Railway non-buried roadbed pile-slab structure with underpass of highway bridge and construction method of railway non-buried roadbed pile-slab structure

Abstract

The invention provides a railway non-buried roadbed pile-slab structure underneath passing through a highway bridge and a construction method. The method comprises the following steps: filling or excavating to a preset elevation position of a bottom cushion layer of a bearing plate; two rows of pile foundations are poured along the railroad bed; when pile body concrete of the pile foundation reaches preset strength, a joist foundation pit is dug; the top of the pile foundation is chiseled away, so that the top of the pile foundation reaches a preset elevation position; a joist is poured on the pile foundation; the supporting beam foundation pit is backfilled, and a bearing plate is poured on the supporting beam to serve as the railroad bed; the foundation bed soil on the two sides of the bearing plate is backfilled and compacted layer by layer; and after the construction of the joist and the bearing plate is completed and the preset time is up, the ballastless track structure is fixed to the bearing plate. By means of the roadbed structure, the problems that effective clearance of an existing roadbed structure is prone to being limited, the construction period is long, and additional settlement deformation is generated due to the fact that a fill roadbed generates additional loads on existing highway bridge piers can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of railway roadbed engineering, and in particular to a non-buried railway roadbed pile plate structure passing under a highway bridge and a construction method thereof. Background Art

[0002] In existing railway and highway intersection projects, when the railway needs to pass under the highway, buried roadbed structure, deep foundation pit support structure or large-span bridge structure is usually used to achieve this. However, buried roadbed structure and deep foundation pit support structure require large-scale excavation and backfilling, with a long construction period, and the total settlement and post-construction settlement are large, and differential settlement is difficult to control, which has a great impact on the surrounding environment, especially the pile foundation of existing highway bridges, and is not conducive to the normal operation of highway bridges. Although the large-span bridge structure reduces excavation, the bridge structure itself has a certain height, and the effective clearance from the railway pavement to the bottom of the highway bridge is easy to exceed the limit. In addition, the construction period of the railway bridge is long, and a large number of large-scale mechanical equipment are required during construction, the construction cost is high, and the complexity of design and construction is increased, which is not conducive to the safety of highway bridges. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a non-buried roadbed pile-slab structure and construction method for a railway passing under a highway bridge, so as to solve the problems that the effective clearance of the existing roadbed structure is easily limited, the construction period is long, and the fill roadbed generates additional loads and additional settlement deformation on the piers of the existing highway bridge.

[0004] The present invention provides a non-buried railway roadbed pile-slab structure for passing under a highway bridge, comprising: two rows of pile foundations, joists arranged on top of the two rows of pile foundations, a bearing plate laid on the joists, and a ballastless track structure arranged on the bearing plate, wherein:

[0005] The two rows of pile foundations are arranged correspondingly along the railway roadbed and pass through the highway bridge, wherein the pile foundations located below the highway bridge are arranged between the existing bridge piers;

[0006] Both ends of each joist are arranged on opposite pile foundations of the two rows of pile foundations;

[0007] The bearing plate serves as the railway roadbed and is arranged corresponding to the two rows of pile foundations;

[0008] Each bearing plate is arranged corresponding to the ballastless track structure.

[0009] Preferably, each row of pile foundations includes side piles located at both ends of the railway roadbed and middle piles located between the side piles;

[0010] The joists include side joists arranged on the side piles and middle joists arranged on the middle piles.

[0011] Preferably, the joist is rigidly connected to the pile foundation, and main reinforcement of the pile body of the pile foundation is embedded in the joist.

[0012] Preferably, reinforcing ribs are provided at the angled edges of the bearing plate, and an anti-cracking steel mesh is provided at the bottom of the end of the bearing plate.

[0013] Preferably, the side joist is overlapped with the bearing plate, and the side joist is connected with the bearing plate by sleeve pins; wherein,

[0014] A sliding layer is laid at the overlap between the side joist and the bearing plate, and the sliding layer is made of polyester filament composite polyethylene geomembrane;

[0015] The sleeve pins include embedded steel bars arranged inside the side joists and rectangular sleeves arranged inside the bearing plate;

[0016] The center pile is rigidly connected to the center support beam and the bearing plate, wherein the main reinforcement of the center pile passes through the center support beam and is anchored in the bearing plate.

