A guide beam and mounting structure for bridge incremental launching construction

Abstract

The patent application discloses a guide beam and mounting structure for bridge incremental launching construction, the guide beam comprises two groups of parallel arranged beam bodies and a truss connected between the two groups of beam bodies, the beam body comprises a plurality of front-to-back detachably connected beam segments and Y-shaped beams, the bifurcated end of the Y-shaped beam is used for being fixed with a steel box beam, and the other end is detachably connected with a beam segment located at the last end in the plurality of beam segments. Compared with the prior art, the connection strength can be increased by fixing the Y-shaped beam, the stability of the guide beam is improved, and the connection between the guide beam and the steel box beam can still be guaranteed not to fail under the condition that the length of the guide beam is increased and the weight is increased.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a guide beam and installation structure for bridge jacking construction. Background Technology

[0002] The steel box girder launching construction method is widely used in bridge projects that need to cross rivers or roads. In order to reduce the cantilever length and deformation of the steel box girder during the launching process, a guide beam of a certain length is usually installed at the front end of the steel box girder.

[0003] In actual construction, the geographical environment faced by bridge construction is becoming increasingly complex. For example, when a bridge faces a geographical environment that spans a long-span river or valley, the steel box girder needs to meet the requirements of a large span, and in order to facilitate the jacking construction, the guide beam also needs to be lengthened accordingly. However, the increased self-weight and deflection of the extended guide beam will also increase the negative bending moment and support reaction force of the connection joint with the steel box girder after connection. This requires the connection joint between the guide beam and the steel box girder to have high strength. However, most existing guide beams use H-beams or I-beams and are welded and fixed to the steel box girder. For longer guide beams, the stability of the connection is insufficient, which poses certain safety hazards. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a guide beam and installation structure for bridge jacking construction, so as to solve the problem of jacking construction in the environment of large-span bridges.

[0005] The technical solution adopted in this invention is as follows: A guide beam for bridge jacking construction includes two sets of parallel beam bodies and a truss connecting the two sets of beam bodies. The beam body includes several beam segments that can be detachably connected from front to back and a Y-shaped beam. The bifurcated end of the Y-shaped beam is used to fix it to the steel box girder, and the other end is detachably connected to the last beam segment among the several beam segments. The Y-shaped beam includes a top plate, a bottom plate, and a web between the top plate and the bottom plate. The two sets of top plates, bottom plates, and webs at the bifurcated end of the Y-shaped beam are used to fix it to the edge of the steel box girder. Several transverse stiffening ribs are arranged at intervals along the length direction on both sides of the web. Several end reinforcement plates are vertically evenly distributed on the two webs at the bifurcated end of the Y-shaped beam. One end of the end reinforcement plate is used to be fixed to the steel box girder, and the other end is fixed perpendicularly to the transverse stiffening ribs.

[0006] In a preferred embodiment of the present invention, a web plate connecting plate is fixed between the two webs at the bifurcation end of the Y-shaped beam. The web at the other end of the Y-shaped beam away from the bifurcation end extends from the bifurcation and is fixed perpendicularly to the web plate connecting plate. In this solution, the web plate connecting plate connects the two webs together, making the two webs a whole, which improves the stability of the Y-shaped beam. At the same time, the web plate connecting plate is similar to two large reinforcing plates, which can improve the shear resistance of the Y-shaped beam to a certain extent and further improve the stability of the Y-shaped beam.

[0007] In a preferred embodiment of the present invention, a plurality of top plate reinforcing plates are vertically arranged on the upper side of the top plate at the bifurcation end of the Y-shaped beam. In this embodiment, the top plate reinforcing plates can increase the strength of the welded joint.

[0008] In a preferred embodiment of the present invention, longitudinal stiffening ribs are provided on both sides of the web near the lower edge, and several lower edge reinforcing plates are provided at intervals between the longitudinal stiffening ribs and the bottom plate. The longitudinal stiffening ribs in this solution can improve the bending resistance of the web. The addition of lower edge reinforcing plates between the longitudinal stiffening ribs and the bottom plate can effectively enhance the strength of the lower flange during the jacking process, as the bottom of the guide beam is subjected to greater force. This ensures that the guide beam will not experience local instability when bearing the vertical support force during the jacking process.

