Multi-span deck type tied arch bridge

Abstract

The utility model discloses a multi-span deck type tied arch bridge which comprises at least two bridge abutments, a plurality of arch rings and bridge floor structures, each arch ring is provided with at least one upward protrusion, the protrusions are in lap joint with the lower surfaces of the bridge floor structures, the bridge floor structures are all carried on the surfaces of the protrusions of the bridge abutments and the arch rings, and the bridge floor structures are used for bearing horizontal force generated by the arch rings. In an actual use scene, due to the function of the bridge floor structure, external force is applied, and the external force can be decomposed into force in the horizontal direction and force in the vertical direction through the arch rings. When the force in the horizontal direction acts on the bridge deck structure, the internal structure of the bridge deck structure can counteract the force in the horizontal direction in a hedging mode. External force is firstly transmitted to the arch rings through the bridge floor structure, then is converted into force in the horizontal direction through the arch rings and then is transmitted back to the bridge floor structure, the force in the horizontal direction is counteracted through the bridge floor structure, and the defect that in the prior art, a deck type arch bridge is not suitable for a soft soil geologic area is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge structures, in particular to a multi-span top-bearing tied-rod arch bridge. Background Art

[0002] The top-bearing arch bridge has a beautiful shape and is in demand all over the country. With the continuous development of demand, a large number of top-bearing arch bridges have been built in my country. The top-bearing arch bridge is a structural system with horizontal thrust, which requires gravity abutments to resist the horizontal thrust. However, since the gravity abutments of this system need to resist the horizontal thrust, this structural system is not suitable for soft soil areas. At the same time, the gravity abutments of traditional top-bearing arch bridges are both bulky and expensive, and the construction is difficult. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect that the top-bearing arch bridge in the prior art is not suitable for soft soil geological areas, and to provide a multi-span top-bearing tie-bar arch bridge.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A multi-span top-supported tie-arch bridge, characterized in that it comprises at least two abutments, a plurality of arch rings and a bridge deck structure, the arch rings having at least one upward protrusion, the protrusion overlapping the lower surface of the bridge deck structure, the bridge deck structure being supported on the protruding surfaces of the abutments and the arch rings, and the bridge deck structure being used to withstand the horizontal forces generated by the arch rings.

[0006] In this solution, in actual use scenarios, the bridge deck structure is subject to external forces due to its function, and the external forces can be decomposed into horizontal forces and vertical forces through the arch ring. Among them, when the horizontal force acts on the bridge deck structure, its internal structure can offset the horizontal force; the external force is first transmitted to the arch ring through the bridge deck structure, and then converted into horizontal force through the arch ring and then transmitted back to the bridge deck structure. The horizontal force is offset by the bridge deck structure, which solves the defect of the prior art that the upper-bearing arch bridge is not suitable for soft soil areas.

[0007] Preferably, the bridge deck structure includes a bridge deck and a plurality of I-beams, the upper portions of the plurality of I-beams are connected to the bridge deck, and the plurality of I-beams are laterally spaced apart along an extension direction of the bridge deck.

[0008] In this solution, the bridge deck and the I-beam can form a bridge deck structure, which is placed on the arch ribs. The bridge deck structure can balance the horizontal force generated by the arch ribs.

[0009] Preferably, the multi-span top-bearing tie-arch bridge further comprises an anchoring structure, and the anchoring structure is used to connect the bridge deck structure with the arch ring;

[0010] One end of the anchoring structure close to the abutment is mounted on the abutment.

[0011] In this solution, the anchoring structure is used to firmly connect the bridge deck structure and the arch ring together, acting as an intermediary structure for the connection between the two, improving the reliability of the connection between the bridge deck structure and the arch ring, and providing convenience for the connection between the two. Through the structural characteristics of the arch ring itself, the vertical force is converted into horizontal force and transmitted to the bridge deck structure through the anchoring structure. The bridge deck structure offsets the horizontal force based on its structural characteristics, so that the abutment does not need to bear the horizontal force.

[0012] Preferably, the multi-span top-supported tie-arch bridge comprises a plurality of bridge piers, a plurality of arch rings are arranged in sequence along a horizontal direction, and two ends of the arch rings are respectively connected to adjacent bridge piers.

[0013] In this solution, the arch ring is directly connected to the bridge deck structure, so as to bear the vertical force exerted on the bridge deck structure. At the same time, the arch ring can transfer the vertical reverse force exerted on it to the bridge pier, thereby realizing force conduction.

[0014] Preferably, the reinforcement of the arch ring near the abutment extends into the anchoring structure.

