KR100545490B1 - steel box girder for bridge - Google Patents

Abstract

The present invention relates to a reinforcement structure of a steel box-type bridge, more specifically, a double steel box-type bridge using a filler to resist external forces by using a filler as a rigid material between an outer steel box and an inner steel box, and a steel box-type bridge (1) comprises an outer box 100 and the inner box 200, and install a plurality of projections 101 and the fastening member 300 to strengthen the space (S) between them and strengthen the binding force, and Filling the filler 400 between the two boxes 100, 200 (space) (S) to improve the structural rigidity of the bridge.

Description

Double steel box girder bridge using filling material {steel box girder for bridge}             

1 is a partial perspective view briefly showing a conventional steel box-shaped bridge partially

FIG. 2 is a view in which only the parent cement section is filled after steel fabrication by a conventional method in order to increase the rigidity of a branch portion of a conventional steel box type bridge.

Figure 3 is a perspective view showing a double steel box girder bridge using the present invention filler

4 is a plan view of a double steel box girder bridge using the present invention filler

5 is a cross-sectional view taken along the line AA ′ of FIG. 4.

Figure 6 is a view showing a state filled between the outer box and the inner box of the double steel box bridge of the present invention

7 is a view showing a state in which the P.S steel wire is inserted into the double steel box girder bridge using the present invention filler

8a or 8b is a view showing a connection method of the double steel box girder bridge of the present invention,

9a or 9b is a view showing another connection method of the double steel box girder bridge of the present invention,

Figure 10a or Figure 10b is a view showing another connection method of the double steel box girder bridge of the present invention

11 is a view showing another embodiment of a double steel box girder bridge using the present invention filler

12 is a view showing another embodiment of a double steel box girder bridge using the present invention filler

                 <Description of Symbols for Main Parts of Drawings>

1: steel box bridge 100: outer box 101: protrusion

110,240: lower plate 120,210: side plate 130: upper plate

131: injection hole 102,132,201,211 ,: hole 410: reinforcement plate

200: inner box 202: cutout 212: air outlet

220: wing 230: upper blind plate 300: fastening member

400: filler 500: fastening bolt 510: nut

520: grid 600: partition 700: cross beam

S: Space P: P.S Steel Wire W: Welded Area

The present invention relates to a reinforcing structure of a steel box bridge, and more particularly, to a double steel box bridge using a filler to resist external forces by using a filler as a rigid material between the outer steel box and the inner steel box.

In general, steel box bridge is a general term of bridge with thin closed box cross section. It is not only clean, but also has high non-stiffness and large compression section that resists the moment on the point of continuous bridge. Maintains a slender cross-section with lower mold height.

Because of these advantages, it is widely used in bridges that require large gap stiffness such as curved bridges, elevated roadways in cities that are highly restricted by linearity, and bridges where aesthetics is important to harmonize with the surrounding sculptures.

On the basis of the above advantages, etc., domestic patent application No. 2001-0029592 (multi-steel box mold and a method of reinforcing a mold using the same) has been filed, but there are many structural defects. For example, as shown in FIG. 1, inside the box-shaped bridge 1, horizontal ribs 10, vertical ribs 11, and vertical and horizontal reinforcement materials 20 and 21 are manufactured to a standard. In addition, it requires time to assemble and weld it one by one, and it takes a long time and air, and also because the vibration caused by the driving of the vehicle is big, the fatigue of the bridge is increased, the service life is reduced, and the noise is large. there was.

In addition, there is a hassle to install a diaphram 30 every 5 m to perform the torsional behavior of the steel box bridge.

Therefore, in order to solve the problems of the steel box-type bridges, the improved steel box-type bridges have been filed in Korean Patent Application No. 1998-0044233 (Stiffness Ship Construction Method near the inner point by concrete filling in steel box bridges).

That is, in the construction of the steel box bridge, the step of installing a shear connector in the lower portion of the inside of the box-shaped cross-section corresponding to 10% of the length of each span to the left and right of the inner point; To the step of filling the concrete in the above section,

This is to increase the cross-sectional stiffness of the section in order to correspond to the large moment of the parent section, as shown in Figure 2, in order to improve the stiffness, the material material is cheap and advantageous to the compressive strength (40 ) Was used.

