Reformed sleeper structure of existing subway line

Abstract

The utility model relates to the technical field of existing subway line transformation construction, in particular to an existing subway line transformation sleeper structure which comprises a prefabricated short sleeper, a long and narrow groove is formed in the prefabricated short sleeper, a hole is reserved in the groove bottom of the groove, a door-shaped steel bar is inserted into the hole, and the door-shaped steel bar is connected with the prefabricated short sleeper. The door-shaped steel bars and the grooves are connected into an integral structure by pouring fast-hardening mortar, and connecting holes are reserved in the prefabricated short sleepers. The sleeper has the advantages that the sleeper is simple and reasonable in structure, when the sleeper is applied to existing subway line transformation, existing short sleepers do not need to be dug out, only existing ballast bed concrete protection layers are chiseled away, existing ballast bed structural steel bars are not affected, and the transformation workload is small; the connection between the short sleeper and the ballast bed is enhanced, the structural performance is ensured, and construction is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of reconstruction construction of existing subway lines, in particular to a sleeper structure for reconstructing existing subway lines. Background Technique

[0002] After years of operation of rail transit, sleeper damage inevitably occurs in some sections. However, the maintenance time in rail transit is short, and maintenance can only be carried out during the night skylight points when the operation stops. At present, however, both sleepers and ballast beds are generally made of concrete structures. The maintenance of sleepers is bound to involve various operations such as concrete breaking and pouring, and the time-consuming of these operations is relatively long. Therefore, it is very difficult to complete sleeper repair or replacement during the night skylight points when rail transit stops operating. Summary of the Invention

[0003] The purpose of the utility model is to provide a sleeper structure for reconstructing existing subway lines according to the deficiencies of the above-mentioned existing technologies. By designing the structure of precast short sleepers, the precast short sleepers can be quickly connected to the existing ballast bed. After a certain number of the precast short sleepers are quickly constructed, the existing short sleepers can be removed to achieve the rapid reconstruction of sleepers in rail transit.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] A sleeper structure for reconstructing existing subway lines, characterized in that: it includes precast short sleepers, a long and narrow groove is opened on the precast short sleepers, holes are reserved at the bottom of the groove, a portal-shaped steel bar is inserted into the holes, and the portal-shaped steel bar is connected with the groove into an integral structure by pouring rapid-hardening mortar, and connection holes are reserved on the precast short sleepers.

[0006] The grooves are symmetrically arranged on both sides of the precast short sleepers, and the holes are reserved in both of the grooves on both sides.

[0007] The height of the portal-shaped steel bar meets the requirement that its top is lower than the surface of the precast short sleeper, and its bottom can extend into the existing ballast bed.

[0008] The positions and quantities of the connection holes on the precast short sleepers are adapted to fit the fastening system in the existing line.

[0009] The advantages of the utility model are: the structure is simple and reasonable. When applied to the reconstruction of existing subway lines, there is no need to dig out the existing short sleepers, only the concrete protective layer of the existing ballast bed needs to be chiseled, which does not affect the structural steel bars of the existing ballast bed, and the reconstruction workload is small; the connection between the short sleepers and the ballast bed is strengthened, the structural performance is guaranteed and the construction is convenient. Description of the Drawings

[0010] Figure 1This is the top view of the sleeper in the present utility model;

[0011] Figure 2 This is the structural schematic diagram of the portal-shaped steel bar in the present utility model;

[0012] Figure 3 This is the connection schematic diagram of the sleeper and the portal-shaped steel bar in the present utility model. Embodiment

[0013] The features of the present utility model and other related features are further described in detail below through embodiments with reference to the attached drawings for the understanding of those skilled in the same industry:

[0014] As Figures 1 - 3 shown, the marks 1-7 in the figure respectively represent: precast short sleeper 1, groove 2, insertion hole 3, connection hole 4, portal-shaped steel bar 5, drilling hole 6, ballast bed 7.

[0015] Embodiment: As Figures 1 to 3 shown, the sleeper structure for the renovation of the existing subway line in this embodiment includes a precast short sleeper 1 and a portal-shaped steel bar 5. The precast short sleeper 1 is used to replace the existing short sleeper of the ballast bed 7 of the existing rail transit line to realize the renovation of the existing subway line, while the portal-shaped steel bar 5 is mainly used to realize the connection between the precast short sleeper 1 and the ballast bed 7 of the existing rail transit line.