[0015] In this solution, the steel bars of the arch ring near the abutment extend into the anchoring structure, so that the arch ring is more stably connected to the anchoring structure.

[0016] Preferably, the multi-span top-supported tie-arch bridge further comprises a support, and two opposite surfaces of the support are respectively connected to the bridge deck structure and the protrusion.

[0017] In this scheme, there is no fixed connection between the bridge deck structure and the arch ribs, and the supports are placed on the arch ribs, which reduces the hyperstatic dimension of the structure and reduces the constraint force under the influence of temperature and other factors.

[0018] Preferably, the anchoring structure comprises a steel beam web, and the shear nails are penetrated through the steel beam web and are located in the middle of the steel beam web.

[0019] In this solution, by welding shear nails into the web of the steel beam, the bridge deck and the I-beam can be integrated through the shear nails and placed on the arch rib. The bridge deck structure balances the horizontal force generated by the arch rib through the anchor structure.

[0020] Preferably, the anchoring structure comprises a steel beam web, the steel beam web is provided with a plurality of holes, and the holes are used for installing steel bars.

[0021] In this solution, multiple holes are provided and steel bars are inserted into the holes, thereby improving the integrity of the concrete and I-beam in the anchoring structure.

[0022] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0023] The positive and progressive effect of the utility model is that in the actual use scenario, the bridge deck structure is subjected to external force due to its function, and the external force can be decomposed into horizontal force and vertical force through the arch ring. Among them, when the horizontal force acts on the bridge deck structure, its internal structure can offset the horizontal force; and the external force is first transmitted to the arch ring through the bridge deck structure, and then converted into horizontal force through the arch ring and then transmitted back to the bridge deck structure, and the horizontal force is offset by the bridge deck structure, which solves the defect of the prior art that the upper-bearing arch bridge is not suitable for soft soil areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front elevation schematic diagram of a multi-span top-bearing tie-arch bridge according to an embodiment of the utility model.

[0025] Figure 2 It is a schematic cross-sectional view of a multi-span top-bearing tied arch bridge according to an embodiment of the utility model.

[0026] Figure 3 It is a front elevation schematic diagram of the anchoring structure of an embodiment of the utility model.

[0027] Figure 4 A schematic cross-sectional view of the anchoring structure of an embodiment of the utility model

[0028] Description of reference numerals:

[0029] Middle Collapse Arch 1

[0030] Side span arch 2

[0031] Bump 111

[0032] Abutment 3

[0033] Bridge deck structure 4

[0034] Support 5

[0035] Anchor structure 6

[0036] Pier 7

[0037] Shear nail 8

[0038] Hole 9

[0039] Steel bar 10

[0040] I-beam 11

[0041] Bridge deck 12

[0042] Steel beam web 13

[0043] Arch 14 DETAILED DESCRIPTION

[0044] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0045] like Figure 1 and Figure 2 As shown, a multi-span top-supported tie-arch bridge includes at least two abutments 3, a plurality of arch rings 14 and a bridge deck structure 4. The arch ring 14 has at least one upward protrusion 111, and the protrusion 111 overlaps the lower surface of the bridge deck structure 4. The bridge deck structure 4 is carried on the protruding surfaces of the abutments 3 and the arch rings 14. The bridge deck structure 4 is used to withstand the horizontal force generated by the arch rings 14. In this embodiment, the protrusion 111 refers to the area on the arch ring 14 that is in direct contact with the bridge deck structure 4. The arch ring 14 and the bridge deck structure 4 are carried in a manner, and are not fixedly connected. At the same time, the connection method of the protrusion 111 to the lower surface of the bridge deck structure 4 is also only a contact method, and is not fixedly connected.

[0046] In actual use, the upper arch bridge is provided with a bridge deck structure 4, i.e., a "tie beam" to bear horizontal thrust; the steel-concrete composite bridge deck structure 4 is used to bear the role of the tie beam, which not only simplifies the bridge structure and improves economic efficiency, but also simplifies the construction steps and reduces the construction time. The bridge deck structure 4 is subjected to external forces due to its function, and the external forces can be decomposed into horizontal forces and vertical forces through the arch ring. Among them, when the horizontal force acts on the bridge deck structure 4, its internal structure can offset the horizontal force. At the same time, with respect to the vertical force, the bridge deck structure 4 can transmit the vertical force to the arch ring 14 by connecting with the protrusion 111 of the arch ring 14, and partially convert the vertical force into horizontal force through the structural characteristics of the arch ring 14 itself. The horizontal force is transmitted to the bridge deck structure 4 through the anchoring structure 6, and the horizontal force is offset by the bridge deck structure 4, so that the abutment 3 does not need to bear the horizontal force in the end. Therefore, in a preferred embodiment, the abutment 3 uses a lightweight abutment, which solves the defect that the upper-supported arch bridge in the prior art is not suitable for soft soil geological areas.

