CN115559156B - Wedge-shaped supporting structure of assembly type track and mounting method thereof - Google Patents
Wedge-shaped supporting structure of assembly type track and mounting method thereof Download PDFInfo
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- CN115559156B CN115559156B CN202211553324.9A CN202211553324A CN115559156B CN 115559156 B CN115559156 B CN 115559156B CN 202211553324 A CN202211553324 A CN 202211553324A CN 115559156 B CN115559156 B CN 115559156B
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
- E01B1/005—Ballastless track, e.g. concrete slab trackway, or with asphalt layers with sleeper shoes
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Abstract
The invention discloses a wedge-shaped supporting structure of an assembled track and an installation method thereof, and relates to the technical field of track traffic.A wedge-shaped supporting structure is arranged between a prefabricated track plate and an inverted arch of a tunnel structure, a reserved guide groove for inserting the wedge-shaped supporting structure is prefabricated on the side surface of the prefabricated track plate, and the wedge-shaped supporting structure comprises a first surface and a second surface; the radius of curvature of the first surface is equal to the radius of curvature of the inverted arch of the tunnel structure; the second surface is a third paraboloid matched with the bottom surface of the reserved guide groove, and the curvatures of the third paraboloid at each point are different; the curvature radius of the wedge-shaped supporting structure is set to be consistent with that of the inverted arch, so that the wedge-shaped supporting structure can conveniently slide and support on the inverted arch of the structure; and the upper surface of the wedge-shaped supporting structure is provided with a cubic parabolic curved surface, so that the wedge-shaped supporting structure can conveniently slide and contact with the prefabricated track slab, and the change of the normal direction can be adapted in the height adjustment process.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a wedge-shaped supporting structure of a shield interval assembly type rail.
Background
At present, the urban rail transit track structure is mainly divided into a cast-in-place integral track bed track structure and a prefabricated track structure. The cast-in-situ integral track bed structure mainly comprises a sleeper and a track bed. When in construction, firstly, the track panel and the sleeper are erected in place, then the reinforcing steel bars are bound, and finally concrete is poured. Its most important advantages are low cost, high adaptability, and high strength of field and environment pollution.
Therefore, in order to overcome the defects, the prefabricated track bed is produced, and the prefabricated track structure which is applied to the market at present is a national iron III type slab structure, and the structure comprises a prefabricated slab, a filling layer and a base. The disadvantages of the prefabricated track slab are high cost, large on-site masonry amount, low assembly rate, complex process, slow progress, etc. The high cost is mainly caused by complex structure, multiple working procedures, high labor and time cost, large mechanical consumption and the like.
In order to further improve the assembly rate of the assembly type track, improve the construction efficiency and reduce the construction cost of the assembly type track, a novel rapid assembly type track slab needs to be developed.
Disclosure of Invention
The invention aims to provide a wedge-shaped supporting structure of an assembly type track and an installation method thereof, and aims to solve the technical problems that an assembly type track plate in the prior art is low in assembly efficiency and high in engineering cost.
The invention provides a wedge-shaped supporting structure of an assembly track, which is arranged between a prefabricated track plate and an inverted arch of a tunnel structure, wherein a reserved guide groove for inserting the wedge-shaped supporting structure is prefabricated on the side surface of the prefabricated track plate, and the wedge-shaped supporting structure comprises a second surface facing the prefabricated track plate and a first surface facing the inverted arch of the tunnel structure;
the radius of curvature of the first surface is equal to the radius of curvature of the tunnel structure inverted arch such that the first surface can closely conform to the tunnel structure inverted arch;
the second surface is a third paraboloid matched with the bottom surface of the reserved guide groove, and the curvatures of the third paraboloid at each point are different so that the second surface can be always in contact with the bottom surface of the reserved guide groove.
Furthermore, in the direction perpendicular to the wedge-shaped supporting structure inserted into the reserved guide groove, one opposite side surface of the wedge-shaped supporting structure is a hyperbolic trapezoid section, and the thicknesses of the two ends of the wedge-shaped supporting structure are different.
Further, along the inserting direction of the wedge-shaped supporting structure, the height of the wedge-shaped supporting structure is changed in a nonlinear mode, so that the elevation of the prefabricated track slab can be adjusted in a stepless mode.
Furthermore, the wedge-shaped supporting structure is of a reinforced concrete structure, and a reinforcing mesh is arranged in the wedge-shaped supporting structure.
Further, a coupling layer is arranged on the second surface, and the coupling layer is made of an elastic material so that the wedge-shaped support structure can be rigidly coupled with the prefabricated track slab.
