A steel truss type track structure for seamless maglev track panel and its construction method

Abstract

The present invention discloses a steel truss type track structure for seamless maglev track slabs, which mainly consists of a steel truss type track slab, a fastener system, a rail support table, etc. from top to bottom. The steel truss type track slab includes an induction plate, an F-shaped steel, a steel truss sleeper plate, a steel truss side web, a steel truss middle web and a rail. The rails are longitudinally welded into continuous rails, and the fastener system locks the continuous rails in a longitudinally non-restrained clamping manner; the adjacent sections of the F-shaped guide rails in a single steel truss type track slab are assembled in close contact with a "zero" rail gap. The main design idea of the steel truss type track structure is to consider designing the medium and low speed maglev track slabs in a seamless manner and laying them in the form of a seamless track; a "zero" rail gap is taken between the track slabs to provide a continuous and flat F-rail suspension detection surface for the suspension gap sensor to the greatest extent, ensuring that the suspension control system does not need to work across the rail gap.

Description

Technical Field

[0001] The invention belongs to the field of medium and low speed maglev transportation, and in particular relates to a steel truss track structure of a seamless maglev track arrangement and a construction method thereof. Background Art

[0002] Low- and medium-speed maglev transportation is a mode of transportation in which the maglev train uses the principle of attracting ferromagnetic materials (F-type guide rails) with normal conductive magnets, relies on electromagnetic force to achieve suspension, support and guidance of the maglev train, and drives the train forward through the electromagnetic force generated by the linear asynchronous motor, realizing the train running around the track without contact. It is a highly competitive green rail transportation tool because of its advantages such as green environmental protection, high safety, strong climbing ability, small turning radius, low construction cost, and low operation and maintenance cost.

[0003] After nearly 40 years of continuous exploration and improvement, my country has fully mastered the core technology of medium and low-speed maglev with independent intellectual property rights, and has successfully built the Changsha Maglev Express and Beijing S1 Line and put them into operation completely relying on its own scientific and technological strength. The operation status is very stable. Practice has proved that the medium and low-speed maglev transportation system is fully capable of engineering and industrialization implementation, and its comprehensive technical level has reached the world's advanced level. It is an outstanding representative of self-reliance in rail transportation technology. However, domestic and foreign scholars have conducted little research on the track structure technology of medium and low-speed maglev transportation, resulting in a relatively single type of track structure that can be applied to engineering. At present, Japan's Nagoya Eastern Hills Line, South Korea's Incheon Airport Maglev Line, domestic related maglev test lines (Shanghai Lingang Line, Tangshan Test Line, Zhuzhou Test Line), Changsha Maglev Express and Beijing Maglev S1 Line all use steel rail sleeper track structure. The basic type of this track structure is derived from HSST technology. From top to bottom, it is mainly composed of rails, fasteners, rail bearings, etc. It has mature technology and rich experience in design, construction and operation.

[0004] As one of the key equipment for medium and low speed maglev transportation, the track structure bears the heavy responsibility of supporting and guiding the operation of trains. Compared with traditional wheel-rail railway tracks, it not only has the function of bearing and transmitting the train's gravity, guiding force, traction and braking force, but also needs to form an electromagnetic control circuit with the electromagnets, linear induction motors and suspension gap sensors installed on the maglev vehicle to provide support for the suspension, guidance, driving and braking of the train.

[0005] For the levitation control system of medium and low speed maglev, the active electromagnetic levitation method is adopted. Its working principle is as follows: The distance between the levitation gap sensor and the levitation detection surface of the F-rail is measured, which is equivalent to measuring the levitation gap between the electromagnet and the F-rail. Based on the principle of electromagnetic induction, the excitation coil of the levitation gap sensor generates a changing magnetic field, which acts on the F-rail and generates eddy currents; the magnetic field formed by the eddy currents in turn acts on the detection coil of the levitation gap sensor, inducing a voltage that changes with the size of the levitation gap. This working principle can convert the displacement signal into an electrical signal to achieve the measurement of the size of the levitation gap. With the position feedback of the levitation gap in the levitation control system, by adjusting the current in the electromagnet, the electromagnetic force is changed to actively adjust the levitation stability of the train. Thus, providing a continuous and flat F-rail levitation detection surface is very important for the stable operation of the levitation control system.

[0006] The rail sleeper track structure is paved as a whole unit with maglev track panels. In order to adapt to the expansion and contraction deformation caused by temperature changes between the track panel and the lower foundation, the rail sleeper track structure is laid with track panels in the form of jointed track, forming rail gaps between adjacent track panels. The size of the reserved rail gap should meet the requirement that the locked track panel has enough space to release the temperature stress under the control of the longitudinal resistance; that is, when the locked track panel reaches the historical highest temperature, the rail gap value should not be zero to ensure that the track panels do not press against each other, and when it reaches the historical lowest temperature, the rail gap value does not exceed the structural rail gap to ensure the smooth crossing of the rail gap by the maglev train.

