CN115158369B - Prestressed concrete vacuum pipeline - Google Patents
Prestressed concrete vacuum pipeline Download PDFInfo
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- CN115158369B CN115158369B CN202210726351.5A CN202210726351A CN115158369B CN 115158369 B CN115158369 B CN 115158369B CN 202210726351 A CN202210726351 A CN 202210726351A CN 115158369 B CN115158369 B CN 115158369B
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- prestressed concrete
- vacuum
- pipeline
- vacuum pipeline
- length direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
- B61B13/00—Other railway systems
- B61B13/10—Tunnel systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L13/00—Electric propulsion for monorail vehicles, suspension vehicles or rack railways; Magnetic suspension or levitation for vehicles
- B60L13/04—Magnetic suspension or levitation for vehicles
Abstract
The application relates to a prestressed concrete vacuum pipeline. The bottom in the existing low-vacuum ultrahigh-speed magnetic levitation pipeline is designed with a longitudinal continuous plane structure as a travelling rail, so that the overall stability is poor, the side wall and the bottom plate of the rail are too thick, and the heat dissipation in the pipeline is not facilitated. The cross section of the application is inverted trapezoid, and comprises a prestressed concrete cavity tubular beam, wherein the outer surface of the prestressed concrete cavity tubular beam is wrapped with a closed structure; vertical concrete side walls are symmetrically arranged on two sides of the inner bottom of the prestressed concrete cavity tubular beam, the concrete side walls are arranged along the length direction of the vacuum pipeline, and electromagnetic coils are arranged on the inner sides of the concrete side walls; a transverse horizontal support is arranged between the outer side of the concrete side wall and the inner side of the corresponding prestressed concrete cavity tubular beam, and the transverse horizontal support is arranged perpendicular to the length direction of the vacuum pipeline. The application combines the closed structure, the tubular beam structure and the track structure into a whole, and the arrangement of the longitudinal, transverse and vertical prestress steel beams increases the longitudinal, transverse and vertical rigidity of the pipeline, has strong heat radiation capability, and the beam manufacturing process is simple, efficient and flexible and has higher popularization value.
Description
Technical Field
The application relates to the technical field of vacuum pipeline magnetic suspension transportation, in particular to a prestressed concrete vacuum pipeline.
Background
For ground traffic, wheeltrack train speeds up to 400km/h have substantially reached the limits of safety and cost. By optimizing it is possible to reach further 500km/h of operating speed (air resistance 92% of total resistance), and once this speed limit is exceeded, vacuum ducts are required to provide a low air pressure environment to reduce air resistance. The car body in the vacuum pipeline is provided with a strong magnet, the track is provided with a magnetic induction coil, strong levitation force and traction force are provided through electromagnetic action, meanwhile, mechanical friction resistance of wheel-rail technology is eliminated, the speed can reach 1000-4000 km/h, the speed is faster, and the energy consumption and the operation cost are lower.
The low-vacuum ultrahigh-speed magnetic levitation pipeline needs to keep the vacuum degree of the long space in the pipeline for a long time, and in order to reduce the energy consumption for maintaining the vacuum state, the sealing requirements of the pipeline structure and the connecting part are extremely high. Because the inside of the pipeline is in an approximate vacuum state, the atmospheric pressure of atmospheric pressure is uniformly distributed on the outer surface of the pipeline in an annular shape, and the huge atmospheric load causes larger tensile stress to be generated on the inner side of the vacuum pipeline.
When the train runs at an ultrahigh speed in the vacuum pipeline, the aerodynamic resistance generated by the thin air in the pipeline is still the main resistance of the train running, the section of the vacuum pipeline can generate a blocking effect under the condition of economy and rationality, so that the air in front of the train is extruded to be heated more when the train runs, and the electromagnetic coil for providing the power of the train can continuously generate heat when the electromagnetic coil works, the convection heat dissipation performance of the thin air in the pipeline is poor, the heat in the pipeline is continuously accumulated, and the temperature is continuously increased.
