Steel sheet waterstop coated with bituminous waterproof layer and manufacturing method

Abstract

The present application relates to a kind of steel plate waterstop coated with asphalt waterproof layer and manufacturing method, it is related to the prefabricated component field in subway engineering.It includes: galvanized steel plate base body;EVA hot melt adhesive and waterproof asphalt adhesive layer, coating in galvanized steel plate base body surface in sequence, the galvanized steel plate base body surface is equipped with embossing;Isolation film, covering the galvanized steel plate base body after coating processing.The present application increases surface roughness and specific surface area by the embossing structure of galvanized steel plate base body surface, forms mechanical anchoring effect;EVA hot melt adhesive layer infiltrates embossing gap and is jointly constructed modulus gradient with waterproof asphalt adhesive layer, the rigid interface of steel plate and concrete is converted into flexible transition layer, and structural deformation stress is buffered;Isolation film covers protection, so that asphalt adhesive layer keeps clean viscoelastic state in storage and transportation process, after tearing off in field construction, asphalt layer is directly formed chemical bonding with concrete, effectively blocks the leakage channel of water molecule along steel plate interface.

Description

Technical Field

[0001] This invention relates to the field of prefabricated components in subway engineering, specifically to a steel plate waterstop coated with an asphalt waterproof layer and its manufacturing method. Background Technology

[0002] As the lifeline of urban transportation, the operational safety and structural durability of subway projects are crucial during normal use. With the promotion of prefabricated construction technology in subway projects, the main structures of subway tunnels and stations are increasingly assembled from prefabricated components. This construction method places higher demands on the waterproofing system of the structure: the joints between components become the weakest link in waterproofing in subway projects; waterstops are a key structure designed to address these issues. Currently commonly used waterstop measures include rubber waterstops, steel-edged rubber waterstops, and steel plate waterstops. Among them, steel plate waterstops are widely used in basements and water tanks of industrial and civil buildings due to their simple structure, convenient construction, low cost, and good rigid support.

[0003] However, in prefabricated underground engineering, the number of assembly joints between precast components is large and their spatial distribution is complex. Furthermore, the high requirements for positioning accuracy and interface matching during component assembly make the inherent defects of steel plate waterstops more prominent. From a microscopic perspective, steel plates and concrete are two completely different materials. The surface of the steel plate is smooth, and the bond between it and the concrete is merely a simple mechanical interlocking, leaving inherently gaps that are difficult to completely fill. Under water pressure or concrete shrinkage, water molecules easily form leakage channels along the interface between the steel plate and concrete, leading to waterstop failure. On the other hand, as a rigid material, when the structure deforms due to factors such as temperature changes and foundation settlement, the steel plate cannot adapt to deformation through its own elasticity like a rubber waterstop. This easily leads to stress concentration at the edges of the steel plate, causing cracks in the surrounding concrete and creating new leakage paths. From a durability perspective, although the steel plate surface is galvanized, the galvanized layer may gradually wear away under long-term burial in humid environments or groundwater erosion conditions, causing the steel plate substrate to corrode. The expansion of corrosion products can compress the surrounding concrete, accelerating the damage to the waterproofing system. More importantly, when the tunnel structure develops micro-cracks due to foundation deformation or external loads, traditional steel plate waterstops lack any self-healing or active repair capabilities and cannot fill or block these tiny seepage channels. This limitation means that subway projects using steel plate waterstops may still experience leakage problems after long-term operation, requiring additional measures such as grouting repairs to maintain the waterproofing effect.

[0004] Therefore, it is essential to develop a new type of waterstop that retains the physical anchoring advantages of traditional steel plate waterstops while adding chemical bonding and self-healing functions to fundamentally solve the problem of interface leakage and improve the long-term reliability of waterproofing in underground engineering. Summary of the Invention

[0005] To address the shortcomings of the prior art, this invention provides a steel plate waterstop coated with an asphalt waterproof layer and its manufacturing method, which solves the problems of interface water seepage and poor durability.

