Combined construction structure of newly-built underground structure and existing bridge
By building a joint structure of a new underground structure and an existing bridge under the bridge, and using technical means such as cogging interface, planting ribs, support components and embedded steel plates, the problems of long construction processes in the existing technology, affecting the use of the original bridge and poor economic benefits are solved, and the construction process is simplified, shortening the construction period, ensuring the normal operation of the bridge and improving economic benefits are achieved.
Patent Information
- Application Number
- CN202421931775.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-09
AI Technical Summary
When the existing technology builds a new underground structure under the bridge, the construction process is long, affects the use of the original bridge and has poor economic benefits.
The combined structure of newly built underground structures and existing bridges is adopted, including the original bridge bearing, the new underground structure, the new support components and some original bridge pile foundations. Through technical means such as cogging interfaces and planting tendons, the stable connection between the new underground structure and the original bridge bearing is ensured, and the new support components and embedded steel plates are used to improve bearing capacity and stability.
The construction process is simplified, the construction period is shortened, the construction disturbance is reduced, the normal operation of existing bridges is ensured, and the stability and economic benefits of the joint construction structure are improved.
Smart Images
Figure CN222862350U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of underground structure construction, in particular to a construction structure for newly building an underground structure under a bridge. Background Art
[0002] In the construction of underground structures such as subways and tunnels, new underground structures often cross existing bridges and even conflict with the location of bridge pile foundations. In this case, the pile foundation of the bridge needs to be replaced to ensure the joint construction of the bridge and the underground structure.
[0003] At present, the construction of bridge pile foundation underpinning generally adopts a one-time pile foundation underpinning technology, that is, the affected bridge foundation is replaced to a newly built foundation outside the construction range of the underground structure foundation pit. After the original bridge pile foundation and piers are removed, the main structure of the underground structure is constructed. This construction method requires separate construction of each part, a long construction process, and many original bridge piers are removed. It may also affect the use of the original bridge and affect the economic benefits. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the deficiencies and defects mentioned in the above background technology and provide a new underground structure and an existing bridge combined structure which is convenient to construct, can operate normally when replacing the supporting bridge, and is economically feasible.
[0005] In order to solve the above technical problems, the technical solution proposed by the utility model is:
[0006] A combined structure of a newly built underground structure and an existing bridge, comprising an original bridge pedestal, a newly built underground structure, a newly built support assembly and part of the original bridge pile foundation, wherein the original bridge pedestal is fixedly arranged in the top plate of the newly built underground structure, the newly built support assembly is located on both sides of the newly built underground structure, supports on both sides of the top plate of the newly built underground structure are arranged on the newly built support assembly, and part of the original bridge pile foundation supports are arranged under the bottom plate of the newly built underground structure.
[0007] In the above-mentioned combined structure, preferably, the newly built support assembly includes retaining piles, a crown beam and a jacking device, wherein the retaining piles are located on both sides of the newly built underground structure, the crown beam is located on the retaining piles, and the jacking device is located on the crown beam. The jacking device can apply axial force to assist in controlling the settlement of the top plate of the newly built underground structure and the overall structure of the viaduct pier within a safe range during construction. The jacking device can be a jack or a similar device.
[0008] In the above-mentioned combined structure, preferably, the outer surface of the original bridge cap is provided with a tooth-groove interface, and the embedded steel bars in the top plate of the newly built underground structure extend into the original bridge cap. By providing the tooth-groove interface, the bite force of the interface between the top plate of the newly built underground structure and the original bridge cap is increased, and the bearing capacity of the interface between the top plate of the newly built underground structure and the original bridge cap is improved. The top plate of the newly built underground structure and the original bridge cap are combined by embedding steel bars, ensuring the stability of the overall structure of the top plate of the newly built underground structure and the original bridge cap.
[0009] In the above-mentioned combined structure, preferably, embedded steel plates are pre-buried at the bottom of both sides of the top plate of the newly built underground structure, and the newly built support assembly is arranged under the embedded steel plates. By providing the embedded steel plates, the load can be evenly transferred while the bearing capacity is improved, and concrete cracks can be prevented from being generated at the ends of the top plate of the newly built underground structure during the application of axial force.
[0010] In the above-mentioned combined structure, preferably, a side wall is provided between the top plate and the bottom plate of the newly built underground structure, an interface structure for connecting with the side wall is provided below the top plate of the newly built underground structure, and the interface structure and the side wall are connected by post-cast concrete. The presence of post-cast concrete can prevent harmful cracks in the concrete structure of the side wall due to its own shrinkage or uneven settlement, thereby ensuring the integrity and stability of the top plate and side wall of the newly built underground structure.
