JP5166333B2 - Telescopic device support structure - Google Patents

Description

  The present invention relates to a support structure for a telescopic device provided between a bridge girder and an abutment on a highway or a general road.

  In many cases, an expansion / contraction device is provided between the bridge girder at the end of the bridge and the abutment so as to allow expansion / contraction of the bridge girder. This expansion / contraction device is generally provided on both sides of the expansion / contraction gap between the bridge girder and the abutment, and even if the bridge girder expands / contracts due to temperature change, concrete creep or drying shrinkage, etc. The vehicle is maintained in a state where it can be safely driven.

  As described in Patent Literature 1, such a telescopic device is described in a so-called finger-type telescopic device in which steel members are provided so as to protrude from both sides of the telescopic play, and in Patent Literature 2. A telescopic device having a composite structure of such a rubber material and a steel material is generally known.

These telescopic devices are generally supported as shown in FIG.
The bridge girder 101 is supported on the abutment 102 via a support 103, and a notch is provided in the upper part of the end of the girder to fix one side of the telescopic device 104. On the other hand, the abutment 102 is provided with a parapet 105 so as to face the end face of the bridge girder 101 and resists the earth pressure of the embankment 106 backfilled on the back side. The side is fixed.

JP 2001-288707 A JP2007-9619

However, the structure of the portion where the telescopic device is supported has the following problems.
The telescopic device is waterproofed so that rainwater does not flow between the bridge girder and the parapet from the road surface, but it is waterproof due to repeated impacts by vehicles traveling on the road surface and deterioration over time. Many have been lost. When waterproofness is lost and rainwater or the like flows between the bridge girder and the parapet, the time for the end of the bridge girder and the upper part of the abutment to be wet increases. When exposed to rainwater or the like in this way, the progress of corrosion is accelerated when the bridge girder is made of steel. Also, in the case of concrete girders, corrosion of the reinforcing bars is likely to occur, and concrete is likely to deteriorate, and the concrete of the abutment may also be deteriorated in the same manner. For this reason, it may be necessary to take measures such as applying waterproof coating to the end of the bridge girder, the surface of the parapet facing the bridge girder, and the support surface of the support.

  This invention is made | formed in view of such a situation, The objective is the expansion / contraction apparatus which can prevent rain water etc. flowing down between a bridge girder and a parapet from the part in which the expansion / contraction apparatus was provided. It is to provide a support structure.

In order to solve the above-mentioned problem, the invention according to claim 1 is a support structure for a telescopic device provided between an abutment and a bridge girder supported on the abutment so as to be movable in the axial direction. Has a parapet that is raised to face the end face of the bridge girder and resists earth pressure on the back soil, and the bridge girder has a girder end overhanging portion of the concrete that projects from the top of the end face toward the parapet. The surface of the parapet facing the bridge girder is raised substantially vertically from the lower end, and the portion facing the beam end overhanging portion of the bridge girder is in a position retreated from the lower end to the back soil side, The upper part of the back soil side from the surface facing the beam end overhanging portion of the parapet serves as an expansion device receiving portion for supporting the expansion device, and from the surface facing the beam end overhanging portion of the parapet. On the bridge girder side , a drainage groove for draining to the side of the bridge girder is provided on the back soil side from the surface facing the lower part of the end face of the bridge girder of the parapet. Provided is a support structure for a telescopic device supported by a device receiving portion and installed so that rainwater flowing downward from the telescopic portion of the telescopic device flows into the drainage groove.

  By providing the above configuration, when rainwater or the like flows between the telescopic part of the telescopic device, that is, the part fixed to the bridge girder and the part fixed to the abutment, the rainwater is provided in the upper part of the parapet. It is prevented from flowing along the edge of the bridge girder or the surface of the parapet. Therefore, it is possible to reduce the exposure of the bridge girder and parapet concrete to rainwater and effectively prevent the occurrence of corrosion and deterioration.

  The invention according to claim 2 is the support structure for the telescopic device according to claim 1, wherein the drainage groove is formed in a size that allows an operator to pass in the drainage direction.

  In such a structure, the inside of the drainage yard can be cleaned, and even when sand or gravel flows along with rainwater from the road surface, it can be easily removed to maintain the function of the drainage groove. Therefore, it is possible to prevent rainwater and the like from overflowing from the drainage ditch and flowing down between the bridge girder and the parapet.

  The invention according to claim 3 is the support structure for the expansion / contraction device according to claim 1 or 2, wherein the girder end overhanging portion includes a concrete block formed so as to be integrated with the expansion / contraction device in advance. It is assumed that one end is fixed to the block and the other end is fixed to the bridge girder by the tension force of the tension material fixed to the bridge girder.

