CN113957755A - Medium-low speed magnetic levitation traffic combined U-shaped beam structure - Google Patents
Medium-low speed magnetic levitation traffic combined U-shaped beam structure Download PDFInfo
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- CN113957755A CN113957755A CN202111119829.XA CN202111119829A CN113957755A CN 113957755 A CN113957755 A CN 113957755A CN 202111119829 A CN202111119829 A CN 202111119829A CN 113957755 A CN113957755 A CN 113957755A
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- 238000005339 levitation Methods 0.000 title claims description 25
- 238000010276 construction Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000009417 prefabrication Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000002411 adverse Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 11
- 239000000725 suspension Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/30—Tracks for magnetic suspension or levitation vehicles
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/30—Tracks for magnetic suspension or levitation vehicles
- E01B25/305—Rails or supporting constructions
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D18/00—Bridges specially adapted for particular applications or functions not provided for elsewhere, e.g. aqueducts, bridges for supporting pipe-lines
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
A combined U-shaped beam structure of medium-low speed maglev traffic is provided, which can effectively reduce the height of a bridge, improve the landscape of the bridge, facilitate transportation, erection and construction, facilitate operation and maintenance and improve adverse influence of temperature on the premise of meeting the requirements of rigidity, deformation and the like of a maglev train. The U-shaped beam and the rail supporting beam form a combined structure, and the rail supporting beam continuously extends along the line direction. The cross section of the U-shaped beam is U-shaped, the U-shaped beam is provided with a U-shaped beam bottom plate and U-shaped beam webs on two sides, the rail bearing beam is provided with a rail bearing beam top plate and rail bearing beam webs on two sides, and the lower ends of the rail bearing beam webs on two sides are fixedly connected with the U-shaped beam bottom plate to form a whole. The power supply rails are arranged on the outer walls of the web plates of the rail bearing beams on the two sides, the rail bearing platform is fixedly installed on the top plate of the rail bearing beam, the rail structure is fixedly installed on the rail bearing platform, and the cable supports are fixedly installed on the inner walls of the web plates of the U-shaped beams on the two sides.
Description
Technical Field
The invention relates to bridge engineering, in particular to a combined U-shaped beam structure of medium-low speed magnetic levitation traffic.
Background
The magnetic suspension rail transit has the characteristics of strong climbing capability, small turning radius, no abrasion, low noise and the like, is rapidly developed in recent years and is increasingly applied to urban rail transit and scenic spot tourism rail transit, but the magnetic suspension train has high requirements on the rigidity of a beam body and strict requirements on the deformation of the beam body and the manufacturing and mounting precision of a track and a track bearing beam.
The structural form of the magnetic suspension bridge is adapted to the running mode of a magnetic suspension vehicle, the structural design of the bridge is matched with the self characteristics of magnetic suspension rail traffic, the magnetic suspension bridge has higher requirements on environmental protection, landscape, mechanical property and construction convenience compared with the traditional wheel rail, therefore, the design and material selection of the bridge structure are compatible with noise reduction and energy conservation, the appearance of the bridge is simple and neat, the beam body has better rigidity and smaller deformation, and the beam type is convenient to transport and erect for construction.
As a novel beam type, the U-shaped beam is gradually applied to urban rail transit systems mainly comprising wheel-rail systems in recent years due to good landscape effect, low building height and high section utilization rate, but the traditional U-shaped beam has the following characteristics: the influence of the sectional shape and the construction details on the mechanical property is large; the opening thin-wall section is provided, the beam body is weak in rigidity, particularly torsional rigidity, and large in vertical deformation under the action of load; the beam body prestress arrangement space is limited, the steel bundles are mostly arranged on the section bottom plate, and the residual creep deformation of the beam body is large under the prestress action. The characteristics of the traditional U-shaped beam limit the application range and increase the design difficulty of the traditional U-shaped beam.
