Ballastless track bed constructed based on hardened ballast track bed
By forming a grouting hardened layer on the ballasted trackbed and strengthening the steel structure, combined with buffer parts, the rapid construction of the ballastless trackbed is achieved, solving the problems of large construction volume and high cost, and ensuring the efficiency and safety of construction.
Patent Information
- Application Number
- CN202422879825.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-26
AI Technical Summary
In the prior art, when a ballasted trackbed is replaced with a ballastless trackbed, the compacted layer of the ballasted trackbed needs to be removed, resulting in a large amount of construction work, extended construction period and increased costs.
On the basis of the ballasted track bed, a grouting hardened layer is formed by grouting the gaps in the gravel layer, and sleepers and rails are installed on it. The structure is strengthened with vertical and horizontal steel bars, and buffer pads and boot-type rubber buffers are used to improve the buffering capacity of the sleepers.
The construction workload is reduced, the construction period is shortened, and the construction cost is lowered, while the strength and buffering performance of the ballastless track bed are ensured.
Smart Images
Figure CN223409965U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of track construction, and in particular relates to a ballastless track bed constructed based on a compacted ballasted track bed. Background Art
[0002] At present, most ordinary passenger or freight train tracks have ballasted tracks, while most EMU and high-speed train tracks have ballastless tracks. In the planning of railway track transportation, it is necessary to replace part of the ballasted tracks with ballastless tracks to facilitate the operation of EMUs and high-speed trains. The existing construction method is to remove the sleepers and rails, then remove the ballasted track, and then cast the ballastless track according to the construction requirements of the ballastless track, and finally install the sleepers and rails. Due to the long-term operation of the ballasted track, a compacted layer gradually forms on the lower part of the ballasted track. This compacted layer is mainly a layered structure formed by fine gravel, fine sand, etc. gradually settling and filling the gaps between the gravel of the ballasted track. It has extremely high strength and is extremely troublesome to remove. As a result, the construction workload increases and the construction period is extended during the entire construction process. Utility Model Content
[0003] The utility model provides a ballastless track bed constructed based on a compacted ballasted track bed, which is used to reduce the amount of construction engineering work, shorten the construction period, and save construction costs.
[0004] In order to achieve the above purpose, the technical solutions adopted by the present utility model are as follows:
[0005] A ballastless track bed constructed based on a compacted ballasted track bed comprises a grouting hardening layer, a compacted layer and a base bed body arranged in sequence from top to bottom. Sleepers are installed on the grouting hardening layer at intervals along the length of the track, and two rails are installed side by side on these sleepers. The grouting hardening layer is a layered structure formed by grouting and hardening the gravel layer of the ballasted track bed, and the compacted layer is a dense layered structure formed by the settlement of fine particles below the gravel layer in the ballasted track bed.
[0006] Furthermore, vertical steel bars are arranged at intervals in the grouting hardening layer, and each of the vertical steel bars extends from the upper end of the grouting hardening layer into the compacted layer in a vertical direction.
[0007] Furthermore, transverse steel bars are arranged at intervals in the grouting hardening layer, and each of the transverse steel bars extends in the transverse direction of the grouting hardening layer to two opposite sides of the grouting hardening layer.
[0008] Furthermore, the lower end of the grouting hardened layer is evenly covered with extended bosses, the cross section of each extended boss is circular or regular polygonal, and the lower end of the extended boss extends from the upper end of the hardened layer into the hardened layer.
[0009] Furthermore, a buffer rubber pad is provided between the upper end surface of each sleeper and the lower end surfaces of the two rails.
[0010] Furthermore, the thickness of the buffer rubber pad is 6mm-10mm, and the buffer rubber pad is a pad-shaped structure made of EPDM rubber.
[0011] Furthermore, each of the sleepers is assembled in a boot-type rubber buffer, which covers the bottom wall and the outer peripheral wall of the sleeper. The boot-type rubber buffer is a boot-shaped structure made of EPDM rubber.
