JP3640251B2 - Bridge reinforcement structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bridge reinforcement structure for the purpose of improving the load bearing capacity of a river bridge or a land bridge built between bridge piers.
[0002]
[Prior art]
Conventionally, as a reinforcing measure for enhancing the load bearing capacity of an existing bridge, as shown in FIG. 1, the steel plate 2 is firmly bonded to the entire lower surface of the floor slab 1 or the circumferential surface of the bridge girder using an epoxy resin adhesive. A construction method or a construction method in which tensile strength fibers 3 such as carbon fibers and aramid fibers are bonded using the above-mentioned adhesive material is performed.
[0003]
[Problems to be solved by the invention]
The above-mentioned method of attaching steel plates and tensile strength fibers is intended to exert a reinforcing effect due to the tensile strength when a live load (load by a traveling vehicle) is applied to the floor slab or bridge girder. There is a problem that strength reduction and peeling due to the remarkably difficult to achieve a sound reinforcing effect over a long period of time.
[0004]
In addition, the effect of reducing the stress due to the dead load cannot be expected with respect to the dead load when the live load is not applied (the weight of the bridge itself). Also, the construction cost is very expensive.
[0005]
Although the above-mentioned reinforcement method is superior as a method that conforms to the restrictions on the height of the bridge from the water surface and road surface, drastic measures to replace it are in demand due to the above problems.
[0006]
[Means for Solving the Problems]
The present invention functions effectively not only for the live load but also for the dead load, and at a construction cost that is simple and inexpensive to construct, and is not accompanied by aged deterioration such as the above-described tensile material bonding method. It is intended to provide a bridge reinforcement structure that can maintain soundness.
[0007]
Furthermore, the present invention provides a bridge reinforcement structure that can be carried out while minimizing the occupied height with respect to the height restriction from the water surface and road surface of the bridge.
[0008]
This bridge reinforcement structure is constructed by installing a beam between the left and right piers that extends in the bridge length direction in the left and right outer areas of the bridge between the piers, and extends in the bridge width direction along the lower surface of the bridge and receives the bridge. Pillow material is laid sideways, both ends of the pillow material project to the left and right outer areas of the bridge, the pillow material is pushed up between the left and right projecting ends of the pillow material and the bridge beam between the left and right piers, and the bridge is interposed via the pillow material It is configured to provide a push-up means for pushing up .
[0009]
As the push-up means, a screw-type jack that holds the push-up position by screwing is used.
[0010]
In the above-mentioned bridge reinforcement structure, a constant pushing force is always applied to the floor slab or bridge girder (main girder) that forms the bridge to reduce the stress caused by the active load applied to the floor slab and bridge girder of a traveling vehicle and the like. The stress generated by the dead load to which no load is applied, that is, the dead load due to the weight of the bridge itself is reduced.
[0011]
The live load or dead load is received by a bridge pier beam via a push-up means represented by the jack, and is received by a bridge pier that can lay the beam.
[0012]
The above-mentioned screw type jack is excellent in load bearing capacity against a heavy load, can always maintain a constant pushing force, and is suitable as a reinforcing structure for a bridge.
[0013]
Furthermore, in order to limit the height of the bridge from the water surface and the road surface, it is only necessary to place the pillow material horizontally so that both ends of the pillow protrude from the left and right outer areas of the bridge. Is possible.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The following embodiments of the present invention will be described with reference to FIGS. 2 to 8.
[0015]
As shown in FIGS. 2 to 7 , a beam 8 between the left piers that extends in the bridge length direction is installed between the piers 4 in the left outer region of the bridge 6, and in the right outer region of the bridge 6 between the piers 4. A beam 8 between the right piers that extends in the bridge length direction is installed, and a pillow material 7 that extends in the width direction of the bridge along the lower surface of the other bridge 6 and receives the bridge 6 is installed horizontally. Pushing means for projecting both ends to the left and right outer areas of the bridge 6, pushing up the pillow 7 between the left and right projecting ends 33 of the pillow 7 and the beam 8 between the left and right piers and pushing up the bridge 6 through the pillow 7 10 is provided to constitute a reinforcing structure of the bridge 6.
[0016]
The beam 8 between the left and right piers supports both ends thereof directly or indirectly on the upper surface of the pier 4. The left beam 8 is one or more, and the right beam 8 is also one or more. Here, the pier 4 is used to include an abutment in contact with the land in a river bridge.
