KR101178256B1 - Prestressed c-shaped steel pipe girder and it's construction method - Google Patents

Abstract

PURPOSE: A prestressed C-shaped steel pipe girder and a construction method thereof are provided to facilitate construction by filling a C-shaped steel pipe with concrete and applying pre-stress to a PS steel member. CONSTITUTION: A prestressed C-shaped steel pipe girder(G) comprises a C-shaped steel pipe, upper flanges, a PS steel member(30), PS steel member anchorages(40), concrete(50), a slab(60), and shear connectors. The upper flanges are installed on both ends of the C-shaped steel pipe. The PS steel member crosses the inside the C-shaped steel pipe. The PS steel member anchorages fix the PS steel member to both ends of the C-shaped steel pipe. The inside the C-shaped steel pipe is filled with the concrete. The slab is formed on the top of the C-shaped steel pipe. The shear connectors are attached on the top surfaces of the upper flanges.

Description

Prestressed C-shaped steel pipe girder and it's construction method

The present invention relates to a prestressed C-type steel pipe and a construction method thereof, and in particular, by using a C-type steel pipe having an open top by cutting a central portion of a circular steel pipe, the concrete is easily filled in the steel pipe, and a prestress is introduced into the PS steel. The present invention relates to a prestressed C-type steel pipe girder and a construction method thereof.

Generally, concrete filled steel pipe girders are used at home and abroad by filling concrete in circular steel pipes and used as girders, but they are not widely used due to the difficulty of manufacturing and construction and the expensive construction cost. It is only used in this situation.

Here, the above-mentioned concrete filled steel pipe girders are low-profile, long span girder is impossible due to the characteristics of the cross-section of the circular steel pipe, the steel requirements for the production and construction of the circular steel pipe is very uneconomical compared to the efficiency, it is difficult to manufacture and is not commonly used. I'm not doing it.

In addition, in the case of filling the concrete in the circular steel pipe, the lightweight concrete is filled in the circular steel pipe, but this also increases the weight of the self rather than the increase in efficiency, it is impossible to implement a low-profile, long-span girders, and manufacturing and construction Very difficult and expensive construction costs are not universally used.

And in filling lightweight concrete inside the circular steel pipe there is a very big problem that can not determine the accuracy of the concrete filling by filling the concrete by drilling a hole in the circular steel pipe separately, there is a very difficult problem in construction.

Thus, the present invention was devised to solve the problems described above, by using the C-type steel pipe is open at the top by cutting the center of the circular steel pipe, easily filled concrete inside the steel pipe, PS steel The purpose of the present invention is to provide prestressed C-type steel pipe girders and construction methods thereof, by which pre-stresses are used for easy construction, low construction cost, and excellent bridges.

Prestressed C-type steel pipe girders according to the present invention for achieving the above object is a C-type steel pipe is opened by cutting the central portion of the circular steel pipe; Upper flanges welded on both ends of the upper opening of the C-shaped steel pipe; A PS steel material disposed across the inside of the C-type steel pipe; A PS steel fixing part for fixing the PS steel to both ends of the C-type steel pipe; Concrete which is partially or wholly filled inside the C-type steel pipe; The upper portion of the C-type steel pipe is composed of a slab of concrete poured and cured, characterized in that the prestress is introduced into the concrete by the PS steel.

In addition, the pre-stressed C-type steel pipe girder construction method according to the present invention for achieving the above object is a C-type steel pipe open by cutting the central portion of the circular steel pipe; Upper flanges welded on both ends of the upper opening of the C-shaped steel pipe; A PS steel material disposed across the inside of the C-type steel pipe; A PS steel fixing part for fixing the PS steel to both ends of the C-type steel pipe; Concrete which is partially or entirely filled in the C-type steel pipe; The upper portion of the C-type steel pipe is made of concrete slab and cured slab, the upper portion of the inner and outer points of the C-type steel pipe is closed by the upper flange of the opening of the C-type steel pipe, the upper flange of the C-type steel pipe A shear connection member is attached to an upper surface, and a shear connection member is attached to the inside of the C-type steel pipe, and a method of constructing a pre-stressed C-type steel pipe girder, wherein the prestress is introduced into concrete by the PS steel. Producing a; Attaching upper flanges on both side ends of the C-type steel pipe to form a C-type steel pipe girder; Installing the C-type steel pipe girders in alternating and piers; Installing PS steel fixing portions at both ends of the C-type steel pipe girder, and disposing the PS steel across the PS steel fixing portions; Placing and curing concrete in whole or in part inside the C-type steel pipe; Placing and curing concrete on an upper surface of the C-type steel pipe girder to form a slab; It is characterized by consisting of the step of introducing the prestress to the concrete by tensioning the PS steel.

