Railway non-buried roadbed pile-slab structure of underpass highway bridge

Abstract

The utility model provides a railway non-buried subgrade pile-slab structure of underpass highway bridge, including: two rows of pile foundations, set up in the top of two rows of pile foundations, lay on the support beam on the bearing plate and set up in the ballastless track structure on the bearing plate, the two rows of pile foundations are correspondingly set up along railway subgrade and pass through highway bridge down, the ballastless track structure is set up in the ballastless track structure, the ballastless track structure is set up on the ballastless track structure, the ballastless track structure is set up on the ballastless track structure, the ballastless track structure is set up on the ballastless track structure. Wherein the pile foundations located below the highway bridge are arranged between the existing bridge piers; the two ends of each joist are arranged on the opposite pile foundations of the two rows of pile foundations; the bearing plate is used as the railroad bed and is arranged corresponding to the two rows of pile foundations; and each bearing plate is arranged corresponding to the ballastless track structure. 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 utility model relates to railway subgrade engineering technical field, especially in railway non -buried subgrade pile board structure of under -pass highway bridge. BACKGROUND

[0002] In the existing railway and highway intersection engineering, when railway needs to under -pass highway, usually adopts buried subgrade structure, deep foundation pit support structure or large -span bridge structure to realize. However buried subgrade structure, deep foundation pit support structure need large -scale excavation and backfill, construction period is long, and total settlement and post -construction settlement are large, and differential settlement is difficult to control, and the influence to surrounding environment especially existing highway bridge pile foundation is greater, it is unfavorable to the normal operation of highway bridge. Although large -span bridge structure reduces excavation, but bridge structure itself has certain height, and effective clearance from railway pavement to highway bridge bottom is easy to overrun, and railway bridge construction period is long, need more large -scale mechanical equipment in construction, and the construction cost is high, increases the complexity of design and construction, and is not conducive to highway bridge safety. SUMMARY

[0003] In view of above problem, the utility model aims at providing railway non -buried subgrade pile board structure of under -pass highway bridge to solve the problems such as effective clearance of existing subgrade structure is easy to be limited, construction period is long, and additional settlement deformation of additional load of filling subgrade to existing highway bridge pier.

[0004] The utility model provides a railway non -buried subgrade pile board structure of under -pass highway bridge, it includes: two rows of pile foundation, the joist of setting in two rows of pile foundation top, the load -bearing plate of laying on the joist to and the ballastless track structure of setting in the load -bearing plate, wherein,

[0005] Two rows of pile foundation are correspondingly arranged along the railway subgrade and under -pass highway bridge, wherein the pile foundation located below the highway bridge is arranged between the existing piers;

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

[0007] The load -bearing plate is correspondingly arranged with the two rows of pile foundations as the railway subgrade;

[0008] Each load -bearing plate is correspondingly arranged with the ballastless track structure, wherein a reinforcing sleeve is arranged in the interior of the ballastless track structure, and a pre -buried steel bar is arranged in the interior of the load -bearing plate, and the load -bearing plate is connected with the ballastless track structure through the pre -buried steel bar and the reinforcing sleeve.

[0009] Preferably, the pile foundation is a reinforced concrete cast-in-situ pile, wherein the reinforced concrete cast-in-situ pile is formed by low-clearance drilling equipment or manual hole digging.

[0010] Preferably, each row of pile foundations comprises edge piles at both ends of the railway subgrade, and middle piles between the edge piles.

[0011] Preferably, the joist is a reinforced concrete cast-in-place joist, the joist is rigidly connected with the pile foundation, and the main reinforcement of the pile body of the pile foundation is embedded in the joist.

[0012] Preferably, the joist comprises edge joists arranged on the edge piles and middle joists arranged on the middle piles.

[0013] Preferably, the load-bearing plate is a reinforced concrete cast-in-place plate, a reinforcing bar is arranged at the corner bevel of the load-bearing plate, and a crack-resistant steel mesh is arranged at the bottom of the end of the load-bearing plate.

