Misaligned joint structure of crossbeam of curve bridge of interchange hub

Abstract

The application discloses a kind of interworking hub curve bridge beam cross diaphragm misplacement order connection structure, including bridge upper portion, the two sides of bridge upper portion are spaced apart and provided with several cross diaphragm steels, the inner end of several cross diaphragm steels located in the same side of bridge upper portion is fixed on bridge upper portion by short cross diaphragm;Two short cross diaphragms relatively arranged between adjacent two bridge upper portions are connected in order by cast-in-place structure, so that several bridge upper portions are connected horizontally to form bridge structure.The application relates to the field of bridge construction technology, and can solve the problems of narrow application range of reinstallation or adjustment of the position of the diaphragm, high cost of customizing the diaphragm that meets the design angle, and increase of the weight of the beam body by increasing the size of the diaphragm.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a staggered and sequential connection structure for transverse diaphragms of a curved bridge at an interchange. Background Technology

[0002] To ensure the lateral stiffness of the superstructure, bridge structures typically employ transverse connections between the webs of precast superstructure beams. This is achieved through bridge diaphragms 1 and their cast-in-place sections 2, which are laterally adjacent to the superstructure sections 3 of the bridge, as shown in the attached diagram. Figure 1 As shown. Because the bridge is located on a curve, the upper part 3 of the bridge needs to be set with an oblique angle. Considering the various angles of the precast beams, there may be deviations or misalignments in the positions of the bridge diaphragms 1 of two adjacent upper parts 3 of the bridge. This results in the bridge diaphragms 1 and their cast-in-place parts 2 forming a broken line shape after connection. This situation may have a negative impact on the stability and safety of the bridge, so measures need to be taken to correct it.

[0003] Specific corrective measures may vary depending on the situation, but generally include the following: 1) Reinstalling or adjusting the position of the diaphragms to align them and improve bridge stability, but this is only suitable for situations where the angle change is small and the types of diaphragms are limited. 2) Customizing diaphragms to match the design angle, but this requires a large number of formwork panels, resulting in high formwork costs. 3) Increasing the size of the diaphragms to cover the misalignment between the diaphragms and the main beam. Reinforcing bars are needed to connect the diaphragms laterally. Examples include: increasing the size of the cast diaphragms to solve the misalignment problem; increasing the size of the cast diaphragms by adding reinforcing bars and steel mesh; and increasing the cross-sectional dimensions of the diaphragms, thus increasing the beam's self-weight.

[0004] Therefore, there is a need for a staggered and sequential connection structure for the transverse diaphragms of curved bridges at interchanges, which can solve the problems of narrow applicability of reinstalling or adjusting the position of the diaphragms in the existing technology, high cost of customizing transverse diaphragms to meet the design angle, and increased beam self-weight due to increased transverse diaphragm size. Summary of the Invention

[0005] The purpose of this invention is to provide a staggered and sequential connection structure for the transverse diaphragms of a curved bridge at an interchange, which can solve the problems of narrow applicability of reinstalling or adjusting the position of the diaphragms in the prior art, high cost of customizing transverse diaphragms to meet the design angle, and increased beam self-weight due to increased transverse diaphragm size.

[0006] This invention is implemented as follows:

[0007] A staggered and sequential connection structure for transverse diaphragms of a curved bridge at an interchange includes a bridge superstructure. Several transverse diaphragm steel bars are spaced apart on both sides of the bridge superstructure. The inner ends of several transverse diaphragm steel bars on the same side of the bridge superstructure are fixed to the bridge superstructure by short transverse diaphragms. Two short transverse diaphragms arranged opposite each other between two adjacent bridge superstructures are sequentially connected by a cast-in-place structure, so that several bridge superstructures are laterally connected to form a bridge structure.

[0008] The angle between the plane where the short transverse diaphragm is located and the axis of the upper part of the bridge is located is within the range of the oblique angle setting of the upper part of the entire bridge.

[0009] The two short transverse diaphragms that are set opposite each other between the upper parts of the two adjacent bridges and the cast-in-place structure between them are located in the same plane.

[0010] The cast-in-place structure includes longitudinal reinforcement and cast-in-place concrete. The two transverse diaphragm reinforcements that are set opposite each other on the upper part of two adjacent bridges are connected by longitudinal reinforcement. The cast-in-place concrete is poured and connected between the two short transverse diaphragms that are set opposite each other on the upper part of two adjacent bridges and wraps the transverse diaphragm reinforcement and longitudinal reinforcement.

