A circular composite section continuous pipe beam

Abstract

This invention discloses a circular composite section continuous pipe beam, belonging to the field of vacuum maglev pipeline technology. It includes a circular pipe beam and a U-shaped precast slab disposed inside. The U-shaped precast slab has a first slot and a second slot for placing the maglev coil and cable. Two support blocks are provided at the bottom of the U-shaped precast slab, and an adjusting block is provided between the U-shaped precast slab and the support blocks. The length of the adjusting block is adjustable in at least one direction: transverse, longitudinal, or vertical. The circular composite section continuous pipe beam of this application can effectively reduce the amount of main beam construction materials, improve the bridge's spanning capacity, reduce the magnetic reluctance effect of the main beam materials, effectively solve the airtightness problem through the continuous structure, and exhibits excellent coil heat dissipation and resistance to atmospheric pressure.

Description

Technical Field

[0001] This invention belongs to the field of vacuum magnetic levitation pipeline technology, specifically relating to a circular composite cross-section continuous pipeline beam. Background Technology

[0002] For high-speed public transportation vehicles, whether airplanes or high-speed trains, the main resistance is air resistance. Air resistance limits the increase in speed and also results in huge energy consumption. In order to improve the operating speed of transportation vehicles, people have proposed a combination of vacuum tube and magnetic levitation technology.

[0003] To reduce air resistance during vehicle operation, vehicles can be enclosed in vacuum tubes to eliminate air resistance, and magnetic levitation technology can be used to replace traditional wheel-rail technology to eliminate mechanical friction resistance. This involves installing strong magnets on the train and electrical coils on the track; the electromagnetic force between the strong magnets and the electrical coils provides the levitation, guiding, traction, and braking forces required for train operation.

[0004] Currently, vacuum maglev pipeline technology has not yet been maturely implemented and applied. Existing designs typically use NU-type vacuum pipeline beams, which include an N-type pipeline cover and a U-type track beam. This type of vacuum pipeline beam has a large main structure and a large volume of concrete for the U-type track beam, making the beam somewhat bulky. This also hinders heat dissipation for the maglev coils, reduces the pipeline's net area, increases the pipeline blockage ratio, and limits the U-type track beam's ability to resist negative bending moments. Its structural form is only suitable for simply supported bridges, resulting in limited spanning capacity, a large number of expansion joints between beams, and poor pipeline airtightness. Furthermore, the bottom of the U-type track beam is flat to accommodate the prefabricated slab structure for mounting the maglev coils. However, in actual construction, it is difficult to ensure that the bottom of either the U-shaped pipe beam or the bottom of the precast slab structure is completely flat. This makes it difficult to arrange the maglev coils in the vacuum pipe according to the preset form during actual installation, affecting the magnetic force supply of the maglev coils. Furthermore, placing the precast slabs for installing the maglev coils directly on the U-shaped track beam will cause the magnetic resistance effect of the steel bars, steel structures, and other materials in the U-shaped track beam to be more pronounced when the maglev coils are working, ultimately leading to difficulties in the operation of the maglev train. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a circular composite cross-section continuous pipe beam to solve the problem that existing vacuum magnetic levitation pipes cannot guarantee the accuracy of the internal magnetic levitation coil arrangement.

[0006] To achieve the above objectives, the present invention provides a circular composite section continuous pipe beam, which includes a circular pipe beam integrally arranged in the radial direction, a U-shaped precast slab disposed within the circular pipe beam, and a first slot and a second slot opened on both sides of the U-shaped precast slab in the transverse direction. A magnetic levitation coil is installed in the first slot, and a cable for supplying power to the magnetic levitation coil is installed in the second slot. The bottom of the U-shaped precast slab is provided with two support pads in pairs. The two support pads are separated in the horizontal direction. The two support pads are connected to the bottom surface of the circular pipe beam, and the top surface of the two support pads is horizontal. An adjusting pad is also provided between the U-shaped precast slab and the two supporting pads. The length of the adjusting pad is adjustable in at least one direction, either horizontally, longitudinally, or vertically, so that the U-shaped precast slab is arranged within the circular pipe beam according to the required route.

