Pre-paved EVA (Ethylene Vinyl Acetate) waterproof coiled material
By using a plastic grid, transparent EVA waterproof board and transparent oxygen barrier structure in the prepaved waterproof roll for tunnels, the construction difficulty caused by low transparency of the waterproof roll in the prior art is solved, and the waterproof effect with high transparency and strength is achieved.
Patent Information
- Application Number
- CN202421509742.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The existing prepaved waterproof coils for tunnels have extremely low transparency due to the existence of self-adhesive layer and isolation sand layer, which makes it difficult to construct, and it is prone to mis-welding problems, which leads to the fall of the waterproof layer.
The prepaved EVA waterproof coil structure consisting of plastic mesh, transparent EVA waterproof board and transparent oxygen barrier layer is welded together with the transparent EVA waterproof board away from the surface of the transparent oxygen barrier layer, replacing the self-adhesive layer and the isolation sand layer.
It improves the transparency of the waterproof coil, reduces the difficulty of construction, enhances the bonding strength between the waterproof coil and concrete, and improves the aging resistance of the product.
Smart Images
Figure CN222832517U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waterproof coiled materials, in particular to a pre-laid EVA waterproof coiled material. Background Art
[0002] In the existing technology, pre-laid waterproofing membranes for tunnels must meet the performance requirements of the standard GB / T 23457-2017. The current pre-laid waterproofing membrane structure for tunnels can be divided into three layers: main material, self-adhesive, and isolation sand layer. Among them, the role of the self-adhesive layer is to improve the bonding strength between the waterproofing membrane and the subsequent concrete poured; the role of the isolation sand is to prevent the self-adhesive from sticking to the feet of the construction workers during the construction process, causing inconvenience.
[0003] However, due to the presence of the self-adhesive layer and the isolation sand layer, the product transparency is extremely low, which leads to extremely low light transmittance of the pre-laid waterproof membrane. During the construction process of laying the waterproof membrane, it is impossible to observe the welding points on the other side of the waterproof membrane through the waterproof membrane, resulting in extremely difficult construction and prone to problems such as missed welding and wrong welding, which in turn causes the waterproof layer to fall off.
[0004] Therefore, providing a pre-laid EVA waterproofing membrane is a problem that needs to be solved by those skilled in the art. Utility Model Content
[0005] The utility model aims to provide a pre-laid EVA waterproofing membrane to solve the above problems.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A pre-laid EVA waterproof coiled material, characterized in that it comprises a plastic grid, a transparent EVA waterproof board and a transparent oxygen barrier layer which are arranged in sequence; the transparent oxygen barrier layer and the transparent EVA waterproof board are integrally formed, and the plastic grid and the surface of the transparent EVA waterproof board away from the transparent oxygen barrier layer are welded together.
[0008] Preferably, the plastic grid comprises a plurality of first plastic strips arranged in sequence and at intervals, a plurality of second plastic strips are arranged in sequence and at intervals above or below the first plastic strips, and the second plastic strips are staggered with the first plastic strips at a predetermined first angle.
[0009] Preferably, the cross-sectional area of the first plastic strip is a first cross-sectional area, the cross-sectional area of the second plastic strip is a second cross-sectional area, and the first cross-sectional area is smaller than the second cross-sectional area.
[0010] Preferably, it is characterized in that the distance L1 between each of the first plastic strips is equal, the distance L2 between each of the second plastic strips is equal, and L1 is equal to L2.
[0011] Preferably, a plurality of third plastic strips are sequentially arranged at intervals on one side of the second plastic strip away from the first plastic strip, the third plastic strips are staggered with the first plastic strip by a predetermined second angle, and a distance L3 between the third plastic strips is equal to L2.
[0012] Preferably, the cross-sectional areas of the 1st, 3rd, 5th, ... 2n-1st strips of the first plastic strip are the third cross-sectional areas, and the cross-sectional areas of the 1st, 3rd, 5th, ... 2n-1st strips of the second plastic strip are the fourth cross-sectional areas; the third cross-sectional area is larger than the first cross-sectional area; the fourth cross-sectional area is larger than the second cross-sectional area.
[0013] Preferably, the 1st, 3rd, 5th, ... 2n-1st strips of the first plastic strip further contain reinforcing fibers, and the 1st, 3rd, 5th, ... 2n-1st strips of the second plastic strip further contain reinforcing fibers.
[0014] Preferably, the first angle is 90 degrees and the second angle is 45 degrees.
[0015] Preferably, the thickness of the plastic grid is 0.2-4.0 mm; the thickness of the transparent EVA waterproof board is 0.9-4.0 mm; and the thickness of the transparent oxygen barrier layer (3) is 0.01-0.2 mm.