[0011] The top surface of the cast-in-place concrete is in the same plane as the top surfaces of the two adjacent bridge sections, and the bottom surface of the cast-in-place concrete is in the same plane as the bottom surfaces of the two short transverse diaphragms that are opposite each other on the upper parts of the two adjacent bridge sections.

[0012] One end of the short transverse diaphragm is connected to the side edge of the upper part of the bridge, and the other end of the short transverse diaphragm has a sloping structure. The other end of the short transverse diaphragm is located inside the outer edge of the upper flange of the upper part of the bridge.

[0013] The outer ends of several transverse diaphragm bars located on the same short transverse diaphragm are on the same straight line, and the straight line is parallel to the inclined structure at the other end of the short transverse diaphragm.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This invention, by incorporating short transverse diaphragms and cast-in-place structures, increases the adjustable connection space between adjacent bridge superstructures by shortening the width of the short transverse diaphragms. This improves the straightness of the connection between the longitudinal reinforcing bars and the two oppositely arranged transverse diaphragm reinforcing bars, thereby improving the straightness of the connection between the cast-in-place concrete and the two oppositely arranged short transverse diaphragms. The angle of the transverse diaphragms between the two bridge superstructures is effectively controlled. This ensures the overall stress effect of the bridge without increasing the cross-section of the transverse diaphragms, without increasing the self-weight of the bridge, and can effectively prevent structural stress problems during bridge operation.

[0016] 2. The preferred design angle of the short transverse diaphragm of the present invention is the middle value of the range of oblique angles set on the upper part of the entire bridge. Therefore, it can be applied to the curved misaligned connection parts on the upper part of the entire bridge. There is no need to reinstall the transverse diaphragm, nor is there a need to customize the installation of transverse diaphragms and configure multiple sets of templates. It takes into account both technical feasibility and construction economy, solves the problem of misaligned transverse diaphragm connection on curved bridges, and ensures the construction quality and structural safety of the bridge. Attached Figure Description

[0017] Figure 1 This is a construction diagram of the misalignment of the transverse diaphragm in a curved bridge using existing technology.

[0018] Figure 2 This is a cross-sectional view of the staggered and sequential connection structure of the transverse diaphragm of the curved bridge at the interchange of the present invention;

[0019] Figure 3 This is a construction schematic diagram of the staggered and sequential connection structure of the transverse diaphragm of the curved bridge at the interchange of the present invention.

[0020] In the diagram, 1 is the bridge diaphragm, 2 is the cast-in-place section, 3 is the bridge superstructure, 301 is the diaphragm reinforcement, 302 is the short diaphragm, 4 is the cast-in-place structure, 401 is the longitudinal reinforcement, and 402 is the cast-in-place concrete. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Please see the appendix Figure 1 and attached Figure 3 A staggered and sequential connection structure for transverse diaphragms of an interchange hub curved bridge includes a bridge superstructure 3. Several transverse diaphragm steel bars 301 are spaced apart on both sides of the bridge superstructure 3. The inner ends of several transverse diaphragm steel bars 301 located on the same side of the bridge superstructure 3 (i.e., the end closer to the bridge superstructure 3) are fixed to the bridge superstructure 3 by short transverse diaphragms 302. Two short transverse diaphragms 302 arranged opposite to each other between two adjacent bridge superstructures 3 are sequentially connected by a cast-in-place structure 4, so that several bridge superstructures 3 are laterally connected to form a bridge structure.

[0023] By replacing the existing transverse diaphragms with short transverse diaphragms 302, the width of the short transverse diaphragms 302 is shortened, increasing the space between the two short transverse diaphragms 302 that are opposite each other on the upper part 3 of two adjacent bridges. This increases the adjustability of the cast-in-place structure 4 when connected between the two short transverse diaphragms 302, thereby enabling the cast-in-place structure 4 to smoothly connect the two short transverse diaphragms 302 and ensuring the stability and safety of the bridge.

[0024] The angle between the plane of the short transverse diaphragm 302 and the axis of the upper part 3 of the bridge is located within the range of the oblique angle setting of the upper part 3 of the entire bridge.

[0025] When the skew angle of the entire bridge superstructure 3 is set within the range of 114.3° to 123.8°, the angle between the plane where the short transverse diaphragm 302 is located and the axis of the bridge superstructure 3 is located is controlled between 114.3° and 123.8°, preferably the middle value of 120°, so that the short transverse diaphragm 302 can be used for the skew angle of the entire bridge superstructure 3.