[0007] As a further improvement of the present invention, the main body of the circular pipe beam is a steel-concrete composite structure, and at least one heat-conducting element is connected between the side wall of the U-shaped precast slab and the circular pipe beam, and the heat-conducting element forms a heat transfer channel between the U-shaped precast slab and the circular pipe beam.

[0008] As a further improvement of the present invention, at least one connecting channel is provided vertically on the bottom surface of the U-shaped precast slab. The connecting channel connects the upper and lower ends of the U-shaped precast slab, which is used to increase the net area of ​​the pipe and reduce the blockage ratio in the pipe.

[0009] As a further improvement of the present invention, two support rails are provided in pairs between the two side walls of the U-shaped precast slab, and the two support rails are hollow inside.

[0010] As a further improvement of the present invention, the adjusting pad is V-shaped, one bottom surface of the adjusting pad is in contact with the upper end surface of the supporting pad, and the other bottom surface of the adjusting pad is in contact with the inner wall of the circular pipe beam; the upper end surface of the adjusting pad is attached to the side wall of the U-shaped precast slab to separate the U-shaped precast slab from the circular pipe beam and the supporting pad respectively.

[0011] As a further improvement of the present invention, the adjusting pads include a plurality of pads arranged longitudinally along the circular pipe beam, and the lower end of the U-shaped precast slab is provided with a plurality of the adjusting pads, and each of the adjusting pads is adjustable during the construction of the U-shaped precast slab.

[0012] As a further improvement of the present invention, cable holes are provided on the side walls of both the circular pipe beam and the U-shaped precast slab, and the cable holes are used to connect the cable to an external power source.

[0013] As a further improvement of the present invention, the circular pipe beam is a multi-hole continuous beam structure, which consists of multiple beams arranged longitudinally, and the joints of the multiple circular pipe beams are provided with beam end expansion joints, and an openable and closable sealing door is provided on one side of the beam end expansion joint.

[0014] As a further improvement of the present invention, a bridge pier is also provided below the circular pipe beam.

[0015] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The circular composite section continuous pipe beam of the present invention adopts a radially integrated circular pipe beam structure, which makes the pipe beam have good structural strength, making the overall bridge span strong and the stress performance excellent. Moreover, the circular pipe has a higher clearance area than the traditional pipe, and the running blockage ratio of the maglev train is smaller. Secondly, by setting adjustment pads between the support pads and the U-shaped precast slab, the U-shaped precast slab can always be arranged and adjusted according to the line requirements by utilizing the adjustment ability of the adjustment pads. This avoids the accuracy error of the circular pipe beam, U-shaped precast slab and support pads in the construction and manufacturing process, and ensures that the maglev coil is installed and placed according to the set standard. This greatly reduces the construction difficulty and construction accuracy of the maglev pipe structure, while ensuring the stable operation of the maglev train in the later stage.

[0017] (2) The circular composite section continuous pipe beam of the present invention is prepared by using a steel-concrete composite structure to make a circular pipe beam, and a heat-conducting component is set between the U-shaped precast plate and the circular pipe beam. The excellent thermal conductivity of the steel-concrete composite structure is used to transfer the working heat energy of the maglev coil to the outside, which facilitates the heat dissipation of the maglev coil, ensures its stable operation, and avoids failure. In addition, the thermal insulation performance of the concrete layer of the pipe beam can provide a stable temperature field for the train operation in the pipeline and avoid the impact of direct sunlight on the operation of the equipment in the pipeline.

[0018] (3) The circular composite section continuous pipe beam of the present invention, by opening a connecting channel on the bottom surface of the U-shaped precast slab and reserving space between the circular pipe beam and the U-shaped precast slab, makes the internal space of the circular pipe beam connected as a whole, increases the net area inside the pipe, reduces the blockage ratio of the maglev train, and facilitates the maglev train to run inside the pipe.

