Track lower foundation deformation simulation test platform

Abstract

The invention belongs to the technical field of railway track engineering test equipment, and discloses a track lower foundation deformation simulation test platform which comprises a supporting seat, a platform frame, a vertical jack, a platform frame transverse adjusting lead screw, an isolation steel plate, a concrete seat, a track structure and a track transverse adjusting lead screw. The platform overcomes the defect that a traditional test platform cannot simulate a large-scale foundation deformation mode, and accurate simulation of deformation such as upward arching, sinking and transverse deviation of a lower foundation of a full-scale track structure is achieved by establishing the platform. Necessary test conditions and important technical guarantee are provided for mastering the influence of foundation deformation on ballastless track surface smoothness and track mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of railway track engineering test equipment, and more particularly to a track lower foundation deformation simulation test platform. Background Art

[0002] Ballastless track, with its advantages of excellent stability and minimal maintenance, has become the preferred track structure for my country's high-speed railways and long tunnels. Preventing and controlling foundation deformation is a key factor in ballastless track construction. Ballastless track requires high track smoothness and has limited inherent adjustment capabilities. When foundation deformation exceeds the adjustment limits of the fasteners, it directly affects track surface irregularities. Excessive differential deformation can also damage the ballastless track structure and pose safety risks to trains.

[0003] The coordinated deformation mechanism and response characteristics of ballastless track and substructure have always been a research hotspot in the field of track engineering. However, existing research has mainly focused on simulation calculations and theoretical analysis, and lacks simulation test equipment and technology for full-scale model tests of foundation deformation. Model test methods are of great significance in the relevant research on ballastless track foundation deformation, and a reliable test platform is a necessary condition for conducting relevant tests. Existing ballastless track test platforms are mainly based on static and dynamic loading tests of track structures, and have great limitations in experimental research on complex deformation modes of simulation foundations, mechanical characteristics of long-section ballastless track systems, and mechanisms of disease generation. It is necessary to develop a ballastless track substructure deformation simulation test platform to achieve accurate simulation of different substructure deformation modes of large-scale track structures.

[0004] The ballastless track is an ultra-long strip structure distributed longitudinally along the line space. It has a large structural deadweight and is long in size. In order to accurately assess the impact of the deformation of the lower foundation on it, a full-scale test platform needs to establish test units of tens of meters, which places extremely high demands on the loading mechanism and synchronous control of deformation simulation. On the other hand, the deformation pattern of the lower foundation of the ballastless track is complex, which poses a huge challenge to the deformation adjustment mechanism, load-bearing system and node design of the test platform.

[0005] Therefore, how to provide a track lower foundation deformation simulation test platform that can overcome the shortcomings of traditional test platforms that cannot simulate large-scale foundation deformation modes, and realize accurate simulation of deformations such as arching, sinking, and lateral offset of the lower foundation of the full-scale track structure, and provide necessary test conditions and important technical guarantees for understanding the influence of foundation deformation on the smoothness of the ballastless track track surface and the mechanical properties of the track is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0006] In light of this, the present invention provides a track substructure deformation simulation test platform that overcomes the inability of traditional test platforms to simulate large-scale foundation deformation patterns. This platform enables accurate simulation of deformations such as arching, subsidence, and lateral offset of the substructure of a full-scale track structure. This provides the necessary testing conditions and important technical support for understanding the impact of foundation deformation on the smoothness of ballastless track surface and the mechanical properties of the track.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A track substructure deformation simulation test platform, comprising:

[0009] A support base, wherein the support base has a receiving groove;

[0010] The platform frames are arranged in a plurality of rows, and the two platform frames located at the left and right ends are respectively hingedly connected to the left and right groove walls of the accommodating groove. The two adjacent platform frames are hingedly connected via a first hinge seat, and push-pull steel beams are fixed to the two adjacent platform frames.

[0011] A plurality of vertical jacks are installed on the bottom surface of the receiving tank, and the telescopic ends of the vertical jacks are connected to push-pull frames, which can push or pull down the push-pull steel beams, thereby achieving the adjustment of the partial arching or sinking of the platform frame;

[0012] The platform frame transverse adjustment screw rods are hingedly mounted on the front and rear side walls of the accommodating groove, and the telescopic ends of the platform frame transverse adjustment screw rods are hingedly connected to platform push plates for pushing the platform frame to move transversely;

