.

In addition, in the present invention, when manufacturing a precast deck, the reinforcement bar made of GFRP material in the form of a beam member is used, but the lower end is located below the neutral axis of the cross section of the deck body, so that it can more effectively resist tensile force and is maintained without the risk of corrosion. The technical task to be solved is to provide a cantilever bracket that is effective in management and a GFRP deck construction method equipped with it.

In addition, the present invention allows the bridge girder to be freely installed and dismantled on the top, side, and abdomen of the steel girder or PSC girder, and can also adjust the gradient when installing the GFRP deck, so the cantilever bracket and GFRP deck equipped with the same have expanded usability. The technical problem to be solved is the provision of construction methods.

The cantilever bracket of the present invention for achieving the above problem is a cantilever bracket including a reusable disassembly part that is removably connected to a permanent installation part embedded in the floor plate, and the reuse disassembly part pin-connected to the bracket of the permanent installation part, When the pin as a hinge connection means is removed, the reusable disassembly part is dismantled from the permanent installation part by rotating downward in the lower space of the constructed floor plate without interference, and the cantilever bracket is fastened up and down by the reusable disassembly part and the fixing bolt. Double inclined brackets are formed on the bottom of the upper plate so that the bottom of both inclined brackets can be formed in the center of the lower plate, and a support extension that is formed by moving the gradient adjustment unit to the upper surface on both sides of the lower plate is included.

The method of constructing a GFRP deck equipped with a cantilever bracket of the present invention to achieve the above problem is (a) installing a PSC girder as a bridge girder, installing the central GFRP deck (D) between the PSC girders, and installing the PSC girder. Installing a cantilever bracket on the side using an anchor as a fixing means; and (b) a central GFRP deck (D) installed on the upper surfaces of the PSC girder and a cantilever bracket that extends longitudinally on the side of the bridge girder and is supported by a cantilever bracket, which is a precast deck installed as a half-precast. It includes the step of pouring and curing the floor plate concrete (C) on the upper part of the GFRP deck to complete the floor plate, and separating the reusable disassembly part installed to be detachable from the permanent installation part, wherein the cantilever bracket in step (a) includes, Double inclined brackets are formed on the bottom of the upper plate so that the top and bottom can be fastened by the reusable disassembly part and fixing bolts. The bottom of the double inclined brackets is formed in the center of the lower plate, and the slope adjustment unit is moved to the upper surface on both sides of the lower plate. It is intended to include a support extension as much as possible.

The method of constructing a GFRP deck equipped with a cantilever bracket of the present invention to achieve the above problem is (a) installing a steel box girder as a bridge girder, installing the central GFRP deck (D) between the PSC girders, and steel Installing a cantilever bracket on the side of the box girder using an anchor as a fixing means; and (b) a central GFRP deck (D) installed on the upper surfaces of the PSC girder and a cantilever bracket that extends longitudinally on the side of the bridge girder and is supported by a cantilever bracket, which is a precast deck installed as a half-precast. It includes the step of pouring and curing the floor plate concrete (C) on the upper part of the GFRP deck to complete the floor plate, and separating the reusable disassembly part installed to be detachable from the permanent installation part, wherein the cantilever bracket in step (a) includes, Double inclined brackets are formed on the bottom of the upper plate so that the top and bottom can be fastened by the reusable disassembly part and fixing bolts. The bottom of the double inclined brackets is formed in the center of the lower plate, and the slope adjustment unit is moved to the upper surface on both sides of the lower plate. It is intended to include a support extension as much as possible.

The removable cantilever bracket according to the present invention can be installed, but the reusable dismantled part from permanent installation can be dismantled by rotating downward without interference in the lower space of the constructed floor plate, so quick and effective precast deck installation is possible, and it can be recycled. This makes it possible to provide a cantilever bracket that allows the use of a more economical detachable cantilever bracket and a GFRP deck construction method equipped with the same.

The detachable cantilever bracket according to the present invention can be used by simply connecting the remaining part and the dismantled part in a modular way, and the expanded part can be easily installed and dismantled by sliding, so unnecessary use of materials can be prevented, making it a more efficient detachable type. It becomes possible to provide a cantilever bracket that can be used and a GFRP deck construction method equipped with it.

The GFRP deck supported by the detachable cantilever bracket according to the present invention is easy to manufacture because it uses H-beams instead of wires as reinforcement and can be cut as needed to reduce weight and reduce corrosion by optimizing the precast concrete body. It is possible to solve the problem of durability deterioration caused by cantilever brackets that are effective in maintenance and a GFRP deck construction method equipped with them.