[0019] (4) The circular composite section continuous pipe beam of the present invention, by setting multiple adjusting pads distributed longitudinally along the circular pipe beam, allows the adjusting pads to be adaptively adjusted according to the manufacturing precision of the U-shaped precast slab and the supporting pads, so as to ensure that the U-shaped precast slab can always be arranged according to the requirements of the line, and to ensure the normal installation and configuration of the maglev coil; in addition, the present application increases the distance between the maglev coil and the main structure of the pipe beam by using the U-shaped precast slab, thereby reducing the magnetic resistance effect of the main structure of the pipe beam on train operation. At the same time, the adjusting pads in the present application are cast in place. In order to avoid the U-shaped precast slab from contacting the inner wall of the circular pipe beam and causing the U-shaped precast slab to be placed unbalanced, the adjusting pads are used to separate the two. The cast in place adjusting pads are not easy to mix with steel reinforcement structures, so additional heat-conducting components are required to conduct the heat generated by the maglev coil during operation to the outside, so as to ensure the stable operation of the maglev coil.

[0020] (5) The circular composite section continuous pipe beam of the present invention has higher strength and stiffness through the circular pipe beam structure in the form of steel-concrete composite section. It is suitable for the structural scheme of long span bridge. Its main structure has small size, low self-weight, and low material consumption. It has better resistance to atmospheric pressure. The circular composite section has excellent positive and negative bending moment resistance. It is suitable for bridge types such as continuous beam. The continuous beam structure has better overall continuity, less expansion joints between beams, and good pipe air tightness. The continuous beam bridge type can be used for various construction methods such as support construction, prefabrication assembly, prefabrication erection, rotation, and jacking. It has good constructability. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of an existing vacuum magnetic levitation pipeline. Figure 2 This is a schematic cross-sectional view of the continuous pipe beam with a circular composite section in an embodiment of the present invention. Figure 3 This is a schematic diagram of the external structure of the circular composite cross-section continuous pipe beam in an embodiment of the present invention.

[0022] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Circular pipe beam; 2. U-shaped precast slab; 3. First slot; 4. Second slot; 5. Support pad; 6. Adjustment pad; 7. Heat-conducting component; 8. Connecting channel; 9. Support rail; 10. Cable hole; 11. Beam end expansion joint; 12. Sealing door; 13. Pier. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the 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 merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Example: Please see Figures 1-3 In a preferred embodiment of the present invention, the circular composite section continuous pipe beam includes a circular pipe beam 1 integrally arranged radially, and a U-shaped precast slab 2 disposed inside the circular pipe beam 1. The U-shaped precast slab 2 has a first slot 3 and a second slot 4 opened on both sides of the transverse direction. A magnetic levitation coil is installed in the first slot 3, and a cable for powering the magnetic levitation coil is installed in the second slot 4. Two support pads 5 are arranged in pairs at the bottom of the U-shaped precast slab 2. The two support pads 5 are separated in the transverse direction and are in contact with the bottom surface of the circular pipe beam 1. The top surfaces of the two support pads 5 are horizontal. At the same time, an adjusting pad 6 is also provided between the U-shaped precast slab 2 and the two support pads 5. The length of the adjusting pad 6 is adjustable in at least one direction, such as transverse, longitudinal, or vertical, so that the U-shaped precast slab 2 is arranged in the circular pipe beam 1 according to the required route. Here, the U-shaped precast slab 2 is arranged along the route requirements inside the circular pipe beam 1, indicating that the height, curvature, and bending of the U-shaped precast slab 2 itself can be adjusted and modified according to the set construction standards to ensure construction accuracy.