[0017] The present invention also provides a method for constructing a non-buried railway subgrade pile-slab structure under a highway bridge, and the non-buried railway subgrade pile-slab structure under a highway bridge is constructed. The construction method comprises:

[0018] Fill or cut to the preset elevation position of the bottom cushion of the bearing plate;

[0019] Casting two rows of pile foundations along the railway roadbed, wherein the two rows of pile foundations pass under a highway bridge, and the pile foundations located below the highway bridge are cast between the highway bridge piers;

[0020] When the pile body concrete of the pile foundation reaches a preset strength, digging a joist foundation pit;

[0021] Chiseling away the top of the pile foundation so that the top of the pile foundation reaches a preset elevation position;

[0022] casting joists on the pile foundation;

[0023] Backfilling the joist foundation pit, and pouring the bearing plate on the joist as the railway roadbed;

[0024] Backfilling and compacting the bed soil on both sides of the bearing plate in layers;

[0025] When the construction of the supporting beam and the bearing plate is completed and the preset time is reached, the ballastless track structure is fixed on the bearing plate.

[0026] Preferably, before the step of filling or excavating to preset the elevation position of the bottom cushion layer of the bearing plate, the method further includes: treating the ground occupied by the pile foundation and setting up a temporary drainage project.

[0027] Preferably, the pouring of two rows of pile foundations along the railway roadbed comprises: positioning each pile foundation and burying casing;

[0028] Drilling holes in the casing and placing a steel cage into the casing;

[0029] Concrete is poured into the casing to complete the pouring of the pile foundation.

[0030] Preferably, the step of casting the joist on the pile foundation comprises:

[0031] pouring the joist bottom cushion on the foundation piles;

[0032] Tie the steel bars to the bottom pad of the joist, overlap the structural pins, and build the formwork;

[0033] Concrete is poured into the formwork to form the joists.

[0034] Preferably, the step of casting the bearing plate on the joist comprises:

[0035] pouring a bearing plate cushion layer on the joist;

[0036] Tie the steel bars to the supporting plate cushion layer, embed the steel bars and sleeves connected to the ballastless track structure, and build a template;

[0037] Concrete is poured into the formwork to form the bearing plate.

[0038] It can be seen from the above technical scheme that the present invention provides a non-buried railway roadbed pile-plate structure and construction method for an underpass highway bridge. The load-bearing plate bears the track and train loads and transmits them to the pile foundation through the support beam, and then transmits them to the foundation. The structure is simple and the force is clear. It can effectively improve the stability and bearing capacity of the railway roadbed, reduce the construction difficulty, shorten the construction period, and the construction has little impact on the surrounding environment. It has good environmental benefits and is suitable for railway engineering construction under complex terrain conditions such as limited effective clearance under a highway bridge.

[0039] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0041] Figure 1 is a schematic diagram of the planar layout of a pile-plate structure according to an embodiment of the present invention;

[0042] Figure 2 is a schematic diagram of a longitudinal elevation of a pile-plate structure according to an embodiment of the present invention;

[0043] Figure 3 is a schematic cross-sectional view of a pile-plate structure according to an embodiment of the present invention;

[0044] Figure 4 Schematic diagram of the rigid connection between the edge pile and the edge joist according to an embodiment of the present invention;

[0045] Figure 5 It is a schematic diagram of the rigid connection between the center pile, the center support beam and the bearing plate according to an embodiment of the present invention;

[0046] Figure 6 A structural diagram of the overlap between the side joist and the bearing plate according to an embodiment of the present invention;

[0047] Figure 7 The present invention is a schematic flow chart of a method for constructing a non-buried roadbed pile-slab structure for a railway passing under a highway bridge according to an embodiment of the present invention.

[0048] Reference numerals include:

[0049] 1. Side piles, 2. Middle piles, 3. Side joists, 4. Middle joists, 5. Bearing plates, 51. First bearing plates, 52. Second bearing plates, 6. Existing bridge piers, 7. Existing bridge pier pile foundations, 8. New railway tracks, 9. Existing bridge boundary lines, 10. Pile foundations, 11. Joists, 13. Ballastless track structure, 14. Sliding layer, 15. Rectangular casing, 16. Embedded steel bars.

[0050] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0051] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0052] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In response to the aforementioned problems that the effective clearance of the existing roadbed structure is easily limited, the construction period is long, and the fill roadbed generates additional loads and additional settlement deformation on the piers of the existing highway bridge, the present invention provides a non-buried roadbed pile-slab structure and construction method for a railway passing under a highway bridge.

