KR102584444B1 - Installation method of bridge superstructure using temporary through truss - Google Patents

Abstract

The present invention allows the construction of a bridge superstructure on the upper part of the floor support frame after mounting a temporary truss consisting of a floor support frame and a pair of truss main shafts on the upper part of the vent installed on the outside of the bridge substructure, so that the lower part of the newly constructed bridge can be installed. This is about a method of installing a bridge superstructure using a temporary lower truss that can minimize the longitudinal gradient of the road by maximizing the lower profile space while operating the bridge space as is.
The present invention is to install a superstructure on top of a pair of bridge substructures installed to be spaced apart from each other in the direction of the bridge, including the steps of (a) installing a vent on one side of each bridge substructure; (b) A temporary lower truss consisting of a floor support frame, an upper chord, a lower chord, and a pair of truss main members whose lower ends are connected to both sides of the floor support frame, and of a stay member connecting the upper chord and the lower chord. Mounting on top of the vent; (c) constructing a bridge superstructure on the upper part of the bottom support frame of the temporary truss; (d) dismantling and removing the truss main structure from the floor support frame; (e) removing the floor support frame; and (f) removing the vent; It is characterized by being composed of.

Description

Installation method of bridge superstructure using temporary through truss}

The present invention allows the construction of a bridge superstructure on the upper part of the floor support frame after mounting a temporary truss consisting of a floor support frame and a pair of truss main shafts on the upper part of the vent installed on the outside of the bridge substructure, so that the lower part of the newly constructed bridge can be installed. This is about a method of installing a bridge superstructure using a temporary lower truss that can minimize the longitudinal gradient of the road by maximizing the lower profile space while operating the bridge space as is.

When a road or sidewalk intersects a railroad track in plan and must cross the railroad track, a railroad crossing is usually installed in a place with low traffic volume. However, in areas with high traffic, there is a risk of traffic congestion and collisions when installing a crossing, so underpasses or overpasses are mainly installed.

However, underground driveways are complicated to construct, have high construction costs, and require separate drainage facilities. In contrast, overpass bridges are relatively easy to construct and cost-effective, so they are widely applied (Figures 1 and 2).

When constructing an overbridge, various construction methods such as FSM, ILM, FCM, and PSM can be adopted to install the bridge superstructure.

FSM (Full Staging Method) is a method of constructing a brace (vent) across the entire bridge span and constructing the bridge superstructure on top of the span. The FSM method requires low equipment costs and is easy to construct.

However, as assembly and disassembly work is required, the construction period is long, and when applied to existing over-track sections, use of track rails and interruption of train operations are inevitable. In addition, when installing the superstructure in the overpass section, a height of at least 7.2 m must be secured from the train rail to the bottom of the superstructure, but the FSM method requires a lot of support costs when the height of the superstructure is high, making it less economical.

In addition, ILM (Incremental Launching Method) involves manufacturing the bridge superstructure into segments at a workshop installed at the rear of the abutment and then gradually constructing the bridge by pushing it in the direction of the bridge axis. Using special temporary equipment, post-tensioning is achieved by balancing left and right from each pier. The Free Cantilever Method (FCM), which constructs a span by sequentially connecting segments, and the Precast Span Method (PSM), which constructs a PC box girder of one span one span at a time using special moving and temporary equipment, are used to create overbridge bridges without temporary braces. can be constructed.

However, when these methods are applied to over-track sections, safety facilities such as rails, poles, and high-voltage wires must be installed to ensure the safety of railroad facilities. At this time, safety facilities can be installed in the form of a temporary bridge to ensure the continuous operation of the train. In this case, the installation location of the superstructure must be as high as the temporary bridge height to secure the height of 7.2m for the overtrack section. As a result, the longitudinal gradient of the road increases, which has the disadvantage of increasing construction costs.

KR 10-0924277 B1

In order to solve the above problems, the present invention aims to provide a method of installing a bridge superstructure using a temporary truss that can maintain the operation of the bridge space as is, such as allowing railroads or subways to pass through the lower part of a newly constructed bridge when installing the bridge superstructure. do.

