KR20130067027A - Composite girder with steel pipe and rahmen bridge construction method using the same - Google Patents

Abstract

PURPOSE: A composite girder using a vertical steel pipe as a web member and a rahmen bridge construction method using the same are provided to economically construct a bridge by being structurally efficient and facilitating an assembly. CONSTITUTION: A composite girder using a vertical steel pipe as a web member comprises a concrete lower chord(100), both end lower supports(120a), an inner lower support(120b), and a web member(200). The both end lower supports are embedded into both ends of the concrete lower chord and comprise a support plate(121a) and a web member setting plate(123a). The web member comprises a vertical steel pipe(210) and an upper support(220). The vertical steel pipe is inserted into the both end lower supports through the concrete lower chord. The vertical steel pipe is held in the lower structure of a bridge for penetrating a fixing member. The fixing member is strongly fixed to the upper surface of the composite girder.

Description

Composite girders using vertical steel pipes as a cladding member and construction method for ramen bridges using them {COMPOSITE GIRDER WITH STEEL PIPE AND RAHMEN BRIDGE CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a composite girder using a vertical steel pipe as a covering member and a method for constructing a ramen bridge using the same. More specifically, the present invention relates to a composite girder using a vertical steel pipe as a composite member and a bridge construction method using the same, which are easy to assemble and have excellent structural efficiency, and thus can be economically installed.

Conventional prestressed composite truss beam 10 is a phase current 11 of a predetermined shape made of a structural steel plate (steel), and a member 12 made of a rolled steel or steel pipe, and a concrete cross section of a predetermined shape as shown in Figure 1a Each of the lower chords 14 into which prestresses are introduced using the PS steel wire 13 is formed.

The phase chord 11 receives a compressive force or a tensile force due to the self-weight of the composite truss beam 10 and the load of the concrete base plate 15. The phase chord made of steel is strong in tensile force but relatively weak in compressive force. Due to the characteristics of the bed, the amount of steel present in the phase current increases as the compressive force acting or the wider the area subjected to the compressive force increases.

In addition, the composite member 12 and the lower chord 14 of the composite truss 10 purchase the horizontal connecting steel plate 16 made of steel on the upper surface of the lower chord, and then the horizontal connecting steel sheet using welding or high-tension bolts. It has the structure which couple | bonds 16 with the abdominal member 12. As shown in FIG.

Therefore, a plurality of studs 17 are formed on the lower surface of the horizontal connecting steel sheet to secure the unitary action with the lower chord 14. The heat generated during welding causes bending deformation in the horizontal connecting steel sheet 16 to maintain a flat state. There was a problem that was difficult to do. When such bending deformation occurs, the depth embedded in the concrete lower chord 14 is not constant, which causes a problem that it is difficult to waterproof the horizontal connection steel sheet and the lower current contact surface 18.

Looking at the composite truss introduced to solve the problems of the conventional synthetic truss 10 with reference to Figure 1b as follows.

That is, the upper chord 30 of the composite truss girder is formed of a composite structure consisting of the horizontal steel plate 31 and the concrete 32, and then the shear reinforcing bars 34 are disposed to be combined with the bottom plate concrete 33.

Accordingly, by reinforcing the steel phase current 31 in the region subjected to the compression to the concrete 32, which is resistant to compression and has a low material cost, the amount of steel required for the phased steel is greatly reduced, and the horizontal steel sheet 31 constituting the phase current 30 is formed. In order to secure the unitary action between the concrete and the 32 to be provided with a stud (35) on the upper surface of the horizontal steel sheet.

FIG. 1C illustrates a configuration of a gap structure for connecting the abdomen 61 and the concrete lower chord 64 when using a steel pipe as the abdomen of the composite truss 30. After installing the gusset plate 62 having a predetermined size at the end of the ash 61, the gusset plate 62 is connected to each other using the vertical connecting plate 63, and then the concrete lower chord 64 to a certain depth. And a plurality of holes 65 of a predetermined size are provided in the gusset plate 62 and the vertical connecting plate 63 of the buried portion in order to harden the lower chord 64. The reinforcement of the concrete lower chord 64 is to pass through the abdominal member 61 and the concrete lower chord 64 is a steel pipe to be integrated with each other.

