Fabricated building beam and slab joint waterproof structure

Abstract

The utility model discloses an assembly type building beam plate joint waterproof structure which comprises a beam body and prefabricated plates, every two adjacent prefabricated plates are in lap joint on the beam body to form a joint, and the upper surface and the joint portion of the beam body are coated with a special concrete sealing agent to form a sealing layer after being cleaned. The upper surface of the sealing layer of the beam body is coated with sealant to form a first isolation layer, the sealant is injected into the bottom of the joint to form a first sealing layer, a polyurethane foam plate is arranged above the first sealing layer to form a second isolation layer, and a cavity is formed between the second isolation layer and the upper side of the first sealing layer. And the upper side of the second isolation layer is coated with sealant to form a second sealing layer. The overall structural design of the two isolation layers and the two sealing layers is adopted, the thermal expansion and cold contraction changes of the joint are effectively coped, and water possibly permeating downwards is smoothly discharged through the cavity structure; the sealing layer is matched with the first isolating layer, so that joint water infiltration is effectively prevented, and safe and durable lap joint of the beam body and the prefabricated slab can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of building joint protection, in particular to a waterproof structure for the joint of precast beams and slabs of an assembled building. Background Technique

[0002] The construction of assembled buildings is to transport the prefabricated components modularly produced in the factory to the construction site and assemble them integrally through hoisting. It has the characteristics of standardized design, modular products, factory production, mechanized assembly, and refined management. It has great advantages in energy conservation, environmental protection, etc., and has been actively promoted. The waterproof problems of a large number of joints in assembled buildings have also received extensive attention, such as the vertical and horizontal joints of exterior wall panels during assembly, various expansion joints, etc. Roof leakage is a common problem in the construction industry. The failure of the waterproof structure of the precast slab joints in assembled buildings is more likely to cause cracks in the connection parts, resulting in potential water seepage hazards. Compared with traditional cast-in-place bridges, the precast bridge decks of assembled bridges rely on a large number of wet joints for connection, and it is inevitable to have diseases such as cracks and water seepage. Joint water seepage not only affects the use function of the building, but also causes concrete salt damage and alkali-silica reaction, etc., which in turn affects the safety of beam and slab structures and forms major potential safety accident hazards.

[0003] It is found through retrieval that the Chinese utility model patent with the publication number CN209323721 discloses a waterproof structure for the joints of precast slabs on the roof of an assembled building. For the joints of the beam body and the precast slab, a fine aggregate concrete layer is first filled, then a waterproof board is laid, a sealant layer is scraped, and then a waterproof coiled material tension avoidance layer is laid, and a waterproof coating layer is brushed. Although it has a good waterproof effect, its protection structure is relatively complicated. Pouring a fine aggregate concrete layer in the joint is not only difficult to cope with the deformation effect of thermal expansion and contraction of the joint, but also easily forms cracks or openings, resulting in water seepage on the upper surface directly infiltrating into the beam-slab lap surface. Long-term infiltration may even affect the safety of the precast slab lap. When similar joint structures in beam bodies of bridges appear infiltrated, it may even cause the precast slab to fall off, resulting in major accidents. Content of the Utility Model

[0004] The purpose of the utility model is to provide a waterproof structure for the joints of precast beams and slabs of an assembled building to solve the problems raised in the above background technique.

[0005] To achieve the above object, the utility model provides the following technical solution: a waterproof structure for the joint of a prefabricated building beam and slab, including a beam body and precast slabs. Two adjacent precast slabs overlap on the beam body to form a joint. The upper surface of the beam body and the joint part are coated with a special concrete sealant after cleaning to form a sealing layer. A sealant is coated on the upper surface of the sealing layer of the beam body to form a first isolation layer. A sealant is injected into the bottom of the joint to form a first sealing layer. A polyurethane foam board is arranged above the first sealing layer to form a second isolation layer. A cavity is formed between the upper side of the second isolation layer and the first sealing layer. A sealant is scraped on the upper side of the second isolation layer to form a second sealing layer. The upper surface of the second sealing layer is flush with the upper surface of the precast slab.

[0006] Preferably, a decorative protective layer is provided on the upper side of the second sealing layer. The decorative protective layer is a flexible fluorocarbon topcoat layer or a flexible acrylic polyurethane topcoat layer.

[0007] Preferably, the dry film thickness of the topcoat layer in the decorative protective layer is not less than 70μm.

[0008] Preferably, the first isolation layer is formed by scraping a two-component MS sealant and its thickness is not less than 8mm, and the thickness of the sealing layer is not less than 70μm.

[0009] Preferably, the thickness of the first sealing layer is not less than 10mm and does not exceed 1 / 4 of the thickness of the precast slab.

[0010] Preferably, the height of the cavity is not less than 1 / 4 of the thickness of the precast slab.

