KR100646208B1 - Steel Plate Girder Structure for Reduction of Noise and Vibration - Google Patents

Abstract

The present invention is to provide a noise and vibration reduction plate girder bridge structure, which is advantageous for the dynamic behavior of the bridge, fatigue resistance capacity and noise reduction by supplementing the disadvantages of the conventional railway bridge girder bridge, plate made of I-shaped cross-section steel A girder comprising: a plate girder including an abdomen having an inner space S formed on the upper surface of the lower flange and an upper flange formed to close the upper abdomen; And a slab installed across the upper flange upper surface of the plate girder and integrally installed on the plate girder upper surface or separated on each plate girder, the slabs being connected to each other by a connecting member when the plate girder is installed separately. do.

Railway bridge, plate-shaped bridge, plate girder bridge

Description

Steel Plate Girder Structure for Reduction of Noise and Vibration

1 shows a side view of a plate girder bridge used in a conventional railway bridge.

2A and 2B show side views of the plate girder bridge of the present invention.

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

100: plate girder bridge 110: plate girder

111: lower flange 112: abdomen

112: a, 112b: double plate 113: upper flange

114: tie 115: lightweight concrete

116: reinforcing material 120: slab

121: steel box 122: weightless concrete

130: rubber pad 140: sleeper

150: rail

The present invention relates to a noise and vibration reduction plate girder bridge structure. More specifically, it relates to a steel plate girder bridge used in railway bridges.

The plate girder bridge (plate type bridge), which currently occupies about 40% of the domestic railway bridges (about 1000 places), is a bridge type that lags considerably behind modern advanced bridge types. The shape of the plate girder bridge is a very simple structure of connecting two steel plate girder 10 of the I-shaped cross-section as the bracing material 20, as shown in Figure 1, the upper surface of the sleeper 30, such as timber rail is installed This is installed.

However, in the case of the plate girder bridge, first, there was a problem that the vibration is severe as a lightweight structure, second, the vibration of the abdomen, especially in the steel plate girder is severe, resulting in high noise, third, vulnerable to fatigue and impact, various cracks Fourth, it was pointed out that there may be a problem in the lateral distribution of live load because it is installed as a structure without a bottom plate as a girder bridge.

It is an object of the present invention to provide a plate girder bridge structure which is advantageous to the dynamic behavior characteristics of the bridge, fatigue resistance and noise reduction by supplementing the disadvantages of the conventional railway bridge girder bridge.

The present invention, in order to achieve the above technical problem, in the plate girder bridge for railway bridges supported by steel plate girders, plate girder made of I-shaped cross-section steel, treated with a double partition on the upper surface of the lower flange 111, the internal space ( A plate girder 110 including an abdomen 112 formed with S) and an upper flange 113 formed to close the upper abdomen; a slab 120 installed across an upper surface of the upper flange 113 of the plate girder; It was included.

Hereinafter, the plate girder bridge structure according to the present invention will be described in detail with reference to the embodiment shown in the drawings.

Figure 2a shows an embodiment of the plate girder bridge structure of the present invention, Figure 2b shows a modification thereof.

The plate girder 110 is installed to be supported on the bridge substructure 200, ie, the bridge or the upper surface of the bridge, and is supported by the bridge support 210 (Shoe) to be supported on the upper surface.

The plate girder 110 is manufactured by welding a steel plate such that the lower flange 111, the abdomen 112, and the upper flange 113 are formed in an I-shaped cross section as a whole, and then mount the upper surface of the bridge lower structure 200. It is common to install.

The abdomen 10 of the conventional plate girder bridge is composed of a single vertical plate for transferring the load of the upper flange to the bottom as shown in FIG. At this time, when the railway load acts, local vibration occurs in the vertical plate constituting the abdomen, and the abdomen itself becomes a path for transmitting noise, and noise is greatly generated due to the abdominal vibration. In the present invention, such an abdomen is installed in the form of double plates 112a and 112b so that the internal space S is naturally formed, and concrete is filled therein.

The basic function of this filled concrete is to control the vibrations of the abdomen. That is, when the load is transmitted to the abdomen by the railway load, the filled concrete can prevent the occurrence of noise due to the abdominal vibration through the function of restraining the double partition in the transverse direction, that is, the double plate, that is, the abdomen does not vibrate will be.

Another function of filled concrete is that it attaches to the concrete inside the double diaphragm, greatly reducing the risk of local buckling in the abdomen. Conventional plate girder bridge is to attach the stiffener (20, Stiffener) to the abdomen as shown in Figure 1 in order to prevent such local buckling. In this case, cracks are easily generated due to fatigue problems in the weld. However, in the present invention, the abdomen is already attached to the concrete filled therein, and if the additional tie bar 114, the connecting member between the double partitions, there is no risk of local buckling even without installing the reinforcement on the outside. Therefore, it is not necessary to weld the reinforcement, thereby reducing the construction cost, and is advantageous in the fatigue problem. Accordingly, the tie bar may be installed by tightening bolts and nuts on the inner or outer surface of the abdomen through the abdomen of the bar-shaped connecting rod, and may be efficiently installed on the outer surface of the abdomen by zigzag.