The magnetic levitation vehicle usually needs to be in a track holding mode to run, and meanwhile, in order to meet the requirements of the magnetic levitation vehicle on beam rigidity and deformation, the magnetic levitation bridge is commonly used at present in two types, namely a track beam and a large box beam.
First, track beam
Referring to fig. 1, a magnetic levitation track beam A is a small box beam with a top width of 1-2 m, a track bearing platform is arranged on the beam, sleepers are arranged on the track bearing platform, and a track structure is placed on the track bearing platform; pre-embedding power supply rail embedded parts on two sides of the track beam, and installing power supply rails; a cross beam B can be arranged between the two track beams A of the double lines by utilizing the space at the lower part of the box body, embedded parts are embedded on the cross beam, and an evacuation platform is arranged. There are mainly the following problems:
1. because the magnetic suspension vehicle usually needs to carry the rail, the transverse width of the track beam A is controlled by the vehicle limit, in order to improve the bending rigidity of the section of the track beam, and meanwhile, the lower part of the double-line track beam is convenient to arrange a transverse connecting beam B, the height of the track beam A is usually higher, the height of the beam body is higher, and cables and power supply rails are hung outside the beam body, so that the landscape effect of the bridge is poorer;
2. the track beam A is narrow in beam body, the rail bearing platform steel bars are reserved on the track beam A, the frame transporting construction on the frame transporting equipment beam is difficult, the curved section needs to be bent by a curved beam and is often twisted, the track beam A is usually transported by ground roads and erected by a crawler crane, and the construction difficulty is large under the condition of poor ground road conditions. The erection precision of the track beam A is high, and the erection precision of the beam body directly influences the installation of the power supply track and the track panel;
3. the power supply rail is exposed outside the beam body, no protective measures are taken, and the potential safety hazard is large. The beam body is narrow, the beam is not provided with a maintenance operation platform, and the maintenance and maintenance operation conditions during operation are poor;
4. the track beam A is a closed section, and the uneven change of the section temperature of the beam body easily causes the vertical deformation of the beam body, so that the safe operation of the magnetic suspension train is not favorable.
Second, big box girder
Referring to fig. 2, big case roof beam portion structure divide into about two-layer, and the lower floor is big case roof beam C, and the upper strata is support rail roof beam D, and big case roof beam C of lower floor is the main bearing structure of magnetic suspension bridge, and upper portion support rail roof beam D sets up the crack along the bridge to, only plays the transmission vertical load effect. There are mainly the following problems:
1. because the maglev vehicle has large requirements on the rigidity of the beam body, the height of the lower layer large box beam C is larger, and the rail bearing beam D is superposed, the landscape effect of the beam body is poorer;
2. the beam body is large in size and poor in engineering economy; the beam body is heavy, the road transportation is difficult, large-scale beam upper transportation and erection equipment is needed, and the design of the bridge structure is relatively controlled by the construction load of the beam body transportation and erection;
3. the beam type has poor adaptability to sections with large line spacing change, and the line spacing of the magnetic suspension line needs to be pulled open at the position where a turnout is arranged and around an island-type station, so that the structure of a box room needs to be changed to adapt to the change of the line, and the standardization and the industrialization of bridge manufacturing and erection are not facilitated.
4. The whole-hole box beam is a closed section, uneven nonlinear temperature change is easily generated on the section, the change can cause vertical deformation of the beam body, and the safe operation of the magnetic suspension train is not facilitated.
In summary, the beam type commonly used in the magnetic levitation track traffic generally has the defects of large structure height, poor landscape effect, more transportation frame construction restriction factors, large influence of nonlinear temperature change of the cross section and the like, and also has the problems of difficult operation and maintenance, poor adaptability to variable line spacing and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a combined U-shaped beam structure of a medium-low speed maglev traffic, which effectively reduces the height of a bridge, improves the landscape of the bridge, facilitates transportation, erection and construction, operation and maintenance and improves adverse temperature influence on the premise of meeting the requirements of rigidity, deformation and the like of a maglev train.
