KR101286116B1 - Composite girder with steel pipe and bridge construction method using the same - Google Patents

Abstract

It is a composite girder using a vertical steel pipe as a double member that can be easily assembled and has excellent structural efficiency and economical construction, and a bridge construction method using the same.The vertical steel pipe is prefabricated to be installed on concrete upper and lower chords. In the vertical steel pipe, filled concrete is filled together when the concrete phase current is formed.

Description

Composite girders using vertical steel pipes as a composite member and bridge construction method using them {COMPOSITE GIRDER WITH STEEL PIPE AND BRIDGE CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a composite girder using a vertical steel pipe as a member and a bridge construction method 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, so that the bridge can be economically constructed.

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 the concrete undercarriage prefabricated.

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. The present invention relates to a composite girder and a bridge construction method using the same to produce a composite girder structurally and economically.

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 have advanced technical skills and can be economically manufactured 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 settled on the concrete lower chord.

The concrete upper chord is installed in the upper butt, but the upper support is also installed in the abdominal member setting plate to be able to simply install the upper butt on the top of the vertical steel pipe.

Thus, simply by fixing the vertical steel pipe to the upper and lower pedestal so that the composite girder assembly 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 production and installation becomes very simple, the structurally effective concrete covering member is filled with the interior when the concrete is poured to form a concrete phase current inside. To form.

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.

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.

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,
2a, 2b, 2c and 2d is a manufacturing flow chart of a composite girder using a vertical steel pipe according to the present invention as a covering member,
3 is a complete perspective view of a composite girder using a vertical steel pipe according to the present invention as a abdominal member,
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 composite member 200 and the concrete upper chord 300 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 floorboard having a predetermined thickness (cuboid concrete panel form)

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.

At this time, the upper surface of the concrete lower chord 100 is installed so that the upper portion is exposed to the outside by installing a lower support 120 for installing the abdominal member 200 which will be described later.

The lower support 120 is a support plate 121 is fixed to the concrete lower chord 100 by the stud 122 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 surface is exposed.

In addition, the outer periphery of the upper surface of the support plate 121 is provided with a plurality of the abdominal member setting plate 123 formed to be seated by seating the abdominal member 200 which will be described later.

As a result, the abdominal member 200 of the present invention can be assembled by easily seating the abdominal member 200 to the lower support 120 without the need for extra effort for position setting.

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

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

Therefore, the tension member (110, in the case of the post-tension method) and the lower support 120 are pre-set to the concrete lower current formwork (not shown) installed in the manufacturing site in advance, and the concrete is integrated with the lower support 120 by pouring concrete. The lower chord 100 will be produced.

Next, as shown in FIG. 2B, the abdominal member 200 filled with concrete in the vertical steel pipe is prepared by cutting the steel pipe so that the vertical steel pipe 210 has a predetermined height.

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 plate 123 formed on the support plate 121 constituting the lower support 120 as described above so that the bottom surface is supported on the upper surface of the support plate 121.

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

Accordingly, the present invention is to enable the vertical steel pipe 210 to be installed in the concrete lower chord 100 simply by installing the vertical steel pipe 210 is fitted to the abdominal member setting plate 123 to simplify the assembly installation.

As such, when the vertical steel pipe 210 is seated on the lower support 120 by the abdominal member setting plate 123, the lower support 120 and the vertical steel pipe 210 may be fixed by welding. If the work is easy and the quality is secured by welding, the angle not shown may be fixed by fastening to the support plate 121 of the lower support 120 by using a bolt.

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 concrete upper chord 300 is accurately held by the concrete lower chord 100 by the axial load (vertical load). It can be transferred, simplifying the calculation of the cross-sectional force of composite girder, which is very advantageous for design and manufacture.

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 concrete phase chord 300. Since it can act as a structural member it is possible to optimize the cross section of the concrete upper chord 300 and 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.

Next, on the upper surface of the vertical steel pipe 210, as shown in FIG. 2c, the upper base 220 for installing the concrete upper chord 300 is installed.

The upper pedestal 220 is to be installed to easily support the concrete upper chord 300, the difference from the lower pedestal 120 is that the concrete filling hole 221 is formed on the upper surface, respectively.

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

The upper support 220 is such that the studs 223 are formed on the bottom of the support plate 222 to be combined with the filling concrete, and the abdominal member setting plate 224 is spaced apart from each other along the bottom of the vertical steel pipe 210 and the support plate bottom. The upper pedestal 220 is to be easily fitted to the top of the vertical steel pipe (210).

