A remedial device for a jibbed overhead jacking frame bridge

Abstract

The application relates to a technical field of a frame underpass railway passage, in particular to a remediation device after cutting of an overhead jacking frame bridge. The remediation device comprises a sliding plate, the sliding plate is a reinforced concrete structure, the top surface of the sliding plate is inclined, and the inclination angle of the sliding plate is adapted to the deviation correction amount after cutting of the frame bridge; a plurality of steel rail piles are arranged, the bottom of the steel rail pile penetrates a soft soil layer and is located in a bearing layer, and the top of the steel rail pile is located in the sliding plate; an equalizing plate is arranged at the top of each steel rail pile; and an equalizing reinforcing bar group is arranged above the equalizing plate and is connected with reinforcing bars in the sliding plate. The remediation device solves the repair problem after cutting of the overhead jacking frame bridge, has the advantages of good reinforcing effect, high leveling precision, strong long-term stability and the like, is particularly suitable for similar problem disposal in railway / highway bridge engineering, and has remarkable engineering application value.

Description

Technical Field

[0001] This application relates to the field of railway underpass technology, and in particular to a remedial device for a frame bridge after the bridge has been cut off. Background Technology

[0002] Elevated jacking frame bridges are a common construction method for urban underground pipelines, railway or highway underpasses. The specific operation involves prefabricating a reinforced concrete frame bridge body in a working pit, and then using jacking equipment to push the bridge body from the pit into the designed position. During construction, it is crucial to strictly control the deviation between the bridge body's jacking axis and the design axis, typically through frequent measurement and correction. However, in actual construction, due to factors such as uneven soil conditions, uneven jacking force distribution, differences in jack synchronization, or operational errors, a "head-cutting" phenomenon often occurs. This means that the front end of the bridge body partially exceeds the design axis, leading to discontinuities in the frame bridge's alignment, localized stress concentration at the front end, and even the risk of collision with existing structures (such as roadbeds or tracks).

[0003] Traditional solutions typically involve simple bridge body modification or localized foundation hardening. However, these methods often fail to fundamentally address the ongoing deformation caused by foundation soil disturbance, severely impacting construction quality and progress.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a remedial device for the cutting off of an overhead jacking frame, so as to solve or alleviate the problems existing in the prior art.

[0006] To achieve the above objectives, this application provides the following technical solution: A remedial device for a jacking-in frame bridge after its end is cut off, the remedial device comprising: The sliding plate is a reinforced concrete structure, and the top surface of the sliding plate is inclined. The inclination angle of the sliding plate is adapted to the amount of correction after the frame bridge is cut off. The rail piles are provided in multiples, with the bottom of the rail piles penetrating the weak soil layer and located in the bearing layer, and the top of the rail piles located in the sliding plate. An equalizing plate is installed on the top of each rail pile; The equalizing reinforcement group is arranged above the equalizing plate and is connected to the reinforcement in the slide plate.

[0007] As described above, in the remedial device after the end of the overhead jacking frame bridge is cut off, preferably, multiple prestressing tendons are evenly distributed in the sliding plate along the width direction. The prestressing tendons extend along the extension direction of the sliding plate, and in the width direction of the sliding plate, the prestressing tendons and the equalizing plate are arranged alternately.

[0008] In the remedial device for the overhead jacking frame bridge after the head is cut as described above, preferably, the sliding plate is provided with a double layer of steel mesh, and the prestressing tendons are arranged between the double layer of steel mesh.

[0009] In the remedial device for the cut-off section of the overhead jacking frame bridge as described above, preferably, the cross-sectional dimensions of the equal-pressure steel reinforcement group gradually decrease from top to bottom.

[0010] As described above, in the remedial device after the cut-off of the overhead jacking frame bridge, preferably, the equal-pressure steel bar group includes ring bars and axial bars, with the transverse bars of multiple ring bars gradually decreasing in size from top to bottom, and the axial bars used to connect multiple ring bars in series. The topmost ring bar is connected to the upper layer of the double-layer steel mesh, and the bottommost ring bar is in contact with the equalizing plate.

