JP3640249B2 - 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 an overland bridge that is installed 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 method of attaching the steel plate and the tensile fiber is to exert the reinforcing effect by the tensile force when the live load (load by the traveling vehicle) is applied to the floor slab 1 or the bridge girder. There is a problem that strength reduction and peeling due to deterioration are 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]
[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.
[0006]
The bridge reinforcing structure is constructed by horizontally placing a beam between bridge piers between bridge piers , and providing a load receiving material integrally with a bridge girder that can be bridged between the bridge piers or a floor slab supported by the bridge girder. And a lifting means for pushing up the load receiving material and pushing up the bridge via the load receiving material.
[0007]
As the push-up means, a screw-type jack that holds the push-up position by screwing is used.
[0008]
In the above-mentioned bridge reinforcement structure, a constant pushing force is always applied to the floor slab or bridge girder to reduce the stress caused by the live load applied to the floor slab and bridge girder of the traveling vehicle, etc. Reduce the stress caused by dead loads due to the weight of the bridge itself.
[0009]
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.
[0010]
The screw jack is excellent in load bearing capacity against a large load, and can maintain a constant pushing force at all times.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The following embodiments of the present invention will be described with reference to FIGS. 2-7.
[0012]
As shown in FIGS. 2 to 5, a beam 8 between the piers is horizontally extended between the piers 4 to extend in the bridge length direction, and a load receiving material 7 is provided integrally with the bridge 6 that can be laid between the other piers 4. Further, a push-up means 10 is provided between the bridge pier construction beam 8 and the load receiving material 7 to push up the load receiving material 7 and push up the bridge 6 through the load receiving material 7.
[0013]
For example, as shown in FIG. 2 , the beam 8 between the piers is extended in the bridge length direction in the outer region of the bridge 6 composed of the floor slab 17 and the bridge girder 11 supporting the floor slab 17.
[0014]
On the other hand, as shown in FIG . 2 and FIG. 3 , a load receiving material 7 that projects from the bridge 6 to the outside region is provided. The load receiving material 7 is provided in the middle of the extension length of the bridge 6, that is, in a portion extending between the bridge piers 4, either singly or at intervals.
[0015]
The bridge 6 is pushed up in the outer area of the bridge by the push-up means 10 provided between the beam 8 between the bridge piers and the load receiving material 7.
[0016]
As shown in FIG. 2, a plurality of bridge beams 11 arranged in parallel in the bridge width direction are connected by a connecting material 5. This connecting material 5 is either assembled as a reinforcing material at the time of bridge construction, or assembled at the time of reinforcing work after the bridge construction.
[0017]
The bridge girder 11, the load receiving material 7 and the connecting material 5 are all made of steel. For example, the bridge girder 11 and the connecting material 5 are formed of H-shaped steel as is known. On the other hand, the load receiving member 7 includes, as an example, a belly plate 14 that gradually becomes narrower from a wide base end, and an upper flange plate 15 and a lower flange plate 16 that project integrally from the upper and lower edges of the belly plate 14 to the left and right. The load receiving material is made of H-section steel.
[0018]
Based on FIGS. 2-5 illustrating a specific example of the reinforcing structure to impart upward force to the bridge 6.
[0019]
As shown in FIG. 4 , leg seats 12 ′ having a seating surface that is flush with the seating surface that supports the floor slab 17 are provided on both left and right outer sides of the bridge 6 in the bridge width direction at both ends of the bridge pier 4 in the bridge width direction. (Additional) The 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, and are horizontally mounted 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 '.
[0020]
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.
[0021]
On the other hand, as shown in FIG. 3 , the load receiving material 7 is projected from the outer surface of the floor slab 17 forming the bridge 6 to the left and right outer regions in the bridge width direction of the bridge 6. The load receiving material 7 projects in the middle of the extension length of the bridge 6, that is, at an extension portion between the bridge piers 4, with one or a plurality of intervals.
[0022]
As shown in FIG. 4 , 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.
[0023]
The bridge pier erection beam 8 is placed on the leg seat 12 ′ so as to be lower than the load receiving material 7, and the push-up means 10 represented by the jack 20 is installed on the pier erection beam 8. .
[0024]
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.
[0025]
On the other hand, the load receiving material 7 is disposed immediately above the jack 20, in other words, the jack 20 is disposed immediately below the load receiving material 7, and the jack 20 is extended to push up the lower flange 16 of the load receiving material 7, thereby A pushing force is applied to the floor slab 11 constituting the bridge 6 through the pushing up.
[0026]