As described above, the prestressed C-type steel pipe girder and its construction method according to the present invention has the following effects.

First, the present invention uses a C-type steel pipe with an open top by cutting the central portion of the circular steel pipe instead of a circular steel pipe, filling the inside of the C-type steel pipe, and by introducing a pre-stressed with PS steel, construction is easy And, the construction cost is low, there is an advantage that can build a bridge with excellent aesthetics.

Second, the present invention is easy to manufacture the C-type steel pipe by cutting the circular steel pipe, and easy to manufacture C-type steel pipe, the installation of concrete and PS steel materials and the introduction of pre-stress to facilitate the construction while reducing the steel It is easy to reduce the construction cost and the aesthetics also has an excellent advantage.

Third, the present invention is advantageous to the warp or maintenance of the girder by filling the C-type steel pipe as a whole or part of the concrete, as needed, it is possible to reduce the use of steel by reducing the weight of the C-type steel pipe girders.

Fourth, the present invention, the upper flange of the C-type steel pipe is a closed cross-section at the inner and outer points of the C-type steel pipe girders to cope with the tensile stress at the inner branch portion (sub-moment portion) and to reinforce the PS steel fixing portion at the outer branch portion This has the advantage.

1 is a side view showing a simple bridge having a prestressed C-type steel pipe girder according to the present invention 1,
2 is a sectional view taken along the line AA in Fig. 1,
3 is a cross-sectional view taken along line BB of FIG.
Figure 4 is a side view showing a simple bridge installed prestressed C-type steel pipe girder according to the present invention 2,
5 is a cross-sectional view taken along the line AA of FIG.
6 is a cross-sectional view taken along line BB of FIG.
Figure 7 is a side view showing a simple bridge installed prestressed C-type steel pipe girders according to the present invention,
8 is a cross-sectional view taken along the line AA of FIG.
9 is a cross-sectional view taken along line BB of FIG.
10 is a side view showing a continuous bridge installed prestressed C-type steel pipe girders according to the present invention 1,
11 is a cross-sectional view taken along the line AA of FIG. 10;
12 is a cross-sectional view taken along line BB of FIG. 10;
13 is a cross-sectional view taken along line CC of FIG. 10;
Figure 14 is a side view showing a continuous bridge installed prestressed C-type steel pipe girders according to the present invention,
15 is a cross-sectional view taken along the line AA of FIG. 14;
16 is a cross-sectional view taken along line BB of FIG. 14;
17 is a cross-sectional view taken along line CC of FIG. 14;
18 is a side view showing a continuous bridge in which prestressed C-type steel pipe girders are installed according to the present invention;
19 is a cross-sectional view taken along the line AA of FIG. 18;
20 is a cross-sectional view taken along line BB of FIG. 18;
21 is a cross-sectional view taken along line CC of FIG. 18.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

[Simple]

1 is a side view showing a simple bridge having a pre-stressed C-type steel pipe girder according to the present invention, Figure 2 is a cross-sectional view taken along line AA of Figure 1, Figure 3 is a cross-sectional view taken along line BB of Figure 1, Figure 4 is a prestress according to the present invention 2, 5 is a cross-sectional view taken along line AA of FIG. 4, FIG. 6 is a cross-sectional view taken along line BB of FIG. 4, and FIG. 7 is a simple bridge provided with a prestressed C-type steel pipe girder according to the present invention. 3 and 8 are cross-sectional views taken along line AA of FIG. 7, and FIG. 9 is a cross-sectional view taken along line BB of FIG. 7.

As shown in these figures, the pre-stressed C-type steel pipe girders (G) according to the present invention is a C-type steel pipe 10 is opened by cutting the central portion of the circular steel pipe 10; An upper flange 20 welded to both ends of the upper opening 12 of the C-type steel pipe 10; A PS steel material 30 disposed across the inside of the C-type steel pipe 10; A PS steel fixing part 40 for fixing the PS steel 30 to both ends of the C-type steel pipe 10; Concrete (50) filled in part or the whole of the C-type steel pipe (10); The upper portion of the C-type steel pipe 10 is composed of a slab (60) in which concrete is poured and cured, and the prestress is introduced into the concrete (50) by the PS steel material (30).

