KR100724999B1 - Composite girder with steel truss web and connection structure thereof - Google Patents

Abstract

A composite belly trust girder with an allowable displacement connection structure due to a slip plate and a panel point connection structure thereof are provided to improve a field assembling property of upper and lower flanges and a diagonal member by burying the diagonal member in the upper and lower flanges in the field. A composite belly trust girder includes a belly. The belly is formed in a truss structure of a diagonal member(1). The diagonal member includes an upper flange, a lower flange, and a steel material. Slit plates(2) are formed at a connection end of the belly. A slit(3) is formed in the slip plate. Before the connection end of the belly is buried in the upper flange or the lower flange, the slit plates are disposed to be overlapped with each other. In a state that a horizontal movement and a connection angle between the bellies are adjusted, the diagonal member is connected by a coupling member(4), which penetrates the slit.

Description

Composite girder with steel truss web and connection structure

1 is a schematic perspective view of a bridge constructed using a conventional abdominal truss composite girder.

FIG. 2A is a schematic partial side view showing a connection structure at a gap point where sand material is coupled to a lower flange in a conventional abdominal truss composite girder; FIG.

FIG. 2B is a cross-sectional view taken along the line C-C of FIG. 2A.

Figure 3 is a schematic perspective view showing a state in which the sand material is arranged in the truss structure in the state of assembling the reinforcing bars forming the upper and lower flanges to manufacture the abdominal truss composite girder according to the present invention.

4 is a partial perspective view showing in detail that the yarn is connected by the slit plate in the circle B portion of FIG.

5 is a schematic side view of an abdominal truss composite girder in accordance with the present invention.

<Description of the symbols for the main parts of the drawings>

1 company

2 slit board

3 slits

The present invention relates to an abdominal truss composite girder and its junction structure, specifically, the upper flange and the lower flange is made of concrete, and the abdominal truss composite girder having a truss structure of sand yarn composed of steel, made of steel In forming the point connection structure where the yarn and the upper and lower flanges are coupled, the slit plate is used to allow horizontal displacement between the yarns, and is then completely fixed at the site and embedded in the upper and lower flanges. The present invention relates to an abdominal truss composite girder and its junction structure having a new type of junction structure that can improve the field assembly of the upper and lower flanges and achieve a rigid connection structure.

In the conventional reinforced concrete girder or prestressed concrete girder, the abdomen between the upper and lower flanges has a problem in that it is actually designed to be unnecessarily large compared to its structural necessity. In order to solve these disadvantages, an abdominal truss composite girder has been proposed in which the concrete abdomen is replaced with a truss structure made of steel sand, and such an abdominal truss composite girder has attracted attention as a bridge girder with a stop. Are receiving.

Figure 1 is a schematic perspective view of a bridge using an abdominal truss composite girder, as described above, the abdominal truss composite girder 100 is the abdomen between the upper flange 101 and the lower flange 102 is made of steel ( 103) is made of a truss structure. Therefore, in such an abdominal truss composite girder, it is very important how to configure the connection structure at the junction where the material 103 and the upper flange 101 or the lower flange 102 are coupled.

FIG. 2A is a schematic partial side view showing a connection structure of a gap point where a yarn 103 is coupled to a lower flange 102 in a conventional abdominal truss composite girder, and FIG. 2B is a cross-sectional view taken along the line C-C of FIG. 2A.

Conventionally, the connection structure of the steel form using the gusset plate 110 and the shear stud 120 is used as a connection structure between the yarn 103 at the gap point, as shown in the figure, both sides of the yarn is inclinedly arranged 103 is connected to the gusset plate 110 by bolt coupling at the end of each of the junctions, thereby being connected to each other in the form of steel.

As described above, in the conventional abdominal truss composite girder, the yarn 103 is rotated or vertical or horizontal with respect to the gusset plate 110 before the abdomen having a truss structure is engaged with the upper and lower flanges 101 and 102. It is combined in the form of steel that cannot be displaced. In the connection structure of such steel, the following inconveniences in construction occur.

When connecting the cut material 103 cut in advance to the gusset plate 110, the inclination of the slope of the end of the material 103 is often not coincident with the bolt coupling hole formed in the gusset plate 110, in this case It is impossible to bolt the end of the yarn material 103 and the gusset plate 110 in the field itself.

In addition, the plurality of yarn 103 is connected to the gusset plate 110 in advance to make the abdomen in the form of a unit of a predetermined length to transfer to the site, in the field to assemble a plurality of abdominal units in the longitudinal direction suitable for the entire bridge area In the case of forming the abdominal unit, the stress is concentrated in the joint portion of the yarn material 103 and gusset plate 110 in the process of transporting the abdominal unit manufactured in the factory, the previously bonded material material 103 and gusset plate ( Since the steel connection of the 110 is broken, it often occurs when the gusset plate 110 needs to be repaired, bolted, or changed in a welding manner.

