Bridge anti-drawing device

Abstract

The utility model belongs to the field of bridge engineering, and provides a bridge anti-drawing device which comprises an anchoring steel plate, a force transmission steel plate and a pin shaft. The anchoring steel plate is fixed on the side wall of the bridge pier; the force transmission steel plate is fixed to a steel box girder bottom plate, and a through hole is formed in the side wall of the force transmission steel plate. One end of the pin shaft is embedded in the pier, and the other end of the pin shaft sequentially penetrates through the anchoring steel plate and the through hole. The device solves the problem that the upper structure of the bridge overturns under unfavorable loads such as unbalance loading and wind loading, the anti-overturning stability of the bridge is improved, the stress and deformation requirements of the bridge are met, and the safety of the bridge is improved. And traditional anti-overturning modes such as beam body balance weight and beam body structure adjustment can be replaced, and a new path is developed. The device is simple in structure, complete in function, capable of being machined in a factory and installed on site, capable of effectively controlling the installation quality, remarkable in cost advantage, capable of saving engineering resources and labor cost, capable of shortening the construction period and capable of improving the working efficiency.

Description

Technical Field

[0001] The utility model belongs to the field of bridge engineering, and in particular relates to a bridge anti-pullout device. Background Art

[0002] Considering factors such as the function of the bridge and its overall aesthetics, the bridge deck will be equipped with sound barriers, awnings, landscape decorations, etc. As the windward area of ​​the bridge facade increases, the wind load on the beam increases, and the overturning moment increases accordingly, which directly leads to the risk of overturning of the bridge superstructure. In addition, the unbalanced distribution of pipelines on the bridge also increases the possibility of bridge overturning. In the new bridge regulations, clear requirements are also put forward for the bridge overturning problem. The anti-overturning stability of the bridge must meet the technical requirements of a safety factor of 2.5.

[0003] At present, in the process of bridge design, the overturning resistance is improved by adjusting the beam structure, increasing the beam counterweight or increasing the beam support spacing. However, in actual engineering, there are unfavorable conditions such as limited cross-sectional width of the bridge, inability to widen the support spacing, and limited substructure space, which pose challenges to the bridge's anti-overturning ability. Such problems are particularly prominent in landscape pedestrian bridges. Landscape pedestrian bridges are narrow in width, have a large concentration of crowd load eccentricity, and are generally equipped with landscape decorations. Such bridges have higher requirements for anti-overturning stability.

[0004] Therefore, reducing the risk of bridge overturning and improving the bridge's anti-overturning stability is an engineering and technical problem that needs to be solved urgently. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a bridge anti-pullout device which adopts a combined steel member and can improve the transverse anti-overturning stability of the bridge and avoid the overturning problem of the bridge superstructure.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a bridge anti-pullout device, including an anchoring steel plate, a force transmission steel plate, and a pin shaft;

[0007] The anchoring steel plate is fixed on the side wall of the pier;

[0008] The force transmission steel plate is fixed to the bottom plate of the steel box beam, and a through hole is opened on the side wall of the force transmission steel plate;

[0009] One end of the pin shaft is pre-buried in the pier, and the other end of the pin shaft passes through the anchoring steel plate and the through hole in sequence.

[0010] Preferably, the top end of the force transmission steel plate is welded and fixed to the bottom plate of the steel box girder.

[0011] Preferably, it also includes ribs, which are welded and fixed to the bottom plate of the steel box beam and the force-transmitting steel plate at the same time.

[0012] Preferably, the force - transmitting steel plate is fixedly welded to the four rib plates simultaneously.

[0013] Preferably, it further includes anchor bolts. One end of the anchor bolt is embedded in the pier, and the other end of the anchor bolt is fixed to the anchoring steel plate.

[0014] Preferably, the anchoring steel plate is fixed to the four anchor bolts simultaneously.

[0015] Preferably, the four anchor bolts are respectively located at the four corners of the anchoring steel plate.

[0016] Preferably, the through - hole is a strip - shaped hole arranged in the horizontal direction.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. A bridge anti - pull - out device provided by the present utility model solves the problem of the upper - structure overturning of the bridge under adverse loads such as eccentric loads and wind loads, improves the anti - overturning stability of the bridge, meets the force and deformation requirements of the bridge, enhances the safety of the bridge, and has good social and economic benefits. It can replace traditional anti - overturning methods such as beam - body counterweight and beam - body structure adjustment, and opens up a new path.

