Construction method of inverted roof anti-cracking protective layer structure

Abstract

The present invention discloses a construction method for an inverted roof anti-cracking protective layer structure, the method comprising the following steps: performing secondary smoothing and calendering on the floor slab concrete of the roof structure layer, constructing a waterproof layer, constructing the sides and separation joints of the drainage ditch, constructing a thermal insulation layer and an isolation layer, laying a steel mesh on the surface of the isolation layer, constructing a protective layer, sealing the separation joints and the drainage ditch, and constructing a finishing layer; by arranging separation joints on the waterproof layer, the separation joints are connected from top to bottom, and constructing a slope layer and a rigid waterproof protective layer through the separation joints, it is beneficial to simplify the construction process, reduce the construction budget, and improve construction efficiency; using the separation joints as ribs for the protective layer can reduce the difficulty of controlling the flatness and slope of the slope layer; merging the slope layer into the rigid waterproof protective layer can increase the thickness of the rigid waterproof protective layer, prevent large-scale cracking of the concrete of the rigid waterproof protective layer, and improve the construction quality of the inverted roof and prevent water seepage from the roof.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a construction method of an inverted roof anti-cracking protective layer structure. Background Art

[0002] Roofing is a crucial component of construction projects, and its quality directly impacts the building's functionality. Roofing structures are categorized into inverted and upright roofs. Inverted roofs, also known as inverted insulated roofs, feature an insulation layer positioned above the waterproof layer, protecting it from damage caused by thermal stress, UV rays, and other factors. This prevents cracking and aging, thereby extending its service life, saving maintenance costs, and generating high economic benefits.

[0003] The existing inverted roof structure of a residential building consists of the following structures: roof structure layer, slope leveling layer, waterproof layer, thermal insulation layer, isolation layer, protective layer, and finishing layer. The roof is generally sloped at a 2% gradient, and the total thickness of each layer is 150-250mm. The following problems often arise in the construction of inverted roofs using this structure:

[0004] First, the construction process is complicated, the construction efficiency is low and the construction quality is difficult to guarantee, which can easily cause the concrete to crack and affect the waterproof performance of the roof structure.

[0005] Secondly, since the slope leveling layer is set next to the roof structure layer, its slope is 2%. The slope leveling layer is usually constructed with fine stone concrete. The thinnest part of the slope leveling layer is only 30mm, which is very easy to crack. Similarly, the protective layer is constructed on the insulation layer by combining reinforcement and fine stone concrete. The thinnest part of the protective layer is only 40mm, and its thickness is very low. It is very easy to crack due to factors such as thermal stress, ultraviolet rays and the shrinkage of concrete itself. Once cracking and leakage occur, it is extremely difficult to repair the leakage, and the insulation layer often needs to be turned over, resulting in material waste and increased maintenance costs.

[0006] Third, when constructing the slope leveling layer, the elevation is usually found by marking points, and the slope and flatness are difficult to control, which affects the construction quality.

[0007] Fourthly, during the construction of the separation joint after the construction of the slope layer and the waterproof layer is completed, it is easy to cause the concrete of the slope layer to crack when cutting the joint.

[0008] The Chinese invention patent with authorization announcement number CN 104499658 B proposes an "active breathing moisture-proof and steam-exhausting inverted roof system and its construction method", in which the waterproof layer is constructed after the leveling layer is dry. The waterproof layer is located in a lower layer, away from the influence of atmospheric temperature changes and water vapor, which can extend the life of the waterproof layer; the outermost two layers of the roof are the slope layer and the protective layer, respectively. The roof slope layer and the protective layer work together to increase the surface stiffness of the roof; however, it is also difficult to control the slope and flatness of the slope layer when using this construction method, which affects construction efficiency and construction quality. During the construction process, there will also be large-scale cracking of the concrete in the thinner parts of the slope layer, affecting the waterproof performance of the roof. Summary of the Invention

[0009] At least one of the purposes of the present invention is to provide a construction method for an inverted roof anti-cracking protective layer structure in order to overcome the problems existing in the above-mentioned prior art. By arranging a waterproof layer on the roof structure layer and merging the slope layer and the protective layer, the thickness of the slope layer can be increased, the concrete cracking at the thinnest part of the slope layer can be prevented, and the waterproof performance of the roof can be improved. By arranging a separation joint on the waterproof layer, the difficulty of controlling the slope and flatness of the slope layer can be reduced, thereby improving the construction quality.

