Composite thermal insulation structure of inverted roof and construction method thereof

Abstract

The present application provides a kind of inverted roof composite thermal insulation structure, comprising: thermal insulation layer, filling layer and leveling layer;Thermal insulation layer is provided with a layer of steel mesh sheet in the upper and lower of thermal insulation board respectively, and thermal insulation board is provided with a plurality of through holes for communicating upper and lower steel mesh sheet;Filling material of filling layer flows through the through hole and the gap everywhere, diffuses to the surface of waterproof layer and forms filling layer;The filling material of leveling layer is secondary filled to each gap and is poured to the specified thickness.The present application also provides the construction method of the composite thermal insulation structure, using twice pouring mode, " filling layer + thermal insulation layer + leveling layer " forms stable connection, dense filling overall structure.The present application solves the common inverted roof existing due to thermal insulation base uneven or thermal insulation board deformation generates gap and other factors, and the phenomenon of hollowing and cracking of upper leveling layer, plays the role of prolonging inverted roof waterproof layer protection and improves the effect of service life of roof, has broad popularization and application prospect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of inverted roof, and particularly relates to a composite thermal insulation structure of inverted roof, and also relates to a construction method of the composite thermal insulation structure of inverted roof. BACKGROUND

[0002] The inverted roof is also called inverted thermal insulation roof, which is a roof with hydrophobic thermal insulation material arranged on the waterproof layer. The construction levels (from top to bottom) are leveling layer, thermal insulation layer, waterproof layer and structural layer. The inverted roof has special requirements for the thermal insulation material, and the hydrophobic material with low moisture absorption and strong weather resistance should be used as the thermal insulation layer, and the leveling layer is arranged on the thermal insulation layer. Although no exhaust hole is arranged and the structure is simple, the uneven thermal insulation base or the deformation of the thermal insulation plate can easily cause the hollowing and cracking of the leveling layer. At the same time, the hollowing phenomenon between the thermal insulation layer and the waterproof layer can also seriously affect the waterproof effect of the waterproof layer, and finally cause adverse effects on the overall structure safety and service life of the roof.

[0003] Therefore, the inverted roof with a new thermal insulation structure and the construction method thereof are provided to effectively solve the hollowing and cracking of the leveling layer on the conventional inverted roof structure caused by the uneven thermal insulation base or the deformation of the thermal insulation plate, which is of great significance for improving the overall performance of the inverted roof, prolonging the waterproof effect of the waterproof layer and prolonging the service life of the roof, and is also a technical problem to be solved by researchers. SUMMARY

[0004] One of the purposes of the present application is to provide a composite thermal insulation structure of inverted roof, which can effectively solve the hollowing and cracking of the leveling layer on the conventional inverted roof structure caused by the uneven thermal insulation base or the deformation of the thermal insulation plate.

[0005] The second purpose of the present application is to provide a construction method of the composite thermal insulation structure of inverted roof, which can effectively improve the overall performance of the inverted roof, prolong the waterproof effect of the waterproof layer and prolong the service life of the roof.

[0006] The technical solution adopted by the present application to achieve one of the purposes is to provide a composite thermal insulation structure of inverted roof, which comprises a thermal insulation layer, a filling layer and a leveling layer.

[0007] The thermal insulation layer comprises a plurality of thermal insulation plates, and a layer of steel wire mesh is arranged above and below each thermal insulation plate, and a plurality of through holes are formed in the thermal insulation plate and communicated with the steel wire mesh.

[0008] The filling material of the filling layer diffuses to the surface of the waterproof layer through the steel wire mesh, the through holes, the gaps between the thermal insulation boards and the gaps between the thermal insulation boards and the steel wire mesh from top to bottom, and fills the through holes and the gaps, thereby forming the filling layer.

[0009] The leveling layer is arranged above the thermal insulation layer and the filling layer, the filling material of the leveling layer fills the residual gaps between the filling layer, the thermal insulation boards and the steel wire mesh and pours to a specified thickness, thereby realizing the overall leveling of the composite thermal insulation structure.