Strong magnets arranged on two sides of a maglev train body can generate eddy current effect on metal in a certain range along with train operation, and electromagnetic resistance is formed. The wheels and the steel rails are canceled at the bottom of the train, and the strong magnets and the corresponding electromagnetic coils arranged at the two sides of the train body generate vertical, transverse and longitudinal attractive forces and repulsive forces to drive the train to float forward at high speed, so that the vacuum pipeline has the requirement on the longitudinal rigidity of the structure, and meanwhile, the transverse rigidity also needs to meet the requirement on the deformation of the rail, and the vacuum pipeline is greatly different from the traditional rail stress mode.
At present, from the technical data disclosed at home and abroad, the low-vacuum ultra-high-speed magnetic levitation pipeline basically adopts a large-diameter circular tube structure, as shown in fig. 1, or a pipeline structure with a flat bottom and straight wall dome as shown in fig. 2, and the longitudinal continuous plane structure is designed at the bottom of the pipeline as a travelling rail, so that the requirement of structural rigidity can be met while the air tightness of the pipeline is ensured. However, the existing pipeline structure still has the following technical defects:
1. the longitudinal and transverse structural design of the vacuum pipeline steel pipe is not matched with the stress of the pipeline.
When the large-diameter circular pipe structure is adopted, the circular steel pipe outside the vacuum pipeline is of a main bearing structure. Because the steel pipe is a completely symmetrical section, the transverse and vertical bending resistance of the pipeline is basically consistent. When the train runs in the vacuum pipeline, the transverse load is only the horizontal repulsive force of the strong magnets on two sides of the train body, and the vertical load comprises the dead weight of the vacuum pipeline and the running rail, the dead weight of the train, the vertical repulsive force of the strong magnets on two sides of the train body and the like, and is far greater than the transverse load. When the wall thickness of the steel pipe is designed by taking the vertical load as the most control condition, the transverse rigidity is rich, the material strength is not fully utilized, and the structural economy is low.
2. The design of the concrete running rail in the vacuum pipeline also needs to be optimized.
Even if the circular steel tube of the vacuum pipeline is not adopted, the section structure form as shown in fig. 2 is adopted, the travelling rail in the vacuum pipeline is arranged at the middle lower part in the pipeline, the thickness of the side wall and the bottom plate of the rail structure for installing the magnetic resistance coil is not designed according to the actual stress demand, but concrete is directly adopted to completely fill the space between the magnetic resistance coil and the steel tube, the dead weight of the vacuum pipeline structure is increased while the consumption of the concrete is increased, the thickness of the steel tube is further increased, and the cost is increased.
3. The steel tube beam metal material can generate a large amount of eddy current resistance, and has poor operation economy.
The existing vacuum pipeline adopts a steel material which is a strong conductive material as a main bearing structure, and in order to improve the economical efficiency of the pipeline, the cross section of the steel pipe beam can be reduced as much as possible according to the requirements of operation limit and blocking ratio. At this time, the steel pipeline is closer to the strong magnet installed on the train, larger eddy current resistance can be generated when the train runs at a high speed, larger heat can be generated by the magnetic induction coil, and the operation safety and the economy are poor.
4. The side wall and the bottom plate of the concrete running rail are too thick, which is not beneficial to heat dissipation in the pipeline.
A large number of magnetic induction coils are arranged on the side wall and the bottom surface of the concrete travelling rail, and continuously generate heat when power is provided for the running of the vehicle. The side wall and the bottom plate of the existing concrete running rail are directly combined with the steel pipe in a filling mode, and the thickness is large. The concrete material itself heat conductivility is relatively poor, and the heat can't dispel for a long time and lead to coil surface temperature to rise, influences coil material insulating properties and life, and the temperature is constantly accumulated in the pipeline simultaneously, and the steel pipe produces great temperature stress and temperature deformation, influences train operation smoothness and pipeline structure safety in utilization.
5. The existing vacuum pipeline is difficult to construct and transport.
The external steel pipe and the internal concrete running rail of the existing vacuum pipeline are connected in a filling joint mode, and are required to be cast into a whole on site, so that the construction speed is low, and the construction precision and quality are difficult to ensure. The rigidity of the section of the pipeline after construction is extremely unbalanced, the rigidity of the upper steel pipe is weak, the rigidity of the joint part of the lower steel pipe and the concrete is very strong, the structure is extremely easy to overturn and overturn during transportation, lifting and installation, the construction difficulty is high, and the construction protection measures are high in cost.