Thus, by removing the horizontal connecting plate 16 and the studs 17 placed on the upper surface of the lower chord 14 as shown in Figure 1a, to solve the construction problems due to the deformation of the horizontal connecting steel plate 16 caused by the installation of the studs 17 I would have to.

However, the method of embedding the abdominal member 61 in the concrete lower chord 64 requires accurate setting of the abdominal member 61, and the reinforcing bar of the concrete lower chord 61 is connected to the hole 65 of the vertical connecting plate 64. ), There is a limit that it is not possible to manufacture concrete undercarriage by assembly method.

Figure 1d shows an example of a conventional ramen bridge construction method, it can be seen that an example of installing a fixing member 90, such as a reinforcing bar assembly to stiffen the corrugated girders 70 to the lower bridge structure (80).

However, the method of inserting the fixing member 90 into the corrugated girders 70 in this manner requires a large number of holes into which the fixing member 90 is inserted into the corrugated girders 70, thereby inevitably deteriorating the construction. There was a problem.

Accordingly, the present invention simplifies the manufacturing process as much as possible in the production of composite girder (synthetic beam, composite beam), as well as very easy to assemble and fabricate concrete inside the abdominal member to enable stable phase current support and buckling. Synthetic girder can be fabricated structurally and economically in an advantageous way, and it is possible to manufacture composite girder using a concrete-filled composite member that can more easily combine the composite girder and the alternating portion in the rigid section of the ramen bridge and the construction of the ramen bridge using the same. It's about how.

According to an aspect of the present invention,

First, in order to reduce weight, the upper and lower portions of the composite girder are formed as concrete upper and lower chords, respectively.

The concrete upper chord and the lower chord are manufactured in the form of a rectangular parallelepiped concrete plate, and the tension lowering material is installed inside the concrete lower chord so that prestress is introduced into the composite girder.

These concrete upper and lower chords can be manufactured in factories using bridge formwork, which is usually used, so it is not necessary to use highly skilled techniques for the production, and it is easy to control the quality of the concrete upper and lower chords. Done.

Second, these concrete upper and lower chords are assembled to each other by a vertical steel pipe that is prefabricated in a prefabricated manner.

To this end, the lower butt is installed in the concrete lower chord, but the abdominal member setting plate is installed in the lower butt so that the vertical steel pipe can be easily installed in the concrete lower chord.

The concrete upper chord is installed in the upper support material, but the upper support is also installed in the abdominal member setting plate so that it is possible to simply install the upper support on the top of the vertical steel pipe.

Thus, simply by fixing the vertical steel pipe to the upper and lower pedestals so that the composite girder fabrication can be completed.

Third, since the vertical steel pipe is used by cutting the ready-made steel pipe to a predetermined length, if the manufacturing and installation becomes very simple, the structurally effective concrete member is formed by filling the interior when the concrete is placed to form the concrete phase current inside. It was done.

That is, the vertical steel pipe itself is part of the load bearing area, but the concrete constrained by the vertical steel pipe therein can support the working load more effectively.

Fourth, in the steel part of the ramen bridge, the lower part of the vertical steel pipe is installed to penetrate the concrete lower chord, and the fixing member (multiple rebar bundles) installed at the alternating bridge of the ramen bridge is finally penetrated through the vertical steel pipe to form the concrete image of the composite girder. By tightening and fixing on the upper surface, the construction of the steel part of the ramen bridge can be improved.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Thus, the composite girder according to the present invention

It is simple to manufacture by using concrete upper and lower chords and vertical steel pipes and upper support, so it is very quick to manufacture and efficient use of steel formwork, which is costly for manufacturing, makes more economical composite girder production. It becomes possible.

In addition, since the composite girder can be manufactured by the precast method, it is very easy to control the quality and thus can be used for effective bridge construction.

