Concrete floor slab sliding layer

Abstract

The application discloses a concrete bottom plate sliding layer, which comprises a cushion layer, a first isolation layer, a sliding layer and a second isolation layer, the upper part of the cushion layer is sequentially laid with the first isolation layer, the sliding layer and the second isolation layer from bottom to top, the sliding layer comprises a center sliding layer and an edge sliding layer, the center sliding layer is arranged at the center cushion layer position, the edge sliding layer is arranged at the edge cushion layer position, the friction coefficient of the center sliding layer is greater than that of the edge sliding layer, the edge sliding layer comprises a PTFE film, an elastic rubber plate and graphite powder particles, a plurality of fine holes are formed in the elastic rubber plate, and the diameters of the fine holes are smaller than that of the graphite powder particles. The application has the advantages that the gradient design of the low-friction edge sliding layer and the high-friction center sliding layer prevents the edge cracking of the concrete bottom plate, realizes the change of the friction coefficient in the uneven settlement process of the concrete bottom plate, avoids the excessive slippage of the concrete bottom plate in the later large deformation process, and prevents the problem of insufficient overall anti-slippage capacity in the early stage.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and specifically to a sliding layer for a concrete base plate. Background Technology

[0002] During the construction of large-volume concrete slabs, shrinkage cracking and even through cracks often occur due to internal and external temperature differences and structural constraints. These issues must be controlled for safety reasons. Common technical measures include optimizing the concrete formula and setting up a sliding layer.

[0003] For example, utility model patent document CN220099963U discloses a sliding layer for wind turbine foundations suitable for rocky geological conditions, applicable to situations where the bearing layer of the wind turbine foundation is a rocky foundation in wind power engineering construction. Although this patent considers lateral restraint, in the environment of uneven settlement of soft soil foundations, the foundation settlement leads to huge tensile stress inside the base plate, resulting in the risk of cracking at the edges of the base plate. Summary of the Invention

[0004] The technical problem to be solved by this invention is how to prevent the concrete base slab from cracking at its edges under uneven settlement conditions.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A concrete base slab sliding layer includes a cushion layer, a first isolation layer, a sliding layer, and a second isolation layer, wherein the first isolation layer, the sliding layer, and the second isolation layer are laid sequentially from bottom to top on the upper part of the cushion layer; The cushioning layer consists of a central cushioning layer and edge cushioning layers. The edge cushioning layers are set around the central cushioning layer or on both sides along the length of the central cushioning layer. The sliding layer includes a central sliding layer and an edge sliding layer. The central sliding layer is located at the central pad layer position, and the edge sliding layer is located at the edge pad layer position. The friction coefficient of the central sliding layer is greater than that of the edge sliding layer. The edge sliding layer comprises a PTFE membrane, elastic rubber sheets, and graphite particles. The PTFE membrane is laid on top of the first insulating layer above the edge padding layer. Multiple sets of elastic rubber sheets are laid on the PTFE membrane, and graphite particles are laid on the elastic rubber sheets. The elastic rubber sheets have multiple fine pores, the diameter of which is smaller than the diameter of the graphite particles.

[0006] The sliding layer of the concrete base slab adopts a gradient design with low friction at the edge and high friction at the center. It utilizes the larger cross-sectional thickness and reinforcement in the central area to bear the stress and avoid overall slippage. At the same time, the edge sliding layer avoids stress concentration at the edge corners and prevents cracking at the edges of the concrete base slab.

[0007] In addition, by setting the edge sliding layer, the friction coefficient changes during the uneven settlement of the concrete base plate, avoiding excessive slippage when the concrete base plate undergoes large deformation in the later stage, while also preventing the problem of insufficient overall anti-slip capacity in the early stage.

[0008] Preferably, the subbase is C20 concrete.

[0009] Preferably, the first isolation layer is a 0.3mm asphalt film layer.

[0010] Preferably, the width of the edge padding layer is not less than 0.5m and not more than 3m.

[0011] Preferably, the central sliding layer is an asphalt mortar layer.

[0012] Preferably, the PTFE membrane thickness is 0.1-0.3 mm.

[0013] Preferably, the spacing between adjacent elastic rubber sheets is 0.5m.

[0014] Preferably, the pore diameter is 0.2-0.5 mm.