[0011] As described above, in the remedial device after the end of the overhead jacking frame bridge is cut off, preferably, the bottom of the sliding plate is also provided with multiple anchor beams, which extend along the width direction of the sliding plate, and the anchor beams and rail piles are arranged alternately in the width direction of the sliding plate.

[0012] In the remedial device for the overhead jacking frame bridge after the head is cut as described above, preferably, the steel bars in the anchor beam are connected to the double-layer steel mesh in the sliding plate, so that the anchor beam and the sliding plate form an integral reinforced concrete structure.

[0013] In the remedial device for the overhead jacking frame bridge after the head is cut off as described above, preferably, a sand and gravel cushion layer is provided between the sliding plate and the foundation.

[0014] Compared with the closest prior art, the technical solution of this application has the following beneficial effects: This remedial device solves the repair problem after the top of an overhead jacking frame bridge is cut off by using a combination of rail pile foundation reinforcement, sand-crushed stone cushion layer transition, anchor beam restraint, sliding plate leveling, and setting uniform components and prestressed tendons. It has advantages such as good reinforcement effect, high leveling accuracy, and strong long-term stability. It is applicable to the handling of similar problems in railway / highway bridge engineering and has significant engineering application value. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1An extended cross-sectional view of a remedial device provided according to some embodiments of this application; Figure 2 A width-direction cross-sectional view of a remedial device provided according to some embodiments of this application.

[0016] Explanation of reference numerals in the attached figures: 1. Rail piles; 2. Anchor beams; 3. Slide plates; 4. Double-layer steel mesh; 5. Sand and gravel cushion layer; 6. Equalizing plate; 7. Ring reinforcement; 8. Axial reinforcement; 9. Prestressed tendons. Detailed Implementation

[0017] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0018] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0020] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," 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 do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] The present application will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0022] According to specific embodiments of this application, such as Figure 1-2 As shown, this application provides a remedial device for a jacking-in frame bridge after the bridge has been cut off. The remedial device includes: Slide 3 is a reinforced concrete structure with a tilted top surface. The tilt angle of slide 3 is adapted to the amount of correction after the frame bridge is cut off.

[0023] Rail pile 1, multiple rail piles 1 are provided, the bottom of rail pile 1 penetrates the weak soil layer and is located in the bearing layer, and the top of rail pile 1 is located in the sliding plate 3.

[0024] A pressure equalizing plate 6 is installed on the top of each rail pile 1.

[0025] The equalizing reinforcement group is set above the equalizing plate and is connected to the reinforcement in the slide plate 3.

[0026] In this remedial device, a sliding plate 3 with a certain tilt angle is set, and the tilt angle of the sliding plate 3 is adapted to the degree of the cut end of the frame bridge and the amount of correction that needs to be repaired. When the frame bridge continues to advance along the sliding plate 3, the sliding plate 3 with the tilt angle can correct the cut end of the frame bridge, so that the frame bridge can return to its normal posture. Thus, while ensuring better construction quality, it can also greatly improve construction efficiency.

[0027] By setting rail posts 1 on the bottom plate of the slide plate 3, inserting the bottom of the rail posts 1 into the hard bearing layer, and placing the top of the rail posts 1 in the slide plate 3, the rail posts 1 provide sufficient support force for the slide plate 3 to prevent the frame bridge from being cut off again.

[0028] A pressure equalization plate 6 is installed on the top of the rail pile 1, and pressure equalization steel bars are installed on the pressure equalization plate 6. This allows the rail pile 1 to be connected to the sliding plate 3 through the pressure equalization assembly. This ensures that the sliding plate 3 can transmit the force it receives to the rail pile 1 more evenly through the pressure equalization assembly, thereby avoiding stress concentration at the connection between the rail pile 1 and the sliding plate 3, which could easily lead to damage. In other words, it ensures that the rail pile 1 and the sliding plate 3 have sufficient connection strength and can evenly transmit a large force.

