Method for improving interface connection performance between filling layer and track plate

Abstract

This invention discloses a method for improving the interfacial bonding performance between the filler layer and the track slab, comprising: preparing a release cloth of the same size as the bottom plate of the track slab and capable of permeating and absorbing cement slurry on both sides; after vibrating and leveling the track slab concrete, laying the release cloth flat on the bottom of the track slab, allowing the slurry-rich layer on the surface of the track slab concrete to permeate into the release cloth, forming a dense cement slurry layer with strong adhesion; laying, fine-tuning, and sealing the bottom of the track slab with the release cloth bonded to it, and then pouring self-compacting concrete. During the pouring of the self-compacting concrete, the internal floating slurry permeates to the release cloth bonded to the bottom surface of the track slab, some of the water in the slurry is absorbed and evaporated by the release cloth, and the floating air bubbles are absorbed and broken at the release cloth, thereby increasing the density of the upper surface of the self-compacting concrete and forming a strongly bonded air bubble and water seepage slurry absorption layer with the release cloth. This invention can effectively improve the interfacial bonding performance between the filler layer and the track slab, and extend the service life of the track structure.

Description

Technical Field

[0001] This invention relates to the field of high-speed railway construction technology, and specifically to a method for improving the interface connection performance between the filler layer and the track slab. Background Technology

[0002] The CRTSⅢ type slab track structure consists of a concrete base slab, geotextile, self-compacting concrete infill layer, precast track slabs, fasteners, and rails from bottom to top. The self-compacting concrete infill layer is the key structural layer, responsible for adjustment, support, and force transmission; its quality directly affects the performance of the entire track structure. The self-compacting concrete infill layer is constructed after the base slab is completed, the upper precast track slab is placed and leveled, and the formwork on both sides is in place. Clearly, pouring concrete into a closed space enclosed on all six sides (front, back, left, right, top, and bottom) is extremely difficult. Furthermore, the presence of reinforcing mesh and other obstructions within the closed space, coupled with the prohibition of external vibration during construction, necessitates the concrete to fill the entire closed space solely by its own weight. This requires the freshly mixed self-compacting concrete to possess excellent workability and stricter quality control during pouring.

[0003] However, since concrete is a heterogeneous three-phase mixture of gas, liquid, and solid, mainly composed of cement, sand, gravel, and water, before freshly mixed concrete sets and hardens, substances with lower density, such as air bubbles, cement, and water, float to the surface, while substances with higher density, such as sand and gravel, sink. This results in a high water-cement ratio on the surface of self-compacting concrete, leading to relatively poor compaction. During the production of track slabs, due to the formwork construction method, the bottom surface of the track slab is the concrete forming surface. Therefore, there are also problems such as settlement, segregation, and bleeding due to density differences, resulting in poor compaction of the bottom of the slab. The compaction of the concrete at the interface between the self-compacting concrete filling layer and the track slab is worse than that of the main body, which will affect the interface bonding performance between the self-compacting concrete filling layer and the track slab. As operating time increases, and due to the influence of dynamic loads and temperature on the track structure, gaps develop between the self-compacting concrete infill layer and the track slab. These gaps lead to rigid impacts between the track slab and the self-compacting concrete infill layer, causing cracks to appear from the interface inwards. Especially after rainwater enters, under dynamic loads, the water erodes the interface, further affecting the durability of the track structure. Therefore, improving the interface bonding performance between the infill layer and the track slab is of great significance for improving the durability and service performance of the track structure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for improving the interface connection performance between the filling layer and the track slab.

[0005] This invention discloses a method for improving the interface connection performance between the filler layer and the track slab, comprising:

[0006] Step S1: Prepare a release cloth that is the same size as the bottom plate of the track slab and can be permeable and absorb cement slurry on both sides;

[0007] Step S2: After vibrating and leveling the track slab concrete, the isolation cloth is laid flat on the bottom of the track slab, so that the slurry layer on the surface of the track slab concrete penetrates into the isolation cloth. Some of the water in the slurry layer is absorbed and evaporated by the isolation cloth, which increases the density of the concrete and forms a dense cement slurry layer with strong adhesion to the isolation cloth.

