Construction method of ground thermal insulation waterproof structure for passive building

Abstract

The invention relates to the technical field of passive building construction, in particular to a construction method of a ground heat-preservation waterproof structure for a passive building, which comprises the following steps: excavating a ground beam ditch and tamping a plain soil layer; laying a first GRC cement board layer, a first extruded sheet thermal insulation layer and a waterproof roll layer in layers; a second GRC cement board layer and a second extruded sheet heat preservation layer are additionally arranged at the bottom of the ground beam ditch, and after a ground beam body is poured, construction of a concrete protection layer, a bonding layer and a floor tile surface layer is completed in sequence; wherein the joints of the GRC plates are treated by waterproof sealants, the joints of the extruded plates are sealed by special adhesive tapes, and the waterproof coiled materials and the GRC plates are bonded in a full-width mode through a full bonding method; by optimizing the material combination and the construction process, the heat preservation and waterproof defects of a traditional ground structure are overcome, and the structure has the advantages of being high in heat bridge blocking performance, high in waterproof durability and outstanding in construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of passive building construction, in particular to a construction method of a ground thermal insulation and waterproof structure for a passive building. Background Art

[0002] In traditional passive building ground construction, insulation and waterproofing layers are typically laid separately, leading to problems such as lax joint treatment, significant thermal bridging, and weak adhesion between the waterproofing layer and the base layer. This reduces energy efficiency and increases the risk of leakage. Existing technologies lack a systematic approach to the coordinated construction of extruded boards and waterproofing membranes, making the waterproofing and insulation structure in the trenches prone to cracking due to stress concentration. Therefore, a ground construction method that integrates insulation, waterproofing, and structural stability is urgently needed to address these technical shortcomings. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a construction method for a ground insulation and waterproof structure for passive buildings that integrates insulation, waterproofing and structural stability.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A construction method for a ground thermal insulation and waterproof structure for a passive building comprises the following steps: S1: Excavate the ground beam trench and mechanically compact the soil layer of the ground and the ground beam trench; S2: Lay the first GRC cement slab layer on the ground and the plain soil layer in the beam trench; S3: Laying the first extruded board insulation layer on the first GRC cement board layer on the ground; S4: Lay a waterproof membrane layer on the first extruded board insulation layer on the ground and the first GRC cement board layer in the ground beam trench; S5: Lay the second GRC cement board layer on the waterproof membrane layer at the bottom of the beam trench; S6: Lay the second extruded board insulation layer in the ground beam trench. The second extruded board insulation layer is located on the upper side of the waterproof membrane layer and the second GRC cement board layer; S7: pouring the main body of the ground beam on the second extruded board insulation layer in the ground beam trench; S8: Lay the concrete protective layer, plain cement slurry bonding layer, dry hard cement mortar bonding layer and floor tile surface layer on the waterproof membrane layer on the ground, the second extruded board insulation layer in the ground beam trench and the ground beam in sequence.

[0005] Preferably, a further technical solution of the present invention is: Preferably, in step S5, the width of the second GRC cement board layer is the same as the preset ground beam width, and the laying position is located below the preset ground beam casting position.

[0006] Preferably, the thickness of the first GRC cement board layer and the second GRC cement board layer are both 20-25 mm.

[0007] Preferably, the waterproof membrane layer adopts SBS self-adhesive waterproof membrane or polymer modified asphalt waterproof membrane with a thickness greater than or equal to 4 mm. Adjacent waterproof membranes are overlapped up and down with an overlap width greater than or equal to 100 mm.

[0008] Preferably, the thickness of the first extruded board insulation layer and the second extruded board insulation layer are both 100-160 mm, and the joints are sealed with a special sealing tape for extruded boards.

[0009] Preferably, the thickness of the concrete protective layer is 40 mm.

[0010] Preferably, the thickness of the dry hard cement mortar bonding layer is 20-30 mm, and the volume ratio of cement to sand during mixing is 1:3.

[0011] Preferably, the thickness of the floor tile surface layer is 10 mm.

[0012] Preferably, the first GRC cement board layer and the second GRC cement board layer are both laid with staggered seams, and the seams are filled with waterproof sealant.

[0013] Preferably, the waterproof membrane layer and the first GRC cement board layer and the second GRC cement board layer are constructed using a full-bonding method. Specifically, after applying a special adhesive on the surface of the first GRC cement board layer, the waterproof membrane is laid and compacted over the entire width to ensure that there are no hollows. Then, after applying a special adhesive on the lower surface of the second GRC cement board layer, the second GRC cement board layer is laid on the waterproof membrane layer and compacted.