[0009] In a preferred embodiment of the present invention, the truss is a parallel chord truss, comprising two sets of symmetrically arranged chords, with several web members interspersed between the two sets of chords. Adjacent web members and chords form a triangular structure. In this design, the chords can withstand axial tension or compression, and the web members can withstand vertical shear force, thus the entire truss structure has good stability.

[0010] As a preferred embodiment of the present invention, reinforcing plates are provided on both sides of the joint between the Y-shaped beam and the beam segment and on both sides of the joint between adjacent beam segments. The lower end of the reinforcing plate is fixed to the bottom plate. In this solution, joint reinforcing plates are provided on both sides of the joint, which can reduce stress concentration at the joint and ensure the rigidity and stability of the connection between the two segments.

[0011] In a preferred embodiment of the present invention, the web plate has an elongated oval-shaped relief hole. In this solution, the relief hole can reduce the self-weight of the guide beam to a certain extent, thereby reducing the deflection of the guide beam. At the same time, the hole on the web plate can also reduce the contact area between the lateral wind load and the web plate, which is beneficial to reducing the impact of wind load on the stability of the guide beam.

[0012] In a preferred embodiment of the present invention, the cross-sections of the several beam segments gradually decrease from back to front. In this scheme, the cross-sections of the several beam segments gradually decrease from back to front, that is, the beam segments further forward have smaller volumes and lighter weights, which can reduce the downward deflection of the guide beam and reduce deformation.

[0013] As another technical solution of the present invention, a guide beam installation structure for bridge jacking construction includes the guide beam and a steel box girder. Several positioning plates are evenly distributed vertically on the outer sides of the two side plates at the front end of the steel box girder, and several end reinforcement plates are connected to the positioning plates one-to-one. Two sets of top and bottom plates at the bifurcation end of the Y-shaped beam are fixed to the upper and lower edges of the steel box girder, respectively. Two web plates at the bifurcation end of the Y-shaped beam are fixed to the left and right edges of the steel box girder, respectively. In this solution, the top, bottom, and web plates at the bifurcation end of the Y-shaped beam are fixed to the four sides of the steel box girder. Through this all-around connection, the guide beam and the steel box girder can be more securely fixed. Furthermore, the positioning plates at the front end of the steel box girder are also connected to the end reinforcement plates, further increasing the connection surface and improving stability.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this solution, the connection between the steel box girder and the Y-shaped beam is such that the bifurcated end of the Y-shaped beam has two top plates, two bottom plates, and two web plates, i.e., two sets of connecting components. Therefore, the connection surface formed by the connection between the bifurcated end of the Y-shaped beam and the steel box girder is nearly twice that of the existing single set of connecting components, making the connection between the guide beam and the steel box girder more reliable. Several end reinforcing plates are also provided on the two web plates at the bifurcated end of the Y-shaped beam. The end reinforcing plates are fixed to the steel box girder. On the one hand, the end reinforcing plates can be used for alignment with the steel box girder. On the other hand, they can further increase the connection surface, improve the shear resistance of the connection joint, and increase the stability of the guide beam. 2. The end reinforcement plate of the Y-shaped beam is connected to the transverse stiffening rib. The end reinforcement plate can transfer the shear force at the connection joint to the transverse stiffening rib, disperse the stress, and improve the shear resistance of the joint. Even with the increase in the length and weight of the guide beam, it can still ensure that the connection between the guide beam and the steel box beam does not fail. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of the Y-shaped beam in an embodiment of the present invention; Figure 4 yes Figure 1 A magnified view of A in the middle.

[0016] The reference numerals in the figures include: Top plate 1, bottom plate 2, web plate 3, transverse stiffening rib 4, longitudinal stiffening rib 5, end reinforcement plate 6, lower edge reinforcement plate 7, positioning plate 8, web plate connecting plate 9, top plate reinforcement plate 10, joint reinforcement plate 11, lightening hole 12, Y-shaped beam 13, beam segment 14, joint 15, chord 16, web member 17. Detailed Implementation