In addition, the present invention seeks to provide a method of installing a bridge superstructure using a temporary lower truss that can minimize the longitudinal gradient of the road by securing maximum geometry space.

The present invention according to a preferred embodiment is to install a superstructure on top of a pair of bridge substructures installed to be spaced apart from each other in the bridge direction. (a) A temporary vent is installed on one side of each bridge substructure, while the Installing a pair of guide rail parts crossing in the bridge width direction on the inside of the bridge substructure to be spaced apart from each other in the bridge axis direction, and installing a transfer truck on top of each guide rail part; (b) A temporary lower truss consisting of a floor support frame, an upper chord, a lower chord, and a pair of truss main members whose lower ends are connected to both sides of the floor support frame, and of a stay member connecting the upper chord and the lower chord. Mounting on top of the vent; (c) constructing a bridge superstructure on the upper part of the bottom support frame of the temporary truss; (d) dismantling and removing the truss main structure from the floor support frame; (e) moving the transfer trolley to the outside of the bridge superstructure while the floor support frame is mounted on the top of the transfer trolley, and then removing the floor support frame; and (f) removing the vent; In step (b), the transfer trolleys installed on the upper part of each guide rail are provided in pairs, the upper ends of the pair of transfer trolleys are connected by a link beam, and the floor support frame Provides a method of installing a bridge superstructure using a temporary truss, which is mounted on the upper surface of the link beam.

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In the present invention according to another preferred embodiment, in step (b), the floor support frame is mounted on the upper part of the transfer trolley, and then the truss main body is mounted on the upper part of the gargantu and coupled to both sides of the floor support frame. A method of installing a bridge superstructure using a temporary truss is provided, wherein the truss is assembled under a temporary structure.

The present invention according to another preferred embodiment provides a method of installing a bridge superstructure using a temporary lower truss, wherein the transport bogie is configured to be height-adjustable.

The present invention according to another preferred embodiment provides a method of installing a bridge superstructure using a temporary lower truss, characterized in that a plurality of brackets coupled to the ends of the floor support frame are provided on the inside of the lower chord of the main groove of the truss.

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According to the present invention, a temporary vent is installed on the outside of the bridge substructure, and then the truss is installed on the upper part of the temporary vent in a U-shaped temporary structure consisting of a floor support frame and a pair of truss main shafts, and then the bottom of the truss is installed under the temporary structure. A method of installing a bridge superstructure using a truss can be provided as a temporary structure that allows the bridge superstructure to be constructed from the upper part of the support frame.

In particular, the lower end of the truss main body is connected to the side of the floor support frame, so the height that protrudes from the lower part of the bridge superstructure is low, so it is possible to maintain the operation of the bridge space at the bottom of the newly built bridge and secure the profile space as much as possible to maintain the longitudinal gradient of the road. can be minimized.

In addition, since the truss main body is made of truss members, it is light in weight and has high rigidity, making installation easy and stably supporting the load of the bridge superstructure.

Figure 1 is a plan view showing the installation position of the overbridge.
Figure 2 is a front view of Figure 1.
Figure 3 is a plan view showing the installation state of the vent.
Figure 4 is a front view of Figure 3.
Figure 5 is a front view and a cross-sectional view showing the main truss structure.
Figure 6 is a cross-sectional view showing a temporary truss.
Figure 7 is a plan view showing the installation state of the temporary truss.
Figure 8 is a front view of Figure 7.
Figure 9 is a cross-sectional view of Figure 7.
Fig. 10 is a plan view showing the installation state of the superstructure.
Figure 11 is a front view of Figure 10.
Figure 12 is a cross-sectional view of Figure 10.
Fig. 13 is a cross-sectional view showing the removed state of the truss main sphere.
Figure 14 is a cross-sectional view showing the removed state of the floor support frame.
Fig. 15 is a cross-sectional view showing a state in which a gar vent is removed.
Figure 16 is a plan view showing the installation state of the guide rail portion and the transfer cart.
Figure 17 is a cross-sectional view showing a state in which a temporary truss is installed on the upper part of the transfer cart and the vent.
Figure 18 is a cross-sectional view showing the state of removal of the floor support frame by the transfer truck.
Figure 19 is a cross-sectional view showing the installation state of the floor support frame by the transfer cart.
Figure 20 is a cross-sectional view showing the installation state of the main truss structure after installation of the floor support frame.