[0006] The technical solution of this invention is as follows:

[0007] In a first aspect, the present invention provides a steel plate waterstop coated with an asphalt waterproof layer, comprising:

[0008] Galvanized steel sheet substrate;

[0009] EVA hot melt adhesive and waterproof asphalt adhesive layer are sequentially coated on the surface of galvanized steel plate substrate, the surface of which is embossed;

[0010] A release film is used to cover the coated galvanized steel sheet substrate.

[0011] As a preferred embodiment, the embossing includes oblique lines and horizontal sections extending from both ends of the oblique lines, which are evenly spaced along the length of the steel plate and form several columns distributed on the surface of the galvanized steel plate substrate.

[0012] Furthermore, the embossing depth is 0.3-0.8mm.

[0013] Furthermore, the embossing is performed using cold roll forming.

[0014] Furthermore, the distribution of several columns includes: a first column and a second column extending along the length of the steel plate, wherein the second column is offset relative to the first column by half a embossing spacing along the length of the steel plate.

[0015] As a preferred embodiment, the thickness of the galvanized steel sheet substrate is 2-4mm, the width of the galvanized steel sheet substrate is not less than 300mm, the bending angle at both ends of the galvanized steel sheet substrate is 45-50°, and the bending length is 25-35mm.

[0016] As a preferred option, the EVA hot melt adhesive coating thickness is 2.0-3.0 mm.

[0017] As a preferred option, the waterproof asphalt bonding layer is SBS modified asphalt.

[0018] Furthermore, the coating thickness of SBS modified bitumen is 2.0-5.0 mm.

[0019] Furthermore, SBS modified bitumen includes 18%-23% waste tire rubber powder and approximately 3%-6% DWMA warm mix agent.

[0020] As a preferred technical solution, the release film is a silicone oil release film with a thickness of 0.05-0.15 mm.

[0021] As a preferred technical solution, waste tire rubber powder must meet the following requirements: sieve residue <10%, relative density between 1.10-1.30 g / cm3, moisture content <1%, iron content <0.03%, fiber content <1%, ash content ≤8%, acetone extract ≤16%, carbon black content ≥28%, rubber hydrocarbon content ≥48%, and solubility ≥16%.

[0022] Secondly, the present invention provides a method for manufacturing a coated asphalt waterproof layer, used to prepare a steel plate waterstop with a coated asphalt waterproof layer, comprising the following steps:

[0023] Step a. Degrease, remove dust and surface activate the steel plate substrate, galvanize the steel plate surface and make several rows of embossing by cold pressing patterned roller method;

[0024] Step b. Heat the EVA hot melt adhesive to 180℃ and then impregnate it on the surface of the steel plate. Cool and solidify to form a physical anchor. Control the thickness of the EVA hot melt adhesive to 2-3mm.

[0025] Step c. Heat the modified asphalt to a molten state at 160-200℃, and apply it evenly to the surface of the anti-corrosion primer by scraping, rolling or spraying. The coating thickness is controlled at 2.0-5.0 mm.

[0026] Step d. Apply a release film to the surface of the asphalt bonding layer and compact it with a pressure roller to remove air bubbles;

[0027] Step e. After cooling to room temperature, cut into the designed length and stack and package according to specifications.

[0028] Furthermore, step c includes:

[0029] Step c1. Preparation of DWMA warm mix admixture mother liquor and asphalt dispersion:

[0030] Stearamide and polyoxyethylene ether auxiliary surfactants are dissolved in mineral oil carrier at a mass ratio of (2-3):1, heated to 120-130℃ and stirred to melt, forming an amide-based surfactant mother liquor, which is the effective component of the DWMA warm mix agent.

[0031] The mother liquor is slowly injected into SBS modified asphalt at 160-200℃ at a dosage of 3%-6%. The mixture is stirred at 3000-5000 rpm for 10-15 minutes in a high-shear dispersion device to allow surfactant molecules to oriented and form a nano-micelle dispersion structure on the asphalt surface, thereby reducing the surface tension of the asphalt to below 20 mN / m and obtaining warm-mix modified asphalt.