[0012] Furthermore, the boot-type rubber buffer includes a boot body, which is a semi-enclosed structure with its upper end in an open state. It has a bottom buffer wall, side buffer walls are formed on both sides of the bottom buffer wall, and end buffer walls are formed at both ends of the bottom buffer wall. When the sleeper is assembled in the boot-type rubber buffer, the lower end surface of the sleeper is in elastic contact with the upper end surface of the bottom buffer wall, and the middle parts of the two side walls of the sleeper are located between the two side buffer walls, and the middle parts of the two end walls of the sleeper are located between the two end buffer walls.
[0013] Furthermore, the thickness of the bottom buffer wall is 6mm-12mm, the thickness of the side buffer wall is 4mm-9mm, and the thickness of the end buffer wall is 4mm-9mm.
[0014] Since the present invention adopts the above-mentioned structure, the technical progress achieved compared with the prior art is as follows: the present invention is based on the original ballasted track bed, and there is no need to remove the entire ballasted track bed before constructing the ballastless track bed, which greatly reduces the amount of engineering work for the entire construction, and the strength of the resulting ballastless track bed reaches the expected value, and there is no need to invest too much additional construction materials, which greatly reduces the investment in building materials and thus reduces the construction cost. Specifically, the present invention hardens the gravel layer above the compacted layer in the ballasted track bed, that is, injects hardening slurry into the gravel layer so that the hardening slurry fills the gaps between the gravels until it is finally hardened, so that the gravel layer becomes a grouting hardening layer. The grouting hardening layer cooperates with the compacted layer to finally form the upper part of the base bed of the ballastless track bed and ensures the overall strength of the ballastless track bed. After the grouting hardening layer is hardened, the sleepers and rails are installed and fixed on the grouting hardening layer in sequence. In summary, the present invention can effectively reduce the amount of construction work, shorten the construction period, and save construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.
[0016] In the attached figure:
[0017] Figure 1 This is a cross-sectional view of the structure of a buffer rubber pad provided between the sleeper and the rail according to an embodiment of the utility model;
[0018] Figure 2 This is a cross-sectional view of the structure of the embodiment of the utility model, in which the grouting hardening layer is provided with vertical steel bars and the sleepers are assembled in the shoe-type rubber buffer;
[0019] Figure 3 This is a cross-sectional view of the transverse structure of the embodiment of the utility model, in which the grouting hardening layer is provided with transverse reinforcement and the sleeper is assembled in the boot-type rubber buffer;
[0020] Figure 4 This is a schematic diagram of the structure of the embodiment of the utility model in which the grouting hardening layer is provided with horizontal steel bars, vertical steel bars and sleepers assembled in the boot-type rubber buffer;
[0021] Figure 5 This is a schematic structural diagram of a boot-type rubber buffer according to an embodiment of the present invention.
[0022] Labeled parts: 100-foundation bed, 200-hardened layer, 300-grouting hardened layer, 301-layered body, 302-vertical steel bars, 303-transverse steel bars, 304-extended boss, 400-sleeper, 500-rail, 600-buffer pad, 700-boot-type rubber buffer, 701-boot body, 702-side buffer wall, 703-end buffer wall, 704-bottom buffer wall. DETAILED DESCRIPTION
[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.
[0024] The utility model discloses a ballastless track bed constructed based on a compacted ballasted track bed. Figure 1-4As shown, it includes a grouting hardening layer 300, a compacted layer 200 and a base bed 100 arranged in sequence from top to bottom. On the grouting hardening layer 300, sleepers 400 are installed at intervals along the length direction of the track, and two rails 500 are installed side by side on these sleepers 400. Among them, the grouting hardening layer 300 is a layered structure formed by grouting and hardening the gravel layer of the ballasted trackbed, and the compacted layer 200 is a dense layered structure formed by the sedimentation of fine particles below the gravel layer in the ballasted trackbed. The working principle and advantages of the present invention are: the present invention is based on the original ballasted trackbed, and there is no need to remove the ballasted trackbed as a whole before constructing the ballastless trackbed, which greatly reduces the amount of engineering work for the entire construction, and the strength of the obtained ballastless trackbed reaches the expected value, and there is no need to invest too much additional construction materials, which greatly reduces the investment in building materials and thus reduces construction costs. Specifically, the present invention hardens the gravel layer above the compacted layer 200 in the ballasted track bed, that is, injects hardening slurry into the gravel layer so that the hardening slurry fills the gaps between the gravels until it is finally hardened, so that the gravel layer becomes a grouting hardening layer 300. The grouting hardening layer 300 cooperates with the compacted layer 200 to ultimately form the upper portion of the base bed 100 of the ballastless track bed and ensure the overall strength of the ballastless track bed. After the grouting hardening layer 300 has hardened, the sleepers 400 and the rails 500 are sequentially installed and fixed on the grouting hardening layer 300. In summary, the present invention can effectively reduce the amount of construction work, shorten the construction period, and save construction costs.