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

Figure 3 is a plan view showing the installation state of the vent, and Figure 4 is a front view of Figure 3. FIG. 5 is a front view and a cross-sectional view showing the main sphere of the truss, and FIG. 6 is a cross-sectional view showing the truss under construction. And Figure 7 is a plan view showing the installation state of the truss under temporary construction, Figure 8 is a front view of Figure 7, and Figure 9 is a cross-sectional view of Figure 7.

In addition, Figure 10 is a plan view showing the installation state of the superstructure, Figure 11 is a front view of Figure 10, and Figure 12 is a cross-sectional view of Figure 10. Additionally, FIG. 13 is a cross-sectional view showing the truss main groove removed, FIG. 14 is a cross-sectional view showing the floor support frame removed, and FIG. 15 is a cross-sectional view showing the vent removed.

The method of installing a bridge superstructure using a temporary truss according to the present invention is to install a superstructure 12 on top of a pair of bridge substructures 11 installed to be spaced apart from each other in the bridge axis direction, (a) each bridge substructure Installing a vent (3) on one side of (11); (b) It consists of a floor support frame (5a), an upper chord (53), a lower chord (54), and a stay member (55) connecting the upper chord (53) and the lower chord (54), the lower ends of each of which support the floor. Mounting a temporary truss (5) consisting of a pair of truss main holes (5b) coupled to both sides of the frame (5a) on the upper part of the gable (3); (c) constructing a bridge superstructure (12) on the upper part of the floor support frame (5a) of the temporary lower truss (5); (d) dismantling and removing the truss main hole (5b) from the floor support frame (5a); (e) removing the floor support frame (5a); and (f) removing the vent (3); It is characterized by being composed of.

In the present invention, when installing the bridge superstructure (12), the operation of the bridge space can be maintained as is, such as allowing a railroad or subway to pass through the lower part of the newly constructed bridge (1), and the longitudinal space of the road can be minimized by securing the profile space as much as possible. It is intended to provide a method of installing a bridge superstructure using trusses as a possible temporary construction.

The present invention is intended to install the superstructure 12 in a bridge (1) in which a superstructure (12), which is a girder and a bridge deck, is provided on the upper part of the substructure (11), which is a pier or abutment.

In particular, the present invention can be applied more effectively when there is insufficient space under the bridge due to railroad facilities (100) such as iron poles passing under the bridge (1) to be dismantled as an overpass bridge through which a railroad or subway passes.

In the present invention, (a) first, a temporary vent (3) is installed on one side of each bridge substructure (11) (FIGS. 3 and 4).

In step (a), a temporary bent (3) is installed after floor preparation.

Before installing the temporary vent (3), a foundation (F) can be constructed to transmit the load of the temporary vent (3) to the ground.

The foundation (F) can be formed by pouring foundation concrete after digging and compacting rubble. Although not shown in the drawing, foundation piles may be constructed at the bottom of the foundation (F) depending on the ground condition.

At least two of the vents 3 may be installed on both sides of the bridge substructure 11. For this purpose, the foundation (F) on which the temporary vent (3) will be installed can be constructed as an independent foundation provided in pairs on each side of the superstructure (12).

After constructing the foundation (F), a temporary vent (3) is installed on the top of each foundation (F).

The temporary vent 3 is a temporary structure to support four points at both ends of the temporary truss 5, which will be described later, and is installed outside the overwire section, so there is no problem in using the overwire section.

After completing the installation of the garland (3), (b) the truss (5) is lifted under the temporary suspension and placed on the upper part of the garland (3) (FIGS. 7 to 9).

The hypothesized truss 5 is composed of a floor support frame 5a and a pair of truss main grooves 5b (FIG. 6).

The floor support frame 5a can be manufactured at a factory or assembled on-site at a separate assembly facility provided on site. The floor support frame 5a may be composed of a plurality of crossbeams 51, which are steel members, and vertical beams 52 connecting the crossbeams 51 (FIGS. 6 and 7).