[0029] Multiple prestressing tendons 9 are evenly distributed along the width direction in the slide plate 3. The prestressing tendons 9 extend along the extension direction of the slide plate 3, and the prestressing tendons 9 and the equalizing plate 6 are arranged alternately in the width direction of the slide plate 3.

[0030] In this embodiment, the prestressed tendons 9 are provided in the slide plate 3, which can greatly increase the load-bearing capacity of the slide plate 3, so that the slide plate 3 can better support the heavy frame bridge.

[0031] The slide plate 3 is provided with a double-layer steel mesh 4, and the prestressed tendons 9 are arranged between the double-layer steel mesh 4.

[0032] In this embodiment, a double-layer steel mesh 4 is used as the skeleton of the slide plate 3, and prestressed tendons 9 are set between the double-layer steel mesh 4, so that the slide plate 3 has extremely high structural strength, which can prevent the frame bridge from being cut off again, so as to ensure that the remedial device has better durability and stability during use.

[0033] The cross-sectional dimensions of the uniformly stressed reinforcing bars gradually decrease from top to bottom.

[0034] In this embodiment, the cross-sectional area of ​​the equalizing reinforcement group gradually decreases from top to bottom, that is, the area of ​​the uppermost part of the equalizing reinforcement group is the largest, and the area of ​​the lowermost part is the smallest. This arrangement allows the uppermost part of the equalizing reinforcement group to have a larger contact area with the slide plate 3, while the lowermost part of the equalizing reinforcement group contacts the equalizing plate 6. This enables the equalizing assembly composed of the equalizing reinforcement group and the equalizing plate 6 to uniformly transmit the force between the slide plate 3 and the rail, thereby avoiding stress concentration between the slide plate 3 and the rail, and thus avoiding the easy occurrence of local damage to the slide plate 3. This ensures that the overall remedial device has good structural strength.

[0035] The equalizing reinforcement group includes ring bars 7 and axial bars 8. The transverse bars of multiple ring bars 7 gradually decrease in size from top to bottom. The axial bars 8 are used to connect multiple ring bars 7 in series. The uppermost ring bar 7 is connected to the upper layer of the double-layer steel mesh 4, and the lowermost ring bar 7 is in contact with the equalizing plate 6.

[0036] In this embodiment, the ring reinforcement 7 can be circular or square, and the cross-sectional size of the ring reinforcement 7 is larger at the uppermost layer. The ring reinforcement 7 and the upper layer of the double-layer steel mesh 4, and the ring reinforcement 7 and the axial reinforcement 8 can be connected by binding or welding. The bottommost ring reinforcement 7 and the pressure equalizing plate 6 can be fixedly connected by welding, and the pressure equalizing plate 6 and the rail pile 1 are fixedly connected to each other by welding.

[0037] The bottom of the slide plate 3 is also provided with multiple anchor beams 2. The anchor beams 2 extend along the width direction of the slide plate 3. In the width direction of the slide plate 3, the anchor beams 2 and the rail piles 1 are arranged alternately.

[0038] In this embodiment, an anchor beam 2 is provided at the bottom of the slide plate 3, which not only increases the contact area between the slide plate 3 and the foundation, but also increases the structural strength of the slide plate 3 itself, so that the slide plate 3 has better structural stability and load-bearing capacity.

[0039] The steel bars in the anchor beam 2 are connected to the double-layer steel mesh 4 in the slide plate 3, so that the anchor beam 2 and the slide plate 3 form an integral reinforced concrete structure.

[0040] In this embodiment, the steel bars in the anchor beam 2 and the double-layer steel mesh 4 in the slide plate 3 can be connected to each other by binding or welding, and the anchor beam 2 and the slide plate 3 are poured with concrete at the same time to form an integral reinforced concrete structure.

[0041] A sand and gravel cushion layer 5 is provided between the slide plate 3 and the foundation. In this embodiment, the sand and gravel cushion layer 5 is used to ensure that the bottom foundation of the slide plate 3 is in a dry and hard state.

