JP4220096B2 - Mounting structure of expansion device for bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is a mounting structure for a bridge extension device, particularly when a gap formed between bridge girders extends beyond the adjustment limit, or when a step exceeding the height adjustment limit occurs between the girders. Even so, the present invention relates to a mounting structure for a bridge extension device that can easily and reliably replace the extension device to the girder.
[0002]
[Prior art]
Conventionally, girder gaps of bridge structures such as road bridges and pedestrian bridges (hereinafter simply referred to as bridges) expand and contract due to temperature changes, shrinkage due to drying of concrete, loads, and the like. In order to allow the vehicle or the like to travel without hindrance to this expansion / contraction, an expansion / contraction device capable of expansion / contraction corresponding to the expansion / contraction of the girder gap is attached between the beams, and the bridge girder gap is blocked by this expansion / contraction device. Has been.
[0003]
As the expansion / contraction device, a load applied to a plurality of joint beams arranged in a girder width direction in a girder gap is received by a plurality of support beams arranged between the girders perpendicularly to the joint beam and slidably. A Maurer-type telescopic device is known.
[0004]
Hereinafter, this Maurer type expansion and contraction device will be described with reference to the drawings.
[0005]
FIG. 6 is a partial schematic perspective view showing the Maurer type expansion and contraction device, FIG. 7 is a schematic plan view showing the mounting state of the control rubber in the Maurer type expansion and contraction device, and FIG. 8 is a cross-sectional view showing the conventional mounting structure of the Maurer type expansion and contraction device. FIG.
[0006]
6 to 8, reference numeral 1 denotes a pair of boxes in which opposed surfaces fixed facing both girders 2 are opened. A plurality of pairs of boxes 1 are provided at intervals along the digit width direction. A plurality of support beams 3 are slidably passed between the pair of boxes 1 via an upper bearing 4 and a lower bearing 5. Reference numeral 6 denotes a middle beam for joints of the same number as that of the support beam 3 fixed on the support beam 3 at right angles to the support beam 3 in the width direction. Reference numeral 7 denotes a joint end beam fixed to the box 1 in parallel with the middle beam 6.
[0007]
Reference numeral 8 denotes a seal rubber for closing a gap between the end beam 7 and the adjacent middle beam 6 and between the middle beams 6. One middle beam 6 is fixed to only one support beam 3. This is the same in each pair of boxes 1. Reference numeral 9 denotes a control rubber that is interposed between the box 1 and the side surface of the middle beam 6 and between the side surfaces of the middle beam 6 to make the expansion of each seal rubber 8 uniform.
[0008]
According to the Maurer type expansion and contraction device configured as described above, when the beam gap expands and contracts due to a temperature change or the like, each support beam 3 follows the beam width direction through the upper and lower bearings 4 and 5 following this. The gap between the middle beams 6 is expanded while being sealed by the seal rubber 8. Therefore, even if the girder gap expands and contracts, it does not hinder the running of the vehicle and can prevent leakage of rainwater and the like.
[0009]
As another expansion / contraction device, a finger type expansion / contraction device including a pair of comb-shaped joint plates fixed to face each other so as to mesh with each other is known.
[0010]
Hereinafter, this finger type expansion and contraction device will be described with reference to the drawings.
[0011]
FIG. 9 is a schematic cross-sectional view showing a finger type expansion and contraction device.
[0012]
In FIG. 9, reference numeral 21 denotes a pair of comb-like joint plates fixed to face each other so as to mesh with each other 2, and approach and separate in a state of meshing with each other according to the expansion and contraction of the beam gap. Therefore, even if the girder gap expands and contracts, it does not hinder the running of the vehicle.
[0013]
[Problems to be solved by the invention]
However, as shown in FIG. 8, the above-described Maurer type expansion and contraction device has its end (box 1) firmly fixed on the girder 2 by reinforcing bars 22, concrete 23, and the like. When the gap between the beams is expanded beyond the expansion / contraction limit between the joint beams or a step exceeding the height adjustment limit is generated between the beams, the concrete 23 filled around the box 1 is completely destroyed. Therefore, it has been necessary to change the mounting position of the expansion / contraction device, and much effort and time have been required to replace the expansion / contraction device.