[0014] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: The present invention achieves efficient coordination of ground insulation, waterproofing and structural stability through a layered composite construction process; the staggered laying and sealing of the GRC cement board layer and the extruded board insulation layer can effectively block thermal bridges and improve the energy-saving performance of passive buildings; the full-bonding method is used to lay the waterproof membrane to eliminate the hidden dangers of hollowing and leakage; and the compression resistance of the ground beam is enhanced by layering two GRC cement board layers in the ground beam trench. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the layered structure of the ground thermal insulation and waterproof structure in an embodiment of the present invention.

[0016] Explanation of the accompanying symbols: 1. Plain soil layer; 2. First GRC cement board layer; 3. First extruded board insulation layer; 4. Waterproof membrane layer; 5. Second GRC cement board layer; 6. Second extruded board insulation layer; 7. Ground beam body; 8. Concrete protective layer; 9. Plain cement slurry bonding layer; 10. Dry hard cement mortar bonding layer; 11. Floor tile surface layer. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with specific embodiments. The purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0018] like Figure 1 As shown, this embodiment provides a construction method for a ground insulation and waterproof structure for a passive building, comprising the following steps: S1: Excavate the ground beam trench and mechanically compact the soil layer 1 on the ground and in the ground beam trench. The compaction coefficient of the compacted soil layer 1 should be ≥ 0.95. Use a heavy roller for mechanical compaction, rolling the soil 1 at least 6 times. After compaction, check and remove sharp debris to prevent puncture of the subsequent waterproofing layer.

[0019] S2: Lay the first GRC cement board layer 2 on the ground and the plain soil layer 1 in the ground beam trench. When laying, the joints of adjacent boards should be staggered by ≥300mm to avoid through seams. The joints should be treated with waterproof sealant, and the waterproof sealant should be polyurethane or silicone sealant.

[0020] S3: Laying the first extruded board insulation layer 3 on the first GRC cement board layer 2 on the ground.

[0021] S4: Lay a waterproof membrane layer 4 on the first extruded board insulation layer 3 on the ground and the first GRC cement board layer 2 in the ground beam trench; wherein the waterproof membrane layer 4 uses SBS self-adhesive waterproof membrane or polymer modified asphalt waterproof membrane with a thickness greater than or equal to 4mm. Adjacent waterproof membranes are overlapped with each other, and the overlap width is greater than or equal to 100mm. The overlapped parts need to be additionally coated with SBS modified asphalt adhesive, and a hot air welding gun is used to assist in bonding.

[0022] When laying the waterproof membrane layer 4, the waterproof membrane layer 4 and the first GRC cement board layer 2 and the second GRC cement board layer 5 are constructed using the full bonding method. Specifically, after applying a special adhesive on the surface of the first GRC cement board layer 2, the waterproof membrane is laid and compacted over the entire width to ensure that there are no hollows. Then, after applying a special adhesive on the lower surface of the second GRC cement board layer 5, the second GRC cement board layer 5 is laid on the waterproof membrane layer 4 and compacted. Specifically, the special adhesive is SBS modified asphalt adhesive.

[0023] S5: Laying a second GRC cement board layer 5 on the waterproof membrane layer 4 at the bottom of the ground beam trench; wherein the width of the second GRC cement board layer 5 is the same as the preset ground beam width, and the laying position is located below the preset ground beam casting position.

[0024] It should be noted that, in this embodiment, the thickness of the first GRC cement board layer 2 and the second GRC cement board layer 5 are both 20-25 mm, and the first GRC cement board layer 2 and the second GRC cement board layer 5 are both laid in a staggered arrangement, and the joints are filled with waterproof sealant.

[0025] S6: Lay a second extruded board insulation layer 6 in the ground beam trench. The second extruded board insulation layer 6 is located on the upper side of the waterproof membrane layer 4 and the second GRC cement board layer 5 .

[0026] In this embodiment, the thickness of the first extruded board insulation layer 3 and the second extruded board insulation layer 6 are both 100-160 mm. The joints are sealed with a special sealing tape for extruded boards. The special sealing tape is an aluminum foil butyl tape with a width of ≥ 50 mm and a tensile strength of ≥ 0.5 MPa. When laying the extruded boards, the long side should be laid perpendicular to the direction of the ground beam trench to reduce stress concentration at the joints.

[0027] S7: pour the ground beam body 7 on the second extruded board insulation layer 6 in the ground beam trench; after pouring, cover with plastic film to keep moist and maintain for ≥ 7 days to avoid cracking.

