CN117626721A - Ballastless track system for isolating foundation deformation - Google Patents
Ballastless track system for isolating foundation deformation Download PDFInfo
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- CN117626721A CN117626721A CN202410094666.1A CN202410094666A CN117626721A CN 117626721 A CN117626721 A CN 117626721A CN 202410094666 A CN202410094666 A CN 202410094666A CN 117626721 A CN117626721 A CN 117626721A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 239000011800 void material Substances 0.000 claims abstract description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 26
- 239000004744 fabric Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 12
- 238000010276 construction Methods 0.000 description 15
- 239000002689 soil Substances 0.000 description 15
- 238000013461 design Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
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- 239000004567 concrete Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
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- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
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- 238000003466 welding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 230000000750 progressive effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention relates to the technical field of railway engineering, and discloses a ballastless track system for isolating foundation deformation, which comprises the following components: pile foundations are a plurality of pile foundations which are deeply buried in the foundation at intervals, and the top of each pile foundation is exposed out of the foundation; the number of the bearing platforms is multiple, and the bottom ends of the bearing platforms are respectively fixed with the top ends of the pile foundations; the plurality of pedestals are arranged, and the bottom ends of the pedestals are respectively fixed with the top ends of the plurality of bearing platforms; the plurality of track beams are arranged, two ends of each track beam are respectively supported on two adjacent pedestals, and a void gap is formed between the bottom end of each track beam and the top end of the foundation; the steel rail is fixed on the top end face of the track beam through a fastener. The track beam of the track system is separated from the lower foundation in a void way, so that the steel rail is not influenced by the foundation when the foundation is deformed, the smoothness of the steel rail track is maintained, the stability of a railway line is improved, the maintenance workload is reduced, and the maintenance cost is reduced. And, the track system maintains stability and adaptability even in areas where geological conditions are complex or unstable.
Description
Technical Field
The invention relates to the technical field of railway engineering, in particular to a ballastless track system for isolating foundation deformation.
Background
Ballastless tracks are widely applied to modern railway systems such as urban rail transit, high-speed railways and the like due to the advantages of high smoothness, high stability and low maintenance cost. Ballastless track structures directly secure ties or track slabs to a strong concrete foundation, thereby theoretically providing a more stable track system. However, even such seemingly advanced systems are not fully immune to the effects of underlying deformations.
In practice, one of the main challenges faced by the existing ballastless track system is how to cope with the problem of track smoothness caused by deformation of the lower foundation, and in fact, the smooth improvement of the ballastless track of the high-speed railway in China is basically caused by the deformation of the lower foundation. Common lower foundation deformations include subgrade settlement, frost heaving and arching at the tunnel bottom. Subgrade settlement may be caused by insufficient soil stability, groundwater movement, or artifacts, among other reasons. Frost heaving is an inherent phenomenon in cold areas, and water in soil expands in volume during freezing, so that roadbed structures deform. The arching at the bottom of the tunnel is mainly caused by groundwater flow and pressure changes. The traditional ballastless track structure and the lower foundation are continuously contacted, and when the lower foundation is unevenly deformed due to continuous contact, besides the track is unsmooth, discontinuous contact phenomenon can occur between the bottom of the ballastless track and the foundation, dynamic void is generated, and the running quality of a train is affected.
Furthermore, ride control of ballastless track systems generally requires complex maintenance work. In the face of uneven deformation of the roadbed, most of the existing solutions require large-scale adjustment or reconstruction of the track system, which is not only costly, but also affects the normal operation of the train. In particular, during the service life of the rail, the foundation may have continuous sedimentation or deformation of the arch, which requires continuous maintenance, invests a lot of maintenance costs, and interferes with operation.
In the prior art, the publication number is CN 215800693U, the name is a separated roadbed ballastless track transition section pile plate structure, a transition section roadbed processing technology is provided, the transition section settlement deformation often exists due to the performance of filling materials and large bridge head impact at the position of the road bridge transition section, the phenomenon of high-speed 'jump car' is caused, the influence of the settlement deformation of a roadbed body on the track structure can be reduced by applying the technology, but the technology can only be aimed at a special area of the road bridge transition section, belongs to a roadbed professional special technology, is only suitable for the condition of settlement, is not suitable for roadbed sections with expansive soil and the like and tunnel sections, and therefore, the technology has no universal applicability. Therefore, starting from the track system, a novel ballastless track system capable of isolating foundation deformation needs to be developed so as to adapt to the foundation non-uniform deformation existing in different area environments of a common section.