[0013] Isolation steel plates, wherein the isolation steel plates are laid side by side on the platform frames, the isolation steel plates are connected to the platform frames by bolts, a plurality of connecting pins are evenly distributed and fixed on the top surface of the isolation steel plates, a concrete seat is cast on the top surface of the isolation steel plates, a plurality of connecting pins are pre-embedded in the concrete seat, and a track structure is fixed on the concrete seat;

[0014] A plurality of track transverse adjustment screw rods are hingedly mounted on the front and rear side walls of the accommodating groove, and the telescopic ends of the track transverse adjustment screw rods are hingedly connected to track push plates for pushing the track structure to move transversely;

[0015] Among them, the bolts between the isolation steel plate and the platform frame and the connecting pins between the isolation steel plate and the concrete seat can simulate interlayer tension to achieve the settlement condition of the rigid foundation with interlayer connection.

[0016] Through the above technical solutions, it can be seen that compared with the prior art, the present invention discloses a track lower foundation deformation simulation test platform. In addition to the vertical deformation simulation, the test platform is equipped with a platform frame lateral adjustment screw and a track lateral adjustment screw, so that the test platform has the ability to simulate the lateral deformation of the lower foundation in the horizontal direction. That is, the present invention can achieve the simulation of the foundation deformation mechanical state of more complex working conditions in actual engineering through the independent or combined action of the vertical jack, the platform frame lateral adjustment screw, and the track lateral adjustment screw, which significantly improves the authenticity and engineering applicability of the simulation test. Moreover, the number of platform frames can be determined according to the test requirements, and in particular, an experimental platform capable of simulating large-scale foundation deformation can be equipped, overcoming the deficiency of traditional test platforms that cannot simulate large-scale foundation deformation modes. In addition, the platform frame and the track structure can simulate interlayer tension by arranging connectors such as bolts and connecting pins to achieve accurate simulation of the track structure on rigid foundations such as tunnels and bridges.

[0017] Furthermore, the push-pull frame includes:

[0018] A push plate, the bottom end of which is connected to the telescopic end of the vertical jack;

[0019] A support column, the lower end of which is fixedly connected to the top end of the push plate;

[0020] A pull-down plate, the bottom end of which is fixedly connected to the upper end of the support column;

[0021] Among them, the push-pull steel beam is located between the top push plate and the pull-down plate, so that the top push plate pushes the push-pull steel beam, or the pull-down plate pulls down the push-pull steel beam, thereby realizing the local arching or sinking adjustment of the platform frame.

[0022] Furthermore, it also includes a plurality of vertical locking screws installed on the bottom surface of the accommodating groove, and the telescopic ends of the vertical locking screws are hingedly connected to the bottom end of the pushing plate, which are used to lock the platform position when needed to prevent the hydraulic system from leaking and causing the platform position to change.

[0023] Furthermore, a joint cover plate is laid between two adjacent isolation steel plates.

[0024] Furthermore, the platform frame transverse adjustment screw rod and the track transverse adjustment screw rod are both connected to the groove wall of the accommodating groove through a second hinge seat.

[0025] Furthermore, the platform frame located at the leftmost end is connected to the groove wall of the accommodating groove through a third hinge seat.

[0026] Furthermore, it also includes a transverse adjustment screw rod, which is connected to the groove wall of the accommodating groove through a fourth hinge seat, and the telescopic end of the transverse adjustment screw rod is hingedly connected to the platform frame located at the rightmost end.

[0027] Furthermore, a high-precision displacement sensor is provided on the vertical jack to measure the lifting and sinking heights of the vertical jack in real time during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the main structure of a track lower foundation deformation simulation test platform provided by the present invention.

[0030] Figure 2 This is a schematic diagram of the top structure of a track lower foundation deformation simulation test platform provided by the present invention.

[0031] Figure 3 This is a side structural schematic diagram of a track lower foundation deformation simulation test platform provided by the present invention.

[0032] Figure 4 This is a schematic diagram of the upward structure of a track lower foundation deformation simulation test platform provided by the present invention with the support seat removed.

[0033] Figure 5 This is a schematic diagram of the lower axle side structure of a track lower foundation deformation simulation test platform provided by the present invention, with the support seat removed.

[0034] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the middle part.

[0035] Figure 7 This is a schematic diagram of the upper axial side structure of a track lower foundation deformation simulation test platform provided by the present invention, with the support seat removed. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0039] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] Given the diverse deformation modes of track substructures, including vertical arching / settlement, lateral horizontal offset, and the coupled effects of deformation in different directions, each of these deformation modes has distinct impacts on the track structure. Therefore, the present invention provides a test platform for simulating substructure deformation, overcoming the limitations of traditional test platforms in simulating large-scale foundation deformation modes. Furthermore, this platform enables accurate simulation of full-scale track substructure deformations, such as arching, subsidence, and lateral offset. This provides the necessary experimental conditions and important technical support for understanding the impact of foundation deformation on the smoothness and mechanical properties of ballastless track surfaces.