The technical scheme adopted by the invention to solve the technical problem is as follows:
the invention relates to a combined U-shaped beam structure of a medium-low speed magnetic levitation traffic, which is characterized in that: the U-shaped beam and the rail supporting beam form a combined structure, and the rail supporting beam continuously extends along the line direction; the cross section of the U-shaped beam is U-shaped, the U-shaped beam is provided with a U-shaped beam bottom plate and U-shaped beam webs on two sides, the rail-bearing beam is provided with a rail-bearing beam top plate and rail-bearing beam webs on two sides, and the lower ends of the rail-bearing beam webs on two sides are fixedly connected with the U-shaped beam bottom plate to form a whole; the power supply rails are arranged on the outer walls of the web plates of the rail bearing beams on the two sides, the rail bearing platform is fixedly installed on the top plate of the rail bearing beam, the rail structure is fixedly installed on the rail bearing platform, and the cable supports are fixedly installed on the inner walls of the web plates of the U-shaped beams on the two sides.
U-shaped beam prestressed steel strands or steel bundles which are tensioned along with the prefabrication of the U-shaped beams are arranged in the U-shaped beam bottom plate and the U-shaped beam web plate; and the rail bearing beam web plate and the rail bearing beam top plate are internally provided with a rail bearing beam post-tensioning prestressed steel strand which is tensioned after the second-stage dead load construction of the beam body is finished.
The advantages of the present invention are mainly embodied in the following aspects,
the U-shaped beam and the bearing rail beam form a combined bearing structure, the height of the bearing rail beam structure is small, the utilization rate of the cross section is high, the appearance of the bridge is simple, and the landscape effect of the bridge is good;
secondly, the web plates of the U-shaped beams are concentric circles, and the bottoms of the web plates are large chamfers, so that the stress of the web plates of the U-shaped beams is effectively improved;
thirdly, the bearing rail beam and the U-shaped beam are stressed integrally, and the bridge has high integral structural rigidity and good mechanical property;
fourthly, the advantages of the opening section are fully utilized, the temperature change of the section is uniform under the action of sunlight, the vertical deformation of the beam body is small, and the magnetic levitation travelling crane is facilitated;
and fifthly, the U beam can be used as a construction platform of the rail bearing beam, the bridge construction is convenient, and the accuracy of the rail bearing beam is easy to control. Can be widely applied to the field of medium and low speed magnetic levitation transportation.
Sixthly, the beam body steel bundle arrangement space is large, and the steel bundle arranged on the rail bearing beam can be tensioned for the second time, so that the prestress and the shrinkage creep deformation can be conveniently controlled.
Drawings
The specification includes the following five figures:
FIG. 1 is a schematic structural view of a prior art track beam;
FIG. 2 is a schematic structural view of a prior art large box girder;
FIG. 3 is a schematic diagram of a standard double-line cross-sectional layout of a U-shaped beam structure of a medium-low speed magnetic levitation transportation combination according to the present invention;
FIG. 4 is a schematic diagram of a standard single-line cross-sectional layout of a U-shaped beam structure of a medium-low speed magnetic levitation transportation combination according to the present invention;
FIG. 5 is a schematic cross-sectional structure view of a U-shaped beam structure of a medium-low speed magnetic levitation transportation combination of the present invention.