[0015] Preferably, the second isolation layer is a waterproof layer.

[0016] Preferably, the waterproof layer includes a waterproof coating layer and a waterproof membrane layer, which are arranged sequentially from bottom to top on the upper part of the sliding layer.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a gradient design of low friction edge sliding layer and high friction center sliding layer. It utilizes the larger cross-sectional thickness and reinforcement in the central area to bear the stress and avoid overall slippage. At the same time, the edge sliding layer avoids stress concentration at the edge corners and prevents cracking at the edges of the concrete base plate.

[0018] 2. By setting the edge sliding layer, the friction coefficient changes during the uneven settlement of the concrete base slab, avoiding excessive slippage when the concrete base slab undergoes large deformation in the later stage, while also preventing the problem of insufficient overall anti-slip capacity in the early stage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the padding layer in an embodiment of the present invention; Figure 3 This is a schematic diagram of the edge sliding layer in an embodiment of the present invention. Detailed Implementation

[0020] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited.

[0023] See Figure 1 This embodiment discloses a concrete base slab sliding layer, comprising a cushion layer 1, a first isolation layer 2, a sliding layer 3, and a second isolation layer 4. The first isolation layer 2, the sliding layer 3, and the second isolation layer 4 are laid sequentially from bottom to top on the upper part of the cushion layer 1.

[0024] See Figure 2 In this embodiment, the subbase 1 is made of C20 concrete, serving as the foundation and load-bearing platform of the entire system, providing a solid and flat base layer. The subbase 1 consists of a central subbase 11 and an edge subbase 12. The edge subbase 12 is arranged around the central subbase 11 or along both sides of the length of the central subbase 11. In this embodiment, it is arranged along both sides of the length of the central subbase 11. The width of the edge subbase is not less than 0.5m and not more than 3m.

[0025] The first isolation layer 2 is a 0.3mm asphalt film layer, which has both bonding and sealing functions, ensuring full penetration and sealing of the surface pores of the subbase.

[0026] The sliding layer 3 includes a central sliding layer 31 and an edge sliding layer 32. The central sliding layer 31 is located at the central cushion layer 11, and the edge sliding layer 32 is located at the edge cushion layer 12. The friction coefficient of the central sliding layer 31 is greater than that of the edge sliding layer 32. Specifically, in actual construction, under conditions of temperature changes, shrinkage, or foundation deformation, the concrete base slab 5 will generate stress. Traditional uniform sliding layers cannot distinguish the deformation coordination requirements of the edge and the center. Either the edge constraint is too large, leading to cracking and a high friction coefficient, or the overall anti-slip ability is insufficient, resulting in a low friction coefficient. In this embodiment, a gradient design of low friction of the edge sliding layer 32 and high friction of the central sliding layer 31 is adopted. The central sliding layer 31 provides greater constraint to the central area of ​​the concrete base slab to improve the anti-slip ability. The larger cross-sectional thickness and reinforcement of the central area are used to bear the stress and avoid overall slippage. At the same time, the edge sliding layer 32 is used to avoid stress concentration at the edge corners and prevent cracking at the edges of the concrete base slab 5.

[0027] Furthermore, the central sliding layer 31 is an asphalt mortar layer.