[0014]
Also in the above-described finger type expansion and contraction device, as shown in FIG. 9, since the end of the joint plate 21 is firmly fixed on the beam 2 by the reinforcing bars 22 and the concrete 23, etc., the ground movement due to the earthquake, etc. When the gap between the girders spreads beyond the expansion / contraction limit of the joint plate 21 or when a step exceeding the height adjustment limit occurs between the girders, the concrete filled around the end of the joint plate 21 23 had to be broken and the mounting position of the expansion / contraction device had to be changed, and much effort and time were required to replace the expansion / contraction device.
[0015]
This problem is caused by supporting the upper and lower bearings by placing the support beam diagonally between the boxes via the upper and lower bearings in other telescopic devices such as the finger type telescopic device described above, for example, the Maurer type telescopic device. The same applies to other modular expansion and contraction devices such as a Maurer swivel expansion and contraction device that is slidable on the axis of the beam.
[0016]
Accordingly, the object of the present invention is to provide a girder even when the gap formed between the beams of the bridge extends or contracts beyond the adjustment limit or when a step exceeding the height adjustment limit occurs between the beams. It is an object of the present invention to provide a mounting structure for a bridge extension / contraction device that can easily and reliably replace the extension / contraction device.
[0017]
[Means for Solving the Problems]
The invention according to claim 1 is an attachment structure of a bridge extension device for closing the girder gap, which can be extended and contracted in accordance with the extension and reduction of the bridge girder gap. A mounting space is formed, and the end of the telescopic device is detachably mounted on the base constructed at the bottom of the end mounting space, and the end is mounted movably in a direction orthogonal to the girder width direction. According to the expansion and contraction of the girder gap, the end portion can be moved within the end mounting space .
[0018]
The invention according to claim 2 is characterized in that the height of the expansion / contraction device is adjusted by interposing a spacer between the base and the expansion / contraction device.
[0019]
According to a third aspect of the present invention, in the telescopic device, a load applied to a plurality of joint beams arranged in the girder width direction in the girder gap is arranged between the girders so as to be slidable at right angles to the joint beam. Further, it is characterized in that it consists of what is received by a plurality of support beams.
[0020]
The invention according to claim 4 is characterized in that the expansion and contraction device comprises a pair of comb-shaped joint plates which are fixed to face both girders so as to approach and separate from each other in a state of being engaged with each other. It is.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a structure for attaching an expansion / contraction device when the present invention is applied to a Maurer type expansion / contraction device will be described with reference to the drawings.
[0022]
FIG. 1 is a schematic cross-sectional view showing the mounting structure of the Maurer type expansion and contraction device according to the present invention, FIG. 2 is a schematic cross-sectional view showing a replacement state of the Maurer type expansion and contraction device when the girder gap is widened, and FIG. It is a schematic sectional drawing which shows the replacement state of the Maur type expansion-contraction apparatus when a level | step difference arises between them.
[0023]
1 to 3, the same reference numerals as those in FIGS. 6 and 7 denote the same items. In other words, 1 is a pair of boxes with opposed surfaces fixed opposite to both girders 2 and 3 is slidably inserted between each pair of boxes 1 via an upper bearing 4 and a lower bearing 5. The plurality of support beams passed through 6 are a joint middle beam fixed on the support beam 3 at right angles to the support beam 3 in the width direction, and 7 is parallel to the middle beam 6 in the box 1. The fixed joint end beam 8 is a seal rubber for closing the gap between the end beam 7 and the adjacent middle beam 6 and between the middle beams 6. Although not shown, a control rubber is provided between the box 1 and the side surface of the middle beam 6 and between the side surfaces of the middle beam 6 to make the expansion of each seal rubber 8 uniform.
[0024]
Reference numeral 10 denotes an end attachment space of the Maurer type expansion and contraction device formed on the beam 2 in the width direction of the beam. The end mounting space 10 is formed by a base 11 constructed on the girder 2 in the girder width direction and a side wall 12 constructed in the girder width direction, and between the base 11 and the side wall 12. The gap is closed by the closing plate 13. The base 11 is firmly fixed to the beam 2 with anchor bolts 15 or the like.
[0025]
An opening 11A is formed in the inner side plate of the base 11 so that the expansion and contraction device fixing bolt 14 described later can be tightened and loosened from the outside of the base 11 through the opening 11A.
[0026]
The end of the Maurer type telescopic device is detachably attached to the base 11 with bolts 14. The box 1 in the end portion mounting space 10 and the upper end of the side wall 12 are connected by a connecting plate 16. The space above the box 1 and outside the side wall 12 is filled with concrete 17. The side wall 12 is firmly fixed to the concrete 17 by anchor bolts 15 or the like.