[0029] Specifically, the circular composite section continuous pipe beam in this application adopts a radially integrated circular pipe beam 1 structure, which gives the pipe beam itself good structural strength, strong overall bridge spanning capacity, and superior stress performance. Moreover, the circular pipe has a higher clearance area than traditional pipes, resulting in a smaller obstruction ratio for the maglev train. Secondly, by setting an adjustment pad 6 between the support pad 5 and the U-shaped precast slab 2, this application utilizes the adjustable capability of the adjustment pad 6 in the horizontal, longitudinal, and vertical directions to ensure that the U-shaped precast slab 2 can always be arranged according to the requirements of the line. This avoids precision errors in the construction and manufacturing process of the circular pipe beam 1, U-shaped precast slab 2, and support pad 5, ensuring that the maglev coil is installed and placed according to the set standards. This greatly reduces the construction difficulty and accuracy of the maglev pipe structure while ensuring the smooth operation of the maglev train in the later stages.

[0030] Preferably, in this application, the lateral direction is perpendicular to the direction in which the pipe beam is arranged, the longitudinal direction is the direction in which the pipe beam extends, and the vertical direction is the height direction.

[0031] Furthermore, the adjustment pad 6 in this application is cast in place according to the set dimensions, and then appropriately adjusted according to the actual dimensions of the U-shaped precast slab 2 and the support pad 5 to ensure that the U-shaped precast slab 2 can be arranged according to the preset requirements.

[0032] Preferably, the second slot 4 of this application is further provided with a coil support block. The coil support block is used to place the maglev coil to lift the maglev coil to a set height. At the same time, the coil support block closes the second slot 4 to confine the cables and other items placed inside the second slot 4, so as to prevent the maglev train from sucking the cables out of the second slot 4 at high speed.

[0033] More preferably, the main body of the circular pipe beam 1 in this application is a steel-concrete composite structure, and at least one heat-conducting element 7 is connected between the side wall of the U-shaped precast slab 2 and the circular pipe beam 1, forming a heat transfer channel between the U-shaped precast slab 2 and the circular pipe beam 1. Since this application is a vacuum magnetic levitation pipe structure, the inside of the pipe needs to be evacuated to reduce air resistance. When the inside is in a vacuum state, due to the large size of the side wall of the U-shaped precast slab 2, the poor thermal conductivity of concrete, and the heat generated by the magnetic levitation coil itself, heat will accumulate at the magnetic levitation coil, affecting its normal operation. The adjustment pad 6 is made of concrete, separating the U-shaped precast slab 2 from the circular pipe beam 1. This makes it difficult for the heat generated by the maglev coil in the U-shaped precast slab 2 to be transferred to the outside. Therefore, this application sets the circular pipe beam 1 as a steel-concrete composite structure, and by setting a heat-conducting element 7 between the circular pipe beam 1 and the U-shaped precast slab 2, the heat generated on the U-shaped precast slab 2 is transferred to the circular pipe beam 1 through the heat-conducting element 7, and then transferred to the outside through the steel structure inside the circular pipe beam 1, thereby improving the heat dissipation efficiency of the maglev coil. Optionally, the U-shaped precast slab 2 can also be made of steel-concrete composite structure to improve heat transfer efficiency. Furthermore, the concrete layer of the circular pipe beam 1 with steel-concrete composite structure has better thermal insulation function, which can provide a stable temperature field for the operation of the maglev train inside the pipe.

[0034] Preferably, the heat-conducting component 7 is a flat steel grating plate, which is arranged horizontally and connects the U-shaped precast plate 2 to the circular pipe beam 1. The heat-conducting component 7 has a hollow structure, which on the one hand allows the space formed between the U-shaped precast plate 2 and the circular pipe beam 1 to be connected with the operating space of the maglev train, increasing the clearance area, and on the other hand can form a walking platform for personnel inside the maglev train to leave the maglev pipe.