[0041] See Figure 1-Figure 7 As shown, an embodiment of the present invention discloses a track lower foundation deformation simulation test platform, comprising:

[0042] The support base 1 has a receiving groove 101;

[0043] The platform frames 2 are arranged in a plurality, and the two platform frames 2 at the left and right ends are respectively hingedly connected to the left and right groove walls of the accommodating groove 101. The two adjacent platform frames 2 are hingedly connected via a first hinge seat 3, and a push-pull steel beam 21 is fixed to each of the two adjacent platform frames 2. The number of platform frames 2 located in the middle can be adaptively increased or decreased according to the length of the simulated foundation.

[0044] The vertical jacks 4 are multiple and are installed on the bottom surface of the receiving groove 101. The telescopic ends of the vertical jacks 4 are connected to the push-pull frame 5, which can push or pull the push-pull steel beam 21, thereby adjusting the local arching or sinking of the platform frame 2. The total lifting stroke of the vertical jacks 4 is not less than 300mm, and the installation height of the platform frame is designed according to the pre-lifting amount of the jacks of not less than 110mm to meet the vertical position adjustment requirements of -100mm to +180mm.

[0045] The platform frame transverse adjustment screw rods 6 are hingedly mounted on the front and rear side walls of the accommodating groove 101. The telescopic ends of the platform frame transverse adjustment screw rods 6 are hingedly connected to the platform push plates 7 for pushing the platform frame 2 to move transversely.

[0046] Isolation steel plates 8, which are laid side by side on multiple platform frames 2. The isolation steel plates 8 are connected to the platform frames 2 by bolts. Multiple connecting pins are evenly distributed and fixed on the top surface of the isolation steel plates 8. A concrete seat 9 is cast on the top surface of the isolation steel plates 8. Multiple connecting pins are pre-embedded in the concrete seat 9. A track structure 10 is fixed on the concrete seat 9;

[0047] The track lateral adjustment screw rods 11 are hingedly mounted on the front and rear side walls of the accommodating groove 101. The telescopic ends of the track lateral adjustment screw rods 11 are hingedly connected to track push plates 12 for pushing the track structure 10 to move laterally.

[0048] Among them, the bolts between the isolation steel plate 8 and the platform frame 2 and the connecting pins between the isolation steel plate 8 and the concrete seat 9 can simulate the interlayer tension to realize the settlement condition where there is a connection between layers on the rigid foundation.

[0049] The push-pull frame 5 includes:

[0050] A push plate 51, the bottom end of which is connected to the telescopic end of the vertical jack 4;

[0051] A support column 52, the lower end of the support column 52 is fixedly connected to the top of the push plate 51;

[0052] A pull-down plate 53, the bottom end of which is fixedly connected to the upper end of the support column 52;

[0053] Among them, the push-pull steel beam 21 is located between the top push plate 51 and the pull-down plate 53, so that the top push plate 51 pushes the push-pull steel beam 21, or the pull-down plate 53 pulls down the push-pull steel beam 21, thereby realizing the local arching or sinking adjustment of the platform frame 2.

[0054] The track lower foundation deformation simulation test platform also includes a plurality of vertical locking screws 13 installed on the bottom surface of the accommodating groove 101. The telescopic end of the vertical locking screw 13 is hingedly connected to the bottom end of the push plate 51, and is used to lock the platform position when needed to prevent the hydraulic system from leaking and causing the platform position to change.

[0055] A. Simulating and Locking the Test Platform's Vertical Deformation: Vertical jacks 4, driven by hydraulic fluid from the pumping station, move the platform frame vertically downward or upward. High-precision displacement sensors are installed on vertical jacks 4 to measure the jack's elevation and downward movement in real time during the test. Once the jacks reach their target position, they are locked in place by vertical locking screws 13.

[0056] B. Horizontal Movement and Locking of the Platform Frame: The platform frame is moved horizontally by turning the screw adjustment device on the platform frame's horizontal adjustment screw 6. After moving to the target position, lock the platform frame's horizontal adjustment screw 6 on both sides.

[0057] C. Horizontal Movement and Locking of the Track Structure: The track structure is moved horizontally by turning the screw adjustment device on the track horizontal adjustment screw 11. After moving to the target position, lock the track horizontal adjustment screws 11 on both sides.