Figure 1a is an example of a conventional FRP deck,
Figure 1b is an example of a conventional reinforced concrete deck,
Figures 1c, 1d and 1e are examples of cantilever brackets used in conventional bridges;
Figure 2 is an exemplary bridge constructed using a GFRP deck equipped with a cantilever bracket of the present invention, Figures 3a, 3b, 3c and 3d are exemplary diagrams of a cantilever bracket of the present invention,
Figure 4 is an illustration of gradient adjustment of a GFRP deck equipped with a cantilever bracket of the present invention and an illustration of separation of the cantilever bracket;
Figures 5a, 5b and 5c are illustrations of a central GFRP deck and a GFRP deck equipped with a cantilever bracket according to the present invention;
Figures 6a, 6b, 7a and 7b show examples of a GFRP deck construction method equipped with a cantilever bracket of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

[Cantilever bracket (200) and GFRP deck (100) equipped with cantilever bracket of the present invention]

Figure 2 is an exemplary bridge constructed using the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention, and Figures 3a, 3b, 3c and 3d are examples of the cantilever bracket 200 of the present invention. It shows a diagram.

According to Figure 2, the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention is used as a precast deck installed in a half-precast manner on the side of the bridge girder 300 mounted so as to be spaced apart in the transverse direction. You can see that it is.

That is, the GFRP deck 100 equipped with cantilever brackets 200 is installed on the side of a plurality of bridge girders 300 mounted on the bridge substructure, and floor plate concrete (C, see FIGS. 6b and 7b) is installed. By pouring, the bridge deck is constructed.

At this time, the bridge girder 300 may be a PSC girder or a steel box girder, and it can be seen that a plurality of shear connectors 310 may be protrudingly installed on the upper surface of the bridge girder 300. At this time, the shear connector 310 only serves as a synthetic connector when pouring concrete on the upper floor plate.

In addition, it can be seen that a central GFRP deck (D) can be installed between the bridge girders (300), and this central GFRP deck (D) is compared to the GFRP deck (100) equipped with a cantilever bracket (200). A GFRP deck that is installed so that both ends are supported between bridge girders (300) without using a cantilever bracket (200), and is the same as the GFRP deck (100) equipped with a cantilever bracket (200) except for the installation direction. am.

Accordingly, a detailed look at the cantilever bracket 200 used in the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention is as follows.

First, the cantilever bracket 200 is divided into a basic cantilever bracket 200a and an extended cantilever bracket 200b. The extended cantilever bracket 200b has length and support extensions 230 and 240 installed on the basic cantilever bracket 200a. There is a difference in doing it.

Accordingly, referring to FIGS. 3A and 3B, the basic cantilever bracket 200a can be seen to be formed to include a permanent installation portion 210 and a reusable disassembly portion 220.

First, the permanent installation part 210 refers to a part that is permanently fixed and installed on the side of the bridge girder 300, as shown in FIGS. 3A and 3B. If the bridge girder 300 is a PSC girder, an anchor ( In the case of a steel box girder (see FIG. 6a), it is permanently installed on the bridge girder 300 by fixing means such as welding (see FIG. 7a), and the reusable disassembly part 220 is formed to be detachable.

For this purpose, according to FIGS. 3A and 3B, the permanent installation part 210 is a trapezoidal horizontal plate, and a through hole 211 is formed on one side of the bridge girder so that a fixing means such as an anchor can be installed through it. It can be seen that the rotation connection part 212 can be formed on the other side bottom surface so that it can be separated from the reuse and disassembly part 220.

This rotational connection part 212 is formed by a bracket 212a with a pinhole formed on the bottom of the other side of the permanent installation part 210 and is rotatably connected to a pin 221e installed in the reusable disassembly part 220, By removing the pin 221e, the reusable disassembly part 220 can be separated from the permanent installation part 210.

That is, referring to FIGS. 6b and 7b, this permanent installation part 210 is embedded and permanently installed by the floor plate concrete (C) of the bridge girder 300, but the bracket 212a of the permanent installation part 210 ) The reusable disassembly part 220 connected to the pin is a hinge connection means, and when the pin 221e is removed, the reusable disassembly part 220 can be easily moved from the permanent installation part 210 to the lower space of the constructed floor plate 400. It can be dismantled by rotating downward without interference, making it possible to secure constructability and efficiency.

Next, the reusable disassembly part 220 is a part that is detachably connected to the permanent installation part 210, as shown in FIGS. 3A and 3B, and supports the GFRP deck 100 equipped with a cantilever bracket 200 and transmits it. In addition to serving to transmit the load from below the permanent installation part 210 to the bridge girder 300,

If the bridge girder (300) is a PSC girder, it contacts the upper flange side, and if it is a steel box girder, it contacts the abdominal side, and also serves to adjust the gradient of the GFRP deck (100) equipped with a cantilever bracket (200). I do it.