[0016] Specifically, as Figure 1 shown, two grooves 2 are symmetrically arranged on the precast short sleeper 1. The structures of these two grooves 2 are the same and meet the insertion requirements of the portal-shaped steel bar 5, that is, the shape and size of the groove body of the groove 2 are available for the insertion of the portal-shaped steel bar 5. Insertion holes 3 are respectively arranged at both ends of the two grooves 2, and the insertion holes 3 also match the shape and size of the portal-shaped steel bar 5, so that the two ends of the portal-shaped steel bar 5 can be respectively inserted into the corresponding insertion holes 3. Combining Figures 1 to 3 shown, the portal-shaped steel bar 5 can be inserted into the insertion hole 3 and is entirely located in the groove 2.

[0017] In this embodiment, a number of connection holes 4 are arranged on the surface of the precast short sleeper 1. The connection holes 4 are used to connect with the fastener system of the existing rail transit line, so as to fix the rail on the newly installed precast short sleeper 1.

[0018] When this embodiment is applied, it includes the following application methods:

[0019] 1) Chisel and roughen the concrete protective layer (generally 35-50 mm thick) of the ballast bed 7 between adjacent existing sleepers on the site of the existing rail transit line. When chiseling the concrete, the ballast bed steel bars are not affected.

[0020] 2) Place the prefabricated short sleeper 1 on the position of the roadbed 7 where the concrete protective layer has been chiseled off. Then, use an impact drill to drill into the roadbed to a certain depth through the four insertion holes 3 reserved on the prefabricated short sleeper 1 to form drill holes 6. The drill holes 6 are holes located within the roadbed 7 and are correspondingly connected to the insertion holes 3. Insert the U-shaped steel bars 5 into the insertion holes 3. The ends of the U-shaped steel bars 5 pass through the insertion holes 3 and extend into the drill holes 6.

[0021] In this embodiment, when designing the positions of the insertion holes 3, the existing steel bars within the roadbed 7 should be avoided according to the reinforcement drawing of the roadbed 7. Moreover, the diameter of the insertion holes 3 is larger than the diameter of the subsequent inserted U-shaped steel bars 5, so as to leave a certain gap between the insertion holes 3 and the U-shaped steel bars 5 to form a pouring space for the rapid-hardening mortar.

[0022] 3) Pour the rapid-hardening mortar into the groove 2 of the prefabricated short sleeper 1. The rapid-hardening mortar is poured through the groove 2 between the U-shaped steel bars 5 and the insertion holes 3, as well as between the U-shaped steel bars 5 and the drill holes 6. When the rapid-hardening mortar solidifies, the prefabricated short sleeper 1 and the roadbed 7 are connected into an integral structure.

[0023] In this embodiment, the rapid-hardening mortar not only fills the holes into which the U-shaped steel bars 5 are inserted, but also is poured to a certain height around the prefabricated short sleeper 1, thereby improving the structural stability and position accuracy of the prefabricated short sleeper 1, especially by limiting the prefabricated short sleeper 1 with the solidified rapid-hardening mortar.

[0024] 4) After constructing a certain number of prefabricated short sleepers 1 on the roadbed 7 along the direction of the rail transit line according to the methods of steps 1) to 3), the existing short sleepers can be removed, and the prefabricated short sleepers 1 can be put into use. The rails are connected to the connection holes 4 of the prefabricated short sleepers 1 through the fastening system to complete the installation and fixation of the rails.

[0025] In this embodiment, since the maintenance time of the rail transit during the skylight period is short, therefore, when it is necessary to transform the existing short sleepers in a long section within the existing line, batch construction of the prefabricated short sleepers 1 can be carried out on the premise of meeting the operation time requirements, that is, the prefabricated short sleepers 1 are divided into multiple construction batches, with each construction being carried out in a section area. After all the prefabricated short sleepers 1 are installed, the rails are installed and fixed, so as to avoid the adverse impact of the existing line transformation on the normal operation of the rail transit.

[0026] Although the above embodiments have described in detail the concept and embodiments of the purpose of the present invention with reference to the drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims, so they are not elaborated herein one by one.

Claims

1. A sleeper structure for the transformation of existing subway lines, characterized in that: It includes precast short tie plates. A long and narrow groove is formed on the precast short tie plate. Holes are reserved at the bottom of the groove. A portal-shaped steel bar is inserted into the holes. The portal-shaped steel bar is integrally connected with the groove by pouring rapid-hardening mortar. Connection holes are reserved on the precast short tie plate.

2. The sleeper structure for the transformation of existing subway lines according to claim 1, characterized in that: The grooves are symmetrically arranged on both sides of the precast short tie plate, and the holes are reserved in the grooves on both sides.

3. The sleeper structure for the renovation of existing subway lines according to claim 1, characterized in that: The height of the portal-shaped steel bar is such that its top is lower than the surface of the precast short tie plate, and its bottom can extend into the existing roadbed.

4. The sleeper structure for the renovation of existing subway lines according to claim 1, characterized in that: The positions and quantities of the connection holes on the precast short tie plate are adapted to fit the fastening system in the existing line.

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