Thin short sleeper

Abstract

The utility model relates to the field of track beds of urban rail transit, in particular to a thin short sleeper which comprises sleeper blocks, at least two door-shaped anchoring ribs and three-dimensional grid weaving cloth, one part of each door-shaped anchoring rib is arranged in the corresponding sleeper block, and the other part of each door-shaped anchoring rib is arranged on a mortar layer. The number of the three-dimensional grid woven fabrics is two, and the two three-dimensional grid woven fabrics are horizontally arranged in the sleeper blocks. The number of the self-locking anchor rods is two, and the self-locking anchor rods are inserted into the anchor rod holes of the sleeper blocks so as to be connected with the mortar layer. The door-shaped anchoring ribs and the three-dimensional grid woven cloth are arranged in the sleeper blocks, so that the compressive strength and the breaking strength of the sleeper are improved; moreover, the sleeper blocks are connected in an inserted mode through the self-locking anchor rods, the connecting performance of the sleeper, cast-in-place mortar and an existing ballast bed structure is enhanced, the construction workload is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of ballast beds for urban rail transit, and more specifically, to a thin short sleeper. Background Art

[0002] In the early days, trackless sleeper ballast beds were mostly adopted in urban rail transit. In this design, the fastener sleeves were directly buried in the cast-in-place concrete ballast bed. Under the long-term action of trains, diseases such as cavities, pulverization, and fragmentation would occur in the ballast bed concrete, resulting in a poor stress state of the ballast bed foundation, easy breakage of the spiral spikes, and a large number of continuous breakages at the anchor bolt holes of the fastener tie plates. Due to the lack of precise and stable support platforms, the cast-in-place concrete was affected by on-site conditions, and the tamping under the fasteners was not dense, resulting in defects such as insufficient strength of the fastener support surface and uneven ballast bed surface. After years of operation, the diseases of the concrete under the rail further reduced the integrity and strength of the track, weakened the bearing capacity of the ballast bed, caused track unevenness, and seriously affected the safety and stability of train operation. In addition, insufficient anti-pulling force of the anchor bolts might cause the bolts to jump out and hit the running vehicles, endangering the safety of train operation. The existing renovation method is to renovate with ordinary short sleepers. Since the thickness of the sleeper is relatively large, the upper layer of steel bars in the ballast bed needs to be cut off, and the stray current steel ring is welded to the disconnected longitudinal bars in the upper layer. This leads to a large amount of on-site welding work, many cutting surfaces, and many new and old concrete bonding surfaces, with poor aesthetics. If the construction quality control is not strict, diseases are likely to occur. Therefore, a new type of ballast bed structure for rail transit is needed to solve the above problems. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a new type of ballast bed for rail transit to improve the above problems. To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0004] The present application provides a thin short sleeper, including: a sleeper block, U-shaped anchor bars, and a three-dimensional grid fabric. At least two U-shaped anchor bars are provided. A part of the U-shaped anchor bars is arranged inside the block, and the other part is arranged in the mortar layer; two three-dimensional grid fabrics are provided, and both are horizontally arranged inside the sleeper block; two self-locking anchor bolts are provided, and the self-locking anchor bolts are inserted into the anchor bolt holes of the sleeper block to connect with the mortar layer.

[0005] Optionally, for the two three-dimensional grid fabrics, one of the three-dimensional grid fabrics is horizontally arranged at a distance of 2-5 mm from the top surface of the sleeper block, and the other three-dimensional grid fabric is horizontally arranged at a distance of 2-5 mm from the bottom surface of the sleeper block.

[0006] Optionally, the portal-shaped anchor bar includes two anchor bar legs and an anchor bar cross beam. The anchor bar cross beam is horizontally arranged along the width direction of the sleeper block. The two anchor bar legs are parallel and respectively perpendicular to the two ends of the anchor bar cross beam. The top ends of the two anchor bar legs are respectively welded to the two ends of the anchor bar cross beam. The bottom ends of the anchor bar legs are provided with bending sections extending inwards.

[0007] The beneficial effects of the present utility model are as follows:

[0008] By arranging a portal-shaped anchor bar and a three-dimensional grid fabric structure inside the thin short sleeper, the present utility model patent enhances the compressive and flexural resistance of the sleeper, improves the overall strength of the roadbed, reduces the potential safety hazards during train operation, improves the train operation safety, and the transformation of the thin short sleeper avoids cutting the upper steel bars. Using self-locking anchor bolts and bolts for connection and fixation not only maintains the integrity and structural stability of the roadbed, improves the bearing capacity and durability of the transformed roadbed, but also simplifies the construction steps, shortens the construction period, and improves the construction efficiency.