[0042] The remedial device also includes the following steps when in use: Step 1: Head Tilting Monitoring and Data Analysis After the frame structure experienced a head-down phenomenon, high-precision total stations and levels were used for on-site measurements to accurately determine its actual linear state after the head-down, including changes in longitudinal slope and elevation. These measuring tools precisely determined the specific linear parameters of the frame bridge structure after the head-down, providing scientific data support for subsequent correction work. During the measurement process, several key data indicators were focused on, including the head-down amount, the rear-end rise, and the maximum offset position. The head-down amount refers to the extent of settlement at the front end of the frame structure, while the rear-end rise refers to the degree of relative rise at the rear end; these two parameters directly reflect the severity of the head-down. The maximum offset position refers to the point of maximum displacement that occurred during the head-down process; this location is of significant guiding importance for subsequent correction work. By accurately measuring these data, a comprehensive understanding of the actual situation of the frame structure after the head-down can be obtained, providing a scientific basis for subsequent correction work.

[0043] Step 2: Lay a sand-and-gravel bedding layer A 20-centimeter-thick layer of sand and gravel should be laid between the foundation and the reinforced concrete sliding plate. Before laying, the silt and debris on the foundation base must be thoroughly removed. Then, the sand and gravel layer should be laid in layers, with each layer not exceeding 10 centimeters in thickness, and compacted using a small tamping machine to ensure a compaction coefficient ≥0.95, so as to ensure that the layer is uniform and dense.

[0044] Step 3: Construction of Rail Pile Foundation Reinforcement Within the range extending along the frame bridge, 2.5-meter-long steel rails are laid out, with a north-south spacing of 6 meters and an east-west spacing of 2 meters. During construction, vibratory hammers or static pressure methods are used to drive the rails vertically into the foundation, ensuring that the top of the rail pile faces the frame side and that the exposed 30-centimeter portion is embedded in the sliding plate. An equipotential plate is welded to the top of the rail, and equipotential reinforcement bars are tied to the equipotential plate.

[0045] In this embodiment, using scrap steel rails as construction materials for rail piles reduces costs compared to traditional methods, resulting in significant indirect economic benefits.

[0046] Step 4: Construct the anchor beam structure Anchor beams are to be installed horizontally within the direction of travel of the frame bridge. These anchor beams are made of reinforced concrete, spaced 3.5 meters apart, 0.5 meters deep, and 0.5 meters wide. Their length is determined based on the width of the frame. After the anchor beam excavation is completed, the silt and debris inside must be removed, followed by the binding of the anchor beam reinforcement.

[0047] Step 5: Construction of reinforced concrete sliding plate structure Within the forward direction of the frame bridge, a layer of reinforced concrete sliding plate is constructed on the subbase. The sliding plate internally uses a double-layer steel mesh, connected to the anchor beam reinforcement and equipotential reinforcement to ensure a unified steel-concrete structure. Multiple prestressing tendons are then arranged between the double-layer steel mesh and tensioned. The anchor beam and sliding plate are then integrally cast using high-grade concrete to shorten the frame bridge's jacking construction time. During the concrete finishing stage, the slope of the sliding plate surface is precisely set based on monitored frame bridge abutment data, ensuring a specific tilt angle on the sliding plate surface.

[0048] Step 6: Frame Bridge Monitoring After the frame bridge was installed and initially secured, comprehensive data on its linear position and elevation were collected. High-precision total stations and levels were used during the measurement process to ensure the accuracy and reliability of the data. In the early stages of construction, the project team developed a rigorous monitoring plan, requiring surveyors to regularly remeasure the linear position and elevation of the frame bridge daily, and to conduct detailed comparative analysis of the latest data with the initial data. This continuous monitoring approach allowed for the timely detection of any minor displacements or settlement changes in the frame bridge, ensuring that its linear position and elevation remained stable throughout the construction process, providing a reliable foundation for subsequent construction procedures.