[0011] In the above-mentioned combined structure, preferably, the interface structure is provided with a reserved dowel extending downward, and the reserved dowel extends downward into the post-cast concrete and the side wall. By providing the reserved dowel and extending the reserved dowel downward into the post-cast concrete and the side wall, the bearing capacity of the post-cast concrete structure can be improved, ensuring that the top plate and the side wall of the newly built underground structure are well connected.
[0012] In the above-mentioned combined structure, preferably, a middle partition wall is provided between the top plate and the bottom plate of the newly built underground structure, the middle partition wall is located below the original bridge pedestal, and an interface structure for connecting with the middle partition wall is provided below the top plate of the newly built underground structure, and the interface structure and the middle partition wall are connected by post-cast concrete. The presence of post-cast concrete can prevent harmful cracks in the concrete structure of the middle partition wall due to its own shrinkage or uneven settlement, and ensure the integrity and stability of the top plate and the middle partition wall of the newly built underground structure. At the same time, the middle partition wall is located below the original bridge pedestal, which can be used to assist the newly built support assembly and side wall in bearing the load on the pedestal, and the structural stability is better.
[0013] In the above-mentioned combined structure, preferably, the interface structure is provided with a reserved dowel extending downward, and the reserved dowel extends downward into the post-cast concrete and the middle partition wall. By providing the reserved dowel and extending the reserved dowel downward into the post-cast concrete and the middle partition wall, the bearing capacity of the post-cast concrete structure can be improved, ensuring that the top plate and the middle partition wall of the newly built underground structure are well connected.
[0014] In the above-mentioned combined structure, preferably, part of the original bridge pile foundation is fixedly connected to the bottom plate of the newly built underground structure, and part of the original bridge pile foundation has the original bridge pile foundation steel bars extending into the bottom plate of the newly built underground structure. Part of the original bridge pile foundation can be used to support the newly built underground structure, and it is necessary to ensure that the two are stably connected. The utility model can ensure that the pile foundation is tightly connected to the bottom plate of the newly built underground structure by extending the original bridge pile foundation steel bars into the bottom plate of the newly built underground structure.
[0015] In the above-mentioned combined construction structures, the newly built underground structures can be underground projects such as tunnels and subway stations.
[0016] Compared with the prior art, the advantages of the utility model are:
[0017] 1. The combined structure of the newly built underground structure and the existing bridge of the utility model forms the original bridge pier and the newly built underground structure into a whole, without removing the original bridge piers, so that part of the original bridge pile foundation support is set at the bottom of the newly built underground structure, without completely removing the original bridge pile foundation, thus reducing some construction procedures, simplifying the construction process, and greatly shortening the construction period.
[0018] 2. The combined structure of the newly built underground structure and the existing bridge of the utility model constructs the original bridge pedestal, the newly built underground structure, the newly built supporting assembly and part of the original bridge pile foundation as an integrated replacement structure, and uses part of the original bridge pile foundation to support the newly built underground structure, which can reduce construction disturbance, bear load more effectively, and improve the stability of the combined structure.
[0019] 3. The combined structure of the new underground structure and the existing bridge of the utility model utilizes the new supporting components and the new underground structure as the bearing structures at different stages. In the initial stage of construction, the new supporting components and the top plate of the new underground structure can be used to support the bridge. The construction of the underground space structure can be completed without affecting the normal use of the original bridge. It has high economic benefits and can provide guidance for similar projects. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a schematic diagram of the overall structure of the combined structure of the new underground structure and the existing bridge in the embodiment.
[0022] Figure 2 It is a cross-sectional view of the top plate structure of the combined structure of the new underground structure and the existing bridge in the embodiment.
[0023] Figure 3 It is a schematic diagram of the connection structure between the support assembly and the end of the top plate of the newly built underground structure in the embodiment.
[0024] Figure 4 It is a schematic diagram of the structure of the connection part between the newly built underground structure and the existing bridge in the embodiment.
[0025] Legend
[0026] 1. Viaduct pier; 2. Original bridge abutment; 3. Tooth-shaped interface; 4. Top plate; 41. Embedded reinforcement; 42. Interface structure; 43. Embedded steel plate; 44. Reserved dowel bars; 5. Post-poured concrete; 6. Pushing device; 7. Crown beam; 8. Guard piles; 9. Side walls; 10. Middle partition wall; 11. Bottom plate; 12. The removed part of the original bridge pile foundation; 121. The original middle bridge pile foundation; 122. The original left bridge pile foundation; 123. The original right bridge pile foundation; 13. The original bridge pile foundation; 131. The original bridge pile foundation steel bars. DETAILED DESCRIPTION
[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.
