End sealing device for full-section sealing layer on surface of ballastless track roadbed

Abstract

The utility model discloses a ballastless track subgrade surface full-section sealing layer end sealing device, and belongs to the technical field of railway subgrade waterproof facilities. The structure comprises a cast-in-place concrete sealing layer on the surface of a roadbed and concrete cable grooves formed in the two sides of a roadbed bed, the concrete cable grooves are prefabricated concrete cable grooves, and the upper ends of the side walls, close to the roadbed bed side, of the prefabricated concrete cable grooves are provided with grooves formed in the length direction of the prefabricated concrete cable grooves. The height of the side wall, located on the roadbed bed side, of the groove is larger than the height of the side wall, located on the cable trough side, of the groove, a convex structure is arranged at the bottom of the lap joint position of the cast-in-place concrete sealing layer and the prefabricated concrete cable trough, and the convex structure of the cast-in-place concrete sealing layer is inserted into the groove in the upper end of the prefabricated concrete cable trough. According to the utility model, rainwater and other ground water flows can be effectively prevented from entering the subgrade bed from the boundaries of the cable troughs on the two sides of the subgrade bed and gaps between the closed layers, frost boiling and other diseases of the subgrade bed are prevented, and the stability of the subgrade bed is ensured.

Description

Technical Field

[0001] This utility model relates to an end sealing device for the full-section sealing layer of the ballastless track subgrade surface, which is mainly used to prevent rainwater and other ground water from entering the subgrade through the gaps between the cable troughs on both sides of the subgrade and the sealing layer. It belongs to the technical field of railway subgrade waterproofing facilities. Background Technology

[0002] Railways, especially high-speed railways, occupy an important position in the comprehensive transportation system as a green, convenient, safe, and efficient mode of transportation. Trains experience strong dynamic loads, and the climate along the operating sections is complex. To prevent frost heave and mudslides in the roadbed, a layer of concrete is often poured on the surface of the roadbed to form a full-section sealed layer. However, operational practice shows that gaps easily form at the ends of the sealed layer and at the junction of cable trenches, such as... Figure 1 As shown, rainwater and other surface water can easily enter the subgrade through the gaps between the cable trenches on both sides and the sealing layer, causing excessive water content in the subgrade and leading to problems such as frost heave and mudslides. In severe cases, this can cause the subgrade to lose stability, affecting the operational safety of the railway line. Moreover, excessive water content in the subgrade makes subsequent maintenance and repair more difficult. Utility Model Content

[0003] To address the aforementioned deficiencies in the existing technology, this utility model provides a simple structural end-sealing device for the full-section sealing layer of the ballastless track subgrade surface, which effectively prevents rainwater and other surface water from entering the subgrade through the gaps between the cable troughs on both sides of the subgrade and the sealing layer.

[0004] This utility model is achieved through the following technical solution: a full-section sealing layer end sealing device for ballastless track subgrade surface, comprising a cast-in-place concrete sealing layer on the subgrade surface and concrete cable troughs set on both sides of the subgrade bed, characterized in that: the concrete cable troughs are precast concrete cable troughs, the upper end of the side wall of the precast concrete cable trough near the subgrade bed has a groove arranged along its length direction, the height of the side wall of the groove on the subgrade bed side is greater than the height of the side wall on the cable trough side, the bottom of the overlap between the cast-in-place concrete sealing layer and the precast concrete cable trough is provided with a convex structure, and the convex structure of the cast-in-place concrete sealing layer is inserted into the groove at the upper end of the precast concrete cable trough.

[0005] In this invention, the convex structure of the cast-in-place concrete sealing layer is inserted into the groove at the upper end of the precast concrete cable trough to form a concave-convex fit structure. Since the two sides of the groove on the precast concrete cable trough are at different heights, the side closer to the subgrade bed is higher and the side closer to the cable trough is lower. When water from the road surface seeps into the groove through the gap, according to the principle of communicating vessels, when the water level in the groove exceeds the lower sidewall, the water level will no longer rise and the water will flow out from the lower side, which can effectively prevent water from entering the subgrade side.