[0014] Preferably, the edge joist overlaps the load-bearing plate; wherein,

[0015] A sliding layer is laid at the overlapping part of the edge joist and the load-bearing plate, and the sliding layer is a polyester filament composite polyethylene geomembrane.

[0016] Preferably, the edge joist and the load-bearing plate are connected by a sleeve pin, wherein,

[0017] The sleeve pin comprises a pre-embedded steel bar arranged inside the edge joist and a rectangular sleeve arranged inside the load-bearing plate.

[0018] Preferably, the middle pile is rigidly connected with the middle joist and the load-bearing plate, wherein the main reinforcement of the pile body of the middle pile is anchored into the load-bearing plate through the middle joist.

[0019] As can be seen from the above technical solutions, the railway non-buried subgrade pile plate structure of the utility model for passing under a highway bridge can bear the track and train load and transmit the load to the pile foundation through the joist, and then to the foundation, has simple structure, clear stress, can effectively improve the stability and bearing capacity of the railway subgrade, reduce the construction difficulty, shorten the construction period, has less influence on the surrounding environment during construction, has good environmental protection benefits, and is suitable for railway engineering construction under complex terrain conditions such as limited effective clearance for passing under a highway bridge.

[0020] To achieve the above and related objects, one or more aspects of the utility model include the features to be described in detail below. The following description and drawings describe certain exemplary aspects of the utility model. However, these aspects indicate only some of the various ways in which the principles of the utility model can be used. In addition, the utility model is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other objects and advantages of the present application can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a planar arrangement schematic diagram of a pile plate structure according to an embodiment of the present application;

[0023] Figure 2 is a longitudinal elevation schematic diagram of a pile plate structure according to an embodiment of the present application;

[0024] Figure 3 is a transverse cross-section schematic diagram of a pile plate structure according to an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of rigid connection of an edge pile and an edge joist according to an embodiment of the present application;

[0026] Figure 5 is a schematic diagram of rigid connection of a middle pile and a middle joist and a bearing plate according to an embodiment of the present application;

[0027] Figure 6 is a lap joint structure diagram of an edge joist and a bearing plate according to an embodiment of the present application.

[0028] The reference signs therein include:

[0029] 1, edge pile, 2, middle pile, 3, edge joist, 4, middle joist, 5, bearing plate, 51, first bearing plate, 52, second bearing plate, 6, existing bridge pier, 7, existing bridge pier foundation, 8, newly built railway track, 9, existing bridge boundary line, 10, pile foundation, 11, joist, 13, ballastless track structure, 14, sliding layer, 15, rectangular sleeve, 16, embedded steel bar.

[0030] The same reference signs in all the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0031] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It can be obvious, however, that such embodiment(s) can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0032] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0033] In view of the problems of the prior art roadbed structure that effective clearance is easily limited, construction period is long, and additional settlement deformation is caused by additional load of the filled roadbed on the existing highway bridge pier, the utility model provides a railway non-buried roadbed pile plate structure underpassing a highway bridge.

[0034] The specific embodiments of the utility model will be described in detail below in combination with the drawings.

[0035] In order to illustrate the structure of the railway non-buried roadbed pile plate structure underpassing a highway bridge provided by the utility model, Figures 1 to 6 The railway non-buried roadbed pile plate structure underpassing a highway bridge is exemplarily indicated from different angles. Specifically, Figure 1 The pile plate structure plane arrangement according to the embodiment of the utility model is shown; Figure 2 The pile plate structure longitudinal elevation according to the embodiment of the utility model is shown; Figure 3 The pile plate structure transverse section according to the embodiment of the utility model is shown; Figure 4 The rigid connection of the side pile and the side joist according to the embodiment of the utility model is shown; Figure 5 The rigid connection of the middle pile, the middle joist and the bearing plate according to the embodiment of the utility model is shown; Figure 6 The lap joint structure of the side joist and the bearing plate according to the embodiment of the utility model is shown.