[0028] It should be noted that when an element is described as being "fixed, fixed, connected or connected to" another element, it can be directly fixed, fixed, connected or connected to the other element, or it can be indirectly fixed, fixed, connected or connected to the other element through other intermediate connectors.
[0029] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model.
[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.
[0031] Example:
[0032] like Figure 1-Figure 4 As shown, the combined structure of the newly built underground structure and the existing bridge in this embodiment includes the original bridge pedestal 2, the newly built underground structure, the newly built support assembly and part of the original bridge pile foundation 13. The original bridge pedestal 2 is fixed in the top plate 4 of the newly built underground structure, the newly built support assembly is located on both sides of the newly built underground structure, the supports on both sides of the top plate 4 of the newly built underground structure are arranged on the newly built support assembly, and part of the original bridge pile foundation 13 is supported under the bottom plate 11 of the newly built underground structure.
[0033] like Figure 3 As shown, in this embodiment, the newly built support assembly includes retaining piles 8, crown beams 7 and jacking devices 6. The retaining piles 8 are located on both sides of the newly built underground structure, the crown beams 7 are located on the retaining piles 8, and the jacking device 6 is arranged on the crown beams 7.
[0034] like Figure 2 As shown, in this embodiment, a tooth-groove type interface 3 is provided on the outer surface of the original bridge pedestal 2 , and the embedded reinforcement 41 in the top plate 4 of the newly built underground structure partially extends into the original bridge pedestal 2 .
[0035] like Figure 2 , Figure 3 As shown, in this embodiment, embedded steel plates 43 are pre-buried at the bottom of both sides of the top plate 4 of the newly built underground structure, and the newly built supporting assembly is disposed under the embedded steel plates 43 .
[0036] like Figure 3 As shown, in this embodiment, a side wall 9 is provided between the top plate 4 and the bottom plate 11 of the newly built underground structure, and an interface structure 42 for connecting with the side wall 9 is provided below the top plate 4 of the newly built underground structure, and the interface structure 42 and the side wall 9 are connected by post-cast concrete 5.
[0037] In this embodiment, a reserved dowel bar 44 extending downward is provided in the interface structure 42 , and the reserved dowel bar 44 extends downward into the post-cast concrete 5 and the side wall 9 .
[0038] like Figure 4 As shown, in this embodiment, a middle partition wall 10 is provided between the top plate 4 and the bottom plate 11 of the newly-built underground structure. The middle partition wall 10 is located below the original bridge pier 2. An interface structure 42 for connecting with the middle partition wall 10 is provided below the top plate 4 of the newly-built underground structure. The interface structure 42 and the middle partition wall 10 are connected by post-poured concrete 5.
[0039] In this embodiment, a reserved dowel bar 44 extending downward is provided in the interface structure 42 , and the reserved dowel bar 44 extends downward into the post-cast concrete 5 and the middle partition wall 10 .
[0040] In this embodiment, part of the original bridge pile foundation 13 is fixedly connected to the bottom plate 11 of the newly built underground structure, and part of the original bridge pile foundation steel bars 131 in the original bridge pile foundation 13 extend into the bottom plate 11 of the newly built underground structure.
[0041] This embodiment also provides a construction method for a combined structure of a new underground structure and an existing bridge, which specifically includes the following construction steps:
[0042] S1. According to the construction drawings, retaining piles 8 are constructed on both sides of the newly built underground structure, and the positions above the crown beam 7 are all set as empty piles;
[0043] S2, excavate the ground to the bottom elevation of the crown beam 7, and construct the crown beam 7 on the top of the retaining pile 8;
[0044] S3, after the crown beam 7 reaches the strength, the top plate 4 of the new underground structure is constructed: the surface of the original bridge pedestal 2 is roughened, and the tooth-groove interface 3 is obtained in the top plate 4 / pedestal co-construction section, and the embedded steel bars 41 in the top plate 4 of the new underground structure are inserted into the original bridge pedestal 2, and the interface agent is applied to the interface between the new and old concrete, and the concrete is poured so that the top plate 4 of the new underground structure and the original bridge pedestal 2 form a whole. When constructing the top plate 4 of the new underground structure, an interface structure 42 connected to the side wall 9 and the middle partition wall 10 needs to be reserved on the top plate 4, and a reserved dowel bar 44 extending downward is provided in the interface structure 42, and steel plates 43 are embedded at both ends of the top plate 4;
[0045] S4, after the top plate 4 of the newly built underground structure reaches a certain strength, a jacking device 6 is set up between the crown beams 7 on both sides and the embedded steel plates 43 of the top plate 4 of the newly built underground structure, and an initial preload is applied;
[0046] S5, after the top plate 4 of the newly built underground structure and the overall structure of the viaduct pier 1 are stable, continue to dig the foundation pit downward to the base elevation of the newly built underground structure;