That is, the prestressed C-type steel pipe girders (G) according to the present invention is a C-type steel pipe 10, the upper flange 20, PS steel 30, PS steel mounting portion 40, concrete 50 and slab 60 )

Here, the C-type steel pipe 10 is easy to manufacture by using the semi-circular steel pipe is open to the top cut half without using the circular steel pipe as it is, the concrete 50 placing and PS steel 30 installation and prestress Easy to introduce has the effect of reducing steel.

In addition, the inside of the C-type steel pipe 10 is a shear connector 70 is attached to promote the adhesion with the concrete 50 to be filled.

Here, the C-type steel pipe 10 may be filled with the entire concrete 50 inside for warping or maintenance of the C-type steel pipe girders (G), the concrete 50 only in the required portion according to the moment diagram Note that it can also be charged.

On the other hand, the upper flange 20 is partially welded on both ends of the upper opening 12 of the C-type steel pipe 10, or in a state of covering a portion of the upper opening 12 of the C-type steel pipe 10 Welding can be installed.

In particular, the upper flange 20 is installed in a closed section at the inner and outer branch portions of the C-type steel pipe girders (G) to correspond to the tensile stress in the inner branch portion (sub-moment portion), PS in the outer branch portion To reinforce the steel fixing portion 40.

In addition, the PS steel material 30 is disposed across the interior of the C-type steel pipe 10 in order to introduce prestress inside the C-type steel pipe 10, the PS steel 30 is C-type steel pipe 10 It is fixed to the PS steel fixing portion 40 at both ends of the.

Hereinafter, the simple bridge construction of the prestressed C-type steel pipe girder according to the present invention having the configuration as described above will be described.

As shown in Figure 1 to 9, the pre-stressed C-type steel pipe girder construction method according to the present invention comprises the steps of manufacturing the C-type steel pipe (10); Attaching an upper flange 20 to both upper ends of the C-type steel pipe 10 to form a C-type steel pipe girder G; Installing the C-type steel pipe girders G on an alternating surface A; Installing PS steel fixing portions 40 at both ends of the C-type steel pipe girder G, and arranging the PS steel materials 30 across the PS steel fixing portions 40; Placing and curing concrete (50) on the whole or part of the inside of the C-type steel pipe (10); Placing and curing concrete on the upper surface of the C-type steel pipe girders (G) to form a slab (60); By tensioning the PS steel 10 is made of a step of introducing a pre-stress to the concrete (50).

That is, the pre-stressed C-type steel pipe girder construction method according to the present invention by attaching a shear connection member 70 therein to produce a C-type steel pipe 10, the upper flange 20 on both sides of the upper portion of the C-type steel pipe (10) ), The C-type steel pipe girders (G) are installed on the alternating portion (A), and PS steel material fixing portions (40) are installed at both ends of the C-type steel pipe girders (G), and the PS steel mounting portions are 40 after placing the PS steel 30 across the interior, the concrete 50 is placed and cured in the C-type steel pipe 10, and then concrete is placed on the upper surface of the C-type steel pipe girders (G). After placing and curing to form the slab 60, the PS steel 10 is tensioned to introduce prestress into the concrete 50.

[Continuous bridge]

10 is a side view showing a continuous bridge provided with prestressed C-type steel pipe girders according to the present invention, FIG. 11 is a cross-sectional view taken along line AA of FIG. 10, FIG. 12 is a cross-sectional view taken along line BB of FIG. 10, FIG. Sectional drawing, FIG. 14 is a side view showing a continuous bridge provided with a prestressed C-type steel pipe girder according to the present invention, FIG. 14 is a sectional view taken along line AA of FIG. 14, FIG. 16 is a sectional view taken along line BB of FIG. 14, and FIG. CC line sectional drawing, FIG. 18 is a side view 3, 19 is AA sectional drawing of FIG. 18, FIG. 18 is BB sectional drawing of FIG. 18, FIG. 18 is a cross-sectional view of the CC line.

As shown in these figures, the pre-stressed C-type steel pipe girders (G) according to the present invention is a C-type steel pipe 10 is opened by cutting the central portion of the circular steel pipe 10; An upper flange 20 welded to both ends of the upper opening 12 of the C-type steel pipe 10; A PS steel material 30 disposed across the inside of the C-type steel pipe 10; A PS steel fixing part 40 for fixing the PS steel 30 to both ends of the C-type steel pipe 10; Concrete (50) filled in part or the whole of the C-type steel pipe (10); The concrete 50 is composed of the slab 60 is placed and cured on the upper portion of the C-type steel pipe 10, the PS steel material 30 by the prestress is introduced into the concrete (50).

