Roof waterproofing repair system based on material compatibility and construction method

Abstract

The application discloses a roofing waterproof repair system based on material compatibility and a construction method, belongs to the technical field of building waterproof repair, and comprises the following composite structure: a base treatment layer, V-shaped grooves are formed at roof cracks, a plugging layer is filled in the V-shaped grooves, and the plugging layer is a modified polyurethane sealant; an elastic waterproof coating layer, 3-4 mm thick high-elastic polyurethane waterproof paint is brushed on the surface of the base treatment layer; and a coiled material protection layer, a compatible layer is fully adhered after the elastic waterproof coating layer is dried, the compatible layer comprises 3 mm thick SBS modified asphalt waterproof coiled material, and the SBS modified asphalt waterproof coiled material and the high-elastic polyurethane waterproof paint are chemically crosslinked to form an integral waterproof layer. The roofing waterproof repair system based on material compatibility and the construction method are adopted, waterproof performance and anti-base cracking capability are improved, waterproof life is prolonged, material cost is saved, maintenance frequency is reduced, comprehensive cost is lowered, and various substrates can be adapted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building waterproof repair, in particular to a roofing waterproof repair system based on material compatibility and a construction method. BACKGROUND

[0002] In the prior art, the old roof leakage treatment generally adopts a single-point repair mode of "repairing leaks as they occur", without systematically treating the crack network and base deformation problems, resulting in a leakage recurrence rate of up to 60%-80%. In traditional waterproofing technology, polyurethane coating and SBS membrane have poor chemical compatibility, with a peel strength of only 3-5 N / 10 mm, are prone to delamination and fall off, have a waterproof service life of only 5-8 years, and have high costs of full-paving membrane, with a material waste rate of 15%-20%. In the prior art, using a single material for repair (such as only applying waterproof coating) cannot adapt to base cracking, is prone to tearing when the crack width is greater than or equal to 0.3 mm, does not accurately locate the leakage source during repair, and blindly slots repair, resulting in a construction period extended by more than 30%, and damaging the original structure. SUMMARY

[0003] The present application aims to provide a roofing waterproof repair system based on material compatibility and a construction method, to improve waterproof performance and base cracking resistance, and to prolong the waterproof service life; to save material costs, reduce maintenance frequency, and reduce comprehensive costs; and to be adaptable to various substrates.

[0004] To achieve the above-mentioned purpose, the present application provides a roofing waterproof repair system based on material compatibility, comprising the following composite structure:

[0005] A base treatment layer: a V-shaped groove is formed at the roof crack, and a sealing layer is filled in the V-shaped groove, the sealing layer being a modified polyurethane sealant;

[0006] An elastic waterproof coating layer: a 3-4 mm thick high-elastic polyurethane waterproof coating is applied on the surface of the base treatment layer;

[0007] A membrane protection layer: after the elastic waterproof coating layer is dried, a compatible layer is fully adhered, the compatible layer comprising a 3 mm thick SBS modified asphalt waterproof membrane, and the SBS modified asphalt waterproof membrane and the high-elastic polyurethane waterproof coating are chemically cross-linked to form an integral waterproof layer.

[0008] Preferably, the tensile strength of the high-elastic polyurethane waterproof coating is greater than or equal to 2.0 MPa, the elongation at break is greater than or equal to 500%, the peel strength of the SBS modified asphalt waterproof membrane and the high-elastic polyurethane waterproof coating is greater than or equal to 8 N / 10 mm, and the lap width of the membrane is greater than or equal to 100 mm, which are welded by a hot melting method, with a welding temperature controlled at 200-250 DEG C.

[0009] Preferably, the V-shaped groove is cut by a diamond cutting blade, the depth of the V-shaped groove is 3-5mm, the width is 5-7mm, the roughness Ra of the groove wall is greater than or equal to 25, the groove is cleaned and then sprayed with an interface treatment agent, the bonding strength is greater than or equal to 1.0MPa, the elongation of the modified polyurethane sealant is greater than or equal to 500%, and the bonding strength between the modified polyurethane sealant and the concrete base is greater than or equal to 0.5MPa.