[0047] S6, using the jacking device 6 to apply axial force, gradually dismantle the broken part 12 of the original bridge pile foundation:
[0048] S6.1, the jacking device 6 applies the designed axial force value, and at the same time gradually breaks the original middle bridge pile foundation 121 from top to bottom to the bottom plate 11 of the newly built underground structure;
[0049] S6.2, after the structure reaches stability, the pre-designed axial force is applied to the jacking device 6, and the original left bridge pile foundation 122 is gradually broken from top to bottom to the bottom plate 11 of the newly built underground structure;
[0050] S6.3, after the structure reaches stability, the pre-designed axial force is applied to the jacking device 6, and the original right bridge pile foundation 123 is gradually broken from top to bottom to the bottom plate 11 of the newly built underground structure;
[0051] S6.4, in this process, the axial force of the jacking device 6 is adjusted at any time according to the order in which the original bridge pile foundation 13 is broken, so as to ensure the stability of the top plate 4 and the viaduct pier 1 of the newly built underground structure, thereby achieving the effect of active underpinning of the pile foundation;
[0052] S7, after the broken part 12 of the original bridge pile foundation is gradually broken and the structure is stable, the bottom plate 11 of the new underground structure is constructed, and at the same time, the exposed original bridge pile foundation steel bars 131 of the original bridge pile foundation 13 are anchored into the bottom plate 11 of the new underground structure, and concrete is poured to form a whole;
[0053] S8, after the bottom plate 11 of the new underground structure reaches the required strength, the side walls 9 and the middle partition wall 10 of the new underground structure are constructed from bottom to top until the post-cast concrete 5 is reached;
[0054] S9, construct the post-cast concrete structure 5, so that the side walls 9 of the new underground structure and the middle partition wall 10 of the new underground structure are effectively connected with the top plate 4 of the new underground structure to form the whole of the new underground structure.
[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A combined structure of a new underground structure and an existing bridge, characterized in that: The invention comprises an original bridge pedestal (2), a newly built underground structure, a newly built support assembly and part of the original bridge pile foundation (13), wherein the original bridge pedestal (2) is fixedly arranged in the top plate (4) of the newly built underground structure, the newly built support assembly is located on both sides of the newly built underground structure, the two sides of the top plate (4) of the newly built underground structure are supported on the newly built support assembly, and part of the original bridge pile foundation (13) is supported under the bottom plate (11) of the newly built underground structure.
2. The combined structure according to claim 1, characterized in that: The newly built supporting assembly comprises guard piles (8), a crown beam (7) and a jacking device (6); the guard piles (8) are located on both sides of the newly built underground structure; the crown beam (7) is located on the guard piles (8); and the jacking device (6) is arranged on the crown beam (7).
3. The combined structure according to claim 1, characterized in that: The outer surface of the original bridge pedestal (2) is provided with a toothed interface (3), and the embedded reinforcement (41) in the top plate (4) of the newly built underground structure partially extends into the original bridge pedestal (2).
4. The combined structure according to claim 1, characterized in that: Embedded steel plates (43) are pre-buried at the bottom of both sides of the top plate (4) of the newly built underground structure, and the newly built support assembly is disposed under the embedded steel plates (43).
5. The combined structure according to claim 1, characterized in that: A side wall (9) is provided between the top plate (4) and the bottom plate (11) of the newly built underground structure, an interface structure (42) for connecting with the side wall (9) is provided below the top plate (4) of the newly built underground structure, and the interface structure (42) and the side wall (9) are connected by post-cast concrete (5).
6. The combined structure according to claim 5, characterized in that: The interface structure (42) is provided with a reserved dowel bar (44) extending downwards, and the reserved dowel bar (44) extends downwards into the post-cast concrete (5) and the side wall (9).
7. The combined structure according to claim 1, characterized in that: A middle partition wall (10) is provided between the top plate (4) and the bottom plate (11) of the newly built underground structure, and the middle partition wall (10) is located below the original bridge pedestal (2). An interface structure (42) for connecting with the middle partition wall (10) is provided below the top plate (4) of the newly built underground structure, and the interface structure (42) and the middle partition wall (10) are connected by post-cast concrete (5).
8. The combined structure according to claim 7, characterized in that: The interface structure (42) is provided with a reserved dowel bar (44) extending downwards, and the reserved dowel bar (44) extends downwards into the post-cast concrete (5) and the middle partition wall (10).
9. The combined structure according to claim 1, characterized in that: Part of the original bridge pile foundation (13) is fixedly connected to the bottom plate (11) of the newly built underground structure, and part of the original bridge pile foundation (13) has original bridge pile foundation steel bars (131) extending into the bottom plate (11) of the newly built underground structure.