[0010] In the composite thermal insulation structure of the inverted roof provided by the application, the overall structure of "filling + thermal insulation + leveling" is adopted, and the steel wire mesh arranged above and below the thermal insulation board is used as the basic framework, wherein the lower steel wire mesh plays a role of being suspended between the waterproof layer and the thermal insulation board, and the unevenness of the thermal insulation base layer or the deformation of the thermal insulation board and other factors are eliminated by pouring the filling layer, thereby forming a stable and reliable base structure; the steel wire mesh arranged above the thermal insulation board plays a role of enhancing the overall strength of the leveling layer and preventing cracking. In the composite thermal insulation structure, firstly, the pouring of the filling layer flows into the cavity between the lower surface of the thermal insulation board and the steel wire mesh and the side surface from the channel from top to bottom (including the through holes, the gaps between the thermal insulation boards, the gaps between the thermal insulation boards and the steel wire mesh and the like), and diffuses to the gaps between the waterproof layer surface and the thermal insulation board, until the above-mentioned gaps are filled; then, the pouring of the leveling layer fills the residual gaps between the structures and eliminates the residual gaps on the one hand, and the leveling layer is poured to a certain height and realizes the overall leveling of the structure and enhances the overall strength of the composite thermal insulation structure on the other hand. The above-mentioned composite thermal insulation structure adopts the overall structure design, and can effectively solve the problem that the gaps are formed between the thermal insulation board and the waterproof layer due to the unevenness of the thermal insulation base layer or the deformation of the thermal insulation board in the conventional inverted roof structure, and the leveling layer is prone to hollowing and cracking after construction.

[0011] Further, a plurality of the thermal insulation boards are distributed in the same layer and have gaps therebetween. Preferably, the thermal insulation board is selected from the heat-insulating extruded polyethylene foam board.

[0012] Further, the steel wire mesh has a gap of 10-30 mm with the thermal insulation board, and the steel wire mesh and the thermal insulation board are connected by vertical steel bars. Preferably, one end of the vertical steel bar is connected to the intersection of the longitudinal steel wire and the transverse steel wire in the steel wire mesh, the other end of the vertical steel bar is inserted into the thermal insulation board, and the vertical steel bars used by the upper and lower steel wire meshes are inserted in a staggered manner.

[0013] Further, the steel wire mesh includes a grid structure formed by longitudinal steel wires and transverse steel wires, the internal area of the grid structure is the same as the area of the thermal insulation board, and the ends of the longitudinal steel wires and the transverse steel wires all exceed the edges of the thermal insulation board.

[0014] Preferably, the longitudinal steel wires and the transverse steel wires are made of steel wires with a diameter of 3-5 mm, and the material of the steel wires is preferably Q235 steel.

[0015] Preferably, the distance between the ends of the longitudinal steel wires and the transverse steel wires and the edges of the thermal insulation board is 20-30 mm. Correspondingly, the ends of the steel wires at the edges of the thermal insulation boards in the same layer leave a gap with a width of at least 40-60 mm between each other, which serves as one of the pouring channels of the filling layer.

[0016] In the present application, the thickness of the thermal insulation board can be designed and selected according to the required thermal insulation effect and mechanical strength.

[0017] Further, the thermal insulation board has an area of 0.2-0.4 m 2 An opposite hole is formed, and the diameter of the opposite hole is 60-120 mm. In the present application, the number of the holes in the thermal insulation board not only affects the pouring effect of the pouring of the filling layer, but also directly affects the thermal insulation effect of the composite thermal insulation structure. When the number of the holes is large and the replacement rate is large, the thermal insulation effect of the composite thermal insulation structure is poor. On the contrary, if the number of the holes is small or the holes are not uniformly distributed, the filling effect of the mortar flowing into the board below will be affected, resulting in poor filling. In the present application, by optimizing the number and distribution of the opposite holes formed on the thermal insulation board, the overall strength of the composite thermal insulation structure can be improved, and the thermal insulation effect can be ensured.

[0018] Further, the filling material includes mortar and / or fine stone concrete mixture.

[0019] Preferably, the filling material of the filling layer is mortar, and the filling material of the leveling layer is fine stone concrete mixture. The cement type used for preparing the mortar and the fine stone concrete mixture is the same. In the present application, the filling material of the filling layer is mortar, which has the advantages of fine aggregate and good flowability. The mortar quickly flows through the holes and the opposite holes and fills the gap between the thermal insulation board and the waterproof layer at the bottom, improves the construction efficiency, and has good filling effect. The filling material of the leveling layer is fine stone concrete mixture with the same cement as the filling material of the filling layer, which has the advantage of high strength and can further improve the overall strength of the composite thermal insulation structure and prolong the service life.