That is, the prestressed C-type steel pipe girders (G) according to the present invention is a C-type steel pipe 10, the upper flange 20, PS steel 30, PS steel mounting portion 40, concrete 50 and slab 60 )

Here, the C-type steel pipe 10 is easy to manufacture by using a semi-circular steel pipe with an open top cut half without using the circular steel pipe as it is, and easy to install concrete and install the PS steel and the introduction of prestress steel There is an effect to reduce the.

In addition, the inside of the C-type steel pipe 10 is a shear connector 70 is attached to promote the adhesion with the concrete 50 to be filled.

Here, the C-type steel pipe 10 may be filled with the entire concrete 50 inside for warping or maintenance of the C-type steel pipe girders (G), the concrete 50 only in the required portion according to the moment diagram Note that it can also be charged.

On the other hand, the upper flange 20 is partially welded on both ends of the upper opening 12 of the C-type steel pipe 10, or in a state of covering a portion of the upper opening 12 of the C-type steel pipe 10 Welding can be installed.

In particular, the upper flange 20 is installed as a closed cross-section at the inner and outer branches of the C-type steel pipe girders (G) to correspond to the tensile stress in the inner branches (sub-moment), PS in the outer branches To reinforce the steel fixing portion 40.

In addition, the PS steel material 30 is disposed across the interior of the C-type steel pipe 10 in order to introduce prestress inside the C-type steel pipe 10, the PS steel 30 is C-type steel pipe 10 It is fixed to the PS steel fixing portion 40 at both ends of the.

Hereinafter, the construction of the continuous bridge of the prestressed C-type steel pipe girders according to the present invention having the configuration as described above.

As shown in Figure 10 to 21, the prestressed C-type steel pipe girder construction method according to the present invention comprises the steps of manufacturing the C-type steel pipe (10); Attaching an upper flange 20 to both upper ends of the C-type steel pipe 10 to form a C-type steel pipe girder G; Installing the C-type steel pipe girders (G) on alternating (A) and pier (P); Installing PS steel fixing portions 40 at both ends of the C-type steel pipe girder G, and arranging the PS steel materials 30 across the PS steel fixing portions 40; Placing and curing concrete (50) on the whole or part of the inside of the C-type steel pipe (10); Placing and curing the concrete (50) on the upper surface of the C-type steel pipe girders (G) to form a slab (60); By tensioning the PS steel 30 is made of a step of introducing a prestress to the concrete (50).

That is, the pre-stressed C-type steel pipe girder construction method according to the present invention by attaching a shear connection member 70 therein to produce a C-type steel pipe 10, the upper flange 20 on both sides of the upper portion of the C-type steel pipe (10) ), The C-type steel pipe girders (G) are installed on the alternating portion (A) and the piers, and the PS steel material fixing portion 40 is installed at both ends of the C-type steel pipe girders (G), and the PS steel After arranging the PS steel material 30 between the fixing units 40, the concrete 50 is poured and cured in the C-type steel pipe 10, and then placed on the upper surface of the C-type steel pipe girder G. After placing and curing concrete to form a slab, the PS steel 30 is tensioned to introduce prestress into the concrete 50.

In addition, the pre-stressed C-type steel pipe girder (G) construction method according to the present invention comprises the steps of manufacturing the C-type steel pipe (10); Attaching an upper flange 20 to both upper ends of the C-type steel pipe 10 to form a C-type steel pipe girder G; Installing PS steel fixing portions 40 at both ends of the C-type steel pipe girder G, and arranging the PS steel materials 30 across the PS steel fixing portions 40; Placing and curing concrete (50) on the whole or part of the inside of the C-type steel pipe (10); Tensioning the PS steel (30) to introduce prestress into the concrete (50); Installing the C-type steel pipe girders (G) on alternating (A) and pier (P); Placing and curing concrete on the upper surface of the C-type steel pipe girders (G) consists of a step of forming a slab (60).

That is, the pre-stressed C-type steel pipe girder construction method according to the present invention by attaching a shear connection member 70 therein to produce a C-type steel pipe 10, the upper flange 20 on both sides of the upper portion of the C-type steel pipe (10) ) And then, the PS steel material fixing portion 40 is installed at both ends of the C-type steel pipe girder G, and the PS steel material 30 is disposed across the PS steel material fixing portion 40, and then After placing and curing the concrete 50 inside the C-type steel pipe 10, the PS steel 30 is tensioned to introduce prestress into the concrete 50, and then the C-type steel pipe girders G are alternately rotated ( After installing on A) and the pier P, the concrete is poured and cured on the upper surface of the C-type steel pipe girder G to form the slab 60.