The figures show the components and corresponding references: the device comprises a track beam A, a cross beam B, a large box girder C, a track supporting beam D, U, a beam bottom plate 11, a U-shaped beam web 12, a U-shaped beam flange plate 13, a cable bracket 14, a track supporting beam web 15, a track supporting beam top plate 16, a track supporting platform 17, a track structure 18, a power supply rail 19, a U-shaped beam prestress stranded wire or steel beam 21 and a track supporting beam post-tensioned prestress steel beam 22.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 4, the U-shaped beam structure of the medium-low speed magnetic levitation traffic combination of the invention is a combined structure formed by the U-shaped beam and the track supporting beam, and the track supporting beam continuously extends along the line direction without a broken seam. The section of the U-shaped beam is U-shaped, and the U-shaped beam is provided with a U-shaped beam bottom plate 11 and U-shaped beam webs 12 on two sides, the rail bearing beam is provided with a rail bearing beam top plate 16 and rail bearing beam webs 15 on two sides, the lower ends of the rail bearing beam webs 15 on two sides are fixedly connected with the U-shaped beam bottom plate 11 to form a whole, no broken seam is formed between the U-shaped beam and the rail bearing beam, and a combined structure is formed to participate in structural stress together. The rail bearing beam participates in the whole stress of the structure, and the section rigidity of the beam body is effectively improved. The rail supporting beam structure only needs to meet the installation requirements of the power supply rails and the vehicle limit, the minimum height allowed by the limit can be adopted, and the better the bridge landscape effect is. The combined U-shaped beam structure has the advantages that the height of the rail bearing beam structure is low, the U-shaped beam is of an open thin-wall structure, the temperature change of the cross section of the beam body is uniform under the action of sunlight, most of temperature deformation is axial deformation, and the influence on the magnetic levitation train is small.
Referring to fig. 3 and 4, the inner and outer surfaces of the U-shaped beam web 12 are in a concentric circle configuration, and the bottom of the U-shaped beam web 12 is connected with the U-shaped beam bottom plate 11 by a large chamfer. The power supply rails 19 are arranged on the outer walls of the bearing rail beam webs 15 on the two sides, the bearing rail platform 17 is fixedly installed on the bearing rail beam top plate 16, the rail structure 18 is fixedly installed on the bearing rail platform 17, and the height of the bearing rail beam can be set according to the minimum height required by a limiting range. And cable brackets 14 are fixedly arranged on the inner walls of the U-shaped beam webs 12 at two sides, and strong-current cables and weak-current cables are arranged on the cable brackets 14. Because the cables, the power supply rails 19 and the like are arranged inside the U-shaped beam, the bridge has concise appearance and good landscape effect.
As shown in FIG. 5, U-shaped beam prestress steel strands or steel bundles 21 which are tensioned along with the prefabrication of the U-shaped beams are arranged in the U-shaped beam bottom plate 11 and the U-shaped beam web plate 12. And a rail bearing beam post-tensioned prestressed steel strand 22 which is tensioned after the second-stage dead load construction of the beam body is finished is arranged in the rail bearing beam web 15 and the rail bearing beam top plate 16. In the arrangement of the prestressed steel beams, the rail supporting beam increases the arrangement space of the prestressed steel beams of the beam body, and the steel beams of the beam body can be implemented in stages according to the requirements of structural stress and deformation control. Pre-tensioning method or post-tensioning method U-beam prestress steel strands or steel bundles 21 are arranged in the U-beam and are implemented in advance. The rail beam post-tensioning prestressed steel beam 22 is arranged in the rail bearing beam, and tensioning is carried out after the construction of the rail bearing beam is finished, so that the stress difference of the upper edge and the lower edge of the beam body and the stress level of the beam body are in a reasonable range, and the vertical deformation of the beam body caused by the pre-stressing and creep effects of the beam body can be effectively controlled.
Referring to fig. 4, the upper ends of the two U-shaped beam webs 12 are provided with U-shaped beam flange plates 13 connected with the U-shaped beam webs integrally. The U-shaped beam flange plate 13 can be provided with equipment (cameras, signal lamps and the like) and also can be used as an evacuation or overhaul platform.
In the aspect of bridge construction, the U-shaped beams are prefabricated in a centralized mode in a beam field, the erected U-shaped beams can be used as a transportation channel, the beams are transported and erected, ground road transportation and crawler crane erection can also be used, the construction mode is flexible, the adaptability is high, the rail bearing beams on the upper portions of the U-shaped beams can be used as a construction platform for secondary pouring after the U-shaped beams are erected in place, and the construction precision is easy to control.