[0010] In order to achieve the above objectives, the technical solutions adopted by the present invention include the following aspects.

[0011] A construction method for an inverted roof anti-cracking protective layer structure is disclosed. The inverted roof anti-cracking protective layer structure comprises: a roof structure layer, a waterproof layer provided on the surface of the roof structure layer, a separation seam provided on the surface of the waterproof layer, an insulation layer, an isolation layer, and a protective layer provided on both sides of the separation seam and on the surface of the waterproof layer from the inside to the outside, and a drainage ditch provided near the edge of the roof wall structure. The specific construction method comprises the following steps:

[0012] Step 1: Perform secondary smoothing and calendering on the floor slab concrete of the roof structure layer to meet the requirements of waterproof layer construction;

[0013] Step 2: After the roof structure layer in step 1 meets the waterproof layer construction requirements, waterproof layer construction is carried out on the surface of the roof structure layer;

[0014] Step 3: According to the design and construction requirements, after the waterproof layer is completed and the water storage test is passed, the drainage ditch side and separation joints are constructed on the surface of the waterproof layer;

[0015] Step 4: Construction of insulation layer and isolation layer;

[0016] Clean up the slurry and debris generated by the construction of the separation joints and drainage ditches, and use the dry laying method to construct the insulation layer; after the insulation layer is laid and passed the acceptance, lay geotextile on the surface of the insulation layer as an isolation layer;

[0017] Step 5: Lay steel mesh on the surface of the isolation layer;

[0018] Step 6: Construction of protective layer;

[0019] Paste ash cakes and determine elevation: Based on the 50cm elevation control line on the wall protruding from the roof, use a level to control the height of the protective layer, and paste a ash cake every 1.5m or so;

[0020] Pouring concrete: The height of the protective layer should be equal to the top of the separation joint. Pay attention to the protection of the finished product of the separation joint during construction;

[0021] Maintenance: After the protective layer is constructed, cover it with a layer of geotextile within 12 hours, water it for maintenance, and clean up temporary protective coverings and blockages;

[0022] Step 7: Seal the separation joints and drainage ditches;

[0023] Step 8: Apply decorative tiles or floor paint on the surface of the protective layer as a finishing layer to enhance the decorative beauty of the inverted roof structure and improve the visual effect.

[0024] Preferably, the partition joint in step three is a double-sided structure and is built with cement bricks; when constructing the partition joint, multiple layers of cement bricks are laid with line mortar, and the specific number of layers is determined according to the overall thickness of the roof structure. The partition joint runs through from top to bottom and its width is 1~2 cm.

[0025] Preferably, after the separation joint is constructed, decorative bricks are laid along the top of both sides of the separation joint using mortar or extruded board separation strips are laid using mortar to form a decorative layer. The laying thickness of the decorative bricks or extruded board separation strips is 15 to 20 mm to ensure that the separation joint is straight.

[0026] Preferably, when constructing the drainage ditch in step three, cement bricks are laid in a single-sided masonry method near the edge of the roof wall. The cement bricks on one side of the drainage ditch are laid first, and then the cement bricks on the other side of the drainage ditch are laid. The number of cement brick layers is determined according to the overall thickness of the roof structure, and the masonry width of the drainage ditch is 300~400mm; when constructing the drainage ditch, a waterproof layer and a drainage ditch surface layer slope leveling layer are constructed in the drainage ditch, and the slope in the drainage ditch is not less than 1%.

[0027] Furthermore, the construction process of the waterproof layer and the slope leveling layer of the drainage ditch surface is as follows: first, the waterproof layer is constructed, and after the construction of the waterproof layer is completed, a thermal insulation mortar layer and an anti-cracking mortar protective layer with pressed fiber mesh are sequentially arranged on the waterproof layer, and the slope of the anti-cracking mortar protective layer is not less than 1%; after the construction of the anti-cracking mortar protective layer is completed, the surface of the cement bricks on the side of the drainage ditch is plastered with anti-cracking mortar with pressed fiber mesh, and ceramic tiles are laid on the side of the drainage ditch in the same way as the decorative layer is laid on the top of the dividing seam.