To this end, the reuse and disassembly unit 220 is formed to include a deck support unit 221 and a gradient adjustment unit 222, as shown in FIGS. 3A and 3B.

Accordingly, referring to FIGS. 3A and 3B, the deck support portion 221 is formed to include both lower support plates 221b on the bottom of the upper plate 221a and a lower plate 221c, which is a horizontal plate on the bottom of both lower support plates 221b. It can be seen that this can be done, and the GFRP deck (100) equipped with the cantilever bracket (200) can be stably supported, but it is manufactured using steel to prevent the weight from increasing.

For this, referring to Figures 3a and 3b,

Forming a top plate 221a in the form of a horizontal plate,

They are spaced apart from each other on the bottom of the upper plate (221a), and the height gradually decreases as the distance from the bridge girder (300) increases, and a reinforcement plate in the form of a vertical plate is formed in the form of a partition on the inner side to form both lower support plates (221b),

It can be seen that the deck support portion 221 can be formed with the lower plate 221c in the form of a horizontal plate on the bottom of both lower support plates 221b on the bridge girder 300 side.

In particular, in the case of the lower plate 221c, the bottom surfaces of both lower support plates 221b are formed at the center, and gradient adjustment parts 222 are formed on the upper surfaces of both sides.

At this time, the upper plate 221a in the form of a horizontal plate adjusts the extension length so that the connection bracket 221d with a pin hole is exposed so that the pins 221e of both lower support plates 221b can penetrate horizontally,

The bracket 212a with the pinhole of the permanent installation part 210 overlaps the connection bracket 221d with the pinhole of the reusable disassembly part 220 so that the pinholes communicate, and the pin 221e is inserted into the communicating pinholes. By doing so, the reusable and dismantled part 220 is connected to the permanent installation part 210 so that it can rotate and be separated.

Next, referring to FIGS. 3A and 3B, the slope adjustment unit 222 is installed on the upper surfaces of both sides of the lower plate 221c of the deck support unit 221 and includes a support bracket 222a and a slope adjustment bolt 222b. It can be seen that it can be formed,

It serves to directly transfer the load from the cantilever bracket (200) to the bridge girder (300), and adjusts the separation distance from the bridge girder (300) to determine the installation gradient of the GFRP deck (100) equipped with the cantilever bracket (200). It plays a role in coordinating.

Next, the extended cantilever bracket (200b) corresponds to the basic cantilever bracket discussed above with length and support extensions (230, 240) according to the size of the GFRP deck (100) equipped with the cantilever bracket (200) and the bridge girder (300). In order to secure additional support performance according to

3C and 3D, it includes a permanent installation part 210, a reusable disassembly part 220, a length extension part 230, and a support extension part 240, and the permanent installation part 210 and the reusable disassembly part 240 are included in the permanent installation part 210. Part 220 is the same as seen in FIGS. 3A and 3B.

Accordingly, the permanent installation part 210 refers to a part that is permanently fixed and installed on the side of the bridge girder 300, as shown in FIGS. 3C and 3D. If the bridge girder 300 is a PSC girder, an anchor, In the case of a steel box girder, it is permanently installed on the bridge girder 300 by fixing means such as welding, but is formed so that it can be separated from the reuse and disassembly part 220,

According to Figures 3c and 3d, it can be seen that, as a trapezoidal horizontal plate, a through hole 211 is formed on one side of the bridge girder so that a fixing means such as an anchor can be installed through it, and the reusable disassembly part ( It can be seen that the rotary connection portion 212 can be formed on the bottom of the other side so that it can be separated from the 220),

As seen above, this rotary connection part 212 is formed by a bracket 212a with a pinhole formed on the bottom of the other side of the permanent installation part 210 and is rotatably connected to the pin 221e installed in the reusable disassembly part 220. same.

Next, as shown in FIGS. 3C and 3D, the reusable disassembly part 220 is a part that is detachably connected to the permanent installation part 210, and supports the GFRP deck 100 equipped with a cantilever bracket 200 while delivering it. It serves to transmit the load from below the permanent installation part 210 to the bridge girder 300,

If the bridge girder (300) is a PSC girder, it is in contact with the upper flange side, and in the case of a steel box girder, it is in contact with the abdominal side, and the gradient of the GFRP deck (100) equipped with a cantilever bracket (200) can be adjusted. As we saw earlier,

Accordingly, the reuse and disassembly part 220 is formed to include a deck support part 221 and a gradient adjustment part 222, as shown in FIGS. 3C and 3C,

Accordingly, referring to FIGS. 3C and 3C, the deck support portion 221 is formed to include both lower support plates 221b on the bottom of the upper plate 221a and a lower plate 221c, which is a horizontal plate on the bottom of both lower support plates 221b. As we have seen, it can be done.

