Comprehensive grounding structure of urban railway ballast bed
By eliminating the backfill layer of the civil engineering and the external cable trough of the track bed in the shield tunnel of the urban railway, and adopting longitudinal and transverse grounding steel bars and through grounding wire troughs in the track bed, the grounding structure of the shield tunnel of the urban railway was simplified, the problems of excessive track structure height and complex construction were solved, and efficient and economical construction was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-03-31
AI Technical Summary
The existing urban railway shield tunnel track structure is too high, the construction is complex and the construction period is long, and the construction accuracy of the cable trench is difficult to guarantee, resulting in poor economic efficiency.
The backfill layer and external cable trough of the track bed were eliminated. Longitudinal and transverse grounding steel bars were arranged inside the track bed slab, combined with through grounding wire troughs and grounding terminals, to simplify the grounding structure and reduce the height of the track structure.
The height of the track structure was reduced, the amount of concrete used was decreased, the construction process was simplified, and the construction efficiency and economy were improved.
Smart Images
Figure CN224060990U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to rail transit engineering technical field, concretely relates to a city area railway bed comprehensive earthing structure. BACKGROUND
[0002] At present, the city area railway signal system adopts track circuit, and is consistent with national railway, and the ballastless bed needs to be comprehensively grounded, which is different from the stray current protection of the subway. The national railway comprehensive grounding is executed by the general drawing "Railway Comprehensive Grounding System" (No. (2016) 9301), but the drawing book does not have a shield tunnel working condition.
[0003] The conventional city area railway project shield tunnel track is responsible for the bed design of the range of 515mm below the track surface and 2800mm wide, and the backfill layer is below the bed, and the cable trench is arranged on both sides of the bed. The inside of the bed is a conventional insulating steel mesh, and one place every 100m is connected to the cable trench grounding steel mesh outside the bed. The comprehensive grounding steel mesh utilizes the backfill layer steel mesh below the bed, and the weak current cable trench and the strong current cable trench are provided with a through ground wire, a longitudinal grounding steel, a grounding terminal and the like. The disadvantages of the traditional scheme are that the structure height below the track is too large, generally more than 1250mm from the track surface to the segment, the backfill layer below the bed is constructed first, then the cable trench is constructed, and finally the bed is constructed. In the construction process, there are problems of complex professional interface, large amount of concrete, uneconomical, long construction period, and the like, and the cable trench is used as a dispersing channel, so that the precision is difficult to guarantee when being constructed first, and it is difficult to modify after the track is paved. SUMMARY
[0004] The utility model aims at the deficiencies of the prior art, and provides a city area railway bed comprehensive earthing structure, cancels the civil engineering backfill layer, cancels the cable trench outside the bed, and the cable and the dispersing are fixed to the shield segment by the support. The track structure height is reduced, the comprehensive grounding scheme is simplified, only 1050mm is needed, and the construction efficiency, construction period and economy are greatly improved.
[0005] The utility model is realized by the following technical scheme:
[0006] A city area railway bed comprehensive earthing structure comprises a plurality of bed plates arranged along the line direction, characterized by comprising longitudinal grounding steel, transverse grounding steel and comprehensive grounding steel mesh, the longitudinal grounding steel is connected with the transverse grounding steel, and both are embedded in the bed plate; the comprehensive grounding steel mesh is embedded in the bottom of each bed plate, and the comprehensive grounding steel mesh of every other bed plate is connected by the grounding steel; a plurality of bed plates are taken as a grounding unit at a certain distance, the grounding units are not connected with each other, the bed plates in a grounding unit are connected by the connecting terminal, and the connecting terminal is connected with the weak current side reserved terminal on the bed plate.
[0007] The track bed slab has a grounding terminal reserved at certain intervals on the weak current side. The grounding terminal is used for track bed grounding or weak current grounding. The grounding terminal is connected to the integrated grounding steel mesh through grounding steel bars.
[0008] A through grounding wire groove extending along the line direction is provided on the weak current side of the track bed slab. A through grounding wire is arranged in the through grounding wire groove and the through grounding wire is connected to the grounding steel bar of the integrated grounding steel mesh.
[0009] After the through ground wire is buried, the through ground wire trench is filled and sealed with C40 mortar.
[0010] The track bed slab has a high-voltage grounding terminal reserved at certain intervals on the high-voltage side. The high-voltage grounding terminal is used for high-voltage grounding and is connected to the integrated grounding steel mesh through a grounding steel bar.
[0011] The advantages of this utility model are: it reduces the height of the track structure in the shield tunnel of the urban railway, reduces the amount of concrete used, reduces the construction procedures, and simplifies the integrated grounding method; it also has good economic efficiency. Attached Figure Description
[0012] Figure 1 This is the cross-section of the present invention along the line direction. Figure I ;
[0013] Figure 2 This is the cross-section of the present invention along the line direction. Figure II ;
[0014] Figure 3 This is the cross-section of the present invention along the line direction. Figure III ;
[0015] Figure 4 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0016] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:
[0017] like Figures 1-4 As shown in the figure, numbers 1-14 represent: longitudinal grounding steel bar 1, grounding terminal 2, first grounding steel bar 3, second grounding steel bar 4, third grounding steel bar 5, fourth grounding steel bar 6, fifth grounding steel bar 7, first grounding terminal and sixth grounding steel bar 8, second grounding terminal and seventh grounding steel bar 9, through grounding wire trough 10, through grounding wire 11, L-shaped connector 12, third grounding terminal and eighth grounding steel bar 13, and integrated grounding steel mesh 14.