[0028] Preferably, when constructing the insulation layer in step 4, plate-shaped insulation materials are used to construct the insulation layer, and the plate-shaped insulation materials are placed close to the surface of the base layer. The joints of the plate-shaped insulation materials are staggered, and the gaps between the plates are densely filled with debris of the same type of material.

[0029] Furthermore, the plate-shaped thermal insulation material includes one or more of foam concrete board, mineral wool board, vermiculite board or organic fiber board.

[0030] Preferably, in the step five, when laying the steel mesh on the surface of the isolation layer, pads are used to raise the surface of the steel mesh so that the steel mesh is at a certain distance from the isolation layer to prevent the protective layer from cracking.

[0031] Preferably, when constructing the protective layer in step six, the separation seams constructed in step three are used as ribs to reduce the difficulty of controlling the slope and flatness of the protective layer; the slope of the protective layer is 1% to 2%, and the thickness of the thinnest part of the protective layer is not less than 80 mm.

[0032] Preferably, in step seven, when sealing the partition joint, the waterproof material on the top of the partition joint is removed, and a certain height of medium sand is first poured into the partition joint, leaving a space of 1 to 1.5 cm between the top of the medium sand and the top of the partition joint, and silicone weather-resistant sealant is filled in this space to ensure that no leakage occurs at the partition joint; when sealing the drain ditch, the gap between the drain ditch and the roof wall is filled with drain ditch sealant.

[0033] In summary, due to the adoption of the above technical solution, the present invention has at least the following beneficial effects:

[0034] By setting separation joints on the waterproof layer, the concrete poured in the protective layer can be prevented from cracking due to factors such as temperature, humidity, and structural deformation, thereby improving the construction quality of the roof structure.

[0035] By using the separation joints as the ribs of the protective layer, the difficulty of controlling the slope and flatness of the protective layer can be reduced, and the construction quality of the protective layer can be improved. Compared with the traditional method of finding the elevation by marking points, the construction efficiency can be improved and the construction period can be shortened. The separation joints can also improve the aesthetics of the roof structure construction.

[0036] By building separation joints, large areas of concrete can be divided into small parts, which can prevent the concrete from cracking due to shrinkage stress during the solidification process; by building separation joints, the construction sequence is optimized. Compared with the traditional method of forming separation joints by cutting in the later stage of construction, it can prevent the concrete from cracking due to improper cutting timing when setting the separation joints.

[0037] By setting the slope of the protective layer to 1% to 2%, and merging the protective layer and the slope adjustment layer when constructing the protective layer, it is beneficial to simplify the construction process of the roof structure and improve construction efficiency; merging the protective layer and the slope adjustment layer can also increase the thickness of the protective layer, preventing large-scale cracking of the concrete at the thinnest part of the protective layer due to shrinkage stress, ultraviolet rays and other atmospheric factors, thereby improving the construction quality of the inverted roof structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the inverted roof anti-cracking protective layer according to an exemplary embodiment of the present invention.

[0039] Figure 2 Schematic diagram of a drainage ditch structure according to an exemplary embodiment of the present invention.

[0040] Markings in the figure: 1-roof structure layer, 2-waterproof layer, 3-insulation layer, 4-protective layer, 5-dividing joint, 6-sealing filler, 61-medium sand, 62-silicone weather-resistant sealant, 7-mortar, 8-decorative layer, 9-drainage ditch, 91-thermal insulation mortar layer, 92-anti-cracking mortar protective layer, 93-drainage ditch filler. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments to make the purpose, technical solutions and advantages of the present invention more clearly understood. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] refer to Figure 1 The inverted roof anti-cracking protective layer structure of the exemplary embodiment of the present invention includes a roof structure layer 1, a waterproof layer 2 is provided on the surface of the roof structure layer 1, a separation joint 5 is provided on the surface of the waterproof layer 2, and an insulation layer 3, an isolation layer (not shown in the figure) and a protective layer 4 are sequentially provided on both sides of the separation joint 5 and on the surface of the waterproof layer 2 from the inside to the outside.