The truss main body (5b, main member) is composed of upper and lower chords (53) and lower chords (54) arranged vertically and spaced apart from each other, and a stay member (55) connecting the upper chord (53) and the lower chord (54). It is a truss member (Figure 5).

The truss main port 5b is made of a truss member, so it is light in weight and has high rigidity. Therefore, installation is easy and the load of the bridge superstructure 12 can be stably supported. In addition, since workers can move by utilizing the open space between the yarns 55 of the truss main body 5b, assembly and disassembly of the truss main body 5b and the floor support frame 5a are easy.

The lower part of the truss main hole (5b) is coupled to the end of the floor support frame (5a) and consists of a pair of left and right truss main holes (5b) and a floor support frame (5a) provided between the pair of truss main holes (5b). A truss (5) is formed under the hypothesis.

The floor support frame 5a connects the two truss main grooves 5b to each other to prevent the truss main sphere 5b from being distorted.

The temporary truss 5 supports the load of the bridge superstructure 12 and transmits it to the vent 3, and is formed as a whole with a U-shaped cross section.

The floor support frame 5a transfers the construction load of the bridge superstructure 12 to the left and right truss main openings 5b, and the truss main openings 5b support the construction load by bending rigidity.

Since the truss main hole 5b, which is a member supporting the construction load, is located on the side rather than the bottom of the bridge superstructure 12, it protrudes into the lower part of the bridge superstructure 12 only by the thickness of the floor support frame 5a.

Therefore, the height protruding from the lower part of the bridge superstructure 12 is low, and even when there is no space under the bridge due to railroad facilities 100 such as railroads and pontoons, the profile space (passing height) is secured as much as possible to prevent interference from obstacles under the bridge. The superstructure 12 can be constructed by minimizing the installation height. In addition, it can be applied to various bridges (1) such as steep longitudinal, straight, and curved bridges.

Next, (c) in a state where the temporary lower truss 5 is installed on the upper part of the temporary lower truss 5, the bridge superstructure 12 is constructed on the upper part of the bottom support frame 5a of the temporary lower truss 5 ( 10 to 12).

The bridge superstructure 12 can be formed by installing formwork on the upper part of the floor support frame 5a and then pouring concrete on site. In this case, the floor support frame (5a) supports the formwork.

Alternatively, the bridge superstructure 12 may be formed of PSC box girder, steel box girder, plate girder, PSC beam, etc. In this case, since both ends of the girder are directly mounted on the top of the substructure 11, the truss 5 does not directly support the load of the bridge superstructure 12 under temporary conditions. However, a falling object prevention net, etc. may be installed on the upper part of the floor support frame 5a to serve as a falling object prevention facility. Of course, even in this case, if the span is large or heavy, the temporary truss 5 can serve as a temporary support for the superstructure 12.

Thereafter, (d) the truss main hole (5b) is dismantled and removed from the floor support frame (5a) (FIG. 13).

After constructing the bridge superstructure 12, the truss 5 must be removed for temporary installation. However, since the truss main grooves 5b of the temporary truss 5 are located on both sides of the superstructure 12 on which construction has been completed, the temporary truss 5 cannot be immediately removed.

Therefore, the truss main port 5b is dismantled from the floor support frame 5a and then lifted and removed.

And (e) remove the floor support frame (5a) (FIG. 14).

When the truss main hole 5b is removed, there is no interference factor on both sides of the floor support frame 5a, so the floor support frame 5a can be easily removed by moving to the side.

Finally, (f) remove the vent (3) (FIG. 15).

Figure 16 is a plan view showing the installation state of the guide rail portion and the transfer trolley, Figure 17 is a cross-sectional view showing a state in which a temporary truss is installed on the upper part of the transfer trolley and the gable vent, and Figure 18 is a floor support by the transfer trolley. This is a cross-sectional view showing the frame being removed.

In step (a), a pair of guide rail parts 2 crossing in the bridge width direction are installed on the inside of the bridge substructure 11 to be spaced apart from each other in the bridge axis direction, and the upper part of each guide rail part 2 A transfer cart (4) is installed on the transfer cart (4), and in step (e), the transfer cart (4) is placed on the outside of the bridge superstructure (12) with the floor support frame (5a) mounted on the top of the transfer cart (4). After moving to , the floor support frame (5a) can be removed.