In addition, in the construction of the steel ramen bridge, the composite girders can be easily hardened to the shift, thus enabling more efficient and economical construction of the ramen bridge.

Figure 1a, 1b and 1c is a perspective view of the point structure of the conventional composite truss beam, composite truss beam and composite truss beam,
Figure 2a, Figure 2b and Figure 2c is a manufacturing flow chart of the composite girder using a vertical steel pipe according to the present invention as a covering member,
Figure 3 is a perspective view of the connection of the steel joint of the composite girder using a vertical steel pipe according to the present invention,
4a and 4b is a flow chart of the bridge construction method using a composite girder according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

[Composite girder (A) using a concrete member filled with concrete]

Synthetic girder (A) of the present invention is manufactured by assembling the abdominal member 200 and the upper stand 220 filled with the filling concrete 230 in the concrete lower chord 100, the vertical steel pipe 210.

First, when the concrete lower chord 100 has a length corresponding to the extension length of the composite girder (A) as shown in Figure 2a will be made of a precast concrete bottom plate (cuboid-shaped panel) having a predetermined thickness.

The concrete lower chord 100 is pre-stressed in the concrete lower chord 100 by placing the sheath in the longitudinal direction in advance in the inner sheath to later arrange the tension member 110 in the sheath.

Of course, this method is a post-tension method, but prestress may be introduced as a pre-tension method.

A plurality of lower pedestals 120 are installed in the concrete lower chord 100, but the lower end pedestal 120a installed at both ends of the concrete lower chord is different from the installation form of the inner lower pedestal 120b. So first, look at the inner lower support (120b) is installed at a position other than both ends first.

First, the inner lower pedestal (120b) is installed in a position other than the end is installed so that the upper portion is exposed to the outside for the abdominal member 200 to be described later on the upper surface of the concrete lower chord 100.

The inner lower support 120b is a support plate 121b is fixed to the concrete lower chord 100 by the studs 122b so that the upper surface is formed at the same height as the upper surface of the concrete lower chord 100 so that the upper part is exposed. .

In addition, a plurality of abdominal member setting plates 123b formed to be seated and seated on the outer periphery of the upper surface of the support plate 121b are installed to be spaced apart from each other.

As a result, the abdominal member 200 of the present invention can be easily assembled by mounting the abdominal member 200 on the inner lower support 120b without additional effort for position setting.

In addition, the inner part of the abdominal member setting plate 123b penetrates through the base plate 121b, and the lower part is fixed to the concrete lower chord 100 and extends upward to form the upper abdominal composite rod 124b formed to be exposed to the outside. Multiple spacing is installed.

The composite member composite rod 124b is fixed to the support plate 121b by a fastening nut so as not to be bent or deformed due to impact or the like during the manufacture of the girder.

In this case, the tension material (110, in the case of post-tension method) and the inner lower support 120b are pre-set to the concrete lower current formwork installed in the manufacturing site, and the concrete is poured into the inner lower support 120b to integrate the upper surface. The lower chord 100 will be produced.

Next, the end lower supporters 120a installed at both sides of the inner lower supporters 120b, ie, at both ends of the compound girders A, are provided with a plurality of vertical units installed to stiffen the compound girders A at alternating ramen bridges. The fixing member 400 composed of reinforcing bars is installed to vertically penetrate the composite girder A.

Accordingly, the end lower support 120a is installed to be embedded in the concrete lower chord 100, and the fixing member 400 formed of the vertical reinforcement penetrates the inside to extend upward.

The support plate 121a is installed to be exposed from the bottom surface of the concrete lower chord 100, and a plurality of the formed members 200 to be described below are fitted and seated on the outer periphery of the upper surface of the support plate 121a installed on the support plate 121a. The abdominal member setting plate 123a is installed to be spaced apart from each other, and the abdominal member setting plate 123a is set in advance before the concrete lower chord 100 is formed.

In this case, the tension member (110, post-tension type) and the end lower support 120a are set in advance in the concrete lower current formwork installed in the manufacturing site, and the concrete is poured into the lower end support 120a to be embedded. The concrete lower chord 100 will be manufactured.