[0047] like Figure 1 and Figure 2As shown, the bridge deck structure 4 includes a bridge deck 12 and a plurality of I-beams 11, the upper portions of the plurality of I-beams 11 are connected to the bridge deck 12, and the plurality of I-beams 11 are arranged at intervals in the transverse direction along the extension direction of the bridge deck 12. The bridge deck 12 and the I-beams 11 can form a bridge deck structure 4, which is placed on the arch ribs, and the bridge deck structure 4 can balance the horizontal force generated by the arch ribs.

[0048] Specifically, in the actual construction process, after the I-beam 11 is installed and anchored in the arch ring 14 , the bracket of the spanning arch component 1221 is removed, and finally the concrete bridge deck 12 is poured.

[0049] like Figure 1 As shown, a reliable steel-concrete anchoring structure 6 is provided between the bridge deck structure 4 and the arch ring 14 to connect the bridge deck structure 4 with the arch ring 14; one end of the anchoring structure 6 close to the abutment 3 is mounted on the abutment 3. The anchoring structure 6 is used to firmly connect the bridge deck structure 4 with the arch ring 14, acting as an intermediary structure for the connection between the two, improving the reliability of the connection between the bridge deck structure 4 and the arch ring 14, and providing convenience for the connection between the two. Through the structural characteristics of the arch ring 14 itself, the vertical force is converted into a horizontal force and transmitted to the bridge deck structure 4 through the anchoring structure 6. The bridge deck structure 4 offsets the horizontal force based on the structural characteristics, so that the abutment 3 does not need to bear the horizontal force.

[0050] like Figure 1 As shown, the multi-span top-bearing tie-arch bridge includes a plurality of bridge piers 7, a plurality of arch rings 14 are arranged in sequence along the horizontal direction, and the two ends of the arch rings 14 are respectively connected to the adjacent bridge piers 7. The arch rings 14 are directly connected to the bridge deck structure 4, so as to bear the vertical force exerted on the bridge deck structure 4, and at the same time, the arch rings 14 can transmit the vertical reverse force exerted on them to the bridge piers 7, so as to realize the conduction of force.

[0051] In a preferred embodiment, the number of arch rings 14 is three spans. In other preferred embodiments, the number of arch rings 14 is not limited to three spans, and is divided into two side span arches 2 close to the abutment 3 and a middle span arch 1 connected to the two side span arches 2 at both ends. The two side span arches 2 are semi-arches, and the middle span arch 1 is a full arch. In other embodiments, there is no limitation on the number of side span arches 2 and middle span arches 1, and they can be any preferred combination.

[0052] The steel bars 10 of the arch ring 14 near the abutment 3 extend into the anchor structure 6 , so that the arch ring 14 is more stably connected to the anchor structure 6 .

[0053] like Figure 1As shown, the multi-span top-supported tie-arch bridge further includes a support 5, and two opposite surfaces of the support 5 are respectively connected to the bridge deck structure 4 and the protrusion 111. There is no fixed connection between the bridge deck structure 4 and the arch rib, and the support 5 is placed on the arch rib, which reduces the hyperstatic dimension of the structure and reduces the constraint force under the influence of temperature and the like.

[0054] Specifically, in the present embodiment, the supports 5 are all made of rubber. Of course, any other material that can achieve the same effect may be used, and is not limited to rubber.

[0055] like Figure 3 and Figure 4 As shown, the anchor structure 6 includes a steel beam web 13, and the shear nail 8 is penetrated in the steel beam web 13 and located in the middle of the steel beam web 13. By welding the shear nail 8 into the steel beam web 13, the bridge deck 12 and the I-beam 11 can be formed into a whole through the shear nail 8 and placed on the arch rib. The bridge deck structure 4 balances the horizontal force generated by the arch rib through the anchor structure 6.

[0056] The anchor structure 6 includes a steel beam web 13, on which a plurality of holes 9 are provided, and the holes 9 are used to install steel bars 10. By providing a plurality of holes 9, and inserting steel bars 10 in the holes 9, the integrity of the concrete and the I-beam 11 in the anchor structure 6 is improved.

[0057] like Figure 3 As shown, the size of the hole 9 can be adjusted according to actual needs and is not limited here.