In addition, the end of the yarn material 103 may be combined with the gusset plate 110 by welding. In this case, the welding work in the field is not only a cumbersome work that is costly and laborious, but also requires welding work in the air due to the nature of the bridge. This is a very dangerous task. In addition, such welding work in the field also has a problem that causes thermal deformation in the yarn material 103.

On the other hand, in the above-described conventional techniques, the gusset plate 110 is sheared integrally with the upper and lower flanges (101, 102) in a state in which both sides of the yarn 103 is connected by the gusset plate 110 in the form of a steel ( The abdomen of the truss structure made by 103 is combined with the upper and lower flanges 101 and 102 to form an integral part. For this shear connection, the shear stud 120 is installed on the outer surface of the gusset plate 110 so that the gusset plate 110 is sheared integrally with the concrete of the upper and lower flanges 101 and 102.

In general, the reinforcing bars 130 are densely arranged in the upper and lower flanges 101 and 102. When the gusset plate 110 is sheared to the upper and lower flanges 101 and 102 using the shear stud 120, the reinforcing bars 130 are densely arranged. Shear studs 120 are inserted between the reinforcing bars 130 of the upper and lower flanges 101 and 102 which are woven. Therefore, when the concrete is poured to manufacture the upper and lower flanges (101, 102), in the position where the shear stud 120 is present between the reinforcing bar 130 and the reinforcing bar 130 and the shear stud 120 and the reinforcing bar There is a problem that the concrete is not properly filled between (130).

Eventually, to prevent such a problem, only the part where gusset plate 110 is installed can be used to use high-flow concrete or non-shrink mortar separately. For this purpose, block out only the part or double the concrete placing work. As a result, workability is extremely degraded.

On the other hand, in the abdominal truss composite girder, one of the yarns 103 of the two yarns 103 connected to each other to support the tensile force and the other yarns 103 to support the compressive force. Therefore, only some of the shear studs 120 installed on the contact surfaces of the gusset plate 110 and the upper and lower flanges 101 and 102 connected in a steel form also function as shear connectors. That is, in the prior art in which the shear stud 120 is installed for the connection between the gusset plate 110 and the upper or lower flanges 101 and 102, only a part of the shear stud 120 is fully functional, and the other portion is dead. There is a structural limitation that only inefficient structural performance is exhibited.

In addition, the prior art as described above, because a plurality of steel parts such as the shear stud 120, gusset plate 110 is used has a disadvantage that the material cost is further increased.

The present invention has been developed in order to solve the problems of the prior art as described above, because the connection structure in the form of a steel form between the yarn by the gusset plate at the junction where the yarn and the upper or lower flange of the abdominal truss composite girder is coupled The purpose of the present invention is to prevent workability degradation during on-site assembly and to solve the problems of thermal deformation, workability reduction, construction cost increase, and air increase due to on-site welding.

In addition, the present invention is a problem in that the gusset plate and the upper or lower flange is coupled by the shear stud in the prior art, that is, to use the high flow concrete or non-shrink mortar to block out or double-pour the portion and , Was developed to solve the problem that the function of the shear stud as a shear connector is impaired.

In addition, the present invention has been developed to solve the problem that the structural limitations of the prior art by the shear stud, that is to function as a shear connector is part of the shear stud and the rest is dead.

In the present invention, in order to achieve the above object, an abdominal truss composite girder having an abdomen formed by a truss structure of yarn material consisting of an upper flange, a lower flange and a steel material, the yarns are connected to each other at their ends to the upper flange or the lower flange Directly buried and joined; A slit plate having a slit in the transverse direction is provided at the connecting end of the yarn; At the junction where the yarn is directly embedded in the upper flange or the lower flange, the slit plate provided at the connection end of the yarn overlaps with each other in a state before the connecting end of the yarn is embedded in the upper flange or the lower flange. An abdominal truss composite girder is disposed and has a structure connected by a fastening member penetrating through the slit in a state in which horizontal movement between the yarn and the connection angle are adjustable.

In addition, in the present invention, in the abdominal truss composite girder having the abdomen formed by the truss structure of the yarn consisting of the upper flange, the lower flange and the steel material, the yarn connected to each other at its end is connected to the upper flange or the lower flange as a connection structure Before connecting with the upper flange or the lower flange, the connecting end between the yarn, the slit plate provided on the connecting end of the yarn is arranged to overlap each other through the slit in a state that can be adjusted horizontal movement and connection angle between the yarn Is connected by a fastening member to the; The connecting ends of the yarns connected to each other by the slit plate are directly buried in the concrete of the upper flange or the lower flange at the junction and coupled to the upper flange or the lower flange, thereby providing a junction structure of the abdominal truss composite girder. .