[0011] Preferably, the thickness of the second isolation layer is not less than 10mm and does not exceed 1 / 4 of the thickness of the precast slab.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts the overall structural design of two isolation layers and two sealing layers, effectively coping with the thermal expansion and contraction changes of the joint, and using the cavity structure to smoothly discharge the water that may seep down; the combination design of the sealing layer and the first isolation layer effectively prevents the infiltration of joint water, and can ensure the safe and durable lap of the beam body and the precast slab. The improved design of the entire joint waterproof structure is simple and the construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional structure diagram of the utility model.

[0014] In the figure: 1. Beam body; 2. Precast slab; 3. Joint; 4. Second sealing layer; 5. Second isolation layer; 6. Cavity; 7. First sealing layer; 8. First isolation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0016] Please refer to Figure 1 , the present invention provides a technical solution: a waterproof structure for the joint of precast floor and beam of an assembled building, including a beam body 1 and precast slabs 2. Two adjacent precast slabs 2 are overlapped on the beam body 1 to form a joint 3. After the upper surface of the beam body 1 and the joint 3 are cleaned, a special concrete sealant (such as ZQ-300 primer for assembled buildings) is applied to form a sealing layer. After the sealing layer is dry to the touch, a layer of ZQ-301 sealant for assembled buildings (two-component, model F-25LM) is scraped on the surface of the sealing layer on the upper surface of the beam body in a timely manner. The thickness of the sealant layer is 10 mm to form a first isolation layer 8. The thickness of the first sealing layer 7 is not less than 10 mm and does not exceed 1 / 4 of the thickness of the precast slab 2.

[0017] ZQ-301 sealant for assembled buildings (two-component, model F-25LM) is used to apply and scrape glue at the bottom of the joint 3 to form a first sealing layer 7 with a thickness of 10 mm. A polyurethane foam board is arranged above the first sealing layer 7 to form a second isolation layer 5. The thickness of the second isolation layer 5 is not less than 10 mm and does not exceed 1 / 4 of the thickness of the precast slab 2. A cavity 6 is formed between the upper side of the second isolation layer 5 and the first sealing layer 7. The height of the cavity 6 is not less than 1 / 4 of the thickness of the precast slab 2. ZQ-301 sealant for assembled buildings (two-component, model F-25LM) is scraped on the second isolation layer 5 to form a second sealing layer 4. The upper surface of the second sealing layer 4 is flush with the upper surface of the precast slab 2. After the second sealing layer 4 is dry to the touch, 2 coats of Zijinhua flexible fluorocarbon topcoat are brushed on the surface of the second sealing layer 4. The total thickness of the flexible fluorocarbon topcoat coating is 70 μm to form a decorative and protective layer. The dry film thickness of the topcoat coating in the decorative and protective layer is not less than 70 μm.

[0018] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waterproof structure for prefabricated building beam and slab joints, comprising a beam body (1) and a prefabricated slab (2), wherein two adjacent prefabricated slabs (2) are overlapped on the beam body (1) to form a joint (3), characterized in that: The upper surface of the beam body (1) and the joint (3) are coated with a special sealant for concrete after cleaning to form a sealing layer, the upper surface of the sealing layer of the beam body (1) is coated with a sealant to form a first insulating layer (8), the bottom of the joint (3) is injected with a sealant to form a first sealing layer (7), a polyurethane foam board is arranged above the first sealing layer (7) to form a second insulating layer (5), a cavity (6) is formed between the second insulating layer (5) and the upper side of the first sealing layer (7), the upper side of the second insulating layer (5) is coated with a sealant to form a second sealing layer (4), and the upper surface of the second sealing layer (4) is flush with the upper surface of the prefabricated board (2).

2. The assembled building beam-slab joint waterproof structure according to claim 1, characterized in that: A decorative protective layer is provided on the upper side of the second sealing layer (4), and the decorative protective layer is a flexible fluorocarbon topcoat coating or a flexible acrylic polyurethane topcoat coating.

3. The assembled building beam-slab joint waterproof structure according to claim 2, characterized in that: The dry film thickness of the topcoat coating in the decorative protective layer is not less than 70 μm.

4. The assembled building beam-slab joint waterproof structure according to claim 1, characterized in that: The first isolation layer (8) is formed by scraping a two-component MS sealant and has a thickness of not less than 8 mm, and the thickness of the sealing layer is not less than 70 μm.

5. The assembled building beam-slab joint waterproof structure according to claim 1, characterized in that: The thickness of the first sealing layer (7) is not less than 10 mm and not more than 1 / 4 of the thickness of the prefabricated board (2).

6. The assembled building beam-slab joint waterproof structure according to claim 5, characterized in that: The height of the cavity (6) is not less than 1 / 4 of the thickness of the prefabricated board (2).

7. The assembled building beam-slab joint waterproof structure according to claim 6, characterized in that: The thickness of the second isolation layer (5) is not less than 10 mm and not more than 1 / 4 of the thickness of the prefabricated board (2).

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