[0010] Preferably, the SBS modified asphalt waterproof coiled material adopts a type II polyester base, the heat resistance is greater than or equal to 105 DEG C, and the low-temperature flexibility is crack-free at-25 DEG C.

[0011] The application provides a construction method of a roofing waterproof repair system based on material compatibility, and comprises the following steps:

[0012] S1, leakage detection and positioning: an infrared thermal imager is used to scan the roof, and a geological radar is used to detect the crack depth and direction, and the leakage area to be treated is marked;

[0013] S2, crack grooving and filling: a V-shaped groove is formed in the marked area, and the modified polyurethane sealant is filled in the groove after the groove is cleaned, and then compacted to be flush with the base;

[0014] S3, waterproof coating construction: after the sealant is cured for 24 hours, high-elasticity polyurethane waterproof coating is applied in two passes, the thickness of the first pass is 1.5-2mm, the thickness of the second pass is 1-1.5mm, the brushing direction is perpendicular, and the interval time is 12-24 hours;

[0015] S4, full adhesion of waterproof coiled material: after the coating is dried for 48 hours, the SBS coiled material is hot-melted and adhered according to the reference line, the coiled material lap joint is formed by a double-welding seam process, the welding gun temperature is controlled to be 220-240 DEG C, and bubbles are removed by compaction;

[0016] S5, closed water test: the closed water test is performed for 48 hours after the construction is completed for 72 hours, the water level height is greater than or equal to 50mm, and the leakage rate is less than or equal to 5%.

[0017] Preferably, the detection environment temperature of the infrared thermal imager is 15-25 DEG C, the roof is dried for 48 hours before detection, and the radar scanning frequency is 100-200MHz.

[0018] Therefore, the roofing waterproof repair system and the construction method based on material compatibility have the following beneficial effects:

[0019] (1) waterproof performance: the high-elasticity polyurethane coating and the SBS coiled material form an integrated waterproof layer through chemical cross-linking, avoid delamination, reduce the leakage rate in the closed water test, the V-shaped groove is filled with the modified polyurethane sealant, the high elongation of the modified polyurethane sealant is used to adapt to the micro-deformation of the base, the bonding strength is greater than or equal to 0.5MPa to ensure long-term anchoring, the anti-base cracking ability is improved, and the waterproof life is prolonged;

[0020] (2) Economic benefits: infrared thermal imager + geological radar combined positioning leakage point and crack depth, reducing the trenching area by 30%-50%, saving material cost by 20%, reducing maintenance frequency by 70%, and reducing comprehensive cost by 40%;

[0021] (3) Practicality: can adapt to various substrates, especially for special-shaped roofs.

[0022] The technical solutions of the present application will be further described in detail below by means of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the construction of the roofing waterproof repair system based on material compatibility of the present application;

[0024] Figure 2 is a schematic diagram of the construction of the roofing waterproof repair system based on material compatibility of the present application;

[0025] Figure 3 is a schematic diagram of the construction of the roofing waterproof repair system based on material compatibility of the present application;

[0026] REFERENCE NUMERALS

[0027] 1, concrete base; 2, V-shaped groove; 3, modified polyurethane sealant; 4, high-elastic polyurethane waterproof coating; 5, SBS modified asphalt waterproof roll material; 6, hot melt welding seam; 7, crack. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be further described in detail below by means of the accompanying drawings and examples.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present application shall be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Example 1

[0031] As Figure 1 and Figure 2As shown, the present invention provides a roof waterproofing repair system based on material compatibility, comprising the following composite structure:

[0032] Base treatment layer: A V-shaped groove 2 is opened at the crack 7 in the roof. The depth of the V-shaped groove 2 is 3-5mm and the width is 5-7mm. The V-shaped groove 2 is filled with a sealing layer, which is a modified polyurethane sealant 3. The modified polyurethane sealant 3 is a polyether-type polyurethane sealant, which is a conventional sealing material in this field and can be purchased through commercial channels. The elongation of the modified polyurethane sealant 3 is ≥500%, and the bond strength between the modified polyurethane sealant 3 and the concrete base layer 1 is ≥0.5MPa.

