Beam structure and construction method thereof

Abstract

The application provides a beam part structure, which comprises a plurality of U-shaped beams, a plurality of n-shaped steel pipes, outer steel plates, a plurality of annular stiffening ribs and a plurality of sets of connecting devices; the plurality of U-shaped beams are spliced with each other along the extending direction of the bridge, and the outer surfaces of each U-shaped beam are provided with outer steel plates; the plurality of n-shaped steel pipes are spliced with each other along the extending direction of the bridge, and each n-shaped steel pipe is correspondingly arranged above each U-shaped beam, the downward two ends of the n-shaped steel pipe are respectively butted with the upward two ends of the outer steel plates of the outer surfaces of the U-shaped beams, and are fixedly connected through the plurality of sets of connecting devices; and the plurality of annular stiffening ribs are arranged on the outer surfaces of the n-shaped steel pipes in a spaced mode. The application can simultaneously meet the stress requirement and the sealing requirement of the structure, and a plurality of processes such as pouring of sealing materials are omitted, the construction difficulty is effectively reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to a beam structure and its construction method. Background Technology

[0002] Vacuum tube high-speed transportation is an emerging field, and currently, the beam structures of various vacuum tube high-speed transportation bridges are all in the theoretical research and development stage, with no practical engineering applications yet. In existing technologies, beams with a full circular tube cross-section can only be erected via underground transport, making installation impossible when encountering ground obstacles such as rivers. Furthermore, most proposed split beam structures employ separate design schemes for load-bearing connections and sealing structures (e.g., sealing with epoxy resin after completing the load-bearing connections). This connection and sealing method is complex and yields poor sealing results, leading to complex construction and susceptibility to external environmental factors such as weather and temperature. Epoxy resin sealing also presents durability issues; with changes in sunlight and ambient temperature in outdoor environments, epoxy resin exhibits significant aging and cracking, thus affecting sealing performance.

[0003] In summary, since the beam structure of the vacuum tube high-speed transportation bridge in the prior art has the above-mentioned shortcomings, how to propose a better beam structure and its construction method to overcome the above shortcomings is an urgent problem to be solved in this field. Summary of the Invention

[0004] In view of this, the present invention provides a beam structure and its construction method, which can simultaneously meet the structural stress requirements and sealing requirements, eliminate multiple processes such as grouting sealing materials, effectively reduce construction difficulty and improve construction efficiency.

[0005] The technical solution of this invention is implemented as follows:

[0006] A beam structure includes: multiple U-shaped beams, multiple n-shaped steel pipes, an outer steel plate, multiple annular stiffening ribs, and multiple sets of connecting devices;

[0007] The multiple U-shaped beams are spliced ​​together along the extension direction of the bridge, and each U-shaped beam has an outer steel plate on its outer surface.

[0008] The multiple n-shaped steel pipes are spliced ​​together along the extension direction of the bridge, and each n-shaped steel pipe is respectively set above each U-shaped beam. The downward ends of the n-shaped steel pipes are respectively connected to the upward ends of the outer steel plate on the outer surface of the U-shaped beam, and are fixedly connected by multiple sets of connecting devices.

[0009] The multiple annular stiffening ribs are spaced apart on the outer surface of each n-shaped steel pipe section.

[0010] Preferably, each set of connecting devices includes two symmetrically arranged connecting devices, and each connecting device further includes: a connecting plate and a fixing plate;

[0011] The connecting plate is vertically fixed to the outer side wall of the top of the outer steel plate, and the height of the connecting plate is higher than the top of the outer steel plate. The top of the connecting plate is connected to the annular stiffening rib.

[0012] The fixing plate is vertically fixed to the inner side wall of the top of the outer steel plate and is arranged opposite to the connecting plate, with the top of the fixing plate flush with the top of the connecting plate.

[0013] On the sides of the fixing plate and the connecting plate opposite each other, there are corresponding notches at the positions corresponding to the top of the outer steel plate, which match to form mounting holes.

[0014] Preferably, the inner side of the top of the fixing plate is provided with a notch.

[0015] Preferably, a plurality of shear studs are provided on the inner sidewall of the outer steel plate and are disposed within the beam body of the U-shaped beam.

[0016] Preferably, the inner side of the U-shaped beam is provided with low-magnetic steel bars, and the outer side of the U-shaped beam is provided with conventional hot-rolled steel bars.