[0036] As Figures 1 to 6As shown in the drawings, the utility model provides a railway non - buried subgrade pile plate structure of under -passing highway bridge, include: two rows of pile foundation 10, support beam 11 of setting in two rows of pile foundation 10's top, lay in bearing plate 5 on support beam 11, and set up ballastless track structure 13 on bearing plate 5, wherein, two rows of pile foundation 10 correspond to set along railway subgrade and under -pass through highway bridge, wherein, located the pile foundation 10 under the highway bridge is set between existing bridge pier 6, the both ends of each support beam 11 are set on the opposite pile foundation 10 of two rows of pile foundation, bearing plate 5 as railway subgrade, with two rows of pile foundation 10 correspond to set, each bearing plate 5 with ballastless track structure 13 correspond to set, wherein, in the inside of ballastless track structure 13 is provided with reinforcing sleeve, in the inside of each bearing plate 5 is provided with pre -buried reinforcing bar, bearing plate 5 with ballastless track structure 13 is connected with reinforcing sleeve through pre -buried reinforcing bar.

[0037] The utility model's railway non - buried subgrade pile plate structure is for the effective clearance limitation, needs to under -pass existing highway bridge with low fill subgrade, to reduce the additional load of fill subgrade to existing highway bridge pier, prevent additional settlement deformation of existing bridge pier due to additional load, the structure can realize railway under -pass highway without large -scale excavation, simultaneously has good bearing capacity, structural stability and lower construction and maintenance cost, guarantees highway, railway normal operation.

[0038] Among them, the pile plate structure is used for supporting newly built railway track 8, and the bearing plate 5 is directly connected with the ballastless track structure 13, the pile foundation 10, the support beam 11 and the bearing plate 5 are rigidly connected to form a bearing structure system with the subgrade rock-soil, which has high integrity and good stability.

[0039] Among them, the pile foundation 10 is a reinforced concrete cast-in-place pile, wherein, low-clearance drilling equipment is used to form the pile, or manual hole digging is used to form the pile when the groundwater depth is deep. The two rows of pile foundations 10 are longitudinally arranged under the existing highway bridge and on both sides of the existing highway bridge along the railway subgrade, and are transversely arranged between the existing bridge piers 6, and the existing bridge pier pile foundation 7 is arranged under the existing bridge piers 6, and the existing bridge pier pile foundation 7 is used for supporting the existing bridge piers 6, wherein, the pile foundation 10 located under the highway bridge is arranged between the existing bridge piers 6, that is, the pile foundation 10 located under the highway bridge does not exceed the existing bridge boundary line 9.

[0040] Among them, each row of pile foundations 10 includes edge piles 1 located at both ends of the railway subgrade and middle piles 2 located between the edge piles 1. Wherein, the reinforcement cage of each pile foundation is processed and hoisted in sections, and the height of the bridge clearance and the length of the cast-in-place pile are considered, and the reinforcement cage is connected at the hole opening; to prevent disturbing the highway bridge, the structure of the existing bridge piers 6 can be physically isolated and protected, such as using attached steel and rubber anti-collision columns.

[0041] The supporting beam 11 is a cast-in-place reinforced concrete supporting beam, rigidly connected to the pile foundation 10, with the main reinforcement bars of the pile foundation 10 embedded in the supporting beam 11. The supporting beam 11 includes a side supporting beam 3 mounted on the side pile 1 and a central supporting beam 4 mounted on the central pile 2. Figure 3 and Figure 4 In the embodiment shown, a cast-in-place concrete support beam is provided at the top of each row of pile foundations 10 in the transverse direction. The top of the pile foundation 10 is embedded in the support beam 11 by about 0.1m. The main reinforcement of the pile body extends into the support beam 11, and the top of the pile is rigidly connected to the support beam 11. The support beam 11 has a stirrup reinforcement zone within the main reinforcement of the pile body and within a range of one pile diameter on both sides.

