Repair structure for damage of retaining shoulder of concrete sleeper of existing railway line

Abstract

The utility model relates to a repairing structure for a damaged part of a retaining shoulder of a concrete sleeper of an existing railway line, which comprises a reinforcing embedded steel bar reinforcing layer which comprises one or more steel bar groups, one part of each steel bar group is embedded and fixed in a base layer of the concrete sleeper of the railway line at the damaged part, and the other part of each steel bar group is embedded and fixed in the retaining shoulder of the concrete sleeper of the railway line. The plane where the steel bar sets are located is perpendicular to the ground and the extending direction of the sleeper. The sleeper shoulder repairing layer covers the reinforcing embedded steel bar reinforcing layer, is tightly bonded with the railway concrete sleeper base layer at the damaged part and recovers the profile of the original sleeper shoulder; and the sleeper surface protection layer is arranged on the sleeper shoulder repair layer. According to the technical scheme provided by the utility model, multiple integral protection on the damage of the retaining shoulder of the concrete sleeper of the existing railway line can be realized, the effects of supporting and fixing a track can be better exerted, the occurrence of the damage can be effectively prevented, and an excellent repairing effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of railway transportation engineering technology, and in particular relates to a repair structure for damaged concrete sleeper shoulders on existing railway lines. Background Technology

[0002] Railway sleepers are a crucial component of railway lines, playing a vital role in supporting and securing the track. Their performance directly impacts the safety and comfort of the railway line. In recent years, with the increasing service life of railway lines, the growing operational load, and environmental disturbances, existing railway lines' concrete sleepers have experienced various defects due to the long-term friction, impact, and repeated rolling of heavy-load trains. Among these, damage to the concrete sleeper shoulders is the most common and prevalent.

[0003] Damage to the shoulders of concrete sleepers on existing railway lines often manifests as cracking and spalling at the shoulder area. If this damage is not addressed promptly and effectively, it will seriously affect railway safety. Therefore, to ensure the safe operation of existing railway lines, it is necessary to repair damaged concrete sleeper shoulders in a timely and effective manner. Current repair methods for damaged concrete sleeper shoulders mostly involve using epoxy resin mortar or polymer repair mortar. While these methods have some repair effect, they focus on filling the damaged area without systematically studying and addressing the overall structural stress on the sleeper shoulder and the sleeper itself, resulting in unsatisfactory long-term effects.

[0004] Therefore, it is of great significance to provide a repair structure for damaged concrete sleeper shoulders on existing railway lines that can achieve good repair results and better serve the functions of sleeper shoulders in supporting and fixing the track after repair. Utility Model Content

[0005] The main objective of this invention is to provide a repair structure for damaged concrete sleeper shoulders on existing railway lines. The technical problem to be solved is how to provide a repair structure for damaged concrete sleeper shoulders on existing railway lines. This repair structure is easy to construct, the repaired part forms an integral force-bearing structure with the existing sleeper, the repair effect is good, and after repair, the sleeper shoulder can better play its role in supporting and fixing the track. It also has high construction efficiency and is therefore more suitable for practical use.

[0006] The purpose of this utility model and the technical problem it solves are achieved by the following technical solution. A repair structure for damaged concrete sleeper shoulders on existing railway lines, according to this utility model, comprises:

[0007] The reinforcement layer includes one or more steel bar groups, a portion of which is embedded and fixed in the railway concrete sleeper base layer at the damaged site. The plane of the steel bar group is perpendicular to the ground and perpendicular to the extension direction of the sleeper.

[0008] The sleeper shoulder repair layer covers the aforementioned reinforcing and rebar reinforcement layer, and is tightly bonded to the aforementioned railway concrete sleeper base layer at the damaged site to restore the original sleeper shoulder profile.

[0009] A protective layer for the sleeper surface is provided on the aforementioned sleeper shoulder repair layer.

[0010] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0011] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, the reinforcing rebar reinforcement layer is embedded to a depth of 90-110 mm into the aforementioned railway concrete sleeper base layer; and / or, the distance between the aforementioned rebar groups is 40-60 mm; and / or, the diameter of the rebars in the aforementioned rebar groups is 6-8 mm.