Further, along the direction that the wedge-shaped supporting structure is inserted into the reserved guide groove, one opposite side surfaces of the wedge-shaped supporting structure are parallel to each other.
The invention also provides an installation method of the wedge-shaped support structure of the assembly type track, which comprises the following steps:
transporting the prefabricated track plate and the wedge-shaped supporting structure to a track laying working surface;
coarsely laying the prefabricated track slab in place so that the tunnel structure inverted arch is in contact with the prefabricated track slab;
adjusting the space coordinates of the prefabricated track slab so that the control point coordinates, the elevation and the gradient of the prefabricated track slab all meet the design requirements;
inserting the smaller thickness ends of all the wedge-shaped supporting structures into the reserved guide grooves at the end parts of the prefabricated track slabs one by one so that the upper surfaces of the wedge-shaped supporting structures are in contact with the reserved guide grooves of the prefabricated track slabs;
applying a force to one end of the wedge-shaped supporting block with the larger thickness to enable the wedge-shaped supporting structure to slide along the inverted arch of the tunnel structure to be in close contact with the prefabricated track slab;
further, the method also comprises the step of assembling the wedge-shaped support structure on the curve section, and specifically comprises the following steps:
and adjusting the prefabricated track slab according to the curve ultrahigh value, rotating the wedge-shaped supporting structure on the inner side of the curve by an angle a corresponding to the half ultrahigh value in the section of the circular curve, applying an acting force to one end of the wedge-shaped supporting structure with smaller thickness to enable the wedge-shaped supporting structure to be in a complete stress state, rotating the wedge-shaped supporting structure on the outer side of the curve by the same angle a, and ensuring the complete stress of the wedge-shaped supporting structure.
Compared with the prior art, the invention has the beneficial effects that:
(1) The wedge-shaped supporting structure is arranged below the prefabricated track slab, the supporting structure is of a reinforced concrete structure, and the reinforcing mesh is arranged inside the supporting structure, so that the strength requirement can be met, and the concrete structure is prevented from cracking;
(2) The curvature radius of the wedge-shaped supporting structure is set to be consistent with that of the inverted arch, so that the wedge-shaped supporting structure can conveniently slide and support on the inverted arch of the structure;
(3) According to the invention, the cubic parabolic curved surface is arranged on the upper surface of the wedge-shaped supporting structure, so that the wedge-shaped supporting structure can conveniently slide and contact with the prefabricated track slab, and the change of the normal direction can be adapted in the height adjustment process;
(4) According to the invention, the elastic coupling layer is arranged on the upper surface of the wedge-shaped supporting structure, so that the rigidity coupling of the prefabricated track slab and the wedge-shaped supporting structure during contact is ensured, the contact area is increased, and the strength safety of the wedge-shaped structure is ensured;
according to the invention, the double curved surfaces are arranged on the wedge-shaped supporting structure, so that the wedge-shaped supporting structure can be conveniently subjected to stepless adjustment in the process of adjusting the height of the prefabricated track, and the precision can reach any value within a certain range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a cross-sectional view of a fabricated rail provided in accordance with an embodiment of the present invention;
FIG. 2 is a plan view of a fabricated track provided by an embodiment of the present invention;
FIG. 3 is a perspective view of a wedge-shaped support structure provided by an embodiment of the present invention;
FIG. 4 is a bottom view of a fabricated rail provided by embodiments of the present invention;
FIG. 5 is a cross-sectional view of a shield tunnel track according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a rectangular tunnel track provided by an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a horseshoe tunnel track provided by an embodiment of the present invention;
fig. 8 is a cross-sectional view of the prefabricated track slab with a circular curve section according to the embodiment of the present invention after adjustment.
Reference numerals:
1. prefabricating a track slab; 2. reserving a guide groove; 3. a wedge-shaped support structure; 4. a second surface; 5. a first surface; 6. a shield segment; 7. a coupling layer; 8. reserving the side surface of the guide groove; 9. reserving the bottom surface of the guide groove; 10. a filling layer; 11. the inner surface of the shield segment; 12. a front surface; 13. a rear surface.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring now to fig. 1 to 4, the present invention is a wedge-shaped support structure 3 for shield zones and horseshoe tunnel fabricated rails, which is a prefabricated concrete structural member in which a reinforcing mesh is disposed to improve tensile strength and crack resistance of the structure. The concrete grade was C50, and the rebar grade was HPB300.
