Pier reinforcing device for shield tunnel side penetrating railway bridge construction
By setting up continuous walls and interlayer structures between the tunnel and the railway bridge, and using buffer reinforcement components and concrete reinforcement liquid, the problem of disturbance to the railway bridge during tunnel construction was solved, achieving construction safety and cost control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU RAILWAY (GROUP) CORPORATION
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-08
AI Technical Summary
Existing technologies cannot effectively prevent the disturbance to existing railway bridges during shield tunnel construction. In particular, when the vibration force is too large, it may still cause deformation or displacement of the railway bridge foundation and superstructure, affecting the safety of the railway bridge.
A bridge pier reinforcement device is adopted, which involves setting up multiple layers of continuous walls and interlayers between the pre-excavated tunnel and the railway bridge pier, and using buffer reinforcement components and concrete reinforcement liquid for reinforcement to form an isolation and buffer structure, thereby reducing the transmission of disturbance forces.
Effectively isolate the disturbance forces during tunnel excavation to prevent impact on railway bridges, ensure construction safety, and avoid tunnel construction delays and additional costs.
Smart Images
Figure CN224213382U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tunnel construction technology, and in particular to a bridge pier reinforcement device for the construction of a shield tunnel crossing a railway bridge. Background Technology
[0002] With the continuous development of urban rail transit, the spatial intersection between urban tunnels and the foundations of existing railway bridges is inevitable. When a tunnel crosses an existing railway bridge, the construction of a new tunnel passing through or adjacent to the existing railway bridge will inevitably disturb the strata above and around it, directly causing varying degrees of deformation, displacement, and increased internal stress in the railway bridge foundation and superstructure. When this impact exceeds the allowable safety control range of the existing railway bridge, it will lead to new structural damage or exacerbate existing damage, seriously threatening the safety of the railway bridge's use or structural safety. Furthermore, once the above problems occur, it will inevitably cause delays in tunnel construction, resulting in a series of additional costs and unnecessary impacts and losses. In existing technologies, to avoid impacting the existing railway bridge during tunnel construction, multiple anchor bolt holes are typically drilled between the tunnel to be constructed and the existing railway bridge. Anchor bolts are then inserted into the anchor bolt holes and grouting is performed for reinforcement, thereby strengthening the geological strength around the existing railway bridge and minimizing the impact of tunnel excavation on the existing railway bridge. While this method can reduce the impact on existing railway bridges, if the vibration force is too large during tunnel excavation, it can still be transmitted to the existing railway bridge along the geological layers, potentially causing varying degrees of deformation or displacement of the railway bridge's foundation and superstructure. Utility Model Content
[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a pier reinforcement device for the construction of a shield tunnel side-crossing railway bridge.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A bridge pier reinforcement device for shield tunnel construction of a railway bridge, comprising a pre-excavated tunnel within a geological layer and a railway bridge pier above the geological layer. The foundation columns of the railway bridge pier are set within the geological layer. A first continuous wall, a second continuous wall, and a third continuous wall are set downwards within the geological layer between the railway bridge pier and the pre-excavated tunnel. A first interlayer between the first and second continuous walls is filled with concrete reinforcement liquid for reinforcement. A second interlayer between the second and third continuous walls is provided with a buffer reinforcement component.
[0006] Preferably, a process trench is provided on the upper surface of the geological layer, and the first continuous wall, the second continuous wall and the third continuous wall are all located in the process trench.
[0007] Preferably, the buffer reinforcement includes multiple "bow"-shaped reinforcing rods, with both ends of each reinforcing rod fixed to one side of the third continuous wall, and the multiple reinforcing rods are staggered and overlapped and fixed together with each other.
[0008] Preferably, a steel reinforcement cage is installed in the first mezzanine.
[0009] Preferably, an anchor rod is inserted downward at the bottom of the first interlayer, and the anchor rod extends upward to the top of the first interlayer. The anchor rod passes through the center of the steel cage, and the anchor rod is fixed to the steel cage by a connecting rod.
[0010] The beneficial effects of this utility model are as follows: The bridge pier reinforcement device for shield tunnel construction that passes through a railway bridge is provided with a second interlayer. The second interlayer contains only buffer reinforcement components, which is equivalent to completely isolating the pre-excavated tunnel from the railway bridge pier. Thus, the disturbance force during the tunnel excavation process is eliminated in the second interlayer. Attached Figure Description
[0011] Figure 1 This is the process layout diagram of this utility model;
[0012] Figure 2 This is a schematic diagram of the basic structure of the reinforcement device of this utility model. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0014] like Figure 1 and Figure 2 As shown in the figure, a pier reinforcement device for the construction of a shield tunnel crossing a railway bridge in this embodiment includes a pre-excavated tunnel 400 in a geological layer 100 and a railway pier 200 above the geological layer 100. The foundation column 300 of the railway pier 200 is set in the geological layer 100.