[0007] In order to ensure the smoothness at the joint of the track panel and that the support wheels of the train can pass through the rail gap smoothly in the rescue mode, the setting of the reserved rail gap makes it necessary to connect adjacent track panels with a track panel expansion joint, and strict control is required over the manufacturing and installation accuracy of the track panel and its expansion joint, mainly referring to the misalignment (vertical and horizontal) accuracy index of the track panel; currently, the conventional jointed tracks of medium and low speed maglev transportation include Type I (with a ±20 mm expansion and contraction amount), Type II (capable of adapting to a maximum ±40 mm expansion and contraction amount), and Type III expansion joints (capable of adapting to a maximum ±60 mm expansion and contraction amount). The structures and construction assembly methods of Type I, Type II, and Type III expansion joints are different; at the same time, due to the setting of the expansion structure, the F-rail also needs to be disconnected after laying a certain length, unable to provide a continuous and flat F-rail levitation detection surface for the levitation gap sensor, which is not conducive to the stable operation of the train levitation control system.

[0008] Currently, there are mainly three typical types of medium and low speed maglev track structures: rail sleeper track structure, direct-connected track structure without sleepers, and integral bed track structure.

[0009] In the utility model patent with the authorized announcement number CN 2869102 Y, a medium and low speed maglev train track is disclosed, where the track functional components are directly installed on both sides of the top of the track beam. The track functional components mainly consist of components such as an induction plate, an inverted U-shaped suspension rail, and a fixed frame structure. This solution has a simple structure and strong overall stiffness, which is beneficial to the stable and reliable operation of the maglev train. Disadvantages: To ensure the laying accuracy of the suspension rail, in addition to the manufacturing accuracy of the suspension rail and the installation accuracy between it and the fixed frame meeting the requirements, the track beam also needs to be finely processed and polished, resulting in a high cost; the track functional components are installed on both sides of the track beam, making the installation and construction inconvenient; during operation, the adjustment of the track geometric smoothness needs to be achieved by adding gaskets between the fixed frame and the suspension rail, or by adjusting the three-dimensional support of the bridge. Due to the lack of an operation platform, the adjustment operation is difficult; it is composed of track panel modules in series, and it is inevitable to install track panel expansion joints, which cannot be seamless and cannot provide a continuous F-rail suspension detection surface.

[0010] In the invention patent with the authorized announcement number CN 101063287 B, a track structure for medium and low speed maglev transportation and its manufacturing method are disclosed. The track structure includes a track beam, guide rails located on both sides of the upper surface of the track beam, and a connection structure connecting these two parts. The track beam type of the present invention is unified, saving formwork and reducing the manufacturing complexity and difficulty. The line curve longitudinal and cross slopes are set on the cushion blocks, greatly facilitating the adjustment of the line alignment, with a simple method and low cost. Using a tooling to form a track panel for guide rail positioning is convenient for guide rail alignment adjustment and improves construction efficiency. Disadvantages: The connection between the F-shaped steel and the track beam is weak, similar to a cantilever structure, with unreasonable force; due to installation space limitations, the types of cushion blocks and connecting steel webs of the concrete precast components are inconsistent in different curve sections, increasing the difficulty of design, manufacturing, and construction, and being extremely inconvenient for the operation of on-site construction personnel; it is composed of track panel modules in series, and it is inevitable to install track panel expansion joints, which cannot be seamless and cannot provide a continuous F-rail suspension detection surface. Additionally, although there are no devices in the middle of the track beam line, the beam surface is narrow and there is no guardrail, and the door is a side-opening door, making it impossible to be used for the daily maintenance of the line and the evacuation of passengers in case of emergency.

[0011] In the invention patent with the application publication number CN 110205882 A, a medium and low speed maglev track structure is disclosed, which includes a track beam, a track connector, and an F-shaped steel rail; an inclined installation surface is provided on the track beam; the track connector is installed on the above-mentioned inclined installation surface; the F-shaped steel rail is fixed to the upper end of the track connector. Compared with the rail sleeper track structure, the medium and low speed maglev track structure provided by the present invention omits the H-shaped sleepers and the rail support table, and its overall structure height is greatly reduced. Disadvantages: Although the number of components is reduced and the track structure height is lowered, the installation height between the contact rail and the F-rail of the medium and low speed maglev remains unchanged, which will inevitably cause the installation position of the contact rail to move downward. Due to the influence of the clearance, the height of the existing track beam will be insufficient, especially in the low-position line section, increasing the amount of concrete. The F-shaped steel is installed on the track beam through connectors, and the manufacturing precision of the track beam must be improved to meet the installation precision of the track, especially in the curve section, which must be achieved by rotating the track beam. The connectors embedded in the track beam not only require high-precision embedding, but also the structure bears a large shear stress, which is very unfavorable to the installation bolts. Once there is deformation, it is very difficult to ensure the geometric behavior of the track, especially the gauge and the level. It is composed of track panel modules in series, and it is inevitable to install track panel expansion joints, and it cannot be seamless, and it cannot provide a continuous F-rail suspension detection surface.