Next, referring to FIGS. 3C and 3C, the slope adjustment unit 222 is installed on the upper surfaces of both sides of the lower plate 221c of the deck support unit 221 and includes a support bracket 222a and a slope adjustment bolt 222b. As we have seen, it can be formed.

In addition, the upper plate 221a in the form of a horizontal plate adjusts the extension length so that the connection bracket 221d with a pin hole is exposed so that the pins 221e of both lower support plates 221b can penetrate horizontally, and the permanent installation part 210 ) The bracket 212a with the pinhole is overlapped with the connection bracket 221d with the pinhole of the reusable disassembly unit 220 so that the pinholes communicate, and the pin 221e is inserted into the communicating pinholes, so that it is permanently installed. As previously discussed, the reusable and dismantled unit 220 is rotatably connected to the unit 210.

Next, referring to FIGS. 3C and 3C, the length extension portion 230 is configured to further secure the extension length of the reuse and disassembly portion 220 of the basic cantilever bracket. Although it can be made longer, if the extension length of the reusable disassembly part 220 is manufactured collectively, the weight is unnecessarily increased and the manufacturing cost is bound to increase, so the present invention reuses the length extension part 230. This problem is solved by allowing additional installation and disassembly in the disassembly unit 220.

Accordingly, the length extension portion 230 is inserted between both lower support plates 221b formed on the bottom of the upper plate 221a of the reusable and dismantled portion 220 so that the upper plate 221a of the reusable and dismantled portion 220 extends, but both lower support plates It is inserted into (221b) and formed to be fixed.

Referring to FIGS. 3C and 3D, it has a rectangular ring shape and is formed of an additional upper plate 231 integrated with the upper surface of the insertion expansion portion 232 with a plurality of through holes formed on both sides,

The additional upper plate 231 is in contact with the side of the upper plate 221a of the reusable and dismantled portion 220 so that the length of the upper plate 221a of the reusable and disassembled portion 220 is extended, and the insertion and expansion portion 232 is formed on both lower support plates. Inserted between (221b),

The position is fixed by a fixing bolt 233 passing through the through hole of both lower support plates 221b and the insertion extension part 232, and the length extension part 230 is reused by separating the fixing bolt 233. It can be easily separated from the disassembly part 220.

Accordingly, it is possible to have a length extension part 230 with various extension lengths depending on the design, etc., thereby enabling a GFRP deck 100 equipped with cantilever brackets 200 of various specifications. By installing and removing the fixing bolt 233, You can see that it is removable.

Next, referring to FIGS. 3C and 3C, the support extension unit 240 is used to adjust the gradient when it is difficult to directly contact the gradient adjustment unit 222 of the reuse and disassembly unit 220 with the side and abdomen of the bridge girder 300. The position of the adjustment unit 222 is moved downward so that it can come into contact with the bridge girder 300. Also, if the gradient adjustment unit 222 is positioned further downward, the height of the reusable disassembly unit 220 of the basic cantilever bracket can be formed larger.

If the formation height of the reuse and disassembly part 220 is extended in batches, the weight is unnecessarily increased and the manufacturing cost inevitably increases, so the present invention adds the support extension part 240 to the reuse and disassembly part 220. This problem is solved by allowing installation and disassembly.

This support extension 240 is formed with both inclined brackets 242 on the bottom of the upper plate 241 so that it can be fastened upward and downward with the reusable disassembly section 220 by fixing bolts, and the bottom of both inclined brackets is connected to the lower plate ( 243) It can be seen that it can be formed in the central part by moving the position of the gradient adjustment unit 222 to the upper surface on both sides of the lower plate.

Figure 4 shows an example of gradient adjustment of the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention and an example of separation of the cantilever bracket. At this time, the gradient of both the basic cantilever bracket 200a and the extended cantilever bracket 200b can be adjusted by the gradient adjustment unit 222.

That is, referring to FIG. 4A, the bridge girder 300 may be formed, for example, in a straight or curved shape, and may have a gradient in the transverse direction according to the linear shape, etc., and is provided with a cantilever bracket 200 along with a deck drain. One GFRP deck (100) also needs to have a lateral gradient.

Accordingly, referring to FIG. 4A, the present invention rotates the gradient adjustment bolt (222b) penetrating the support bracket (222a) of the gradient adjustment unit (222) toward the bridge girder (300) or approaches the bridge girder (300). By rotating the gradient adjustment bolt (222b) away from the

It can be seen that the cantilever bracket 200 has an upward and downward gradient in the horizontal direction and can also adjust the horizontal gradient of the GFRP deck it supports.