With the above-mentioned construction, the truss 5 can be easily mounted on the upper part of the vent 3 since there is no interference factor before the installation of the superstructure 12.

However, after the installation of the bridge superstructure 12 is completed, the temporary truss 5, which has a U-shaped cross section, surrounds the lower part and the side of the bridge superstructure 12, so it is not easy to dismantle the temporary truss 3. not. In particular, when dismantling the truss (3) under the above-mentioned construction, even if the truss main hole (5b) is separated from the floor support frame (5a) and removed first, the floor support frame (5a) located at the lower part of the bridge superstructure (12) is moved laterally. Not easy to move.

Therefore, in step (a) of installing the temporary vent (3), the guide rail part (2) for sliding the floor support frame (5a) laterally is installed horizontally in the bridge width direction on the inside of the bridge substructure (11). It is installed so as to support the guide rail part 2, and a transfer truck 4 capable of traveling along the longitudinal direction of the guide rail part 2 can be installed on the upper part of the guide rail part 2 (FIG. 16).

Before installing the guide rail portion 2, a foundation may be constructed to transmit the load of the guide rail portion 2 to the ground. The foundation on which the guide rail portion 2 will be installed can be constructed as a continuous stem foundation to cross the bridge superstructure 12 (FIGS. 17 and 18).

After the foundation construction, the guide rail portion (2) is installed on the upper part of the foundation.

The guide rail portion 2 is installed at the lower part of the superstructure 12 to be installed so as to cross the superstructure 12 in the bridge direction, and a pair is arranged to be spaced apart from each other in the bridge direction.

The guide rail portion 2 may be formed to be slightly longer than the bridge width and protrude for a certain length to the outside of the bridge superstructure 12.

The upper end of the guide rail portion 2 is installed lower than the lower surface of the bridge superstructure 12, so that a predetermined space can be formed between the lower surface of the bridge superstructure 12.

A rail beam 21 may be provided on the upper surface of the guide rail portion 2 for mounting and moving the transfer cart 4.

When the bridge superstructure 12 is installed in a section of a railway line, etc., it is desirable to install the guide rail part 2 outside the railway track so as not to interfere with the use of the track.

The guide rail portion 2 may be arranged in a direction perpendicular to the direction of the throttling axis, but if the lower track passes obliquely, it is preferable to be placed parallel to the railway track.

After installation of the guide rail part (2), the transfer truck (4) is mounted and installed on the upper part of the rail beam (21) of each guide rail part (2).

The transfer truck (4) is guided by the rail beam (21) of the guide rail portion (2) and can freely move in the bridge width direction.

After installing the guide rail portion (2) and the transfer cart (4), a temporary truss (5) is installed on the upper part of the transfer cart (4) and the gargantuan (3) (FIG. 17).

And in step (e), while the transfer truck 4 supports the lower part of the floor support frame 5a, the transfer truck 4 is slid outward to move the floor support frame 5a to the bridge superstructure 12. It can be moved to the outside of . Afterwards, the floor support frame (5a) is lifted and removed (FIG. 18).

The transfer carts 4 may be installed two on one side of each guide rail part 2 to be spaced apart from each other in order to stably support the transported floor support frame 5a.

The transfer cart (4) and the guide rail portion (2) can be removed together when removing the vent (3) in step (f).

Figure 19 is a cross-sectional view showing the installation state of the floor support frame by the transfer cart, and Figure 20 is a cross-sectional view showing the installation state of the main truss structure after installation of the floor support frame.

In step (b), the floor support frame (5a) is mounted on the upper part of the transfer cart (4), and then the truss main hole (5b) is mounted on the upper part of the gar vent (3), and then the floor support frame (5a) ) The truss (5) can be assembled under construction by joining both sides of the truss.

When the span is large, the truss 5 is enlarged and its weight increases. Therefore, it is difficult to lift the entire truss (5) as a whole and place it on the upper part of the gar vent (3) under the above-mentioned temporary structure.

Therefore, the floor support frame 5a and the truss main shaft 5b can be lifted and installed separately.