[0018] Example: Figures 1 to 4The municipal railway track bed comprehensive grounding structure in the embodiment is used to realize grounding of the municipal railway track bed. The embodiment first cancels the civil backfill layer, reduces the track structure height, and completes the track bed concrete pouring in one time.
[0019] Specifically, the comprehensive grounding track bed range is maintained as the original design, the track bed internal reinforcement is insulated, three upper layer longitudinal structural steel bars in the track bed plate, such as the one in the embodiment Figure 1 are used as the track bed longitudinal grounding steel bars 1, one transverse structural steel bar in each track bed plate is used as a transverse grounding steel bar (not shown in the figure) connected with each track bed longitudinal grounding steel bar 1, and auxiliary steel bars are used to connect the joints between the transverse grounding steel bar and the track bed longitudinal grounding steel bar 1. Each track bed plate is not greater than 100 m as one grounding unit, each grounding unit is not connected with each other, and each track bed plate in the same grounding unit is connected through terminals and connecting lines. Generally, the track bed grounding terminals in the middle of the grounding unit are connected with the first grounding terminal and the sixth grounding steel bar 8 arranged in the section to perform grounding.
[0020] The comprehensive grounding steel bar net 14 composed of the first grounding steel bar 3 and the second grounding steel bar 4 is separately arranged at the bottom of the track bed plate to realize the function of the base steel bar net as a grounding net. During on-site construction, the comprehensive grounding net 14 can be directly placed at the bottom of the tunnel segment to facilitate construction. Every other track bed plate is connected through the fifth grounding steel bar 7 and the longitudinal third grounding steel bar 5 and the fourth grounding steel bar 6.
[0021] Starting from the 2m point of the section circular tunnel, the first grounding terminal and the sixth grounding steel bar 8 are arranged every 25m on the weak electric side of the track bed plate, and the second grounding terminal and the seventh grounding steel bar 9 are arranged every 50m on the strong electric side of the track bed plate (one is additionally arranged at the contact passage). The first grounding terminal on the weak electric side and the second grounding terminal on the strong electric side are connected with the third grounding steel bar 5 and the fourth grounding steel bar 6 through the corresponding sixth grounding steel bar and seventh grounding steel bar. Among them, the first grounding terminal is used for track professional grounding and weak electric professional grounding, and the second grounding terminal is used for strong electric professional grounding.
[0022] The through ground wire slot 10 is arranged on the weak electric side of the track bed plate, and the through ground wire 11 is embedded in the through ground wire slot 10. The through ground wire is continuous and unbroken along the line direction. The third grounding steel bar 5 is connected with the through ground wire 11 through the third grounding terminal, the eighth grounding steel bar 13 and the L-shaped connecting piece 12 once every not more than 100 m. After the through ground wire 11 is embedded in the through ground wire slot 10, C40 mortar is used for filling and sealing to play a protection effect.
[0023] Although the above embodiments have been described in detail with reference to the accompanying drawings, those skilled in the art can realize that various improvements and changes can be made to the present application without departing from the scope defined by the claims, and therefore, the above description is not exhaustive.
Claims
1. A comprehensive grounding structure of a ballast bed of a city railway, comprising a plurality of ballast plates arranged along a track direction, characterized in that: The utility model relates to a kind of ground connection system of track bed, including longitudinal ground reinforcement, transverse ground reinforcement, comprehensive ground reinforcement net, the longitudinal ground reinforcement and the transverse ground connection, both are buried in track bed plate, the bottom of each track bed plate is buried with the comprehensive ground reinforcement net, and the comprehensive ground reinforcement net of interval track bed plate is connected by ground reinforcement every other track bed plate;With certain distance, several track bed plates are used as a grounding unit, each grounding unit is not interconnected, and each track bed plate in a grounding unit is interconnected by connecting terminal, and the connecting terminal is connected with weak electricity side reserved terminal on track bed plate.
2. The integrated grounding structure of a ballast of a metropolitan railway according to claim 1, characterized in that: The weak electricity side of the track bed plate reserves ground terminal every certain distance, and the ground terminal is used for track bed grounding or weak electricity grounding, and the ground terminal is connected with the comprehensive ground reinforcement net by ground reinforcement.
3. The integrated grounding structure of a ballast of a metropolitan railway according to claim 2, characterized in that: Through ground wire slot is arranged on the weak electricity side of the track bed plate and extends along the direction of line, and through ground wire is arranged in the through ground wire slot, and the through ground wire is connected with the ground reinforcement of the comprehensive ground reinforcement net.
4. The integrated grounding structure of a ballast of a metropolitan railway according to claim 3, characterized in that: After the through ground wire slot is buried with the through ground wire, it is filled and closed using C40 mortar.
5. The ballast integrated grounding structure of a metropolitan railway according to claim 1, characterized in that: The strong electricity side of the track bed plate reserves strong electricity ground terminal every certain distance, and the strong electricity ground terminal is used for strong electricity grounding, and the strong electricity ground terminal is connected with the comprehensive ground reinforcement net by ground reinforcement.