In this case, the stud and the composite member rod do not need to be separately installed on the end lower support 120a.

Next, as shown in FIG. 2B, the abdominal member 200 filled with concrete in the vertical steel pipe 210 is prepared by first cutting the steel pipe to have a predetermined height of the vertical steel pipe 210.

These steel pipes have a certain diameter and can be used as vertical steel pipes simply by purchasing a ready-made product and cutting them, so that there is no need for expensive processing.

Accordingly, the vertical steel pipe 210 is inserted into the abdominal member setting plates 123a and 123b formed on the support plates 121a and 121b constituting the inner bottom support 120b and the end lower support 120a as described above, and the bottom support plate 121a is provided. It is to be supported on the upper surface of, 121b).

That is, the weight of the vertical steel pipe 210, but the weight is different depending on the thickness and diameter of the steel pipe purchased, but because it has a considerable weight lifting work to accurately set in the concrete lower chord is not practically easy in the field.

Accordingly, the present invention is to allow the vertical steel pipe 210 to be simply installed in the concrete lower chord 100 by allowing the vertical steel pipe 210 to be fitted to the abdominal member setting plate (123a, 123b) to simplify the assembly installation. .

As such, when the vertical steel pipe 210 is seated on the end and the inner lower supporters 120a and 120b by the abdominal member setting plates 123a and 123, the lower supporters 120a and 120b and the vertical steel pipe 210 are welded. Since the position is seated, the welding operation is easy, and if the quality is secured by the welding, if it is concerned, the angle not shown may be fixed by fastening to the lower support 120 using a bolt using a lamp.

When the abdominal member 200 is installed as the vertical steel pipe 210 as described above, the setting is easy and the load transmitted from the upper support 220 can be accurately transmitted by the concrete lower chord 100 by the axial load (vertical load). As a result, the cross-sectional force calculation of the composite girder is simplified, which is very advantageous for the design.

In addition, as will be described later, the cross-sectional area occupied by the vertical steel pipe 210 is much larger by the filling concrete 230 filled therein, unlike the conventional composite truss, which substantially resists the load transmitted from the upper support 220. Since it can act as a member it is possible to optimize the cross section of the concrete lower chord 100.

In addition, since it serves as a formwork for the filling concrete 230 to be filled in the vertical steel pipe 210, it is easy to manufacture the abdominal member 200 as a concrete member, the filling concrete 230 by the vertical steel pipe 210 Since it is constrained, it is very advantageous for supporting axial force and very advantageous for buckling of composite girders. The charging concrete 230 charging method will be described later.

In addition, the height of the vertical steel pipes other than the vertical steel pipe and the end lower support which are installed in the lower end support 120a should be installed to have the same height.

However, since the vertical steel pipe 210 installed at both ends of the lower support 120a is installed to penetrate the concrete lower chord 100, the vertical steel pipes are installed at the lower end support 120a other than the lower end support 120a at both ends. It can be seen that the extension length becomes longer in preparation.

As a result, the sheath, the lower end support 120a, the inner lower support 120b and the vertical steel pipe 210 are set in advance in order to form concrete to form the concrete lower chord 100.

Next, the upper pedestal 220 is installed on the upper surface of the vertical steel pipe 210 as shown in FIG. 2C.

The upper support 220 is to be installed horizontally in the longitudinal direction of the composite girder to be installed on the upper surface of each vertical steel pipe 210, the difference from the lower support 120 is continuously installed as one plate. Concrete filling hole 221 is formed on the upper surface.

In this case, the concrete filling hole 221 is to be formed in the case of the vertical steel pipes located at both ends to form a concrete filling hole 221 corresponding to the diameter of the vertical steel pipe, in the case of the vertical steel pipe except the both ends, the concrete filling smaller than the diameter The hole is to be formed.

This is to allow the filling concrete 230 to be easily filled in the vertical steel pipe 210 through the concrete filling hole 221.