[0012] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, the steel reinforcement group consists of vertical steel bars perpendicular to the ground plane and horizontal steel bars perpendicular to the aforementioned vertical steel bars; the aforementioned vertical steel bars and the aforementioned horizontal steel bars are fixedly connected.

[0013] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, one or both ends of the transverse reinforcing bars are bent toward the ground.

[0014] Preferably, in the aforementioned repair structure for the damaged shoulder of the concrete sleeper of the existing railway line, in one of the aforementioned steel reinforcement groups, there are two vertical steel reinforcements and one horizontal steel reinforcement, and the top of the aforementioned horizontal steel reinforcement is fixedly connected to the top of the two aforementioned vertical steel reinforcements.

[0015] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, the spacing of the aforementioned vertical reinforcing bars in one of the aforementioned reinforcing bar groups is 40-60mm.

[0016] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, the steel reinforcement assemblies are fixed to the aforementioned railway concrete sleeper base layer using track spike anchoring agent.

[0017] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, the material of the sleeper shoulder repair layer is a special repair material for sleepers.

[0018] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders on existing railway lines, the material of the protective layer on the sleeper surface is a flexible concrete protective coating.

[0019] Preferably, in the aforementioned repair structure for damaged concrete sleeper shoulders of existing railway lines, the thickness of the protective layer on the sleeper surface is 80–120 μm.

[0020] By employing the above technical solution, the repair structure for damaged concrete sleeper shoulders on existing railway lines proposed in this utility model has at least the following advantages:

[0021] This utility model proposes a repair structure for damaged concrete sleeper shoulders on existing railway lines, which consists of a reinforcing rebar layer, a sleeper shoulder repair layer, and a sleeper surface protective layer. The reinforcing rebar layer strengthens the concrete's constraint through one or more steel bars embedded and fixed to the damaged area of ​​the concrete sleeper base layer, allowing the repaired shoulder to form an integral load-bearing structure with the existing concrete sleeper, thus improving the sleeper's overall load-bearing capacity. The sleeper shoulder repair layer, through tight bonding with the sleeper's concrete base layer and restoration of the original sleeper shoulder profile, and in synergy with the reinforcing rebar layer, re-forms itself into a unified whole with the sleeper base layer, better fulfilling its role in supporting, fixing, and protecting the track. The sleeper surface protective layer effectively prevents environmental erosion of the sleeper, improving its durability and extending its service life. This utility model provides multi-layered overall protection for damaged concrete sleeper shoulders on existing railway lines, better fulfilling its role in supporting and fixing the track, and effectively preventing the occurrence of damage, resulting in excellent repair effects.

[0022] Furthermore, the construction of the sleeper shoulder repair layer can adopt a self-leveling pouring process, which avoids the possibility that manual repair may cause the repair area to be not dense and the local cavity inside to affect the load-bearing capacity of the repair structure.

[0023] Furthermore, the repair structure of this utility model for damaged concrete sleeper shoulders on existing railway lines uses sleeper repair materials with fast setting time and high strength. It can be completed within the maintenance window, so it does not affect the normal operation of trains and has the advantage of simple construction.

[0024] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure for repairing damaged concrete sleeper shoulders on existing railway lines, according to some embodiments of this utility model.

[0026] Figure 2 This is a schematic diagram of the cross-sectional arrangement of the reinforcing rebar reinforcement layer in some embodiments of this utility model;

[0027] Figure 3 This is a schematic diagram of the steel reinforcement planar arrangement of the reinforcing bar reinforcement layer in some embodiments of this utility model;

[0028] Among them, 1-railway concrete sleeper base layer; 2-reinforcing and anchoring reinforcement layer; 3-sleeper shoulder repair layer; 4-sleeper surface protective layer. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a repair structure for carbonation defects in reinforced concrete bridges of existing railway lines proposed according to this utility model. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0030] This utility model proposes a repair structure for damaged concrete sleeper shoulders on existing railway lines, such as... Figure 1-3 As shown, it includes:

[0031] The reinforcement layer 2 includes one or more steel bar groups, a portion of which is embedded and fixed in the railway concrete sleeper base layer 1 at the damaged site. The plane of the steel bar group is perpendicular to the ground and perpendicular to the extension direction of the sleeper.

