KR102200927B1 - connection structure of composite rahmen bridge using steel brackets for fall prevention and composite rahmen bridge method using the same - Google Patents

Abstract

The present invention relates to a connection structure of a composite Rahman bridge using steel brackets for fall prevention and a construction method for a composite Rahman bridge using the same, by which steel brackets are provided on the lower surface of a PC girder and the upper surfaces of piers, which face each other, in the construction of a composite Rahman bridge and are strongly coupled by a high-tensile bolted connection, thereby stably seating the PC girder and preventing the same from overturning in a temporary construction stage during bridge construction, and providing an excellent Rahman structure against horizontal force during earthquakes. More specifically, the connection structure of a composite Rahman bridge for strongly coupling corner parts between a pair of piers distanced from each other and a PC girder seated on the upper parts of the pair of piers, comprises: first strong coupling members installed on the upper surfaces of the piers; and second strong coupling members installed on the lower surface of the PC girder facing the first strong coupling members of the piers to be fastened to the first strong coupling members in a temporary construction step.

Description

Connection structure of composite rahmen bridge using steel brackets for fall prevention and composite rahmen bridge method using the same}

In the present invention, in the construction of a composite ramen bridge, steel brackets are provided on the lower surface of the PC girder and the upper surface of the pier facing each other, and are tightened through high-tension bolt joints, so that stable PC girders are secured during the construction phase. The present invention relates to a fastening structure of a composite ramen bridge using a steel bracket for preventing fall that can provide an excellent ramen structure against horizontal force during seismic resistance as well as preventing overturning, and a construction method of the composite ramen bridge using the same.

RC ramen bridges, which have been mainly applied for crossing small rivers, increase the stiffness of the entire structural system by connecting the upper structure and the lower structure of the bridge by rigid condensation, and at the same time reduce the size of the static moment due to the deflection occurring within the span. It is a structural type that is burdened by the pier connection.

In general, ramen bridges are not high in heights of bridges or bridges, and are economical to use for short-span bridges, and are often found in crossings of small rivers and lanes like in Korea. In particular, RC ramen bridges are a bridge construction method that possesses advantages in terms of maintenance as extension joints or bridge supports become unnecessary.

However, since the fixed load per unit area is large, it is difficult to plan long-distance (more than 15m) length and if the extension of the bridge is lengthened, the economic feasibility in terms of initial construction cost decreases due to the increase in the size of the right leg, heonchi and substructure.

In addition, since the formwork is formed using copper bars in all sections, there are limitations in workability and difficulty in quality control with cast-in-place concrete, and safety accidents due to installation of copper bars and formwork are frequently occurring in recent years, which is a problem in construction. Due to this problem, the RC ramen bridge has become less applicable, and as an alternative, a composite ramen bridge in the form of taking advantage of the girder bridge and RC ramen bridge has been developed.

The synthetic ramen construction method that combines the bottom plate and the right leg after mounting the girder on the aft can minimize the substructure located in the river by securing the span between the long ridges, and, unlike general joint girder bridges, bridge supports or bridges that require periodic replacement Since the expansion joint is excluded, it has advantages such as reduction of initial construction cost and maintenance cost, and improvement of drivability.

The synthetic ramen construction method developed in the early stages was developed as a steel composite ramen construction method using a steel girder and a steel composite ramen construction method using a PF girder introduced with pre-flexion, and is actively applied to a number of bridges.

The composite ramen structure developed to replace the existing RC ramen structure as a bridge type of long span and low height for securing water passage area is a method of unifying the upper and lower parts. It was developed as a steel structure system because there was no choice but to choose.

However, such a steel girder composite ramen construction method has various problems such as economic feasibility and construction difficulties, so the construction cost is lower than that of the steel composite ramen structure in the practical field, and the process of integrating the connection between the upper structure and the lower structure is easier. There has been an increasing demand for technology development to integrate the girder and the lower column wall.

In the ramen structure using such a precast girder, it is difficult to connect between members of the connecting portion and if sufficient performance is not exhibited, many problems may occur. Therefore, in order to apply the ramen method using the precast PSC girder, securing the safety of the connection is the most important.

Korean Patent Registration No. 10-1586320

Therefore, the object of the present invention is to provide a steel bracket on the lower surface of the PC girder and the upper surface of the pier, which face each other in constructing a composite ramen bridge, and secure it through high-tension bolt joints to ensure a stable PC girder at the temporary stage of the bridge construction. In addition to preventing the settling and overturning, the joint structure of the composite ramen bridge using steel brackets that can provide an excellent ramen structure against horizontal force during earthquake resistance by structurally integrated PC girders and the construction method of the composite ramen bridge using the same. To provide.