Thus, existing ballastless track systems, while improved over conventional tracks in terms of stability and maintenance costs, are still limited in sensitivity to lower foundation deformations. Therefore, developing a ballastless track system capable of effectively isolating the influence of deformation of a lower foundation becomes an important subject in railway construction and maintenance. The design of the novel ballastless track system needs to solve the defects of the existing system, improve the adaptability to foundation deformation, reduce the maintenance requirements caused by the adaptability to the foundation deformation, and ensure long-term track smoothness and railway operation safety.
Disclosure of Invention
In view of the above, the invention provides a ballastless track system for isolating deformation of a foundation, which is used for improving the adaptability of the existing railway ballastless track, and particularly aims at the smoothness problem caused by deformation of a lower foundation (such as roadbed settlement, frost heaving, tunnel bottom arching and the like). The core of the system is that the system can structurally separate the ballastless track structure from the lower foundation, so that the direct influence of foundation deformation on the track is reduced.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a ballastless track system for isolating foundation deformations, comprising:
pile foundations are a plurality of pile foundations which are deeply buried in the foundation at intervals, and the top of each pile foundation is exposed out of the foundation;
the number of the bearing platforms is multiple, and the bottom ends of the bearing platforms are respectively fixed with the top ends of the pile foundations;
the plurality of pedestals are arranged, and the bottom ends of the pedestals are respectively fixed with the top ends of the plurality of bearing platforms;
the plurality of track beams are arranged, two ends of each track beam are respectively supported on two adjacent pedestals, and a void gap is formed between the bottom end of each track beam and the top end of the foundation;
the steel rail is fixed on the top end face of the track beam through a fastener.
Compared with the prior art, the ballastless track system for isolating foundation deformation is provided, and the track system can enable the track beam and the lower foundation to be separated from each other through pile foundations, bearing platforms and pedestals, so that the steel rail is not affected by the foundation when the foundation is deformed, and smoothness of the steel rail track is maintained. And, the track system maintains stability and adaptability even in areas where geological conditions are complex or unstable. In addition, the track beam only adopts the contact of the two ends of the track beam and the pedestal, and the simple support beam structure application of the track beam ensures that the stress system of the track structure is more definite, and the designability of the beam body, reinforcing bars and the like is greatly improved when the stress is applied.
Therefore, the invention effectively solves the stability and smoothness problems of the existing ballastless track system when the lower foundation is deformed by the innovative design, and provides a more reliable and economical solution for the railway track system. The system is not only suitable for newly built railway projects, but also suitable for reconstruction of the existing railway lines, especially in areas with complex geological conditions or frequently facing foundation deformation problems. Compared with the prior art, the ballastless track system can effectively reduce the influence of lower foundation deformation on the track, improve the stability of a railway line, reduce maintenance workload and reduce maintenance cost.
Furthermore, the bearing platform and the top of the pile foundation are integrally cast and fixed.
The beneficial effects of adopting above-mentioned technical scheme to produce are: the bearing platform and the pile foundation are poured into a whole, so that the structural stability of the track system can be improved, and the load of the track system can be stably transmitted to the pile foundation.
Further, an elastic backing plate is arranged at the contact position of the bottom end face of the track beam and the pedestal.
The beneficial effects of adopting above-mentioned technical scheme to produce are: an elastic base plate is arranged above the pedestal and used for absorbing vibration and pressure generated by train operation, so that the stability of the track beam is maintained, and meanwhile, certain vertical height adjusting capability can be provided by arranging the elastic base plates with different thicknesses.
Further, end limiting base plates are arranged at the contact positions of the two end faces of the track beam and the pedestal.
Further, lateral limit base plates are arranged at the contact positions of the two opposite side surfaces of the track beam and the pedestal.