[0043] The partition joint 5 is a double-sided structure constructed with cement bricks. The number of layers of cement bricks is determined by the overall thickness of the roof structure (for example, two to three layers of cement bricks can be used depending on the required thickness). Since the partition joint is constructed with cement bricks, it does not need to be cut after the waterproofing and graded layers are completed, saving construction time and preventing concrete cracking caused by cutting the partition joint. The distance d between the two sides of the partition joint 5 is 1 to 2 cm, and a sealing filler 6 is placed between the two sides to prevent leakage at the partition joint 5 and affect the roof's waterproofing performance. The sealing filler 6 consists of medium sand 61 and silicone weathering sealant 62. The silicone weathering sealant 62 is applied above the medium sand 61 and is resistant to ozone, UV rays, and other weathering properties. It can withstand long-term exposure to the atmosphere, ensuring good waterproofing of the partition joint 5. The thickness of the silicone weathering sealant 62 is 1 to 1.5 cm.

[0044] A decorative layer 8 is built on the cement bricks on the top layer of the partition joint 5 through mortar 7 to achieve a decorative effect on the roof and enhance the visual effect of the roof; the decorative layer 8 can be made of decorative bricks or extruded board partition strips. The thickness of the decorative layer 8 is 15~20mm, preferably 20mm, which can ensure that the partition joint is straight and ensure the construction quality of the partition joint and the roof structure; and after the construction of the decorative layer 8 is completed, it can be used as a rib to control the construction thickness, slope and flatness of the protective layer 4 to ensure the construction quality of the inverted roof structure.

[0045] The waterproof layer 2 is constructed with paint or waterproof membrane, and the thermal insulation layer 3 is constructed by dry laying of plate-like thermal insulation materials (such as foam concrete boards, mineral wool boards, vermiculite boards, organic fiber boards, etc., and one or more of them can be selected for combination when in use). The joints of the plate-like thermal insulation materials are staggered, and the gaps between the boards are densely filled with debris of the same type of material; the isolation layer is paved with geotextile, and the surface of the isolation layer is paved with steel mesh (not shown in the figure), and a pad is provided between the steel mesh and the surface of the isolation layer to ensure that the steel mesh and the isolation layer are separated by a certain distance. When pouring concrete, the steel mesh is combined with fine stone concrete to form a rigid waterproof protective layer 4.

[0046] The slope of the protective layer 4 is 1% to 2%, preferably a 2% slope; the thickness of the thinnest part of the protective layer 4 is not less than 80 mm; after the construction of the inverted roof structure is completed, the protective layer 4 has a certain slope, which not only acts as a slope leveling layer, which is conducive to the drainage of roof water, but also acts as a rigid waterproof protective layer, realizing the protection of the roof structure; since the thickness of the thinnest part of the protective layer 4 is not less than 80 mm, after the construction of the protective layer 4 is completed, its thickness is thicker than the thickness of the slope leveling layer and the rigid waterproof protective layer constructed separately, so it can effectively prevent the concrete at the protective layer 4 from large-scale cracking under the influence of its own shrinkage stress, ultraviolet rays and other factors, thereby improving the waterproof performance of the roof structure and reducing maintenance costs.

[0047] refer to Figure 2 , the roof water is discharged into the drainage ditch 9 from the surface of the protective layer. The drainage ditch 9 is also built with cement bricks. The number of cement brick layers is determined according to the overall thickness of the roof structure, and the cement bricks are built on the roof waterproof layer; the drainage ditch 9 can be built in a single-sided masonry method, and its width is 300~400mm, preferably 400mm. The top of the drainage ditch 9 is built with a decorative layer 8 through mortar with heat insulation function; a waterproof layer 2 is arranged between the cement bricks on both sides of the drainage ditch 9, and a thermal insulation mortar layer 91 and an anti-cracking mortar protective layer 92 pressed into a fiber mesh are sequentially arranged on the waterproof layer 2. The slope of the anti-cracking mortar protective layer 92 is not less than 1% to facilitate drainage; the cement brick walls on both sides of the drainage ditch 9 can be plastered with anti-cracking mortar pressed into a fiber mesh to improve the waterproof performance of the drainage ditch; the cement brick walls on both sides of the drainage ditch 9 can also be paved with tiles to improve the decorative effect.