As a means for solving the above-described problems, the fastening structure of the composite ramen bridge using the steel bracket for preventing the fall of the present invention (hereinafter referred to as the'fastening structure of the present invention') includes a pair of spaced piers and the pair of piers What is claimed is: 1. A fastening structure of a composite ramen bridge for tightening right leg portions between PC girders placed on top, comprising: a first steel settlement material installed on an upper surface of the pier; And a second steel payment material installed on a lower surface of the PC girder facing the first steel payment material of the pier and mutually fastened with the first steel payment material during a construction process.

As an example, the first steel payment material is spaced apart so that a pair has a length relatively longer than the cross-sectional width of the PC girder, and a seating surface is provided from the upper surface of the pier toward the PC girder, and the second steel The payment is characterized in that a fastening surface is provided which is buried in the cross-sectional width direction of the PC girder and extends to face the first steel payment material at both ends thereof, and is placed in the first steel payment material.

As an example, the first steel payment material has an'I' shape consisting of an upper flange and a lower flange and a web connecting them, and a portion of the lower flange and the web is buried in the pier, and the upper flange is the It is characterized in that at least one first fastening hole is formed through the PC girder as it is exposed from the upper surface of the pier to provide a seating surface.

As an example, the first steel bond is formed through at least one of the webs buried inside the pier to allow at least one selected reinforcing bar to penetrate and bind to each of the reinforcing bars constituting the pier. It is characterized by further including a hole.

As an example, the first steel payment material is characterized in that it further comprises one or more first through-holes formed through the web embedded in the pier to allow the concrete constituting the pier to be synthesized.

As an example, the first steel payment material has a'I' shape consisting of an upper flange, a lower flange, and a web connecting them, and a plurality of shear connectors are mounted on the bottom of the lower flange to be embedded in the pier, and the upper The flange is exposed from the upper surface of the pier toward the PC girder to provide a seating surface, and at least one first binding hole is formed through.

As an example, the first fastening hole is characterized in that it is configured to have a long length in a direction perpendicular to the bridge shaft.

As an example, the upper flange is characterized in that the angle is selectively adjusted from the web in response to the inclination of the PC girder placed in the second steel payment material.

As an example, the second steel payment material has a'ㅗ' shape consisting of a horizontal plate and a vertical plate vertically connected to the upper surface of the horizontal plate along the length direction, and in the cross-sectional width direction of the PC girder. It is buried in the lower surface of the PC girder, and both ends are extended and exposed from the buried position to correspond to the separation distance between the pair of first steel fasteners, so that the fastening surfaces are provided on each horizontal plate and face each of the first fastening holes. It is characterized in that the second fastening hole is formed through the position.

As an example, the second steel payment material includes a plurality of reinforcing plates mounted to be perpendicular to the vertical plate along a predetermined interval on a horizontal plate embedded in the PC girder, and each reinforcing plate embedded in the PC girder. It is characterized in that it further comprises one or more second binding holes through which one or more stirrup reinforcements selected from among stirrup reinforcing bars constituting the PC girder are respectively penetrated and bonded in the same line.

As an example, the second steel payment material is characterized in that it further comprises one or more second through-holes formed through the vertical plate embedded in the PC girder so that the concrete constituting the PC girder is synthesized. .

As an example, the second fastening hole is characterized in that it is configured to have a long length in the orthogonal axis direction.

On the other hand, the construction method of the composite ramen bridge using the fastening structure of the composite ramen bridge using the steel bracket for fall prevention of the present invention (hereinafter referred to as the'construction method of the present invention') is: a) The first steel payment material described above is the upper surface of the pier Constructing to be provided in the; b) placing the PC girder provided on the lower surface of the second steel payment material so that the second steel payment material faces the first steel payment material; c) tightening the right leg portion between the pier and the PC girder by bolting the first steel payment material and the second steel payment material; And d) synthesizing a PC girder on the pier by pouring concrete on the upper part of the right leg portion and the PC girder stiffened in step c).

As described above, according to the fastening structure and construction method of the present invention, in the construction of the composite ramen bridge, steel brackets are provided on the lower surface of the PC girder and the upper surface of the pier facing each other, and tightened through high tension bolt joints. It is possible to prevent the PC girder from stabilizing and overturning even in the impact of the temporary installation stage or concrete placement for upper slab construction during bridge construction.