The beneficial effects of adopting above-mentioned technical scheme to produce are: the end limiting base plate and the side limiting base plate can limit the front-back and left-right lateral movement of the track beam, prevent the track beam from horizontally shifting, and ensure the use safety of the track system.
Further, the pile foundation is wrapped with a geotechnical cloth layer for separating the pile foundation from the foundation.
The beneficial effects of adopting above-mentioned technical scheme to produce are: the influence of local deformation of the foundation on deformation and stress of the pile body can be reduced, and the stable support of the pile foundation is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a vertical section structure of an isolated foundation deformation ballastless track system provided by the invention when the system is applied to a roadbed.
Fig. 2 is an enlarged schematic view of the structure of the part a in fig. 1.
Fig. 3 is a schematic cross-sectional structure diagram of the ballastless track system with deformed isolation foundation when the ballastless track system is applied to a roadbed.
Fig. 4 is an enlarged schematic view of the structure of the part B in fig. 3.
Fig. 5 is a schematic vertical section structure of the ballastless track system with deformed isolation foundation when the ballastless track system is applied to a tunnel.
Fig. 6 is a schematic cross-sectional structure diagram of the ballastless track system with isolated foundation deformation applied to a tunnel.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a ballastless track system for isolating foundation deformation, which comprises the following components:
pile foundations 1, wherein the pile foundations 1 are deeply buried in the foundation 100 at intervals, and the top of each pile foundation 1 is exposed out of the foundation 100;
the number of the bearing platforms 2 is multiple, and the bottom ends of the bearing platforms 2 are respectively fixed with the top ends of the pile foundations 1;
the plurality of pedestals 3, the bottom ends of the pedestals 3 are respectively fixed with the top ends of the plurality of bearing platforms 2;
the plurality of track beams 4 are arranged, two ends of each track beam 4 are respectively supported on two adjacent pedestals 3, and a void gap 5 is arranged between the bottom end of each track beam 4 and the top end of the foundation 100;
the steel rail 6, the steel rail 6 is fixed on the top end face of the track beam 4 through the fastener 7.
The bearing platform 2 and the top of the pile foundation 1 are integrally cast and fixed.
An elastic backing plate 8 is arranged at the contact position of the bottom end surface of the track beam 4 and the pedestal 3.
The contact position of the two end surfaces of the track beam 4 and the pedestal 3 is provided with an end limiting pad 9.
The contact position of the two opposite sides of the track beam 4 and the pedestal 3 is provided with a lateral limit pad plate 10.
The pile foundation 1 is wrapped with a geotechnical cloth layer for separating the pile foundation 1 from the foundation 100.
Specific example 1:
as shown in fig. 1-4, this embodiment describes a ballastless track system employing an isolated foundation variant of the present invention in a specific engineering environment. The engineering environment is a section of roadbed 100, a soft soil layer 101 exists in a shallow layer of the roadbed 100, the soft soil layer 101 has continuous sedimentation deformation after a railway line is opened due to high water content, loose soil quality and the like, and the deformation can be estimated to be more than 200 mm. Under such geological conditions, the existing ballastless track system mainly depends on fasteners for deformation adjustment, and the adjustment capacity is less than 30mm, so that the smoothness requirement of normal operation cannot be met.
And (3) preparation of construction:
before construction, a detailed geological survey is first performed to evaluate the depth, distribution and sedimentation rate of the soft soil layer 101. According to the survey results, the depth and diameter of pile foundation 1 are designed to ensure that it can penetrate soft soil layer 101 to reach underlying stable soil layer 102.
Pile foundation construction:
pile foundation 1 is constructed in stabilized soil layer 102 below soft soil layer 101 as desired by design using appropriate pile foundation 1 construction equipment, such as a static pile machine or a rotary drilling rig. The material of the pile foundation may be cast-in-place concrete pile, precast concrete pile or steel pile, the specific choice depending on the design load and construction conditions.
Bearing platform and pedestal construction:
and a bearing platform 2 is poured at the top of the pile foundation 1, an integrated structure is formed with the pile foundation 1, a member for connecting the pedestal 3 is reserved at the top of the bearing platform 2, and the reserved member can be in the modes of embedded bars, reserved bolt holes, reserved grooves and the like. And after the concrete of the bearing platform 2 reaches the design strength, installing the pedestal 3, and stably connecting with the bearing platform 2 by means of cast-in-situ, bolts or welding and the like.