[0012] In the invention patent with the authorization announcement number CN 103485244 B, a medium and low speed maglev traffic integral ballast track structure is disclosed, which includes an induction plate, an F-shaped steel, an elastic support adjustment unit, a double-block sleeper, and a ballast, etc. The double-block sleepers are used to connect the F-shaped steels into a track panel, and the track panel is connected to the track beam by pouring the integral ballast and pre-embedding connecting steel bars to form an integral structure. The structure is simple, the integrity is strong, and the stability is good. Disadvantages: Angle steel members are used to install the F-shaped steel, the cantilever structure is weak, and the force is not very reasonable; the three-dimensional adjustable ability of the elastic support adjustment unit is limited, which is not conducive to the adjustment of the track geometric smoothness; the integral ballast is laid on the track beam surface, the ballast surface is wide and the structure height is not too low (requirements for the sleeper height and the minimum thickness of the concrete under the sleeper), and the secondary permanent load of the track is slightly larger; the integral ballast is clean and flat, but it is directly used as the channel for daily maintenance of the line and passenger evacuation in case of emergency, and its feasibility is poor and it is not safe. It is composed of track panel modules in series, and it is inevitable to install track panel expansion joints, and it cannot be seamless, and it cannot provide a continuous F-rail suspension detection surface.

[0013] In the invention patent with the authorization announcement number CN 105019319 B, a medium and low speed maglev transportation track system is disclosed, which includes a number of serially connected track slab modules, and each track slab module is independently fixed on the track beam; each track slab module includes a sleeper, a rail, a bearing elastic body, and a floor anchor sleeve; the rail is installed on the sleeper, and the track is fixedly connected to the sleeper to form the upper part of the track slab module; the bearing elastic body is located in the installation hole at the bottom of the sleeper and is used to fixedly connect the sleeper in the floor anchor sleeve; the bearing elastic body further includes an elastic damping device and a height adjusting device. The elastic damping device plays a role in vertical, horizontal and longitudinal positioning and limiting for the track system, and the height adjusting device plays a role in vertical positioning and fixing for the track system. The present invention can ensure the smoothness, safety and reliability of the medium and low speed maglev train. Each adjusting device is simple and reliable, with precise adjustment and convenient operation, and the laying, installation, maintenance and repair are very convenient. This solution is relatively good and the technology is mature. Disadvantages: The bearing elastic body system is relatively complex and has many components; when prefabricating the track beam, installation holes must be accurately reserved for the anchor bolts, which increases the prefabrication difficulty; the track slab modules are connected in series, and it is inevitable to install track slab expansion joints, and seamless connection cannot be achieved, and a continuous F-rail suspension detection surface cannot be provided.

[0014] In the invention patent with the authorization announcement number CN 106120489 B, a medium and low speed maglev track structure with a track slab connection device that ensures continuous signal acquisition is disclosed. On the basis of the existing medium and low speed maglev rail sleeper track structure, a U-shaped connecting plate is added at the track slab expansion joint, so that the suspension detection surface of the F-rail remains continuous along the line direction. This solution has a novel concept and simple installation. It can fully adapt to the expansion and contraction deformation of the track slab while effectively ensuring the continuous uninterruption of the maglev signal, thus ensuring the smooth and stable operation of the train. Disadvantages: The track slab misalignment index is within ±1 mm, so the thickness of the U-shaped connecting plate must be less than 1 mm. The component is thin and light, and it is difficult to maintain the strength and stability under the long-term expansion and contraction action of temperature changes. In addition, similarly, the installation of the track slab joint cannot be cancelled. Summary of the Invention

[0015] In view of at least one of the above-mentioned defects or improvement requirements in the prior art, the present invention provides a steel truss type track structure for a seamless maglev track panel and its construction method. It mainly consists of a steel truss type track panel, a fastener system, a rail support platform, etc. from top to bottom. The steel truss type track panel includes an induction plate, an F-shaped steel, a steel truss sleeper plate, a steel truss side web, a steel truss middle web and a rail. The steel truss sleeper plate, side web and middle web are firmly connected to the rail by welding or riveting to form the framework of the steel truss type track panel; then the F-shaped guide rail is fixed to the framework by connecting bolts to form the steel truss type track panel. The fastener system includes a clip type and a spring clip type fastener system, which fixes the steel truss type track panel on the rail support platform and can realize three-dimensional adjustment of the track geometry. The rail support platform is reliably and firmly connected to the rail support beam by embedded connecting steel bars. In addition, the steel truss type track panel adopts a seamless design to achieve a "zero" rail gap close assembly of the F-rails of a single track panel; it is laid on-site in the form of a seamless track, the rails are welded into continuous rails by flash welding, and the fastener system is used to longitudinally unrestrictedly clamp and press to handle the different expansion and contraction deformations caused by temperature changes between the track panel and the lower foundation, so as to achieve a "zero" rail gap laying between the F-rails, which can provide a continuous and flat F-rail suspension detection surface for the suspension gap sensor, is beneficial to the operation of the suspension control system, and makes the maglev train run more stably, more comfortably and more safely. At the same time, the track structure can cancel the setting of track panel expansion joints, simplify the manufacture and installation of track panels, improve the production and construction efficiency of track panels, and reduce the technical weak points of track panels. This track structure is novel in form, simple in structure, beautiful in appearance, mature in the processing technology of the framework and the construction and paving technology, and good in economy, which can promote the development of medium and low speed maglev track technology and has very important significance.