[0020] The second purpose of the present application is achieved by the technical scheme of providing a construction method of the composite thermal insulation structure of the inverted roof according to the first purpose of the present application, comprising the following steps:

[0021] The construction of the roof structure layer, the slope adjusting layer and the waterproof layer is performed in sequence, and the composite thermal insulation structure is constructed above the waterproof layer.

[0022] Further, the composite thermal insulation structure constructed above the waterproof layer comprises:

[0023] S1, sequentially laying a lower steel wire mesh, a thermal insulation board and an upper steel wire mesh, and connecting and fixing them;

[0024] S2, filling the filling material through the pairs of perforations of the thermal insulation boards, the gaps between the thermal insulation boards, the gap between the lower surface of the thermal insulation board and the lower steel wire mesh and the side gap, diffusing to the surface of the waterproof layer, and filling each gap to form a filling layer;

[0025] S3, using the filling material to perform secondary filling on the residual gaps between the filling layer, the thermal insulation board and the steel wire mesh and to reach a specified thickness to form a leveling layer;

[0026] S4, after the leveling layer is cured, embedding and filling the separating joints at the connections.

[0027] Preferably, before step S3, the following operation is further included: after the filling layer is filled, checking the filling condition of the lower layer of the thermal insulation board, and using the additional pairs of perforations to perform supplementary filling on the part not completely filled to eliminate the hollowing.

[0028] In the above operation, by using the additional pairs of perforations to perform supplementary filling on the area between the lower layer of the thermal insulation board and the waterproof layer which is not fully filled, it is ensured that the area between the lower layer of the thermal insulation board and the waterproof layer is fully filled with the mortar, the hollowing phenomenon is eliminated, and better composite thermal insulation structure effect is achieved.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] (1) The composite thermal insulation structure of the inverted roof provided by the present application adopts the composite thermal insulation structure of "filling + thermal insulation + leveling", solves the problem that the hollowing and cracking easily occur after the leveling layer is constructed due to the gaps formed between the thermal insulation board and the waterproof layer caused by the unevenness of the thermal insulation base layer or the deformation of the thermal insulation board, and does not affect the overall thermal insulation effect. The composite thermal insulation structure can improve the integrity of the inverted roof, prolong the waterproof layer protection effect and the use effect of the roof, and prolong the service life of the inverted roof.

[0031] (2) The construction method of the composite thermal insulation structure of the inverted roof provided by the present application adopts the layer-by-layer pouring method, first pours the filling material into the air layer between the lower steel wire mesh of the thermal insulation board and the waterproof layer through the pairs of perforations in the thermal insulation board and the reserved gaps between the boards, and then continuously pours the filling material to the leveling layer on the thermal insulation board to a specified thickness. The construction method provided by the present application forms the integrated structure of "filling layer + thermal insulation layer + leveling layer" through two times of pouring. Attached Figure Description

[0032] Figure 1 A cross-sectional schematic diagram of the composite thermal insulation structure of the inverted roof provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the overall structure of the insulation board and wire mesh in the composite insulation structure of the inverted roof provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram illustrating the connection relationship between the insulation board and the wire mesh in the composite insulation structure of the inverted roof provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram illustrating the pouring and forming of the filling layer in the construction method of the inverted roof composite insulation structure provided in this embodiment of the invention.

[0036] Figure 5 A schematic diagram illustrating the pouring of a leveling layer in the construction method of the inverted roof composite insulation structure provided in this embodiment of the invention;

[0037] Among them, 1-insulation layer; 11-insulation board; 12-wire mesh; 13-perforated; 14-vertical reinforcement; 2-filling layer; 3-leveling layer; 4-structural layer; 5-waterproof layer. Detailed Implementation