  In this support structure, it is possible to replace the expansion device in a short time by separating the concrete block by releasing the tension of the tension material and fixing the concrete block integrated with the new expansion device with the tension material. Become. In the conventional method of replacing the telescopic device, the concrete near the telescopic device is crushed, the telescopic device is removed from the bridge girder and the parapet, the new telescopic device is installed in place, and then the concrete is placed and fixed. . For this reason, it is necessary to block traffic for a long time for the work of crushing concrete or curing newly placed concrete. On the other hand, in this invention, it becomes possible to replace | exchange an expansion-contraction apparatus with a concrete block easily as mentioned above, and the time which interrupts | blocks traffic is shortened.

  The invention according to claim 4 is the support structure of the expansion / contraction device according to claim 1 or 2, wherein the abutment side of the expansion / contraction device includes a concrete block formed in advance so as to be integrated with the expansion / contraction device. It is assumed that one end is fixed to the concrete block and the other end is fixed to the abutment by a tension force of a tension material fixed to the abutment.

  In this support structure, the portion fixed to the upper part of the parapet of the telescopic device can be easily replaced in the same manner as in the invention according to claim 3, and the time for blocking the traffic to replace the telescopic device is shortened. The

  As described above, in the support structure of the telescopic device according to the present invention, rainwater or the like from the portion provided with the telescopic device is prevented from flowing between the bridge girder and the parapet and flowing down the end face of the bridge girder and the surface of the parapet. can do. Therefore, corrosion or deterioration of the bridge girder and abutment concrete is effectively suppressed. Further, by fixing the concrete block integrated with the expansion / contraction device to the bridge girder or the parapet with the tension of the tension member, the expansion / contraction device can be easily replaced with a short traffic interruption.

It is a schematic sectional drawing which shows the "support structure of an expansion-contraction apparatus" which is one Embodiment of this invention. It is an end view of the bridge girder shown in FIG. It is a side view of the edge part of the bridge girder shown in FIG. It is a schematic sectional drawing which shows the "support structure of an expansion-contraction apparatus" which is other embodiment of this invention. It is a schematic sectional drawing which shows the "support structure of an expansion-contraction apparatus" which is other embodiment of this invention. It is a schematic sectional drawing which shows the support structure of the conventional expansion-contraction apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a “supporting structure for a telescopic device” according to an embodiment of the present invention.
The telescopic device 4 is supported by the end portion of the bridge girder 1 made of concrete and the parapet 21 of the abutment 2 and allows relative displacement between them.
The bridge girder 1 is supported on the bridge girder support part 22 of the abutment 2 via the rubber support 3, and when the bridge girder 1 expands and contracts due to a temperature change, or when a horizontal force during an earthquake acts, The rubber support 3 is deformed to change the position of the end portion, and a relative displacement occurs between the rubber support 3 and the abutment 2.

  The abutment 2 has a reinforced concrete structure supported on the ground by a direct foundation or a pile foundation, and supports the end of the bridge girder 1 and resists the earth pressure of the embankment 5 on the back side. A wall-shaped parapet 21 facing the end face 11 of the bridge girder 1 is raised on the embankment side of the bridge girder support part 22 on which the bridge girder 1 is supported, supports the back soil above the bridge girder support part 22, and the upper part is a step One end of the plate 6 is supported. The tacking plate 6 is supported on the embankment at the other end, and the embankment 5 near the abutment is compacted to prevent a step from being generated on the road surface between the parapet and the embankment.

  In the upper part of the parapet 21, a portion adjacent to the position where the above-described tread plate 6 is placed serves as a telescopic device receiving portion 23 that supports the abutment side of the telescopic device. And, on the bridge girder side of the expansion device receiving portion 23, there is a bottom surface 24 at a position lower than the expansion device receiving portion 23, and a drainage groove 26 formed by raising a concrete wall 25 on the bridge girder side. Is provided. A drainage gradient is provided on the bottom surface 24 of the drainage groove 26 in a direction crossing the axis of the bridge girder 1, and rainwater or the like in the drainage groove 26 can be discharged to the side of the abutment 2. ing.

  On the other hand, the bridge girder 1 is formed with a concrete girder end overhanging portion 12 projecting from the upper part of the end surface 11 toward the drainage groove, and the girder end overhanging portion 12 supports the bridge girder side of the telescopic device 4. The girder edge overhanging portion 12 is sufficiently reinforced with a reinforcing bar so as to withstand a wheel load acting on the beam end, and prestress can be introduced as necessary. The leading end surface 12a of the girder end overhanging portion 12 is located on the drainage groove 26 even when the bridge girder 1 is moved to the position farthest from the abutment 2, and the parapet 21 facing the girder end overhanging portion 12 and Rainwater or the like flowing down during this period is dropped into the drainage groove 26. Further, a drainer 12b protruding downward is provided at the lower end of the tip of the beam end overhanging portion 12, and rain water or the like flowing down the tip end surface of the beam end overhanging portion 12 wraps around the underside of the beam end overhanging portion 12. Is preventing.