Accordingly, the right leg between the PC girder and the pier is tightened with only simplified bolting, improving the convenience of construction, as well as reducing the construction cost and speed of construction as it is not necessary to install an additional fall prevention device before the construction of the crossbeam or upper slab after installation. There is an effect that can be improved.

In addition, it is possible to support the horizontal force of the right leg due to external force through friction joint by fastening high tension bolts between the embedded steel bracket at the end of the PC girder and the steel bracket already installed on the upper side of the pier. As sufficient space is secured due to the bracket, it is easy to fill concrete and no interface occurs, and by structurally integrated PC girders, there is an effect that it is possible to provide a more excellent ramen structure against horizontal force during seismic resistance.

1 is a view showing a right leg between a PC girder and a pier according to the fastening structure of the present invention.
2 is a view showing the structure of a second steel payment according to an embodiment of the present invention.
Figure 3a is a view showing the structure of the first steel payment according to an embodiment of the present invention.
Figure 3b is a view showing the structure of the first steel payment according to another embodiment of the present invention.
4 is a view showing a mutual fastening structure of a first steel payment and a second steel payment according to an embodiment of the present invention.
5 is a view showing the slope of the upper flange of the first steel payment according to an embodiment of the present invention.
6A to 6D are views showing the construction method of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail based on the accompanying drawings. In describing the present invention, terms or words used in the present specification and claims are the present invention based on the principle that the inventor can appropriately define the concept of terms in order to explain his or her invention in the best way. It must be interpreted as a meaning and concept consistent with the technical idea of

The fastening structure of the present invention strengthens the right leg portion between a pair of spaced piers or alternations (hereinafter collectively referred to as'piers 10') and the PC girders 20 placed on the top of the pair of piers 10 In addition to preventing overturning in the hypothesis stage prior to the synthesis of the slab, it is possible to facilitate concrete filling by securing a sufficient space between the pier 10 and the PC girder 20.

Referring to Figure 1, the fastening structure of the present invention is a first steel payment 30 installed on the pier 10 and a second steel installed on the PC girder 20 corresponding to the first steel payment 30 It is configured to include the payment (40).

The first steel payment material 30 is installed on the upper surface of the pier 10 on which the PC girder 20 is seated, and a pair is spaced apart to have a length relatively longer than the cross-sectional width of the PC girder 20 A mounting surface is provided from the upper surface of the pier 10 toward the PC girder 20.

At this time, the cross-sectional width of the PC girder 20 refers to the width in the perpendicular direction of the bridge shaft.

The first steel payment material 30 is pre-formed on the upper surface of the pier 10 in the on-site manufacturing process of the pier 10, and as mentioned above, a seating surface is provided, so that the PC girder 20 is stable. Let the strength come together.

The second steel payment material 40 is installed on the lower surface of the PC girder 20 that faces the first steel payment material 30 of the pier 10, and is mutually fastened with the first steel payment material 30 during the construction process. do.

The second steel payment material 40 is buried in the cross-sectional width direction of the PC girder 20 so that it can be placed on the mounting surface of the first steel payment material 30, and faces the first steel payment material 30 at both ends. Each extending so as to be provided with a fastening surface to be placed in the first steel payment (30).

The first steel payment material 30 and the second steel payment material 40 are each formed with fastening holes at positions facing each other to be fastened through fastening means including high tension bolts 50, etc., so that the wind load before synthesis with the upper slab The PC girder 20 performs a fall prevention function so that the PC girder 20 does not rotate with respect to the throttle under external loads such as.

Hereinafter, embodiments of the first steel payment material 30 will be described with reference to FIGS. 3A and 3B.

First, the first steel payment material 30-1 according to an embodiment of the present invention may have a structure that is pre-construction during the on-site manufacturing process of the pier 10.

Referring to the first steel payment material 30-1 of this embodiment, as shown in FIG. 3A, the first steel payment material 30-1 includes an upper flange 300 and a lower flange 310, and a web connecting them. It may be a'I'-shaped steel material composed of (320).

In addition, in the first steel payment material 30-1, a portion of the lower flange 310 and the web 320 is embedded in the pier 10, and the upper flange 300 faces the PC girder 20. ), one or more first fastening holes 301 are formed therethrough while being exposed from the upper surface of the inner tooth surface to be provided.