[0026] The two short transverse diaphragms 302 that are arranged opposite each other between the upper parts 3 of the two adjacent bridges and the cast-in-place structure 4 between them are located in the same plane, ensuring the straightness of the connection between the cast-in-place structure 4 and the two short transverse diaphragms 302.

[0027] Please see the appendix Figure 3 The cast-in-place structure 4 includes longitudinal reinforcement 401 and cast-in-place concrete 402. The two transverse diaphragm reinforcements 301 that are set opposite each other on the upper part 3 of two adjacent bridges are connected by longitudinal reinforcement 401. The cast-in-place concrete 402 is poured and connected between the two short transverse diaphragms 302 that are set opposite each other on the upper part 3 of two adjacent bridges and wraps the transverse diaphragm reinforcement 301 and longitudinal reinforcement 401.

[0028] The parallel reinforcement 401 is used to connect two oppositely arranged transverse diaphragm reinforcements 301. Due to the increased space between the two short transverse diaphragms 302, the parallel reinforcement 401 has greater adjustability when connecting, which can maximize the straightness of the reinforcement connection, and thus enable the cast-in-place concrete 402 to be connected straight between the two short transverse diaphragms 302.

[0029] Please see the appendix Figure 3 The top surface of the cast-in-place concrete 402 is in the same plane as the top surfaces of the two adjacent upper parts 3 of the bridge, ensuring the surface of the bridge structure is flat. The bottom surface of the cast-in-place concrete 402 is in the same plane as the bottom surfaces of the two short transverse diaphragms 302 that are opposite each other on the two adjacent upper parts 3 of the bridge, ensuring reliable force transmission between the two short transverse diaphragms 302 through the cast-in-place structure 4.

[0030] One end of the short transverse diaphragm 302 is connected to the side edge of the upper part of the bridge 3, and the other end of the short transverse diaphragm 302 has a sloping structure. The other end of the short transverse diaphragm 302 is located inside the outer edge of the upper flange of the upper part of the bridge 3.

[0031] The other end of the short transverse diaphragm 302 is located inside the outer edge of the upper flange of the bridge superstructure 3. Compared with the transverse diaphragm of the prior art, the width is smaller (the other end of the transverse diaphragm of the prior art is flush with the outer edge of the upper flange of the bridge superstructure 3). This can expand the space between two adjacent bridge superstructures 3, thereby increasing the flexibility of the connection of the parallel reinforcement 401 between the transverse diaphragm reinforcement 301, ensuring the straightness of the connection of the parallel reinforcement 401 between the relatively arranged transverse diaphragm reinforcement 301, thus avoiding the formation of a broken line structure between the short transverse diaphragm 302 and the cast-in-place structure 4, and ensuring the overall stress effect of the bridge.

[0032] Please see the appendix Figure 2 The outer ends of several transverse diaphragm steel bars 301 located on the same short transverse diaphragm 302 are on the same straight line, and the straight line is parallel to the inclined structure at the other end of the short transverse diaphragm 302.

[0033] Preferably, the quantity and length of the diaphragm reinforcement 301 can be adjusted according to actual needs.

[0034] In the prior art, the straight line where the outer ends of the diaphragm reinforcement bars are located is parallel to the outer edge of the upper flange of the bridge superstructure 3. When connecting two adjacent bridge superstructures 3, the spacing between the diaphragm reinforcement bars 301 in the prior art is small, the adjustable space is small, and the straightness of the connection of the diaphragm cannot be guaranteed. By arranging the outer ends of several diaphragm reinforcement bars 301 obliquely, the adjustable space between the diaphragm reinforcement bars 301 on both sides is increased, thereby enabling the straight connection of the longitudinal reinforcement bars 401 between the oppositely arranged diaphragm reinforcement bars 301.

[0035] Please see the appendix Figure 2 and attached Figure 3 Example 1:

[0036] In a certain bridge project, the main bridge of the hub is 518m long. The bridge plane is located on the circular curve of the bridge, R=2250m. The superstructure 3 of the bridge adopts prestressed concrete simply supported small box girders or precast small box girders that are initially simply supported and then continuously constructed. The span combination of the superstructure of the left span of the entire bridge is 3×30+(20+40+40)+2(3×30)+(2×40)+2×30m, and the span combination of the superstructure of the entire bridge is 30+(4×40)+2(3×30)+(2×40)+2×30m. The bridge layout is affected by the highway route under the bridge, and the small box girders of the superstructure 3 of the bridge need to be set with more than 20 different oblique angles ranging from 114.3° to 123.8°. If no measures are taken to adjust the transverse diaphragms of the existing technology, the connection between the transverse diaphragms of two adjacent superstructure 3 of the bridge will exhibit angular misalignment.