  As shown in FIG. 2, the bridge girder 1 has a box-shaped cross-section, and is provided with an end cross girder 13 at the end of the girder and has high rigidity, and supports the above-described girder end protruding portion 12. It has become. Further, the floor slab overhanging portion 14 that protrudes from the box-shaped section to both sides is thickened at the end of the beam as shown in FIG. A girder end projecting portion 12 is formed continuously. Thereby, even in the part where the floor slab of the bridge girder is overhanging, the beam end overhanging portion 12 has sufficient strength to support the load on the road surface.

  The telescopic device 4 is composed of a pair of structures supported by the parapet 21 and the girder end overhanging portion 12, the structure on the bridge girder side being the girder end overhanging portion 12, and the structure on the abutment side being the concrete of the parapet 21. Fixed. Each structure includes a support base 41 and a plurality of fingers 42 provided so as to protrude from the support base 41 in the axial direction of the bridge girder, and constitutes a so-called finger type expansion and contraction device. The fingers 42 are arranged at predetermined intervals in a direction crossing the bridge beam 1, and each finger 42 of one finger row is inserted between the fingers of the finger rows protruding so as to face each other. As a result, even if a relative displacement occurs between the bridge beam and the parapet, the amounts inserted between the fingers are changed to allow relative displacement. The upper surface of these fingers 42 is almost the same height as the upper surface of the pavement 7 laid on the bridge girder 1 and the embankment, and the vehicle can travel across both finger rows, Road continuity is maintained.

  In the telescopic device 4 supported in this way, rain water or the like that flows on the road surface flows down from between the fingers 42 but flows into the drainage groove 26 provided in the upper part of the parapet and is drained to the side of the abutment 2. The Therefore, it is possible to prevent rainwater or the like from flowing down the end surface 11 of the bridge girder 1 and the opposing surface of the parapet 21 that opposes the end surface 11, and it is avoided that these surfaces become dirty or deteriorated.

  In the above-described embodiment, the expansion / contraction device 4 is a finger-type expansion / contraction device, but is not limited to this, and has a structure in which a rubber connecting member is attached between a bridge girder and a parapet, It is possible to employ a composite member made of a rubber material and a steel member so as to be bridged between the bridge girder and the parapet. And it can be set as the structure which guides the rainwater etc. which flowed down between the bridge girder 1 and the parapet 21 at the time of the failure | damage of a rubber material, etc. to the drain groove 26, and drains.

  The bridge girder 1 is made of concrete in the above embodiment, but is not limited to this. The upper girder and the lower floor slab are made of concrete, and the web part is a girder made of steel. It may be the structure which provided the concrete floor slab on the steel girder. However, it is desirable to form the overhanging portion of the girder supporting the telescopic device with concrete, and it is preferable that the end of the bridge girder is reinforced with a horizontal girder or the like to have sufficient rigidity.

FIG. 4 is a schematic cross-sectional view showing a “supporting structure for an expansion / contraction device” which is another embodiment of the present invention.
In this support structure as well as the support structure shown in FIG. 1, the telescopic device 53 is supported on the beam end projecting portion 51 provided so as to project from the end surface of the bridge beam and on the parapet 52 of the abutment. And the drainage groove 54 is provided in the upper part of the parapet 52 so that the lower side of the part which protruded so that the finger of the expansion-contraction apparatus 53 may oppose may be received.
In this embodiment, the depth of the drainage groove 54 is large, and an operator can enter the drainage structure 54 and perform operations such as cleaning. In order for the operator to enter, for example, the width of the drainage groove 54 may be about 50 to 60 cm and the depth may be about 80 cm.

  By adopting such a structure, it becomes easy to always maintain the drain groove 54 in a state where rainwater or the like can be smoothly discharged. In addition, the telescopic device 53 can be inspected from below.

FIG. 5 is a schematic cross-sectional view showing a “supporting structure for an expansion / contraction device” which is another embodiment of the present invention.
In this support structure as well as the support structure shown in FIG. 1, the telescopic device 63 is supported on the beam end overhanging portion 61 and the parapet 62, and the parapet 62 receives the lower side where the telescopic device 63 is provided. Thus, a drain groove 69 is provided.
In this embodiment, the girder end projecting portion 61 is formed by fixing a concrete block 64 formed in advance to the bridge girder 70 by the tension force of the tension members 65 and 66. The support base 63a and the fingers 63b on the bridge girder side of the telescopic device 63 are fixed so as to be integrated when the concrete block 64 is formed.
Further, the abutment side support base 63c and the fingers 63d fixed to the parapet are also integrated with the concrete block 67 formed in advance, and are fixed to the parapet 62 by the tension of the tension material 68. .