[0058] like Figure 3 and Figure 4 As shown, specifically, the portion where the I-beam 11 is combined with the concrete side span arch 2 bears a huge force. The I-beam 11 is raised downward at the end to form a steel-concrete anchoring structure 6. Holes 9 are arranged around the web 13 of the I-beam 11, with a hole diameter of 45 mm and a spacing of 150 mm. The inner area of ​​the web 13 of the steel beam is provided for installing shear nails 8, which have a diameter of 22 mm, a height of 200 mm, and an arrangement spacing of 300 mm. Steel bars 10 are inserted into the holes 9, and the diameter of the steel bars 10 is 28 mm. One steel bar 10 is inserted into each hole 9. After the construction of the shear nails 8 of the steel beam and the steel bars 10 inserted into the holes 9 is completed, concrete is poured at the beam end to form a steel-concrete anchoring structure 6.

[0059] Specifically, the specific on-site construction method involved in this embodiment is as follows: 1. After accepting the task, the construction unit must study the design documents, drawings and materials and conduct a careful on-site study. If any problems are found, they should be promptly reported to the design unit and construction should not be carried out in a hurry; 2. First, a cofferdam is constructed in the river channel to isolate the water body, and then the riverbed is hardened to prepare for the support construction; 3. The lower structures such as pile foundations, piers 7 and abutments 3 are constructed; 4. Full-span supports are set up to construct the middle span arch and side span arch 2. When constructing the side span arch 2, pay attention to pre-embedded anchoring structure 6; 5. Lifting and construction of I-beam beams 11, welded together in stages, and placed on the support 5; 6. After the I-beam beams 11 are installed in place, all full-span supports of the entire bridge are removed. The support removal should be symmetrical, and removed from the center of the river channel to both sides in sequence; 7. After the support is removed, the I-beam beam 11 bears the horizontal thrust generated by all loads. Then a template is set up on the steel beam, and the concrete bridge deck 12 is cast in an inverted hanging manner. Since the concrete bridge deck 12 is constructed after the support is removed, the concrete bridge deck 12 only bears the horizontal thrust caused by the live load and shrinkage creep during the use stage. The steel bars 10 and the mixed fibers are arranged in the concrete bridge deck 12, and the horizontal thrust is resisted by controlling the crack width. No pre-stress is set in the bridge deck structure 4; 8. After the main structure of the arch bridge is constructed, the bridge deck ancillary works are constructed.

[0060] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A multi-span top-bearing tied arch bridge, characterized in that: The multi-span top-supported tie-arch bridge includes at least two abutments, multiple arch rings and a bridge deck structure. The arch ring has at least one upward protrusion, which overlaps the lower surface of the bridge deck structure. The bridge deck structure is carried on the protruding surfaces of the abutments and the arch rings, and the bridge deck structure is used to withstand the horizontal forces generated by the arch rings.

2. The multi-span deck-type tied arch bridge according to claim 1, characterized in that: The bridge deck structure includes a bridge deck and a plurality of I-beams, the upper parts of the plurality of I-beams are connected to the bridge deck, and the plurality of I-beams are arranged at intervals in a transverse direction along the extension direction of the bridge deck.

3. The multi-span deck-type tied arch bridge according to claim 1, characterized in that: The multi-span top-bearing tied arch bridge further includes an anchoring structure, and the anchoring structure is used to connect the bridge deck structure with the arch ring; One end of the anchoring structure close to the abutment is mounted on the abutment.

4. The multi-span deck-type tied arch bridge according to claim 3, characterized in that: The multi-span top-bearing tie-arch bridge comprises a plurality of bridge piers, a plurality of arch rings are arranged in sequence along a horizontal direction, and two ends of the arch rings are respectively connected to adjacent bridge piers.

5. The multi-span deck-type tied arch bridge according to claim 4, characterized in that: The reinforcement of the arch ring near the abutment extends into the anchor structure.

6. The multi-span deck-type tied arch bridge according to claim 1, characterized in that: The multi-span top-supported tied arch bridge comprises a support, and two opposite surfaces of the support are respectively connected to the bridge deck structure and the protrusion.

7. The multi-span deck-type tied arch bridge according to claim 3, characterized in that: The anchoring structure comprises a steel beam web, and the shear nails are penetrated through the steel beam web and are located in the middle of the steel beam web.

8. The multi-span deck-type tied arch bridge according to claim 3, characterized in that: The anchoring structure comprises a steel beam web, and a plurality of holes are arranged on the steel beam web, and the holes are used for installing steel bars.

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