[0016] Compared with the prior art, the utility model has the following beneficial effects: by welding the plastic grid and the surface of the transparent EVA waterproof board away from the oxygen barrier layer, the self-adhesive layer and the isolation sand are replaced by the plastic grid; on the one hand, the cement mortar is in direct contact with the plastic grid layer, and after the cement mortar is cured, a mechanical bite is formed with the grid cloth layer, thereby ensuring the bonding strength between the waterproof membrane and the concrete; on the other hand, since the plastic grid and the transparent EVA waterproof board are both made of transparent materials, the waterproof membrane has high transparency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0018] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.
[0019] Figure 1 A schematic diagram of the structure of a pre-laid EVA waterproof membrane provided in this application
[0020] 1. Plastic grid; 2. Transparent EVA waterproof board; 3. Transparent oxygen barrier layer. DETAILED DESCRIPTION
[0021] In order to make the utility model's purpose, features, and advantages more obvious and easy to understand, the following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the embodiments described below are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.
[0023] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.
[0024] The embodiment of the utility model provides a pre-laid EVA waterproofing coiled material, characterized in that it comprises a plastic grid 1, a transparent EVA waterproofing board 2 and a transparent oxygen barrier layer 3 arranged in sequence; the transparent oxygen barrier layer 3 is integrally formed with the transparent EVA waterproofing board 2, and the plastic grid 1 is welded to the surface of the transparent EVA waterproofing board away from the transparent oxygen barrier layer. The welding method can be ultrasonic welding or infrared welding.
[0025] By using the plastic mesh 1 to replace the traditional isolation sand layer and the self-adhesive layer, during construction, the workers can see the back of the waterproof membrane through the holes in the mesh and the transparent EVA waterproof board 2, which is beneficial to the welding process.
[0026] At the same time, the plastic grid 1 is welded together with the transparent EVA waterproof board 2, eliminating the need for the self-adhesive layer and the isolation sand layer in the traditional pre-laid waterproof membrane, thereby avoiding the sticky phenomenon during the construction process;
[0027] Furthermore, after the concrete is poured, part of the concrete is embedded in the holes of the plastic grid 1, and after solidification, a "convex" structure inserted into each grid of the plastic grid 1 is formed, thereby ensuring the bonding strength between the waterproof membrane and the concrete.
[0028] After the product is constructed, due to the presence of the transparent oxygen barrier layer 3, it is not easy for bacteria and other microorganisms to grow inside the product, and the aging resistance can also be improved.
[0029] Preferably, the plastic grid 1 comprises a plurality of first plastic strips arranged in sequence and at intervals, a plurality of second plastic strips are arranged in sequence and at intervals above or below the first plastic strips, and the second plastic strips are staggered with the first plastic strips at a predetermined first angle.
[0030] Preferably, the cross-sectional area of the first plastic strip is the first cross-sectional area, the cross-sectional area of the second plastic strip is the second cross-sectional area, and the first cross-sectional area is smaller than the second cross-sectional area. That is, the cross-sectional area of one layer of fibers is slightly smaller than that of another layer of fibers; preferably, the arrangement direction of the second plastic strip is further arranged at 45 degrees to the stretching direction of the waterproof coiled material, which can effectively reduce the material of the plastic grid while ensuring the strength of the waterproof coiled material, thereby achieving the purpose of saving costs.
[0031] Preferably, the distances L1 between the first plastic strips are equal, the distances L2 between the second plastic strips are equal, and L1 is equal to L2.
[0032] Preferably, a plurality of third plastic strips are sequentially arranged on one side of the second plastic strip away from the first plastic strip, the third plastic strips are staggered with the first plastic strips at a predetermined second angle, and the distance L3 between the third plastic strips is equal to L2. In response to different strength requirements, a third plastic strip can be further added on the basis of the first plastic strip and the second plastic strip, so that the holes of the plastic mesh are triangular in shape, so that the mesh cloth has better structural strength.
[0033] Preferably, the cross-sectional area of the first, third, fifth, ... 2n-1th strip of the first plastic strip is the third cross-sectional area, and the cross-sectional area of the first, third, fifth, ... 2n-1th strip of the second plastic strip is the fourth cross-sectional area; the third cross-sectional area is greater than the first cross-sectional area; the fourth cross-sectional area is greater than the second cross-sectional area. By intermittently thickening the mesh cloth in an arithmetic progression, on the one hand, the overall strength of the product can be enhanced, and on the other hand, thickening and strengthening the entire mesh cloth can save materials.