[0058] The above A, B, and C mechanisms are adjusted separately to complete the compliance test of the deformation simulation curve.

[0059] The test platform of the present invention has a total length of not less than 80m and is arranged in sections along the longitudinal direction of the line. The length of each unit is not less than 2.5m and the width is not less than 3m.

[0060] Within the full length of the platform, the vertical adjustment range is: -100mm (sinking) to +180mm (arching), and the horizontal adjustment range is: 120mm (lateral).

[0061] In some embodiments of the present invention, longitudinal ribs and transverse ribs are provided at the bottom of the platform frame 2 to increase the rigidity of the platform frame and reduce deformation of the frame during the test. The transverse ribs are provided at equal intervals along the longitudinal direction of the platform, and the longitudinal ribs are provided corresponding to the center line of the platform and the jack loading position.

[0062] In another embodiment, a joint cover plate 14 is laid between two adjacent isolation steel plates 8. The joint cover plate 14 covers the gap between the two adjacent isolation steel plates 8, thereby preventing the two isolation steel plates 8 from directly butting against each other, which may cause overflow of concrete through the butt joint gap during pouring.

[0063] The platform frame lateral adjustment screw rod 6 and the track lateral adjustment screw rod 11 are both connected to the groove wall of the receiving groove 101 through the second hinge seat 15. This makes the platform frame lateral adjustment screw rod 6 and the track lateral adjustment screw rod 11 movably connected to the receiving groove, improving the flexibility of the platform frame lateral adjustment screw rod 6 and the track lateral adjustment screw rod 11 when used.

[0064] The platform frame 2 located at the leftmost end is connected to the groove wall of the accommodating groove 101 through the third hinge seat 16.

[0065] The track lower foundation deformation simulation test platform also includes a lateral adjustment screw rod 17, which is connected to the groove wall of the accommodating groove 101 through a fourth hinge seat 18, and the telescopic end of the lateral adjustment screw rod 17 is hingedly connected to the platform frame 2 located at the rightmost end.

[0066] When building the platform frame, the length of the transverse adjustment screw rod 17 can be adjusted according to the gap between the platform frame and the receiving groove to complete the connection between the platform frame and the receiving groove.

[0067] The platform frame of the present invention is movably connected to the accommodating groove via the third hinge seat and the fourth hinge seat, so that it can move laterally under the push of the platform frame's lateral adjustment screw rod 6, thereby realizing deformation simulation of the platform frame during lateral movement.

[0068] A high-precision displacement sensor is installed on the vertical jack 4 to measure the lifting and sinking height of the vertical jack 4 in real time during the test. The displacement of the jack is integrated and controlled by the hydraulic system, and the displacement can be adjusted at a single point or synchronously as a whole.

[0069] The test platform of the present invention can realize the simulation of the composite deformation mode of the lower foundation with a vertical amplitude of 100 mm / wavelength of 80 m and an upward arch and a lateral amplitude of 20 mm / wavelength of 40 m.

[0070] (1) Install the vertical jacks 4, the vertical locking screw 13 and build the test platform frame: This embodiment takes the total length of the platform as 80m and the length of the platform frame unit as 2.5m as an example, that is, a total of 32 platform frames are set along the longitudinal direction of the track (including 2 end platform frames and 31 middle platform frames), and the vertical jacks 4 are arranged in pairs at intervals of 2.5m along the longitudinal direction of the track, with a total of 31 groups, numbered A-1# to A-31#.

[0071] (2) Install the platform frame transverse adjustment screw rods 6: The platform frame transverse adjustment screw rods 6 are arranged in pairs along the longitudinal direction of the track at a spacing of 2.5m, with a total of 31 groups, numbered B-1# to B-31#.

[0072] (3) Install the track structure 10 on the platform according to the test plan.

[0073] (4) Installing the track transverse adjustment screw rod 11: The position of the track transverse adjustment screw rod 11 can be determined according to the actual unit segmentation of the track structure. In this embodiment, the track transverse adjustment screw rods 11 are arranged in pairs at a spacing of 4m along the longitudinal direction of the track, with a total of 19 groups, numbered C-1# to C-19#.

[0074] (5) The deformation amount is controlled by setting each point through a control system or manually.