[0032] The sleeper shoulder repair layer 3 covers the aforementioned reinforcement and rebar reinforcement layer 2, and is tightly bonded to the damaged railway concrete sleeper base layer 1 to restore the original sleeper shoulder profile.

[0033] The sleeper surface protective layer 4 is disposed on the aforementioned sleeper shoulder repair layer 3.

[0034] Specifically, the reinforcing rebar layer 2 strengthens the concrete's constraint through one or more steel bars embedded and fixed to the damaged area of ​​the railway concrete sleeper base 1, thereby improving the bearing capacity of the shoulder. The sleeper shoulder repair layer 3 is tightly bonded to the railway concrete sleeper base 1 and restores the original sleeper shoulder profile. Under the synergistic effect of the reinforcing rebar layer 2, it re-forms itself into a whole with the railway concrete sleeper base 1, better supporting and fixing the track. The sleeper surface protective layer 4 is applied to the sleeper shoulder repair layer 3. The sleeper surface protective layer 4 is made of a material with both good flexibility and durability, which can effectively prevent the natural environment from eroding the sleeper, prevent external rainwater and harmful gases from penetrating into the structure, improve the sleeper's durability, and extend its service life.

[0035] This utility model's technical solution can achieve multiple overall protection against damage to the concrete sleeper shoulders of existing railway lines, better utilize their function of supporting and fixing the track, and effectively prevent the occurrence of damage, resulting in excellent repair effects.

[0036] In some specific embodiments of this utility model, the reinforcing rebar reinforcement layer 2 is embedded to a depth of 90-110mm in the aforementioned railway concrete sleeper base layer 1; and / or, the distance between the aforementioned rebar groups is 40-60mm; and / or, the diameter of the rebars in the aforementioned rebar groups is 6-8mm.

[0037] In some specific embodiments of this utility model, the steel bar group is a group of steel bars perpendicular to the ground, and its top end can be a downward hook shape.

[0038] In some specific embodiments of this utility model, the reinforcing bar assembly consists of vertical reinforcing bars perpendicular to the ground plane and horizontal reinforcing bars perpendicular to the aforementioned vertical reinforcing bars; the aforementioned vertical reinforcing bars and the aforementioned horizontal reinforcing bars are fixedly connected. The combined action of the vertical and horizontal reinforcing bars better fixes the sleeper shoulder repair layer 3 to the railway concrete sleeper base layer 1, forming a new whole, and makes the repaired sleeper shoulder stronger and more durable. The fixed connection between the vertical and horizontal reinforcing bars can be achieved by welding or by binding.

[0039] In some specific embodiments of this utility model, one or both ends of the transverse reinforcing bars are bent towards the ground. Bending one or both ends of the transverse reinforcing bars towards the ground to form a hook shape better secures the sleeper shoulder repair layer 3 to the railway concrete sleeper base layer 1, forming a new integrated structure.

[0040] In some specific embodiments of this utility model, in one of the aforementioned steel bar groups, the spacing of the aforementioned vertical steel bars is 40-60mm.

[0041] In some specific embodiments of this utility model, the specific construction steps of the reinforcing rebar reinforcement layer 2 are as follows:

[0042] The first step is to fabricate or purchase steel reinforcement assemblies. For example... Figure 2 As shown, in a rebar group, there are two vertical rebars and one horizontal rebar. The horizontal rebar is welded to the top of the two vertical rebars, and one end of the horizontal rebar is bent towards the ground to form a hook. The diameter of the rebars in the rebar group is 6-8 mm.

[0043] The second step is to temporarily support the rails on both sides of the sleeper to be repaired with hardwood and rubber pads; remove the fasteners, rubber pads and other accessories of the sleeper to be repaired, and use tools such as pneumatic picks and hammers to chisel away the loose concrete and aggregate at the damaged shoulder to form a new rough surface. Use a high-pressure air gun and a wire brush to clean the dust and debris at the shoulder.