[0028] See Figure 3 The edge sliding layer 32 includes a PTFE membrane 321, an elastic rubber plate 322, and graphite powder 323. The PTFE membrane 321, with a thickness of 0.1-0.3 mm, is laid on the upper part of the first isolation layer 2 above the edge pad layer 12. Multiple sets of elastic rubber plates 322 are laid on the PTFE membrane 321, with a spacing of 0.5 m between adjacent elastic rubber plates 322. Graphite powder 323 is laid on the elastic rubber plates 322, and multiple fine holes 3221 are opened on the elastic rubber plates 322. The diameter of the fine holes 3221 is smaller than the diameter of the graphite powder 323. In this embodiment, the diameter of the fine holes 3221 is 0.2-0.5 mm. In order to prevent graphite powder particles 323 from falling into the fine holes 3221 under natural conditions, after the graphite powder particles 323 are spread above the elastic rubber plate 322, they are lightly pre-compacted using a light pressure roller, so that a continuous film or shell with a certain strength is formed on the surface of the graphite powder particles 323, preventing the graphite powder particles 323 from moving around on the elastic rubber plate 322. Specifically, in the early stage of uneven settlement of soft soil foundation, the elastic rubber plate 322 can maintain its complete thickness, and the graphite powder 323 is evenly distributed on its surface. At this time, the overall friction coefficient of the edge area of ​​the concrete base plate 5 is extremely low, allowing the edge of the concrete base plate 5 to slide freely and fully release tensile stress. When the settlement continues to increase, the compressive stress between the concrete base plate 5 and the edge cushion layer 12 causes the elastic rubber plate 322 to undergo compression deformation. Some of the graphite powder 323 is pressed into the fine pores 3221 of the elastic rubber plate 32, and the friction coefficient increases. This adaptive change in friction coefficient can avoid excessive slippage of the concrete base plate 5 when it undergoes large deformation in the later stage, while also preventing the problem of insufficient overall anti-slip capacity in the early stage.

[0029] The second isolation layer 4 is a waterproof layer, which includes a waterproof coating layer and a waterproof membrane layer. The waterproof coating layer and the waterproof membrane layer are arranged sequentially from bottom to top on the upper part of the sliding layer 32.

[0030] In summary, the concrete base slab sliding layer adopts a gradient design of low friction edge sliding layer 32 and high friction center sliding layer 31. The larger cross-sectional thickness and reinforcement in the central area are used to bear the stress and avoid overall slippage. At the same time, the edge sliding layer 32 is used to avoid stress concentration at the edge corners and prevent cracking at the edge of the concrete base slab 5.

[0031] In addition, by setting the edge sliding layer 32, the friction coefficient changes during the uneven settlement of the concrete base plate, avoiding excessive slippage of the concrete base plate 5 during the later large deformation, while also preventing the problem of insufficient overall anti-slip capacity in the early stage.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] The above embodiments are merely examples of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A sliding layer for a concrete base slab, characterized in that: It includes a cushion layer, a first isolation layer, a sliding layer, and a second isolation layer, with the first isolation layer, sliding layer, and second isolation layer laid sequentially from bottom to top on the upper part of the cushion layer; The cushioning layer consists of a central cushioning layer and edge cushioning layers. The edge cushioning layers are set around the central cushioning layer or on both sides along the length of the central cushioning layer. The sliding layer includes a central sliding layer and an edge sliding layer. The central sliding layer is located at the central pad layer position, and the edge sliding layer is located at the edge pad layer position. The friction coefficient of the central sliding layer is greater than that of the edge sliding layer. The edge sliding layer includes a PTFE membrane, an elastic rubber sheet, and graphite particles. The PTFE membrane is laid on the upper part of the first isolation layer above the edge pad layer. Multiple sets of elastic rubber sheets are laid on the PTFE membrane, and graphite particles are laid on the elastic rubber sheets. Multiple fine pores are opened on the elastic rubber sheets, and the diameter of the fine pores is smaller than the diameter of the graphite particles.

2. The concrete base slab sliding layer according to claim 1, characterized in that: The subbase is made of C20 concrete.

3. The concrete base slab sliding layer according to claim 1, characterized in that: The first isolation layer is a 0.3mm asphalt membrane.

4. The concrete base slab sliding layer according to claim 1, characterized in that: The width of the edge padding layer shall be no less than 0.5m and no more than 3m.

5. A concrete base slab sliding layer according to claim 1, characterized in that: The central sliding layer is an asphalt mortar layer.

6. A concrete base slab sliding layer according to claim 1, characterized in that: The thickness of the PTFE membrane is 0.1-0.3 mm.

7. A concrete base slab sliding layer according to claim 1, characterized in that: The spacing between adjacent elastic rubber sheets is 0.5m.

8. A concrete base slab sliding layer according to claim 1, characterized in that: The pore size is 0.2-0.5mm.

9. A concrete base slab sliding layer according to claim 1, characterized in that: The second isolation layer is a waterproof layer.

10. A concrete base slab sliding layer according to claim 9, characterized in that: The waterproof layer includes a waterproof coating layer and a waterproof membrane layer, which are arranged sequentially from bottom to top on the upper part of the sliding layer.

Images