[0027]
According to the mounting structure of the Maurer type expansion / contraction device of the present invention configured as described above, replacement of the expansion / contraction device is performed as follows.
[0028]
When the girder gap extends beyond the adjustment limit, as shown in FIG. 2, the concrete plate 17 </ b> A at the top of the box 1 is pinched and then the connecting plate 16 is melted. Next, the bolt 14 is removed, the attachment position of the box 1 is moved to the girder gap side, and is fixed by the bolt 14 again. In this way, when the expansion and contraction device is fixed between the expanded girders, the space generated by the movement of the box 1 is partitioned by the partition plate 18, the concrete space 19 is filled into the partitioned space, and the box 1 Again, the concrete 17A is filled in the upper part.
[0029]
In this way, the replacement of the Maurer type expansion and contraction device when the girder gap is widened can be easily and reliably performed without breaking the concrete 23 filled around the box 1 as in the prior art.
[0030]
When a step exceeding the height adjustment limit occurs between the girders, as shown in FIG. 3, the concrete plate 17 </ b> A at the top of the box 1 is pinched, and then the connecting plate 16 is melted. Next, the bolt 14 is removed, a spacer 20 having a predetermined thickness is sandwiched between the base 11 and the box 1, and the bolt 14 is fixed again. In this way, when the replacement of the expansion / contraction device between the girders with no step is completed, the upper portion of the box 1 is filled with the concrete 17A again.
[0031]
In this manner, the replacement of the Maurer type expansion and contraction device when a step is generated between the girders can be easily and reliably performed without breaking the concrete 23 filled around the box 1 as in the prior art.
[0032]
The above description is for the case where the girder gap is widened. However, when the girder gap is narrowed beyond the limit, the state shown in FIG. In this case, padding such as polystyrene foam is put in the space between the partition plate 18 and the side wall 12. When the girder gap shrinks beyond the limit, the partition plate 18 and the padding are removed, and the attachment position of the expansion / contraction device is changed as shown in FIG.
[0033]
Next, an embodiment of the mounting structure of the expansion / contraction device when the present invention is applied to a finger type expansion / contraction device will be described with reference to the drawings.
[0034]
FIG. 4 is a schematic cross-sectional view showing the attachment structure of the finger type expansion / contraction device of the present invention, and FIG. 5 is a schematic cross-sectional view showing a replacement state of the finger type expansion / contraction device when the girder gap is widened.
[0035]
4 and 5, the same reference numerals as those in FIG. 9 denote the same items. That is, 21 is a pair of comb-shaped joint plates fixed opposite to each other so as to mesh with both girders 2.
[0036]
Reference numeral 24 denotes an end attachment space of the finger type expansion and contraction device formed on the beam 2 in the width direction of the beam. The end portion mounting space 24 is formed by a base 25 constructed on the girder 2 in the girder width direction and a side wall 26 constructed in the girder width direction. The base 25 is firmly fixed to the beam 2 with anchor bolts 27 and the like.
[0037]
An opening 25 </ b> A is formed in the side plate inside the base 25, and the tightening and loosening operations of the telescopic device fixing bolt 28, which will be described later, can be performed from the outside of the base 25 through the opening 25 </ b> A.
[0038]
An end portion of the finger type expansion and contraction device is detachably attached to the base 25 by a bolt 28. The space outside the side wall 26 is filled with concrete 29. The side wall 26 is firmly fixed to the concrete 29 by an anchor bolt 27 or the like.
[0039]
According to the mounting structure of the finger type expansion and contraction device of the present invention configured as described above, the replacement of the expansion and contraction device is performed as follows.
[0040]
When the girder gap extends beyond the adjustment limit, as shown in FIG. 5, the bolt 28 is removed, the attachment position of the joint plate 21 is moved to the girder gap side, and the bolt 28 is fixed again. When the expansion / contraction device is fixed between the expanded girders in this way, the space generated by the movement of the joint plate 21 is partitioned by the partition plate 30 and the concrete 31 is filled into the partitioned space.
[0041]
In this way, the finger-type expansion and contraction device can be easily and reliably replaced without breaking the concrete 23 filled around the joint plate 21 as in the prior art when the girder gap is widened.