[0075] This example takes the vertical simulation of the cosine curve arch deformation with a wavelength of 80m and a deformation amplitude of 100mm and the horizontal simulation of the cosine curve lateral displacement with a wavelength of 40m and a deformation amplitude of 20mm as an example:

[0076] In the vertical direction, the deformation y (unit: mm) at the distance x (unit: m) from the end of the platform frame is:

[0077] y=-40·cos(π·x / 40)+40

[0078] For this embodiment, the deformation amount yn (unit: mm) of the nth group of vertical jacks An# is set to:

[0079] y n =-40·cos(π·2.5n / 40)+40

[0080] In the transverse direction, the deformation z (in mm) at a distance x (in m) from the end of the platform frame is:

[0081] y=-10·cos(π·x / 20)+10

[0082] For this embodiment, the deformation zn (unit: mm) of the lateral adjustment screw rod Bn# of the nth group of platform frames is set to:

[0083] z n =-10·cos(π·2.5n / 40)+10

[0084] The deformation of the lateral adjustment screw rods of the platform frames on both sides is set in opposite directions.

[0085] Set the deformation zn (in mm) of the lateral adjustment screw rod Cn# of the nth track group to:

[0086] z n =-10·cos(π·4n / 40)+10

[0087] The lateral adjustment screws of the tracks on both sides are set in opposite directions.

[0088] (6) After the deformation is set, the vertical locking screws and the lateral adjustment screws are locked in sequence. During the deformation adjustment process, all screws are under pressure but not tension, so as to reduce the local stress on the connection device and improve the reliability and safety of the test process. After the locking is completed, the static and dynamic performance tests of the track structure can be carried out on the platform according to the test requirements.

[0089] In this invention, displacement sensors are installed on each jack during arching and sinking simulations to accurately measure and control the jack's lift height (i.e., the platform's lifting and lowering position). During lateral movement simulations, displacement can be measured manually (using a ruler). Both the platform and track structure can be moved laterally to simulate different relative positions of the foundation and track.

[0090] The advantages of the present invention are as follows:

[0091] (1) Through the precise control of the multi-directional deformation adjustment mechanism of the test platform, namely the vertical jack, the platform frame lateral adjustment screw, and the track lateral adjustment screw, the deformation simulation of the track lower foundation with different wavelengths of 5-80m within the full length of the platform can be realized.

[0092] (2) This test platform can fill the technical gap in the field of accurate simulation test equipment for the deformation of the lower foundation of a full-scale track structure.

[0093] (3) The test platform can achieve high-precision control of foundation deformation with different deformation directions, ranges, and change rates, providing reliable test conditions and technical support for the study of the interaction mechanism between the track structure and the underlying foundation deformation.

[0094] (4) The platform frame used in the present invention increases the structural rigidity by setting longitudinal ribs and transverse ribs, and increases the overall stability of the platform by hinged connections between the platform frames. It can effectively control the deformation of the platform structure itself during the test. The platform frame can bear the dead weight of the track structure greater than 5t / m, which meets the simulation test requirements of the full-scale track structure.

[0095] (5) In view of the problem that the existing technology has deformation simulation layers, lower foundations, and track parts that are all arranged in layers, only pressure can be transmitted between layers but not tension. When simulating settlement deformation, deformation can only be achieved by relying on the deadweight of the upper structure. This is only suitable for simulating settlement conditions on earthen roadbeds and cannot simulate settlement conditions with interlayer connections on rigid foundations such as tunnels and bridges. The present invention uses double-acting hydraulic jacks in the vertical direction to achieve push-pull bidirectional effects. Bolts, connecting pins, and other connectors are provided between the platform frame and the track structure to simulate interlayer tension, thereby achieving accurate simulation of track structures on rigid foundations such as tunnels and bridges.

[0096] (6) In view of the problem that the existing technology uses a single adjustable support as the supporting structure and adjustment device for the entire test device and the upper track, which has low deformation adjustment ability and relatively poor long-term stability and reliability, the present invention sets a vertical hydraulic jack and a vertical locking screw in pairs at the bottom of the platform. The jack is responsible for providing the load required for the arch / settlement deformation simulation, with strong loading capacity and large deformation amplitude; after loading to the set deformation, the locking screw is responsible for fixing the platform position, improving the long-term maintenance ability of the simulated foundation deformation, and facilitating various static and dynamic tests under foundation deformation conditions on the test platform.