[0008] Step S3: Lay the track slab with the isolation cloth glued to the bottom along the track direction, and fine-tune and seal the edges of the laid track slab;

[0009] Step S4: Pour self-compacting concrete between the track slab and the base to form a filling layer. During the pouring and flow of the self-compacting concrete, the internal floating slurry penetrates into the isolation cloth that has been bonded to the bottom surface of the track slab. Some of the water in the slurry is absorbed and evaporated by the isolation cloth, and the floating air bubbles are absorbed and broken at the isolation cloth, thereby increasing the density of the upper surface of the self-compacting concrete and forming a strongly bonded air bubble seepage slurry absorption layer with the isolation cloth.

[0010] As a further improvement of the present invention, the isolation cloth includes one of nonwoven fabric and woven fabric;

[0011] The length and width of the isolation cloth are the same as the length and width of the track slab base plate; the thickness of the isolation cloth is not less than 1mm.

[0012] As a further improvement of the present invention, the isolation cloth is one of nonwoven fabric or woven fabric, and the surface of the nonwoven fabric or the woven fabric has a certain degree of permeability.

[0013] As a further improvement of the present invention, the isolation cloth is a three-dimensional spaced continuous fabric.

[0014] The three-dimensional spacer continuous fabric is impregnated with functional materials.

[0015] As a further improvement of the present invention, the functional material includes a water-absorbing resin of 0-0.2 kg / m³. 2 Water-repellent agent 0-0.4 kg / m 2 Dispersible adhesive powder 0-0.1kg / m 2 Bentonite 0-0.1kg / m 2 Cementitious materials 0-1kg / m 2 One or more of them.

[0016] As a further improvement of the present invention, the filling layer may also be filled with cement asphalt mortar, resin mortar or polymer mortar.

[0017] As a further improvement of the present invention, each track slab is provided with a plurality of vertical through holes spaced apart along the direction perpendicular to the track. The vertical through holes are used as observation holes or grouting holes for self-compacting concrete.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention solves the problem that in high-flowability self-compacting concrete, substances with low density such as air bubbles, cement, and water tend to float during the pouring process, resulting in a high water-cement ratio and poor compaction on the surface of the self-compacting concrete, thereby improving the surface compaction of the self-compacting concrete.

[0020] This invention solves the problem of relatively high water-cement ratio and poor compactness of the forming surface of track slabs during the mold-making process, and improves the compactness of the bottom of the track slab.

[0021] This invention addresses the rigid interface connection between the self-compacting concrete filling layer and the track slab, eliminates the weak interface between the new and old concrete, and introduces a buffer layer to improve the stress and force transmission mechanism between the self-compacting concrete filling layer and the track slab while meeting the requirements of track stress.

[0022] This invention improves the interfacial bonding performance between the filling layer and the track slab, reduces the risk of cracking between the self-compacting concrete filling layer and the track slab, solves the problem of grout leakage caused by external water intrusion and interface erosion, and extends the service life of the track structure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of laying a release cloth after vibrating and leveling the track slab concrete, which is a method for improving the interface connection performance between the filling layer and the track slab according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of a method for improving the interface connection performance between the filling layer and the track slab according to an embodiment of the present invention, in which a slurry-rich layer on the concrete surface penetrates into the isolation cloth to form a strongly adhesive and dense cement slurry layer.

[0025] Figure 3 This is a schematic diagram of the flow of self-compacting concrete poured under a track slab bonded with geotextile, illustrating a method for improving the interface connection performance between the filling layer and the track slab according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of a semi-rigid composite material formed by impregnating the isolation cloth with cement slurry, which is a method for improving the interface connection performance between the filling layer and the track slab according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of a three-dimensional spaced continuous fabric structure with double-sided permeable adsorption of cement slurry, which is a method for improving the interface connection performance between the filling layer and the track slab disclosed in an embodiment of the present invention.