The wedge-shaped supporting structure 3 and the prefabricated track plate 1 work through a specific working guide groove, the prefabricated track plate 1 and an inverted arch of a tunnel structure form a permanent stress structure through a filling layer by the aid of the supporting structure, specifically, when the prefabricated track plate 1 is prefabricated in a factory, reserved guide grooves 2 are prefabricated on two sides of the prefabricated track plate 1, the appearance of each reserved guide groove 2 is a concave rectangular groove, and each reserved guide groove 2 is provided with 3 surfaces which are a reserved guide groove side surface 8 and a reserved guide groove bottom surface 9. Two reserved guide groove side surfaces 8 are arranged, and two surfaces of the reserved guide groove side surfaces are parallel to each other; the bottom surface 9 of the reserved guide groove is a parabolic curved surface which is in contact with the wedge-shaped support structure 3 during operation.
The wedge-shaped supporting structure 3 has an irregular hexahedral structure including a second surface 4 facing the prefabricated track slab 1 and a first surface 5 facing the tunnel structure inverted arch, wherein a radius of curvature of the first surface 5 is equal to a radius of curvature of the tunnel structure inverted arch so that the first surface 5 can be closely attached to the tunnel structure inverted arch.
That is, when the tunnel structure is an inverted arch of a circular arc, as shown in fig. 5 and 7, such as a shield area or a horseshoe tunnel, the lower surface of the wedge-shaped support structure 3 is a circular arc, the curvature of the circular arc is the same as the shield segment inner surface 11, and the first surface 5 is always in contact with the inner surface of the inverted arch of the structure bottom when the tunnel structure is put into operation, and the contact area is the surface area of the first surface 5. The first surface 5 may slide along the shield segment inner surface 11. The second surface 4 of the wedge-shaped supporting structure 3 is a cubic parabolic curved surface, the curvature of each point of the second surface is different, and the wedge-shaped supporting structure is characterized in that along with the change of the curvature, in the inserting process of the wedge-shaped supporting structure 3, the first surface 5 of the wedge-shaped supporting structure 3 is always in complete contact with the inner surface of the inverted arch at the bottom of the structure, a part of area of the second surface 4 is always attached to the bottom surface of the reserved guide groove 2, the contact area of the second surface is variable, and the size of the value can meet the strength requirement. A coupling layer 7 is arranged on the second surface 4 of the wedge-shaped support structure 3, the coupling layer 7 is made of an elastic material and is positioned between the wedge-shaped support structure 3 and the prefabricated track when the coupling layer is put into operation, so that a rigid coupling effect is realized, and the wedge-shaped support structure 3 and the prefabricated track can work together.
The wedge-shaped supporting structure 3 is matched with the prefabricated track plate 1 for use, and the wedge-shaped supporting structure and the prefabricated track plate form an assembled track structure together. The wedge-shaped supporting structure 3 is suitable for shield intervals and horseshoe tunnels, and relevant parameters need to be adjusted when the wedge-shaped supporting structure is applied to other structural forms. When the radius of curvature of the first surface 5 of the wedge-shaped support structure 3 is adjusted to infinity, as shown in fig. 6, the first surface 5 of the wedge-shaped structure is a plane; meanwhile, the normal directions of all points on the second surface 4 are fixed, and the assembled track structure is suitable for rectangular tunnel sections.
In addition, considering the installation of the wedge-shaped supporting structure 3, in the direction perpendicular to the insertion direction of the wedge-shaped supporting structure 3 into the reserved guide groove 2, one opposite side surface of the wedge-shaped supporting structure 3 is a hyperbolic trapezoid cross section, the thicknesses of two ends of the wedge-shaped supporting structure 3 are different so as to be suitable for insertion and tight abutment during assembly, and along the insertion direction of the wedge-shaped supporting structure 3, the height of the wedge-shaped supporting structure 3 is in nonlinear change, so that the stepless adjustment of the elevation of the prefabricated track slab 1 can be realized, and the wedge-shaped supporting structure 3 can also be suitable for the deviation of any horizontal and vertical numerical value within a certain range; the other opposite side of the wedge-shaped support structure 3, i.e. the front surface 12 and the rear surface 13 shown in fig. 3, are parallel to each other in the direction of insertion of the wedge-shaped support structure 3 into the pre-groove 2, facilitating the application of the wedge-shaped support block abutment force.
The invention mainly aims at the shield interval assembly type track. The application of the shield interval fabricated track is basically divided into two working conditions, namely a straight line segment and a curve segment.