In the present invention as described above, the slit plate is attached to the band-shaped band member; The slit plate may be integrally installed on the yarn by fixing the band member in the form of winding the connecting end of the yarn.

Hereinafter, with reference to the accompanying drawings will be described the configuration and effect of the abdominal truss composite girder according to an embodiment of the present invention.

3 is a state in which the yarn 1 is arranged in a truss structure in the state of assembling the reinforcing bar 130 forming the upper and lower flanges 101 and 102 to fabricate the abdominal truss composite girder according to the present invention. A schematic perspective view is shown, and FIG. 4 is a partial perspective view showing only a connecting end of the yarn 1 in an enlarged manner to show a structure in which the yarn 1 is connected by the slit plate 2, and FIG. 5 is a schematic side view of an abdominal truss composite girder according to the present invention.

The abdominal truss composite girder according to the present invention is also a truss structure of the yarn 1 made of steel material in the abdomen between the upper flange 101 and the lower flange 102, but unlike the prior art, the yarn 1 and the upper flange ( 101 or at the junction where the lower flange 102 is coupled, the yarn 1 is connected in a form capable of horizontal and angle adjustment by the slit plate (2). As shown in Fig. 4 showing an embodiment of the present invention, the slit plate 2 in which the slits 3 in the transverse direction are formed at each end of the yarn 1 is integrally coupled. In the state in which the slit plate 2 of the both side yarns 1 overlap, the fastening member 4 such as a bolt is fastened through the slit 3 so that both side yarns 1 are integrally connected to each other.

The abdominal truss composite girder according to the present invention also after the abdominal unit of a predetermined length in the form of a truss structure by the yarn (1), these abdominal units are transported to the field and connected to each other, the upper and lower parts of the connected abdominal unit The concrete is poured into the upper and lower flanges 101 and 102, respectively, to be integrally installed.

In the present invention, the yarn 1 has a connection structure by the slit plate 2 at the gap point in the state before the abdominal part of the truss is joined with the upper and lower flanges 101 and 102, and thus the yarn 1 It is very easy to connect by adjusting the angle of each other.

Specifically, in the state in which the yarn 1 of the abdominal unit to be connected to each other so that the slit plate 2 is overlapped with each other in the field, the horizontal member or the angle of the two side yarns 1 are adjusted, the fastening member 4 To firmly secure the connection position of the both sides of the yarn 1, so that the connecting end of the yarn 1, including the slit plate 2 is completely embedded in the concrete of the upper or lower flanges (101, 102) The upper or lower flanges 101 and 102 will be constructed.

In the conventional case, since the yarn 1 has a connection structure in the form of a steel, when the angles of the yarn 1 in both abdominal units do not coincide with each other, it is very difficult to connect them in the field. Since the plate 2 is capable of adjusting the horizontal movement and the connection angle between the yarn 1, there is an advantage that the field connection of both sides 1 can be easily made.

In particular, in the above connection structure, since no welding work is required on site, the workability can be improved accordingly, and the effect of preventing thermal deformation of the material 1 by welding can also be exerted. do.

On the other hand, the connection structure of the yarn material 1 by the slit 3 to which the fastening member 4 is fastened is also very easy to connect with the upper and lower flanges (101, 102). As shown in FIG. 3, the connecting end of the yarn 1 connected by the slit plate 2 is installed between the reinforcing bars 130 forming the upper and lower flanges 101 and 102. Unlike the prior art using the stud 120, a sufficient space for the concrete to be introduced into the connection portion between the reinforcing bar 130 and the sand material (1). Therefore, when placing concrete to manufacture the upper and lower flanges (101, 102), it is possible to easily fill the gap between the stock material (1) and the upper and lower flanges (101, 102), not even high-flow concrete. Therefore, as in the prior art, it is not necessary to perform cumbersome work such as block-out and double-pouring of concrete according to the use of high-flow concrete, and it is possible to improve the workability as well as to reduce the construction cost and shorten the air. It is also possible to achieve a firm shear connection and integral coupling between the upper and lower flanges 101, 102 and the yarn 1 without loss of the function of the shear connection member at the junction.

The configuration of coupling the slit plate 2 to the connecting end of the yarn 1 may be attached to the slit plate 2 directly to the side of the yarn 1 in the factory, as in the embodiment shown in the figure, the belt shape The slit plate 2 may be integrally installed on the yarn 1 by attaching the slit plate 2 to the band member 5 of the band member 5 and winding the band member 5 around the connecting end of the yarn 1. have.