[0035] Furthermore, as a preferred embodiment of the present invention, the bottom surface of the U-shaped precast slab 2 in this application is provided with at least one vertically extending channel 8, which connects the upper and lower ends of the U-shaped precast slab 2. As described above, when the U-shaped precast slab 2 is placed inside the circular pipe beam 1, the U-shaped precast slab 2 will divide the circular pipe beam 1 into two spaces. The maglev train runs in the upper space of the circular pipe beam 1, and the lower space is wasted. In order to increase the net area inside the circular pipe beam 1, this application provides vertically extending channels in the U-shaped precast slab 2 to connect the upper and lower ends of the U-shaped precast slab 2.

[0036] More preferably, in this application, two supporting rails 9 are also provided in pairs between the two side walls of the U-shaped precast slab 2, and the two supporting rails 9 are hollow inside. The supporting rails 9 are used to support the maglev train later. Since the U-shaped precast slab 2 in this application is pre-prepared, by making the supporting rails 9 a hollow structure, the overall weight of the U-shaped precast slab 2 can be reduced, thus reducing the transportation cost of the U-shaped precast slab 2. Correspondingly, the inner side of the supporting rails 9 is also provided with a ring-shaped boss. Optionally, the U-shaped precast slab 2 in this application can be made of lightweight aggregate concrete, which can further reduce its weight and facilitate installation and transportation.

[0037] Furthermore, as a preferred embodiment of the present invention, the adjusting shim 6 in this application is V-shaped. One bottom surface of the adjusting shim 6 is in contact with the upper end surface of the supporting shim 5, and the other bottom surface of the adjusting shim 6 is in contact with the inner wall of the circular pipe beam 1. The upper end surface of the adjusting shim 6 is attached to the side wall of the U-shaped precast slab 2 to separate the U-shaped precast slab 2 from the circular pipe beam 1 and the supporting shim 5. The adjusting shim 6 is mainly used for adjusting the distance. When the U-shaped precast slab 2 is tightly attached to the circular pipe beam 1 or the supporting shim 5, the position of the U-shaped precast slab 2 cannot be adjusted. Therefore, the adjusting shim 6 is set as a V-shaped structure to separate the U-shaped precast slab 2 from the circular pipe beam 1 and the supporting shim 5, so as to ensure the adjustment effect of the adjusting shim 6 on the U-shaped precast slab 2.

[0038] More preferably, the adjusting pads 6 in this application include multiple pads arranged longitudinally along the circular pipe beam 1. The aforementioned U-shaped precast slabs 2 are also spliced ​​longitudinally, and each U-shaped precast slab 2 has multiple adjusting pads 6 at its lower end, each adjusting pad 6 being adjustable. In actual manufacturing, some areas of the U-shaped precast slab 2 may not meet the set standards in the transverse, longitudinal, or vertical directions. Not every area of ​​the U-shaped precast slab 2 needs adjustment. Therefore, this application provides multiple adjusting pads 6 along the longitudinal direction of the U-shaped precast slab 2. When there are manufacturing or installation deviations in corresponding areas of the U-shaped precast slab 2, the adjusting pads 6 at the corresponding positions are adjusted to ensure that the U-shaped precast slab 2 is in the preset standard position, thus ensuring the overall construction requirements of the maglev pipeline.

[0039] More preferably, cable holes 10 are provided on the side walls of both the circular pipe beam 1 and the U-shaped precast slab 2 in this application. These cable holes 10 are used to connect cables to an external power source. The interior of the circular pipe beam 1 is a vacuum structure, and its internal space is not suitable for a separate power supply. Therefore, external power is required. Cable holes 10 are provided on the circular pipe beam 1 and the U-shaped precast slab 2 to connect the cables to an external power source, thereby powering the magnetic levitation coil. Correspondingly, a proper seal is required at these cable holes 10 to ensure the vacuum inside the pipe.