Track beam arrangement:
the elastic cushion 8 and the horizontal limit cushion (comprising the end limit cushion 9 and the lateral limit cushion 10) are placed on the pedestal 3, the thickness of the elastic cushion 8 is designed to be allowed to be adjusted within a certain range so as to adapt to the adjustment of the construction elevation deviation and the track smoothness of the operation period of the pedestal 3, the track beam 4 is installed, and the size of the track beam 4 is determined according to the design load. The rail beam 4 is contacted with the pedestal 3 at two ends, and a proper void gap 5 is arranged between the middle part and the lower part foundation so as to adapt to the vertical dynamic deformation of the beam body in the midspan and simultaneously facilitate the installation of the rail beam.
Rail and fastener installation:
fasteners 7 are installed on the rail beam 4, and then the rails 6 are placed and secured with the fasteners 7.
And (3) adjusting and checking:
after the steel rail 6 is installed, the track system is finely adjusted, so that the line shape of the steel rail is ensured to meet the design requirement. And verifying whether the stability and smoothness of the track system meet the operation requirements or not through load test and actual operation simulation.
The specific description is as follows:
in this embodiment, the deformation amount of the soft soil layer can be expected to be up to 200mm, which is far more than the deformation adjustment capability of the existing ballastless track, so that the track system adopting the invention is particularly suitable. By setting up the pile foundation in the stabilized soil layer below the soft soil layer and designing the bearing platform and the pedestal to be integrated with the pile foundation, the supporting state and smoothness of the track system can be ensured not to be affected even under the condition of continuous settlement of the soft soil layer. The system provided by the invention can adapt to basic deformation up to 200mm, and is far beyond the range which can be adapted by the prior art, thereby ensuring the safety and continuity of train operation.
Specific example 2:
as shown in fig. 5-6, this embodiment describes a ballastless track system that employs an isolated foundation variant of the present invention in tunnels where large deformations exist. Inside the tunnel, the change in water pressure outside the tunnel lining 200 may cause the tunnel bottom to be deformed upwards by 100mm or more due to the presence of the crevice water. The deformation has serious influence on track smoothness, and the existing ballastless track system cannot adapt to the large deformation due to design limitation, so that the design requirement of operation cannot be met.
And (3) preparation of construction:
after the tunnel lining 200 is constructed, a detailed inspection is first performed to determine the location of the crevice water region. This may include geological radar detection, sonic detection, or other suitable detection techniques. The depth of the bedrock is detected and determined by drilling a hole in a predetermined fractured water zone. This step is critical because the design of the pile foundation is closely related to the bedrock depth.
Drilling and pile foundation construction:
drilling holes into the bedrock 103 at predetermined locations of the tunnel lining 200, followed by pouring cast-in-place reinforced concrete piles ensures that each pile foundation 1 penetrates deep into the bedrock 103 to provide stable support. Geotextile is arranged between the pile body and surrounding rock and lining of the tunnel for isolation so as to reduce the influence of local deformation of the surrounding rock and lining in the range of the pile body on deformation and stress of the pile body.
Bearing platform and pedestal construction:
and a bearing platform 2 is poured at the top of the pile foundation 1, an integrated structure is formed with the pile foundation 1, a member for connecting a pedestal is reserved at the top of the bearing platform 2, and the reserved member can be embedded bars, reserved bolt holes, reserved grooves and the like. After the concrete of the bearing platform reaches the design strength, the pedestal 3 is installed and is stably connected with the bearing platform 2 by means of cast-in-situ, bolts or welding and the like.
Inverted arch backfill layer construction:
after the construction of the pedestal 3 is completed, a tunnel inverted arch backfill layer 104 is poured, the tunnel bottom is processed into a flat surface, and a certain height is reserved between the tunnel bottom surface and the designed lower surface of the track beam.