[0019] 2. A bridge anti - pull - out device provided by the present utility model has a simple structure, complete functions, is processed in the factory and installed on - site, has significant cost advantages, can save engineering resources, save labor costs, shorten the construction period, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a three - dimensional structure schematic diagram of a bridge anti - pull - out device provided by an embodiment of the present utility model;

[0021] Figure 2 FIG. is a cross - sectional structure schematic diagram of a bridge anti - pull - out device provided by an embodiment of the present utility model;

[0022] Figure 3 FIG. is an elevation structure schematic diagram at the transition pier of a bridge anti - pull - out device provided by an embodiment of the present utility model.

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Steel box girder web; 2. Steel box girder bottom plate; 3. Pier; 4. Bearing and cushion stone; 5. Anchoring steel plate; 6. Force - transmitting steel plate; 7. Pin shaft; 8. Rib plate; 9. Anchor bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] It should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" in the terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For those of ordinary skill in the art, the specific meanings of such terms in the present utility model can be understood according to specific circumstances.

[0027] Embodiment 1

[0028] As Figures 1-3 shown, the steel beam is arranged on the top of the bridge pier 3 through the bearing and the cushion stone 4. There is a risk of overturning of the steel beam. In order to improve the anti-overturning stability of the steel beam, this embodiment provides a bridge anti-pull-out device, including an anchor plate 5, a force transfer plate 6, and a pin shaft 7.

[0029] The anchor plate 5 is fixed on the side wall of the bridge pier 3, and a round hole for the pin shaft 7 to pass through is provided on the side wall of the anchor plate 5.

[0030] The top end of the force transfer plate 6 is welded and fixed to the bottom plate 2 of the steel box girder. The force transfer plate 6 is parallel to the web 1 of the steel box girder, and the force transfer plate 6 is located below the web 1 of the steel box girder. The force transfer plate 6 and the bottom plate 2 of the steel box girder are connected into a whole. A through hole for the pin shaft 7 to pass through is opened on the side wall of the force transfer plate 6.

[0031] One end of the pin shaft 7 is embedded in the bridge pier 3, and the other end of the pin shaft 7 sequentially passes through the anchor plate 5 and the through hole. The pin shaft 7, the anchor plate 5, and the bridge pier 3 are connected into a whole. At the same time, since the pin shaft 7 is inserted into the through hole of the force transfer plate 6, the bottom plate 2 of the steel box girder, the force transfer plate 6, the pin shaft 7, the anchor plate 5, and the bridge pier 3 can form an integral structure.

[0032] Based on the above structure, under the action of extreme adverse loads such as wind load and eccentric load, the bridge inclines transversely. At this time, the force transfer plate 6 generates a vertical displacement along with the bottom plate 2 of the steel box girder. After contacting the pin shaft 7, the overturning force is transmitted to the pin shaft 7 and then to the bridge pier 3. Since the pin shaft 7 and the bridge pier 3 are an integral body with relatively high stiffness, the overturning moment is balanced and the risk of overturning is eliminated.

[0033] Therefore, the bridge anti-pulling device provided by this embodiment solves the problem of the upper structure overturning of the bridge under adverse loads such as eccentric loads and wind loads, improves the anti-overturning stability of the bridge, meets the force and deformation requirements of the bridge, enhances the safety of the bridge, and has good social and economic benefits. It can replace traditional anti-overturning methods such as beam weight and beam structure adjustment, and opens up a new path.

[0034] In this embodiment, it also includes a rib plate 8, and the rib plate 8 is welded and fixed to the steel box girder bottom plate 2 and the force transfer steel plate 6 at the same time. And one force transfer steel plate 6 is welded and fixed to four rib plates 8 at the same time. The setting of the rib plate 8 can effectively improve the connection stability between the force transfer steel plate 6 and the steel box girder bottom plate 2.

[0035] In this embodiment, it also includes anchor bolts 9. One end of the anchor bolts 9 is embedded in the pier 3, and the other end of the anchor bolts 9 is fixed to the anchoring steel plate 5. And the anchoring steel plate 5 is fixed to four anchor bolts 9 at the same time. The four anchor bolts 9 are respectively located at the four corners of the anchoring steel plate 5. The anchor bolts 9 can improve the connection stability between the anchoring steel plate 5 and the pier 3.

[0036] In this embodiment, the through hole is a strip-shaped hole arranged in the horizontal direction. The size of the through hole is calculated and determined according to the longitudinal bridge expansion and contraction deformation of the bridge. Under the action of temperature load, the bridge deforms longitudinally in the bridge direction, and the bridge end produces expansion and contraction. This deformation is satisfied through the through hole of the force transfer steel plate 6.

[0037] To sum up, the bridge anti-pulling device provided by this embodiment can include the following steps when implemented:

[0038] First, process and manufacture the steel beam, force transfer steel plate 6, anchoring steel plate 5, and rib plate 8 respectively in the steel structure processing factory.