[0016] To achieve the above object, according to one aspect of the present invention, there is provided a steel truss type track structure for a seamless maglev track panel, which is successively provided with a steel truss type track panel, a fastener system and a rail support platform from top to bottom;

[0017] The steel truss type track panel includes an F-shaped guide rail, a steel truss T-shaped sleeper and a rail. The steel truss T-shaped sleeper is arranged transversely along the line, and its two ends are respectively fixed to the F-shaped guide rail along the line longitudinally and are fixed to the rail along the line longitudinally; the lower end of the rail is connected to the rail support platform through the fastener system;

[0018] The rails are longitudinally welded into continuous rails, and the fastener system locks the continuous rails in a longitudinally unrestricted clamping and pressing manner;

[0019] The adjacent segments of the F-shaped guide rails in a single steel truss type track panel are assembled in close contact with a "zero" rail gap.

[0020] Preferably, the steel truss T-shaped sleeper includes a steel truss sleeper plate and a steel truss web;

[0021] The steel truss sleeper slab is horizontally arranged, and the F-shaped guide rails are fixed at both ends of its upper surface, and the steel truss web is fixed at its lower surface.

[0022] The upper part of the rail passes through the steel truss web and is fixed to the lower surface of the steel truss sleeper slab.

[0023] Preferably, the steel truss web includes a steel truss side web and a steel truss middle web.

[0024] The steel truss middle web is arranged between the inner sides of the two rails, and the steel truss side webs are arranged on the outer sides of the two rails.

[0025] Preferably, the spacing of the steel truss sleeper slabs in the longitudinal direction of the line is 1 m to 1.2 m.

[0026] Preferably, the length of a single steel truss track panel is an integer multiple of the spacing of the steel truss sleeper slabs.

[0027] Preferably, the F-shaped guide rail includes an induction plate and an F-shaped steel.

[0028] The induction plate is fixed on the F-shaped steel, and the induction plates and F-shaped steels of adjacent segments in a single steel truss track panel are assembled in close contact with a "zero" rail gap.

[0029] Preferably, the rail is an I-shaped steel or a rail of a steel wheel-rail system.

[0030] Preferably, the fastener system is a clip-type or elastic rail clip-type fastener system.

[0031] Preferably, the fastener system fastens the rail by means of a spring plate type fastening, a pressing plate type fastening or an elastic rail clip type fastening.

[0032] To achieve the above object, according to another aspect of the present invention, there is also provided a construction method for the steel truss track structure of the seamless maglev track panel as described above, including the following steps:

[0033] S1. When assembling the track panel in the track panel factory, connect the induction plate and the F-shaped steel to form an F-shaped guide rail; by means of a connection method such as welding or riveting, firmly connect the steel truss T-shaped sleeper and the rail to form the skeleton of the steel truss track panel; then fix the F-shaped guide rail on the skeleton of the steel truss track panel to finally form the steel truss track panel.

[0034] S2. When laying the track panel on site, first, transport and hoist the steel truss track panel stored in the track-laying base to the installation position above the crosstie beam for initial laying of the track panel. Secondly, install the fastener system onto the steel truss track panel according to the design requirements and tighten the nuts to reach the design torque value. Furthermore, through the CPIII precise surveying technology and the construction method of the track panel support, finely adjust the three-dimensional coordinates of the steel truss track panel to the design position, pour the concrete of the crosstie platform to ensure that the anchor bolts of the fastener system are anchored into the ballast bed of the crosstie platform or the embedded casing; connect the crosstie platform and the crosstie beam reliably and firmly through the embedded connecting steel bars.

[0035] S3. Lay the track panel in the form of a continuous welded rail track: After the precise adjustment and laying of the track panel are completed, carry out the construction of the continuous welded rail track. That is, first, loosen the fastener system within at least the adjacent track panel range, weld the rails to form continuous rails, and then, according to the design requirements of the locking rail temperature, re-lock the continuous rails in a longitudinally non-restrained buckling manner with the fastener system; only connect the adjacent track panels through the continuous rails, and assemble the F-shaped guide rails in close contact with a "zero" rail gap.

[0036] As long as the above preferred technical features do not conflict with each other, they can be combined with each other.