In the embodiment described above, the load receiving material 7 is attached to the floor slab 17 via bolts or rivets. However, the load receiving material 7 is attached to the side surface of the bridge girder 11 and is arranged below the load receiving material 7. The jack 20 supported on the intermediate beam 8 can be configured to give the pushing force to the bridge girder 11.
[0027]
In the said embodiment, although the said load receiving material 7 was projected from the outer surface of the bridge girder 11 of the bridge width direction both ends to the outer side area of the bridge 6, and pushing up force was given to this, as an example, between the said bridge girder 11 is shown. The push-up force can be applied by push-up means 10 typified by a jack 20 in which the connecting member 5 for connecting the two is supported by the beam 8 between the piers. In this case, the connecting material 5 constitutes the load receiving material 7.
[0028]
Hydraulic cylinder structure as push means 10 shown in FIG. 3 to FIG. 5, or can be used jack 20 of pneumatic cylinder structures, in particular FIGS. 7 A, extended or retracted position by screwing as shown in B, that pushes up A screw-type jack 20 that uses a hydraulic pressure or pneumatic pressure to hold the position is suitable.
[0029]
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.
[0030]
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. As shown in FIG. 7 , the jack 20 has a lower end of a cylinder rod 21 in which a male thread is engraved on the peripheral surface thereof, which is airtightly fitted into the cylinder 22 and protrudes upward from the cylinder 22. The cylinder 22 is provided with a fluid pressure supply port 25 for screwing the stopper flange 23 and 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. It has a structure.
[0031]
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. .
[0032]
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.
[0033]
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.
[0034]
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.
[0035]
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.
[0036]
The jack 20 having the above-described fluid pressure cylinder structure forms a soft push-up structure having buffering properties, whereas the screw jack is a rigid push-up structure having no buffering properties.
[0037]
In the embodiment in which a pushing force is applied to the bridge 6 shown in FIGS. 2 to 5 , as shown in FIG. 7B , the screw type jack 20 combined with fluid pressure is erected, and the cylinder 22 is connected to the bridge-to-pier beam 8. And the lower flange 16 of the load receiving material 7 is supported by a cylinder rod 21 protruding upward.
[0038]
Thus, as described above, the load receiving material 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.
[0039]
When a plurality of pairs of the pushing-up means 10 and the load receiving 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 uniformly pushed up at a plurality of points of the extension length. Power can be granted.
[0040]
As shown in FIG. 6 , a truss structure can be given 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.
[0041]
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 in the bridge length direction.
[0042]
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.
[0043]
The solid line Shimesuru so in FIG. 6, 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. 6, to be constructed on the lower side of the same beam 8 it can.
[0044]
The present invention can be implemented not only as a reinforcing structure for an existing bridge 6 but also as a reinforcing structure for a newly installed bridge 6.
[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.
FIG. 2 is a cross-sectional view in the bridge width direction of a bridge at a portion where a load receiving material is provided on the bridge to which a pushing force is applied in the present invention.
FIG. 3 is a cross-sectional view in the width direction of the bridge at a portion where a load receiving material and a push-up means are provided, showing an embodiment of a bridge reinforcing structure for applying a push-up force to the bridge in the present invention.
FIG. 4 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.
FIG. 5 is a side view of a bridge in the embodiment.
FIG. 6 is a side view of a bridge when the beam between the piers has a truss structure in the embodiment.
FIG. 7A is a cross-sectional view of a hydraulic and screw jack used as a jack when contracted, and B is a cross-sectional view when extended, showing an embodiment in which a pushing force is applied to a bridge.
[Explanation of symbols]
4 ... Bridge pier, 5 ... Connecting material, 6 ... Bridge, 7 ... Load receiving material, 8 ... Bridge pier beam, 10 ... Push-up means, 11 ... Bridge girder, 12, 12 '... Leg seat, 13 ... Shock absorbing seat, 14 ... Abdominal plate, 15 ... upper flange plate, 16 ... lower flange plate, 17 ... floor slab, 18 ... support seat, 19 ... traction member, 20 ... jack, 21 ... cylinder rod, 22 ... cylinder, 23 ... stopper flange, 24 ... Hydraulic or pneumatic chamber, 25 ... Fluid pressure supply port, 26 ... Connecting plate, 27 ... Truss girder, 28 ... Diagonal material

Claims (3)

A beam between the bridge piers is extended horizontally in the bridge length direction, and a load receiving material is provided integrally with the bridge that can be extended between the bridge piers. A structure for reinforcing a bridge, characterized in that a pushing-up means for pushing up and pushing up the bridge through the load receiving material is provided. Reinforcing structure of the bridge according to claim 1, characterized in that the screw jack to said push-up means for holding a position pushed up by screwing. The bridge reinforcing structure according to claim 1, wherein the load receiving material is provided integrally with a floor slab or a bridge girder that forms the bridge.

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