[0017] Preferably, each U-shaped beam has multiple symmetrical pre-drilled holes at the bottom bend of a preset position for hoisting the U-shaped beam.

[0018] Preferably, at a predetermined position on the U-shaped beam, a transverse conduit for cable installation is provided at the bottom of the U-shaped beam, and a vacuum flange is provided at the end of the conduit.

[0019] Preferably, two adjacent n-shaped steel pipes and two adjacent U-shaped beams are sealed and connected by the same corrugated pipe.

[0020] A construction method for a beam structure includes the following steps:

[0021] Step A: Transport the U-shaped beam to the pre-designated bridge pier;

[0022] Step B: Erect the U-shaped beam;

[0023] Step C: Install n-shaped steel pipes on the U-shaped beam;

[0024] Step D: Splice two adjacent U-shaped beams and two adjacent n-shaped steel pipes.

[0025] Preferably, a temporary support frame is set on the top of the n-shaped steel pipe. After the U-shaped beam is erected and assembled, a transport vehicle for transporting the n-shaped steel pipe is placed on the constructed U-shaped beam. The transport vehicle is equipped with a lifting frame. The processed n-shaped steel pipe is transported to the pre-positioned transport vehicle on the U-shaped beam using a gantry crane. The temporary support frame is set on the roof of the transport vehicle. The transport vehicle is used to transport the n-shaped steel pipe to the corresponding position on the corresponding U-shaped beam.

[0026] As can be seen above, in the technical solution of this invention, by directly connecting the outer steel plate of the beam structure to the n-shaped steel pipe, the structural stress requirements and sealing requirements can be met simultaneously, eliminating multiple processes such as grouting sealing materials, effectively reducing construction difficulty and improving construction efficiency. Furthermore, since there is no need to use sealing materials such as epoxy resin, it is less affected by weather, temperature, etc., further ensuring the quality of connection and sealing. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of the beam structure in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the cross-section of the n-shaped steel pipe in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the connection device in an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the connection device in an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram showing the distribution of shear studs on the outer steel plate in an embodiment of the present invention.

[0032] Figure 6 This is a schematic cross-sectional view of the U-shaped beam in an embodiment of the present invention.

[0033] Figure 7 This is a cross-sectional schematic diagram of the pre-drilled hole on the U-shaped beam in an embodiment of the present invention.

[0034] Figure 8 This is a top view of the U-shaped beam in an embodiment of the present invention.

[0035] Figure 9 This is a schematic diagram of the pipe on the U-shaped beam in an embodiment of the present invention.

[0036] Figure 10 This is a flowchart of the construction method for the beam structure in an embodiment of the present invention.

[0037] Figure 11 This is a schematic diagram of the transportation of the n-shaped steel pipe in an embodiment of the present invention. Detailed Implementation

[0038] To make the 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 specific embodiments.

[0039] like Figures 1 to 9 As shown, the present invention provides a beam structure, including: multiple U-shaped beams 1, multiple n-shaped steel pipes 2, outer steel plates 11, multiple annular stiffening ribs 21, and multiple sets of connecting devices;

[0040] The multiple U-shaped beams 1 are spliced ​​together along the extension direction of the bridge, and each U-shaped beam 1 has an outer steel plate 11 on its outer surface.

[0041] The multiple n-shaped steel pipes 2 are spliced ​​together along the extension direction of the bridge, and each n-shaped steel pipe 2 is respectively set above each U-shaped beam 1. The downward ends of the n-shaped steel pipes 2 are respectively connected to the upward ends of the outer steel plate 11 on the outer surface of the U-shaped beam 1, and are fixedly connected by multiple sets of connecting devices.

[0042] The plurality of annular stiffening ribs 21 are spaced apart on the outer surface of each n-shaped steel pipe 2.

[0043] In the technical solution of this invention, the upper part uses an n-shaped steel pipe, and the lower part uses a U-shaped beam structure to form a tube beam capable of withstanding train loads. By setting an outer steel plate on the outer surface of the U-shaped beam, the airtightness of the vacuum environment inside the tube beam can be achieved. The two ends of the n-shaped steel pipe are directly butted and fixed to the two ends of the outer steel plate, thereby simultaneously meeting the structural stress requirements and sealing requirements, eliminating multiple processes such as grouting sealing materials, effectively reducing construction difficulty and improving construction efficiency. Moreover, since there is no need to use sealing materials such as epoxy resin, it is less affected by weather, temperature, etc., further ensuring the quality of connection and sealing.