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0040] Please see Figure 1 and Figure 2 This invention provides a composite thermal insulation structure for an inverted roof, comprising: an insulation layer 1, a filling layer 2, and a leveling layer 3. The insulation layer 1 includes a plurality of insulation boards 11 (the plurality of insulation boards 11 are distributed in the same layer with gaps between them); Figure 2As shown in the structure of the single-piece insulation board), the upper and lower of the insulation board 11 is provided with a layer of steel wire mesh 12, and the insulation board 11 is provided with a plurality of through holes 13 communicating with the upper and lower layers of steel wire mesh 12. The filling material of the filling layer 2 flows from top to bottom through the steel wire mesh 12, the through holes 13, the gaps between the insulation boards 11, the gaps between the insulation boards 11 and the steel wire mesh 12, and the side gaps, diffuses to the surface of the waterproof layer, and fills the through holes 13 and the gaps, forming the filling layer 2. The leveling layer 3 is arranged above the insulation layer 1 and the filling layer 2, and the filling material of the leveling layer 3 fills the residual gaps between the filling layer 2, the insulation board 11 and the steel wire mesh 12 and pours to a specified thickness, realizing the overall leveling of the composite insulation structure.

[0041] Please refer to Figure 2 and Figure 3 , the steel wire mesh 12 and the insulation board 11 are connected by vertical steel bars 14, and a certain gap is left between the upper and lower layers of steel wire mesh 12 and the insulation board 11. Further, the steel wire mesh 12 has a grid structure, the internal area of the grid structure is the same as the area of the insulation board 11, and the ends of the longitudinal steel wires and the transverse steel wires of the grid structure exceed the edges of the insulation board 11.

[0042] A certain number of through holes 13 are uniformly arranged on the insulation board 11 according to the area, and the through holes 13 serve as the main inflow channel of the filling material, which promotes the downward flow and full filling of the filling layer filling material in the lower space gap under the auxiliary action of the remaining structure gaps, ensures the dense filling effect between the insulation layer and the waterproof layer, and improves the overall performance of the inverted roof, the waterproof layer protection effect and the use effect of the roof.

[0043] The application will be further described below in conjunction with specific embodiments, but not as a limitation of the application.

[0044] Example 1

[0045] The embodiment provides a construction method of a composite insulation structure of an inverted roof, comprising the following steps:

[0046] Step 1: Perform the construction of the roof foundation structure: sequentially perform the construction of the structure layer 4, the slope adjusting layer and the waterproof layer 5;

[0047] Step 2: Perform the construction of the composite insulation structure, sequentially lay the lower layer of steel wire mesh 12, the insulation board and the upper layer of steel wire mesh 12, and perform the connection and fixation;

[0048] The length of the insulation board 11 is 1800 mm, and the width is 600 mm; four equidistantly distributed through holes are formed on each insulation board 11, and the diameter of the through hole is 100 mm; the upper and lower steel wire meshes have the same structure, and are both formed by longitudinally and transversely splicing steel wires with a diameter of 4 mm, the steel wire mesh includes 27 square grid units with a side length of 200 mm, the total area of the grid units is the same as the area of the insulation board, the length of the longitudinal steel wire (650 mm) and the transverse steel wire (1850 mm) beyond the grid unit is 25 mm, so that a gap of 50 mm is left between adjacent insulation boards. A gap of 20 mm is left between the upper and lower steel wire meshes 12 and the insulation board 11 in the vertical direction.

[0049] Step 3: The mortar (the mass ratio of cement to sand is 1:2) flows into the gap between the lower surface of the insulation board 11 and the lower steel wire mesh 12 and the side gap through the through hole 13 of the insulation board 11 and the gap between the insulation boards 11, spreads to the surface of the waterproof layer 5, and fills each gap to form the filling layer 2; after the filling layer 2 is filled, the filling condition of the lower insulation board 11 is checked, and the part not completely filled is supplemented and filled by additionally forming a through hole (the size of the through hole is equivalent to the hollow area) to eliminate the hollow (the structure after the first pouring is as shown in Figure 4 ).

[0050] Step 4: The residual gap between the filling layer 2, the insulation board 11 and the steel wire mesh 12 is secondarily filled with C20 fine stone concrete mixture (the cement type used for the mortar is the same as that used for the cement) to a specified thickness to form the leveling layer 3 (the structure after the second pouring is as shown in Figure 5 ).

[0051] Step 5: After the leveling layer 3 is cured, the separation joints at the connections are embedded and filled.