For example, looking at the structure of the steel box-shaped bridge (1) with reference to Figure 2 to form a steel plate up and down, both side walls to weld the cross-sectional structure to form a rectangular shape, to maintain the rigidity on the top and bottom, both side walls Horizontal ribs 10, vertical ribs 11, and vertical and horizontal reinforcing materials 20 and 21 were fitted in a grid shape, and then welded.

Next, concrete 40 was filled in order to improve rigidity in the horizontal ribs 10 and the vertical ribs 11 installed on the lower plate.

However, the improved steel box type bridge 1 constructed as described above has the following problems.

First, due to the high noise caused by the driving vehicle, the pollution occurs in the downtown area.

Second, due to the large vibration, the fatigue of the bridge is relatively increased, resulting in a decrease in the service life.

Third, there are many welding defect elements as a structure made by cutting steel sheets and welding them respectively.

Fourth, the thickness of the member is composed of a thin steel plate and the stress is concentrated in the vertical and horizontal reinforcement may cause a large local buckling shape.

Local buckling as described above is a factor of deterioration of the safety of the bridge.

Fifth, because the width of the box and the length of the equipment is large, the stress loss caused by shear lag is large.

Sixth, it is inconvenient to handle and manage steel due to the large amount of steel and the use of different steels.

For example, the box as a main member uses high strength steel, and the horizontal and longitudinal ribs which are a couple material use low strength steel.

Seventh, the process of cutting welding inspection of each of the main member and the auxiliary member is very complicated.

Eighth, the coating management is difficult and the amount of coating is difficult due to the arrangement of the reinforcing material (vertical, horizontal rib and vertical, horizontal reinforcing material).

Ninth, the bridge span is used in the 50 ~ 60m span.

Tenth, the stiffness is small, sag and vibration is large, the user's psychological anxiety is inherent.

Eleventh, the rigidity of the bridge is high due to its low rigidity. (Based on 2.0 ~ 3.5m-50m long span)

The twelfth, horizontal and longitudinal ribs, vertical and horizontal reinforcement should be installed enough to function structurally.

Thirteenth, there is a hassle to install a lot of bulkheads every 5 meters to perform the torsional behavior of the box.

Fourteenth, the installation of the cross beem as much as 5m in order to distribute the load.

Fifteenth, the behavior of curved bridges and square bridges is unreasonable, resulting in deterioration of durability.

Sixteenth, it is difficult to increase rigidity and difficult to increase load capacity.

Seventeenth, when eccentric loads occur, the torsional behavior is complicated and the structural reinforcement is complicated because there are many reinforcements.

Eighteenth, bending, twisting and distortion may occur, so proper reinforcement is required.

Nineteenth, when the curvature is small, the initial shape of the abdominal plate is curved, so the buckling strength is greatly reduced.

Twentieth, the height of bridges is high, which leads to the rise of road height.

In order to solve the above problems, the present invention does not install a reinforcement like a conventional steel box type bridge, and in order to play the role of the reinforcement bridges by filling a filler such as concrete between the box of the bridge consisting of the outer box and the inner box The purpose is to improve the structural stiffness of and to exert its structural function without reinforcement by blocking local buckling.

In order to achieve the above object, the present invention is a steel box-type bridge made of steel, the steel box-type bridge is composed of an outer box and an inner box, and to install a plurality of protrusions and fastening members to maintain space therebetween In addition, by filling the filler between the two bridges characterized in that the structural rigidity of the bridge is improved.

It is characterized in that a plurality of protrusions are installed in the inner box to improve the binding force of the filler.

Injection holes for placing fillers on the upper plate of the outer box are formed at equal intervals, and filling the spaces between the two boxes, that is, outlets for discharging gas and air to prevent air accumulation generated during filling of the filling boxes. Characterized by forming a plurality on the bottom surface.

BRIEF DESCRIPTION OF THE DRAWINGS The features, and structural advantages, of the objects of the present invention described above will become more apparent from the description of the detailed and preferred embodiments of the present invention described below with reference to the accompanying drawings.

3 is a perspective view showing the present invention steel box-shaped bridge (1), Figure 4 is a view showing a plan view of the present invention steel box-shaped bridge (1), Figure 5 is a cross-sectional view taken along line AA 'of Figure 4, Figure 2 is a view showing a state filled between the outer box 100 and the inner box 200 of the double steel box girder bridge, Figure 7 is a PS steel wire (P) is inserted into the double steel box girder bridge using the present invention filler It is a figure which shows the state.