Disclosure of Invention
The application aims to provide a prestressed concrete vacuum pipeline, which solves the problems that the existing low-vacuum ultrahigh-speed magnetic levitation pipeline is poor in overall stability, excessively thick in track side wall and bottom plate, unfavorable for heat dissipation in the pipeline and the like.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
the vacuum pipeline comprises a prestressed concrete hollow pipe beam, wherein the cross section of the vacuum pipeline is in an inverted trapezoid shape, and a closed structure is wrapped on the outer surface of the prestressed concrete hollow pipe beam;
vertical concrete side walls are symmetrically arranged on two sides of the inner bottom of the prestressed concrete cavity tubular beam, the concrete side walls are arranged along the length direction of the vacuum pipeline, and electromagnetic coils are arranged on the inner sides of the concrete side walls;
a transverse horizontal support is arranged between the outer side of the concrete side wall and the inner side of the corresponding prestressed concrete cavity tubular beam, and the transverse horizontal support is perpendicular to the length direction of the vacuum pipeline.
Further, a fish belly type cross rib structure is arranged at the bottom of the outer surface of the prestressed concrete cavity tubular beam, and the bottom surface of the fish belly type cross rib structure is arc-shaped;
the fish belly type cross rib structures are perpendicular to the length direction of the vacuum pipeline and are arranged at intervals along the length direction of the vacuum pipeline; the outer surface of the fish belly type transverse rib structure is wrapped with a closed structure.
Further, the prestressed concrete cavity tubular beam is divided into a plurality of sections along the length direction of the vacuum pipeline, longitudinal holes which are arranged along the length direction of the vacuum pipeline are formed in the prestressed concrete cavity tubular beam of each section, and longitudinal prestressed steel bundles are arranged in the longitudinal holes of the prestressed concrete cavity tubular beam of the sections in a penetrating manner.
Further, longitudinal holes arranged along the length direction of the vacuum pipeline are formed in the fish belly type transverse rib structures, and longitudinal external prestress steel bundles are arranged in the longitudinal holes of the fish belly type transverse rib structures in a penetrating mode.
Further, a transverse prestress steel beam perpendicular to the length direction of the vacuum pipeline is arranged in the top plate of the prestress concrete cavity pipe beam.
Further, a vertical prestress steel beam perpendicular to the length direction of the vacuum pipeline is arranged in the web plate of the prestress concrete cavity pipe beam.
Further, roof holes are formed in the top plate of the prestressed concrete cavity tubular beam, the roof holes are arranged at intervals along the length direction of the vacuum pipeline, and adjacent roof holes are transversely connected.
Further, web plates of the prestressed concrete cavity tubular beam are provided with web plate holes, and the web plate holes are arranged at intervals along the length direction of the vacuum pipeline.
Further, local thickening areas are arranged at two ends of the bottom of the prestressed concrete cavity tubular beam, and the outer surfaces of the local thickening areas are wrapped with a closed structure.
Further, embedded steel plates are arranged on the outer side of the concrete side wall and the inner side of the corresponding prestressed concrete cavity pipe beam, and are arranged along the length direction of the vacuum pipeline in a through-length mode;
and two ends of the transverse horizontal support are connected to the concrete side wall and the prestressed concrete cavity tubular beam through corresponding embedded steel plates.
Compared with the prior art, the application has the following beneficial effects:
1. the prestressed concrete vacuum pipeline effectively reduces the section size of a track structure, lightens the self weight of the structure under the condition of a certain load, reduces the wall thickness of the structure, reduces the quantity of reinforced concrete, reduces the size of a lower structure and improves the overall engineering economy.
2. The prestressed concrete vacuum pipeline has uniform and continuous beam section shape and material arrangement, effectively improves the condition of unbalanced transverse rigidity of the traditional pipeline, and has uniform structural stress under the influence of atmospheric pressure, load and temperature. Meanwhile, longitudinal, transverse and vertical prestress steel bundles are additionally arranged, so that the structural safety is ensured, the structural size can be further optimized, and the material utilization rate is improved.