[0032] Step c2. Add waste tire rubber powder

[0033] Preheat 40-80 mesh waste tire rubber powder to 110℃ and remove moisture, then add it in two batches (18%-23%) to the warm-mix modified asphalt obtained in step c1:

[0034] First, add 60% rubber powder and stir at 1500 rpm for 10 minutes to utilize the micelle structure to coat the powder surface;

[0035] Add the remaining 40% and stir at 2000 rpm for 15 minutes;

[0036] Then, stir at low speed at 175-180℃ for 30 minutes to allow the rubber powder to fully swell and form a stable micelle-rubber powder composite dispersion system;

[0037] Finally, the temperature is lowered to 130-150℃ at a rate of 5℃ / min to obtain a low-temperature construction type waterproof asphalt adhesive layer for application in step c.

[0038] In this scheme, the nano-micelle dispersion structure constructed in step c1 has a particle size of 10-50 nm, which allows the lipophilic end of the amide surfactant to embed into the gum component of SBS modified asphalt, while the hydrophilic end forms a steric hindrance layer, thus providing a stable suspension carrier for waste tire rubber powder in step c2. At the same time, the temporary viscosity reduction effect achieved by the surface activity technology reduces the viscosity by 40-50% at 130-150℃, which not only meets the requirements of the scraper / roller coating process in step c, but also avoids the risk of thermal damage to the already cured EVA hot melt adhesive layer with a melting point of about 80-100℃ in step b by high-temperature coating at 180℃, ensuring the interfacial stability of the steel plate-EVA-asphalt three-layer structure.

[0039] Furthermore, the waste tire rubber powder mentioned in step c2 is 40-80 mesh and meets the following requirements: sieve residue less than 10%, relative density between 1.10-1.30 g / cm³, moisture content less than 1%, iron content less than 0.03%, fiber content less than 1%, ash content not higher than 8%, acetone extract not higher than 16%, carbon black content not lower than 28%, rubber hydrocarbon content not lower than 48%, and solubility not lower than 16%.

[0040] According to the above-described solution, the beneficial effects of this invention are as follows:

[0041] This invention increases surface roughness and specific surface area by embossing the surface of the galvanized steel plate substrate, forming a mechanical anchoring effect; the EVA hot melt adhesive layer wets the embossed gaps and together with the waterproof asphalt adhesive layer to form a modulus gradient, transforming the rigid interface between the steel plate and concrete into a flexible transition layer, buffering structural deformation stress; the protective film covering keeps the asphalt adhesive layer clean and viscoelastic during storage and transportation, and after being removed during on-site construction, the asphalt layer directly forms a chemical bond with the concrete, effectively blocking the leakage channels of water molecules along the steel plate interface;

[0042] Furthermore, the present invention forms a geometric interlocking through the embossed structure on the surface of the galvanized steel plate substrate, and the columnar distribution of oblique and horizontal segments generates a multi-directional mechanical anchoring effect.

[0043] By constructing a nano-micelle dispersion structure in SBS modified asphalt using stearamide surfactant, stable suspension of waste tire rubber powder is achieved, preventing particle agglomeration and sedimentation. Surface activity technology is used to reduce the surface tension of the asphalt, lowering the construction temperature to the range of 130-150℃. This meets the requirements of both scraper and roller coating processes while avoiding the risk of thermal damage to the cured EVA hot melt adhesive layer caused by high-temperature coating, ensuring the interfacial stability of the steel-EVA-asphalt three-layer structure. The composite dispersion system formed by micelles encapsulating rubber powder imparts high elongation at break to the asphalt layer, significantly improving its flexibility to adapt to construction joint deformation.

[0044] In the waterproof asphalt adhesive layer, waste tire rubber powder and SBS modified asphalt form an elastic interpenetrating network, giving the coating the ability to self-heal when micro-cracks occur in the concrete. The 45-50° bending structure at both ends of the steel plate can extend the water seepage path and form a flow-blocking effect, disperse the structural deformation stress and avoid cracking of the edge concrete. It can also be adapted to the geometry of the joints of prefabricated components, realizing a prefabricated construction mode of factory pre-bonding and rapid on-site activation. EVA hot melt adhesive and SBS modified asphalt, being both polyolefin materials, have matching solubility parameters and form a dense eutectic interpenetrating structure, which greatly improves the interlayer bonding strength and interface stability. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention.