At this time, in particular, the upper pedestal 220 extended to a position other than both ends is installed to extend inside the vertical steel pipe, and the stud 223 for synthesizing with the filling concrete 230 on the bottom of the upper pedestal 220 as shown in FIG. To form.

In addition, a number of studs are formed on the upper surface of the upper base for synthesis with slab concrete.

Furthermore, in the entire upper pedestal 220, the abdominal member setting plate 224 is formed to be spaced apart from each other along the periphery of each vertical steel pipe 210 so that the upper pedestal 220 can be easily fitted to the upper portion of the vertical steel pipe 210. Done.

In this case, if the upper support 220 is seated on the upper end of the vertical steel pipe 210 by the abdominal member setting plate 224, the upper support 220 and the vertical steel pipe 210 can be fixed by welding. Since the position is seated, the welding operation is easy, and if the quality is secured by welding, it is also possible to fasten by fixing to the upper support 220 using a bolt using an angle not shown.

The upper pedestal 220 is to be located on the top of each of the vertical steel pipe (210).

Next, after the upper support 220 is installed in the vertical steel pipe 210, the tension member 110 is tensioned and settled so that prestress is introduced into the concrete lower chord 100. This is because the prestress to be introduced must be introduced below the neutral axis of the girder to effectively resist the tensile force acting on the bottom of the girder.

As a result, it can be seen that the composite girder A according to the present invention is finally completed as shown in FIG. 2C.

[Ramen Bridge Construction Method using Composite Girder (A) Using Concrete Filled Composite Members]

First, as shown in FIG. 3a, a composite girder (A, the same as FIG. 2c) is first manufactured at a factory or the like.

The composite girder (A) is composed of a concrete lower chord 100, end and inner lower support (120a, 120b), the vertical steel pipe 210, the upper support 220 and the tension material formed in the concrete lower chord (100) Prestress is introduced at 110.

This composite girder (A) is mounted on the bridge substructure (B) previously constructed.

This bridge substructure (B) includes a shift and in the present invention, both shifts are installed to face each other in the axial direction, and looks at the basis of the ramen bridge bridge is a composite girder (A) is mounted between the shift.

Accordingly, when the two ramen bridges are constructed, a plurality of bridges are mounted in a lateral direction between the bridge substructures using a lifting device such as a crane using bridge supports (not shown).

The ramen bridge is to install a compound girder (A) between the two shifts, but the two ends of the compound girder is installed by tightening each other with the shift.

To this end, as shown in FIG. 4, the fixing member 400, which is a means capable of rigidifying the composite girder A, may be installed on the upper surfaces of both shifts C.

The fixing member 400 is to use a steel bar. These steel rods are to be fixed to the lower portion is buried in the upper part of the alternating coping portion, the upper end is to be installed to extend upward.

At this time, the upper end of the fixing means 400 is installed so as to extend through both ends of the composite girder (A) for this purpose, the present invention is installed in both ends lower pedestal (120a) to bury and penetrate the concrete lower chord 100 And the vertical steel pipe 210 is installed so that the fixing means 400 penetrates the lower pedestal 120a and the vertical steel pipe 210 at both ends.

This can be simply installed in a way that simply inserts the composite girders (A) to the fixing means 400, the construction is greatly improved.

Next, the upper end of the steel bar, which is the fixing means, is fixed to the upper surface of the composite girder A by using a fastening nut. In this process, both ends of the composite girder A are rigidly attached to the lower bridge structure B.

Next, the slab concrete is poured using a formwork not shown in FIG. 3b.

The slab concrete is constructed so that the ramen bridge slab is finally formed while being filled in the vertical steel pipe 210 through the concrete filling hole 221 of each vertical steel pipe 210 in the pouring process.

At this time, the slab concrete being poured can be visually confirmed whether the filling of the vertical steel pipe (210) through the concrete filling hole (211) is easy to check whether the filling.

In addition, the filling concrete 230 filled in the vertical steel pipe 210 is vertical steel pipe by each stud 223 formed in the vertical steel pipe 210 in the upper pedestal 220 and the lower pedestal (120a, 120b) It becomes possible to integrate with 210.