[0033] V-groove 2 is cut with a diamond cutting disc, and the groove wall roughness Ra≥25. After cleaning the floating dust with high-pressure air, a water-based epoxy resin interface treatment agent is sprayed on, and the bonding strength is ≥1.0MPa.

[0034] Elastic waterproof coating: Apply two coats of high-elastic polyurethane waterproof coating 4 to the surface of the base treatment layer, with a total thickness of 3-4mm. The coating tensile strength is ≥2.0MPa and the elongation at break is ≥500%. Use reinforcing material (polyester fabric) to make an additional layer at the inside and outside corners.

[0035] Roll protective layer: After the elastic waterproof coating dries, a compatibility layer is fully bonded. The compatibility layer includes a 3mm thick SBS modified bitumen waterproof membrane 5. The SBS modified bitumen waterproof membrane 5 and the high-elastic polyurethane waterproof coating 4 are chemically cross-linked to form an integral waterproof layer.

[0036] The peel strength between the SBS modified bitumen waterproof membrane and the high-elastic polyurethane waterproof coating is ≥8N / 10mm, the overlap width of the membrane is ≥100mm, and a hot-melt weld is formed by hot-melt welding 6, with the welding temperature controlled at 200-250℃. The SBS modified bitumen waterproof membrane 5 uses a type II polyester base, with a heat resistance ≥105℃ and low-temperature flexibility -25℃ without cracking.

[0037] like Figure 3 As shown, this invention provides a construction method for a material compatibility-based roof waterproofing repair system, including the following steps:

[0038] S1. Leakage detection and location: The roof is scanned with an infrared thermal imager (accuracy ±0.5℃) and ground-penetrating radar (resolution 10mm) is used to detect the depth and direction of crack 7 and mark the leakage areas that need to be treated.

[0039] The infrared thermal imager is used to detect ambient temperatures of 15-25℃, and the roof must be dry for 48 hours before detection. The radar scanning frequency is 100-200MHz.

[0040] S2, crack grooving and filling: V-shaped grooves 2 are formed in the marked area, and after cleaning the impurities in the grooves, modified polyurethane sealant 3 is filled and compacted to be flush with the base layer;

[0041] S3, waterproof coating construction: after the modified polyurethane sealant 3 is cured for 24 hours, high-elastic polyurethane waterproof coating 4 is applied in two passes, the first pass has a thickness of 1.5-2mm, and the second pass has a thickness of 1-1.5mm, the brushing direction is perpendicular, and the interval time is 12-24 hours;

[0042] S4, full adhesion of waterproof coiled material: after the coating is dried for 48 hours, SBS modified asphalt waterproof coiled material 5 is hot-melted and adhered according to the reference line of the wire, the lap joint of the SBS modified asphalt waterproof coiled material 5 uses a double-welding seam process, the welding gun temperature is controlled at 220-240℃, and bubbles are removed by compaction;

[0043] S5, closed water test: after 72 hours of construction, a 48-hour closed water test is performed, the water level height is greater than or equal to 50mm, and the leakage rate is less than or equal to 5%.

[0044] Example two

[0045] The concrete roof (area 2000m 2 ) of an old community has 32 leakage points and the crack width is 0.2-0.8mm.

[0046] Infrared thermal imaging instrument detection found 28 heat source abnormal areas, radar scanning determined that 15 of them had through cracks. V-shaped grooves 2 are formed in the through crack area, the groove depth is 4mm, the width is 6mm, modified polyurethane sealant 3 is filled, non-through cracks are directly coated, high-elastic polyurethane waterproof coating 4 with a tensile strength of 2.5MPa is selected and applied in two passes, the total thickness is 3.5mm, and the matrix reinforcing material (polyester cloth) is additionally layered at the inside and outside corners. After the high-elastic polyurethane waterproof coating 4 is applied, the SBS modified asphalt waterproof coiled material 5 is full-adhered, and the total construction period is 12 days (8 days shorter than the traditional process).