[0052] Example 2

[0053] The embodiment provides a construction method of a composite insulation structure of an inverted roof, and the method comprises the following steps:

[0054] Step 1: constructing a roof foundation structure: sequentially constructing the structure layer 4, the slope adjusting layer and the waterproof layer 5;

[0055] Step 2: constructing the composite insulation structure, sequentially laying the lower steel wire mesh 12, the insulation board and the upper steel wire mesh 12, and connecting and fixing them;

[0056] The length of the insulation board 11 is 1500 mm, and the width is 450 mm; three equidistantly distributed through holes are formed on each insulation board 11, and the diameter of the through hole is 60 mm; the upper and lower steel wire meshes have the same structure, and are both formed by longitudinally and transversely splicing steel wires with a diameter of 3 mm, the steel wire mesh includes 30 square grid units with a side length of 150 mm, the total area of the grid units is the same as the area of the insulation board, and the length of the end of the longitudinal steel wire (490 mm) and the transverse steel wire (1540 mm) exceeding the grid unit is 20 mm, so that a gap of 40 mm is left between adjacent insulation boards. A gap of 15 mm is left between the upper and lower steel wire meshes 12 and the insulation board 11 in the vertical direction.

[0057] Step 3: The mortar (the mass ratio of cement to sand is 1:2) flows into the gap between the lower surface of the insulation board 11 and the lower steel wire mesh 12 and the side gap through the through hole 13 of the insulation board 11 and the gap between the insulation boards 11, spreads to the surface of the waterproof layer 5, and fills each gap to form the filling layer 2; after the filling layer 2 is filled, the filling of the lower insulation board 11 is checked, and the part that is not completely filled is supplemented and filled by additionally forming a through hole 13 (the size of the through hole is equivalent to the hollow area) to eliminate the hollow (the structure after the first pouring is as shown in Figure 4 ).

[0058] Step 4: The residual gap between the filling layer 2, the insulation board 11 and the steel wire mesh 12 is filled again with C20 fine stone concrete mixture (the cement type used for the mortar is the same as that used for the mortar), and the specified thickness is reached to form the leveling layer 3 (the structure after the second pouring is as shown in Figure 5 ).

[0059] Step 5: After the leveling layer 3 is cured, the separation joints at the connections are filled.

[0060] Example 3

[0061] The embodiment provides a construction method of a composite insulation structure of an inverted roof, and the method comprises the following steps:

[0062] Step 1: Construction of the roof foundation structure: sequentially constructing the structural layer 4, the slope adjusting layer and the waterproof layer 5;

[0063] Step 2: Construction of the composite insulation structure, sequentially laying the lower steel wire mesh 12, the insulation board and the upper steel wire mesh 12, and connecting and fixing them;

[0064] The length of the insulation board 11 is 2000 mm, and the width is 1000 mm; 6 equidistantly distributed through holes are arranged on each insulation board 11, and the diameter of the through hole is 120 mm; the upper and lower steel wire meshes have the same structure, and are both formed by longitudinally and transversely splicing steel wires with a diameter of 5 mm, the steel wire mesh includes 32 square grid units with a side length of 250 mm, the total area of the grid units is the same as the area of the insulation board, and the length of the end of the longitudinal steel wire (1060 mm) and the transverse steel wire (2060 mm) exceeding the grid unit is 30 mm, so that a gap of about 60 mm is left between adjacent insulation boards. A gap of 25 mm is left between the upper and lower steel wire meshes 12 and the insulation board 11 in the vertical direction.

[0065] Step 3: The mortar (the mass ratio of cement to sand is 1:2) flows into the gap between the lower surface of the insulation board 11 and the lower steel wire mesh 12 and the side gap through the through hole 13 of the insulation board 11 and the gap between the insulation boards 11, spreads to the surface of the waterproof layer 5, and fills each gap to form the filling layer 2; after the filling layer 2 is filled, the filling condition of the lower insulation board 11 is checked, and the part not completely filled is supplemented and filled by additionally arranging the through hole 13 (the size of the through hole is equivalent to the hollow area) to eliminate the hollow (the structure after the first pouring is as shown in Figure 4 ).