[0097] (7) In response to the problem that the existing technology can only simulate the vertical deformation of the foundation, the present invention, in addition to simulating vertical deformation, provides a platform frame lateral adjustment screw and a track lateral adjustment screw, so that the test device can also simulate the lateral deformation of the lower foundation in the horizontal direction. Through the independent or combined action of the vertical jack, locking screw and lateral screw, it is possible to simulate the foundation deformation mechanical state of more complex working conditions in actual engineering, significantly improving the authenticity and engineering applicability of the simulation test.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0099] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A track lower foundation deformation simulation test platform, characterized in that: include: A support base (1), wherein the support base (1) has a receiving groove (101); The platform frames (2) are arranged in a plurality, and the two platform frames (2) located at the left and right ends are respectively hingedly connected to the left and right groove walls of the accommodating groove (101). The two adjacent platform frames (2) are hingedly connected via a first hinge seat (3), and a push-pull steel beam (21) is fixed on each of the two adjacent platform frames (2); A plurality of vertical jacks (4) are installed on the bottom surface of the receiving groove (101), and the telescopic ends of the vertical jacks (4) are connected to a push-pull frame (5). The push-pull frame (5) can push or pull down the push-pull steel beam (21), thereby achieving the adjustment of the partial upward arch or downward sinking of the platform frame (2); The platform frame transverse adjustment screw rods (6) are hingedly mounted on the front and rear side groove walls of the accommodating groove (101), and the telescopic ends of the platform frame transverse adjustment screw rods (6) are hingedly connected to a platform push plate (7) for pushing the platform frame (2) to move transversely; Isolation steel plates (8), the isolation steel plates (8) are multiple and laid side by side on the multiple platform frames (2), the isolation steel plates (8) and the platform frames (2) are connected by bolts, a plurality of connection pins are evenly distributed and fixed on the top surface of the isolation steel plates (8), a concrete seat (9) is cast on the top surface of the isolation steel plates (8), a plurality of the connection pins are pre-buried in the concrete seat (9), and a track structure (10) is fixed on the concrete seat (9); A plurality of track transverse adjustment screw rods (11) are hingedly mounted on the front and rear side walls of the accommodating groove (101), and a telescopic end of the track transverse adjustment screw rod (11) is hingedly connected to a track push plate (12) for pushing the track structure (10) to move transversely; The bolts between the isolation steel plate (8) and the platform frame (2) and the connecting pins between the isolation steel plate (8) and the concrete seat (9) can simulate interlayer tension to achieve a settlement condition in which there is a connection between layers on a rigid foundation.

2. A track lower foundation deformation simulation test platform according to claim 1, characterized in that: The push-pull frame (5) comprises: A push plate (51), the bottom end of which is connected to the telescopic end of the vertical jack (4); A support column (52), wherein the lower end of the support column (52) is fixedly connected to the top end of the push plate (51); A pull-down plate (53), the bottom end of the pull-down plate (53) being fixedly connected to the upper end of the support column (52); Wherein, the push-pull steel beam (21) is located between the push plate (51) and the pull-down plate (53), so that the push plate (51) pushes the push-pull steel beam (21), or the pull-down plate (53) pulls down the push-pull steel beam (21), thereby realizing the adjustment of the local upward arch or downward sinking of the platform frame (2).

3. A track lower foundation deformation simulation test platform according to claim 2, characterized in that: It also includes a plurality of vertical locking screw rods (13) installed on the bottom surface of the accommodating groove (101), and the telescopic ends of the vertical locking screw rods (13) are hingedly connected to the bottom end of the pushing plate (51) to lock the platform position when necessary to prevent the hydraulic system from leaking and causing the platform position to change.

4. The track lower foundation deformation simulation test platform according to claim 1, characterized in that: A joint cover plate (14) is laid between two adjacent isolation steel plates (8).

5. The track lower foundation deformation simulation test platform according to claim 1, characterized in that: The platform frame transverse adjustment screw rod (6) and the track transverse adjustment screw rod (11) are both connected to the groove wall of the accommodating groove (101) through a second hinge seat (15).

6. The track lower foundation deformation simulation test platform according to claim 1, characterized in that: The platform frame (2) located at the leftmost end is connected to the groove wall of the accommodating groove (101) through a third hinge seat (16).

7. The track lower foundation deformation simulation test platform according to claim 1, characterized in that: It also includes a transverse adjustment screw rod (17), which is connected to the groove wall of the accommodating groove (101) through a fourth hinge seat (18), and the telescopic end of the transverse adjustment screw rod (17) is hingedly connected to the platform frame (2) located at the rightmost end.

8. The track lower foundation deformation simulation test platform according to claim 1, characterized in that: A high-precision displacement sensor is provided on the vertical jack (4) for measuring the lifting and sinking heights of the vertical jack (4) in real time during the test.

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