[0037] Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention have the following beneficial effects:

[0038] 1. The steel truss track structure of the seamless maglev track panel of the present invention mainly consists of parts such as a steel truss track panel, a fastener system, and a crosstie platform from top to bottom. The steel truss track panel includes an induction plate, an F-shaped steel, a steel truss tie plate, a steel truss side web, a steel truss middle web, and a rail. Firmly connect the steel truss tie plate, side web, and middle web with the rail by welding or riveting to form the framework of the steel truss track panel; then fix the F-shaped guide rail on the framework through connecting bolts to form the steel truss track panel. The track panel structure has reasonable force, good stability, mature manufacturing and assembly technologies, large on-site installation space, convenient operation, less maintenance, and long service life. The fastener system fixes the steel truss track panel on the crosstie platform at intervals in an orderly manner, and can realize three-dimensional adjustment of the track geometry state, which is beneficial to the precise adjustment and laying of the track panel on site and the subsequent maintenance. The crosstie platform is reliably and firmly connected to the crosstie beam through the embedded connecting steel bars. The curve superelevation is realized by rotating the track panel and setting different crosstie platform heights, avoiding the spatial torsion of the crosstie beam, simplifying the design of the crosstie beam, and having good economy. The construction method of the track panel support and the CPIII precise surveying technology are simple, practical, efficient, fast, and the technology is mature, which can effectively ensure the good construction performance of the track structure and is beneficial to ensuring the high-precision construction requirements of the maglev track panel. This track structure form is novel, simple in structure, beautiful in appearance, with mature component processing and construction paving technologies and good economy.

[0039] 2. The steel truss type track structure of the seamless maglev track panel and its construction method of the present invention are designed with the seamless concept, realizing the "zero" rail gap close assembly of the F rails of a single track panel in the factory. There is no limit to the length of the F-shaped steel, which is beneficial to the cutting of the F-shaped steel raw material, effectively improving the utilization efficiency of the raw material and saving materials.

[0040] 3. The steel truss type track structure of the seamless maglev track panel and its construction method of the present invention are laid on-site in the form of a seamless line. The steel rails are welded into continuous steel rails by flash welding technology, converting the expansion and contraction problem of the F rails under temperature changes into the expansion and contraction problem of the entire track panel based on the steel rails; by using the longitudinal non-limiting fastening method of the fasteners, the problem of different expansion and contraction deformations caused by temperature changes between the track panel and the lower foundation is effectively solved, simplifying the design and construction difficulty of the track panel. After the track panel is constructed according to the seamless line, a "zero" rail gap is achieved between the F rails, providing a continuous and flat F rail suspension detection surface for the suspension gap sensor, which is beneficial to the operation of the suspension control system, improving the stability of the train suspension, and making the maglev train run more stable, comfortable and safe.

[0041] 4. The steel truss type track structure of the seamless maglev track panel and its construction method of the present invention. Compared with the wheel-rail system, the medium and low-speed maglev train applies a uniform load to the track structure, and the load is small. The steel truss type track panel can adjust the spacing of the steel truss sleeper plates to achieve force stability, generally set at a distance of 1m to 1.2m. Adjacent steel truss type track panels are connected and locked through welded long steel rails and fastener systems, with stable structure, and the track panel expansion joints in the existing track structure can be cancelled. Canceling the setting of the track panel expansion joints reduces the technical weak points of the track panel. In addition to saving the accessories and materials of itself, it also greatly reduces the manufacturing difficulty of the track panel, reduces the processing amount of the track panel ends, and improves the production efficiency of the track panel; similarly, on-site construction reduces the installation of track panel expansion joints, simplifies the construction process, and improves the construction efficiency.

[0042] 5. The steel truss type track structure of the seamless maglev track panel and its construction method of the present invention are designed with the seamless concept and constructed in the form of a seamless line, making the form and type of the maglev track panel more simplified, which can further improve the standardization and modularization of the track panel, obtain the best production order and social and economic benefits for the track panel production, and promote the high-quality development of the medium and low-speed maglev industry, which has very important significance.

[0043] 6. Combining with the working principle of the seamless line on the wheel-rail railway bridge, the steel truss type track structure of the present invention is laid in the form of a seamless line, which can adapt to the relative displacement between the track panel and the bridge. Within the range of bridges with a certain temperature span, it can be used as a technical means to solve the medium and low-speed maglev transportation crossing rivers and lakes in the form of large-span bridges. Description of the Drawings

[0044] Figure 1 is a schematic diagram of the steel truss track structure of the seamless maglev track slab according to an embodiment of the present invention;

[0045] Figure 2 is a top view of the steel truss track structure of the seamless maglev track slab according to an embodiment of the present invention;

[0046] Figure 3 is a cross-sectional schematic diagram of the steel truss track structure of the seamless maglev track slab according to an embodiment of the present invention. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be further described in detail below with reference to the specific implementation manners.