[0009] Other features and advantages of the present utility model will be described in the subsequent description. Moreover, some of them will become apparent from the description or can be understood by implementing the embodiments of the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0011] Figure 1 It is the front view of the thin short sleeper structure described in the embodiments of the present utility model.

[0012] Figure 2 It is the left view of the thin short sleeper structure described in the embodiments of the present utility model.

[0013] Figure 3 It is the top view of the thin short sleeper structure described in the embodiments of the present utility model.

[0014] Figure 4 It is the installation schematic diagram of the thin short sleeper described in the embodiments of the present utility model.

[0015] Markings in the drawing: 1, sleeper block; 2, three-dimensional grid fabric; 3, portal anchor bar; 4, longitudinal structural steel bar; 5, transverse structural steel bar; 6, anchor bolt hole; 7, sleeve hole; 8, exhaust hole; 9, self-locking anchor bolt; 10, bolt; 11, mortar layer. Detailed implementation mode

[0016] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present utility model, the terms "first", "second", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0018] Embodiment 1

[0019] See Figure 1 As shown, this embodiment provides a thin short sleeper, including: a sleeper block 1, a portal anchor bar 3 and a three-dimensional grid fabric 2, at least one portal anchor bar. See Figure 2 And Figure 4 As shown, the portal anchor bar 3 is arranged in the sleeper block 1 and the end of the portal anchor bar 3 extends into the mortar layer 11. The setting specifications of the portal anchor bar in the mortar layer 11 are: the length of the bent section is 50 mm and the length of the vertical section is 70 mm; two three-dimensional grid fabrics 2 are provided and both are horizontally arranged in the sleeper block 1. See Figure 3 As shown, at least two transverse structural steel bars 5 and at least two longitudinal structural steel bars 4 are further arranged in the sleeper block 1, and the transverse structural steel bars 5 and the longitudinal structural steel bars 4 are arranged crosswise; an exhaust hole 8 is further arranged on the sleeper block 1, and the exhaust hole 8 is located in the middle of the top surface of the sleeper block 1.

[0020] It can be understood that in this step, in addition to the transverse structural steel bars 5 and the longitudinal structural steel bars 4 provided in the sleeper block 1, portal anchor bars 3 and a three-dimensional grid fabric 2 are also provided, which enhances the compressive and flexural resistance of the sleeper block 1, improves the overall strength of the roadbed, reduces the potential safety hazards during train operation, and improves the driving safety.

[0021] Among them, the portal anchor bar 3 includes two anchor bar legs and an anchor bar cross beam. The anchor bar cross beam is horizontally arranged along the width direction of the sleeper block 1. The two anchor bar legs are parallel and respectively perpendicular to the two ends of the anchor bar cross beam. The top ends of the two anchor bar legs are respectively welded to the two ends of the anchor bar cross beam. The bottom end of the anchor bar leg is provided with a bent section extending inwards. Among them, the anchor bar cross beam is arranged 103 mm away from the side surface of the sleeper block 1, and the distance between two adjacent anchor bar cross beams is 170 mm. However, due to the width limitation of the sleeper block 1, the distance between two adjacent anchor bar cross beams in the middle is 160 mm. The two anchor bar legs are parallel and respectively perpendicular to the two ends of the anchor bar cross beam. The top ends of the two anchor bar legs are respectively welded to the two ends of the anchor bar cross beam. The bent section of the anchor bar leg is 50 mm.

[0022] A three-dimensional grid fabric 2 is provided in the sleeper block 1. Among them, the number of the three-dimensional grid fabrics 2 is two, and specifically, it is a 12-mm-thick basalt three-dimensional grid fabric. One of the three-dimensional grid fabrics 2 is horizontally arranged 2 - 5 mm away from the top surface of the sleeper block 1, and the other three-dimensional grid fabric 2 is horizontally arranged 2 - 5 mm away from the bottom surface of the sleeper block 1.