Furthermore, the tension of the tension member 110, the tension remaining without leaving the settling may be further introduced into the synthetic girder by the prestress of the required.

100: concrete low current
110: tension material
120: lower stand
120a: end lower support
120b: inner bottom support
121a, 121b: base plate
122: stud
123a and 123b: abdominal member setting plate
124: abdominal composite rod
200: abdominal cavity
210: vertical steel pipe
220: upper stand
221: concrete filling hole
222: support plate
224: abdominal member setting plate
400: fixing member
A: Synthetic girder of the present invention
B: Bridge undercarriage (shift)
S: slab

Claims (6)

Concrete lower chord 100 having a thickness T in the form of a panel;
It is installed to be embedded inside both ends of the concrete lower chord 100, and includes a support plate (121a) and spaced apart from each other exposed on the bottom surface of the concrete lower chord and the abdominal member setting plate (123a) installed around the top of the base plate End lower support 120a;
An inner lower supporter including a support plate 121b that is spaced apart from each other on an upper surface of the concrete lower chord 100 between the lower supporters 120a between the both ends, and an abdominal member setting plate 123b installed around the support plate upper surface. 120b); And
The abdominal member setting plate (123a, 123b) is fitted to be installed so that the outer peripheral surface is in contact with the fixed vertical steel pipe 210 and the top of the vertical steel pipe 210 is installed, the support plate 221 formed concrete filling hole 221 on the upper surface And an upper supporter 220 including an abdominal member setting plate 224 installed around the bottom of the support plate;
Vertical girder pipe 210 is fitted to the both bottom lower pedestal (120a) is a composite girder using a vertical steel pipe as a member, characterized in that it is arranged to pass through the concrete lower chord 100. The method of claim 1,
The vertical steel pipe 210 is to be filled in the vertical steel pipe inside the vertical steel pipe through the concrete filling hole 221 when the concrete is poured to form the slab (S) is characterized in that the filling concrete 230 is formed Composite girders using vertical steel pipes as abdominal members. The method of claim 1,
A stud 122 is formed on the bottom of the supporting plate 121b of the inner lower support 120b so that the support plate 121b is fixed to the concrete lower chord 100, and the support plate 121b of the lower support penetrates the support plate. The lower part is fixed to the concrete lower chord and extended upward to form a plurality of composite member rods 124 formed so that the upper portion is exposed to the outside so that the filled concrete behaves integrally with the vertical steel pipe by the composite member rod Composite girder using a vertical steel pipe as a member. The method of claim 3,
The stud 223 is formed on the bottom of the support plate 220 of the upper support plate 220 installed on the upper end of the vertical steel pipe fitted into the inner lower support 120b so that the filling concrete 230 and the vertical steel pipe 210 are formed by the stud. Composite girder using a vertical steel pipe as a member, characterized in that to act integrally. The method of claim 1,
The tension lower portion 110 extending in the longitudinal direction is further installed in the concrete lower chord 100 so that prestress is introduced, and the tension member 110 is characterized in that part of the tension member 110 is settled after tension before the slab is formed. Composite girders using vertical steel pipes as abdominal members. The lower part is embedded in the upper surface is fixed and the lower bridge (B) is installed, the fixing member 400 is installed so that the upper portion is extended upward,
Mounting the vertical steel pipe (210) installed in the lower end support (120a) constituting the composite girder (A) of claim 1 to the bridge lower structure so that the fixing member 400 penetrates and synthesizes the fixing unit (400) It is fixed to the upper surface of the girder (A) to stiffen the composite girder to the alternating lower structure,
Placing concrete on top of the synthetic girder to form a slab, when the concrete to form the slab (S) when the concrete is filled in each vertical steel pipe 210 through the concrete filling hole 221 Ramen bridge construction method using a composite girder using a vertical steel pipe as a member, characterized in that the filling concrete 230 is formed in the vertical steel pipe.

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