[0048] As a preferred embodiment of the present invention, as Figures 1-3 shown, the present invention provides a steel truss track structure of a seamless maglev track slab, which is provided with a steel truss track slab, a fastener system 8, and a rail support 9 from top to bottom in sequence; the steel truss track slab includes an F-shaped guide rail, a steel truss T-shaped sleeper, and a rail 7, the steel truss T-shaped sleeper is arranged transversely along the line, and its two ends are respectively fixed to the F-shaped guide rail along the longitudinal direction of the line and are fixed to the rail 7 along the longitudinal direction of the line; the lower end of the rail 7 is connected to the rail support 9 through the fastener system 8; the rail 7 is longitudinally welded into a continuous rail, and the fastener system 8 locks the continuous rail in a longitudinally non-restricted clamping manner; the adjacent sections of the F-shaped guide rails in a single steel truss track slab are assembled in close contact with a "zero" rail gap.

[0049] The F-shaped guide rail includes an induction plate 1 and an F-shaped steel 2; the induction plate 1 is fixed on the F-shaped steel 2, and the adjacent sections of the induction plate 1 and the F-shaped steel 2 in a single steel truss track slab are assembled in close contact with a "zero" rail gap.

[0050] The steel truss T-shaped sleeper includes a steel truss sleeper plate 4 and a steel truss web; the steel truss sleeper plate 4 is horizontally arranged, the two ends of its upper surface are fixed to the F-shaped guide rail, and its lower surface is fixed to the steel truss web; the upper part of the rail 7 passes through the steel truss web and is fixed to the lower surface of the steel truss sleeper plate 4.

[0051] The steel truss web includes steel truss side webs 5 and a steel truss middle web 6; the steel truss middle web 6 is arranged between the inner sides of two rails 7, and the steel truss side webs 5 are arranged on the outer sides of two rails 7. The steel truss side webs 5 and the steel truss middle web 6 are welded to the rails 7.

[0052] The spacing of the steel truss sleeper slabs 4 in the longitudinal direction of the line is 1 m to 1.2 m. The length of a single steel truss track panel is an integer multiple of the spacing of the steel truss sleeper slabs 4. The steel truss sleeper slabs 4 are made of steel plates, and plates with different widths, different thicknesses, and different materials can be used. The steel truss side webs 5 and the steel truss middle web 6 are both manufactured by cutting steel plates. In addition to the shapes shown in the figure, they can also be in the form of angle steel supports such as triangles, trapezoids, rectangles, etc.; plates with different thicknesses and different materials can be used.

[0053] The rails 7 can be various types of H-shaped steel or I-shaped steel. At the same time, under the condition of mature technology, the rails in the steel wheel-rail system are not excluded.

[0054] The fastener system 8 can be a clip-type or elastic clip-type fastener system. The way of clamping the rails can adopt elastic sheet clamping, pressing plate clamping or elastic clip clamping. When the geometric dimensions of the maglev track panel need to be adjusted through fasteners after installation, the fastener adjustment operations should be carried out selectively, at intervals, and in sequence. For a specific single set of fasteners, first unscrew the plastic sheath and nut, loosen the clamping parts, and make the parts of the single set of fasteners in a relaxed state. The lateral adjustment is achieved by adjusting the gauge block; the vertical adjustment is achieved by replacing the height-adjusting pads under the rails; the longitudinal adjustment is achieved by reinstalling and locking. After the adjustment is completed with the help of the track panel installation tool, all parts are restored in sequence according to the design requirements, and finally the adjustment of the track geometric dimensions is completed. Similarly, the same replacement and adjustment measures are taken for the maintenance and replacement of the fastener parts.

[0055] The construction method of the steel truss track structure of the seamless maglev track panel of the present invention includes the following steps:

[0056] S1. When assembling in the track panel factory, the induction plate 1 and the F-shaped steel 2 are connected by screws 11 to form an F-shaped guide rail. Through welding or riveting connection methods, the steel truss sleeper slabs 4, the steel truss side webs 5, and the steel truss middle web 6 are firmly connected to the rails 7 to form the skeleton of the steel truss track panel. Then, through the connecting bolts 3, the F-shaped guide rail is fixed on the skeleton of the steel truss track panel, and finally the steel truss track panel is formed. The maglev track panel is designed in a seamless manner, and the adjacent sections of the F-rails in a single track panel are assembled in close contact with a "zero" rail gap, as Figure 1As shown in A. The seamless design concept of the maglev track panel makes the maglev track panel more conducive to carrying out standardized and modular design and assembly; the standard length of a single track panel is generally an integer multiple of the spacing of 1 m to 1.2 m between the steel truss sleeper plates 4.

[0057] S2. When laying the track panel on site, first, the steel truss track panel stored in the track laying base is transported and hoisted to the installation position above the bearing rail beam 10 by trucks and cranes for initial laying of the track panel; secondly, the fastening system 8 is installed on the steel truss track panel according to the design requirements, and the nuts are tightened to reach the design torque value; furthermore, through the CPIII precise measurement technology and the construction method of the track panel support frame, the three-dimensional coordinates of the steel truss track panel are precisely adjusted to the design position, and the concrete of the bearing rail platform 9 is poured to ensure that the anchor bolts of the fastening system 8 are anchored into the bearing rail platform ballast or the embedded sleeve. Through the embedded connecting steel bars, the bearing rail platform 9 is reliably and firmly connected to the bearing rail beam 10.