[0054] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0055] In order to illustrate the structure of the non-buried railway roadbed pile-slab structure under the highway bridge provided by the present invention, Figures 1 to 6 The non-buried roadbed pile-slab structure of the railway under the highway bridge is illustrated from different angles. Specifically, Figure 1 The plan layout of the pile-plate structure according to an embodiment of the present invention is shown; Figure 2 It shows a longitudinal elevation of a pile-plate structure according to an embodiment of the present invention; Figure 3 shows a transverse section of a pile-plate structure according to an embodiment of the present invention; Figure 4 It shows the rigid connection between the edge pile and the edge joist according to an embodiment of the present invention; Figure 5 It shows the rigid connection between the center pile, the center joist and the bearing plate according to an embodiment of the present invention; Figure 6 The overlapping structure of the edge joist and the bearing plate according to an embodiment of the present invention is shown.

[0056] like Figures 1 to 6 As shown together, the non-buried railway roadbed pile-plate structure passing under a highway bridge provided by the present invention comprises: two rows of pile foundations 10, support beams 11 arranged on the tops of the two rows of pile foundations 10, a bearing plate 5 laid on the support beams 11, and a ballastless track structure 13 arranged on the bearing plate 5, wherein the two rows of pile foundations 10 are arranged correspondingly along the railway roadbed and pass under the highway bridge, wherein the pile foundations 10 located below the highway bridge are arranged between the existing bridge piers 6; both ends of each support beam 11 are arranged on the pile foundations 10 opposite to the two rows of pile foundations; the bearing plate 5 serves as the railway roadbed and is arranged corresponding to the two rows of pile foundations 10; and each bearing plate 5 is arranged corresponding to the ballastless track structure 13.

[0057] The railway non-buried roadbed pile-slab structure of the present invention is designed to reduce the additional load generated by the fill roadbed on the piers of the existing highway bridge when the effective clearance is limited and a low fill roadbed needs to be used to pass under the existing highway bridge. This structure can realize the railway passing under the highway without large-scale excavation, and at the same time has good bearing capacity, structural stability and low construction and maintenance costs, ensuring the normal operation of the highway and railway.

[0058] Among them, the pile-plate structure is used to support the newly built railway track 8, and the bearing plate 5 is directly connected to the ballastless track structure 13. The pile foundation 10, the supporting beam 11, the bearing plate 5 are rigidly connected with the roadbed rock and soil to form a bearing structure system with strong integrity and good stability.

[0059] The pile foundation 10 is a reinforced concrete bored pile, wherein low-headroom drilling equipment is used to form the piles, or when the groundwater is buried deep, manual excavation can also be used to form the piles. Two rows of pile foundations 10 are arranged longitudinally along the railway roadbed below and on both sides of the existing highway bridge, and transversely between the existing bridge piers 6. Existing bridge pier pile foundations 7 are arranged below the existing bridge piers 6, and the existing bridge pier pile foundations 7 are used to support the existing bridge piers 6, wherein the pile foundations 10 below the highway bridge are arranged between the existing bridge piers 6, that is, the pile foundations 10 below the highway bridge do not exceed the boundary line 9 of the existing bridge.

[0060] Each row of pile foundations 10 includes side piles 1 at both ends of the railway roadbed and middle piles 2 between the side piles 1. The steel cage processing and the length of the hoisting sections of each pile foundation focus on the clearance height under the bridge and the length of the cast-in-place piles, and the connection is hoisted at the hole mouth; in order to prevent disturbance of the highway bridge, the structure of the existing bridge pier 6 can be physically isolated and protected, such as using attached steel and rubber anti-collision columns.

[0061] The joist 11 is a reinforced concrete cast-in-place joist, which is rigidly connected to the pile foundation 10, and the main reinforcement of the pile body of the pile foundation 10 is embedded in the joist 11. The joist 11 includes a side joist 3 arranged on the side pile 1 and a middle joist 4 arranged on the middle pile 2. Figure 3 and Figure 4 In the embodiment shown, a cast-in-place concrete joist is provided on the top of each horizontal row of pile foundations 10, the pile top of the pile foundation 10 is embedded in the joist 11 by about 0.1m, the main reinforcement of the pile body extends into the joist 11, and the pile top is rigidly connected to the joist 11; the joist 11 is provided with a stirrup reinforcement densification area inside the main reinforcement of the pile body and within a range of one times the pile diameter on both sides.

[0062] Among them, the bearing plate 5 is a cast-in-place reinforced concrete plate, which is laid on the supporting beam 11 and serves as the foundation of the railway track. The first bearing plate 51 is arranged along one row of foundation piles 10, and the second bearing plate 52 is arranged along another row of foundation piles 10. Reinforcing ribs are arranged on the corner bevels of each bearing plate 5, and an anti-cracking steel mesh is arranged at the end bottom of each bearing plate 5.