In particular, the band member (5) once the band member (5) by installing the fastening member (4) through the slit (3) in the state before the yarn 1 is integrally engaged with the upper or lower flanges (101, 102) The joints are peeled off or not moved at the connecting end of the head), and the connection between the yarns 1 constituting the abdominal unit is completed so that the position between the yarns 1 is completely defined, that is, the upper or lower flange 101 The slit plate 2 is firmly connected to the connecting end of the building material 1 by completely binding the fastening member 4 in a state immediately before the connecting end of the building material 1 is disposed between the reinforcing bars 130 of 102. It is enough to make sure it is fixed. In such a configuration, there is an advantage that the welding work in the factory does not have to be performed for the installation of the slit plate 2.

On the other hand, the slit plate (2) may be provided on each side of the yarn (1) one by one so as to overlap one another, but, as shown in the illustrated embodiment, the slit plate (2) provided on one side of the yarn 1 is 2 It may be formed in the middle, and may be configured such that the slit plate 2 provided in the other yarn 1 is inserted between the slit plate 2 formed in the double.

As described above, in the abdominal truss composite girder according to the present invention, both sides of the slit plate is coupled by a fastening member in a state where the slit plates in which the slit in the transverse direction is formed are overlapped with each other at the junction where the yarn and the upper or lower flange are coupled. As a result, the horizontal end and the angle adjustment between the two yarns are connected so that the connecting end of the yarns is embedded in the concrete of the upper or lower flange.

The horizontal movement and the angle adjustment are possible before the connecting end of the sand material is embedded in the concrete of the upper or lower flange. Therefore, when the sand material of both sides is joined to connect the truss abdominal unit to each other in the field, the angle of the sand material is adjusted. By adjusting, the material of the neighboring abdominal unit can be easily connected in the field.

In addition, when the materials are connected to each other in the field, troublesome on-site welding work is not necessary, so that the thermal deformation of the material can be prevented, the work risk is reduced, the field work is simplified, the cost is reduced, and the air is shortened.

In addition, it is possible to secure sufficient space for the concrete to be filled between the sand stock and the rebar of the upper or lower flange at the gap point, thereby eliminating various difficulties of the prior art when placing the upper and lower flange concrete. There is this.

In the above described the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited to this, it is possible to be freely modified according to the technical idea of the present invention.

Claims (4)

An abdominal truss composite girder having an abdomen formed of a truss structure of an upper flange 101, a lower flange 102, and a yarn 1 made of steel, The yarn 1 is connected to the end of the other yarn 1 by being embedded directly in the upper flange 101 or the lower flange 102 and joined; The slit plate 2 in which the slit 3 of the horizontal direction is formed in the connection end part of the said yarn 1 is provided, respectively; At the junction where the yarn 1 is embedded directly in the upper flange 101 or the lower flange 102, the connecting end of the yarn 1 is embedded in the upper flange 101 or the lower flange 102. In the state before the slit plate (2) provided on the connecting end of the yarn 1 is disposed so as to overlap with each other through the slit (3) in a state capable of adjusting the horizontal movement and the connection angle between the yarn 1 Abdominal truss composite girder, characterized in that having a structure connected by a fastening member (4). The method of claim 1, The slit plate (2) is attached to a band-shaped band member (5); Abdominal truss composite girder, characterized in that the slit plate (2) is integrally installed on the yarn (1) by the band member (5) is fixed in the form wound around the connecting end of the yarn (1). In the abdominal truss composite girder having an abdomen formed in the truss structure of the upper flange 101, the lower flange 102 and the yarn 1 made of steel, the yarns 1 connected to each other at their ends are the upper flange 101 or As a connection structure of the gap point coupled with the lower flange 102, Before joining the upper flange 101 or the lower flange 102, the connecting end between the yarn 1, the slit plate 2 provided on the connecting end of the yarn 1 is arranged so that the yarn overlaps with each other (1) is connected by a fastening member (4) penetrating the slit (3) in a state capable of adjusting the horizontal movement and the connection angle therebetween; The connecting end portions of the yarn material 1 connected to each other by the slit plate 2 are directly embedded in the concrete of the upper flange 101 or the lower flange 102 at the junctions, so that the upper flange 101 or the lower flange 102 A junction structure of the abdominal truss composite girder, characterized in that it is coupled. The method of claim 3, The slit plate (2) is attached to a band-shaped band member (5); The band member 5 is fixed in a form in which the connecting end of the yarn 1 is wound, so that the slit plate 2 is integrally installed on the yarn 1, wherein the gap point connection structure of the abdominal truss composite girder is provided. .

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