[0044] Furthermore, multiple annular stiffening ribs are spaced apart on the outer side of the pipe wall. These annular stiffening ribs are fixedly connected to the steel pipe wall to form a whole, thereby improving the ability of the n-shaped steel pipe wall to resist internal and external loads. Placing the annular stiffening ribs on the outer wall of the pipe beam, rather than the inner wall, effectively avoids the air resistance effect caused by the annular stiffening ribs when vehicles are running at high speeds. Using annular stiffening ribs instead of longitudinal (along the bridge extension direction) stiffening ribs avoids the impact of external environmental factors such as dust and snow accumulation, reducing maintenance workload and lightening the load on the bridge.

[0045] In the technical solution of this invention, various implementation methods can be used to realize the above-mentioned beam structure. The following will describe in detail one of the implementation methods as an example.

[0046] For example, preferably, in one specific embodiment of the invention, such as Figure 3 and Figure 4 As shown, each set of connecting devices may include two symmetrically arranged connecting devices, and each connecting device may further include: a connecting plate 5 and a fixing plate 4;

[0047] The connecting plate 5 is vertically fixed to the outer side wall of the top of the outer steel plate, and the height of the connecting plate 5 is higher than the top of the outer steel plate. The top of the connecting plate 5 is connected to the annular stiffening rib 21.

[0048] The fixing plate 4 is vertically fixed to the inner side wall of the top of the outer steel plate and is opposite to the connecting plate 5, with the top of the fixing plate 4 and the connecting plate 5 being flush.

[0049] On the side of the fixing plate 4 opposite to the connecting plate 5, there are corresponding notches at the positions corresponding to the top of the outer steel plate, which match to form mounting holes 6.

[0050] In the technical solution of this invention, the height of both ends of the outer steel plate can be higher than the height of both ends of the U-shaped beam 1, so that a connecting device can be set at the part of the outer steel plate that is higher than the U-shaped beam 1, which facilitates the connection between the outer steel plate and the n-shaped steel pipe. Since the connecting plate 5 of the connecting device is set on the outer side wall of the outer steel plate, and the fixing plate is set on the inner side wall of the outer steel plate, and the height of the connecting plate 5 and the fixing plate 4 is higher than the top of the outer steel plate, a gap groove can be formed at the top between the connecting plate 5 and the fixing plate 4. When the n-shaped steel pipe is installed above the U-shaped beam 1, the two downward ends of the n-shaped steel pipe can be inserted into the gap groove formed between the connecting plate 5 and the fixing plate 4 of each set of connecting devices, so that the bottom end of the n-shaped steel pipe and the top end of the U-shaped beam are connected in the gap groove, and the top end of the connecting plate 5 is connected to the bottom end of the annular stiffening rib 21, making the positioning and installation of the n-shaped steel and the U-shaped beam simpler and faster.

[0051] In addition, the heights of the connecting plate 5 and the fixing plate 4 are both higher than the top of the outer steel plate, and the mounting holes 6 are set at the positions corresponding to the top of the outer steel plate. The mounting holes 6 not only provide sufficient operating space for the connection construction between the n-shaped steel pipe 2 and the U-shaped beam 1, but also prevent the connection seams between the connecting plate 5 and the fixing plate 4 and the outer steel plate 11, as well as the connection seams between the fixing plate and the annular stiffening rib, from intersecting with the connection seams between the n-shaped steel pipe 2 and the U-shaped beam 1, thereby reducing the residual stress of the structure.

[0052] Preferably, in one specific embodiment of the present invention, such as Figure 3 and Figure 4 As shown, a notch 41 can be provided on the inner side of the top of the fixing plate 4. By providing the notch 41, the opening at the top of the slot formed between the connecting plate 5 and the fixing plate 4 can be enlarged, making it easier for the two downward ends of the n-shaped steel pipe to be inserted into the slot, thus facilitating the installation of the n-shaped steel pipe 2.