[0046] Figure 2 This is a schematic diagram of the construction state of the present invention.

[0047] Figure 3 This is a schematic diagram of the embossed structure on the steel plate surface in this invention.

[0048] In the diagram, 1. Galvanized steel sheet substrate; 2. EVA hot melt adhesive layer; 3. Waterproof asphalt adhesive layer; 4. Release membrane; 5. Concrete base layer; 6. Embossing. Detailed Implementation

[0049] To better understand the purpose, technical solution, and technical effects of this invention, the invention will be further explained and described below in conjunction with the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also stated that the embodiments described below are only for explaining this invention and are not intended to limit this invention.

[0050] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intermediate component.

[0051] The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed when in use, or the orientation or positional relationship in which a person skilled in the art would normally understand it, or the orientation or positional relationship in which the product is usually placed when in use. It is only for the purpose of facilitating the description of this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0052] Example 1: Manufacturing of Steel Plate Waterstop Structure

[0053] like Figures 1-3 As shown, this embodiment provides a steel plate waterstop coated with an asphalt waterproof layer and its manufacturing method. The manufacturing method includes the following steps:

[0054] Step a: Pretreatment and embossing of the steel plate substrate

[0055] A 3mm thick and 300mm wide Q235 steel plate was selected as the substrate. First, degreasing, dust removal, and surface activation treatment were performed. The plate was immersed in an alkaline degreasing agent at 60℃ for 10 minutes to remove surface oil. Then, high-pressure air was used to blow away loose dust. Finally, surface activation treatment was performed, using sandblasting to achieve a surface cleanliness level of Sa2.5.

[0056] After surface activation, the steel plate is hot-dip galvanized, with the zinc coating thickness controlled at 80-120 μm, forming a galvanized steel plate substrate 1. Subsequently, embossing 6 is created on the surface of the steel plate using a cold-pressed patterned roller method. The embossing 6 includes oblique line segments and horizontal segments extending from both ends of the oblique line segments, evenly spaced along the length of the steel plate, forming several columns distributed on the surface of the galvanized steel plate substrate 1.

[0057] Specifically, in this embodiment, the depth of the embossing 6 is controlled at 0.5mm, the angle between the oblique segment and the horizontal segment is 45°, and the spacing between adjacent embossing 6 is 20mm; the distribution of several columns includes a first column and a second column extending along the length of the steel plate, with the second column offset relative to the first column by half the spacing of the embossing 6 (i.e., 10mm), forming a staggered arrangement to enhance the multi-directional mechanical anchoring effect.

[0058] Step b: Apply EVA hot melt adhesive layer 2

[0059] Ethylene-vinyl acetate copolymer (EVA) hot melt adhesive is heated to 180°C to completely melt it, and then uniformly wetted onto the surface of galvanized steel substrate 1 using a roller coating process. During the coating process, the adhesive layer thickness is controlled to be 2.5 mm using a scraper to ensure that the adhesive fully fills the gaps in the embossing 6. After cooling and curing, it forms a physical anchor. The EVA hot melt adhesive has a tensile strength ≥3 MPa, an elongation at break ≥300%, and a Shore hardness between 82 and 90.

[0060] Step c1: Preparation of DWMA warm mix admixture mother liquor and asphalt dispersion

[0061] Stearamide and polyoxyethylene ether auxiliary surfactants were dissolved in mineral oil carrier at a mass ratio of 2.5:1, and heated to 125°C and stirred for 30 minutes to form amide-based surfactant mother liquor.

[0062] SBS modified asphalt was heated to 180°C, and the above mother liquor was slowly injected into the asphalt at a dosage of 4.5%. The mixture was stirred at 4000 rpm for 12 minutes in a high-shear dispersion device. The surfactant molecules were oriented on the surface of the asphalt to form a micelle dispersion structure with a particle size of 20-40 nm. The surface tension of the asphalt was reduced to 18 mN / m, thus obtaining warm-mix modified asphalt.