[0023] Among them, at least two transverse structural steel bars 5 and at least two longitudinal structural steel bars 4 are further provided in the sleeper block 1. The transverse structural steel bars 5 are arranged along the width direction of the sleeper block 1, and the longitudinal structural steel bars 4 are arranged along the length direction of the sleeper block 1. Specifically, the left and right sides of the transverse structural steel bars 5 are respectively arranged 25 mm away from the side surface of the sleeper block 1, and the distance between two adjacent transverse structural steel bars 5 is 100 mm. However, due to the width limitation of the anchor hole 6 and the sleeve hole 7, the distance between two adjacent transverse structural steel bars 5 adjacent to the two anchor holes 6 is 75, and the distance between two adjacent transverse structural steel bars 5 adjacent to the two sleeve holes 7 is 90; the left and right sides of the longitudinal structural steel bars 4 are respectively arranged 20 mm away from the side surface of the sleeper block 1, and the distance between two adjacent longitudinal structural steel bars 4 is 50 mm. However, due to the width limitation of the anchor hole 6 and the sleeve hole 7, the distance between two adjacent longitudinal structural steel bars 4 in the middle is 80 mm. The transverse structural steel bars 5 and the longitudinal structural steel bars 4 are arranged crosswise and the transverse structural steel bars 5 are welded to the longitudinal structural steel bars 4. The materials of the longitudinal structural steel bars 4 and the transverse structural steel bars 5 are HRB400 grade steel bars.

[0024] Optionally, it further includes two self-locking anchor bolts 9. Two anchor bolt holes 6 are provided on the sleeper block 1. The self-locking anchor bolts 9 are inserted into the anchor bolt holes 6 and connected to the mortar layer 11. The aperture of the anchor bolt hole 6 is 24 mm. Moreover, a blind hole with a depth of 10 mm and an aperture of 60 mm is provided on the sleeper block 1 and connected to the anchor bolt hole 6. The specification of the self-locking anchor bolt 9 is 300 mm in length and 12 mm in diameter.

[0025] Optionally, an exhaust hole 8 is further provided on the sleeper block 1, with a specific aperture of 20 mm. The exhaust hole 8 is located in the middle of the top surface of the sleeper block 1.

[0026] Optionally, two sleeve holes 7 are further provided on the sleeper block 1. The two sleeve holes 7 are provided between the anchor bolt hole 6 and the exhaust hole 8 respectively. Specifically, the centers of the sleeve holes 7 are horizontally spaced 485 mm apart and symmetrically arranged left and right inside the sleeper block 1.

[0027] Optionally, it further includes two bolts 10. The two bolts 10 are respectively connected to the mortar layer 11 through the two sleeve holes 7. Specifically, the upper part of the bolt 10 is 60 mm long and arranged inside the sleeper block 1, and the rest is arranged inside the mortar layer 11.

[0028] It can be understood that using the self-locking anchor bolts 9 and bolts 10 for connection and fixation in this step not only maintains the integrity and structural stability of the ballast bed, improves the bearing capacity and durability of the ballast bed after transformation, but also simplifies the construction steps, shortens the construction period, and improves the construction efficiency.

[0029] Optionally, the shape of the sleeper block 1 is a frustum of a quadrangular pyramid, and its material is RPC140 grade reactive powder concrete. The specific specification is a frustum of a quadrangular pyramid with a length of 680 mm and a width of 220 mm on the upper surface, and a length of 706 mm and a width of 235 mm on the lower bottom surface.

[0030] It can be understood that using RPC140 grade reactive powder concrete for the sleeper block 1 enables the compressive strength of the sleeper block 1 to be ≥140 MPa and the flexural strength to be ≥18 MPa. This means that its volume change during hardening and long-term use is small, which helps to maintain the structural stability and accuracy.

[0031] Optionally, the sleeper block 1 is arranged on the mortar layer 11. The mortar layer uses rapid repair mortar, and its specific specification is 120 - 150 mm in depth and 780 - 810 mm in width.

[0032] Specific construction method:

[0033] The first step (the first day): During the time of the maintenance window, remove the original fasteners and rails to prepare for the subsequent transformation work.

[0034] Among them, the skylight point time is 3 hours, and the effective skylight time is 2.5 hours.

[0035] The second step (the first day): Chisel a groove on the roadbed for placing the sleeper block 1. Specifically, chisel the roadbed around the rail with a depth of 120 - 150 mm and a length of 780 - 810 mm while retaining the steel bars in the upper layer of the roadbed to maintain the integrity and structural stability of the roadbed.