3. Aiming at the higher requirement of transverse rigidity of the magnetic levitation track traffic, the fish belly type transverse rib is arranged at the bottom of the prestressed concrete vacuum pipeline, the transverse rigidity of the pipeline is effectively increased according to the structural stress requirement, and the pipeline cross section is reasonable and efficient in design and higher in economical efficiency.
4. According to the prestressed concrete vacuum pipeline, the pipe beam bottom plate is effectively combined with the travelling rail surface, so that the net area of the vacuum pipeline is increased. Therefore, the beam height can be further reduced and the cost of the pipeline beam can be reduced under the condition that the blocking ratio is ensured to meet the requirement.
5. The prestressed concrete vacuum pipeline is of a thin-wall structure, the transverse horizontal support is of a longitudinal discontinuous point-shaped support, heat generated by the electromagnetic coil during operation can be quickly transmitted to the closed structure through the prestressed concrete cavity pipe beam to be emitted to the outside air, the temperature accumulation in the pipeline is reduced, the service life of electromagnetic equipment is prolonged, the hole structure additionally arranged on the pipe beam top plate and the web plate further improves the heat dissipation speed in the pipeline, the economy and the safety of the pipeline are improved, and the problems that a large amount of eddy resistance and poor operation economy are generated by the existing steel pipe beam metal material are overcome.
6. The prestressed concrete vacuum pipeline can directly utilize the existing mature beam making process and equipment, can adopt a factory prefabrication construction method, can also adopt in-situ pouring construction, and has the advantages of simple, efficient and flexible beam making process, and reduced construction difficulty and engineering cost.
7. The section of the prestressed concrete vacuum pipeline is in an inverted trapezoid shape, and compared with the existing vacuum pipeline under the condition that the section area is equivalent to the porosity, the prestressed concrete vacuum pipeline can effectively reduce the height of the pipeline, solves the problems that the existing vacuum pipeline is extremely easy to overturn, overturn and construct during transportation, hoisting and installation, has high construction difficulty and high construction protection measure cost, and has better overall stability of the structure during train operation.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other embodiments of the drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a cross-sectional view of a vacuum pipe having a large diameter circular pipe in the prior art.
FIG. 2 is a cross-sectional view of a prior art vacuum tube having a flat bottom straight wall dome in cross-section.
FIG. 3 is a cross-sectional view of a prestressed concrete vacuum pipe according to example 1 of the present application.
Fig. 4 is a partially enlarged view of the portion where the horizontal support is connected to the side wall of the concrete in example 1 of the present application (a large view of the portion a in fig. 3).
Fig. 5 is a longitudinal sectional view of a prestressed concrete vacuum pipe according to embodiment 1 of the present application.
FIG. 6 is a cross-sectional view showing the arrangement of longitudinal prestressed steel strands of a prestressed concrete vacuum pipe according to example 1 of the present application.
FIG. 7 is a cross-sectional view of a prestressed concrete vacuum pipe according to example 2 of the present application.
FIG. 8 is a cross-sectional view of a prestressed concrete vacuum pipe according to example 3 of the present application.
FIG. 9 is a side view of a prestressed concrete vacuum pipe according to example 3 of the present application.
FIG. 10 is a top view of a prestressed concrete vacuum pipe according to example 3 of the present application.
FIG. 11 is a cross-sectional view showing the arrangement of longitudinal prestressed steel strands of a prestressed concrete vacuum pipe according to example 3 of the present application.
Fig. 12 is a vertical prestress steel strand layout cross-section of a prestress concrete vacuum pipe of embodiment 3 of the application.
FIG. 13 is a cross-sectional view of the transverse prestressed steel bundles of the prestressed concrete vacuum pipe of example 3 of the present application.
FIG. 14 is a cross-sectional view of a prestressed concrete vacuum pipe according to example 4 of the present application.