[0044] The third step is to use an impact drill to drill the cleaned concrete sleeper base layer 1 of the railway sleeper according to... Figure 3 Drill holes for rebar installation. Preferably, the drilling depth is 90–110 mm; the spacing between the holes is 40–60 mm, and the hole diameter is 6–8 mm, matching the diameter of the rebar.

[0045] Fourth step: Use an air pump to remove dust from the rebar holes, inject anchoring agent into the rail spikes, and follow the instructions. Figure 2 After the reinforcement bars are laid out and the anchoring agent for the road spikes has cured, the construction of the reinforcement layer 2 is completed.

[0046] In some specific embodiments of this utility model, the setting time of the road spike anchoring agent is ≤20 min, more preferably 10-15 min. Within the above preferred range, the reinforcing rebar reinforcement layer 2 has a shorter construction time and better rebar reinforcement effect. In actual implementation, the road spike anchoring agent can be a commercially available product from Jilin Zhongxin Building Materials Co., Ltd.

[0047] In some specific embodiments of this utility model, the sleeper shoulder repair layer 3 is formed of a special sleeper repair material. This special sleeper repair material can be applied using a self-leveling pouring process, allowing it to bond tightly to the railway concrete sleeper base layer 1. Furthermore, under the synergistic effect of the reinforcing bar reinforcement layer 2, it re-forms itself into a unified whole with the railway concrete sleeper base layer 1, better fulfilling its function of supporting and fixing the track. The specific construction steps for the sleeper shoulder repair layer 3 are as follows:

[0048] The first step is to sprinkle water on the cleaned railway concrete sleeper base layer 1, so that the surface is saturated with water but does not drip.

[0049] The second step is to install the template according to the existing dimensions of the sleeper shoulder, and use tape sealing strips to seal the gap between the template and the railway concrete sleeper base layer.

[0050] The third step is to mix water and sleeper repair material at a weight ratio of 0.12 to 0.16 for 2 to 4 minutes at a speed of 120 to 160 r / min until well mixed.

[0051] The fourth step is to pour the mixed repair material into the template. After the material hardens, the template is removed, and the repair material is ground smooth to restore its original shape and dimensions to match the sleeper shoulder structure, thus obtaining the sleeper shoulder repair layer 3. In some specific embodiments of this utility model, the sleeper-specific repair material preferably has an initial flowability of ≥340mm, an initial setting time of ≤10min, a final setting time of ≤30min, a 1h compressive strength of ≥35MPa, a 1d compressive strength of ≥55MPa, and a 7d bond strength of ≥0.8MPa; more preferably, the initial flowability of the truncated cone is 340~345mm, the initial setting time is 8~10min, the final setting time is 22~27min, the 1h compressive strength is 35~40MPa, the 1d compressive strength is 60~65MPa, and the 7d bond strength is 0.9~1.0MPa; the sleeper-specific repair material within the above preferred value range can quickly and tightly bond with the railway concrete sleeper base layer 1 to form a whole, thus fulfilling the function of the sleeper shoulder. In practice, the sleeper-specific repair material can be a product of Beijing Juancheng Railway Engineering Technology Co., Ltd., which is available in the market.

[0052] In some specific embodiments of this utility model, the material of the sleeper surface protective layer 4 is a flexible concrete protective coating; preferably, it does not blister, peel, or crack after 400 hours of artificial weathering aging test, and shows no abnormalities in temperature resistance deformation test after 5 cycles, with an elongation at break ≥170% under standard conditions. The test methods refer to GB 14522-1993 "Artificial Weathering Accelerated Test Method for Plastics, Coatings and Rubber Materials for Mechanical Industry Products", JG / T 25-2017 "Test Method for Temperature Resistance Deformation of Building Coatings", and GB / T 23445 "Polymer Cement Waterproof Coatings", etc. Further preferably, the elongation at break under standard conditions is 190-210%. Flexible concrete protective coatings within the above preferred value range exhibit better elastic recovery. In actual implementation, the flexible concrete protective coating can be a commercially available product from Beijing Juancheng Railway Engineering Technology Co., Ltd.