[0063] exist Figure 5 and Figure 6 In the embodiment shown, the side joist 3 overlaps the bearing plate 5; a sliding layer 14 is laid at the overlap between the side joist 1 and the bearing plate 5, and the sliding layer 14 is made of polyester filament composite polyethylene geomembrane. The side joist 3 is connected to the bearing plate 5 by sleeve pins, and the sleeve pins include embedded steel bars 16 arranged inside the side joist 3 and rectangular sleeves 15 arranged inside the bearing plate 5. In order to adapt to the longitudinal expansion and contraction deformation of the bearing plate 5, the long side of the rectangular sleeve 15 is arranged longitudinally along the line to ensure that the rectangular sleeve 15 can move along the line. The middle pile 2 is rigidly connected to the middle joist 4 and the bearing plate 5, wherein the main reinforcement of the pile body of the middle pile 2 passes through the middle joist 4 and is anchored into the bearing plate 5.

[0064] In addition, the bearing plate 5 is connected to the ballastless track structure 13 through embedded steel bars and reinforcing sleeves, and each bearing plate 5 corresponds to a ballastless track structure 13, wherein a reinforcing sleeve is arranged inside the ballastless track structure, and embedded steel bars are arranged inside each bearing plate, and the bearing plate and the ballastless track structure are connected through the embedded steel bars and the reinforcing sleeves.

[0065] Corresponding to the above structure, the present invention also provides a construction method for a non-buried roadbed pile-slab structure of a railway passing under a highway bridge. Figure 7 The flowchart of the construction method of the non-buried roadbed pile-slab structure of a railway passing under a highway bridge according to an embodiment of the present invention is shown.

[0066] like Figure 7 As shown, the present invention also provides a construction method for a non-buried railway subgrade pile-slab structure under a highway bridge, and the non-buried railway subgrade pile-slab structure under a highway bridge is constructed. The construction method comprises:

[0067] S1: Fill or cut to the preset elevation position of the bottom cushion of the bearing plate;

[0068] S2: Casting two rows of pile foundations along the railway roadbed, wherein the two rows of pile foundations pass under a highway bridge, and the pile foundations located below the highway bridge are cast between the highway bridge piers;

[0069] S3: when the pile body concrete of the pile foundation reaches a preset strength, digging a joist foundation pit;

[0070] S4: Chiseling off the top of the pile foundation so that the top of the pile foundation reaches a preset elevation position;

[0071] S5: pouring the joist on the pile foundation;

[0072] S6: backfilling the joist foundation pit, and pouring a bearing plate on the joist as the railway roadbed;

[0073] S7: backfilling and compacting the bed soil on both sides of the bearing plate in layers;

[0074] S8: When the construction of the supporting beam and the bearing plate is completed and reaches a preset time, the ballastless track structure is fixed on the bearing plate.

[0075] Wherein, before the step of filling or excavating to preset the elevation position of the bottom cushion layer of the bearing plate, it also includes: processing the ground occupied by the pile foundation and setting up a temporary drainage project.

[0076] In step S2, the pouring of two rows of pile foundations along the railway roadbed includes: positioning each pile foundation and burying a casing; drilling holes in the casing and placing a steel cage into the casing; pouring concrete into the casing, thereby completing the pouring of the pile foundation.

[0077] In step S5, the pouring of the joist on the pile foundation includes: pouring the joist bottom cushion on the pile foundation; tying steel bars on the joist bottom cushion, overlapping structural pins, and building a formwork; pouring concrete into the formwork to form the joist.

[0078] In step S6, the step of casting the bearing plate on the joist includes: casting a bearing plate cushion layer on the joist; tying steel bars to the bearing plate cushion layer, pre-embedding steel bars and sleeves connected to the ballastless track structure, and building a formwork; and pouring concrete into the formwork to form the bearing plate.

[0079] In a specific embodiment of the present invention, the first step is to perform surface treatment before pile foundation construction, set up temporary drainage projects, and tidy up the site. The second step is to fill or excavate to the design elevation of the bottom cushion layer of the bearing plate, accurately position each pile, bury the casing, drill holes, inspect the holes, and then lower the steel cage and pour concrete. The third step is to excavate the joist foundation pit after the pile body concrete reaches the design strength and passes the inspection. The pile head is chiseled to the design elevation of the pile top. The fourth step is to pour the joist bottom cushion layer, tie the steel bars, construct the lap joint structural pins, and set up the formwork to pour the joist concrete. The fifth step is to backfill the joist foundation pit, pour the bearing plate cushion layer, tie the steel bars, pre-embed the steel bars and connecting sleeves connected to the track, and set up the formwork to pour the bearing plate concrete. The sixth step is to backfill and compact the bed soil on both sides of the bearing plate in layers. The seventh step is to construct the top ballastless track structure 28 days after the construction of the joist and the bearing plate is completed and passed the inspection using the non-destructive detection method.