The marks in the figure are as follows:
the steel plate pre-embedded steel plate comprises a 1-closed structure, a 2-prestressed concrete cavity tubular beam, a 3-concrete side wall, a 4-fish belly type transverse rib structure, a 5-transverse horizontal support, a 6-belly hole, a 7-top plate hole, 8-transverse connection, 9-first longitudinal prestressed steel bundles, 10-second longitudinal prestressed steel bundles, 11-third longitudinal prestressed steel bundles, 12-longitudinal external prestressed steel bundles, 13-transverse prestressed steel bundles, 14-vertical prestressed steel bundles, 15-electromagnetic coils, 16-local thickened areas and 17-pre-embedded steel plates.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of this patent, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "longitudinal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the patent and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the patent. The description of the terms "first," "second," and the like, as used herein, are merely for the purpose of more clearly describing structural features in terms of distinguishing between structures and should not be construed as limiting the relationship, sequence, importance, etc.
In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "disposed," and the like are to be construed broadly and include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.
In the description of the embodiments, the vacuum duct length direction is defined as a longitudinal direction, and the direction perpendicular to the vacuum duct length direction is defined as a transverse direction.
The section of the existing vacuum pipeline structure shown in fig. 1 is circular, and the travelling rail in the vacuum pipeline is arranged at the middle lower part in the pipeline, so that concrete is directly adopted to completely fill the space between the electromagnetic coil and the circular steel pipe, the self weight of the vacuum pipeline structure is increased while the consumption of the concrete is increased, and the cost is increased. In addition, the permeability of the cross section of the structural form is poor, heat dissipation in a pipeline is not facilitated, and the in-situ casting construction difficulty is high. The conventional vacuum pipe structure shown in fig. 2 has a flat bottom straight wall dome as a cross section, and is different from a vacuum pipe structure with a circular cross section in structural stress, but has obvious defects in the aspects of dead weight, cost, permeability, heat dissipation capacity and the like.
In order to overcome the defects, the application provides a prestressed concrete vacuum pipeline which is used as a running vacuum pipeline beam of a maglev train and can replace the prior combined closed circular pipe structure and the semi-concrete semi-steel pipe combined structure by concrete solid blocks. As shown in fig. 3, the cross section of the vacuum pipeline is in an inverted trapezoid shape, and comprises a prestressed concrete cavity tubular beam 2, and a closed structure 1 is wrapped on the outer surface of the prestressed concrete cavity tubular beam 2. The top plate of the prestressed concrete cavity tubular beam 2 is wider, the bottom plate is narrower, webs on two sides are obliquely transited from the top plate to the bottom plate, and the joint parts of the webs and the top plate and the web and the bottom plate are arc-shaped, wherein the joint part of the web and the top plate is larger in thickness, and the stress rigidity of the bending part is improved. The sealing structure 1 and the prestressed concrete cavity tubular beam 2 are tightly sealed and wrapped, a sealing condition is created for the inside of the prestressed concrete cavity tubular beam 2, and the sealing structure 1 is made of materials with good mechanical strength, air tightness, high temperature resistance and corrosion resistance, such as weather-resistant steel, stainless steel, glass fiber, carbon fiber composite materials and the like. Vertical concrete side walls 3 are symmetrically arranged on two sides of the inner bottom of the prestressed concrete cavity tubular beam 2, the concrete side walls 3 are longitudinally arranged along the length direction of the vacuum pipeline, the inner side surface and the outer side surface are mutually parallel and are rectangular in section, and electromagnetic coils 15 are arranged on the inner side of the concrete side walls 3. The bottom plate and the concrete side wall 3 of the prestressed concrete cavity tubular beam 2 form a train running track slab. A transverse horizontal support 5 is arranged between the outer side of the concrete side wall 3 and the inner side of the corresponding prestressed concrete cavity tubular beam 2, and materials with certain material strength such as steel, weather-resistant steel or stainless steel are uniformly arranged along the longitudinal direction of the pipeline. The horizontal supports 5 are transversely arranged perpendicular to the length direction of the vacuum pipeline, are arranged in multiple layers from top to bottom at intervals, are longitudinally and uniformly arranged and are arranged in a dot shape when seen from the side, and the discontinuous dot supports enable the vacuum pipeline to form a hollowed-out area inside, so that heat dissipation in the pipeline is facilitated.