[0063] Step c2: Adding waste tire rubber powder

[0064] 40-80 mesh waste tire rubber powder is preheated to 110℃ and kept at that temperature for 2 hours to remove moisture. The rubber powder meets the following requirements: 8% sieve residue, relative density 1.20 g / cm³, moisture content 0.5%, iron content 0.02%, fiber content 0.8%, ash content 6%, acetone extract 12%, carbon black content 30%, rubber hydrocarbon content 50%, and solubility 18%.

[0065] The rubber powder was added in two batches at a dosage of 20% to the warm-mix modified asphalt obtained in step c1: first, 12% of the rubber powder was added and stirred at 1500 rpm for 10 minutes to allow the micelle structure to coat the powder surface; then, the remaining 8% was added and stirred at 2000 rpm for 15 minutes. Subsequently, the mixture was stirred at 178℃ and 500 rpm for 30 minutes to allow the rubber powder to fully swell and form a stable micelle-rubber powder composite dispersion system. Finally, the mixture was cooled to 140℃ at a rate of 5℃ / min to obtain the low-temperature construction type waterproof asphalt adhesive layer 3.

[0066] Step c: Apply waterproof asphalt adhesive layer 3

[0067] The modified asphalt obtained in step c2 is kept in a molten state at 140℃ and uniformly coated onto the surface of the EVA hot melt adhesive layer 2 formed in step b using a scraping process; the coating thickness is controlled at 3.5mm to ensure complete coverage of the EVA layer; the asphalt adhesive layer has viscoelasticity at room temperature, a bonding strength with concrete ≥1.0MPa, a softening point ≥105℃, and low-temperature flexibility up to -20℃ without cracking.

[0068] Step d: Lamination of the separator membrane 4

[0069] A silicone release film with a thickness of 0.1 mm is laminated onto the surface of the asphalt bonding layer as a release film 4. A pressure roller is used to compact the release film with a pressure of 0.3 MPa to remove air bubbles between layers and ensure that the release film 4 is tightly bonded to the asphalt layer to prevent them from sticking together during storage and transportation.

[0070] Step e: Cut the packaging

[0071] After the composite waterstop is cooled to room temperature, it is cut into sections according to the design length (usually 6m or 9m). After passing the inspection, it is stacked and packaged according to specifications to obtain the finished steel plate waterstop coated with asphalt waterproof layer.

[0072] Example 2: Construction method of steel plate waterstop

[0073] This embodiment provides a specific construction method for waterproofing construction joints using the waterstop strip described in Embodiment 1, including the following steps:

[0074] Step 1: Grassroots Processing

[0075] Clean the concrete base layer 5 at construction joints or settlement joints, and use a high-pressure water gun to wash away floating dust and loose particles to ensure that the base layer is flat, dry, and free of floating dust and oil stains; repair and smooth any uneven areas with cement mortar, and use polymer cement mortar to level areas with a depression depth greater than 5mm to ensure that the flatness deviation of the base layer does not exceed 3mm / 2m.

[0076] Step 2: Positioning the waterstop

[0077] According to the design drawings, mark the control line for the installation of the waterstop at the construction joint. The control line should be located in the middle of the concrete section. Cut the waterstop to the designed length, keeping the cut clean. Remove the silicone release film from the surface of the waterstop to expose the waterproof asphalt adhesive layer. Attach the waterstop to the base layer or reinforcing steel according to the control line, and gently tap it from the middle to both sides with a rubber mallet to ensure that the asphalt adhesive layer is tightly bonded to the base layer without any hollow areas or wrinkles. At corners, the waterstop should be gently bent to the required angle, usually 90° or 135°, with a bending length of 40mm, to avoid sharp bends that could cause steel plate breakage or coating peeling.