[0039] Second, the specifications and dimensions of the force transfer steel plate 6, pin shaft 7, and anchor bolts 9 are calculated and determined according to the overturning moment of the upper structure. The vertical length of the force transfer steel plate 6 is determined according to the total height of the beam bottom support.

[0040] Third, the force transfer steel plate 6 and the pin shaft 7 are matched with each other. The diameter of the pin shaft 7 is smaller than the size of the through hole of the force transfer steel plate 6. The longitudinal bridge dimension of the through hole of the force transfer steel plate 6 is calculated and determined according to the longitudinal bridge expansion and contraction deformation of the bridge.

[0041] Fourth, the through holes of the force transfer steel plate 6 should be arranged centered and symmetrically. At the same time, the weakening of the original cross-section after the holes are opened should be checked to ensure the safety of the main beam structure.

[0042] Fifth, after the processing and welding of each component are completed, use the same painting system as the main beam. And perform pre-assembly in the factory to ensure that the device can be installed accurately and firmly.

[0043] 6. After the acceptance inspection such as the inspection of the steel materials leaving the factory and the dimension recheck is completed, it is transported to the construction site.

[0044] 7. When binding the steel bars at the top of the bridge pier, the embedded anchor bolts 9, the pin shafts 7 and the anchor plates 5 are pre-buried.

[0045] 8. After the casting and curing of the bridge pier are completed and the steel girder is erected, the force transfer plate 6 is installed on the pin shaft 7, and at the average temperature period of a day, the force transfer plate 6 and the rib plate 8 are welded and fixed to the bottom plate 2 of the steel box girder.

[0046] 9. The installation is completed.

[0047] 10. Operating mode:

[0048] 1. Under normal loads, the device does not participate in the force-bearing of the bridge and does not enter the working state.

[0049] 2. Under the action of extreme adverse loads such as wind loads and eccentric loads, the bridge inclines transversely. At this time, the device enters the working state. The force transfer plate 6 generates a vertical displacement along with the bottom plate 2 of the steel box girder. After contacting the pin shaft 7, it transmits the overturning force to the pin shaft 7 and then to the bridge pier 3. Since the pin shaft 7 and the bridge pier 3 are taken as a whole and have a large stiffness, the overturning moment is balanced and the overturning risk is eliminated.

[0050] 3. Under the action of temperature loads, the bridge deforms longitudinally and the bridge ends expand and contract. This deformation amount is satisfied through the through holes of the force transfer plate 6.

[0051] 4. During the operation and maintenance of the bridge, the device should be rust-removed and maintained daily.

[0052] The mechanisms, components and parts that are not described in detail in the specific structure of the present utility model are all existing structures that already exist in the prior art and can be directly purchased from the market.

[0053] The above is only the preferred implementation of the present utility model and is not used to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A bridge anti-pullout device, characterized in that: It comprises an anchoring steel plate (5), a force transmission steel plate (6), and a pin shaft (7); The anchoring steel plate (5) is fixed on the side wall of the pier (3); The force transmission steel plate (6) is fixed to the bottom plate (2) of the steel box beam, and a through hole is opened on the side wall of the force transmission steel plate (6); One end of the pin shaft (7) is pre-buried in the pier (3), and the other end of the pin shaft (7) passes through the anchoring steel plate (5) and the through hole in sequence.

2. A bridge anti-pullout device according to claim 1, characterized in that: The top end of the force transmission steel plate (6) is welded and fixed to the bottom plate (2) of the steel box beam.

3. A bridge anti-pullout device according to claim 2, characterized in that: It also includes a rib plate (8), and the rib plate (8) is welded and fixed to the steel box beam bottom plate (2) and the force transmission steel plate (6) at the same time.

4. A bridge anti-pullout device according to claim 3, characterized in that: The force transmission steel plate (6) is welded and fixed to the four rib plates (8) at the same time.

5. The bridge anti-pullout device according to claim 1, characterized in that: It also includes an anchor bolt (9), one end of which is pre-buried in the pier (3), and the other end of which is fixed to the anchor steel plate (5).

6. The bridge anti-pullout device according to claim 5, characterized in that: The anchoring steel plate (5) is fixed to the four foundation bolts (9) at the same time.

7. The bridge anti-pullout device according to claim 6, characterized in that: The four anchor bolts (9) are respectively located at the four corners of the anchoring steel plate (5).

8. The bridge anti-pullout device according to claim 1, characterized in that: The through holes are strip-shaped holes arranged in a horizontal direction.

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