[0028] In the picture:

[0029] This invention:

[0030] 1. Track slab; 2. Portal-shaped connecting steel bars; 3. Isolation cloth; 4. Base; 5. Self-compacting concrete; 6. Semi-rigid composite material bridging layer; 6-1. Dense cement slurry layer; 6-2. Air bubble seepage slurry dissipation layer. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] This invention provides a method for improving the interface connection performance between the filler layer and the track slab, characterized by comprising:

[0036] Step S1: Prepare a release cloth 3 that is the same size as the bottom plate of track slab 1 and can be permeable and absorb cement slurry on both sides;

[0037] Step S2: After vibrating and leveling the concrete of track slab 1, lay the isolation cloth 3 flat on the bottom of track slab 1. By vibrating appropriately again, the slurry layer on the surface of track slab 1 concrete penetrates into the isolation cloth 3. Some of the water in the slurry layer is absorbed and evaporated by the isolation cloth, which improves the density of the concrete and forms a dense cement slurry layer 6-1 with strong adhesion to the isolation cloth 3.

[0038] Step S3: Lay the track slab 1 with the isolation cloth 3 glued to the bottom along the track direction, and fine-tune and seal the edges of the laid track slab 1.

[0039] Step S4: Pour self-compacting concrete 5 between track slab 1 and base 4 to form a filling layer. During the pouring and flow of self-compacting concrete 5, the internal floating slurry will penetrate to the isolation cloth 3 on the bottom surface of the bonded track slab 1. Some of the water in the slurry will be absorbed and evaporated by the isolation cloth 3. The floating air bubbles will be absorbed and broken at the isolation cloth 3, which will improve the density of the upper surface of the self-compacting concrete 5 and form a strongly bonded air bubble seepage slurry absorption layer 6-2 with the isolation cloth 3, thereby forming a dense interface connection layer between the track slab and the filling layer.

[0040] Specifically:

[0041] Furthermore, in step S2, the track slab 1 is prefabricated in the prefabrication yard using a model, and the bottom of the track slab 1 is facing upwards during the prefabrication process. Inside the model, the side with the portal-shaped connecting steel bars 2 faces upwards. Therefore, the vibration of the concrete of the track slab 1 mentioned in step S2 is the vibration of the side of the track slab 1 with the portal-shaped connecting steel bars 2.

[0042] Furthermore, in step S2, due to the density difference, the water-cement ratio on the concrete surface of track slab 1 is slightly higher and it is easy to form a grout-rich area. Therefore, after laying the isolation cloth 3, there is no need for proper secondary vibration. That is, through the penetration and diffusion effect, the cement grout can form a good bond with the isolation cloth 3.

[0043] Furthermore, after the concrete of the track slab 1 has fully hardened, it can be bonded to the bottom of the track slab 1 by applying adhesive or pre-applying adhesive to the isolation cloth 3. In this case, the isolation cloth 3 does not need to be permeable to absorb cement slurry on both sides; only the side in contact with the self-compacting concrete 5 needs to be permeable to cement slurry. The side that is bonded to the bottom of the track slab 3 does not need to be permeable.

[0044] Furthermore, the isolation cloth 3 in this invention includes one of non-woven fabric and woven fabric; the length and width of the isolation cloth 3 are consistent with the length and width of the track plate bottom plate; the thickness of the isolation cloth 3 is not less than 1mm.

[0045] Furthermore, the isolation cloth 3 in this invention is either a nonwoven fabric or a woven fabric, and the surface of the nonwoven fabric or the woven fabric has a certain degree of permeability.

[0046] Furthermore, the isolation fabric 3 in this invention is a three-dimensional spacer continuous fabric; the three-dimensional spacer continuous fabric is impregnated with functional materials.

[0047] Furthermore, the functional material in this invention includes a water-absorbing resin of 0-0.2 kg / m³. 2 Water-repellent agent 0-0.4 kg / m 2 Dispersible adhesive powder 0-0.1kg / m 2 Bentonite 0-0.1kg / m 2 Cementitious materials 0-1kg / m 2 One or more of them.