[0058] S3. The track panel is laid in the form of a seamless railway line: after the precise laying of the track panel is completed, the seamless railway line construction is carried out, that is, first, the fastening system 8 within a certain range (at least within the adjacent track panels) is loosened, the steel rails 7 are formed into continuous steel rails by flash welding technology, and then according to the design requirements of the locking rail temperature, the fastening system 8 is re-locked to the continuous steel rails. By using the non-limiting longitudinal fastening method of the fasteners, the problem of different expansion and contraction deformations caused by temperature changes between the track panel and the lower foundation is solved. Only the continuous steel rails are used to connect between adjacent track panels, and the track panel expansion joints can be cancelled. For the track structure after laying, there is a "zero" rail gap between the F rails, providing a continuous and flat F rail suspension detection surface for the suspension gap sensor.

[0059] The steel truss type track structure of the seamless maglev track panel of the present invention mainly consists of parts such as a steel truss type track panel, a fastener system, and a rail support platform from top to bottom. Among them, the steel truss type track panel includes an induction plate, an F-shaped steel, a steel truss sleeper plate, a steel truss side web, a steel truss middle web, and a rail. The steel truss sleeper plate, side web, and middle web are firmly connected to the rail by welding or riveting to form the framework of the steel truss type track panel; then the F-shaped guide rail is fixed to the framework by connecting bolts to form the steel truss type track panel. The track panel structure has reasonable force, good stability, mature manufacturing and assembly technologies, large on-site installation space, convenient operation, less maintenance, and long service life. The fastener system fixes the steel truss type track panel on the rail support platform in an orderly interval, and can realize three-dimensional adjustment of the track geometry state, which is beneficial to the precise adjustment and laying of the track panel on-site and subsequent maintenance. The rail support platform is reliably and firmly connected to the rail support beam by pre-buried connecting steel bars. The curve superelevation is realized by rotating the track panel and setting different heights of the rail support platform, avoiding the spatial torsion of the rail support beam, simplifying the design of the rail support beam, and having good economy. The construction is carried out by using the track panel support method and CPIII precise surveying technology, which is simple, practical, efficient, fast, and the technology is mature, and can effectively ensure the good construction performance of the track structure, which is beneficial to ensuring the high-precision construction requirements of the maglev track panel. This track structure has a novel form, simple structure, beautiful appearance, mature component processing and construction paving technologies, and good economy.

[0060] For the steel truss type track structure of the seamless maglev track panel of the present invention and its construction method, the steel truss type track panel is designed with a seamless concept, realizing the "zero" rail gap close assembly of the F rail of a single track panel in the factory, having no limit on the length of the F-shaped steel, which is beneficial to the cutting of the F-shaped steel raw material, effectively improving the use efficiency of the raw material and saving materials.

[0061] For the steel truss type track structure of the seamless maglev track panel of the present invention and its construction method, the steel truss type track panel is laid on-site in the form of a seamless track. The rails are welded into continuous rails by flash welding technology, converting the expansion and contraction problem of the F rail under temperature change into the expansion and contraction problem of the entire track panel based on the rails; by using the longitudinal non-limiting fastening method of the fasteners, the problem of different expansion and contraction deformations caused by temperature change between the track panel and the lower foundation is effectively solved, simplifying the design and construction difficulty of the track panel. After the track panel is constructed according to the seamless track, there is a "zero" rail gap between the F rails, providing a continuous and flat F rail suspension detection surface for the suspension gap sensor, which is beneficial to the operation of the suspension control system, improving the stability of the train suspension, and making the maglev train run more stably, more comfortably, and more safely.

[0062] The steel truss type track structure of the seamless maglev track slab of the present invention and its construction method. Compared with the wheel-rail system, the medium and low speed maglev train applies a uniform load to the track structure, and the load is relatively small. The steel truss type track slab can adjust the spacing of the steel truss sleeper plates to achieve stable force, generally set at a distance of 1m to 1.2m. Adjacent steel truss type track slabs are connected and locked through welded long rails and fastener systems, with stable structure, and the rail slab expansion joints in the existing track structure can be cancelled. Cancelling the setting of the rail slab expansion joints reduces the technical weak points of the rail slab. In addition to saving the fitting materials of itself, it also greatly reduces the manufacturing difficulty of the rail slab, reduces the processing amount of the rail slab end, and improves the production efficiency of the rail slab; Similarly, on-site construction reduces the installation of rail slab expansion joints, simplifies the construction process, and improves the construction efficiency.

[0063] The steel truss type track structure of the seamless maglev track slab of the present invention and its construction method. The steel truss type track slab adopts a seamless design and is constructed in the form of a seamless line, making the form and type of the maglev track slab more simplified, which can further improve the standardization and modularization of the track slab, can obtain the best production order and social and economic benefits for the production of the track slab, can promote the high-quality development of the medium and low speed maglev industry, and has very important significance.