[0048] There is a gap of a certain width between the gutter 9 and the roof wall, and the specific width of the gap is determined according to the construction requirements; the gap is filled with a gutter sealant 93, and the gutter sealant 93 can be made of weather-resistant flexible materials, such as asphalt, ointment, weather-resistant sealant, etc.; the filling height of the gutter sealant 93 is the same as the height of the decorative layer 8 on the top of the gutter (the height of the gutter 9 plus the height of the decorative layer 8), or it can be slightly lower than the height of the decorative layer 8 (for example, 1 to 3 cm). The gutter sealant 93 can prevent rainwater and other accumulated water from seeping into the roof structure layer 1 through the gap between the gutter 9 and the roof wall, which is beneficial to improving the waterproof performance of the roof structure. The gutter sealant 93 also increases the aesthetics of the gutter construction to a certain extent.

[0049] The construction method of the inverted roof anti-cracking protective layer structure according to an exemplary embodiment of the present invention comprises the following steps:

[0050] Step 1: Perform secondary smoothing and calendering on the floor slab concrete of the roof structure layer to meet the requirements of waterproof layer construction;

[0051] Step 2: After the roof structure layer in step 1 meets the waterproof layer construction requirements, waterproof layer construction is carried out on the surface of the roof structure layer;

[0052] Step 3: According to the design and construction requirements, after the waterproof layer is completed and the water storage test is passed, the drainage ditch side and separation joints are constructed on the surface of the waterproof layer;

[0053] The division of the separation joints is carried out according to factors such as the inside and outside corners of the roof and the structural layout. The spacing between adjacent separation joints shall not exceed 6m. When constructing the separation joints, 2 to 3 layers of cement bricks are laid with line mortar (the specific number of layers is determined by the overall thickness of the roof structure). The separation joints are continuous from top to bottom and have a width of 1 to 2cm. After the separation joints are laid, decorative bricks are laid along the top of both sides of the separation joints using mortar or extruded board separation strips are laid using mortar to form a decorative layer. The laying thickness of the decorative bricks or extruded board separation strips is 15 to 20mm to ensure that the separation joints are straight. After the decorative layer is constructed, the top of the separation joints is covered with waterproof material (the covering surface does not affect the subsequent construction of the protective layer) to prevent construction scraps or accumulated water from entering the separation joints and affecting the roof structure.

[0054] The construction of the drainage ditch can be carried out after the construction of the separation joint is completed, or it can be carried out at the same time as the separation joint, or it can be carried out before the construction of the separation joint; when constructing the drainage ditch, use a single-sided masonry method to lay cement bricks near the roof wall, first lay the cement bricks on one side of the drainage ditch, and then lay the cement bricks on the other side of the drainage ditch. The number of cement brick layers is determined according to the overall thickness of the roof structure. The masonry width of the drainage ditch is 300~400mm, and there is a certain gap between the side of the drainage ditch and the roof wall; when constructing the drainage ditch, the waterproof layer and the drainage ditch surface slope layer are constructed in the drainage ditch, and the slope in the drainage ditch is not less than 1%; after the construction of the waterproof layer is completed, a thermal insulation mortar layer and an anti-cracking mortar protective layer with pressed fiber mesh are sequentially arranged on top of the waterproof layer, and the slope of the anti-cracking mortar protective layer is not less than 1%. After the cement bricks on both sides of the gutter are laid, the surface of the cement bricks on the gutter side is plastered with anti-cracking mortar with pressed fiber mesh, and tiles are laid on the gutter side in the same way as the decorative layer is laid on the top of the separation joint to prevent roof water from penetrating into the roof structure through the gutter side and affecting the construction quality of the roof structure;

[0055] Step 4: Construct the insulation layer and isolation layer; clean up the slurry and debris generated by the separation joints and drainage ditch construction, and use the dry laying method to construct the insulation layer; when constructing the insulation layer, preferably use plate-shaped insulation materials, which are placed close to the surface of the base layer (waterproof layer), with the joints of the plate-shaped insulation materials staggered, and the gaps between the plates are densely filled with debris of the same type of material; after the insulation layer is laid and passed the acceptance, lay geotextile on the surface of the insulation layer as an isolation layer;

[0056] Step 5: Lay the steel mesh on the surface of the isolation layer, use pads to raise the surface of the steel mesh, and keep a certain distance between the steel mesh and the isolation layer to prevent the protective layer from cracking.