[0048] Furthermore, the filling layer in this invention can also be filled with cement asphalt mortar, resin mortar, or polymer mortar.

[0049] Furthermore, each track slab 1 in this invention is provided with multiple vertical through holes spaced apart along the direction perpendicular to the track. The vertical through holes are used as observation holes or as grouting holes for self-compacting concrete 5.

[0050] Furthermore, the method disclosed in this invention can also be applied to improve the connection performance between the filler layer and the turnout plate.

[0051] Furthermore, in step S3, fine-tuning and sealing the edges of the laid track slab 1 is existing technology and will not be described in detail here.

[0052] Example 1:

[0053] To improve the interface bonding performance between the self-compacting concrete filling layer 5 and the track slab 1 of the CRTSⅢ slab track, a geotextile with a certain thickness that can permeate and absorb cement slurry on both sides is used as an interface buffer and isolation layer. The specific implementation method is as follows:

[0054] 1. Prepare a 4mm thick geotextile with the same bottom dimensions as the track slab 1, which can be permeable and absorbent of cement slurry on both sides, and reserve the position of the portal-shaped connecting steel bar 2 between the track slab 1 and the self-compacting concrete 5.

[0055] 2. After the concrete of track slab 1 is vibrated and leveled, the isolation geotextile is laid flat on the bottom of track slab 1, exposing the portal-shaped connecting steel bars 2. Figure 1 As shown.

[0056] 3. Vibrate again for several seconds using an attached vibrator. The slurry-rich layer on the concrete surface of track slab 1 will more easily penetrate and impregnate the geotextile. Some of the water in the slurry will also be absorbed by the geotextile. Since the geotextile is a porous material, the absorbed water evaporates easily, thus reducing the actual water-cement ratio of the concrete surface and increasing the concrete density. A strong, dense cement slurry layer 6-1 is formed between the concrete and the geotextile. Figure 2 As shown.

[0057] 4. After laying, fine-tuning, and sealing the edges of the track slab 1 with the geotextile bonded to the bottom as required, pour self-compacting concrete 5 under a certain pressure difference, such as... Figure 3 As shown.

[0058] 5. During the pouring and flow of self-compacting concrete 5, the slurry and air bubbles that rise from the inside to the surface will penetrate into the lower layer of the geotextile separating the track slab 1. Some of the water in the slurry is absorbed and evaporated by the geotextile 3, and the rising air bubbles are absorbed and broken through the geotextile, thereby reducing the actual water-cement ratio of the formed surface concrete, increasing the density of the upper surface of the self-compacting concrete 5, and forming a strongly bonded air bubble seepage slurry absorption layer 6-2 with the lower surface of the geotextile. Figure 4 As shown.

[0059] Furthermore, because the geotextile contains numerous fibers, these fibers intertwine and form a semi-rigid impregnated composite material 6 with high strength and rich in hardened paste, which is then permeated into the bottom surface of the track slab 1 and the surface of the self-compacting concrete 5 by the cement slurry. Figure 4 As shown, while reducing the actual water-cement ratio of the concrete at the contact surface between the track slab 1 and the filling layer and increasing the density of the interface between the two, the semi-rigid impregnated composite material 6 can also play a good bridging role, and its bonding effect is better than that of the direct bonding between the track slab 1 and the self-compacting concrete 5. It can also play an active and appropriate semi-rigid isolation role, which can not only effectively release the deformation stress of the track structure caused by dynamic loads and temperature, but also effectively buffer the rigid impact between the track slab 1 and the self-compacting concrete 5 layer, improve the force and force transmission mechanism between the self-compacting concrete 5 filling layer and the track slab 1, reduce the cracking risk between the filling layer and the track slab 1, solve the problem of grout leakage caused by external water intrusion and interface erosion, and extend the service life of the track structure.