The embodiment of the straight shield interval fabricated track is as follows:
before track laying starts, the establishment of a measurement system is completed firstly, and the coordinate and the elevation of each mileage point are ensured to meet the requirements of relevant specifications. And then, the work of line adjustment and slope adjustment is finished by using the measurement result, and different types of the prefabricated track slabs 1 are preliminarily selected according to the line adjustment and slope adjustment result. After the wedge-shaped supporting structure 3 and the prefabricated track plate 1 are completely transported to a track laying working face in the track laying process, firstly, the prefabricated track plate 1 needs to be coarsely laid in place, namely, the prefabricated track plate 1 is hung in a correct mileage, and at the moment, the inner surface 11 of the shield segment is in direct contact with the lower surface of the prefabricated track plate 1. The load is directly transmitted to the foundation through the shield segment 6. And then, hoisting the prefabricated track plate 1 by using a large machine, adjusting the space coordinate of the prefabricated track according to the calculation result of the plate paving software to ensure that the control point coordinate, the elevation and the gradient of the prefabricated track plate 1 meet the requirements, and then fixing the state of the large machine and keeping the large machine in a load state. At the moment, the wedge-shaped supporting structures 3 are conveyed to the reserved guide grooves 2 at the end parts of the prefabricated track slabs 1 and are symmetrically distributed.
The first surface 5 of the wedge-shaped supporting structure 3 is in contact with the inner surface 11 of the shield segment, the second surface 4 of the wedge-shaped supporting structure 3 is in contact with the reserved guide groove 2 of the prefabricated track slab 1, the contact surface is not completely stressed at the moment, and part of the contact surface is in a form contact state. To ensure that the wedge-shaped support structure 3 is able to be placed in a fully stressed state, it is necessary to apply a force F, the value of which is not more than 1kN, on the rear surface 13 of the wedge-shaped support structure 3. The wedge-shaped support structure 3 slides along the shield segment 6 under the action of the force F, and simultaneously rotates around the center of the tunnel, and the normal line of the force bearing point also changes along with the rotation of the wedge-shaped support structure 3. After the force F is applied, the coupling layer 7 is elastically deformed to a certain extent, so that the wedge-shaped support structure 3 is ensured to be in close contact with the prefabricated track slab 1, and the wedge-shaped support structure 3 is in a completely stressed state, so that the installation of the first wedge-shaped support structure 3 is completed. In the same way, after the rest of the wedge-shaped supporting structures 3 are also installed in place, the fine adjustment of the straight-line-section assembly type track is finished, and the rest of the procedures are to pour the filling layer 10 and finish the maintenance.
The embodiment of the assembled track of the shield interval of the curve segment is as follows:
the biggest difference between the assembled track and the straight line segment in the shield section of the curve segment is that the influence of curve superelevation is increased, and in the moderate curve segment, the superelevation cannot be directly set according to the method of a cast-in-place track bed, because the specification of the prefabricated track slab 1 needs to be adjusted due to the influence of a space curve and a space curved surface, so as to ensure the curve fitting of a straight curve instead of a curved curve. After the installation of straightway wedge-shaped supporting structure 3 is completed, prefabricated track slab 1 needs to be adjusted according to curve ultrahigh value, angle a corresponding to half ultrahigh is needed to be adjusted in a circular curve section, as shown in fig. 8, wedge-shaped supporting structure 3 on the inner side of the curve needs to deflect the same angle a to the direction on the outer side of the curve at the moment, after the circular curve section is preliminarily put in place, certain force F needs to be applied, the situation that the wedge-shaped supporting structure is in a complete stress state is ensured, similarly, wedge-shaped supporting structure 3 on the outer side of the curve also deflects the same angle a to the direction on the outer side of the curve, and the complete stress of the wedge-shaped supporting structure is ensured. And finally, removing the large machine and entering the next working surface.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A wedge-shaped supporting structure of an assembled track is characterized by being arranged between a prefabricated track plate (1) and an inverted arch of a tunnel structure, wherein a reserved guide groove (2) for inserting the wedge-shaped supporting structure (3) is prefabricated on the side surface of the prefabricated track plate (1), an arc surface which protrudes outwards is arranged at the bottom of the prefabricated track plate (1) and is adaptive to the shape of the inverted arch of the tunnel structure, and the wedge-shaped supporting structure (3) comprises a second surface (4) facing the prefabricated track plate (1) and a first surface (5) facing the inverted arch of the tunnel structure; -the radius of curvature of the first surface (5) is equal to the radius of curvature of the tunnel structure inverted arch such that the first surface (5) can be brought into close abutment with the tunnel structure inverted arch; the second surface (4) is a third paraboloid matched with the bottom surface (9) of the reserved guide groove, the curvatures of the third paraboloid at each point are different, so that the second surface (4) can be always in contact with the bottom surface (9) of the reserved guide groove, and the height of the wedge-shaped supporting structure (3) changes in a nonlinear mode along the inserting direction of the wedge-shaped supporting structure (3), so that the elevation of the prefabricated track plate (1) can be adjusted in a stepless mode.