[0017]
It said push-up means 10 is screw jack 20 for holding a position raised push the engagement which is load receiving on the pier between erection beam 8 is proper.
[0018]
The pillow 7 supports the lower surface of the floor slab 17 or lays horizontally so as to support the lower surface of the bridge girder (main girder) 11 that supports the floor slab 17.
[0019]
As shown in FIG. 6 , the pillow material 7 is provided in the middle of the extension length of the bridge 6, that is, in the floor slab 17 portion or the bridge girder 11 portion that extends between the bridge piers 4, and a plurality of the pillow materials 7 are provided horizontally. .
[0020]
The bridge 6 is pushed up in the outer region of the bridge by the pushing-up means 10 provided between the beam 8 between the bridge piers and the pillow material 7. Accordingly, the left and right ends of the pillow material 7 project to the outside area of the bridge 6. As shown in FIGS. 2 and 4 , W indicates the bridge width of the bridge 6, and the bridge outer area means an outer area of the bridge width W.
[0021]
Based on FIGS. 2-7 illustrating a specific example of the reinforcing structure to impart upward force to the bridge 6.
[0022]
As shown in FIG. 5 , legs having a seating surface that extends on both outer sides in the bridge width direction of the bridge pier 4 to the left and right outer regions in the bridge width direction of the bridge 6 and is flush with the seating surface that supports the floor slab 17. The seats 12 ′ are extended (added), and both ends of the beam 8 between the piers are supported on the seat surface (upper surface) of the pedestal 12 ′ of each pier 4 to be installed between the piers 4. An impact absorbing seat 13 made of a rubber bearing or the like is interposed between the bridge beam 8 and the seat surface of the leg seat 12 '.
[0023]
For example, when the pier 4 is made of concrete, the pedestal 12 ′ is made of a single piece of concrete, and when the pier 4 is made of steel, the pedestal 12 ′ made of steel is welded or hammered. To make an integral structure. Alternatively, the steel pedestal 12 'is attached to the concrete pier 4 with an anchor bolt or the like to form an integral structure.
[0024]
The pillow 7 is made of H-shaped steel, and the upper flange 15 supports the lower surface of the floor slab 17, and the upper flange 15 is simply overlapped and supported on the lower surface of the floor slab 17, or the upper flange 15 is supported on the lower surface of the floor slab 17. It is used as means for receiving pressure by pushing up or lowering the flanges 16 at both ends thereof.
[0025]
As shown in FIG. 5 , the beam 8 between the bridge piers is provided in parallel in each of the left and right outer regions of the bridge 6 in the bridge width direction. That is, the beam 8 between the piers is juxtaposed in the left outer region in the bridge width direction of the bridge 6 so as to be juxtaposed in the bridge width direction, and the beam 8 between the piers is similarly arranged in the right outer region in the bridge width direction of the bridge 6. Are arranged side by side in parallel in the width direction of the bridge.
[0026]
The beam 8 between the bridge piers is installed on the leg seat 12 'so as to be lower than the pillow 7 and the overhanging portions (pressure receiving portions) at both ends thereof. A representative push-up means 10 is installed.
[0027]
That is, a support seat 18 is mounted between the pair of bridge pier construction beams 8 on the left and right sides in the bridge width direction, and a jack 20 as the push-up means 10 on the support seat 18, for example, a screw combined with hydraulic or pneumatic pressure. Mount the jack.
[0028]
The pillow member 7 protrudes linearly both ends thereof to the left and right outer areas of the bridges 6 or (broken line Shimesuru in FIG. 4), or in solid Shimesuru so Figure 4, the ends of the pillow member 7 bridges 6 Using a space with no restriction on the left and right outer regions, the bridge 6 is raised along the left and right outer surfaces, and a protruding end 33 is continuously connected from the upper end of the rising portion 31 to the outside, that is, the bridge 6 as a whole. Inverted L-shaped pressure receiving ends are formed in the left and right outer regions. The projecting end 33 of the pressure receiving end is pushed up by the jack 20 as the pushing-up means 10.
[0029]
Therefore, the jack 20 which is the push-up means 10 is disposed on the side of the floor slab 17 or the bridge girder 11 forming the bridge 6. Thus, by projecting both ends of the pillow material 7 to the outside region of the bridge 6, it is possible to give an upper form without restriction of the projecting end, and by this form assignment, the space immediately below the bridge 6 can be occupied. The structure which gives pushing-up force without being able to implement | achieve can be implement | achieved.