[0060] Example 2

[0061] To improve the interfacial bonding performance between the self-compacting concrete fill layer 5 and the slab turnout, a three-dimensional interlocking fabric of a certain thickness with double-sided permeability and cement slurry adsorption capacity is used as an interfacial buffer and isolation layer. The specific implementation method is as follows:

[0062] 1. Prepare a 5mm thick, double-sided, three-dimensional, interlocking fabric with the same dimensions as the bottom surface of track slab 1. The fabric should be double-sided and permeable to absorb cement slurry. Both the top and bottom layers should have a mesh structure, with three-dimensional distribution of monofilament fibers in the middle. The fabric should be impregnated with 0-0.2kg / m² of absorbent resin. 2 Water-repellent agent 0-0.4 kg / m 2 Dispersible adhesive powder 0-0.1kg / m 2 Bentonite 0-0.1kg / m 2 Cementitious materials 0-1kg / m 2 One or more composite functional materials, such as Figure 5 As shown, the position of the gate-shaped connecting steel bar 2 between the track slab 1 and the self-compacting concrete 5 is reserved.

[0063] 2. After the concrete of track slab 1 is vibrated and leveled, the three-dimensional interlocking fabric is laid flat on the bottom of the track slab as an isolation cloth, exposing the portal-shaped connecting steel bars 2.

[0064] 3. Vibrate again for several seconds using an attached vibrator. The slurry-rich layer on the concrete surface of track slab 1 will more easily penetrate and impregnate the three-dimensional interlocking fabric. Some of the moisture in the slurry will also be absorbed by the three-dimensional interlocking fabric. Since the three-dimensional interlocking fabric is a porous material, the absorbed moisture evaporates easily, thereby reducing the actual water-cement ratio of the concrete on the forming surface, increasing the concrete density, and forming a strongly bonded, dense cement slurry layer 6-1 with one side of the three-dimensional interlocking fabric. Figure 2 As shown.

[0065] 4. After laying, fine-tuning and sealing the track slab with the three-dimensional interlocking fabric bonded to the bottom as required, pour self-compacting concrete under a certain pressure difference.

[0066] 5. During the pouring and flow of self-compacting concrete 5, the slurry and air bubbles that rise from the inside to the surface will penetrate into the lower layer of the three-dimensional interlocking fabric on the bottom surface of the bonded track slab 1. Some of the water in the slurry is absorbed and evaporated by the three-dimensional interlocking fabric. The rising air bubbles, oozing water, and laitance are absorbed and broken by the air bubble, oozing water, and laitance dissipation layer 6-2 at the three-dimensional interlocking fabric, thereby reducing the actual water-cement ratio of the formed surface concrete, increasing the density of the upper surface of the self-compacting concrete 5, and forming a strongly bonded and bridged semi-rigid composite material bridging layer 6 with the lower surface of the three-dimensional interlocking fabric, such as... Figure 4 As shown.

[0067] Furthermore, because the three-dimensional interlocking fabric contains numerous fibers, these fibers intertwine and form a semi-rigid impregnated composite material 6 with high strength and rich in hardened paste, which is then permeated into the bottom surface of the track slab 1 and the surface of the self-compacting concrete 5 by the cement grout. Figure 4As shown, while reducing the actual water-cement ratio of the concrete at the contact surface between the track slab 1 and the filling layer and increasing the density of the interface between the two, the semi-rigid impregnated composite material 6 can also play a good strong bridging role, and its bonding effect is better than the direct bonding between the track slab 1 and the self-compacting concrete 5. It can also play an active and appropriate semi-rigid isolation role, which can not only effectively release the deformation stress of the track structure caused by dynamic loads and temperature, but also effectively buffer the rigid impact between the track slab 1 and the self-compacting concrete 5 layer, improve the force and force transmission mechanism between the self-compacting concrete 5 filling layer and the track slab 1, reduce the cracking risk between the filling layer and the track slab 1, solve the problem of grout leakage caused by external water intrusion and interface erosion, and extend the service life of the track structure.

[0068] Furthermore, as the pre-added water-repellent agent in the three-dimensional interlocking fabric is gradually released, the waterproof performance of the concrete interface can be further improved, the interface connection performance between the filling layer and the track slab 1 can be enhanced, the risk of cracking between the filling layer and the track slab 1 can be reduced, and the negative impact of rainwater on the track structure can be mitigated, thus significantly extending the service life of the track structure.

