JP3621291B2 - Expansion joint structure of bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of an expansion joint for a bridge, and more specifically, such as an expansion joint for a bridge or an expansion joint for a bridge for a long-span bridge when securing a large gap (joint) between bridge bodies in order to improve earthquake resistance. The present invention relates to a joint structure having a large clearance.
[0002]
[Prior art]
In recent years, plans for earthquake resistance have increased in the construction of railways and road bridges. As an example, measures such as increasing the number of bridge girder in order to avoid the fall of the bridge girder during an earthquake have been taken. When the bridge girder becomes longer, the displacement (horizontal movement) of the bridge girder ends inevitably caused by temperature changes and earthquakes will increase. Therefore, there is a possibility that the bridge may become unusable due to the bridge girder and chest wall damage due to collision between the bridge girders and collision between the end of the bridge girder and the abutment chest wall (parapet). . On highways and the like, a multi-girder continuous girder with as few joints as possible is adopted as much as possible from the viewpoint of traveling at high speeds, and suspension bridges and long-span bridges such as the cable-stayed bridge 60 illustrated in FIG. 9 are constructed. ing. The cable-stayed bridge 60 is provided with a tower 62 on a pier 61 and supports a bridge body 64 with a cable-cable 63, and a joint 65 is provided between both ends of the bridge body 64 and the abutment 66. These long and large bridges also increase the expansion and contraction displacement of the bridge body due to temperature changes as described above due to the longer bridge girder, and in order to absorb the displacement, a large clearance between the bridge body and the abutment is secured. There is a need. When this gap becomes large, a device for maintaining the continuity between the bridge pavement and the pavement plate behind the abutment is required, and various structures have been developed.
[0003]
As an example of an expansion joint that is frequently used in response to such a demand, there is a comb expansion joint (finger joint) 71 shown in FIG. This is because the face plates 72 and 73 formed so that the left and right comb blades engage with each other in the horizontal plane between the notch between the upper end of the bridge girder 31 and the chest wall 54 of the abutment 51, are formed. 75 is fixed to the structure (the bridge girder 31 and the abutment 51) with a filling mortar 76 and is installed flush with the upper surfaces of the paving plates 32 and 42. 77 is a drainage basin. The comb expansion joint 71 absorbs a change in the gap 52 due to the expansion and contraction of the bridge girder 31 by the overlap of the face plates 72 and 73, and ensures the continuity of the paving plates 32 and 42. However, the joint 71 of this structure also requires a structurally strong one when the clearance increases, it also increases in shape, requires a large notch at the end of the spar, and causes a problem of strength of the spar.
[0004]
[Problems to be solved by the invention]
As mentioned above, recently, damage to the bridge due to collision between the bridge girder and the opposite structure due to displacement of lower structures such as abutments and piers during an earthquake has been avoided, and expansion and contraction due to temperature changes of the bridge girder of the long-span bridge. Often, a wide gap (joint) is provided so that it can be absorbed. An object of the present invention is to develop an expansion joint for an improved bridge that covers this wide gap and is excellent in load resistance and vehicle running performance.
[0005]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and a plurality of girders made of H-section steel or I-section steel are provided between structures facing each other with a gap between the gaps of 400 mm to 800 mm. Cross over in parallel, fix one end of the girders to one of the structures, slidably support the lower surface of the other end of the girders to the other structure, and upper surface on the upper surface of the girders was placed on finished concrete version pavement flush, the one end of the concrete panel fixed to the one of the structure, the other end the lower surface of its slidably is supported on the other of the structure Furthermore, the bridge expansion and contraction structure is characterized in that a joint that moves in accordance with expansion and contraction of the play is extended to the other end of the concrete plate. In this case, the joint is preferably a comb joint in which the left and right comb blades mesh with each other in a horizontal plane. Here, as the girders, for example, a plurality of H-shaped steels or I-shaped steels may be arranged in parallel at intervals and installed between the structures.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The structure of the expansion joint of the present invention will be described below with reference to the drawings. The expansion joint of the present invention can be suitably used for a bridge between wide spaces.
[0007]
1 is a plan view of the embodiment, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is a view taken along the line BB in FIG. FIG. 1 shows from left to right a bridge pavement plate 32, a concrete slide plate 12 with a large number of H-beams arranged at the bottom, and then a comb joint 13 in which comb blades mesh. Yes. In the comb joint 13, the moving side finger 14 and the fixed side finger 15 form a comb shape and enter each other, and are movable with respect to each other.
[0008]
FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1 and is a vertical cross-sectional view showing a state in which the bridge girder 31 is contracted and the clearance 52 is maximum, and the bridge girder 31 supported by the slide support 53 of the abutment 51 and There is a gap 52 between the abutment chest wall 54, and the other end of the H-shaped steel beam 11 having one end hinged to the bridge girder 31 is supported by a sliding support portion 55 provided on the abutment chest wall 54. A concrete slide plate 12 is placed on the upper surface of the beam member 11, and the movable side of the comb joint 13 is extended to the other end of the slide plate 12. The abutment 51 is formed with a sliding support portion 55 on which the girder 11 and the slide plate 12 slide. As the bridge girder 31 extends, the movable side of the bridge girder 31, the girder 11, the slide plate 12, and the comb joint 13 is integrated. Move to.