[0053] In the technical solution of this invention, after the n-shaped steel pipe 2 is installed in place and fixedly connected to the U-shaped beam 1, the top end of the connecting plate 5 can be connected to the bottom end of the annular stiffening rib 21, and the upper part of the inner side of the connecting plate can also be fixedly connected to the outer wall of the n-shaped steel pipe. This not only directly fixes the n-shaped steel pipe 2 to the U-shaped beam 1, but also, through the connecting plate 5, fixes it to the outer wall of the U-shaped beam 1 and the n-shaped steel pipe, as well as the annular stiffening rib, further strengthening the connection between the U-shaped beam and the n-shaped steel pipe, making them a unified whole. Furthermore, after the n-shaped steel pipe is installed, the fixing plate 4 can be removed, thereby reducing the space occupied inside the pipe beam.

[0054] Preferably, as an example, the n-shaped steel pipe 2 and the U-shaped beam 1 can be fixed by welding, which can not only ensure the reliability of the connection between the n-shaped steel pipe 2 and the U-shaped beam 1, but also ensure the airtight sealing quality of the connection position, thereby improving reliability.

[0055] Preferably, as an example, the connecting plate 5 can be fixed to the outer walls of the U-shaped beam 1 and the n-shaped steel pipe 2, as well as the annular stiffening rib, by welding.

[0056] For example, preferably, in a specific embodiment of the present invention, such as Figure 5 As shown, multiple shear studs are provided on the inner sidewall of the outer steel plate 11 and are installed in the beam body of the U-shaped beam, thereby strengthening the connection strength between the outer steel plate and the U-shaped beam.

[0057] Furthermore, as an example, in a preferred embodiment of the invention, such as Figure 6 As shown, the inner side of the U-shaped beam 1 is provided with low magnetic steel bars 13, while the outer side of the U-shaped beam 1 is provided with conventional hot-rolled steel bars 14.

[0058] In the technical solution of this invention, to improve the strength of the U-shaped beam, steel bars are placed inside the beam body before concrete is poured. However, when the high-speed maglev vehicle runs inside the vacuum tube beam, the steel bars inside the tube beam will generate magnetic resistance on the vehicle, which will reduce the vehicle's speed. Therefore, low-magnetic steel bars 13 are placed inside the beam body on the inner side of the U-shaped beam 1. Since the low-magnetic steel bars have low magnetic permeability, the impact of magnetic resistance on vehicle operation can be reduced. The steel bars on the outer side of the U-shaped beam 1 have less impact on the vehicle, so conventional hot-rolled steel bars 14 can be placed inside the beam body on the outer side of the U-shaped beam 1 to meet the strength requirements of the U-shaped beam.

[0059] Furthermore, as an example, in a preferred embodiment of the present invention, the intersection of the low magnetic steel bar 13 and / or the conventional hot-rolled steel bar 14 can be insulated with an insulating plastic tube or insulating clip, thereby avoiding the formation of a current loop at the steel bar intersection and increasing the magnetic resistance.

[0060] Additionally, as an example, in a preferred embodiment of the invention, such as Figure 7 and Figure 8 As shown, multiple symmetrical pre-drilled holes 15 can be provided at the bottom bend of each U-shaped beam 1 at a preset position for hoisting the U-shaped beam.

[0061] In the technical solution of the present invention, by setting multiple reserved holes on the U-shaped beam, the lifting steel bar on the lifting equipment can pass through the reserved holes 15 on the U-shaped beam, and the lifting equipment can lift the U-shaped beam vertically, thereby realizing the transportation of the U-shaped beam to the designated position. Since multiple reserved holes limit the movement at the same time, the horizontal movement, horizontal rotation or overturning of the U-shaped beam is avoided, ensuring the safety of the transportation and installation process of the U-shaped beam.

[0062] Additionally, as an example, in a preferred embodiment of the invention, such as Figure 9 As shown, at a preset position on the U-shaped beam 1, a transverse pipe 16 for installing cables can be provided at the bottom of the U-shaped beam 1, and a vacuum flange 7 is provided at the end of the pipe 16.

[0063] In order to allow the entry or exit of communication signal and power supply cables inside the tube beam while meeting the vacuum sealing conditions, a pipe 16 can be installed at the bottom of the U-shaped beam 1, and a vacuum flange can be installed at the end of the pipe 16, so as to achieve both the airtightness of the vacuum environment and the circuit connection.

[0064] Furthermore, as an example, in a preferred embodiment of the present invention, two adjacent n-shaped steel pipes and two adjacent U-shaped beams can be sealed and connected by the same corrugated pipe.

[0065] Preferably, as an example, the corrugated pipe can be an annular structure made of metal material and can be fixedly connected to the n-shaped steel pipe and the U-shaped beam by welding.