[0080] The specific structure of the device in the method of the present invention refers to the aforementioned embodiments. Since the present method adopts all the technical solutions of all the aforementioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the aforementioned embodiments, which will not be described one by one here.

[0081] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A non-buried roadbed pile-slab structure for a railway passing under a highway bridge, characterized in that: include: Two rows of pile foundations, joists arranged on top of the two rows of pile foundations, a bearing plate laid on the joists, and a ballastless track structure arranged on the bearing plate, wherein: The two rows of pile foundations are arranged correspondingly along the railway roadbed and pass through the highway bridge, wherein the pile foundations located below the highway bridge are arranged between the existing bridge piers; Both ends of each joist are arranged on opposite pile foundations of the two rows of pile foundations; The bearing plate serves as the railway roadbed and is arranged corresponding to the two rows of pile foundations; Each bearing plate is arranged corresponding to the ballastless track structure.

2. The non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 1 is characterized in that: Each row of pile foundations includes side piles located at both ends of the railway roadbed and a middle pile located between the side piles; The supporting beams include side supporting beams arranged on the side piles and middle supporting beams arranged on the middle piles.

3. The non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 2 is characterized in that: The support beam is rigidly connected to the pile foundation, and main reinforcement of the pile body of the pile foundation is embedded in the support beam.

4. The non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 3 is characterized in that: Reinforcement ribs are arranged at the angle bevels of the bearing plate, and an anti-cracking steel mesh is arranged at the bottom of the end of the bearing plate.

5. The non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 4 is characterized in that: The side joist is overlapped with the bearing plate, and the side joist is connected with the bearing plate by sleeve pins; wherein, A sliding layer is laid at the overlap between the side joist and the bearing plate, and the sliding layer is made of polyester filament composite polyethylene geomembrane; The sleeve pins include embedded steel bars arranged inside the side joists and rectangular sleeves arranged inside the bearing plate; The center pile is rigidly connected to the center support beam and the bearing plate, wherein the main reinforcement of the center pile passes through the center support beam and is anchored in the bearing plate.

6. A construction method for a non-buried roadbed pile-slab structure of a railway passing under a highway bridge, characterized in that: The non-buried railway subgrade pile-slab structure under a highway bridge as described in claims 1 to 5 is constructed, and the construction method comprises: Fill or cut to the preset elevation position of the bottom cushion of the bearing plate; Cast two rows of pile foundations along the railway roadbed, wherein the two rows of pile foundations pass through a highway bridge, and the pile foundations located below the highway bridge are cast between the existing bridge piers; When the pile body concrete of the pile foundation reaches a preset strength, digging a joist foundation pit; Chiseling away the top of the pile foundation so that the top of the pile foundation reaches a preset elevation position; casting joists on the pile foundation; Backfilling the joist foundation pit, and pouring the bearing plate on the joist as the railway roadbed; Backfilling and compacting the bed soil on both sides of the bearing plate in layers; When the construction of the supporting beam and the bearing plate is completed and the preset time is reached, the ballastless track structure is fixed on the bearing plate.

7. The construction method of the non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 6 is characterized in that: Before the step of filling or excavating to preset the elevation position of the bottom cushion layer of the bearing plate, the method also includes: processing the ground occupied by the pile foundation and setting up a temporary drainage project.

8. The construction method of the non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 6, characterized in that: The pouring of two rows of pile foundations along the railway roadbed includes: positioning each pile foundation and burying casing; Drilling holes in the casing and placing a steel cage into the casing; Concrete is poured into the casing to complete the pouring of the pile foundation.

9. The construction method of the non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 6, characterized in that: The step of pouring the joist on the pile foundation comprises: pouring the joist bottom cushion on the foundation piles; Tie the steel bars to the bottom pad of the joist, overlap the structural pins, and build the formwork; Concrete is poured into the formwork to form the joists.

10. The construction method of the non-buried roadbed pile-slab structure of a railway under a highway bridge according to claim 6, characterized in that: The step of pouring the bearing plate on the joist comprises: pouring a bearing plate cushion layer on the joist; Tie the steel bars to the supporting plate cushion layer, embed the steel bars and sleeves connected to the ballastless track structure, and build a template; Concrete is poured into the formwork to form the bearing plate.

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