JP3984782B2 - Expansion joint for bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an expansion joint for connecting structures having seam intervals in a bridge.
[0002]
[Prior art]
When constructing a bridge, as a method of connecting structures such as abutments and bridge girders, a connection method such as no-joint connection or girder connection is known. According to this connection method, even when the bridge girder expands or contracts due to a change in air temperature, the connection portion absorbs the displacement of the structure and can prevent the bridge from being damaged.
[0003]
On the other hand, for bridges where the above connection method cannot be used due to structural problems or the like, a method of absorbing a displacement due to expansion and contraction of the structure by providing a gap at the joint of the structure is known. A steel comb joint is known as a joint for connecting structures having a seam interval.
[0004]
The comb joint has an uneven surface that forms a comb shape in plan view, and a pair of identical joints are used in combination. That is, the convex portions of one joint are combined and connected so as to fit into the concave portions of the other joint. According to this comb-shaped joint, when a pair of joints are combined, the concave and convex surfaces of each joint are connected so as to open a slight gap, and the bridge is prevented from being damaged by absorbing the displacement of the bridge girder in this gap. it can.
[0005]
[Problems to be solved by the invention]
However, the comb joint has a problem that it is large and heavy due to its shape characteristics, and installation work is difficult. In addition, because of the structural characteristics, the gap between the concave and convex portions is limited from the safety in traveling of the motorcycle, so that it cannot be used for a bridge having a large displacement and the allowable amount for horizontal movement in the bridge width direction is extremely small. There was a problem of becoming.
[0006]
By the way, in the past, when the length of the bridge was increased, the support had become a technical problem. However, in recent years when the development of rubber bearings has progressed, countermeasures have been taken to the technical problems of the support. . And it became possible to construct a long-span bridge and increase the connection length in girder connection, and there was a demand to extend the application range of joints to long bridges such as long-span bridges.
[0007]
Accordingly, an object of the present invention is to provide a bridge expansion joint that is excellent in installation workability and can be applied to a long bridge.
[0008]
[Means for Solving the Problems]
The expansion joint of the first bridge according to the present invention comprises an expansion / contraction body in which a male member and a female member are slidably fitted, and the male member and the female member are opposed to each other while maintaining a seam interval. Separately, the free end of the male member is in the female member even at the maximum dimension of the joint interval, and is pivotally connected by a pin member.
[0009]
The expansion joint follows the expansion or contraction of the structure due to a change in temperature by sliding the male member against the female member. Moreover, the male member and the female member follow the swing in the width direction of the bridge during the earthquake (the direction perpendicular to the bridge axis on the bridge surface) by swinging with the pin member as a support shaft. Therefore, it is possible to prevent the structure from expanding and contracting due to temperature changes and damage to the bridge due to shaking during an earthquake.
[0010]
Furthermore, since it has a simple structure consisting of a male member and a female member, it is possible to reduce the size and weight, improve the workability, and change the cross-section and length of both members. It is possible to cope with a wide range of bridges including a long bridge by a simple change such as changing the length inserted into the member.
[0011]
The female member may be a cylindrical body that is open on at least the male member side.
In this case, by making the female member hollow, the stretchable body can be reduced in weight and the workability can be further improved.
[0012]
The expansion joint of the second bridge according to the present invention comprises a pair of male members each having a telescopic body slidably fitted to both ends of the cylindrical female member whose both ends on the axis are open. The pin member is configured such that the free end of the male member is in the female member even when the maximum dimension of the seam interval is provided in each of the one structure and the other structure facing each other while maintaining the seam interval. Connect with swingable.
In this case, since the length of the stretchable body can be adjusted at both ends, construction workability can be further improved.
[0013]
A plurality of the stretchable bodies may be provided side by side in the bridge width direction, and the upper surfaces of the plurality of stretchable bodies may be covered with a sheet-like member that is laid between the one and the other structures.
In this case, the joint interval of the structure can be completely closed. Therefore, traveling safety can be improved without the tire of the motorcycle being taken in the gap. Moreover, no matter where the vehicle passes in the width direction of the bridge, it is possible to prevent the generation of noise such as tire sound and impact sound. Furthermore, it is possible to prevent rainwater from entering through the gap between the joints of the structure, and to reduce the time and cost required for repairing corrosion.
[0014]
A sliding sheet may be interposed between the male member and the female member.
In this case, the frictional resistance generated when the male member slides with respect to the female member is reduced, and the stretchable body can be smoothly expanded and contracted.
[0015]
A cushioning material may be laid between the female member and the one and other structures.
In this case, it is possible to buffer the impact generated when the vehicle passes and prevent the breakage of the joint and the generation of noise.
[0016]
The one structure may be an abutment, and the other structure may be a bridge girder.
In this case, an expansion joint can be provided between the abutment and the bridge girder.
[0017]
The one and other structures may be bridge girders.
In this case, an expansion joint can be provided between the bridge girders.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show specific examples of the first expansion joint according to the present invention. 1 is an enlarged plan view showing a state where the expansion joint is used, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is taken along the line BB in FIG. FIG. 4 is a schematic view of the bridge showing the position where the expansion joint is used.