[0037] Considering the high cost of templates with various oblique angles on the upper part 3 of the bridge, and to avoid increasing the cross-sectional size of the transverse diaphragm, the staggered sequential connection structure of the present invention is adopted. The template of the short transverse diaphragm 302 is customized with the middle value of 120°, and the ends of the transverse diaphragm steel bars 301 are sealed on both sides of the upper part 3 of the bridge.

[0038] In the prior art, the top and bottom outer edges of the diaphragm are aligned with the outer edge of the upper flange of the bridge superstructure, and the diaphragm width of the prior art is relatively wide. In this invention, a short diaphragm 302 with an outer sloping structure is adopted, making the width of the short diaphragm 302 smaller than that of the diaphragm in the prior art. The adjustable space between two adjacent bridge superstructures 3 is large, thereby enabling the diaphragm reinforcement 301 between the oppositely arranged short diaphragms 302 to be connected as straight as possible within this adjustable space through the longitudinal reinforcement 401. This ensures that the oppositely arranged short diaphragms 302 are straightly connected after being cast with cast-in-place concrete 402.

[0039] After the concrete is poured, the straightness between the two short transverse diaphragms 302 and the cast-in-place structure 4 is high, which ensures the connection and support between the two adjacent bridge superstructures 3 of the two short transverse diaphragms 302 and the cast-in-place structure 4. The transverse beams of the bridge can be aligned with each other, ensuring the stability and uniform stress of the bridge structure, ensuring good structural stress of the bridge, and ensuring the safety of the bridge structure in the later operation of the highway.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A staggered, sequential connection structure for transverse diaphragms of a curved bridge at an interchange, characterized in that: The bridge includes the upper part (3), and several transverse diaphragm steel bars (301) are provided at intervals on both sides of the upper part (3). The inner ends of several transverse diaphragm steel bars (301) located on the same side of the upper part (3) are fixed to the upper part (3) of the bridge by short transverse diaphragms (302). Two short transverse diaphragms (302) are arranged opposite to each other between two adjacent upper parts (3) of the bridge by cast-in-place structure (4), so that several upper parts (3) of the bridge are connected laterally to form a bridge structure. The angle between the plane where the short transverse diaphragm (302) is located and the axis of the upper part (3) of the bridge is located is within the range of the oblique angle setting of the upper part (3) of the entire bridge; The cast-in-place structure (4) includes longitudinal reinforcement (401) and cast-in-place concrete (402). The two transverse diaphragm reinforcements (301) on each of the two adjacent bridge upper parts (3) are connected by longitudinal reinforcement (401). The cast-in-place concrete (402) is poured and connected between the two short transverse diaphragms (302) on the two adjacent bridge upper parts (3) and wraps the transverse diaphragm reinforcement (301) and longitudinal reinforcement (401). One side of the short transverse diaphragm (302) is connected to the side edge of the upper part of the bridge (3), the other side of the short transverse diaphragm (302) has a sloping structure, and the other end of the short transverse diaphragm (302) is located inside the outer edge of the upper flange of the upper part of the bridge (3). The outer ends of several transverse diaphragm bars (301) located on the same short transverse diaphragm (302) are on the same straight line, and the straight line is parallel to the inclined structure at the other end of the short transverse diaphragm (302).

2. The staggered and sequential connection structure of the transverse diaphragm of the curved bridge at the interchange according to claim 1, characterized in that: The two short transverse diaphragms (302) that are arranged opposite each other between the upper parts (3) of the two adjacent bridges and the cast-in-place structure (4) between them are located in the same plane.

3. The staggered and sequential connection structure of the transverse diaphragm of the curved bridge at the interchange according to claim 1, characterized in that: The top surface of the cast-in-place concrete (402) is in the same plane as the top surface of the two adjacent upper parts (3) of the bridge, and the bottom surface of the cast-in-place concrete (402) is in the same plane as the bottom surface of the two short transverse diaphragms (302) set opposite to each other on the two adjacent upper parts (3) of the bridge.

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