[0017] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0018] In the description of this application, the terms "side", "end", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] See Figure 2 and Figure 3 As shown, this embodiment discloses a guide beam for bridge jacking construction. The guide beam has a total length of 50 meters and can be used between temporary supports with a span of 90 meters. The guide beam includes two sets of parallel beam bodies, which are connected as a whole by a truss. In this scheme, the beam body includes four beam segments 14 and a Y-shaped beam 13 bolted together from front to back. The length of the Y-shaped beam 13 is about 7 meters. The bifurcated end of the Y-shaped beam 13 is used to fix it to the steel box girder, and the other end is bolted to the last beam segment 14. Specifically, the Y-shaped beam 13 includes a top plate 1, a bottom plate 2, and a web plate 3. The bifurcated end of the Y-shaped beam 13 is integrally branched into two sets of top plates 1 and bottom plates 2. Two web plates 3 are welded between the two sets of top plates 1 and bottom plates 2. That is, the bifurcated end of the Y-shaped beam 13 has two sets of top plates 1, bottom plates 2, and web plates 3, wherein the height-to-thickness ratio of the web plate 3 is 150, and the width-to-thickness ratio of the top plate 1 and the bottom plate 2 is 50. Because the web 3 has a large height-to-thickness ratio, even if the overall section meets the requirements for bending and shear resistance, the local section of the web 3 may become unstable under the combined action of bending and shear, which may lead to the failure of the overall section. Therefore, several transverse stiffening ribs 4 are welded at intervals along the length direction on both sides of the web 3, and longitudinal stiffening ribs 5 are welded on both sides of the web 3 near the lower edge.

[0020] Since the joint where the Y-shaped beam 13 is welded to the steel box girder is subjected to the greatest stress, several top plate reinforcing plates 10 are vertically welded on the upper side of the top plate 1 at the bifurcation end of the Y-shaped beam 13, and several end reinforcing plates 6 are also vertically and evenly distributed on the outer side of the two web plates 3 at the bifurcation end of the Y-shaped beam 13 to increase the strength of the welded joint.

[0021] A web plate connecting plate 9 is welded between the two web plates 3 at the bifurcation end of the Y-beam 13. The web plate 3 at the other end of the Y-beam 13 away from the bifurcation end extends from the bifurcation and is welded perpendicularly to the web plate connecting plate 9. The web plate connecting plate 9 connects the two web plates 3 at the bifurcation end of the Y-beam 13 together, making the two web plates 3 a whole, which improves the stability of the Y-beam 13. At the same time, the web plate connecting plate 9 is similar to a large reinforcing plate, which can improve the shear resistance of the Y-beam 13 to a certain extent, and further improve the stability of the Y-beam 13.

[0022] During the jacking process, the bottom of the guide beam is subjected to a large force. Several lower edge reinforcing plates 7 are welded between the longitudinal stiffening ribs 5 and the bottom plate 2. One side of the lower edge reinforcing plate 7 is welded perpendicularly to the web plate 3. The lower edge reinforcing plate 7 can enhance the strength of the lower flange and ensure that the guide beam will not become locally unstable when it is subjected to the vertical support force during the jacking process.

[0023] To ensure the rigidity and stability of the connection between the two segments, joint reinforcement plates 11 are welded to both sides of the joint 15 between the Y-shaped beam 13 and the beam segment 14, and to both sides of the joint 15 between adjacent beam segments 14. In this scheme, the joint reinforcement plate 11 is a folded plate, with the lower end of the folded plate welded to the bottom plate 2 and the side welded to the lower edge reinforcement plate 7.

[0024] To reduce the self-weight of the guide beam and decrease deflection, a relief hole 12 is provided on the web plate 3. In this design, the relief hole 12 is oblong, and the oblong hole has no folded edge, which can avoid stress concentration. By opening a hole on the web plate 3, the contact area between the lateral wind load and the web plate 3 can also be reduced, which is beneficial to reducing the impact of wind load on the stability of the guide beam.

[0025] In this scheme, the cross-section of several beam segments 14 gradually decreases from back to front, that is, the beam segment 14 further forward has a smaller volume and lighter weight. Since the distance is greater, the impact on deflection is greater. This arrangement can reduce the downward deflection caused by the weight of the guide beam and reduce deformation.

[0026] The truss connecting the main beams is a parallel chord truss, including two symmetrically arranged sets of chords 16. Each set of chords 16 includes an upper chord and a lower chord, which are bolted together between the main beams. Several web members 17 are welded between the two sets of chords 16. Adjacent web members 17 and chords 16 form a triangular structure. In this design, the chords 16 can withstand axial tension or compression, and the web members 17 can withstand vertical shear force. The entire truss structure has good stability.