[0030]
On the other hand, both ends of the pillow material 7 are disposed directly above the jack 20, in other words, the jack 20 is disposed directly below both ends of the pillow material 7, and the jack 20 is extended to extend the lower flange of the protruding end 33 at both ends of the pillow material 7. 16 is pushed up, and a pushing force is applied to the floor slab 17 constituting the bridge 6 through the pushing up of the pillow material 7. Alternatively, by extending the jack 20, the lower flanges 16 at both ends of the pillow material 7 are pushed up, and a pushing force is applied to the lower flange 29 of the bridge girder 11 constituting the bridge 6 through the pushing up of the pillow material 7.
[0031]
That is, in the above-described embodiment, the example in which the lower surface of the floor slab 17 is supported by the pillow material 7 is shown, but the lower surface of the bridge girder 11 can be supported by the pillow material 7 and a pushing force can be applied.
[0032]
As the push-up means 10, a jack 20 having a hydraulic cylinder structure or a pneumatic cylinder structure can be used. In particular, a screw type jack 20 using both hydraulic and pneumatic pressures that holds the push-up position by screwing shown in FIG. 7 is suitable. It is.
[0033]
As an example of the screw-type jack, a jack 20 that is screwed (expanded) or screwed (shrinked) by rotating a cylinder rod with a cylinder and a cylinder rod being screwed together can be used. Thus, a pushing force is applied to the floor slab 17 or the bridge girder 11, and a live load and a dead load are supported by screwing of the female screw and the male screw.
[0034]
As a preferred example, as described above, the screw type jack 20 used in combination with a hydraulic or pneumatic cylinder, that is, combined with a hydraulic cylinder shown in FIG. 7 , is used. The jack 20 has a lower end of a cylinder rod 21 with a male thread engraved on the peripheral surface thereof, which is airtightly fitted into the cylinder 22 and protrudes upward from the cylinder 22. A stopper flange 23 is screwed onto the outer peripheral surface of the protrusion. The cylinder 22 is provided with a fluid pressure supply port 25 for supplying hydraulic pressure or pneumatic pressure into the hydraulic pressure or pneumatic chamber 24 formed on the lower surface of the cylinder rod 21 at the bottom of the cylinder 22.
[0035]
The live load and dead load are received by the bridge pier construction beam 8 that is additionally installed via the screw type jack 20, and are received by the pier 4 that supports both ends of the beam. The screw-type jack 20 is a rigid push-up structure as described above, is excellent in load resistance against a large load, can always maintain a constant push-up force, and can easily set a push-up force according to the push-up position and is suitable. .
[0036]
Then, by supplying hydraulic pressure or pneumatic pressure through the fluid pressure supply port 25, the cylinder rod 21 is raised, and a constant push-up force is applied to the floor slab 17 or the bridge girder 11 by a certain amount of lift.
[0037]
Next, it is confirmed by the pressure gauge that the constant pushing force is applied, and the stopper flange 23 is screwed down (lowered) along the cylinder rod 21 in a state where the pushing force is applied, and is seated on the upper end surface of the cylinder 22. Dress it up. Therefore, the cylinder rod 21 is prevented from descending and a constant rigid push-up force is maintained.
[0038]
After the cylinder rod 21 is prevented from descending by the stopper flange 23 and maintained in the extended state, the fluid in the hydraulic or pneumatic chamber 24 is extracted and opened through the fluid pressure supply port 25. Thereafter, the push-up force is maintained by screwing the screw jack 20.
[0039]
Further, the stopper flange 23 is loosened at any time after the reinforcement work, and the above operation of supplying the fluid pressure again from the fluid pressure supply port 25 and fastening with the stopper flange 23 is performed, thereby increasing the pushing force of the cylinder rod 21. It can be adjusted and corrected.
[0040]
In the embodiment in which the pushing force is applied to the bridge 6, as shown in FIGS. 4 and 7, the threaded jack 20 combined with the fluid pressure is erected, and the cylinder 22 is supported by the bridge pier beam 8. At the same time, the lower flange 16 of the pillow 7 is supported by the cylinder rod 21 protruding upward.