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 installed 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.

Next, the concrete upper chord 300 is formed as a concrete lower chord 100 using a formwork, etc., not shown so that the upper surface of the upper support 220, as shown in FIG. 2d.

At this time, the concrete to be poured (for concrete phase current) is to be filled up to the inside of the vertical steel pipe 210 through the concrete filling hole 211 formed on the upper surface of the vertical steel pipe 210 and whether the filling through the concrete filling hole 211 It can be checked with the naked eye, so it is easy to check whether the filling.

In addition, the filling concrete 230 filled in the vertical steel pipe 210, each of the studs 223 and the composite member 124 formed on the upper pedestal 220 and the lower pedestal 120 extending into the vertical steel pipe 210, respectively. By it is possible to integrate with the vertical steel pipe (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.

Thus it can be seen that the final composite girder (A) according to the present invention as shown in FIG. 3, and can be easily assembled and fabricated as a concrete lower chord 100, a plurality of members 200, and a concrete upper chord 300. It can be seen that.

[Bridge construction method using composite girders (A) using concrete filled concrete members]

First, as shown in FIG. 4a, the composite girder A is first manufactured at a factory or the like.

In the composite girder (A), the filling concrete 230 to be filled in the concrete phase current 300 and the vertical steel pipe (210) is manufactured directly in the field to minimize the weight of the composite girder (A) to be carried to the site It may be.

The composite girder (A) is configured to include a concrete lower chord 100, a vertical steel pipe 210 filled with filling concrete, a concrete upper chord 300, as shown in Figure 3 and the tension material formed in the concrete lower chord (100) Prestress is introduced by the 110.

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

The bridge substructure B includes an alternating and piering, and in the present invention, both shifts are installed to face each other in the axial direction, and the bridge girder A will be described based on a short span bridge on which the composite girder A is mounted.

Therefore, when both shifts are constructed, a plurality of bridges are mounted in a transverse direction between bridge substructures using a lifting device such as a crane using a bridge support (not shown).

Next, as shown in FIG. 4B, the slab S may be constructed by using a formwork or a deck plate not shown on the upper surface of the composite girder A, thereby completing the final bridge.

100: concrete low current
110: tension material
120: lower stand
121: base plate
122: stud
123: 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
223: stud
224: abdominal member setting plate
230: filling concrete
300: concrete phase present
A: Synthetic girder of the present invention
B: bridge undercarriage
S: slab

Claims (5)

Concrete lower chord 100 having a thickness T in the form of a panel;
A lower supporter 120 including a support plate 121 having an upper surface exposed on an upper surface of the concrete lower chord and an abdominal member setting plate 123 installed around the support plate upper surface;
The abdominal member setting plate is fitted so that the outer peripheral surface is in contact with the fixed and fixed vertical steel pipe 210 and the upper end of the vertical steel pipe is installed and the support plate 222 formed in the upper surface of the concrete filling hole and the abdominal member setting plate 224 installed around the base plate bottom surface Abdominal member 200 including; And
Including the concrete upper chord 300 is formed so that the support plate of the upper support; Concrete is filled in the vertical steel pipe through the concrete filling hole when the concrete is poured to form the filling concrete inside the vertical steel pipe ( Composite girder using a vertical steel pipe as a member, characterized in that 230 is formed with a concrete phase chord 300. The method of claim 1,
A stud 122 is formed on the bottom of the base plate of the lower base so that the base plate is fixed to the concrete lower chord. Composite composite girder using a vertical steel pipe as a covering member, characterized in that a plurality of the composite member formed to expose the 124 is formed so that the filled concrete behaves integrally with the vertical steel pipe by the composite member composite rod. The method of claim 2,
Stud 223 is formed on the bottom of the base plate of the upper support, the composite girder using a vertical steel pipe as a member, characterized in that the charging concrete is integrally behaved with the vertical steel pipe by the stud. The method of claim 1,
The tension lower portion 110 extending in the longitudinal direction is installed inside the concrete lower chord so that the prestress is introduced, and the tensioning material is settled after tension before the concrete upper chord is installed, and the remaining tension material is installed after the concrete upper chord is installed. Composite girder using a vertical steel pipe as a abdominal member, characterized in that to be settled after tension in. Install the bridge undercarriage,
Mounting the compound girder (A) of claim 1 to the bridge substructure (B),
Bridge construction method using a composite girder using a vertical steel pipe as a member, characterized in that it comprises the step of forming a slab (S) on the top of the composite girder.

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