The applicant successfully applies the method to the design of the Hunan Phoenix magnetic levitation cultural tourism project, can effectively improve the mechanical property and the landscape effect of the medium-low speed magnetic levitation bridge, successfully reduces the adverse effects of the temperature effect and the beam creep deformation on the running of the magnetic levitation train, and successfully solves the problem of high difficulty in construction and later operation maintenance of the magnetic levitation bridge in scenic spots.
The foregoing is merely illustrative of some of the principles of the U-beam structure of a medium and low speed magnetic levitation transportation assembly of the present invention and is not intended to limit the invention to the specific structures and applications shown and described, and accordingly, all modifications and equivalents that may be utilized are intended to fall within the scope of the claims.
Claims (4)
1. A middle-low speed magnetic levitation traffic combined U-shaped beam structure is characterized in that: the U-shaped beam and the rail supporting beam form a combined structure, and the rail supporting beam continuously extends along the line direction; the cross section of the U-shaped beam is U-shaped, the U-shaped beam is provided with a U-shaped beam bottom plate (11) and U-shaped beam webs (12) on two sides, the rail bearing beam is provided with a rail bearing beam top plate (16) and rail bearing beam webs (15) on two sides, and the lower ends of the rail bearing beam webs (15) on two sides are fixedly connected with the U-shaped beam bottom plate (11) to form a whole; the power supply rails (19) are arranged on the outer walls of the two side rail bearing beam webs (15), rail bearing platforms (17) are fixedly installed on the rail bearing beam top plates (16), rail structures (18) are fixedly installed on the rail bearing platforms (17), and cable supports (14) are fixedly installed on the inner walls of the two side U-shaped beam webs (12).
2. The combined U-shaped beam structure of the medium-low speed magnetic levitation transport system as claimed in claim 1, wherein: u-shaped beam prestressed steel strands or steel bundles (21) which are tensioned along with the prefabrication of the U-shaped beams are arranged in the U-shaped beam bottom plate (11) and the U-shaped beam web plate (12); and a rail bearing beam post-tensioned prestressed steel strand (22) which is tensioned after the second-stage dead load construction of the beam body is finished is arranged in the rail bearing beam web plate (15) and the rail bearing beam top plate (16).
3. The combined U-shaped beam structure of the medium-low speed magnetic levitation transport system as claimed in claim 1, wherein: the upper ends of the U-shaped beam webs (12) at the two sides are provided with U-shaped beam flange plates (13) which are connected with the U-shaped beam webs into a whole.
4. The combined U-shaped beam structure of the medium-low speed magnetic levitation transport system as claimed in claim 1, wherein: the inner surface and the outer surface of the U-shaped beam web plate (12) adopt a concentric circle structure, and the bottom of the U-shaped beam web plate (12) is connected with the U-shaped beam bottom plate (11) by adopting a large chamfer angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111119829.XA CN113957755A (en) | 2021-09-24 | 2021-09-24 | Medium-low speed magnetic levitation traffic combined U-shaped beam structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111119829.XA CN113957755A (en) | 2021-09-24 | 2021-09-24 | Medium-low speed magnetic levitation traffic combined U-shaped beam structure |
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| CN113957755A true CN113957755A (en) | 2022-01-21 |
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| CN202111119829.XA Pending CN113957755A (en) | 2021-09-24 | 2021-09-24 | Medium-low speed magnetic levitation traffic combined U-shaped beam structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142336A (en) * | 2022-07-26 | 2022-10-04 | 北京城建设计发展集团股份有限公司 | Novel pier for urban rail transit for cable bridge erection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142336A (en) * | 2022-07-26 | 2022-10-04 | 北京城建设计发展集团股份有限公司 | Novel pier for urban rail transit for cable bridge erection |
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