As shown in fig. 3 and 5, in some embodiments, the bottom of the outer surface of the prestressed concrete cavity tubular beam 2 is provided with a fish-bellied cross rib structure 4, and the bottom surface of the fish-bellied cross rib structure 4 is circular arc-shaped, and the front surface and the rear surface are parallel to each other. The fish belly type cross rib structures 4 are perpendicular to the length direction of the vacuum pipeline and are longitudinally arranged at intervals along the length direction of the vacuum pipeline. The fish belly type cross rib structure 4 can be integrally manufactured with the bottom plate of the prestressed concrete cavity tubular beam 2, and a transverse reinforcing support is formed at the bottom of the fish belly type cross rib structure. In order to meet the air tightness requirement of the vacuum tube beam, the outer surface of the fish belly type cross rib structure 4 is also wrapped with a closed structure 1, and the fish belly type cross rib structure and the closed structure 1 of other parts form a complete closed body.
As shown in fig. 6, in some embodiments, the prestressed concrete hollow tubular beam 2 is divided into a plurality of segments along the length direction of the vacuum pipeline, longitudinal holes arranged along the length direction of the vacuum pipeline are formed in the prestressed concrete hollow tubular beam 2 of each segment, and longitudinal prestressed steel bundles are arranged in the longitudinal holes of the prestressed concrete hollow tubular beam 2 of the plurality of segments in a penetrating manner. The longitudinal prestressed steel bundles are arranged in a partitioned mode, a first longitudinal prestressed steel bundle 9 is arranged in the top plate of the prestressed concrete cavity tubular beam 2, a second longitudinal prestressed steel bundle 10 is arranged in the web plate of the prestressed concrete cavity tubular beam 2, and a third longitudinal prestressed steel bundle 11 is arranged in the bottom plate of the prestressed concrete cavity tubular beam 2. In some embodiments, longitudinal holes are also formed in the fish-bellied cross rib structure 4 and are arranged along the length direction of the vacuum pipeline, and longitudinal external prestress steel bundles 12 are arranged in the longitudinal holes of the plurality of fish-bellied cross rib structures 4 in a penetrating manner. In order to meet the requirement of the air tightness of the vacuum tube beam, the closed structure 1 on the outer surface of the fish-bellied cross rib structure 4 wraps the longitudinal external prestress steel beam 12.
As shown in fig. 8, 9, 10 and 14, in some embodiments, top plates of the prestressed concrete cavity tubular beams 2 are provided with top plate holes 7, the top plate holes 7 may be rectangular, four corners are rounded, and the four corners are longitudinally arranged at intervals along the length direction of the vacuum pipeline, and the adjacent top plate holes 7 are transversely connected. Web plate holes 6 are formed in the web plate of the prestressed concrete cavity tubular beam 2, and the web plate holes 6 can be circular and longitudinally arranged at intervals along the length direction of the vacuum pipeline. In order to meet the requirement of the vacuum tube beam on air tightness, the sealing structure is tightly wrapped outside the prestressed concrete cavity tube beam 2, and the sealing structure is also wrapped inside together with the top plate holes 7 and the web plate holes 6. As shown in fig. 12 and 13, in some embodiments, a transverse prestressed steel bundle 13 perpendicular to the length direction of the vacuum pipe is further disposed in the top plate of the prestressed concrete cavity pipe beam 2, and a vertical prestressed steel bundle 14 perpendicular to the length direction of the vacuum pipe is further disposed in the web of the prestressed concrete cavity pipe beam 2. The tensioning anchoring scheme and equipment of the prestressed steel bundles 14 are the same as those of a conventional concrete structure, and the closed structure is only required to be wrapped after the anchor is sealed, so that the air tightness of the tubular beams at the tensioning position is ensured to meet the design requirement. In the embodiment in which roof holes 7 and web holes 6 are provided, transverse prestressed steel bundles 13 and vertical prestressed steel bundles 14 are provided around the roof holes 7 and web holes 6. The top plate holes 7 and the web plate holes 6 can lighten the weight of the prestressed concrete cavity tubular beam 2, and can also be provided with double-layer perspective glass, so that the structural landscape effect is further improved. Reinforcing transverse and vertical steel bundles are required to be arranged near the holes so as to ensure that the transverse and vertical rigidity of the hole parts meets the structural design requirement.