[0057] Step 6: Construction of protective layer;

[0058] Apply mortar cakes and determine the elevation: Based on the 50cm elevation control line on the wall protruding from the roof, use a level to control the height of the protective layer, applying mortar cakes every 1.5m or so. Use the separation joints constructed in step 3 as reinforcement to reduce the difficulty of controlling the slope and flatness of the protective layer.

[0059] Concrete pouring: The height of the protective layer should be the same as the separation joint (when a decorative layer is installed on the top of the separation joint, the height of the protective layer should be the same as the height of the decorative layer). During construction, pay attention to the protection of the finished separation joint. Use a small vibrator to compact the poured concrete, and use a scraper to find the slope and level it. Before the initial setting of the concrete, use a wooden trowel to smooth it. After the water is absorbed, use a grinder to smooth it again and finish it.

[0060] Maintenance: After the protective layer is constructed, cover it with a layer of geotextile within 12 hours, water it and maintain it, and clean up the temporary protective coverings and blockages. The maintenance period is 7 days.

[0061] Step 7: Seal the partition joints and drains. Remove the waterproof material from the top of the partition joints and fill the partition joints with a certain height of medium sand, leaving a space of 1 to 1.5 cm between the top of the medium sand and the top of the partition joint. Fill this space with silicone weatherproof sealant to prevent leakage at the partition joints. Fill the gap between the drain gutter and the roof wall with drain ditch caulking. Use a weatherproof, flexible material such as asphalt, grease, or weatherproof sealant. The filling height of the drain ditch caulking should not exceed the height of the decorative layer at the top of the gutter to prevent rainwater and other accumulated water from seeping into the roof structure through the gap between the gutter and the roof wall, thereby improving the waterproof performance of the roof structure.

[0062] Step 8: Apply decorative tiles or floor paint on the surface of the protective layer as a finishing layer to enhance the decorative beauty of the inverted roof structure and improve the visual effect.

[0063] The above description is only a detailed description of the specific embodiments of the present invention, and does not limit the present invention. Various substitutions, modifications and improvements made by those skilled in the relevant art without departing from the principles and scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for an inverted roof anti-cracking protective layer structure, characterized in that: The inverted roof anti-cracking protective layer structure includes: a roof structure layer, a waterproof layer provided on the surface of the roof structure layer, a separation seam provided on the surface of the waterproof layer, an insulation layer, an isolation layer, and a protective layer provided on both sides of the separation seam and on the surface of the waterproof layer from the inside to the outside, and a drainage ditch provided near the edge of the roof wall structure; the specific construction method includes the following steps: Step 1: Perform secondary smoothing and calendering on the floor slab concrete of the roof structure layer to meet the requirements of waterproof layer construction; Step 2: After the roof structure layer in step 1 meets the waterproof layer construction requirements, waterproof layer construction is carried out on the surface of the roof structure layer; Step 3: According to the design and construction requirements, after the waterproof layer is completed and the water storage test is passed, the drainage ditch side and separation joints are constructed on the surface of the waterproof layer; Step 4: Construction of insulation layer and isolation layer; Clean up the slurry and debris generated by the construction of the separation joints and drainage ditches, and use the dry laying method to construct the insulation layer; after the insulation layer is laid and passed the acceptance, lay geotextile on the surface of the insulation layer as an isolation layer; Step 5: Lay steel mesh on the surface of the isolation layer; Step 6: Construction of protective layer; Paste ash cakes and determine elevation: Based on the 50cm elevation control line on the wall protruding from the roof, use a level to control the height of the protective layer, and paste a ash cake every 1.5m or so; Pouring concrete: The height of the protective layer should be equal to the top of the separation joint. Pay attention to the protection of the finished product of the separation joint during construction; Maintenance: After the protective layer is constructed, cover it with a layer of geotextile within 12 hours, water it for maintenance, and clean up temporary protective coverings and blockages; Step 7: Seal the separation joints and drainage ditches; Step 8: Apply decorative tiles or floor paint on the surface of the protective layer as a finishing layer to enhance the decorative beauty of the inverted roof structure and improve the visual effect; The separation joint in step 3 is a double-sided structure, which is built with cement bricks. When constructing the separation joint, multiple layers of cement bricks are laid with a line seat mortar. The specific number of layers is determined according to the overall thickness of the roof structure. The separation joint runs through the top and bottom, and its width is 1 to 2 cm. When constructing the protective layer in step six, the separation seams constructed in step three are used as ribs to reduce the difficulty of controlling the slope and flatness of the protective layer; the slope of the protective layer is 1% to 2%, and the thickness of the thinnest part of the protective layer is not less than 80 mm.