For this purpose, the floor support frame 5a can be mounted on the upper part of the transfer truck 4 while the transfer truck 4 is located at the lower part of the bridge superstructure 12 to be installed (FIG. 19).

Thereafter, the truss main port 5b is lifted and placed on the upper part of the vent 3 on both sides of the floor support frame 5a, and then the lower inner side of the truss main port 5b is connected to the side end of the floor support frame 5a. By combining them, the truss (5) can be assembled under temporary construction.

At this time, the truss main body 5b is manufactured in modular form in a factory, etc., and each truss main body 5b module is assembled at the upper part of the floor support frame 5a, then lifted and moved to the side of the floor support frame 5a. It can be combined. In this case, the burden of transporting and lifting the truss main body (5b) is reduced, and the floor support frame (5a) can be used as a workplace, which is advantageous in terms of space utilization.

In this way, the truss main port 5b is mounted on the upper part of the vent 3, and the floor support frame 5a is mounted on the upper part of the transfer cart 4 between the pair of truss main ports 5b, so the floor support The frame (5a) may be formed to have a width narrower than the gap between the bridge vents (3) in the crossing direction.

The floor support frame 5a can be mounted on the upper part of the transfer truck 4 after first moving the transfer truck 4 to the lower position of the bridge superstructure 12.

Alternatively, if it is difficult to lift the floor support frame (5a) due to interference between the vent (3) and the bridge substructure (11), the transfer truck (4) is positioned outside the bridge superstructure (12) and the floor is lifted. After mounting the support frame (5a) on the top of the transfer truck (4), the transfer truck (4) on which the bottom support frame (5a) is mounted can be slidably moved to the position where the bridge superstructure 12 is to be installed ( Figure 19).

In addition, when moving horizontally to install or dismantle the floor support frame 5a, the bridge substructure 11 or the vent 3 may interfere. Therefore, the floor support frame 5a can be formed to have a length shorter than the instantaneous gap between the bridge direction vents 3 and the bridge substructure 11 (FIG. 7). In this case, after installing the floor support frame 5a, the floor support frame 5a can be enlarged by assembling extended floor frames 50a at both ends in the longitudinal direction of the floor support frame 5a.

The extended floor frame (50a) is assembled on site by lifting individual members of the crossbeam (51) at a portion shorter than the truss main hole (5b) at the end of the floor support frame (5a) with an aerial work platform or hoist, and then assembling the truss main hole on both sides. It can be connected to (5b).

As shown in FIGS. 18 and 19, the transfer cart 4 may be configured to have an adjustable height.

To facilitate the joining of the truss main port 5b and the floor support frame 5a, the transfer cart 4 may be configured to have its upper part raised and lowered and height-adjustable.

Accordingly, the transfer truck (4) is raised and lowered with the floor support frame (5a) mounted on the upper part of the transfer truck (4), so that the position of the cross beam (51) of the floor support frame (5a) and the top of the gable vent (3) are raised and lowered. It can be joined after matching the positions of the truss main ports (5b) mounted on (FIGS. 19 and 20).

When dismantling and removing the truss 5 under the above-mentioned construction, the truss main hole 5b is separated and removed from the floor support frame 5a, and then the transfer truck 4 is lowered so that the floor support frame 5a is attached to the bridge superstructure ( The floor support frame 5a can be moved to the outside of the bridge superstructure 12 by separating it from the lower surface of the bridge 12) and then sliding it in the horizontal direction (FIG. 18).

As shown in FIGS. 5 and 6, a plurality of brackets 56 coupled to the ends of the floor support frame 5a may be provided inside the lower chord 54 of the truss main port 5b.

Under the above hypothesis, the truss 5 is composed of a floor support frame 5a and a truss main body 5b, and the floor support frame 5a is mounted on the upper part of the transfer cart 4, and the truss main sphere 5b is When mounted on the upper part of the garland 3, it is difficult to install the floor support frame 5a if the width of the floor support frame 5a is greater than the gap between the garland vents 3 on both sides.

In particular, when the transfer truck 4 is raised and lowered, the floor support frame 5a and the vent 3 interfere with each other.