Here, it is preferable that the first steel payment material 30-1 is configured to be able to move integrally with the pier 10 while fixing the position by being bound with the selected reinforcing bar during the reinforcement process of the reinforcing bar constituting the pier 10.

That is, the first steel settlement material 30-1 is disposed so that the web 320 buried in the pier 10 faces the axle direction, and at least one first binding hole 330 penetrates the web 320 It is formed, while constituting the pier 10, one or more selected of the reinforcement reinforcement bar 13 reinforced inside the bridge axis direction is to penetrate and bind, respectively.

In addition, in addition to the first binding hole 330 in the web 320 embedded in the pier 10, the first steel payment material 30-1 may further include at least one first through hole 340. Thus, in constructing the pier 10, the concrete to be poured can be easily synthesized through the first through hole 340.

Meanwhile, the first steel payment material 30-2 according to another embodiment of the present invention may be installed to be fixed at a corresponding position after removing a part of the upper surface after on-site manufacturing of the pier 10.

In the shape of the first steel payment material 30-2 of this embodiment with reference to FIG. 3B, the upper flange 300 and the lower flange 310 and connecting them are similar in shape to the first steel payment material 30-1 of the previous embodiment. A bar that may have an'I' shape composed of the web 320 is denoted by the same reference numerals in FIG. 3B and a detailed description thereof is omitted.

However, the first steel payment material 30-2 of the present embodiment is equipped with a plurality of shear connectors 350 protruding in a vertical direction from the bottom surface of the lower flange 310.

The shear connector 350 is a member for reinforcing adhesive strength when fixing the upper surface of the previously constructed pier 10, and is buried in an area from which a part of the upper surface of the pier 10 has been removed through an overcoat such as mortar. The first steel payment (30-2) is to be fixed.

In addition, in the first steel settlement material 30-2 of this embodiment, the shear connector 350 is mounted to be embedded in the upper surface of the pier 10, so that the upper flange 300 faces the PC girder 20 A seating surface may be provided by being exposed from the upper surface of (10), and at least one first binding hole 330 is formed through the exposed seating surface, that is, the upper flange 300.

Here, the shear connector 350 may be composed of a stud bolt that is commonly used as a shear key.

The first fastening hole 301 presented in the above two embodiments has a slit hole structure, so that it is possible to fasten bolts in response to errors between fastening holes flexibly.

At this time, the first fastening hole 301 is preferably configured to have a long length in the direction perpendicular to the bridge axis.

On the other hand, in the bridge design, when the longitudinal slope is large or a prestress is introduced into the PC girder 20, structurally, a deflection angle may occur due to the rotation of the end due to the rise occurring in the PC girder 20. , In the fastening structure of the present invention, the first steel plate 30 is the slope of the PC girder 20 in which the upper flange 300 is placed in the second steel plate 40 as shown in FIG. 5 In response to the web 320, it is preferable to be configured to enable selective angle adjustment.

For example, the upper flange 300 of the first steel payment material 30 is manufactured in a state in which the angle of the upper flange 300 is predetermined in response to a pre-designed longitudinal slope, or the PC girder 20 It may be to grasp the degree of rising of the PC girder 20 in the process of placing and adjust the angle by directly processing the upper flange 300 in the field.

In addition to the method of adjusting the angle of the upper flange 300, such an angle adjustment may smoothly fasten the joint of the high-tension bolt 50 of the right leg portion in the field by using a GAP PLATE.

Meanwhile, as shown in FIG. 2, the second steel payment material 40 according to an embodiment of the present invention is vertically connected to the horizontal plate 400 and the upper surface of the horizontal plate 400 in the longitudinal direction. It may be a'ㅗ' shaped steel made of a direct plate 410.

And the second steel payment material 40 is buried in the lower surface of the PC girder 20 in the cross-sectional width direction of the PC girder 20, the two ends corresponding to the separation distance between the pair of first steel payment materials 30 Each can be extended and exposed from the buried position, and a second fastening hole 401 penetrates at a position facing each of the first fastening hole 301 while a fastening surface is provided on the horizontal plate 400 exposed at both ends. Is formed.

In addition, the second steel payment material 40 further includes a plurality of reinforcing plates 420 mounted perpendicularly to the vertical plate 410 along a predetermined interval on the horizontal plate 400 buried in the PC girder 20 Included, such a reinforcing plate 420 is resistant to the rotational moment of the PC girder 20 along with the function as a shear key that enables the second steel payment material 40 to be integrated with the concrete constituting the PC girder 20 It functions as a reinforcing material.