[0064] Combined with the working principle of the seamless line on the wheel-rail railway bridge, the steel truss type track structure of the present invention is laid in the form of a seamless line, can adapt to the relative displacement between the track slab and the bridge, and within the range of a bridge with a certain temperature span, can be used as a technical means to solve the medium and low speed maglev transportation crossing rivers and lakes in the form of a long-span bridge.

[0065] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steel truss type track structure for a seamless maglev track panel, characterized in that: a steel truss type track panel, a fastener system (8), and a rail support table (9) are successively provided from top to bottom; the steel truss type track panel includes an F-shaped guide rail, a steel truss T-shaped sleeper, and a rail (7). The steel truss T-shaped sleeper is arranged transversely along the line, and its two ends are respectively fixed to the F-shaped guide rails along the longitudinal direction of the line and are fixed to the rail (7) along the longitudinal direction of the line. The lower end of the rail (7) is connected to the rail support table (9) through the fastener system (8); the rails (7) are longitudinally welded into a continuous rail, and the fastener system (8) locks the continuous rail in a longitudinally non-restricted pressing manner; in a single steel truss type track panel, adjacent sections of the F-shaped guide rails are assembled in close contact with a "zero" rail gap; the steel truss T-shaped sleeper includes a steel truss type sleeper plate (4) and a steel truss type web; the steel truss type sleeper plate (4) is horizontally arranged, and the F-shaped guide rails are fixed at both ends of its upper surface, and the steel truss type web is fixed to its lower surface; the upper part of the rail (7) passes through the steel truss type web and is fixed to the lower surface of the steel truss type sleeper plate (4); the F-shaped guide rail includes an induction plate (1) and an F-shaped steel (2); the induction plate (1) is fixed on the F-shaped steel (2). In a single steel truss type track panel, adjacent sections of the induction plate (1) and the F-shaped steel (2) are assembled in close contact with a "zero" rail gap.

2. The steel truss type track structure for a seamless maglev track panel according to claim 1, characterized in that: the steel truss type web includes a steel truss type side web (5) and a steel truss type middle web (6); the steel truss type middle web (6) is arranged between the inner sides of the two rails (7), and the steel truss type side web (5) is arranged on the outer sides of the two rails (7).

3. The steel truss type track structure for a seamless maglev track panel according to claim 1, characterized in that: the spacing of the steel truss type sleeper plates (4) in the longitudinal direction of the line is 1 m to 1.2 m.

4. The steel truss type track structure for a seamless maglev track panel according to claim 3, characterized in that: the length of a single steel truss type track panel is an integer multiple of the spacing of the steel truss type sleeper plates (4).

5. The steel truss type track structure for a seamless maglev track panel according to claim 1, characterized in that: the rail (7) is an I-shaped steel or a rail of a steel wheel-rail system.

6. The steel truss type track structure for a seamless maglev track panel according to claim 1, characterized in that: the fastener system (8) is a pressing type or elastic clip type fastener system.

7. The steel truss type track structure for a seamless maglev track panel according to claim 6, characterized in that: the fastener system (8) presses the rail in a manner of elastic piece pressing, pressing plate pressing or elastic clip pressing.

8. A construction method for the steel truss type track structure for a seamless maglev track panel according to any one of claims 1-7, characterized in that, it includes the following steps: S1. When assembling in the track panel factory, connect the induction plate (1) and the F-shaped steel (2) to form an F-shaped guide rail; by means of welding or riveting, firmly connect the steel truss T-shaped sleeper to the rail (7) to form the skeleton of the steel truss type track panel; then fix the F-shaped guide rail on the skeleton of the steel truss type track panel to finally form the steel truss type track panel; S2. When laying the track panel on site, first transport and hoist the steel truss type track panel stored in the track laying base to the installation position above the bearing rail beam (10) for initial track panel laying; secondly, install the fastening system (8) on the steel truss type track panel according to the design requirements and tighten the nuts to reach the design torque value; furthermore, through the CPIII precise measurement technology and the construction method of the track panel support frame, finely adjust the three-dimensional coordinates of the steel truss type track panel to the design position, pour the concrete of the bearing rail platform (9) to ensure that the anchor bolts of the fastening system (8) are anchored into the bearing rail platform ballast bed or the embedded sleeve; through the embedded connecting steel bars, the bearing rail platform (9) is reliably and firmly connected to the bearing rail beam (10); S3. Lay the track panel in the form of continuous welded rail: after the precise adjustment and laying of the track panel are completed, then carry out the continuous welded rail construction, that is, first, loosen the fastening system (8) within at least the adjacent track panel range, weld the rails (7) to form a continuous long rail, and then, according to the design locking rail temperature requirements, re-lock the continuous long rail by the fastening system (8) in a longitudinally non-limiting buckling manner; Adjacent track panels are only connected by the continuous long rail, and the F-shaped guide rails are assembled in close contact with a "zero" rail gap.

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