[0042]
If a step exceeding the height adjustment limit occurs between the girders, the bolt 28 is removed, a spacer (not shown) having a predetermined thickness is sandwiched on the base 25, and the bolt 28 is fixed again. .
[0043]
In this manner, the finger-type expansion and contraction device can be easily and reliably replaced without breaking the concrete 23 filled around the joint plate 21 as in the prior art when a step is generated between the girders.
[0044]
The above description is for the case where the girder gap is widened. However, when the girder gap is narrowed beyond the limit, the state shown in FIG. In this case, padding such as polystyrene foam is placed in the space between the partition plate 30 and the side wall 26. When the girder gap shrinks beyond the limit, the partition plate 30 and the padding are removed, and the attachment position of the expansion / contraction device is changed as shown in FIG.
[0045]
The above is an example in which the present invention is applied to a Maurer-type telescopic device and a finger-type telescopic device, but it is of course possible to apply to other modular-type telescopic devices such as a Maurer swivel-type telescopic device. In this case, the same effect can be obtained.
[0046]
【The invention's effect】
As described above, according to the present invention, an end mounting space for the telescopic device is formed on the girder, and the end of the telescopic device is detachable on the base constructed at the bottom of the end mounting space. If the width of the girder is widened beyond the limit by being attached to it, or if it is shrunk, or if a step exceeding the height adjustment limit occurs between the girders, the replacement work of the expansion / contraction device will be expanded and contracted as before. There is a useful effect that the operation can be performed simply by operating the bolt and slightly reworking, without carrying out a large-scale construction such as breaking all the concrete around the end of the apparatus.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a mounting structure of a Maurer type expansion / contraction device according to the present invention.
FIG. 2 is a schematic cross-sectional view showing a replacement state of the Maurer type expansion and contraction device when the girder gap is widened.
FIG. 3 is a schematic cross-sectional view showing a replacement state of the Maurer type expansion and contraction device when a step is generated between girders.
FIG. 4 is a schematic cross-sectional view showing the attachment structure of the finger type telescopic device according to the present invention.
FIG. 5 is a schematic cross-sectional view showing a replacement state of the finger type expansion and contraction device when the girder gap is widened.
FIG. 6 is a partial schematic perspective view showing a Maurer type telescopic device.
FIG. 7 is a schematic plan view showing a mounting state of a control rubber in the Maurer type expansion and contraction device.
FIG. 8 is a cross-sectional view showing a conventional mounting structure of a Maurer type expansion and contraction device.
FIG. 9 is a schematic sectional view showing a finger type telescopic device.
[Explanation of symbols]
1: Box 2: Girder 3: Support beam 4: Upper bearing 5: Lower bearing 6: Middle beam 7: End beam 8: Seal rubber 9: Control rubber 10: End mounting space 11: Base 11A: Opening 12: Side wall 13 : Closing plate 14: Bolt 15: Anchor bolt 16: Connecting plate 17: Concrete 17A: Concrete 18 at the top of the box 18: Partition plate 19: Concrete 20: Spacer 21: Joint plate 22: Reinforcement 23: Concrete 24: End mounting space 25 : Base 25A opening 26: Side wall 27: Anchor bolt 28: Bolt 29: Concrete 30: Partition plate 31: Concrete

Claims (4)

In the mounting structure of a bridge extension device for closing the girder gap, which can be extended and contracted according to the extension and reduction of the bridge girder gap, an end attachment space for the extension device is formed on the girder, and the end Mounts the end of the telescopic device on the base constructed at the bottom of the section mounting space in a detachable manner, and attaches the end movably in the direction perpendicular to the width direction of the girder to support expansion and contraction of the girder gap And the attachment structure of the expansion-contraction apparatus for bridges characterized by enabling the said edge part to move within the said edge part attachment space .   2. The mounting structure for a bridge extension / contraction device according to claim 1, wherein a height of the extension / contraction device is adjusted by interposing a spacer between the base and the extension / contraction device.   The telescopic device receives a load applied to a plurality of joint beams arranged in the girder width direction in the girder gap by a plurality of support beams arranged slidably and perpendicularly to the joint beam between the girders. The mounting structure for a bridge extension / contraction device according to claim 1 or 2, wherein the bridge extension / contraction device is made of a material.   The said expansion-contraction apparatus consists of what makes a pair of comb-tooth shaped joint board fixed facing both said girders approach and separate in the state which mutually meshed | engaged, The characterized by the above-mentioned. Mounting structure for expansion devices for bridges.

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