At this time, when filling the interior space (S) by the double plate with concrete, there is a possibility that the self-weight increases too much together with the bare concrete of the slab to be described later, the use of lightweight concrete 150 is preferable, the concrete of the present invention After inserting the pre-assembled reinforcing bar assembly not shown in the inner space, there is an advantage that the abdomen itself can act as a structural member to resist the load when the concrete is filled.

The plate girder 110 of the present invention is completed by installing a lower flange and an upper flange on the upper and lower surfaces of the abdomen to close the abdomen.

The bottom plate 120 transfers the live load of the upper part of the plate girder to the lower portion and corresponds to a configuration for dispensing. The bottom plate 120 is made of a closed steel box and installed by bolts or welding on the upper surface of the plate girder 110.

The bottom plate 120 is resistant to longitudinal and lateral displacement due to the railway load, which is borne by the steel box 121, the steel box is also filled with concrete, the concrete-free concrete 122 is used do.

The rootless concrete 122 poured into the steel box prevents local deformation and buckling of the steel box 121. In addition, the concrete helps to reduce noise generated when the railroad vehicle runs, such as being poured on the abdomen. Of course, the steel box may not be filled with concrete, but if the bridge is made of steel alone, it can be vulnerable to vibration because it becomes a lightweight structure like the existing plate-shaped bridge, so it becomes more advantageous in the vibration problem by increasing the slab weight as concrete. Can be.

At this time, the concrete bound by the steel box does not need to reinforce the concrete with reinforcing bars or reinforcing assemblies, such as the abdomen.

The construction method may be installed by first installing a steel box with an open upper surface on the upper surface of the plate girder, placing concrete and then installing a steel box upper plate, or forming a through hole in the upper portion of the steel box to penetrate the steel box. After filling concrete into the ball, the through hole may be closed.

The upper surface of the plate girder 110 is connected by the steel box 121 which is the slab 120, so that no relative displacement occurs.

However, since the lower part of the plate girder may have a relative displacement without a special connecting member, it is possible to further install a straight or X-shaped bracing member 116 on the lower part of the plate girder, which prevents the relative displacement between the plated girder It has the function of increasing the torsional rigidity of the entire bridge.

The modified example of the present invention shown in FIG. 2B is not installed on the plate girder upper surface by integrally forming the slab, but divided into two and installed on the upper surface of each plate girder.

In the case of manufacturing the slab integrally, if the spacing between the plate girders is increased, the construction, transportation and installation of the slab may be inferior in workability, so that at least two of them are installed on the upper surface of the plate girders.

After installing the rubber pad (130, Rubber Pad) on the bottom plate, the concrete or wood sleeper 140 is installed on the upper surface, and the rail 150 is installed on the upper surface of the sleeper.

The rubber pad 130 can secure the elastic restoring force in the lateral displacement can be expected to resist the horizontal vibration.

At this time, the sleeper 140 is manufactured in one piece in the case of Figure 2a, in the case of Figure 2b is also sewn in a separate type, in the case of the production of the separate type to install a connecting member therebetween to secure its integrity. To be able.

The plate girder of the present invention is advantageous in reducing vibration and noise, and can solve the problems of the conventional lightweight plate girder by the concrete weight filled in the steel box and the abdomen filled in the steel box as a slab, which is advantageous in terms of the generation of bridge acceleration, The installation of the bottom plate facilitates the lateral distribution of the load, and there is no risk of local buckling of the steel plate because the steel box and the abdomen are filled with concrete, and the concrete prevents the local deformation of the abdomen. And, as a whole, the weight is lighter than PC concrete bridge or concrete slab bridge, crane operation is advantageous.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (4)

In the plate girder bridge for railway bridges supported by steel plate girders, A plate girder made of an I-shaped steel, comprising: a plate girder which is treated as a double partition on an upper surface of a lower flange and an upper flange formed to close the upper surface of the abdomen having an inner space S formed thereon; And It is installed across the upper surface of the upper flange of the plate girder, is integrally installed on the plate girder or separately installed on the upper surface of each plate girder, when the separated installation is connected to each other by a connecting member; Noise and vibration reduction plate girder bridge structure. The noise and vibration reduction plate girder bridge structure according to claim 1, wherein a tie bar is further provided on the abdomen so as to penetrate the internal space S formed by the double partition wall in a transverse direction. According to claim 1 or 2, wherein the slab is made of a closed steel box, the concrete is further filled inside the steel box, and the bracing material is further installed in the horizontal or X-shape between the plate girder. Noise and vibration reduction plate girder bridge structure. According to claim 1 or 2, wherein the concrete is further cast in the interior space (S), the concrete is lightweight concrete, when cast in reinforced or reinforced concrete, when the reinforced concrete is embedded in the reinforced concrete Noise and vibration reduction plate girder bridge structure, characterized in that the abdomen acts as a structural member by first inserting into the space and then placing concrete.

Images