The tension members 65 and 66 for fixing the concrete block 64 to the bridge girder 70 are disposed in a sheath (not shown) embedded in advance in a predetermined position between the concrete block 64 and the end cross beam 70 a of the bridge girder 70. That is, when the concrete block 64 is supported at a predetermined position, the sheath embedded in the concrete block 64 and the sheath embedded in the bridge girder 70 are continuously arranged, and the tension members 65, 66 can be inserted to introduce tension. Further, the end portion of the tension member 66 is embedded in the concrete block 64 together with the fixing tool, and the concrete block 64 is placed at a predetermined position by inserting into the sheath embedded in the bridge girder 70 from the other end. May be introduced.
On the other hand, the concrete block 67 fixed to the parapet 62 can be similarly fixed by inserting a tension material 68 into a sheath embedded in advance and introducing a tension force to the tension material 68.

  The joints between the concrete blocks 64 and 67 and the concrete of the bridge girder 70 or the parapet 62 are brought into close contact with each other by inserting mortar, resin mortar, or synthetic resin. It is good to introduce tension.

In such a structure, the expansion / contraction device 63 can be easily removed together with the concrete blocks 64 and 67 by releasing the tension of the tension material. A concrete block is formed in advance so as to be integrated with a new expansion device, and the expansion device can be exchanged in a short time by joining it to the end of the bridge beam 70 and the top of the parapet 62 with a tension material. It becomes.
In general, replacement of a telescopic device supported by a conventional structure involves crushing a portion of concrete fixing the telescopic device, removing an old telescopic device, and then installing a new telescopic device. Then, the concrete is placed on the portion where the expansion device is fixed and hardened. During these operations, it is necessary to block the traffic, which hinders the traffic for a long time. On the other hand, in the structure as described above, the expansion / contraction device can be easily replaced, and the curing time of the resin mortar or the like inserted between the concrete block and the bridge girder or the parapet can be adjusted. It becomes possible to shorten the time to block traffic.

1: bridge girder, 2: abutment, 3: rubber bearing, 4: telescopic device, 5: embankment, 6: tread plate, 7: pavement,
11: End face of bridge girder, 12: Girder edge overhanging part, 12a: End face of girder edge overhanging part, 12b: Draining, 13: End cross girder, 14: Floor slab overhanging part, 15: Thickening part of overhanging slab,
21: Parapet, 22: Bridge girder support part, 23: Telescopic device receiving part, 24: Bottom face of drainage groove, 25: Concrete wall body, 26: Drainage groove,
41: support base, 42: finger,
51: Girder end overhanging part, 52: Parapet, 53: Expansion / contraction device, 54: Drainage groove,
61: Girder end projecting part, 62: Parapet, 63: Telescopic device, 63a, 63c: Support base, 63b, 63d: Finger, 64: Concrete block, 65, 66: Tensile material, 67: Concrete block, 68: Tensile material 69: Drainage gutter, 70: Bridge girder

Claims (4)

A support structure for a telescopic device provided between an abutment and a bridge girder supported on the abutment so as to be movable in the axial direction.
The abutment is raised so as to face the end face of the bridge girder, and has a parapet that resists earth pressure of the back soil,
The bridge girder has a concrete girder edge overhanging portion that protrudes from the upper end surface toward the parapet ,
The surface of the parapet facing the bridge girder is raised almost vertically from the lower end, and the portion facing the beam end overhanging portion of the bridge girder is in a position retreated from the lower end to the back soil side,
The upper part of the back soil side from the surface facing the beam end overhanging portion of the parapet is an expansion device receiving portion for supporting the expansion device,
On the bridge girder side from the surface facing the beam end overhanging portion of the parapet, a drainage groove for draining to the side of the bridge girder is provided on the back soil side from the surface facing the lower part of the end surface of the parapet bridge beam ,
The telescopic device is supported by the beam end projecting part and the telescopic device receiving part of the parapet, and is installed so that rain water flowing downward from the telescopic part of the telescopic device flows into the drainage groove. A support structure for a telescopic device, characterized by   2. The support structure for a telescopic device according to claim 1, wherein the drain groove is formed in a size that allows an operator to pass in the drain direction.   The girder edge overhanging portion is a concrete block formed in advance so as to be integrated with the bridge girder side of the expansion / contraction device, and the tension force of the tension material having one end fixed to the concrete block and the other end fixed to the bridge girder. The support structure for the telescopic device according to claim 1, wherein the support structure is fixed to the bridge girder.   The abutment side of the expansion device has a concrete block formed in advance so as to be integrated with the abutment side of the expansion device. The tension of the tension member is fixed to the concrete block at one end and fixed at the other end to the abutment. The support structure for an extension device according to claim 1 or 2, wherein the support structure is fixed to the abutment by force.

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