2. The construction method of the inverted roof anti-cracking protective layer structure according to claim 1, characterized in that: After the separation joint is completed, decorative bricks are laid along the top of both sides of the separation joint using mortar or extruded board separation strips are laid using mortar to form a decorative layer. The laying thickness of the decorative bricks or extruded board separation strips is 15~20mm to ensure that the separation joint is straight.

3. The construction method of the inverted roof anti-cracking protective layer structure according to claim 2, characterized in that: When constructing the drainage ditch in the step three, cement bricks are laid in a single-sided masonry method near the edge of the roof wall. The cement bricks on one side of the drainage ditch are laid first, and then the cement bricks on the other side of the drainage ditch are laid. The number of cement brick layers is determined according to the overall thickness of the roof structure, and the masonry width of the drainage ditch is 300~400mm; when constructing the drainage ditch, a waterproof layer and a drainage ditch surface layer slope leveling layer are constructed in the drainage ditch, and the slope in the drainage ditch is not less than 1%.

4. The construction method of the inverted roof anti-cracking protective layer structure according to claim 3, characterized in that: The construction process of the waterproof layer and the slope adjustment layer of the drainage ditch surface layer in the drainage ditch is as follows: first construct the waterproof layer, and after the waterproof layer construction is completed, sequentially arrange a thermal insulation mortar layer and an anti-cracking mortar protective layer with pressed fiber mesh on top of the waterproof layer, and the slope of the anti-cracking mortar protective layer is not less than 1%; after the anti-cracking mortar protective layer construction is completed, the surface of the cement bricks on the side of the drainage ditch is plastered with anti-cracking mortar with pressed fiber mesh, and ceramic tiles are laid on the side of the drainage ditch in the same way as the decorative layer is laid on the top of the partition joint.

5. The construction method of the inverted roof anti-cracking protective layer structure according to claim 1, characterized in that: When constructing the insulation layer in step 4, plate-shaped insulation materials are used to construct the insulation layer. The plate-shaped insulation materials are placed close to the surface of the base layer, the joints of the plate-shaped insulation materials are staggered, and the gaps between the plates are densely filled with debris of the same type of material.

6. The construction method of the inverted roof anti-cracking protective layer structure according to claim 5, characterized in that: The plate-shaped thermal insulation material includes one or more of foam concrete board, mineral wool board, vermiculite board or organic fiber board.

7. The construction method of the inverted roof anti-cracking protective layer structure according to claim 1, characterized in that: In the step 5, when laying the steel mesh on the surface of the isolation layer, pads are used to raise the surface of the steel mesh so that the steel mesh is at a certain distance from the isolation layer to prevent the protective layer from cracking.

8. The construction method of the inverted roof anti-cracking protective layer structure according to any one of claims 1 to 7, characterized in that: In the seventh step of sealing the partition joint, the waterproof material on the top of the partition joint is removed, and a certain height of medium sand is first poured into the partition joint, leaving a space of 1 to 1.5 cm between the top of the medium sand and the top of the partition joint. Silicone weather-resistant sealant is filled in this space to ensure that no leakage occurs at the partition joint; when sealing the drain ditch, the gap between the drain ditch and the roof wall is filled with drain ditch sealant.

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