[0066] Step 4: The residual gap between the filling layer 2, the insulation board 11 and the steel wire mesh 12 is secondarily filled with C20 fine stone concrete mixture (the cement type used in the mortar is the same as that used in the cement) to a specified thickness to form the leveling layer 3 (the structure after the second pouring is as shown in Figure 5 ).

[0067] Step 5: After the leveling layer 3 is cured, the separation joints at the connection are embedded and filled.

[0068] The inverted roof with the composite insulation structure built by each of the above embodiments has been applied in practice for more than five years, and the leveling layer does not have the conditions such as hollow, crack and cracking, and the insulation function and the waterproof function are both kept intact.

[0069] The above are only the preferred embodiments of the present application, and do not limit the implementation manners and the protection scope of the present application. It should be understood by those skilled in the art that any equivalent replacement and obvious change made by using the content of the present application should be included in the protection scope of the present application.

Claims

1. A composite thermal insulation structure for an inverted roof, characterized in that, The composite insulation structure includes: an insulation layer (1), a filling layer (2), and a leveling layer (3); The insulation layer (1) includes several insulation boards (11), and a layer of wire mesh (12) is provided on the top and bottom of the insulation board (11). The wire mesh (12) and the insulation board (11) are connected by vertical steel bars (14), and a gap of 10~30mm is left between the wire mesh (12) and the insulation board (11). The insulation board (11) has several through holes (13) connecting the upper and lower layers of wire mesh (12); the insulation board (11) has holes every 0.2~0.4m. 2 A through hole (13) is made, the diameter of which is 60~120mm; The filling material of the filling layer (2) spreads from top to bottom through the wire mesh (12), the perforations (13), the gaps between each insulation board (11), and the gaps between the insulation board (11) and the wire mesh (12) to the surface of the waterproof layer, and fills the perforations (13) and each gap to form the filling layer (2). The leveling layer (3) is set above the insulation layer (1) and the filling layer (2). The filling material of the leveling layer (3) fills the residual gaps between the filling layer (2), the insulation board (11) and the wire mesh (12) and pours it to the specified thickness to achieve the overall leveling of the composite insulation structure.

2. The composite thermal insulation structure for the inverted roof according to claim 1, characterized in that, Several of the insulation boards (11) are distributed in the same layer with gaps between them.

3. The composite thermal insulation structure for the inverted roof according to claim 1, characterized in that, The wire mesh (12) includes a grid structure formed by longitudinal and transverse wires, the internal area of ​​which is the same as the area of ​​the insulation board (11); the ends of the longitudinal and transverse wires extend beyond the edge of the insulation board (11).

4. The composite thermal insulation structure for the inverted roof according to claim 1, characterized in that, The filling material includes mortar and / or fine aggregate concrete mixture.

5. The composite thermal insulation structure for an inverted roof according to claim 4, characterized in that, The filling material of the filling layer (2) is mortar; the filling material of the leveling layer (3) is fine stone concrete mixture; the cement used to prepare the mortar and the fine stone concrete mixture is the same type.

6. A construction method for a composite thermal insulation structure of an inverted roof according to any one of claims 1-5, characterized in that, Includes the following steps: The roof structure layer (4), the slope adjustment layer and the waterproof layer (5) are constructed in sequence; the composite insulation structure is constructed above the waterproof layer (5).

7. The construction method according to claim 6, characterized in that, The construction of the composite insulation structure above the waterproof layer (5) includes: S1. Lay the lower layer of wire mesh, insulation board (11) and upper layer of wire mesh in sequence, and connect and fix them. S2. The filling material is passed through the through holes (13) of the insulation board (11) and the gaps between each insulation board (11), flows into the gaps between the lower surface of the insulation board (11) and the lower layer of wire mesh (12) and the side gaps, diffuses to the surface of the waterproof layer (5), and fills each gap to form a filling layer (2). S3. Use filling material to fill the remaining gaps between the filling layer (2), insulation board (11) and wire mesh (12) a second time and pour it to reach the specified thickness to form a leveling layer (3). S4. After the leveling layer (3) has been cured, the joints at each connection point should be filled.

8. The construction method according to claim 7, characterized in that, Before step S3, the following operations are also included: after the filling layer (2) is filled, the filling condition of the lower layer of the insulation board (11) is checked, and the part that is not completely filled is filled by making additional through holes (13) to eliminate the voids.

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