[0042] Among them, the bearing plate 5 is a cast-in-place reinforced concrete slab, which is laid on the support beam 11 as the foundation of the railway track. The first bearing plate 51 is set along one row of foundation piles 10, and the second bearing plate 52 is set along another row of foundation piles 10. Reinforcing bars are set on the corners and sides of each bearing plate 5, and crack-resistant steel mesh is set at the bottom of the end of each bearing plate 5.

[0043] exist Figure 5 and Figure 6 In the illustrated embodiment, the side support beam 3 overlaps with the bearing plate 5; a sliding layer 14 is laid at the overlap between the side support beam 3 and the bearing plate 5, and the sliding layer 14 is made of polyester filament composite polyethylene geomembrane. The side support beam 3 and the bearing plate 5 are connected by sleeve pins, and the sleeve pins include pre-embedded steel bars 16 set inside the side support beam 3 and rectangular sleeves 15 set inside the bearing plate 5. To accommodate the longitudinal expansion and contraction deformation of the bearing plate 5, the long side of the rectangular sleeve 15 is set longitudinally along the line to ensure that the rectangular sleeve 15 can move along the line. The central pile 2 is rigidly connected to the central support beam 4 and the bearing plate 5, wherein the main reinforcement of the central pile 2 passes through the central support beam 4 and is anchored into the bearing plate 5.

[0044] In addition, the bearing plate 5 is connected to the ballastless track structure 13 by pre-embedded steel bars and reinforcing sleeves. Each bearing plate 5 corresponds to one ballastless track structure 13. A reinforcing sleeve is provided inside the ballastless track structure, and pre-embedded steel bars are provided inside each bearing plate. The bearing plate and the ballastless track structure are connected to the reinforcing sleeve by the pre-embedded steel bars.

[0045] In a specific embodiment of this utility model, the construction process of the railway non-buried roadbed pile slab structure under the highway bridge is as follows: S1: Fill or excavate to the preset elevation position of the bottom cushion layer of the bearing slab;

[0046] S2: Two rows of pile foundations are poured along the railway subgrade, wherein the two rows of pile foundations pass under the highway bridge, and the pile foundations located under the highway bridge are poured between the existing bridge piers;

[0047] S3: excavating the support beam foundation pit after the pile body concrete of the pile foundation reaches the preset strength;

[0048] S4: chiseling the top of the pile foundation so that the top of the pile foundation reaches the preset elevation position;

[0049] S5: pouring the support beam on the pile foundation;

[0050] S6: backfilling the support beam foundation pit and pouring the bearing plate on the support beam as the railway roadbed;

[0051] S7: layer-by-layer backfilling and compacting the subgrade soil on both sides of the bearing plate;

[0052] S8: fixing the ballastless track structure on the bearing plate after the construction of the support beam and the bearing plate is completed and reaches the preset time.

[0053] Before the step of filling or excavating to the bottom mat layer of the bearing plate to the preset elevation position, the method further comprises: treating the ground occupied by the pile foundation and setting a temporary drainage project.

[0054] In step S2, the pouring of two rows of pile foundations along the railway roadbed comprises: positioning each pile foundation and embedding a casing; drilling the casing and placing a steel reinforcement cage in the casing; pouring concrete into the casing to complete pouring of the pile foundation.

[0055] In step S5, the pouring of the support beam on the pile foundation comprises: pouring a support beam bottom mat layer on the pile foundation; binding steel reinforcement on the support beam bottom mat layer, overlapping and constructing dowels, and erecting a formwork; pouring concrete into the formwork to form the support beam.

[0056] In step S6, the pouring of the bearing plate on the support beam comprises: pouring a bearing plate mat layer on the support beam; binding steel reinforcement on the bearing plate mat layer, pre-embedding steel reinforcement and sleeves connected with the ballastless track structure, and erecting a formwork; pouring concrete into the formwork to form the bearing plate.