[0036] The third step (the first day): Insert construction steel bars at the bottom and sides of the chiseled groove to enhance the connection between the new and old structures.

[0037] The fourth step (the first day): Drill anchor holes 6 at both ends of the sleeper block 1 and install self-locking anchor bolts 9 to ensure the firm connection between the sleeper block 1 and the roadbed.

[0038] The fifth step (the first day): Before installing the sleeper block 1, temporary support for the fasteners is required to ensure stability during construction.

[0039] The sixth step (the second day): Place the sleeper block 1 into the groove and install fasteners and side forms. The side forms are used to maintain the shape during subsequent mortar pouring.

[0040] The seventh step (the second day): Pour rapid repair mortar around the sleeper block 1 to form a mortar layer 11 to fix the sleeper block 1 and fill the voids.

[0041] The eighth step (the second day): After the mortar layer 11 cures, remove the temporarily supported fastener pads and install gauge tie bars to adjust and fix the spacing between each sleeper block 1.

[0042] The ninth step (the second day): Grind and renovate the surface of the roadbed to ensure the smoothness and aesthetics of the roadbed.

[0043] The tenth step: Finally, restore the fasteners to their normal working state to complete the entire renovation process.

[0044] Among them, the construction process is arranged to complete a full working cycle every two days, and in every four construction cycles, one cycle is dedicated to removing the old road surface, tracks, and other structures.

[0045] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0046] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A thin short sleeper, characterized in that: A sleeper block (1), the sleeper block (1) is arranged on a mortar layer (11), and a three-dimensional grid fabric (2) is arranged in the sleeper block (1); At least one U-shaped anchor bar (3), the U-shaped anchor bar (3) is arranged in the sleeper block (1) and the end of the U-shaped anchor bar (3) extends into the mortar layer (11).

2. The thin short sleeper according to claim 1, wherein: The U-shaped anchor bar (3) includes two anchor bar legs and an anchor bar cross beam. The anchor bar cross beam is horizontally arranged along the width direction of the sleeper block (1). The two anchor bar legs are parallel and respectively perpendicular to both ends of the anchor bar cross beam. The top ends of the two anchor bar legs are respectively welded to both ends of the anchor bar cross beam. The bottom ends of the anchor bar legs are provided with bent sections extending inwards.

3. The thin short sleeper according to claim 1, characterized in that: The number of the three-dimensional grid fabrics (2) is two. One of the three-dimensional grid fabrics (2) is horizontally arranged at a position 2-5 mm away from the top surface of the sleeper block (1), and the other three-dimensional grid fabric (2) is horizontally arranged at a position 2-5 mm away from the bottom surface of the sleeper block (1).

4. The thin short sleeper according to claim 1, characterized in that: At least two transverse structural steel bars (5) and at least two longitudinal structural steel bars (4) are further arranged in the sleeper block (1), and the transverse structural steel bars (5) and the longitudinal structural steel bars (4) are arranged in a crosswise manner.

5. The thin short sleeper according to claim 4, characterized in that: The transverse structural steel bars (5) are arranged along the width direction of the sleeper block (1), and the longitudinal structural steel bars (4) are arranged along the length direction of the sleeper block (1).

6. The thin short sleeper according to claim 1, characterized in that: It further includes two self-locking anchor bolts (9). Two bolt holes (6) are arranged on the sleeper block (1), and the self-locking anchor bolts (9) are inserted into the bolt holes (6) and connected to the mortar layer (11).

7. The thin short sleeper according to claim 6, characterized in that: An exhaust hole (8) is formed in the top surface of the sleeper block (1), and the exhaust hole (8) is located in the middle of the top surface of the sleeper block (1).

8. The thin short sleeper according to claim 7, characterized in that: Two sleeve holes (7) are further arranged on the sleeper block (1), and the two sleeve holes (7) are arranged between the bolt holes (6) and the exhaust hole (8) respectively where the exhaust hole (8) is located.

9. The thin short sleeper according to claim 8, characterized in that: It further includes two bolts (10), and the two bolts (10) are respectively connected to the mortar layer (11) through the two sleeve holes (7).

10. The thin short sleeper according to claim 1, characterized in that: The shape of the sleeper block (1) is a frustum of a quadrangular pyramid.

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