[0015] A process trench 1 is set on the upper surface of the geological layer 100 between the railway bridge pier 200 and the pre-excavated tunnel 400. A first continuous wall 2, a second continuous wall 3 and a third continuous wall 4 are set downward in the process trench 1. The first continuous wall 2, the second continuous wall 3 and the third continuous wall 4 are existing technologies, and their construction methods are also existing technologies, so they will not be described in detail here.
[0016] A first interlayer 5 is formed between the first diaphragm wall 2 and the second diaphragm wall 3, and the soil within the first interlayer 5 is excavated. A second interlayer 6 is formed between the second diaphragm wall 3 and the third diaphragm wall 4, and the soil within the second interlayer 6 is excavated.
[0017] Anchor rods 8 are inserted downwards at the bottom of the first interlayer 5, extending upwards to the top of the first interlayer 5 and connecting with the process trench 1. A reinforcing cage (not shown in the figure) is also installed within the first interlayer 5. The anchor rods 8 pass through the center of the reinforcing cage and are fixed to the cage via connecting rods. Concrete reinforcing liquid 9 is filled into the first interlayer 5, and after the concrete reinforcing liquid 9 has cured, the first interlayer 5 is reinforced.
[0018] The second interlayer 6 contains a buffer reinforcement component 7, which includes multiple "bow"-shaped reinforcing rods. This arrangement allows the reinforcing rods to be elastic. Both ends of each reinforcing rod are fixed to one side of the third continuous wall 4. The multiple reinforcing rods are staggered and overlapped and fixed together. Finally, concrete is poured into the process tank 1 to form a reinforcing block.
[0019] In this embodiment, the pier reinforcement device consists of three continuous walls between the pre-excavated tunnel 400 and the railway pier 200. These three walls form two interlayers, in which the soil is completely excavated. One interlayer is reinforced with concrete to protect against the disturbance forces generated during tunnel excavation. Simultaneously, the other interlayer is supported by buffer reinforcement members 7. This effectively separates the pre-excavated tunnel 400 from the railway pier 200, ensuring that the disturbance forces generated during tunnel excavation only reach the first interlayer and then cease. Even if a small amount of disturbance force is transmitted to the second interlayer, the "bow"-shaped reinforcement rod can eliminate this disturbance force through deformation, ensuring that no disturbance forces are generated on the railway pier during tunnel excavation.
Claims
1. A pier reinforcement device for construction of a shield tunnel crossing a railway bridge, comprising a pre-excavated tunnel (400) within a geological layer (100) and a railway bridge pier (200) above the geological layer (100), wherein the foundation column (300) of the railway bridge pier (200) is disposed within the geological layer (100), characterized in that: A first continuous wall (2), a second continuous wall (3) and a third continuous wall (4) are set downward in the geological layer (100) between the railway bridge pier (200) and the pre-excavated tunnel (400). The first interlayer (5) between the first continuous wall (2) and the second continuous wall (3) is filled with concrete reinforcement liquid (9) for reinforcement. The second interlayer (6) between the second continuous wall (3) and the third continuous wall (4) is provided with buffer reinforcement components (7).
2. The bridge pier reinforcement device for shield tunnel side-crossing railway bridge construction according to claim 1, characterized in that: A process trench (1) is provided on the upper surface of the geological layer (100), and the first continuous wall (2), the second continuous wall (3) and the third continuous wall (4) are all located in the process trench (1).
3. The pier reinforcement device for shield tunnel side-crossing railway bridge construction according to claim 1, characterized in that: The buffer reinforcement component (7) includes multiple "bow" shaped reinforcement rods. Both ends of each reinforcement rod are fixed to one side of the third continuous wall (4). The multiple reinforcement rods are staggered and overlapped and fixed together with each other.
4. The pier reinforcement device for shield tunnel construction of a railway bridge crossing the side as described in claim 1, characterized in that: A steel cage is installed in the first mezzanine (5).
5. The pier reinforcement device for shield tunnel side-crossing railway bridge construction according to claim 4, characterized in that: An anchor rod (8) is inserted downward at the bottom of the first interlayer (5). The anchor rod (8) extends upward to the top of the first interlayer (5). The anchor rod (8) passes through the center of the steel cage and is fixed to the steel cage by a connecting rod.