Accordingly, the support bracket 222a of the deck support 221 is formed as both brackets with bolt holes through which the gradient adjustment bolt 222b passes and supports the state in contact with the bridge girder 300,

The slope adjustment bolt (222b) penetrates the bolt hole of the support bracket (222a) so that one side is in contact with the bridge girder (300) and can stably support the GFRP deck (100) equipped with a cantilever bracket (200). And,

The gradient adjustment bolt (222b) is fastened and fixed to the support bracket (222a) using a fixing nut to support the GFRP deck (100) equipped with a stable cantilever bracket (200).

In addition, referring to Figure 4b, the reusable disassembly part 220 of the basic cantilever bracket can be set to contact the upper flange side of the PSC girder as the bridge girder 300 by the gradient adjustment part 222.

In the case of a steel box girder as the bridge girder 300, the upper flange is thin and the abdomen is located inward from the side end of the upper flange, so it is reused by additionally installing a support extension 240 on the reusable disassembly part 220. It can be seen that the dismantled part 220 can be set to effectively contact the abdomen of the steel box girder through the support extension part 240.

Figures 5a, 5b and 5c are exemplary diagrams of the GFRP deck 100 provided with the central GFRP deck (D) and the cantilever bracket 200 of the present invention.

First, the central GFRP deck (D) and the GFRP deck (100) equipped with the cantilever bracket (200) are basically the same GFRP deck, except that they are distinguished by the installation location.

That is, a central GFRP deck (D) is installed between the bridge girders 300 so that it extends laterally and both ends are supported between the upper surfaces of the bridge girders 300,

A GFRP deck (100) with a cantilever bracket (200) is installed to extend longitudinally on the side of the bridge girder (300) and be supported by the cantilever bracket (200).

The GFRP deck (100) equipped with the central GFRP deck (D) and the cantilever bracket (200) includes a precast concrete body (110), a GFRP reinforcement (120), and an internal wire (130).

First, referring to FIGS. 5A, 5B and 5C, the precast concrete body 110 is in the form of a horizontal plate formed of concrete with a certain thickness, and is formed of a plain concrete horizontal plate that is not otherwise reinforced with internal reinforcement. will be.

Next, referring to FIGS. 5A, 5B and 5C, the GFRP reinforcement 120 is a beam member made of GFRP (Glass Fiber Reinforced Polymer) and is located inside the precast concrete body 110. The lower part is buried and the upper part is exposed.

At this time, the lower flange of the GFRP reinforcement (120), which is the beam member, has its abdomen penetrated by the internal wire (130) made of internal GFRP, so that it moves integrally with the position setting.

At this time, according to FIG. 5C, it can be seen that the GFRP reinforcement 120 can be formed into various cross-sections (triangular cross-section, etc.) including H-shaped, square tube, double square tube, pie-shaped, and double pie-shaped cross-sections.

Next, referring to FIGS. 5A, 5B, and 5C, the inner wire 130 is the lower flange of the GFRP reinforcement 120 located inside the precast concrete body 110. It serves to fix the position at the bottom of the neutral axis and connect the multiple GFRP reinforcements 120 so that they move as one unit, and a wire made of GFRP (Glass Fiber Reinforced Polymer) is used.

It can be seen that this wire can be formed into a simple structure because it is used as a closed horizontal member that penetrates the abdomen of the GFRP reinforcement 120, which is a beam member.

[Construction method of GFRP deck (100) equipped with cantilever bracket (200) of the present invention]

Figures 6a, 6b, 7a and 7b show examples of the construction method of the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention.

First, the construction method of the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention according to FIGS. 6a and 6b is a GFRP deck 100 equipped with a cantilever bracket 200 on a PSC girder as a bridge girder 300. ) on how to construct a GFRP deck,

The construction method of the GFRP deck (100) equipped with the cantilever bracket (200) of the present invention according to FIGS. 7A and 7B is a GFRP deck (100) equipped with a cantilever bracket (200) on a steel box girder as a bridge girder (300). Regarding the method of constructing a GFRP deck,

The only difference is how to fix the permanent installation part 210 to the bridge girder 300, but installing the GFRP deck using the GFRP deck 100 equipped with a cantilever bracket 200 is the same.

First, looking at the construction method of the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention according to FIGS. 6A and 6B,

As shown in Figure 6a, a PSC girder is installed as a bridge girder 300, the central GFRP deck (D) is installed between the PSC girders, and the cantilever bracket 200 previously seen is anchored on the side of the PSC girder as a fixing means. It is installed using .

At this time, the PSC girder includes a prestressed reinforced concrete girder manufactured by precast method and refers to a concrete girder,

The PSC girder is made of concrete and is usually manufactured with an I-shaped cross section formed by an upper flange, a belly flange, and a lower flange.