The present invention is a steel box-shaped bridge (1) made of steel, as shown in Figure 6, the steel box-shaped bridge (1) comprises an outer box 100 and the inner box 200, the space between them (S ) A plurality of protrusions 101 and a fastening member 300 are installed on the outer surface of the inner box 200 and the inner surface of the outer box 100 to strengthen the holding and binding force, and the upper box of the outer box 100. Injection holes 131 are formed at equal intervals in the central portion and both sides of the plurality of discharge holes are formed on the bottom surface of the inner box 200 and the filler 400 between the outer box 100 and the inner box 200. The technical construction features are given to improve the structural stiffness of the bridge.

When the present invention having the basic configuration as described above with reference to the drawings in more detail the configuration and assembly method as follows.

As shown in FIG. 3, the outer box 100 is steel plate cut into a lower plate 110, two side plates 120 and 120, and an upper plate 130, and the plates 110 and 120 and 130, respectively. A plurality of protrusions 101 are fused to one surface in advance and installed.

At this time, the protrusion 101 is a plurality of welding bolts (stutt bolts), in addition to the hole by using a drill, it may be fastened using a bolt.

In addition, the upper plate 130 is formed with an injection hole 131 for filling the filler 400 and a hole 132 for inserting the fastening bolt 500.

Therefore, after the two side plates 120 and 120 are erected on both edges of the lower plate 110 cut as described above, the welding is performed using a welder.

Next, in order to manufacture the inner box 200, as shown in FIG. 3, in the state where the hole 201 is formed at the same position as the hole 132 formed in the upper plate 130, the outer box ( After bending in a substantially "c" shape to a size smaller than the lower plate 110 of 100, the blade 220 is formed on the upper end of both side plates 210 of the inner box 200.

When the blade 220 is difficult to bend according to the thickness of the steel sheet is formed by cutting the cutting portion 202 by 3 ~ 5m, a plurality of protrusions 101 are fusion-installed on one surface of the inner box 200.

At this time, the surface on which the plurality of protrusions 101 are formed to protrude toward the outer side, that is, the outer box 100.

In addition, the lower plate 240 of the inner box 200 is formed with a discharge port 212 to prevent the accumulation of air generated during the filling of the filler 400.

Next, by placing the upper screen plate 230 on the upper end of both side plate 210 of the inner box 200, as shown in Figure 5, both ends of the upper and lower welds.

Next, the inner box 200 formed as described above is positioned on the upper plate 130 of the outer box 100, and then fastened by using the bolt 500 and the nut 510.

On the other hand, the two side plates 210, the lower plate 240 and the upper cover plate 230 of the inner box 200 or drilled a plurality of holes 211 for fastening the fastening member 300 in advance, or when construction It may be drilled with a drill.

Next, in an integrated state with the top plate 130 of the outer box 100 as described above, turn over the top of both side plates 120, 120 of the outer box 200 to form an approximately "C" shape upside down , Weld (W).

Next, through the holes 211 formed in the lower 240 and both side plates 210 and the upper screen plate 230, the fastening member 300 is formed on both sides of the outer box 100 and the upper and lower plates 130. To 110).

At this time, the fastening member 300 uses a tie bolt.

In addition, a diaphram 600 is installed at both ends of the outer box 100 so that the contractor can perform repair work.

In addition, as shown in Figure 7, the tube 800 for inserting the P. S steel wire (P) for increasing the load capacity of the bridge is inserted.

As described above, the steel box-shaped bridge 1 having a double structure is transported to a city factory and then placed on a pier using a crane or the like.

Next, as shown in FIG. 6 in the state as shown in FIG. 5, the filler 400 is hardened by filling through the injection hole 131 formed in the upper plate 130.

The filler 400 is mainly concrete mortar, and other materials having high strength may be used.

The construction sequence is the same as the existing method, after placing the steel box type on the alternating and pier phases and pouring the filler (see Fig. 4).

Next, the joint method of the steel box bridge 1 and the other steel box bridge 1 'is shown in FIG. 8A or 8B, using the fastening bolt 500 and the nut 510 to the inner box 200. And there is a method of connecting the outer box 100 in a batch.

For example, between the outer box 100 and the outer box (100 '), the inner box 200 and the inner box 200' for connecting the connection reinforcing plate 150 as a joint bolt 500 and There is a method of fastening with the nut 510.