Here, the second steel payment material 40 is preferably configured to be firmly embedded in the PC girder 20 by binding with the shear reinforcing bar selected in the reinforcing process of the reinforcing bar constituting the PC girder 20.

That is, the second steel payment material 40 is a plurality of reinforcing plates 420 buried in the PC girder 20 as shown in FIG. 2 are disposed in a direction perpendicular to the bridge shaft, and each reinforcing plate 420 In the same line, at least one second binding hole 430 is formed through, forming the PC girder 20, and at least one shear reinforcing bar 22 selected from among shear reinforcing bars 22 that are laid inside in a perpendicular direction of the bridge shaft. Each of these is to penetrate and bind.

At this time, the shear reinforcement of the PC girder 20 may be a stirrup reinforcement.

In addition to the second binding hole 430, the second steel payment material 40 may further include at least one second through hole 440 in the vertical plate 410 buried in the PC girder 20. Thus, in configuring the PC girder 20, the concrete to be poured may be easily synthesized through the second through hole 440.

In addition, the second fastening hole 401 of the second steel fastening material 40 also has a slit hole structure, so that the bolt can be fastened flexibly to the error between fastening holes. At this time, the second fastening hole 401 is 1 It is configured to have a long length in the direction perpendicular to the fastening hole 301, that is, in the cross-axis direction, and is connected with the first steel fastener 30 having a slit hole structure so that the fastening range can be further expanded left and right and up and down. .

As described above, according to the fastening structure of the present invention, in the composite ramen bridge, it is possible to stably hypothesize by the load of the initial PC girder 20 at the right leg portion between the PC girder 20 and the pier 10, and the PC girder 20 ) To be placed more easily to simplify the work type, but by structurally uniting the PC girders (20) to each other, it is possible to prevent the position change due to the impact of concrete placement caused by the upper slab construction, so it is more effective and economically synthesized. Ramen bridge can be strengthened and constructed.

Hereinafter, a construction method of the present invention will be described with reference to FIGS. 6A to 6D.

First, a step of constructing the first steel payment material 30 described above is provided on the upper surface of the pier 10.

In this process, as described in the fastening structure of the present invention, the installation of the first steel payment material 30 is either installed together during the construction process of the pier 10, or is installed to be settled on the upper surface after the construction of the pier 10 It can be any one of being.

In addition, in a general composite ramen bridge, the right leg between the pier 10 and the PC girder 20 is stiffened, and then the upper slab, heonchi, and wall are constructed through reinforcement of reinforcing bars and concrete pouring. During the construction process, the steel-gathered reinforcing bar 12 connected by a coupler, etc. from the internal reinforcing bar together with the exposure of the plurality of horizontal shearing reinforcing bars 11 is constructed so that it protrudes from the upper surface so that it can be integrated with the PC girder 20 through concrete pouring in the future. do.

Here, not only the piers 10 but also the PC girders 20 are pre-installed so that a plurality of horizontal shearing reinforcing bars 21 are exposed on the upper surface thereof, so that the adhesive force according to concrete pouring can act the same as the piers 10. do.

And as shown in Fig. 6b, the second steel payment material 40 faces the PC girder 20 provided through pre-production on the lower surface of the first steel payment material 30 and the second steel payment material 40 Then, as shown in Fig. 6c, the first steel payment material 30 and the second steel payment material 40 are fastened through a high-tension bolt 50, and the pier 10 and the PC By performing the step of tightening the right leg portions between the girders 20, conduction due to external force can be prevented during the construction process of the composite ramen bridge.

Finally, a step of synthesizing the PC girder 20 to the pier 10 by pouring concrete on the upper part of the hardened right leg and the PC girder 20 is performed.

In this process, the construction of the formwork and the reinforcement and connection of reinforcing bars are required before the concrete is poured, and since this can be variously performed through known techniques, a detailed description will be omitted.

However, as described above, the pier 10 is constructed so that the steel-gathered reinforcing bar 12 connected by a coupler or the like from the internal reinforcing bar protrudes from the inner reinforcing bar during the manufacturing process, and it is bent to the top of the PC girder 20 It is natural that the PC girder 20 and the pier 10 can be constructed to be mutually rigid by the slab concrete poured on the upper part of the girder 20 and the upper part of the pier 10.

It will be appreciated by those skilled in the art through the above description that various changes and modifications can be made without departing from the technical idea of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be determined by the claims.