2. Wedge-shaped support structure of an assembled track according to claim 1, characterised in that, in a direction perpendicular to the insertion direction of the wedge-shaped support structure (3) into the pre-groove (2), one opposite side of the wedge-shaped support structure (3) is of a hyperbolic trapezoid cross-section, and the thickness of the two ends of the wedge-shaped support structure (3) is different.
3. Wedge-shaped support structure of a fabricated rail according to claim 1, wherein the wedge-shaped support structure (3) is a reinforced concrete structure and a reinforcing mesh is provided inside thereof.
4. The wedge-shaped support structure of a fabricated rail according to claim 1, wherein: a coupling layer (7) is arranged on the second surface (4), and the coupling layer (7) is made of an elastic material so that the wedge-shaped support structure (3) can be rigidly coupled with the prefabricated track slab (1).
5. Wedge-shaped support structure of an assembled track according to claim 1, characterised in that one opposite side of the wedge-shaped support structure (3) is parallel to each other in the direction of insertion of the wedge-shaped support structure (3) into the pre-groove (2).
6. A method of installing a wedge-shaped support structure according to any one of claims 1-5, comprising the steps of: transporting the prefabricated track slab (1) and the wedge-shaped supporting structure (3) to a track laying working surface; coarsely paving a prefabricated track plate (1) in place to enable a tunnel structure inverted arch to be in contact with the prefabricated track plate (1); adjusting the space coordinate of the prefabricated track slab (1) so that the control point coordinate, the elevation and the gradient of the prefabricated track slab (1) all meet the design requirements; inserting the smaller thickness ends of all the wedge-shaped supporting structures (3) into the reserved guide grooves at the end parts of the prefabricated track slabs (1) one by one so that the upper surfaces of the wedge-shaped supporting structures (3) are in contact with the reserved guide grooves of the prefabricated track slabs (1); and applying a force to one end with larger thickness of the wedge-shaped supporting block to enable the wedge-shaped supporting structure (3) to slide along the inverted arch of the tunnel structure to be in close contact with the prefabricated track slab (1).
7. The installation method according to claim 6, comprising the assembly of the wedge-shaped support structure (3) in curved sections, in particular comprising: the prefabricated track slab (1) is adjusted according to curve ultrahigh values, the wedge-shaped supporting structure (3) on the inner side of the curve is rotated by an angle a corresponding to the half ultrahigh value in a circular curve section, an acting force is applied to one end with larger thickness of the wedge-shaped supporting structure (3) to enable the wedge-shaped supporting structure to be in a complete stress state, the wedge-shaped supporting structure (3) on the outer side of the curve is also rotated by the same angle a, and complete stress of the wedge-shaped supporting structure is guaranteed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211553324.9A CN115559156B (en) | 2022-12-06 | 2022-12-06 | Wedge-shaped supporting structure of assembly type track and mounting method thereof |
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| CN202211553324.9A CN115559156B (en) | 2022-12-06 | 2022-12-06 | Wedge-shaped supporting structure of assembly type track and mounting method thereof |
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| CN115559156B true CN115559156B (en) | 2023-03-21 |
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| CN108396596A (en) * | 2018-04-23 | 2018-08-14 | 杭州唐普徕科技有限公司 | Novel fully-prefabricated assembled track structure for railroad track field tunnel |
| FR3094381B1 (en) * | 2019-03-28 | 2021-03-12 | Systra | TRACK SECTION WITHOUT BALLAST FOR RAILWAY VEHICLES |
| CN111622503A (en) * | 2020-07-02 | 2020-09-04 | 中交路桥华南工程有限公司 | Height-adjustable cushion block |
| CN113958341A (en) * | 2021-08-31 | 2022-01-21 | 中铁第一勘察设计院集团有限公司 | Tunnel assembled inverted arch prefabricated block structure |
| CN114658034B (en) * | 2022-01-26 | 2023-07-21 | 华设设计集团股份有限公司 | Wedge-shaped supporting and retaining body for reinforcing arch feet of soft foundation open cut and buried tunnel and construction method |
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