Accordingly, the central GFRP deck (D) is set horizontally between the upper flanges so that both ends are supported on the upper surface of the upper flange of the PSC girder,

The cantilever bracket 200 for installing the GFRP deck 100 equipped with the cantilever bracket 200 is installed on the upper surface of the PSC girder installed on the side using fixing means (anchor).

At this time, the cantilever bracket 200 is installed on the upper surface of the upper flange of the PSC girder on the side, as previously discussed, one of the basic cantilever bracket 200a and the extended cantilever bracket 200b,

The GFRP deck (100) equipped with a basic cantilever bracket or an extended cantilever bracket and a cantilever bracket is set longitudinally on the upper surface of the upper flange of the PSC girder on the side, so that both ends are supported on the upper surface of the basic cantilever bracket or the extended cantilever bracket.

At this time, referring to FIGS. 3A and 3B, the basic cantilever bracket is formed to include a permanent installation part 210 and a reusable disassembly part 220,

Referring to FIGS. 3C and 3D, the extended cantilever bracket is obtained by adding length and support extensions (230, 240) to the basic cantilever bracket, and is selected according to the extended length of the GFRP deck (100) equipped with the cantilever bracket (200). I do it.

In addition, according to Figure 6a, the fixing means for fixing the cantilever bracket 200 to the upper surface of the PSC girder on the side is an anchor, and the fixing means, which is the anchor, is a through hole formed in the permanent installation portion 210 of the cantilever bracket 200. The permanent installation part 210 is permanently fixed and installed on the upper surface of the PSC girder on the side so that it penetrates the hole 211, and the reusable disassembly part 220 is installed to be detachable in this permanent installation part 210.

At this time, the gradient adjustment bolt (222b) penetrating the support bracket (222a) of the gradient adjustment unit (222) constituting the reusable disassembly unit (220) is rotated to approach the bridge girder (300) or the bridge girder (300) By rotating the slope adjustment bolt (222b) away from the side, the cantilever bracket 200 has an upward and downward slope in the horizontal direction and also adjusts the horizontal slope of the GFRP deck that it supports.

Next, as shown in Figure 6b, the floor plate concrete (C) is poured and cured on the central GFRP deck (D) and the cantilever bracket (200) installed on the upper surfaces of the PSC girder to complete the floor plate, and the permanent installation part (210) The reuse and disassembly unit 220 installed to be separable is separated.

That is, as seen above, the floor plate concrete (C), which is poured using the shear connector 310 installed on the upper surface of the PSC girder, and the central GFRP deck (D) and cantilever bracket (200) installed on the upper surfaces of the steel box girder. They are synthesized and integrated, and the pinhole-formed bracket 212a of the permanent installation part 210 overlaps the pinhole-formed connection bracket 221d of the reusable disassembly part 220 so that the pinholes communicate, so that the pins 221e communicate. The reusable disassembly part 220 is rotatably connected to the permanent installation part 210 by being inserted into the pinholes, so that the reusable disassembly part 220 can be easily removed from the permanent installation part 210 by removing the inserted pin 221e. The part 220 is dismantled by rotating downward so that it can be reused.

Next, looking at the construction method of the GFRP deck 100 equipped with the cantilever bracket 200 of the present invention according to FIGS. 7A and 7B,

As shown in Figure 7a, a steel box girder is installed as the bridge girder 300, the central GFRP deck (D) is installed between the PSC girders, and the cantilever bracket 200, which was also seen previously, is installed on the side of the steel box girder as a fixing means. It is installed using welding.

At this time, the steel box girder refers to a steel girder with a box-shaped cross section manufactured by precast method,

The steel box girder is made of steel and is usually manufactured with a box-shaped cross section formed by an upper flange, an abdominal flange, and a lower flange.

Accordingly, the central GFRP deck (D) is set horizontally between the upper flanges so that both ends are supported on the upper surface of the upper flange of the steel box girder,

The cantilever bracket 200 for installing the GFRP deck 100 equipped with the cantilever bracket 200 is installed on the upper surface of the steel box girder installed on the side using fixing means (welding).

At this time, the cantilever bracket 200 is installed on the upper surface of the upper flange of the side steel box girder, as previously discussed, one of the basic cantilever bracket 200a and the extended cantilever bracket 200b,

A GFRP deck (100) equipped with a basic cantilever bracket or an extended cantilever bracket is installed longitudinally on the upper surface of the upper flange of the steel box girder on the side, so that both ends are supported on the upper surface of the basic cantilever bracket or an extended cantilever bracket. .