Therefore, the width of the floor support frame (5a) is formed to be narrower than the instantaneous gap between the two side vents (3), and a bracket 56 is provided on the inside of the lower end of the truss main hole (5b) to connect to the floor support frame (5a). You can.

The bracket 56 can be joined to the end of the crossbeam 51 of the floor support frame 5a by bolting or the like.

As shown in FIG. 5, in order to minimize the member cross-section of the truss main port 5b to reduce weight and reduce the amount of steel, a tension member 57 will be provided in the longitudinal direction on the lower chord 54 of the truss main port 5b. You can.

As shown in FIGS. 16, 17, etc., in step (b), the transfer trolleys 4 installed on the upper part of each guide rail part 2 are provided in pairs, and the pair of transfer trolleys The upper end of (4) is connected to the link beam 40, and the floor support frame 5a can be mounted on the upper surface of the link beam 40.

In order to ensure safety when mounting and lateral movement of the floor support frame 5a, a pair of transport carts 4 provided on the upper part of the guide rail portion 2 may be provided as a pair spaced apart from each other.

In this case, the floor support frame (5a) is stably mounted on the upper part of the transfer cart (4), and a pair of transfer carts (4) are moved so that the transfer carts (4) move as one when the pair of transport carts (4) move in the lateral direction. The upper part of the bogie (4) can be connected to the link beam (40).

The link beam 40 is preferably formed to be longer than the width of the floor support frame 5a in order to stably support the floor support frame 5a.

1: Bridge 100: Railway facility
11: Substructure 12: Superstructure
2: Guide rail part 21: Rail beam
3: Gavent 4: Transfer truck
40: Link beam 5: Temporary halo truss
5a: floor support frame 50a: extended floor frame
5b: Truss main body 51: Crossbeam
52: stringer 53: upper current
54: Ha Hyeon-jae 55: Sajae
56: bracket 57: tension material
F: Basic

Claims (6)

It is intended to install the superstructure (12) on top of a pair of bridge substructures (11) installed to be spaced apart from each other in the bridge direction.
(a) A temporary vent (3) is installed on one side of each bridge substructure (11), and a pair of guide rail parts (2) crossing in the bridge width direction are installed on the inside of the bridge substructure (11). Installing them to be spaced apart from each other in each direction and installing a transfer cart (4) on the upper part of each guide rail part (2);
(b) It consists of a floor support frame (5a), an upper chord (53), a lower chord (54), and a stay member (55) connecting the upper chord (53) and the lower chord (54), the lower ends of each of which support the floor. Mounting a temporary truss (5) consisting of a pair of truss main holes (5b) coupled to both sides of the frame (5a) on the upper part of the gable (3);
(c) constructing a bridge superstructure (12) on the upper part of the floor support frame (5a) of the temporary lower truss (5);
(d) dismantling and removing the truss main hole (5b) from the floor support frame (5a);
(e) moving the transfer truck (4) to the outside of the bridge superstructure (12) with the floor support frame (5a) mounted on the upper part of the transfer truck (4) and then removing the floor support frame (5a) ; and
(f) removing the vent (3); It consists of,
In step (b), the transfer trolleys 4 installed on the upper part of each guide rail part 2 are provided in pairs, and the upper end of the pair of transfer trolleys 4 is connected to the link beam 40. A bridge superstructure installation method using a temporary lower truss, characterized in that the floor support frame (5a) is mounted on the upper surface of the link beam (40).
delete In paragraph 1:
In step (b), the floor support frame (5a) is mounted on the upper part of the transfer cart (4), and then the truss main hole (5b) is mounted on the upper part of the gar vent (3), and then the floor support frame (5a) ) A method of installing a bridge superstructure using a temporary lower truss, characterized in that the temporary lower truss (5) is assembled by joining both sides of the temporary lower truss.
In paragraph 3,
A method of installing a bridge superstructure using a temporary truss, characterized in that the transfer cart (4) is configured to be height adjustable.
In paragraph 3,
A method of installing a bridge superstructure using a temporary lower truss, characterized in that a plurality of brackets (56) coupled to the end of the floor support frame (5a) are provided inside the lower chord (54) of the truss main port (5b).
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