[0047] The detection results are as follows: there is no leakage point in the closed water test, the adhesion strength of the high-elastic polyurethane waterproof coating 4 and the concrete base layer 1 is 0.8MPa in the pull-out test, and the peeling strength of the SBS modified asphalt waterproof coiled material 5 and the high-elastic polyurethane waterproof coating 4 is 9.2N / 10mm, which meets the requirements of “Roofing Engineering Technical Specification” (GB50345).

[0048] Therefore, the roofing waterproof repair system and construction method based on material compatibility improve the waterproof performance and anti-base cracking ability, prolong the waterproof life, save material cost, reduce the maintenance frequency, and reduce the comprehensive cost.

[0049] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can still be modified or replaced equivalently, and these modifications or equivalent replacements should not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A material compatibility based waterproofing repair system for roofing characterized in that: The composite structure comprises the following: A base treatment layer: V-shaped grooves are formed at the roof cracks, and a sealing layer is filled in the V-shaped grooves, wherein the sealing layer is a modified polyurethane sealant; An elastic waterproof coating layer: a 3-4 mm thick high-elastic polyurethane waterproof coating is brushed on the surface of the base treatment layer; The tensile strength of the high-elastic polyurethane waterproof coating is greater than or equal to 2.0 MPa, the elongation at break is greater than or equal to 500%, the peeling strength between the SBS modified bitumen waterproof roll and the high-elastic polyurethane waterproof coating is greater than or equal to 8 N / 10 mm, the lap width of the roll is greater than or equal to 100 mm, the roll is welded by using a hot melting method, and the welding temperature is controlled to be 200-250 DEG C; A roll protection layer: after the elastic waterproof coating layer is dried, a compatible layer is fully adhered, wherein the compatible layer comprises a 3 mm thick SBS modified bitumen waterproof roll, and the SBS modified bitumen waterproof roll and the high-elastic polyurethane waterproof coating are chemically crosslinked to form an integrated waterproof layer; The SBS modified bitumen waterproof roll adopts a type II polyester base, the heat resistance is greater than or equal to 105 DEG C, and the low-temperature flexibility is free of cracks at-25 DEG C; The construction method of the above-mentioned roof waterproof repair system based on material compatibility comprises the following steps: S1, leakage detection and positioning: the roof is scanned by using an infrared thermal imager, the crack depth and direction are detected by using a geological radar, and the leakage area to be treated is marked; S2, crack grooving and filling: V-shaped grooves are formed in the marked area, and the modified polyurethane sealant is filled in the grooves after the grooves are cleaned of sundries and is compacted to be flush with the base; S3, waterproof coating construction: after the sealant is cured for 24 hours, the high-elastic polyurethane waterproof coating is brushed in two passes, the first pass has a thickness of 1.5-2 mm, the second pass has a thickness of 1-1.5 mm, the brushing direction is perpendicular, and the interval time is 12-24 hours; S4, waterproof roll full adhesion: after the coating is dried for 48 hours, the SBS roll is hot-melted and fully adhered according to the reference line, the roll lap joint uses a double-welding seam process, the welding gun temperature is controlled to be 220-240 DEG C, and air bubbles are removed by compaction; S5, closed water test: the closed water test is performed for 48 hours after the construction is completed, the water level height is greater than or equal to 50 mm, and the leakage rate is less than or equal to 5%.

2. The material compatibility based waterproofing repair system of claim 1, wherein: The V-shaped grooves are formed by using a diamond cutting blade, the depth of the V-shaped grooves is 3-5 mm, the width is 5-7 mm, the groove wall roughness Ra is greater than or equal to 25, the groove is sprayed with an interface treatment agent after being cleaned, the bonding strength is greater than or equal to 1.0 MPa, the elongation of the modified polyurethane sealant is greater than or equal to 500%, and the bonding strength between the modified polyurethane sealant and the concrete base is greater than or equal to 0.5 MPa.

3. The material compatibility based waterproofing repair system of claim 1, wherein: The infrared thermal imager detection environment temperature is 15-25 DEG C, the roof is dried for 48 hours before detection, and the radar scanning frequency is 100-200 MHz.

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