[0006] Furthermore, the inner wall of the precast concrete cable trough is coated with an elastic, expanding waterproof material layer. When water seeps into the trough, the elastic, expanding waterproof material expands, thereby blocking the water flow and preventing water from potentially entering the roadbed through capillary action.

[0007] Furthermore, to effectively prevent water seepage into the roadbed side, the height difference between the two side walls of the groove is greater than the local rainfall in millimeters.

[0008] The beneficial effects of this utility model are as follows: This utility model has a simple structure. By setting grooves of varying heights on the upper end of the sidewall of the precast concrete cable trough near the subgrade bed, and by setting a convex structure at the end of the cast-in-place concrete sealing layer to cooperate with the grooves of the precast concrete cable trough, a concave-convex fit structure is formed. This concave-convex fit structure itself has a certain water-blocking effect. When water seeping into the groove from the joint exceeds a certain level, the water in the groove can flow into the cable trough using the principle of communicating vessels, preventing water seepage into the subgrade side. By applying an elastic expansion waterproof material layer inside the groove of the precast concrete cable trough, the expansion of the elastic expansion waterproof material can block water flow and also prevent water from potentially entering the subgrade bed through capillary action. This utility model can effectively prevent rainwater and other surface water from entering the subgrade bed through the gaps between the concave interface of the cable trough on both sides of the subgrade bed and the sealing layer, thereby preventing subgrade bed defects such as frost heave caused by increased moisture content, ensuring the stability of the subgrade bed, and thus ensuring the normal operation of the railway. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of water flow at the junction of the end of the sealing layer and the cable trench in the existing technology;

[0010] Figure 2 This is a schematic diagram of the structure of this utility model;

[0011] Figure 3 This is a schematic diagram of the water flow at the junction of the end of the sealing layer and the precast concrete cable trough in this utility model;

[0012] Figure 4 This is a dimensional schematic diagram of the concave-convex mating structure in this utility model;

[0013] In the diagram, 1 is the roadbed, 2 is the cast-in-place concrete sealing layer, 2.1 is the convex structure, 3 is the precast concrete cable trough, 3.1 is the groove, 3.2 is the cable trough, 4 is the precast concrete cover plate, 5 is the graded crushed stone, and 6 is the elastic expansion waterproof material layer. Detailed Implementation

[0014] The present invention will be further described below through non-limiting embodiments and in conjunction with the accompanying drawings:

[0015] As attached Figures 2-3 As shown, a full-section sealing layer end sealing device for ballastless track subgrade surface includes a cast-in-place concrete sealing layer 2 on the subgrade surface and concrete cable troughs set on both sides of the subgrade bed 1. The concrete cable troughs are precast concrete cable troughs 3. The upper end of the side wall of the precast concrete cable trough 3 near the subgrade bed 1 has a groove 3.1 arranged along its length. The two side walls of the groove 3.1 are designed with unequal heights, with the height of the side wall of the groove 3.1 on the subgrade bed 1 side being greater than the height of the side wall on the cable trough 3.2 side. A protruding convex structure 2.1 is provided at the bottom of the overlap between the cast-in-place concrete sealing layer 2 and the precast concrete cable trough 3. This convex structure 2.1 is adapted to the groove 3.1 on the precast concrete cable trough 3. The convex structure 2.1 of the cast-in-place concrete sealing layer 2 is inserted into the groove 3.1 at the upper end of the precast concrete cable trough 3, forming a concave-convex fit structure. To further enhance waterproofing, it is preferable to coat the inner wall of the groove 3.1 of the precast concrete cable trough 3 with an elastic expansion waterproofing material layer 6. The elastic expansion waterproofing material is a prior art material, such as a water-swellable sealant or other existing elastic expansion waterproofing materials.