Track beam arrangement:
the elastic cushion 8 and the horizontal limit cushion (comprising the end limit cushion 9 and the lateral limit cushion 10) are placed on the pedestal 3, the thickness of the elastic cushion 8 is designed to be allowed to be adjusted within a certain range so as to adapt to the adjustment of the construction elevation deviation and the track smoothness of the operation period of the pedestal 3, the track beam 4 is installed, and the size of the track beam 4 is determined according to the design load. The track beam 4 is contacted with the pedestal 3 at two ends, and a proper void gap 5 is arranged between the middle part and the tunnel bottom so as to adapt to the vertical dynamic deformation of the beam body in the midspan and facilitate the installation of the track beam.
Rail and fastener installation:
fasteners 7 are installed on the rail beam 4, and then the rails 6 are placed and secured with the fasteners 7.
And (3) adjusting and checking:
after the steel rail 6 is installed, the track system is finely adjusted, so that the line shape of the steel rail is ensured to meet the design requirement. And verifying whether the stability and smoothness of the track system meet the operation requirements or not through load test and actual operation simulation.
The ballastless track system can remarkably improve the stability and smoothness of the railway ballastless track under complex geological conditions, greatly improve the adaptability of the ballastless track to the deformation of the lower foundation, and reduce the maintenance cost. In addition, the system is designed in consideration of convenience and economy of site construction, and can be widely applied to upgrading and reconstruction of newly built railways or existing railways.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A ballastless track system for isolating foundation deformations, comprising:
pile foundations (1), wherein the pile foundations (1) are deeply buried in the foundation (100) at intervals, and the top of each pile foundation (1) is exposed out of the foundation (100);
the plurality of bearing platforms (2) are arranged, and the bottom ends of the bearing platforms (2) are respectively fixed with the top ends of the pile foundations (1);
the plurality of pedestals (3) are arranged, and the bottom ends of the pedestals (3) are respectively fixed with the top ends of the plurality of bearing platforms (2);
the plurality of track beams (4) are arranged, two ends of each track beam (4) are respectively supported on two adjacent pedestals (3), and a void gap (5) is formed between the bottom end of each track beam (4) and the top end of the foundation (100);
the steel rail (6) is fixed on the top end face of the track beam (4) through a fastener (7).
2. Ballastless track system for isolating foundation deformations according to claim 1, characterized in that the bearing platform (2) is fixed with the pile foundation (1) top by integrally cast.
3. A ballastless track system for isolating foundation deformations according to claim 1 or 2, characterized in that the contact position of the bottom end surface of the track beam (4) with the pedestal (3) is provided with an elastic pad (8).
4. Ballastless track system isolating foundation deformations according to claim 1 or 2, characterized in that the contact position of the two end faces of the track beam (4) with the bench (3) is provided with end limit pads (9).
5. A ballastless track system for isolating foundation deformations according to claim 1 or 2, characterized in that the contact position of the opposite sides of the track beam (4) with the pedestal (3) is provided with lateral limit pads (10).
6. A ballastless track system for isolating foundation deformation according to claim 1 or 2, characterized in that the pile foundation (1) is covered with a geotechnical cloth layer for isolating the pile foundation (1) from the foundation (100).
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| CN111636257A (en) * | 2020-06-30 | 2020-09-08 | 中铁四院集团西南勘察设计有限公司 | Turnout foundation structure of straddle type single-rail low-mounted line and construction method thereof |
| CN215758263U (en) * | 2021-07-20 | 2022-02-08 | 中铁三局集团桥隧工程有限公司 | Reinforcing system for ultra-large section tunnel to penetrate existing railway downwards |
| CN215800693U (en) * | 2021-08-23 | 2022-02-11 | 中铁二院贵阳勘察设计研究院有限责任公司 | Disconnect-type road bed ballastless track changeover portion pile slab structure |
| CN114717882A (en) * | 2022-05-25 | 2022-07-08 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Full-assembled ballastless track capable of preventing train derailing and overturning |
| CN117345283A (en) * | 2023-09-22 | 2024-01-05 | 盐城工学院 | Method for repairing deformation and uplift of surrounding rock of sedimentary rock tunnel substrate and reconstruction structure |
| CN117090598A (en) * | 2023-10-08 | 2023-11-21 | 广西北投交通养护科技集团有限公司 | Foundation treatment method of tunnel mini pile embedded joist combined structure in operation period |
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