10: C-type steel pipe 12: opening
20: upper flange 30: PS steel
40: PS steel fixing part 50: concrete
60: slab 70: shear connector
80: crossroad A: shift
G: Type C steel pipe girder P: Pier

Claims (5)

A C-shaped steel pipe 10 having an open top by cutting a central portion of the circular steel pipe; An upper flange 20 welded to both ends of the upper opening 12 of the C-type steel pipe 10; A PS steel material 30 disposed across the inside of the C-type steel pipe 10; A PS steel fixing part 40 for fixing the PS steel 30 to both ends of the C-type steel pipe 10; Concrete (50) filled in part or the whole of the C-type steel pipe (10); The slab 60 in which concrete is poured and cured on the upper portion of the C-type steel pipe 10, and the upper flange 20 on the inner, outer point portions 14, 16 of the C-type steel pipe 10 The opening 12 of the C-type steel pipe 10 is closed, the shear connector 70 is attached to the upper surface of the upper flange 20 of the C-type steel pipe 10, the inside of the C-type steel pipe 10 Pre-stressed C-type steel pipe girder, characterized in that the shear connection member 70 is attached, the pre-stress is introduced into the concrete (50) by the PS steel (30). delete delete A C-shaped steel pipe 10 having an open top by cutting a central portion of the circular steel pipe; An upper flange 20 welded to both ends of the upper opening 12 of the C-type steel pipe 10; A PS steel material 30 disposed across the inside of the C-type steel pipe 10; A PS steel fixing part 40 for fixing the PS steel 30 to both ends of the C-type steel pipe 10; Concrete (50) filled in part or the whole of the C-type steel pipe (10); The slab 60 in which concrete is poured and cured on the upper portion of the C-type steel pipe 10, and the upper flange 20 on the inner, outer point portions 14, 16 of the C-type steel pipe 10 The opening 12 of the C-type steel pipe 10 is closed, the shear connector 70 is attached to the upper surface of the upper flange 20 of the C-type steel pipe 10, the inside of the C-type steel pipe 10 As a method for constructing a pre-stressed C-type steel pipe girder, characterized in that the shear connection member 70 is attached, and the prestress is introduced into the concrete 50 by the PS steel material 30.
Manufacturing a C-type steel pipe 10; Attaching an upper flange 20 to both upper ends of the C-type steel pipe 10 to form a C-type steel pipe girder G; Installing the C-type steel pipe girders (G) on alternating (A) and pier (P); Installing PS steel fixing portions 40 at both ends of the C-type steel pipe girder G, and arranging the PS steel materials 30 across the PS steel fixing portions 40; Placing and curing concrete (50) on the whole or part of the inside of the C-type steel pipe (10); Placing and curing concrete on the upper surface of the C-type steel pipe girders (G) to form a slab (60); Prestressing C-type steel pipe girder construction method comprising the step of introducing the prestress to the concrete (50) by tensioning the PS steel (10). A C-shaped steel pipe 10 having an open top by cutting a central portion of the circular steel pipe; An upper flange 20 welded to both ends of the upper opening 12 of the C-type steel pipe 10; A PS steel material 30 disposed across the inside of the C-type steel pipe 10; A PS steel fixing part 40 for fixing the PS steel 30 to both ends of the C-type steel pipe 10; Concrete (50) filled in part or the whole of the C-type steel pipe (10); The slab 60 in which concrete is poured and cured on the upper portion of the C-type steel pipe 10, and the upper flange 20 on the inner, outer point portions 14, 16 of the C-type steel pipe 10 The opening 12 of the C-type steel pipe 10 is closed, the shear connector 70 is attached to the upper surface of the upper flange 20 of the C-type steel pipe 10, the inside of the C-type steel pipe 10 As a method for constructing a pre-stressed C-type steel pipe girder, characterized in that the shear connection member 70 is attached, and the prestress is introduced into the concrete 50 by the PS steel material 30.
Manufacturing a C-type steel pipe 10; Attaching an upper flange 20 to both upper ends of the C-type steel pipe 10 to form a C-type steel pipe girder G; Installing PS steel fixing portions 40 at both ends of the C-type steel pipe girder G, and arranging the PS steel materials 30 across the PS steel fixing portions 40; Placing and curing concrete (50) on the whole or part of the inside of the C-type steel pipe (10); Tensioning the PS steel (10) to introduce prestress into the concrete (50); Installing the C-type steel pipe girders (G) on alternating (A) and pier (P); Prestressing C-type steel pipe girder construction method comprising the step of forming and curing the concrete on the upper surface of the C-type steel pipe girders (G) to form a slab (60).

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