At this time, referring to FIGS. 3A and 3B, the basic cantilever bracket is formed to include a permanent installation part 210 and a reusable disassembly part 220,

Referring to FIGS. 3C and 3D, the extended cantilever bracket is obtained by adding length and support extensions (230, 240) to the basic cantilever bracket, and is selected according to the extended length of the GFRP deck (100) equipped with the cantilever bracket (200). What happens is the same as what we saw earlier.

In addition, according to Figure 7a, the fixing means for fixing the cantilever bracket 200 to the upper surface of the steel box girder on the side is welding, and the welding fixing means fixes the permanent installation portion 210 of the cantilever bracket 200 to the side. It is the same that it is permanently welded and fixedly installed on the upper surface of the steel box girder, and the reusable disassembly part 220 is installed in a detachable manner on this permanent installation part 210.

At this time, the gradient adjustment bolt (222b) penetrating the support bracket (222a) of the gradient adjustment unit (222) constituting the reusable disassembly unit (220) is rotated to approach the bridge girder (300) or the bridge girder (300) By rotating the slope adjustment bolt (222b) away from the side, the cantilever bracket 200 has an upward and downward slope in the horizontal direction and also adjusts the horizontal slope of the GFRP deck that it supports.

Next, as shown in Figure 7b, the floor plate is completed by pouring and curing the floor plate concrete (C) on the central GFRP deck (D) and the cantilever bracket (200) installed on the upper surfaces of the steel box girder, and the permanent installation part (210) ) The reuse and disassembly unit 220 installed to be separable is separated.

That is, as seen above, the floor plate concrete (C) is poured using the shear connector 310 installed on the upper surface of the steel box girder, and the central GFRP deck (D) and cantilever bracket (200) installed on the upper surfaces of the steel box girder. are synthesized and integrated, and the pinhole-formed bracket 212a of the permanent installation part 210 overlaps the pinhole-formed connection bracket 221d of the reusable disassembly part 220 so that the pinholes communicate, so that the pin 221e The reusable disassembly part 220 is rotatably connected to the permanent installation part 210 by being inserted into the communicating pinholes, so that the inserted pin 221e can be easily removed and reused from the permanent installation part 210. In the same manner, the disassembly part 220 is dismantled by rotating downward so that it can be reused.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: GFRP deck with cantilever bracket
110: Precast concrete body
120: GFRP reinforcement 130: Internal wire
200: Cantilever bracket
200a: Basic cantilever bracket 200b: Extended cantilever bracket
210: Permanent installation part 211: Through hole
212: Rotating connection 212a: Bracket
220: Reuse and disassembly unit
221: Deck support 221a: Top plate
221b: Both lower support plates 221c: Lower plate
221d: Connection bracket 221e: Pin
222: Gradient adjustment unit
222a: Support bracket 222b: Gradient adjustment bolt
230: Length extension part 231: Additional top plate
232: Insertion expansion part 233: Fixing bolt
240: support extension part
241: Top plate 242: Double inclined bracket
243: Lower plate
300: Bridge girder 310: Shear connector
400: Bottom plate
C: Floor concrete D: Central GFRP deck

Claims (10)