In some embodiments, as shown in fig. 7 and 14, local thickened areas 16 are arranged at two ends of the bottom of the prestressed concrete cavity tubular beam 2, and the outer surface of each local thickened area 16 is wrapped with a closed structure 1, so that a complete closed body is formed by the closed structure 1 of other parts. The prestressed concrete cavity tubular beam 2 is of a concrete thin-wall tubular structure, the cross section of the prestressed concrete cavity tubular beam is of an inverted trapezoid, and arc or bevel chamfer transition is arranged at the corner of the cross section. Considering the space for setting the support at the beam end, the local thickened area 16 of the bottom plate is arranged at the longitudinal end part of the prestressed concrete cavity tubular beam 2, and the setting range can meet the installation space of the support.
As shown in fig. 4, the outside of the concrete side wall 3 and the inside of the corresponding prestressed concrete cavity tubular beam 2 are both provided with embedded steel plates 17, and the embedded steel plates 17 are arranged along the length direction of the vacuum pipeline. The two ends of the transverse horizontal support 5 are connected to the concrete side wall 3 and the prestressed concrete cavity tubular beam 2 through corresponding embedded steel plates 17, and can be connected in a welding mode or the like.
Example 1:
as shown in fig. 3-6, in this embodiment, the prestressed concrete cavity tubular beam 2 is a complete structure with closed and non-perforated holes, two ends of the top plate and two ends of the bottom plate are arc-shaped, the bottom plate is provided with a fish belly type transverse rib structure 4, a first longitudinal prestressed steel beam 9, a second longitudinal prestressed steel beam 10 and a third longitudinal prestressed steel beam 11 are arranged in the prestressed concrete cavity tubular beam 2, a longitudinal external prestressed steel beam 12 is arranged in the fish belly type transverse rib structure 4, and the closed structure 1 is wrapped outside the prestressed concrete cavity tubular beam 2, the fish belly type transverse rib structure 4 and the longitudinal external prestressed steel beam 12. The transverse horizontal support 5 is provided with three layers from top to bottom, and the length of the transverse horizontal support is gradually shortened from top to bottom.
Example 2:
as shown in fig. 7, the difference between the present embodiment and embodiment 1 is that local thickened areas 16 are provided at two ends of the bottom plate of the prestressed concrete cavity tubular beam 2, and the enclosed structure 1 is wrapped outside the prestressed concrete cavity tubular beam 2, the fish belly type cross rib structures 4, the longitudinal external prestressed steel bundles 12 and the local thickened areas 16.
Example 3:
as shown in fig. 8-13, the difference between this embodiment and embodiment 1 is that the prestressed concrete hollow tubular girder 2 is provided with a top plate hole 7 and a web hole 6, a first longitudinal prestressed steel bundle 9 is arranged between the top plate hole 7 and the web hole 6, a second longitudinal prestressed steel bundle 10 is arranged below the web hole 6, and a third longitudinal prestressed steel bundle 11 is arranged at the bottom plate. Transverse prestressed steel bundles 13 are arranged on the transverse connection 8 and vertical prestressed steel bundles 14 are arranged between adjacent web holes 6.
Example 4:
as shown in fig. 14, the difference between this embodiment and embodiment 3 is that local thickened areas 16 are provided at both ends of the bottom plate of the prestressed concrete hollow tubular girder 2.
The prestressed concrete vacuum pipeline combines the closed structure, the tubular beam structure and the track structure into a whole, has definite functions of each structure, clear force transmission path and simple tubular beam structure, and effectively reduces the weight of the whole hole beam; the longitudinal, transverse and vertical rigidity of the pipeline is increased by arranging the longitudinal, transverse and vertical prestress steel bundles, the material strength is fully exerted, and the application range of the concrete material in the field of ultra-high-speed magnetic levitation type rail transit is further expanded; the concrete thin-wall section form enhances the heat dissipation capacity of the pipeline, reduces the temperature accumulation in the pipeline and prolongs the service life of electromagnetic equipment; the existing mature beam making process and equipment can be directly utilized, a factory prefabrication construction method can be adopted, and in-situ pouring construction can also be adopted, so that the beam making process is simple, efficient and flexible, and the construction difficulty and the construction cost are reduced.
The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the application pertains, based on the idea of the application.