[0041]
In this case, as shown in FIG. 7, the lower flange 16 of the pillow 7 is directly pushed up by the cylinder rod 21, or an inclusion is provided between the cylinder rod 21 and the lower franc 16 to indirectly apply the pushing force.
[0042]
Thus, as described above, the pillow member 7 is pushed up by the extension of the cylinder rod 21, and a pushing force is applied to the floor slab 17 or the bridge girder 11 constituting the bridge 6.
[0043]
When a plurality of pairs of the pushing-up means 10 and the pillow material 7 are provided at intervals in the bridge length direction, the bridge girder 11 or the floor slab 17 having a long span length is required to be pushed up at a plurality of points of the extension length. Power can be granted.
[0044]
As shown in FIG. 8, a truss structure can be added to the beam 8 between the piers. That is, truss girders 27 are provided at both ends of the beam between the bridge piers 8, that is, the beam between the bridge piers 8 is connected so as to be a chord material of the truss girder 27. Are connected by a number of diagonal members 28 to form a truss structure.
[0045]
Or the arch material connected to the both ends of the beam 8 between bridge piers is provided, ie, the beam 8 between bridges is connected so that it may become a chord material of an arch material. The truss girder 27 or the arch material extends in the bridge length direction along both sides of the floor slab 17, that is, the bridge 6 in the bridge length direction.
[0046]
The truss structure or the arch structure can improve the load bearing capacity of the beam 8 between the bridge piers, and thus can increase the pushing force of the bridge girder 11 or the floor slab 17.
[0047]
The solid line Shimesuru so 8, or the truss girder 27 or the arch member is constructed on the upper side of the pier between erection beams 8, or a broken line Shimesuru so in FIG. 8, it is built on the lower side of the beam 8 it can.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing an example in which a tensile strength material is bonded to the entire bottom surface of a floor slab as a conventional bridge reinforcing structure.
Figure 2 A shows an embodiment of a reinforcement structure of a bridge which imparts increased force pushing the bridges in the present invention, the bridge width direction cross-sectional view of the bridge at the site in which a pillow member, B is a bridge girder in the A Figure The principal part sectional drawing which shows the coupling | bond part of a pillow material.
FIG. 3 is a cross-sectional view in the bridge width direction of a bridge at a bridge pier portion where a beam between bridge piers can be horizontally mounted in the embodiment.
[4] the bridge widthwise sectional view of the bridge at the site provided with the pillow member and the push-up means.
FIG. 5 is a cross-sectional view in the bridge width direction of the bridge at a pier site where the beam between the piers in the embodiment can be horizontally mounted.
[6] A plan view of the bridge of the above-described embodiment, B is the side view.
FIG. 7 is a front view showing a structure for pushing up a pillow material by a jack in the embodiment.
FIG. 8 is a side view of a bridge when the beam between the piers has a truss structure in the embodiment.
[Explanation of symbols]
4 ... Bridge pier, 5 ... Connecting material, 6 ... Bridge, 7 ... Pillow material, 8 ... Bridge pier beam, 10 ... Push-up means, 11 ... Bridge girder, 12, 12 '... Leg seat, 13 ... Shock absorbing seat, 15 ... Upper flange of pillow material, 16 ... Lower flange of pillow material, 17 ... Floor slab, 18 ... Support seat, 20 ... Jack, 21 ... Cylinder rod, 22 ... Cylinder, 23 ... Stopper flange, 24 ... Hydraulic or pneumatic chamber, 25 ... Fluid pressure supply port, 27 ... Truss girder, 28 ... Diagonal material, 29 ... Lower flange of bridge girder, 30 ... Bolt and hook, 31 ... Rising part of pillow material, 33 ... Projection end of pillow material

Claims (2)

A beam between the left and right piers that extends in the bridge length direction in the left and right outer areas of the bridge is installed between the piers, and a pillow material that extends in the bridge width direction along the lower surface of the other bridge and receives the bridges is laid sideways. Both ends of the pillow material are projected to the left and right outer areas of the bridge, and a push-up means for pushing up the pillow material between the left and right projecting ends of the pillow material and the bridge beam between the left and right piers and pushing up the bridge via the pillow material is provided. Bridge reinforcement structure characterized by this. The bridge reinforcement structure according to claim 1, wherein the push-up means is a screw-type jack that holds the push-up position by screwing.

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