[0066] Since each segment of the n-shaped steel pipe is positioned above a corresponding segment of the U-shaped beam, the joint positions of adjacent U-shaped beams and adjacent n-shaped steel pipes are identical. Therefore, by installing annular corrugated pipes at the joint positions, adjacent U-shaped beams and adjacent n-shaped steel pipes can be sealed together. Connecting adjacent pipe segments via corrugated pipes also allows the pipes to function as expansion joints, enabling the bridge to freely expand and contract longitudinally under temperature variations while maintaining a sealed vacuum environment inside the pipe beam.

[0067] As can be seen from the above, in the technical solution of this invention, by directly connecting the outer steel plate of the beam structure to the n-shaped steel pipe, the structural stress requirements and sealing requirements can be met simultaneously, eliminating multiple processes such as grouting sealing materials, effectively reducing construction difficulty and improving construction efficiency. Moreover, since there is no need to use sealing materials such as epoxy resin, it is less affected by weather, temperature, etc., further ensuring the quality of connection and sealing.

[0068] According to the beam structure provided by the present invention, the present invention also provides a corresponding construction method, for details please refer to [link / reference needed]. Figure 10 .

[0069] Figure 10 This is a flowchart of the construction method for the beam structure in an embodiment of the present invention.

[0070] like Figure 10 As shown, the construction method may include the following steps:

[0071] Step 101: Transport the U-shaped beam to the pre-designated bridge pier;

[0072] In addition, in the technical solution of the present invention, before step 101, it may further include: constructing foundation structures such as bridge piers, and prefabricating U-shaped beams on site.

[0073] Preferably, as an example, a gantry crane can be used to transport the U-shaped beam. The lifting steel bar on the gantry crane is passed through the reserved hole 15 on the U-shaped beam and fixed. The gantry crane is then started to transport the U-shaped beam to the preset pier.

[0074] Step 102: Erect the U-shaped beam;

[0075] After the U-shaped beams are transported to the bridge piers by a gantry crane, each section of the U-shaped beam can be erected to the accurate position by a bridge erecting machine.

[0076] Step 103: Install n-shaped steel pipes on the U-shaped beam;

[0077] In addition, in the technical solution of the present invention, before step 103, it may further include: processing an n-shaped steel pipe;

[0078] Preferably, in a specific embodiment of the present invention, such as Figure 11 As shown, a temporary support frame can be set on the top of the n-shaped steel pipe. After the U-shaped beam is erected and assembled, a transport vehicle for transporting the n-shaped steel pipe can be placed on the constructed U-shaped beam. The transport vehicle is equipped with a lifting frame. Then, a gantry crane can be used to transport the processed n-shaped steel pipe to the transport vehicle pre-positioned on the U-shaped beam, so that the temporary support frame is erected on the roof of the transport vehicle. The transport vehicle is used to transport the n-shaped steel pipe to the corresponding position on the corresponding U-shaped beam.

[0079] Preferably, as an example, a cross brace can be installed on the inside of the n-shaped steel pipe, with telescopic tie rods on both sides of the n-shaped steel pipe. After the n-shaped steel pipe is delivered to the designated location, the lifting frame and telescopic tie rods on the transport vehicle are adjusted so that the downward ends of the n-shaped steel pipe are inserted into the slots of the connecting device, and the n-shaped steel pipe is fixedly connected to the U-shaped beam.

[0080] Furthermore, as an example, in a specific embodiment of the present invention, n-shaped steel pipes can be installed sequentially starting from the initial segment of the U-shaped beam.

[0081] For example, a transport vehicle delivers the first section of n-shaped steel pipe to the beginning of the U-shaped beam after it has been erected, and places the n-shaped steel pipe on the first section of the U-shaped beam. After installation, the transport vehicle then delivers the second section of n-shaped steel pipe to the second section of the U-shaped beam, places it on the second section of the U-shaped beam, and so on, starting from the beginning of the U-shaped beam and installing the n-shaped steel pipes in sequence.

[0082] Preferably, as an example, after each section of the n-shaped steel pipe is installed and secured, the telescopic tie rod on that section of the n-shaped steel pipe can be removed, the lifting frame can be adjusted and removed from the transport vehicle, and the temporary support frame and the corresponding fixing plate 4 can be removed.