[0078] Step 3: Overlap Treatment

[0079] The overlap length between adjacent waterstop sections shall not be less than 100mm; the isolation membrane 4 shall be removed at the overlap and connected by hot-melt welding: use a hot air gun to uniformly heat the asphalt layer at the overlap to 160-180℃, and press it tightly immediately after the asphalt melts, and squeeze out a small amount of asphalt grout to ensure that a continuous and sealed waterproof barrier is formed at the overlap.

[0080] For areas unsuitable for hot-melt construction, a special cold adhesive can be used: apply asphalt-based cold adhesive to the overlapping surfaces, press and fix for 24 hours before proceeding with subsequent work.

[0081] Step 4: Rebar Binding

[0082] Tie the reinforcing steel cage at the construction joint according to the design requirements, taking care to protect the waterstop from being punctured or displaced by the reinforcing steel. Avoid tying the reinforcing steel to the center of the waterstop; if necessary, use a dedicated reinforcing steel bracket to secure the waterstop. The waterstop should be located in the middle of the concrete section, with an installation deviation not exceeding ±10mm. When welding reinforcing steel, take shielding measures to prevent weld slag from burning the asphalt coating.

[0083] Step 5: Template erection

[0084] When setting up the formwork, ensure that the waterstop is in the correct position and that the formwork is in close contact with the waterstop. Set up grout-stopping measures on both sides of the waterstop, such as using sponge strips or rubber strips to fill the gap between the formwork and the waterstop to prevent grout leakage and contamination of the asphalt layer. The exposed part of the waterstop should be covered with plastic film for protection to avoid contamination by formwork release agent or concrete grout.

[0085] Step 6: Concrete pouring

[0086] Before pouring concrete, a concealed works inspection of the waterstop should be conducted to confirm that its position is accurate, its fixation is firm, and its surface is free of contamination. When pouring concrete, first pour a small amount of concrete on both sides of the waterstop simultaneously and vibrate it thoroughly to ensure that the asphalt coating is in close contact with the concrete and forms a chemical bond. When continuing to pour, avoid direct impact of concrete on the waterstop, and the vibrator should not directly contact the steel plate to prevent the coating from peeling off. The concrete slump should be controlled at 160-200mm to ensure that it can fully fill the gaps of the embossed 6, forming a dual mechanism of mechanical anchoring and chemical bonding with the EVA hot melt adhesive layer 2 and the asphalt layer.

[0087] Step 7: Curing and Demolding

[0088] After the concrete has set, water should be sprayed or covered with a geotextile for curing, and the curing time should be no less than 14 days. After the concrete reaches the design strength, the formwork should be removed, and the position and sealing effect of the waterstop in the concrete should be checked. Observe whether there is any damage or displacement. When removing the formwork, care should be taken to protect the exposed waterstop from being damaged. If the exposed part is contaminated, it should be cleaned in time.

[0089] Step 8: Subsequent Construction

[0090] Before pouring concrete for adjacent sections, clean the surface of the exposed waterstop to ensure it is free of contamination and damage. Remove the release liner 4 from the adjacent waterstop sections and continue construction using steps two through seven as described above to form a continuous waterproof barrier.

[0091] Example 3: Variant Implementation

[0092] As another implementation, the steel plate waterstop can be coated with waterproof asphalt adhesive layer 3 on only one side and epoxy anti-rust primer on the back side, which is suitable for dry environments or waterproofing on the back side; in this case, care should be taken to install it with the coated side facing the water-facing side.

[0093] The embossing 6 can also adopt other geometric shapes, such as rhombuses, dots, or wavy lines, as long as it can increase the surface roughness and specific surface area to form a mechanical anchoring effect. The thickness of the EVA hot melt adhesive layer 2 can be adjusted within the range of 2.0-3.0mm, and the thickness of the asphalt adhesive layer can be adjusted within the range of 2.0-5.0mm according to the waterproofing level requirements.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A steel plate waterstop coated with an asphalt waterproof layer, characterized in that, include: Galvanized steel sheet substrate; EVA hot melt adhesive and waterproof asphalt adhesive layer are sequentially coated on the surface of galvanized steel plate substrate, the surface of which is embossed; A release film is used to cover the coated galvanized steel sheet substrate. Embossing includes oblique lines and horizontal lines extending from both ends of the oblique lines, which are evenly spaced along the length of the steel plate and form several columns distributed on the surface of the galvanized steel plate substrate.