[0019]
As shown in FIG. 4, the expansion joint 10 is used in a connecting portion 1 that connects an abutment 3 and a bridge girder 4 in a bridge 2. The bridge girder 4 is installed at a seam interval 6 with respect to the abutment 3 so that the bridge 2 as a whole can follow the expansion of the bridge girder 4 due to temperature changes. Further, stepped portions 7 and 7 extending in the width direction of the road are formed at opposite corners of the abutment 3 and the bridge girder 4, and the connecting portion 1 is provided between the stepped portions 7 and 7.
[0020]
Further, a pavement 5 is laid on the bridge 2, and the upper portion of the connecting portion 1 forms a uniform surface with the pavement 5 so that no gaps or steps are formed between the connecting portion 1 and the pavement 5.
[0021]
The expansion joint 10 includes a male member 12 and a female member 13 of a telescopic body 11 slidably fitted with a male member 12 and a female member 13, which are connected to the abutment 3 and the bridge girder 4 by a pin member 14 so as to be swingable. It has become. Here, the free end of the male member 12 is in a state inside the female member 13 even at the maximum dimension of the joint interval 6.
[0022]
The distal end portion of the pin member 14 is fixed to a reinforcing plate 8 fixed to the step portions 7 and 7 via anchor bolts 9a.
[0023]
According to the expansion joint 10, the male member 12 can follow the expansion or contraction of the bridge girder 4 due to a change in temperature by sliding the female member 13 with respect to the female member 13. When the bridge 2 swings in the width direction at the time of the earthquake, the male member 12 and the female member 13 swing with respect to the bridge girder 4 and the abutment 3 with the pin member 14 as a support shaft, and the bridge 2 swings. Can follow.
[0024]
Furthermore, since it is a simple structure consisting of the male member 12 and the female member 13, it is possible to reduce the size and weight and improve the workability.
[0025]
Furthermore, by changing the cross-section of both members 12 and 13, the thickness of the bridge girder 4 can be accommodated, or the length of both members 12 and 13 or the length at which the male member 12 is inserted into the female member 13 can be changed. It is possible to cope with a wide range of bridges including a long bridge with a simple change without making a major design change such as being able to cope with the size of the interval 6.
[0026]
The female member 13 has a box shape as a whole, a hole through which the pin member 14 is inserted is provided on one end side, and the other end portion is open. A male member 13 having a plate shape as a whole is inserted into the opened end portion so that an end portion in which a hole for inserting the pin member 14 is formed protrudes.
[0027]
If it carries out like this, since the female member 13 was made hollow, the expansion-contraction body 11 can be reduced in weight, and construction workability | operativity can be improved.
[0028]
In the present invention, the cross-sectional shape is not limited as long as it is hollow, and it may be cylindrical, prismatic or the like in addition to the box shape described above.
[0029]
5 and 6 show specific examples of the second expansion joint according to the present invention. FIG. 5 is an enlarged plan view showing a state where the expansion joint is used, and FIG. 6 is a cross-sectional view taken along the line CC in FIG.
[0030]
The expansion joint 20 is formed by sliding the expansion body 11 in the expansion joint 10 into a pair of male members 12 and 12 on both ends of a cylindrical female member 23 whose both ends on the axis are open. The pair of male members 12 and 12 are connected to the abutment 3 and the bridge girder 4 separately by a pin member 14.
[0031]
According to the expansion joint 20, the length of the expansion body 21 can be adjusted at both ends, so that the workability can be improved.
[0032]
A plurality of the stretchable bodies 11 or 21 are arranged side by side in the bridge width direction of the bridge 2, and the upper surfaces of the plurality of stretchable bodies 11 or 21 are covered with a sheet-like member 17 installed between the abutment 3 and the bridge girder 4. ing.
[0033]
The sheet-like member 17 is fixed to the abutment 3 and the bridge girder 4 through anchor bolts 9b placed at regular intervals in the width direction of the bridge 2 at both ends extending in the width direction of the bridge 2, and steps and A gap is not formed. As the sheet-like member 17, for example, a rubber sheet can be used.
[0034]
In this way, the joint interval 6 between the abutment 3 and the bridge girder 4 can be completely closed. Therefore, traveling safety can be improved without the tire of the motorcycle being taken in the gap. Moreover, no matter where the vehicle passes in the width direction of the bridge, it is possible to prevent the generation of noise such as tire sound and impact sound. Furthermore, rainwater intrusion from the gap between the abutment 3 and the bridge girder 4 can be prevented, and the time and cost required for repairing corrosion can be reduced.
[0035]
Moreover, the sealing material 18 is laid under the expansion-contraction body 11 or the expansion-contraction body 21, and the rainwater permeation prevention effect is heightened.
[0036]
A sliding sheet 16 is interposed between the male member 12 and the female member 13 or the female member 23.
[0037]
If it carries out like this, the frictional resistance which generate | occur | produces when the male member 12 slides with respect to the female member 13 or the female member 23 will be reduced, and the expansion-contraction body 11 or the expansion-contraction body 21 can be extended-contracted smoothly. As the sliding sheet, for example, a Teflon processed sheet can be used.