[0053] In some specific embodiments of this utility model, the sleeper surface protective layer 4 is constructed approximately 1 hour after the sleeper shoulder repair layer 3 is completed. The specific construction steps are as follows:

[0054] The first step is to apply flexible concrete protective coating to the sleeper shoulder repair layer 3.

[0055] The second step is to remove the temporary support devices for the rails on both sides and install and restore the fastening system.

[0056] In some specific embodiments of this invention, the thickness of the sleeper surface protective layer 4 is 80–120 μm. Within this thickness range, the flexible concrete protective coating and the repair layer work closely together to better achieve the surface protection effect.

[0057] The present invention will be further described below with reference to specific embodiments, but this should not be construed as a limitation on the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention still fall within the scope of protection of the present invention.

[0058] Unless otherwise specified, all materials and reagents mentioned below are commercially available products well known to those skilled in the art; unless otherwise specified, all methods described are methods known in the art. Unless otherwise defined, the technical or scientific terms used should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0059] Example

[0060] To verify the effectiveness, adaptability, and reliability of the repair structure for damaged concrete sleeper shoulders of existing railway lines, this application selected to conduct tests on damaged concrete sleeper shoulders of a certain railway line.

[0061] The repair structure for damaged shoulders of concrete sleepers in existing railway lines in this embodiment includes a reinforcing bar reinforcement layer 2, a sleeper shoulder repair layer 3, and a sleeper surface protective layer 4, which are sequentially installed on the existing railway concrete sleeper base layer 1.

[0062] The materials used are as follows:

[0063] 1. The reinforcement layer 2 uses steel bar groups and track spike anchoring agent; the shape of the steel bar groups is as follows: Figure 2 As shown, in a rebar group, there are two vertical rebars and one horizontal rebar. The horizontal rebar is welded to the top of the two vertical rebars, and one end of the horizontal rebar is bent towards the ground to form a hook. The rebars in the rebar group are products purchased from Shandong Xintuoyuan Special Steel Co., Ltd., and the road stud anchoring agent is a product purchased from Jilin Zhongxin Building Materials Co., Ltd., with the following performance indicators: rebar type is HRB400, diameter is 6mm; the setting time of the road stud anchoring agent is 13min.

[0064] 2. The sleeper shoulder repair layer 3 uses sleeper-specific repair material, which is a commercially available product manufactured by Beijing Juancheng Railway Engineering Technology Co., Ltd. Its performance indicators are as follows: initial flowability of the truncated cone is 345mm, initial setting time is 8min, final setting time is 25min, 1h compressive strength is 37MPa, 1d compressive strength is 62MPa, and 7d bond strength is 0.9Mpa.

[0065] 3. The surface protective layer 4 of the sleeper adopts concrete protective coating, which is a product purchased from Beijing Juancheng Railway Engineering Technology Co., Ltd. Its performance indicators are as follows: after 400h artificial weathering aging test, it does not blister, peel off, or crack; after 5 cycles of temperature deformation test, the results are normal; the elongation at break under standard conditions is 180%.

[0066] The specific construction process is as follows:

[0067] 1. Temporarily support the rail on both sides of the sleeper to be repaired with hardwood and rubber pads; remove the fasteners, rubber pads and other accessories of the sleeper to be repaired, and use tools such as pneumatic picks and hammers to chisel away the loose concrete and aggregate at the damaged shoulder to form a new rough surface. Use a high-pressure air gun and wire brush to clean the dust and debris at the shoulder.

[0068] 2. After cleaning, the railway concrete sleeper base layer 1 is prepared using an impact drill according to... Figure 3 Drill anchor holes to a depth of 100mm, with a hole diameter of 6mm and a spacing of 50mm. Use an air pump to remove dust from the anchor holes, then inject anchoring agent into the road spikes. Figure 2 After the reinforcement bars are laid out and the adhesive has cured for 13 minutes, the construction of the reinforcement layer 2 is completed.