[0083] Step 104: Splice two adjacent U-shaped beams and two adjacent n-shaped steel pipes.

[0084] Preferably, as an example, a corrugated pipe can be installed between two adjacent U-shaped beams and n-shaped steel pipes to seal the connection between the two adjacent U-shaped beams and n-shaped steel pipes.

[0085] Furthermore, as an example, in a preferred embodiment of the present invention, after step 104, the bridge deck system structure can be further constructed to complete the construction of the entire bridge.

[0086] In summary, the technical solution of this invention, through the rational design of the beam structure and its construction scheme, simultaneously satisfies the structural stress and sealing requirements, eliminating multiple processes such as grouting sealing materials, effectively reducing construction difficulty and improving construction efficiency. Furthermore, since there is no need to use sealing materials such as epoxy resin, it is less susceptible to the effects of weather and temperature, further ensuring the quality of connection and sealing.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., 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 beam structure, characterized in that, include: Multiple U-shaped beams, multiple n-shaped steel pipes, outer steel plates, multiple annular stiffening ribs, and multiple sets of connecting devices; The multiple U-shaped beams are spliced ​​together along the extension direction of the bridge, and each U-shaped beam has an outer steel plate on its outer surface. The multiple n-shaped steel pipes are spliced ​​together along the extension direction of the bridge, and each n-shaped steel pipe is respectively set above each U-shaped beam. The downward ends of the n-shaped steel pipes are respectively connected to the upward ends of the outer steel plate on the outer surface of the U-shaped beam, and are fixedly connected by multiple sets of connecting devices. The multiple annular stiffening ribs are spaced apart on the outer surface of each n-shaped steel pipe section. Each set of connecting devices includes two symmetrically arranged connecting devices, and each connecting device further includes: a connecting plate and a fixing plate; The connecting plate is vertically fixed to the outer side wall of the top of the outer steel plate, and the height of the connecting plate is higher than the top of the outer steel plate. The top of the connecting plate is connected to the annular stiffening rib. The fixing plate is vertically fixed to the inner side wall of the top of the outer steel plate and is arranged opposite to the connecting plate, with the top of the fixing plate flush with the top of the connecting plate. On the sides of the fixing plate and the connecting plate opposite each other, there are corresponding notches at positions corresponding to the top of the outer steel plate, which match to form mounting holes; The height of both ends of the outer steel plate is higher than the height of both ends of the U-shaped beam.

2. The beam structure according to claim 1, characterized in that, The inner side of the top of the fixing plate is provided with a notch.

3. The beam structure according to claim 1, characterized in that, Multiple shear studs are provided on the inner wall of the outer steel plate and are installed within the U-shaped beam.

4. The beam structure according to claim 1, characterized in that, The inner side of the U-shaped beam contains low-magnetic steel bars, while the outer side contains conventional hot-rolled steel bars.

5. The beam structure according to claim 1, characterized in that, Each U-shaped beam has multiple symmetrical pre-drilled holes at the bottom bends of its pre-set positions for hoisting the U-shaped beam.

6. The beam structure according to claim 1, characterized in that, At a predetermined position on the U-shaped beam, a horizontal conduit for cable installation is provided at the bottom of the U-shaped beam, and a vacuum flange is provided at the end of the conduit.

7. The beam structure according to claim 1, characterized in that, The two adjacent n-shaped steel pipes and the two adjacent U-shaped beams are sealed and connected by the same corrugated pipe.

8. A construction method for a beam structure according to any one of claims 1 to 7, characterized in that, Includes the following steps: Step A: Transport the U-shaped beam to the pre-designated bridge pier; Step B: Erect the U-shaped beam; Step C: Install n-shaped steel pipes on the U-shaped beam; Step D: Splice two adjacent U-shaped beams and two adjacent n-shaped steel pipes.

9. The construction method according to claim 8, characterized in that, Temporary supports are set up on top of the n-shaped steel pipes. After the U-shaped beams are erected and assembled, a transport vehicle for transporting the n-shaped steel pipes is placed on the constructed U-shaped beams. The transport vehicle is equipped with a lifting frame. The processed n-shaped steel pipes are transported to the transport vehicle pre-positioned on the U-shaped beam using a gantry crane. Temporary supports are set up on the roof of the transport vehicle. The transport vehicle is used to transport the n-shaped steel pipes to the corresponding positions on the corresponding U-shaped beams.

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