[0009]
The comb joint 13 includes a moving side and a fixed side, and the fixed side is fixed to a pavement plate 42 on a pillow plate 43 provided on a backfilling roadbed back of the abutment 51 to prevent uneven settlement.
[0010]
The concrete slide plate 12 may be made of precast concrete, and is preferably a prestressed concrete plate into which prestress is introduced in the width direction. The slide plate 12 is supported by a large number of H-beams 11 to increase the resistance of the wheel load to the vehicle running on the bridge surface. Further, the comb expansion joint 13 includes the chest wall 54 and the pillow plate. Since it is directly supported by 43, it is possible to make it thin overall.
[0011]
3 is a cross-sectional view taken along the line BB in FIG. The girders are arranged at appropriate intervals in the width direction, and a cross-sectional view of a portion without the girders is shown. Other reference numerals are the same as those in FIG.
[0012]
4 is a cross-sectional view taken along the line CC of FIG. 1. The chest wall is provided with a fitting hole 56 into which the H-beam Girder 11 is fitted, and the sliding support portion 55 between the bottom surface of the Girder 11 is provided in the chest wall. A sliding board is installed.
[0013]
FIG. 5 is a view taken along the line DD in FIG. 2, and a girder material 11 is hinged to the upper side of the end of the bridge girder 31 supported by the slide support 53, and a concrete slide plate is formed on the upper surface of the girder material 11. 12 are placed and move together as the bridge girder 31 expands and contracts.
[0014]
6 and 7 are explanatory views showing the behavior of the expansion joint of this example due to the expansion and contraction of the bridge girder. FIG. 6 is a diagram when the bridge girder 31 has moved or contracted to the left as much as possible as indicated by the arrow 33, and FIG. 7 is a diagram when the bridge girder 31 has been moved in the right direction as indicated by the arrow 34. . The amount of movement can be about 400 mm to 800 mm. As a result, even if the abutment is displaced to the left due to an earthquake or the like, the end of the bridge girder 31 will not collide with the chest wall 54 and be damaged as long as it is within the range of 400 mm to 800 mm. On the other hand, when the abutment 51 is displaced in the right direction, the bridge girder 31 can be prevented from falling by the falling bridge prevention device 35 shown in FIG.
[0015]
FIG. 8 shows another embodiment in which the comb joint 13 is installed on the bridge girder 31, the girder 11 and the slide plate 12 are fixed to the abutment 51 side, and the sliding support portion 36 of the girder 11 and slide plate 12 is attached to the bridge girder 31. It is of the type provided.
[0016]
【The invention's effect】
In order to prevent collision between structures due to expansion / contraction due to temperature change of bridge girder of long-span bridge, displacement of support structure at the time of earthquake, horizontal movement, etc., when securing a large gap (joint) between structures, The girders are bridged between the structures facing each other, one end of the girders is fixed to one structure, and the lower surface of the other end of the girders is slidably supported by the other structure. A concrete plate fixed to the one structure on the upper surface and finished with the upper surface flush with the pavement surface is placed, and the lower surface of the other end of the concrete plate is slidably supported on the other structure, and the other end of the concrete is further supported. By extending the movable side of the comb-shaped expansion joint, the reinforcement effect of girders using H-shaped steel such as H-shaped steel placed on the bottom of the slide plate can be demonstrated. As a result, it is supported by the chest wall and pillow plate. The comb-type expansion joints made should be thin overall. Can be, even in joint of a bridge having a wide Joint Gap, it is possible to obtain an excellent expansion joint capable of resisting wheel load of the running vehicle.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is a view taken along arrow BB in FIG. 1;
4 is a view taken in the direction of arrows CC in FIG. 1. FIG.
FIG. 5 is a view taken along the line DD in FIG. 2;
FIG. 6 is an explanatory diagram showing expansion / contraction behavior.
FIG. 7 is an explanatory diagram showing expansion / contraction behavior.
FIG. 8 is an explanatory diagram of another embodiment.
FIG. 9 is an explanatory diagram of a cable-stayed bridge.
FIG. 10 is an explanatory view of a conventional expansion joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Expansion joint 11 Girder material 12 (H-shaped steel) 12 Slide plate 13 Comb joint 31 Bridge girder 32 Bridge pavement plate 33 Arrow 34 Arrow 35 Falling bridge prevention device 36 Sliding support part 42 Pavement plate 43 Pillow plate 51 Abutment 52 Free space 53 Slide support 54 Chest wall 55 Sliding support portion 56 Fitting hole 60 Cable-stayed bridge 61 Bridge leg 62 Tower 63 Cable-stayed cable 64 Bridge body 65 Joint 66 Abutment 71 Comb-type expansion joint (finger joint)
72, 73 Face plate 74 Web 75 Leg 76 Filling mortar 77 Drainage

Claims (2)

A plurality of girders made of H-shaped steel or I-shaped steel are bridged in parallel between structures facing each other with a gap between the gaps of 400 mm to 800 mm, and one end of the girder is one of the structures Fixed to the object, slidably supporting the lower surface of the other end of the girder on the other structure, and placing a concrete plate whose upper surface is flush with the paved surface on the upper surface of the girder, one end of the concrete is fixed to the one of the structure, the other end the lower surface of its slidably is supported on the other structure, further, in response to expansion and contraction of the Joint Gap to the other end of the concrete panel An expansion joint structure for bridges, characterized by extending joints that move relative to each other. The expansion joint structure for a bridge according to claim 1, wherein the joint is a comb joint.

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