[0057] In more detail, the first step is to carry out surface treatment before pile foundation construction, set up temporary drainage works, and arrange the site. The second step is to fill or excavate to the bottom of the bearing plate bottom cushion to the design elevation, accurately position each pile, embed the protection cylinder, drill and check the hole, then lower the steel reinforcement cage, and pour concrete. The third step is to excavate the beam foundation pit after the pile concrete reaches the design strength and passes the detection, and to chisel off the pile head to the design elevation of the pile top. The fourth step is to pour the beam bottom cushion after the pile quality passes the detection, tie the reinforcement, construct the overlapping structure pin, erect the formwork, and pour the beam concrete. The fifth step is to backfill the beam foundation pit, pour the bearing plate cushion, tie the reinforcement, pre-embed the reinforcement connected with the track and the connecting sleeve, erect the formwork, and pour the bearing plate concrete. The sixth step is to backfill and compact the subgrade soil on both sides of the bearing plate in layers. The seventh step is to construct the top ballastless track structure after 28 days of completion of the construction of the beam and the bearing plate, and after the non-damage detection method passes the detection.

[0058] The above description is only optional embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields under the concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A railway non-buried subgrade pile-slab structure of a highway bridge underpass, characterized in that, The utility model relates to a kind of pile foundation structures of two rows, which include: two rows of pile foundations, joists arranged on top of the two rows of pile foundations, load-bearing plates laid on the joists, and ballastless track structures arranged on the load-bearing plates, wherein, The two rows of pile foundations are arranged correspondingly along the railway subgrade and pass through the highway bridge, wherein the pile foundations located below the highway bridge are arranged between existing piers. Two ends of each joist are arranged on opposite pile foundations of the two rows of pile foundations. The load-bearing plates are arranged correspondingly with the two rows of pile foundations as the railway subgrade. Each load-bearing plate is arranged correspondingly with the ballastless track structures, wherein a reinforcing sleeve is arranged inside the ballastless track structures, and embedded steel bars are arranged inside each load-bearing plate, and the load-bearing plates are connected with the ballastless track structures through the embedded steel bars and the reinforcing sleeve. The pile foundations are reinforced concrete bored piles, wherein the reinforced concrete bored piles are formed by low-clearance drilling equipment or manual hole digging.

2. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 1, characterized in that, Each row of pile foundations includes edge piles located at both ends of the railway subgrade and middle piles located between the edge piles.

3. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 2, characterized in that, The joists are reinforced concrete cast-in-place joists, and the joists are rigidly connected with the pile foundations, and the main reinforcement of the pile body of the pile foundations is embedded in the joists.

4. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 3, characterized in that, The joists include edge joists arranged on the edge piles and middle joists arranged on the middle piles.

5. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 4, characterized in that, The load-bearing plates are reinforced concrete cast-in-place plates, and reinforcing bars are arranged on the bevel edges of the load-bearing plates, and anti-cracking steel mesh is arranged at the bottom of the end of the load-bearing plates.

6. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 5, wherein The edge joists are overlapped with the load-bearing plates, wherein 7. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 6, characterized in that, A sliding layer is laid at the overlapping part of the edge joists and the load-bearing plates, and the sliding layer is made of polyester filament composite polyethylene geomembrane. The edge joists are connected with the load-bearing plates using sleeve dowel pins, wherein 8. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 7, characterized in that, The sleeve dowel pins include embedded steel bars arranged inside the edge joists and rectangular sleeves arranged inside the load-bearing plates. The middle piles are rigidly connected with the middle joists and the load-bearing plates, wherein the main reinforcement of the pile body of the middle piles passes through the middle joists and is anchored into the load-bearing plates.

9. The railway non-embanked pile-slab structure of the bridge underpassing a road according to claim 6, characterized by, ​

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