As another connection method, as shown in Figure 9a or 9b, the outer box 100 is fixed using the fastening bolt 500 and the nut 510, the inner box 200 is directly welded in the field There is a way.

As another connection method as shown in Figure 10a or 10b, the outer box 100 in the field using the fastening bolt 500 and the nut 510 to converge the total stress of the steel box girder bridge (1) , Weld the reinforcement ribs 160 having a plurality of holes formed in the inner box 200, and fasten by using the fastening bolt 500 and the nut 510.

Next, by filling the outer box 100 and the inner box 200 with the filler 400, the construction is finished.

11 is another embodiment of the double steel box girder bridge using the present invention, all the structure is the same as the present embodiment, except that the blades 220 formed on both side plates 210 of the inner box 200 is formed inwardly The assembly was excellent, and the protrusion 101 was used as a bolt and a welding bolt (stud bolt).

Figure 12 is a view showing another embodiment of the double steel box girder bridge using the present invention, all structures are the same as the present embodiment, except that the inner box 200 on both sides of the lower plate 230 on the lower plate (210) Fixing by welding, the L-shaped grating plate 520 is placed on both sides of the plate 210 and then fastened using welding and bolts and nuts, and the upper plate of the outer box 100 on the grating plate 520 ( 130) put up and fasten using bolts and nuts, then weld.

The present invention described above has been described based on the embodiments based on the illustrated drawings, but is not limited thereto, and various modifications may be made without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is obvious that variations and modifications are possible, as well as other embodiments that are equivalent.

As described above, the present invention can achieve the following effects by pouring a filler such as concrete between the two boxes of the bridge consisting of the outer box and the inner box.

First, by using concrete, rubber, plastic, urethane, etc. as a filler, it is easy to install in any place, such as downtown area because of excellent noise absorption capacity.                     

Second, due to the increased rigidity, less vibration can reduce the fatigue of the bridge can increase the life.

Third, the welding amount can be reduced by about 70% can significantly reduce the weld joint.

Fourth, it is made of a double steel box type, and since the filling material is placed therebetween, it becomes a composite member, so the rigidity is large and there is no local buckling phenomenon.

Fifth, the leaf phenomena can be prevented and the stress loss can be reduced.

Sixth, by reducing the amount of steel and using a kind of steel, it is easy to handle and manage the steel.

Seventh, steel sheet cutting and bridge production are convenient and welding inspection is simple.

Eighth, the filler is inserted between the bridge of the double structure, the corrosion protection effect is great.

Ninth, the bridge can be extended.

For example, if the height of the double bridge is about 3.0m, it can be extended about 100 ~ 150m, and the height of the height due to the increase of rigidity can be reduced as much as possible.

Tenth, the rigidity is increased and the filling function can reduce sagging and vibration to a minimum, thereby providing psychological stability.

Eleventh, there is no need to install horizontal, vertical ribs and vertical and horizontal reinforcement materials as in the prior art, which is very convenient to manufacture, and there are few defects due to welding, and the amount of steel is reduced, thereby increasing economic efficiency.

Twelfth, the resistance is excellent even in the irregular shape of curves and square bridges.

Thirteenth, even when the curvature is small, the buckling strength of the member does not decrease.

Fourteenth, no warping, twisting or distortion occurs.

Claims (9)

In the double steel box bridge made of steel, The steel box bridge consists of an outer box and an inner box, and a plurality of protrusions and fastening members are installed on the outer surface of the inner box and the inner surface of the outer box in order to maintain the space therebetween and strengthen the binding force. Injection holes are formed at equal intervals on the center and both sides of the box top plate, and a plurality of outlets are formed on the bottom surface of the inner box so that filler is poured between the outer box and the inner box. Box bridge. delete delete The method of claim 1, The inner box forms both side plates on both sides of the lower plate and forms wings at the upper ends of both side plates, and at the center of the wing, a hole is formed at the same position as the hole formed in the upper plate and is formed by the upper plate, the bolt and the nut. Double steel box-shaped bridge using the filler, characterized in that the upper shielding plate is coupled to the inside of the two side plates. The method of claim 1, Double steel box-shaped bridge using a filler, characterized in that the tube for inserting the P.S steel wire is installed in the inner box. delete delete delete delete

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