In the cantilever bracket 200 including a reusable disassembly part 220 that is removably connected to a permanent installation part 210 embedded in the floor plate 400,
The reusable disassembly part 220 pin-connected to the bracket 212a of the permanent installation part 210 is a hinge connection means, and when the pin 221e is removed, the reusable disassembly part 220 from the permanent installation part 210 is installed on the floor. It is dismantled by rotating downward without interference in the lower space of the plate 400,
The cantilever bracket 200 has both inclined brackets 242 formed on the bottom of the upper plate 241 so that it can be fastened upward and downward by the reusable disassembly part 220 and the fixing bolt, and the bottom of both inclined brackets is the lower plate 243. ) A cantilever bracket that is formed in the center and includes a support extension portion 240 that is formed by moving the gradient adjustment portion 222 to the upper surface on both sides of the lower plate. According to paragraph 1,
The permanent installation part 210 is,
The permanent installation part 210 is a horizontal plate, and a through hole 211 is formed on one side of the bridge girder so that the fixing means can be installed through it, and a rotating connection part 212 is formed on the other side so that it can be separated from the reusable disassembly part 220. It is formed on the bottom, and the rotation connecting part 212 is formed as a bracket 212a with a pinhole formed on the other side of the permanent installation part 210, and is rotatably connected to the pin 221e installed in the reusable disassembly part 220. A cantilever bracket. According to claim 1 or 2,
The reuse and disassembly unit 220,
Two lower support plates (221b) spaced apart from each other on the bottom of the horizontal plate-shaped upper plate (221a), but whose height gradually decreases as they move away from the bridge girder (300); And a lower plate (221c) formed in the form of a horizontal plate on the bottom of both lower support plates (221b) on the side of the bridge girder (300). It includes a deck support portion (221), which includes both lower support plates (221c) in the center of the lower plate (221c). 221b) A cantilever bracket in which the bottom is formed in the center and gradient adjustment parts 222 are formed on the upper surfaces of both sides. According to paragraph 3,
The gradient adjustment unit 222,
Rotate the slope adjustment bolt (222b) penetrating the support bracket (222a) toward the bridge girder (300) to approach it, or rotate the slope adjustment bolt (222b) away from the bridge girder (300) to secure the cantilever bracket ( 200) is a cantilever bracket that allows the horizontal gradient of the GFRP deck to be adjusted while having an upward and downward gradient in the horizontal direction. According to paragraph 1,
It is inserted between both lower support plates 221b formed on the bottom of the upper plate 221a of the reusable disassembly unit 220 so that the upper plate 221a of the reusable disassembly unit 220 extends, and is inserted into and fixed to both lower support plates 221b. A cantilever bracket further including a length extension portion 230 formed to be as large as possible. (a) Install a PSC girder as a bridge girder (300), install the central GFRP deck (D) between the PSC girders, and use an anchor as a means of fixing the cantilever bracket (200) of Paragraph 1 on the side of the PSC girder. Installing steps; and
(b) A precast deck installed as a half-precast, supported by a cantilever bracket (200) to extend longitudinally on the side of the central GFRP deck (D) installed on the upper surfaces of the PSC girder and the bridge girder (300). The floor plate is completed by pouring and curing the floor plate concrete (C) on the upper part of the GFRP deck (100) equipped with the cantilever bracket (200), and the reusable disassembly section (220) is installed to be detachable in the permanent installation section (210). Including the step of separating,
The cantilever bracket 200 in step (a) has a double inclined bracket 242 formed on the bottom of the upper plate 241 so that it can be fastened top and bottom with the reusable disassembly portion 220 and fixing bolts, and the double inclined bracket The bottom surface is formed in the central part of the lower plate 243, and the support extension part 240 is formed by moving the gradient adjustment part 222 to the upper surface on both sides of the lower plate.
GFRP deck construction method with cantilever brackets. (a) Install a steel box girder as a bridge girder (300), install the central GFRP deck (D) between the PSC girders, and anchor the cantilever bracket (200) of Paragraph 1 on the side of the steel box girder as a fixing means. Installation using; and
(b) A precast deck installed as a half-precast, supported by a cantilever bracket (200) to extend longitudinally on the side of the central GFRP deck (D) installed on the upper surfaces of the PSC girder and the bridge girder (300). The floor plate is completed by pouring and curing the floor plate concrete (C) on the upper part of the GFRP deck (100) equipped with the cantilever bracket (200), and the reusable disassembly section (220) is installed to be detachable in the permanent installation section (210). Including the step of separating,
The cantilever bracket 200 in step (a) has a double inclined bracket 242 formed on the bottom of the upper plate 241 so that it can be fastened upward and downward by the reusable disassembly portion 220 and the fixing bolt, and the double inclined bracket The bottom surface is formed in the central part of the lower plate 243, and the support extension part 240 is formed by moving the gradient adjustment part 222 to the upper surface on both sides of the lower plate.
GFRP deck construction method with cantilever brackets. According to clause 6 or 7,
The cantilever bracket 200 in step (a) is,
It further includes a length extension part 230, wherein the length extension part 230 includes,
The additional upper plate 231 is in contact with the side of the upper plate 221a of the reusable and dismantled portion 220 so that the length of the upper plate 221a of the reusable and disassembled portion 220 is extended, and the insertion and expansion portion 232 is provided with both lower support plates ( 221b), and is fixed in position by a fixing bolt 233 passing through the through hole of both lower support plates 221b and the insertion extension part 232. The fixing bolt 233 is separated to change the length. A GFRP deck construction method equipped with a cantilever bracket that separates the expansion part (230) from the reuse and disassembly part (220). delete According to clause 8,
The GFRP deck (100) equipped with the central GFRP deck (D) and the cantilever bracket is
A precast concrete body 110 formed of a plain concrete horizontal plate;
A beam member made of GFRP (Glass Fiber Reinforced Polymer), the lower part of which is embedded in the precast concrete body 110, and the upper part of which is exposed. GFRP reinforcement (120); and
The lower flange of the GFRP reinforcement 120 located inside the precast concrete body 110 can be fixed to the lower part of the neutral axis of the precast concrete body 110, so that the multiple GFRP reinforcements 120 move as one unit. Includes an internal wire 130 that connects to
The GFRP reinforcement (120) is a GFRP deck construction method including a cantilever bracket including at least one of H-type, square pipe, double square pipe, pie-shaped, and double pie-shaped cross sections.