[0049] This remedial device has the following advantages: 1. Significant reinforcement effect: Multiple reinforcement measures work together to form a complete stress system. Practice has proven that the bearing capacity of the foundation is increased by more than 50%, the lateral displacement of the soil is reduced by 60%-80%, and the foundation deformation is effectively controlled.

[0050] 2. Good economic efficiency: Using scrap steel rails as the main reinforcement material reduces costs compared to traditional methods. At the same time, the construction period is shortened, resulting in significant indirect economic benefits.

[0051] 3. Wide adaptability: Applicable to various geological conditions, especially effective in adverse geological conditions such as soft soil and silt. The pile length, spacing, and layout can be adjusted according to different geological conditions.

[0052] 4. Safe and reliable: Multiple safeguards and real-time monitoring and early warning effectively prevent secondary accidents. The monitoring system can promptly detect anomalies and take preventative measures.

[0053] 5. Environmentally friendly and energy-saving: Make full use of waste materials, reduce concrete usage, and lower carbon emissions. This aligns with the concepts of green construction and sustainable development.

[0054] 6. Excellent quality control: Real-time monitoring and precise adjustments ensure the quality of the process. The final bridge structure position accuracy can be controlled within ±5mm for horizontal deviation and ±3mm for vertical deviation.

[0055] 7. High overall benefits: It not only solves the problem of cutting the head, but also improves the overall stability of the foundation, providing good working conditions for subsequent jacking, resulting in significant overall benefits.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A remedial device for a jacking-in frame bridge after its end has been cut, characterized in that, The remedial device includes: The sliding plate is a reinforced concrete structure, and the top surface of the sliding plate is inclined. The inclination angle of the sliding plate is adapted to the amount of correction after the frame bridge is cut off. The rail piles are provided in multiples, with the bottom of the rail piles penetrating the weak soil layer and located in the bearing layer, and the top of the rail piles located in the sliding plate. An equalizing plate is installed on the top of each rail pile; The equalizing reinforcement group is arranged above the equalizing plate and is connected to the reinforcement in the slide plate.

2. The remedial device for a jacked-up frame bridge after head cutting according to claim 1, characterized in that, The slide plate has multiple prestressed tendons evenly distributed along its width direction. The prestressed tendons extend along the extension direction of the slide plate, and the prestressed tendons and the equalizing plate are arranged alternately in the width direction of the slide plate.

3. The remedial device for the cut-off end of an overhead jacking frame bridge according to claim 2, characterized in that, The slide plate is provided with a double layer of steel mesh, and the prestressed tendons are arranged between the double layer of steel mesh.

4. The remedial device for the cut-off end of an overhead jacking frame bridge according to claim 3, characterized in that, The cross-sectional dimensions of the uniformly stressed reinforcing bars gradually decrease from top to bottom.

5. The remedial device for the cut-off end of an overhead jacking frame bridge according to claim 4, characterized in that, The equalizing reinforcement group includes ring bars and axial bars. The size of the transverse bars of multiple ring bars gradually decreases from top to bottom, and the axial bars are used to connect multiple ring bars in series. The topmost ring bar is connected to the upper layer of the double-layer steel mesh, and the bottommost ring bar is in contact with the equalizing plate.

6. The remedial device for a jacking-in frame bridge after head cutting according to claim 5, characterized in that, The bottom of the slide is also provided with multiple anchor beams, which extend along the width of the slide. In the width direction of the slide, the anchor beams and the rail piles are arranged alternately.

7. The remedial device for a jacking-in frame bridge after head cutting according to claim 6, characterized in that, The steel bars in the anchor beam are connected to the double-layer steel mesh in the slide plate, making the anchor beam and the slide plate form an integral reinforced concrete structure.

8. The remedial device for a jacking frame bridge after head cutting according to any one of claims 1-7, characterized in that, A sand and gravel cushion layer is provided between the sliding plate and the foundation.

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