10: pier (alternation) 20: PC girder
30: 1st strong payment 40: 2nd strong approval
50: high tension bolt

Claims (13)

In the fastening structure of a composite ramen bridge for tightening a right leg portion between a pair of spaced piers and a PC girder placed on the top of the pair of piers,
A first steel payment material that is spaced apart so that a pair has a length relatively longer than the cross-sectional width of the PC girder, and is partially embedded in the pier to provide a seating surface from the upper surface of the pier toward the PC girder; And
The PC girder is buried in the cross-sectional width direction and extended to face the first steel payment material at both ends, and is installed to provide a fastening surface placed on the first steel payment material, and is mutually fastened with the first steel payment material during the construction process. 2 strong approval; including,
The first strong payment,
It has an'I' shape consisting of an upper flange, a lower flange, and a web connecting them, and the upper flange is exposed from the upper surface of the pier toward the PC girder to provide a seating surface to form one or more first fastening holes through. And
The second strong payment,
It has a'ㅗ' shape consisting of a horizontal plate and a vertical plate vertically connected in the longitudinal direction to the upper surface of the horizontal plate, and is buried in the lower surface of the PC girder in the cross-sectional width direction of the PC girder. In response to the separation distance between the first steel fasteners, both ends are respectively extended and exposed from the buried position to provide a fastening surface on each horizontal plate, and a second fastening hole is formed through each of the positions facing the first fastening hole,
A plurality of reinforcing plates mounted to be perpendicular to the vertical plate at regular intervals on a horizontal plate buried inside the PC girder, and at least one second binding hole in the same line in each reinforcing plate buried in the PC girder One or more stirrup reinforcing bars selected from among stirrup reinforcing bars that are formed through and reinforced in a direction perpendicular to the bridge shaft to constitute the PC girder are respectively penetrated and bound through the second binding holes,
A steel bracket for fall prevention, characterized in that at least one second through hole is formed through the vertical plate buried in the inside of the PC girder so that the concrete to be poured in the PC girder is synthesized through the second through hole The fastening structure of the composite ramen bridge using
delete The method of claim 1,
The first strong payment,
Part of the lower flange and the web are buried in the pier, and the upper flange is exposed from the upper surface of the pier toward the PC girder to provide a seating surface, and at least one first fastening hole is formed through it. The fastening structure of a composite ramen bridge using a steel bracket.
The method of claim 3,
The first strong payment,
The steel material for fall prevention, characterized in that it further comprises at least one first binding hole formed through at least one of the webs buried in the pier to allow at least one selected reinforcing bar to pass through and bind each of the reinforcing bars constituting the pier Synthetic ramen bridge fastening structure using brackets.
The method of claim 3,
The first strong payment,
The fastening structure of a composite ramen bridge using a steel bracket for fall prevention, characterized in that it further comprises at least one first through hole formed through the web buried in the pier to allow the concrete constituting the pier to be synthesized.
The method of claim 1,
The first strong payment,
A plurality of shear connectors are provided on the bottom of the lower flange and mounted to be embedded in the pier through the shear connector, and the upper flange is exposed from the upper surface of the pier toward the PC girder to provide a seating surface. A fastening structure of a composite ramen bridge using a steel bracket for preventing fall, characterized in that a binding hole is formed through it.
The method of claim 1,
The first fastening hole,
A fastening structure of a composite ramen bridge using a steel bracket for preventing fall, characterized in that it is configured to have a long length in a direction perpendicular to the bridge shaft.
The method of claim 1,
The upper flange,
The fastening structure of a composite ramen bridge using a steel bracket for fall prevention, characterized in that the angle from the web is selectively adjusted in response to the inclination of the PC girder placed in the second steel payment material.
delete delete delete The method of claim 1,
The second fastening hole,
A fastening structure of a composite ramen bridge using a steel bracket for preventing fall, characterized in that it is configured to have a long length in the throttling direction.
a) constructing the first steel payment material of any one of claims 1, 3 to 8, and 12 to be provided on the upper surface of the pier;
b) placing the PC girder provided on the lower surface of the second steel approval according to any one of items 1, 3 to 8, and 12 so that the second steel payment material faces the first steel payment material. ;
c) tightening the right leg portion between the pier and the PC girder by bolting the first steel payment material and the second steel payment material; And
d) the step of synthesizing a PC girder on the pier by pouring concrete on the right leg portion and the PC girder strengthened in step c), and the fastening structure of the composite ramen bridge using a steel bracket for fall prevention, comprising: Synthetic ramen bridge method using

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