[0040] More preferably, the circular pipe beam 1 is a multi-hole continuous beam structure, consisting of multiple beams arranged longitudinally. Each circular pipe beam 1 has an end expansion joint 11 at its junction, and an openable sealing door 12 is provided on one side of each end expansion joint 11. The end expansion joint 11 primarily ensures the stable connection of the longitudinally arranged circular pipe beams 1 and maintains the vacuum performance inside the pipe. Simultaneously, the sealing door 12 is mainly used for opening and closing in emergency situations. When the maglev train malfunctions, opening the sealing door 12 connects the internal and external air pressures of the circular pipe beam 1, facilitating the exit of passengers inside the maglev train.

[0041] Furthermore, a pier 13 is also provided below the circular pipe beam 1 in this application. The circular pipe beam 1 in this application is erected and arranged through the pier 13. Since the circular pipe beam 1 in this application has good structural strength and stiffness, and its cross-section has a comparable ability to resist positive and negative bending moments, this application can adopt a continuous beam structure for arrangement. This not only reduces the use of beam end expansion joints 11, but also has better pipe air tightness. Moreover, the continuous beam bridge type is suitable for various construction methods such as support construction, prefabrication assembly, prefabrication erection, rotation, and jacking, and has strong adaptability to the on-site construction environment and strong structural constructability.

[0042] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous pipe beam with a circular composite cross-section, characterized in that, It includes a circular pipe beam integrally arranged in the radial direction, a U-shaped precast slab disposed in the circular pipe beam, and a first slot and a second slot opened on both sides of the U-shaped precast slab in the transverse direction. A magnetic levitation coil is installed in the first slot, and a cable for supplying power to the magnetic levitation coil is installed in the second slot. The bottom of the U-shaped precast slab is provided with two support pads in pairs. The two support pads are separated in the horizontal direction. The two support pads are connected to the bottom surface of the circular pipe beam, and the top surface of the two support pads is horizontal. An adjusting pad is also provided between the U-shaped precast slab and the two supporting pads. The length of the adjusting pad is adjustable in at least one direction, either horizontal, longitudinal, or vertical, so that the U-shaped precast slab is arranged in the circular pipe beam according to the required route. The adjusting pads are cast in place according to a set size. The adjusting pads are V-shaped, with one bottom surface of the adjusting pad attached to the upper surface of the supporting pad, and the other bottom surface of the adjusting pad attached to the inner wall of the circular pipe beam. The upper surface of the adjusting pad is attached to the side wall of the U-shaped precast slab to separate the U-shaped precast slab from the circular pipe beam and the supporting pad. The adjusting pads include a plurality of pads arranged longitudinally along the circular pipe beam, and a plurality of adjusting pads are provided at the lower end of the U-shaped precast slab. Each adjusting pad is adjustable during the construction of the U-shaped precast slab. The main body of the circular pipe beam is a steel-concrete composite structure, and at least one heat-conducting element is connected between the side wall of the U-shaped precast slab and the circular pipe beam. The heat-conducting element forms a heat transfer channel between the U-shaped precast slab and the circular pipe beam. The heat-conducting element is a steel grating plate and is arranged horizontally to form a walking platform. At least one connecting hole is opened vertically on the bottom surface of the U-shaped precast slab, and the connecting hole connects the upper and lower ends of the U-shaped precast slab.

2. The circular composite section continuous pipe beam according to claim 1, characterized in that, Two support rails are also provided in pairs between the two side walls of the U-shaped precast slab, and the two support rails are hollow inside.

3. The circular composite section continuous pipe beam according to claim 1 or 2, characterized in that, Cable holes are provided on the side walls of both the circular pipe beam and the U-shaped precast slab, and the cable holes are used to connect the cable to an external power source.

4. The circular composite section continuous pipe beam according to claim 1 or 2, characterized in that, The circular pipe beam is a multi-hole continuous beam structure, consisting of multiple beams arranged longitudinally. The joints of the multiple circular pipe beams are provided with beam end expansion joints, and an openable and closable sealing door is provided on one side of each beam end expansion joint.

5. The circular composite section continuous pipe beam according to claim 1 or 2, characterized in that, A bridge pier is also provided below the circular pipe beam.

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