[0025] As a preferred embodiment of the present invention, in order to improve the strength of the grouting hardening layer 300 and improve the connection strength between the grouting hardening layer 300 and the hardened layer 200, the measures taken are as follows: Figure 2 、 4 As shown, the grouting hardening layer 300 includes a layered body 301, in which vertical steel bars 302 are arranged at intervals. Each vertical steel bar 302 extends vertically from the upper end of the grouting hardening layer 300 into the hardened layer 200. In order to further enhance the strength of the grouting hardening layer 300, as shown in FIG. Figure 3 、 4 As shown, transverse reinforcement bars 303 are arranged at intervals within the grouting hardened layer 300, and each transverse reinforcement bar 303 extends transversely to two opposite sides of the grouting hardened layer 300. During the hardening process after grouting, each transverse reinforcement bar 303 can be pre-tensioned according to a predetermined tensioning force until the layered body 301 is completely hardened, at which time the pre-tensioning of the transverse reinforcement bar 303 is released.
[0026] As a preferred embodiment of the present invention, in order to strengthen the connection strength between the grouting hardening layer 300 and the hardened layer 200, the measures taken are as follows: Figure 3 、 4As shown, the gravel layer is drilled at intervals so that the lower end of each drilled hole extends to the upper portion of the compacted layer 200. A grouting pipe is then inserted into the hole and grouting is performed. When the grouting is nearing completion, the grouting pipe is pulled upward while continuing to grout until the hole is filled with liquefied slurry. After hardening, the lower end of the grouting hardened layer 300 is evenly covered with extended bosses 304. Each extended boss 304 has a circular or regular polygonal cross-section, and the lower end of the extended boss extends from the upper end of the compacted layer 200 into the compacted layer 200.
[0027] As a preferred embodiment of the present invention, since the ballasted track bed has a buffering capacity, while the ballastless track bed does not have a buffering capacity, in order to ensure a certain buffering capacity between the motor vehicle or high-speed rail and the track to ensure the safety of driving, the measures taken are as follows: Figure 1 As shown, a method of providing a buffering capacity between the sleeper 400 and the rail 500 is adopted. Specifically, a buffering rubber pad 600 is provided between the upper end surface of each sleeper 400 and the lower end surfaces of the two rails 500. The thickness of the buffering rubber pad 600 is generally 6mm-10mm, and the buffering rubber pad 600 is a pad-shaped structure processed from EPDM rubber, which makes it have better buffering capacity and extremely long service life. This embodiment can also adopt another means for buffering, that is, a method of providing a buffering capacity between the sleeper 400 and the ballastless roadbed. Specifically, as Figure 2-4 As shown, each sleeper 400 is assembled in a boot-type rubber buffer 700, which covers the bottom wall and outer peripheral wall of the sleeper 400. The boot-type rubber buffer 700 is a boot-shaped structure made of EPDM rubber. In this way, the lower part and bottom of the sleeper 400 are covered, so that the sleeper 400 has better buffering performance with the ballastless track bed. The specific structure of the boot-type rubber buffer 700 in this embodiment is as follows: Figure 5As shown, the boot-type rubber buffer 700 includes a boot body 701. The boot body 701 is a semi-enclosed structure with an open upper end. The boot body 701 has a bottom buffer wall 704, with side buffer walls 702 formed on both sides of the bottom buffer wall 704, and end buffer walls 703 formed on both ends of the bottom buffer wall 704. When the lower portion of the sleeper 400 is assembled in the boot-type rubber buffer 700, the lower end surface of the sleeper 400 elastically contacts the upper end surface of the bottom buffer wall 704. The middle portions of the two side walls of the sleeper 400 are located between the two side buffer walls 702, and the middle portions of the two end walls of the sleeper 400 are located between the two end buffer walls 703. This ensures that the lower portion of the sleeper 400 has good buffering capacity. In addition, when the lower portion of the sleeper 400 is subjected to a lateral or end collision, the side buffer walls 702 or the end buffer walls 703 can effectively absorb external forces. In this embodiment, the bottom buffer wall 704 has a thickness of 6mm-12mm, the side buffer wall 702 has a thickness of 4mm-9mm, and the end buffer wall 703 has a thickness of 4mm-9mm. Within the above numerical ranges, the boot-type rubber buffer 700 has excellent buffering performance and a service life that meets the expected value.