[0034] Preferably, the first, third, fifth, ..., 2n-1th strip of the first plastic strip further comprises reinforcing fibers, and the first, third, fifth, ..., 2n-1th strip of the second plastic strip further comprises reinforcing fibers. Further preferably, by adding reinforcing fibers to the raw materials of the corresponding plastic strips and mixing them evenly, the reinforcing fibers can be evenly distributed in the plastic strips after extrusion, and by adding evenly distributed reinforcing fibers to the plastic strips, the strength of the plastic strips can be improved. Preferably, the reinforcing fibers can be glass fibers, basalt fibers, carbon fibers, etc.
[0035] Preferably, the third cross-sectional area is smaller than the second cross-sectional area; or, the third cross-sectional area is larger than the second cross-sectional area and smaller than the fourth cross-sectional area; or, the third cross-sectional area is larger than the fourth cross-sectional area.
[0036] Preferably, the first angle is 90 degrees and the second angle is 45 degrees.
[0037] Preferably, the thickness of the plastic grid 1 is 0.2-4.0 mm; the thickness of the transparent EVA waterproof board 2 is 0.9-4.0 mm; and the thickness of the transparent oxygen barrier layer 3 is 0.01-0.2 mm.
[0038] Composite production process:
[0039] In the first step, the transparent EVA waterproof sheet 1 and the EVOH oxygen barrier layer 2 are integrally formed through a co-extrusion die. Two single-screw extruders (A and B) extrude the EVA and oxygen barrier layer melts respectively, and converge in the co-extrusion die through different flow channels for extrusion. The upper surface layer is the oxygen barrier layer and the lower surface layer is the EVA waterproof sheet; marked as material 1;
[0040] In the second step, the plastic mesh 3 is obtained by extruding the molten material required for the mesh through a single screw extruder C, interweaving it into a mesh structure through a rotating mold, discharging it, and cooling it in a water tank to be shaped, which is marked as material 2;
[0041] In the third step, material 1 is separated from the oxygen barrier layer and is compounded with material 2 by infrared welding or ultrasonic welding, and the final product is obtained after cooling.
[0042] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A pre-laid EVA waterproofing membrane, characterized in that: It comprises a plastic grid (1), a transparent EVA waterproof board (2) and a transparent oxygen barrier layer (3) which are arranged in sequence; the transparent oxygen barrier layer (3) and the transparent EVA waterproof board (2) are integrally formed, and the plastic grid (1) and the surface of the transparent EVA waterproof board away from the transparent oxygen barrier layer are welded together.
2. The pre-laid EVA waterproofing membrane according to claim 1, characterized in that: The plastic grid (1) comprises a plurality of first plastic strips arranged in sequence and at intervals, a plurality of second plastic strips are arranged in sequence and at intervals above or below the first plastic strips, and the second plastic strips are staggered with the first plastic strips at a predetermined first angle.
3. The pre-laid EVA waterproofing membrane according to claim 2, characterized in that: The cross-sectional area of the first plastic strip is a first cross-sectional area, the cross-sectional area of the second plastic strip is a second cross-sectional area, and the first cross-sectional area is smaller than the second cross-sectional area.
4. The pre-laid EVA waterproofing membrane according to claim 3, characterized in that: The distances L1 between the first plastic strips are equal, the distances L2 between the second plastic strips are equal, and L1 is equal to L2.
5. The pre-laid EVA waterproofing membrane according to claim 4, characterized in that: A plurality of third plastic strips are sequentially arranged at intervals on one side of the second plastic strip away from the first plastic strip. The third plastic strips are staggered with the first plastic strip at a predetermined second angle, and a distance L3 between the third plastic strips is equal to L2.
6. The pre-laid EVA waterproofing membrane according to any one of claims 3 to 5, characterized in that: The cross-sectional areas of the 1st, 3rd, 5th, ... 2n-1st strips of the first plastic strip are the third cross-sectional areas, and the cross-sectional areas of the 1st, 3rd, 5th, ... 2n-1st strips of the second plastic strip are the fourth cross-sectional areas; the third cross-sectional area is larger than the first cross-sectional area; the fourth cross-sectional area is larger than the second cross-sectional area.
7. The pre-laid EVA waterproofing membrane according to any one of claims 2 to 5, characterized in that: The first, third, fifth, ..., 2n-1th strips of the first plastic strip further comprise reinforcing fibers, and the first, third, fifth, ..., 2n-1th strips of the second plastic strip further comprise reinforcing fibers.
8. The pre-laid EVA waterproofing membrane according to claim 5, characterized in that: The first angle is 90 degrees, and the second angle is 45 degrees.
9. The pre-laid EVA waterproofing membrane according to claim 1, characterized in that: The thickness of the plastic grid (1) is 0.2-4.0 mm; the thickness of the transparent EVA waterproof board (2) is 0.9-4.0 mm; and the thickness of the transparent oxygen barrier layer (3) is 0.01-0.2 mm.