[0069] 3. Sprinkle water on the cleaned railway concrete sleeper base layer 1 until the surface is saturated but not dripping, then begin construction of the shoulder repair layer. Install a template according to the existing dimensions of the sleeper shoulder and pour the mixed repair material into the template. After the material hardens, remove the template and grind the repair material smooth to restore its original dimensions to match the sleeper shoulder structure. The steps are as follows: First, mix water and sleeper repair material at a weight ratio of 0.15, and stir thoroughly for 2.5 minutes until well mixed. The mixing speed is 130 r / min. Then, pour the mixture into the repair area, completing the pouring within 10 minutes.

[0070] 4. Approximately 1 hour after the completion of the sleeper shoulder repair layer 3 pouring, construction of the sleeper surface protective layer 4 begins. A 90μm thick concrete protective coating is applied to the sleeper shoulder repair layer 3. After coating, the temporary support devices for the rails on both sides are removed, and the fastening system is installed and restored.

[0071] 5. The construction of the repair structure was completed following the steps outlined above.

[0072] After the actual engineering application of this embodiment, engineering technicians regularly inspected the effect of the repaired test sleepers. During long-term operation, the sleepers repaired using this embodiment remained structurally intact, and no cracking, peeling, or flaking occurred on the surface, achieving the expected results.

[0073] The above engineering practices have shown that, for the repair of damaged concrete sleeper shoulders on existing railway lines, the repair structure for damaged concrete sleeper shoulders on existing railway lines described in this utility model can effectively repair the damaged concrete sleeper shoulders on existing railway lines without affecting the normal operation of trains. It is an effective measure for repairing damaged concrete sleeper shoulders on existing railway lines.

[0074] The technical features in the claims and / or specification of this utility model can be combined, and the combination is not limited to the combinations obtained by reference in the claims. Technical solutions obtained by combining the technical features in the claims and / or specification are also within the scope of protection of this utility model.

[0075] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A repair structure for repairing damage of a concrete tie shoulder of an existing railway line, characterized by, It comprises: a reinforcing bar reinforcement layer comprising one or more steel bar groups, a part of the steel bar group being embedded and fixed in the railway concrete sleeper base layer at the damaged part, the plane where the steel bar group is located being perpendicular to the ground and perpendicular to the extension direction of the sleeper; a sleeper shoulder repair layer covering the reinforcing bar reinforcement layer, being closely bonded with the railway concrete sleeper base layer at the damaged part and restoring the original sleeper shoulder profile; a sleeper surface protection layer arranged on the sleeper shoulder repair layer.

2. The repairing structure of the damaged part of the concrete sleeper shoulder of the existing railway line according to claim 1, wherein the depth of the reinforcing bar reinforcement layer embedded in the railway concrete sleeper base layer is 90-110 mm; and / or the distance between the steel bar groups is 40-60 mm; and / or the diameter of the steel bar in the steel bar group is 6-8 mm. The steel bar group is composed of vertical steel bars perpendicular to the ground and horizontal steel bars perpendicular to the vertical steel bars; the vertical steel bars are fixedly connected with the horizontal steel bars. One end or both ends of the horizontal steel bar are bent towards the ground. In one steel bar group, the number of vertical steel bars is 2, and the number of horizontal steel bars is 1; the horizontal steel bar is fixedly connected with the top ends of the two vertical steel bars.

3. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 1, characterized in that, In one steel bar group, the spacing of the vertical steel bars is 40-60 mm.

4. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 3, characterized in that, The steel bar group is fixed in the railway concrete sleeper base layer by using a spike anchoring agent.

5. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 3, characterized in that, The material of the sleeper shoulder repair layer is a sleeper special repair material.

6. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 5, characterized in that, The material of the sleeper surface protection layer is a flexible concrete protective coating.

7. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 1, characterized in that, The thickness of the sleeper surface protection layer is 80-120 μm.

8. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 1, characterized in that, ​ 9. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 1, wherein ​ 10. The structure for repairing damage of a concrete tie shoulder of an existing railway line according to claim 8, characterized in that, ​

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