[0028] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. A ballastless track bed constructed based on a compacted ballasted track bed, characterized in that: It includes a grouting hardening layer, a compacted layer and a foundation bed arranged in sequence from top to bottom. Sleepers are installed at intervals on the grouting hardening layer along the length of the track. Two rails are installed side by side on these sleepers. The grouting hardening layer is a layered structure formed by grouting and hardening the gravel layer of the ballasted trackbed. The compacted layer is a dense layered structure formed by the settlement of fine particles below the gravel layer in the ballasted trackbed.
2. The ballastless track bed constructed based on a compacted ballasted track bed according to claim 1, characterized in that: Vertical steel bars are arranged at intervals in the grouting hardening layer, and each of the vertical steel bars extends from the upper end of the grouting hardening layer into the compacted layer in a vertical direction.
3. The ballastless track bed constructed based on a compacted ballasted track bed according to claim 1, characterized in that: Transverse steel bars are arranged at intervals in the grouting hardening layer, and each of the transverse steel bars extends to two opposite sides of the grouting hardening layer in the transverse direction of the grouting hardening layer.
4. The ballastless track bed constructed based on a compacted ballasted track bed according to claim 1, characterized in that: The lower end of the grouting hardening layer is evenly covered with extended bosses, the cross section of each extended boss is circular or regular polygonal, and the lower end of the extended boss extends from the upper end of the hardened layer into the hardened layer.
5. The ballastless track bed constructed based on a compacted ballasted track bed according to claim 1, characterized in that: Buffer rubber pads are respectively provided between the upper end surface of each sleeper and the lower end surfaces of the two rails.
6. The ballastless track bed constructed based on the compacted ballasted track bed according to claim 5, characterized in that: The thickness of the buffer rubber pad is 6mm-10mm, and the buffer rubber pad is a pad-shaped structure made of EPDM rubber.
7. The ballastless track bed constructed based on a compacted ballasted track bed according to claim 1, characterized in that: Each of the sleepers is assembled in a boot-type rubber buffer, which covers the bottom wall and the outer peripheral wall of the sleeper. The boot-type rubber buffer is a boot-shaped structure made of EPDM rubber.
8. The ballastless track bed constructed based on the compacted ballasted track bed according to claim 7, characterized in that: The boot-type rubber buffer includes a boot body, which is a semi-enclosed structure with its upper end in an open state. It has a bottom buffer wall, side buffer walls are formed on both sides of the bottom buffer wall, and end buffer walls are formed at both ends of the bottom buffer wall. When the sleeper is assembled in the boot-type rubber buffer, the lower end surface of the sleeper is in elastic contact with the upper end surface of the bottom buffer wall, and the middle parts of the two side walls of the sleeper are located between the two side buffer walls, and the middle parts of the two end walls of the sleeper are located between the two end buffer walls.
9. The ballastless track bed constructed based on the compacted ballasted track bed according to claim 8, characterized in that: The thickness of the bottom buffer wall is 6mm-12mm, the thickness of the side buffer wall is 4mm-9mm, and the thickness of the end buffer wall is 4mm-9mm.