[0027] See Figure 1 and Figure 4As shown, this embodiment also discloses a guide beam installation structure for bridge jacking construction, including the guide beam and steel box girder as described above. The rear end of the guide beam is welded to the front end of the steel box girder. Specifically, the two top plates 1 at the bifurcation end of the Y-shaped beam 13 are respectively welded to both sides of the upper edge of the steel box girder, and the two bottom plates 2 at the bifurcation end of the Y-shaped beam 13 are respectively welded to both sides of the lower edge of the steel box girder. The web plates 3 between the two sets of top plates 1 and bottom plates 2 are respectively welded and fixed to the left and right edges of the steel box girder. By fixing the front end of the steel box girder in all directions, the guide beam and the steel box girder can be fixed more securely.

[0028] See Figure 4 As shown, several positioning plates 8 are evenly distributed vertically on the outer sides of the two side plates at the front end of the steel box girder. Several end reinforcing plates 6 are welded to the positioning plates 8 one by one. At this time, the end reinforcing plates 6 can play the role of aligning with the steel box girder. The other end of the end reinforcing plate 6 is welded perpendicularly to the transverse stiffening rib 4 closest to the steel box girder. At this time, the shear force of the welded joint between the Y-shaped beam 13 and the steel box girder can be transferred to the transverse stiffening rib 4 through the end reinforcing plate 6, dispersing the concentrated stress at the joint and improving the shear resistance of the welded joint. Even with the increase in the length and weight of the guide beam, the connection between the guide beam and the steel box girder can still be guaranteed to remain ineffective.

[0029] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A guide beam for bridge jacking construction, comprising two sets of parallel beam bodies and a connecting beam between the two sets of beams. The truss between the main bodies is characterized by: The main beam consists of several beam segments that can be detachably connected from front to back and a Y-shaped beam. The bifurcated end of the Y-shaped beam is used to fix it to the steel box girder, and the other end is detachably connected to the beam segment located at the last end of the several beam segments. The Y-shaped beam includes a top plate, a bottom plate, and a web between the top and bottom plates. The two sets of top plates, bottom plates, and webs at the bifurcation ends of the Y-shaped beam are used for fixing to the edge of the steel box girder. Several transverse stiffening ribs are spaced along the length of both sides of the web. Several end reinforcement plates are evenly distributed vertically on the two webs at the bifurcation ends of the Y-shaped beam. One end of the end reinforcement plate is used to fix it to the steel box girder, and the other end is fixed perpendicularly to the transverse stiffening ribs. It also includes a steel box girder, on which several positioning plates are evenly distributed vertically on the outer sides of the two side plates at the front end of the steel box girder, and several end reinforcement plates are connected to the positioning plates one by one; the top plate and bottom plate of the bifurcation end of the Y-shaped beam are fixed to the upper and lower edges of the steel box girder respectively, and the two web plates of the bifurcation end of the Y-shaped beam are fixed to the left and right edges of the steel box girder respectively. The end reinforcement plates can be used to align with the steel box girder, and the end reinforcement plates can transfer the shear force at the connection joint to the transverse stiffening ribs to disperse the stress.

2. The guide beam for bridge jacking construction according to claim 1, characterized in that: A web plate connecting plate is fixed between the two webs at the bifurcation end of the Y-shaped beam, and the web at the other end of the Y-shaped beam away from the bifurcation end extends out from the bifurcation and is fixed perpendicularly to the web plate connecting plate.

3. A guide beam for bridge jacking construction according to claim 1, characterized in that: Several top plate reinforcing plates are vertically installed on the upper side of the top plate at the bifurcation end of the Y-shaped beam.

4. A guide beam for bridge jacking construction according to claim 2, characterized in that: The web plate is provided with longitudinal stiffening ribs on both sides near the lower edge, and several lower edge reinforcing plates are provided between the longitudinal stiffening ribs and the bottom plate at intervals.

5. A guide beam for bridge jacking construction according to claim 3, characterized in that: The truss is a parallel chord truss, comprising two symmetrically arranged sets of chords, with several web members interspersed between the two sets of chords, and adjacent web members forming a triangular structure with the chords.

6. A guide beam for bridge jacking construction according to claim 4, characterized in that: Reinforcing plates are provided on both sides of the joint between the Y-shaped beam and the beam segment, and on both sides of the joint between adjacent beam segments. The lower end of the reinforcing plate is fixed to the base plate.

7. A guide beam for bridge jacking construction according to claim 5, characterized in that: The web has elongated, oval-shaped light-reducing holes.

8. A guide beam for bridge jacking construction according to claim 6, characterized in that: The cross-section of several of the beam segments gradually decreases from back to front.

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