[0028] S8: Lay a concrete protective layer 8, a plain cement mortar bonding layer 9, a hard-setting cement mortar bonding layer 10, and a floor tile surface layer 11 in sequence over the ground waterproof membrane layer 4, the second extruded board insulation layer 6 in the ground beam trench, and the ground beam body 7. The concrete protective layer 8 is 40 mm thick; the hard-setting cement mortar bonding layer 10 is 20-30 mm thick, with a cement-to-sand volume ratio of 1:3; and the floor tile surface layer 11 is 10 mm thick.

[0029] The present invention achieves the coordinated optimization of thermal insulation, waterproofing and bearing performance of passive building ground structures through an innovative layered composite construction process, and has the following significant beneficial effects: 1. The composite structure of GRC cement board layer and extruded board insulation layer is adopted, combined with staggered laying and sealing treatment, to effectively block the thermal bridge effect, reduce the ground heat transfer coefficient to below 0.12W / (m²·K), and significantly improve the energy-saving efficiency of the building; 2. The full-bonding construction process and the application of special adhesives ensure that the waterproof membrane is firmly bonded to the base layer; 3. The innovative sandwich structure of double-layer GRC cement board and extruded board is adopted in the ground beam ditch area to improve the compressive strength of the ground beam area, effectively solving the problem of easy cracking at the root of the traditional ground beam body 7; 4. By setting standardized construction parameters (such as a 1:3 volume ratio of dry and hard mortar, 50mm tape sealing of extruded board joints, etc.), the construction efficiency is improved by 40%, while ensuring quality consistency and reducing performance fluctuations caused by manual errors.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made by using the contents of the present invention description and the drawings are included in the scope of the present invention.

Claims

1. A construction method for a ground insulation and waterproof structure for a passive building, characterized in that: The steps include: S1: excavate the ground beam trench and mechanically compact the soil layer (1) on the ground and the ground beam trench; S2: Laying the first GRC cement board layer (2) on the ground and the plain soil layer (1) in the ground beam trench; S3: Laying a first extruded board insulation layer (3) on the first GRC cement board layer (2) on the ground; S4: Laying a waterproof membrane layer (4) on the first extruded board insulation layer (3) on the ground and the first GRC cement board layer (2) in the ground beam trench; S5: Lay the second GRC cement board layer (5) on the waterproof membrane layer (4) at the bottom of the beam trench; S6: Laying a second extruded board insulation layer (6) in the ground beam trench, wherein the second extruded board insulation layer (6) is located on the upper side of the waterproof membrane layer (4) and the second GRC cement board layer (5); S7: pouring the ground beam body (7) on the second extruded board insulation layer (6) in the ground beam trench; S8: A concrete protective layer (8), a plain cement slurry bonding layer (9), a dry hard cement mortar bonding layer (10) and a floor tile surface layer (11) are sequentially laid on the waterproof membrane layer (4) on the ground, the second extruded board insulation layer (6) in the ground beam trench and the ground beam body (7).

2. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: In step S5, the width of the second GRC cement board layer (5) is the same as the preset ground beam width, and the laying position is located below the preset ground beam casting position.

3. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The thickness of the first GRC cement board layer (2) and the second GRC cement board layer (5) are both 20-25 mm.

4. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The waterproofing membrane layer (4) adopts SBS self-adhesive waterproofing membrane or polymer modified asphalt waterproofing membrane with a thickness greater than or equal to 4 mm. Adjacent waterproofing membranes are overlapped up and down with an overlap width greater than or equal to 100 mm.

5. The ground thermal insulation and waterproof structure for passive buildings according to claim 1, characterized in that: The thickness of the first extruded board insulation layer (3) and the second extruded board insulation layer (6) are both 100-160 mm, and the joints are sealed with a special sealing tape for extruded boards.

6. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The thickness of the concrete protective layer (8) is 40 mm.

7. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The thickness of the dry hard cement mortar bonding layer (10) is 20-30 mm, and the volume ratio of cement to sand is 1:

3.

8. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The thickness of the floor tile surface layer (11) is 10 mm.

9. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The first GRC cement board layer (2) and the second GRC cement board layer (5) are both laid in a staggered arrangement, and the joints are filled with waterproof sealant.

10. The construction method of a ground thermal insulation and waterproof structure for a passive building according to claim 1, characterized in that: The waterproofing membrane layer (4) and the first GRC cement board layer (2) and the second GRC cement board layer (5) are constructed by a full-bonding method. Specifically, after applying a special adhesive on the surface of the first GRC cement board layer (2), the waterproofing membrane is laid and compacted over the entire width to ensure that there are no hollows. Then, after applying a special adhesive on the lower surface of the second GRC cement board layer (5), the second GRC cement board layer (5) is laid on the waterproofing membrane layer (4) and compacted.

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