[0016] In this utility model, the dimensions of the convex structure 2.1 of the cast-in-place concrete sealing layer 2 and the groove 3.1 of the precast concrete cable trough 3 should meet the local thermal expansion and contraction structural stress requirements, and the concave and convex dimensions should be reasonably determined according to the climate zone, day and night temperature difference, etc. of the construction project location.

[0017] The precast concrete cable trough 3 in this utility model is prefabricated in the factory. To achieve better waterproofing, an elastic expansion waterproof material coating is applied to the groove 3.1, providing more effective waterproofing. (See attached...) Figure 4 As shown, the dimensions of the groove 3.1 of the precast concrete cable trough 3 should be designed accordingly. The dimensions of the higher sidewall a should meet the requirement that its shear strength is greater than the tensile stress generated by the concrete structure at the local temperature to prevent the concrete structure from being pulled apart. The length of a+b+c in the groove should not be too long. While ensuring that the structure and function meet the corresponding requirements, its economic rationality should also be guaranteed. At the same time, the height difference h between the two unequal sidewalls of the groove should meet the rainfall requirements of the construction project location. h should be greater than the local rainfall in millimeters.

[0018] During the construction of this utility model, the construction sequence should be: first, the precast concrete cable trough should be constructed, followed by the sealing layer. When constructing the cast-in-place concrete sealing layer, the construction should be carried out according to the specific conditions of the precast concrete cable trough 3. The dimensions of the concave and convex structures should be fully considered in light of local climate and geological conditions and determined through calculation to prevent situations such as inability to properly embed or cracking due to thermal expansion.

[0019] This invention utilizes a convex-concave mating structure formed by the convex structure 2 at the end of the cast-in-place concrete sealing layer 2 and the groove 3.1 of the precast concrete cable trough 3. This mating structure effectively impedes water seeping into the gap between the cast-in-place concrete sealing layer 2 and the precast concrete cover plate 4, preventing the seeping water from entering the subgrade bed. Based on the principle of communicating vessels, when the water level in the groove 3.1 exceeds the lower sidewall of the groove 3.1, the water will flow into the cable trough 3.2, effectively preventing water seepage into the subgrade bed. The elastic, expanding waterproof material layer coated inside the groove 3.1 expands when water flows into it, blocking the water flow and also preventing water from potentially entering the subgrade bed through capillary action. This utility model, through the concave-convex fit structure formed between the cast-in-place concrete sealing layer 2 and the precast concrete cable trough 3, and the elastic expansion waterproof material coating applied to the groove 3.1, provides double protection against water seeping into the gaps from entering the subgrade bed. This prevents diseases such as frost heave caused by increased moisture content in the subgrade bed, ensuring the stability of the subgrade bed and guaranteeing the normal operation of the railway.

[0020] The other parts in this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A full-section sealing layer end sealing device for ballastless track subgrade surface, comprising a cast-in-place concrete sealing layer on the subgrade surface and concrete cable troughs disposed on both sides of the subgrade bed, characterized in that: The concrete cable trough is a precast concrete cable trough. The upper end of the side wall of the precast concrete cable trough near the subgrade has a groove arranged along its length. The height of the side wall of the groove on the subgrade side is greater than the height of the side wall on the cable trough side. The bottom of the overlap between the cast-in-place concrete sealing layer and the precast concrete cable trough has a convex structure. The convex structure of the cast-in-place concrete sealing layer is inserted into the groove at the upper end of the precast concrete cable trough.

2. The ballastless track bed surface full-section closed layer end closing device according to claim 1, characterized in that: The inner wall of the precast concrete cable trough is coated with an elastic, expanding, waterproof material layer.

3. The device for closing the end of the full-section closing layer of the ballastless track bed surface according to claim 1 or 2, characterized in that: The height difference between the two side walls of the groove is greater than the local rainfall in millimeters.

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