[0069] Furthermore, the 2km track slab 1 line constructed using the present invention has shown good connection between the track slab 1 and the filling layer after 2 years of operation, with no gaps or grout leakage or flooding.

[0070] Advantages of this invention:

[0071] This invention solves the problem that in the pouring process of high-flowability self-compacting concrete 5, substances with low density such as air bubbles, cement, and water tend to float to the surface, resulting in a high water-cement ratio and poor compactness on the surface of the self-compacting concrete 5, and improves the compactness of the surface of the self-compacting concrete 5.

[0072] This invention solves the problem of relatively large water-cement ratio and poor compactness of the forming surface of track slab 1 during the production of track slab 1 by the mold-making method, and improves the compactness of the bottom of track slab 1.

[0073] This invention solves the rigid interface connection between the self-compacting concrete 5 filling layer and the track slab 1, eliminates the weak interface between the new and old concrete, and introduces a buffer layer to improve the stress and force transmission mechanism between the self-compacting concrete 5 filling layer and the track slab 1 while meeting the requirements of track stress.

[0074] This invention improves the interface connection performance between the filling layer and the track slab 1, reduces the risk of cracking between the self-compacting concrete 5 filling layer and the track slab 1, solves the problem of grout leakage caused by external water intrusion and interface erosion, and extends the service life of the track structure.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for improving the interface bonding performance between the filler layer and the track slab, characterized in that, include: Step S1: Prepare a release cloth that is the same size as the bottom plate of the track slab and can be permeable and absorb cement slurry on both sides; Step S2: After vibrating and leveling the track slab concrete, the isolation cloth is laid flat on the bottom of the track slab, so that the slurry layer on the surface of the track slab concrete penetrates into the isolation cloth. Some of the water in the slurry layer is absorbed and evaporated by the isolation cloth, which increases the density of the concrete and forms a dense cement slurry layer with strong adhesion to the isolation cloth. Step S3: Lay the track slab with the isolation cloth glued to the bottom along the track direction, and fine-tune and seal the edges of the laid track slab; Step S4: Pour self-compacting concrete between the track slab and the base to form a filling layer. During the pouring and flow of the self-compacting concrete, the internal floating slurry penetrates into the isolation cloth that has been bonded to the bottom surface of the track slab. Some of the water in the slurry is absorbed and evaporated by the isolation cloth, and the floating air bubbles are absorbed and broken at the isolation cloth, thereby increasing the density of the upper surface of the self-compacting concrete and forming a strongly bonded air bubble seepage slurry absorption layer with the isolation cloth.

2. The method for improving the interface connection performance between the filling layer and the track slab according to claim 1, characterized in that, The isolation fabric includes one of nonwoven fabric and woven fabric; The length and width of the isolation cloth are the same as the length and width of the track slab base plate; The thickness of the isolation cloth is not less than 1 mm.

3. The method for improving the interface connection performance between the filling layer and the track slab according to claim 1, characterized in that, The isolation fabric is either a nonwoven fabric or a woven fabric, and the surface of the nonwoven fabric or the woven fabric has a certain degree of permeability.

4. The method for improving the interface connection performance between the filling layer and the track slab according to claim 1, characterized in that, The isolation fabric is a three-dimensional spacer-in-one woven fabric; The three-dimensional spacer continuous fabric is impregnated with functional materials.

5. The method for improving the interface connection performance between the filling layer and the track slab according to claim 4, characterized in that, The functional material includes a water-absorbing resin of 0-0.2 kg / m³. 2 Water-repellent agent 0-0.4 kg / m 2 Dispersible adhesive powder 0-0.1kg / m 2 Bentonite 0-0.1kg / m 2 Cementitious materials 0-1kg / m 2 One or more of them.

6. The method for improving the interface connection performance between the filling layer and the track slab according to claim 1, characterized in that, Each track slab is provided with multiple vertical through holes spaced apart along the direction perpendicular to the track. These vertical through holes are used as observation holes or for grouting holes for self-compacting concrete.

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