2. The steel plate waterstop with an asphalt-coated waterproof layer according to claim 1, characterized in that, The distribution of the plurality of columns includes: a first column and a second column extending along the length of the steel plate, wherein the second column is offset relative to the first column by half a embossing spacing along the length of the steel plate.

3. The steel plate waterstop with an asphalt-coated waterproof layer according to claim 1, characterized in that, Embossing depth: 0.3-0.8mm.

4. A steel plate waterstop with an asphalt-coated waterproof layer according to claim 1, characterized in that, The EVA hot melt adhesive coating thickness is 2.0-3.0 mm.

5. A steel plate waterstop with an asphalt-coated waterproof layer according to claim 1, characterized in that, The waterproof asphalt bonding layer is made of SBS modified asphalt.

6. A steel plate waterstop with an asphalt-coated waterproof layer according to claim 5, characterized in that, SBS modified bitumen includes 18%-23% waste tire rubber powder and about 3%-6% DWMA warm mix agent.

7. A steel plate waterstop with an asphalt-coated waterproof layer according to claim 5, characterized in that, The release film is a silicone oil release film with a thickness of 0.05-0.15 mm.

8. A method for manufacturing an asphalt-coated waterproof layer, characterized in that, The preparation of a steel plate waterstop with an asphalt-coated waterproof layer as described in any one of claims 1-7 includes the following steps: Step a. Degrease, remove dust and surface activate the steel plate substrate, galvanize the steel plate surface and make several rows of embossing by cold pressing patterned roller method; Step b. Heat the EVA hot melt adhesive to 180℃ and then impregnate it on the surface of the steel plate. Cool and solidify to form a physical anchor. Control the thickness of the EVA hot melt adhesive to 2-3mm. Step c. Heat the modified asphalt to a molten state at 160-200℃, and apply it evenly to the surface of the anti-corrosion primer by scraping, rolling or spraying. The coating thickness is controlled at 2.0-5.0 mm. Step d. Apply a release film to the surface of the asphalt bonding layer and compact it with a pressure roller to remove air bubbles; Step e. After cooling to room temperature, cut into the designed length and stack and package according to specifications.

9. A method for manufacturing an asphalt-coated waterproof layer according to claim 8, characterized in that, Step c also includes: Step c1. Preparation of DWMA warm mix admixture mother liquor and asphalt dispersion: Stearamide and polyoxyethylene ether auxiliary surfactants are dissolved in mineral oil carrier at a mass ratio of (2-3):1, and heated to 120-130℃ and stirred to melt, forming a mother liquor of amide surfactant; The mother liquor is slowly injected into SBS modified asphalt at 160-200℃ at a dosage of 3%-6%. The mixture is stirred at 3000-5000 rpm for 10-15 minutes in a high-shear dispersion device to allow surfactant molecules to oriented and form a nano-micelle dispersion structure on the asphalt surface, thereby reducing the surface tension of the asphalt to below 20 mN / m and obtaining warm-mix modified asphalt.

10. A method for manufacturing an asphalt-coated waterproof layer according to claim 9, characterized in that, Step c1 is followed by: Step c2. Add waste tire rubber powder Preheat 40-80 mesh waste tire rubber powder to 110℃ and remove moisture, then add it in two batches (18%-23%) to the warm-mix modified asphalt obtained in step c1: Add 60% rubber powder and stir at 1500 rpm for 10 minutes to utilize the micelle structure to coat the powder surface; Add the remaining 40% and stir at 2000 rpm for 15 minutes; Then, stir at low speed at 175-180℃ for 30 minutes to allow the rubber powder to fully swell and form a stable micelle-rubber powder composite dispersion system; Finally, the temperature is lowered to 130-150℃ at a rate of 5℃ / min to obtain a low-temperature construction type waterproof asphalt adhesive layer for application in step c.

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