[0038]
A cushioning material 15 is laid on the portion where the female member 13 or the female member 23 contacts the plate 8, the abutment 3 or the bridge girder 4.
[0039]
If it carries out like this, the impact which generate | occur | produces when a vehicle passes the pavement 5 is buffered, and breakage of a joint and generation | occurrence | production of noise can be prevented.
[0040]
In any of the above specific examples, the case where the abutment 3 and the bridge girder 4 are connected as a structure is shown. However, the structure is not limited as long as it is within the range used for the bridge. Can also be used.
[0041]
【The invention's effect】
According to the expansion joint of the present invention, an expansion body is formed by slidingly fitting a male member and a female member, and the male member and the female member are separately connected to one structure and the other structure that face each other. Therefore, the male member follows the sliding or sliding of the female member against the expansion or contraction of the structure due to the temperature change. In addition, since the male member and the female member are connected to the structure by a pin member so as to be swingable, the male member and the female member can be swung in the width direction of the bridge (the direction perpendicular to the bridge axis on the bridge surface). The member follows the structure by swinging around the pin member as a support shaft. Therefore, it is possible to prevent the structure from expanding and contracting due to temperature changes and damage to the bridge due to shaking during an earthquake.
[0042]
Furthermore, since it has a simple structure consisting of a male member and a female member, it is possible to reduce the size and weight, improve the workability, and change the cross-section and length of both members. It is possible to cope with a wide range of bridges including a long bridge by a simple change such as changing the length inserted into the member.
[0043]
According to claim 2, by making the female member hollow, the stretchable body can be reduced in weight, and the workability can be further improved.
[0044]
According to the third aspect, since the length of the stretchable body can be adjusted at both ends, construction workability can be further improved.
[0045]
According to the fourth aspect, since the joint interval between the structures is completely closed, the traveling safety of the vehicle is improved, and the generation of noise such as tire sound and impact sound can be prevented. Furthermore, it is possible to prevent rainwater from entering between the joints of the structure, and to reduce the time and cost required for repairing corrosion.
[0046]
According to the fifth aspect, the frictional resistance generated when the male member slides with respect to the female member is reduced, and the stretchable body can be smoothly expanded and contracted.
[0047]
According to the sixth aspect, it is possible to buffer the impact generated when the vehicle passes and prevent the joint from being damaged and noise.
[0048]
According to the seventh aspect, the expansion joint can be disposed between the abutment and the bridge girder.
[0049]
According to the eighth aspect, the expansion joint can be disposed between the bridge beams.
[Brief description of the drawings]
FIG. 1 is an enlarged plan view showing a state in which a first expansion joint according to the present invention is used.
2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a cross-sectional view taken along the line BB in FIG.
FIG. 4 is a view showing a place where the expansion joint is used in a bridge.
FIG. 5 is an enlarged plan view showing a state in which the second expansion joint according to the present invention is used.
6 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Connection part 2 Road bridge 3 Abutment 4 Bridge girder 5 Pavement 6 Joint space | interval 7 Level | step difference 8 Plate 9a, 9b Anchor bolt 10 1st expansion joint 11, 21 Expansion body 12 Male member 13, 23 Female member 14 Pin member 15 Buffer 16 Sliding sheet 17 Sheet-like member 18 Sealing material 20 Second expansion joint

Claims (8)

The elastic member (11) is formed by slidingly fitting the male member (12) and the female member (13), and the male member (12) and the female member (13) are opposed to each other while maintaining the seam interval (6). Each of the structure (3) and the other structure (4) has a free end of the male member (12) in the female member (13) even at the maximum dimension of the seam interval (6). An expansion joint for a bridge, characterized in that it is pivotably connected by a pin member (14). The expansion joint according to claim 1, wherein the female member (13) is a cylindrical body that is open at least on the male member (12) side. A pair of male members (12) is formed into a telescopic body (21) slidably fitted to both ends of the cylindrical female member (23) whose both ends on the axis are open, and the pair of male members (12), Separately between the one structure (3) and the other structure (4) facing each other while maintaining the seam interval (6), the free end of the male member (12) is at the maximum dimension of the seam interval (6). The expansion joint of the bridge is characterized in that it is in a state of being in the female member (23) and is pivotally connected by the pin member (14). A plurality of the stretchable bodies (11 or 21) are arranged side by side in the bridge width direction, and the upper surface of the plurality of stretchable bodies (11 or 21) is installed between the one and the other structure (3,4). The expansion joint for bridges according to claim 1, 2 or 3, which is covered with a member (17). The expansion joint for bridges according to one of claims 1 to 4, wherein a sliding sheet (16) is interposed between the male member (12) and the female member (13 or 23). The expansion joint for a bridge according to any one of claims 1 to 5, wherein a cushioning material (15) is laid between the female member (13 or 23) and the one and the other structure (3,4). . The expansion joint for a bridge according to one of claims 1 to 6, wherein the one structure (3) is an abutment and the other structure (4) is a bridge girder. The expansion joint for a bridge according to one of claims 1 to 7, wherein the one and the other structures (3,4) are bridge girders.

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