Claims (10)
1. The prestressed concrete vacuum pipeline is characterized in that:
the cross section of the vacuum pipeline is inverted trapezoid, the vacuum pipeline comprises a prestressed concrete cavity pipe beam (2), and a closed structure (1) is wrapped on the outer surface of the prestressed concrete cavity pipe beam (2);
vertical concrete side walls (3) are symmetrically arranged on two sides of the inner bottom of the prestressed concrete cavity tubular beam (2), the concrete side walls (3) are arranged along the length direction of the vacuum pipeline, and electromagnetic coils (15) are arranged on the inner sides of the concrete side walls (3);
a transverse horizontal support (5) is arranged between the outer side of the concrete side wall (3) and the inner side of the corresponding prestressed concrete cavity tube beam (2), and the transverse horizontal support (5) is perpendicular to the length direction of the vacuum pipeline.
2. The prestressed concrete vacuum pipe of claim 1, wherein:
the bottom of the outer surface of the prestressed concrete cavity tubular beam (2) is provided with a fish-bellied cross rib structure (4), and the bottom surface of the fish-bellied cross rib structure (4) is arc-shaped;
the fish belly type cross rib structures (4) are perpendicular to the length direction of the vacuum pipeline and are arranged at intervals along the length direction of the vacuum pipeline; the outer surface of the fish belly type transverse rib structure (4) is wrapped with a closed structure (1).
3. The prestressed concrete vacuum pipe of claim 1, wherein:
the prestressed concrete cavity tubular beam (2) is divided into a plurality of sections along the length direction of the vacuum pipeline, longitudinal holes which are arranged along the length direction of the vacuum pipeline are formed in the prestressed concrete cavity tubular beam (2) of each section, and longitudinal prestressed steel bundles are arranged in the longitudinal holes of the prestressed concrete cavity tubular beam (2) of the plurality of sections in a penetrating mode.
4. The prestressed concrete vacuum pipe of claim 2, wherein:
longitudinal holes arranged in the length direction of the vacuum pipeline are formed in the fish belly type transverse rib structures (4), and longitudinal external prestress steel bundles (12) are arranged in the longitudinal holes of the fish belly type transverse rib structures (4) in a penetrating mode.
5. The prestressed concrete vacuum pipe of claim 1, wherein:
and a transverse prestress steel beam (13) perpendicular to the length direction of the vacuum pipeline is arranged in the top plate of the prestressed concrete cavity tubular beam (2).
6. The prestressed concrete vacuum pipe of claim 1, wherein:
a vertical prestress steel beam (14) perpendicular to the length direction of the vacuum pipeline is arranged in a web plate of the prestress concrete cavity pipe beam (2).
7. The prestressed concrete vacuum pipe of claim 1, wherein:
roof hole (7) have been seted up to the roof of prestressed concrete cavity tubular beam (2), roof hole (7) are followed vacuum pipeline length direction interval arrangement, adjacent be transverse connection between roof hole (7).
8. The prestressed concrete vacuum pipe of claim 1, wherein:
web plate holes (6) are formed in the web plate of the prestressed concrete cavity tubular beam (2), and the web plate holes (6) are arranged at intervals along the length direction of the vacuum pipeline.
9. The prestressed concrete vacuum pipe of claim 1, wherein:
local thickening areas (16) are arranged at two ends of the bottom of the prestressed concrete cavity tubular beam (2), and a closed structure (1) is wrapped on the outer surface of each local thickening area (16).
10. The prestressed concrete vacuum pipe of claim 1, wherein:
the outside of the concrete side wall (3) and the inside of the corresponding prestressed concrete cavity tube beam (2) are respectively provided with an embedded steel plate (17), and the embedded steel plates (17) are arranged along the length direction of the vacuum pipeline in a through-length way;
two ends of the transverse horizontal support (5) are connected to the concrete side wall (3) and the prestressed concrete cavity tubular beam (2) through corresponding embedded steel plates (17).
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| CN202210726351.5A CN115158369B (en) | 2022-06-24 | 2022-06-24 | Prestressed concrete vacuum pipeline |
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| CN202210726351.5A CN115158369B (en) | 2022-06-24 | 2022-06-24 | Prestressed concrete vacuum pipeline |
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| CN115158369B true CN115158369B (en) | 2023-08-29 |
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