A roof deformation joint structure

Abstract

The utility model provides a kind of roof deformation joint structure, including special female wall and straight female wall, and it is deformation joint between special female wall and straight female wall;Special female wall upper end is provided with the cantilevered slab of concrete pouring, cantilevered slab covers deformation joint and straight female wall, and it is a certain distance to exceed straight female wall finish surface, the top surface of cantilevered slab is pitched to special female wall direction;Special female wall lower end is provided with ladder-shaped enlarged foot, and the top surface of ladder-shaped enlarged foot is pitched to roof direction.The utility model in the roof deformation joint structure rationally utilizes the durability of concrete, replaces the scheme of adopting light metal sheet for plugging in conventional deformation joint structure, mainly with concrete waterproof, in the form of auxiliary ladder-shaped drainage, to solve the technical problems that conventional roof deformation joint structure construction is difficult, durability is poor, long-term waterproof effect is poor.

Description

Technical Field

[0001] This utility model relates to the field of parapet wall waterproofing construction technology, and in particular to a roof expansion joint structure. Background Technology

[0002] In large commercial buildings, dormitories, and educational buildings, uneven settlement is common due to their large spans, leading to harmful cracks and compromising structural safety. Therefore, expansion joints are often incorporated into the design of such structures to prevent these problems. However, the presence of these expansion joints leaves a 100-200mm wide space between the parapet walls after construction. This space is typically sealed with fire-resistant materials and sealant, then topped with polyethylene foam rods. Finally, lightweight metal sheets such as corrugated steel or aluminum alloy are used to seal the parapet walls for waterproofing. However, this method is complex, and the materials are prone to aging and damage over time, leading to leaks at the expansion joints, causing wall contamination, mold, and other quality issues that are difficult to repair and ultimately resolve.

[0003] Existing technology proposes a stepped expansion joint structure for the parapet walls on both sides of the expansion joint, while improving the fireproof sealing material into a concave arc-shaped fire-resistant strip and the top lightweight metal plate material into a convex semi-circular waterproof plate. This utility model patent simplifies construction and improves waterproofing to some extent, but with long-term use, there is still a risk of leakage due to material aging and damage. Utility Model Content

[0004] To overcome the problems existing in the prior art, this utility model provides a roof expansion joint structure. This roof expansion joint structure makes reasonable use of the durability of concrete, replacing the conventional expansion joint structure that uses lightweight metal plates for sealing. It takes concrete waterproofing as the main method and stepped drainage as a supplement to solve the technical problems of conventional roof expansion joint structures, such as high construction difficulty, poor durability, and poor long-term waterproofing effect.

[0005] A roof expansion joint structure includes an irregularly shaped parapet wall and a straight parapet wall, with an expansion joint between the irregularly shaped parapet wall and the straight parapet wall; a concrete cantilever slab is provided at the upper end of the irregularly shaped parapet wall, the cantilever slab covers the expansion joint and the straight parapet wall, and extends a certain distance beyond the finished surface of the straight parapet wall, the top surface of the cantilever slab slopes towards the irregularly shaped parapet wall; a stepped expansion foot is provided at the lower end of the irregularly shaped parapet wall, the top surface of the stepped expansion foot slopes towards the roof.

[0006] Furthermore, a recessed arc-shaped fire-resistant strip is provided at the top of the expansion joint; waterproof membrane is used for the roof waterproofing.

[0007] Furthermore, the waterproof membrane includes a first waterproof membrane and a second waterproof membrane. The first waterproof membrane is turned up to the top of the stepped expansion foot on one side of the irregular parapet wall and fixed to the irregular parapet wall with φ4 nails. The nail holes of the first φ4 nails are sealed with a first sealant. The second waterproof membrane is turned up to the top on one side of the straight parapet wall, nestled into the horizontal section of the expansion joint, and turned out to the side of the cantilever slab for fixing. The second waterproof membrane is fixed to the top of the straight parapet wall with a second φ4 nail and sealed with a second sealant. A polyethylene foam rod is pressed into the horizontal section of the expansion joint of the second waterproof membrane and sealed to the outside of the polyethylene foam rod with a third sealant.

[0008] Furthermore, the specified distance is 80mm.

[0009] Furthermore, the slope of the top surface of the cantilever slab towards the irregular parapet wall is 2%, and the thickness of the thinnest part of the cantilever slab is 100mm.

[0010] Furthermore, the height of the parapet wall exceeds the finished surface of the roof by no less than 250mm.

[0011] Furthermore, the slope of the top surface of the stepped enlarged foot facing the roof direction is 5%.

[0012] The beneficial effects of this utility model are that, compared with the prior art, it solves the problems of difficult construction, poor long-term waterproofing effect, and easy contamination of the internal walls of the expansion joint in traditional roof structures. It has the following beneficial effects.

[0013] (1) Improve construction efficiency: The fireproof sealing materials for the roof expansion joint structure are simplified. Arc-shaped fire-resistant strips are used instead of conventional organic or inorganic sealing materials, making construction convenient. At the same time, lightweight metal plates are eliminated and a one-time concrete structure is used, reducing the difficulty of construction. (2) Ensure construction quality: Avoid problems such as inadequate fireproof sealing and unstable fixing of lightweight metal plates; (3) Improve durability: Fireproof sealant and lightweight metal plate are optimized construction materials with low durability. The plate is used for fireproof sealing, and the concrete structure characteristics and stepped shape are used for waterproofing and drainage, which improves the long-term waterproofing ability of the expansion joint. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of a roof expansion joint structure according to this utility model.

[0015] Explanation of symbols in the attached diagram: 1. Irregularly shaped parapet wall; 11. Cantilever slab; 12. Stepped enlarged foot; 2. Straight parapet wall; 3. Expansion joint; 31. Curved firebreak. 4. Waterproof membrane; 41. First waterproof membrane; 42. Second waterproof membrane; 43. First φ4 nail; 44. First sealant. 45. Second φ4 nail, 46. Second sealant, 47. Polyethylene foam rod, 48. Third sealant. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0018] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0019] In the description of this patent, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] A roof expansion joint structure includes an irregularly shaped parapet wall 1 and a straight parapet wall 2, with an expansion joint 3 between the irregularly shaped parapet wall 1 and the straight parapet wall 2; a concrete cantilever slab 11 is provided at the upper end of the irregularly shaped parapet wall 1, the cantilever slab 11 covers the expansion joint 3 and the straight parapet wall 2, and extends a certain distance beyond the top surface of the straight parapet wall 3, the top surface of the cantilever slab 11 slopes towards the irregularly shaped parapet wall 1; a stepped enlarged foot 12 is provided at the lower end of the irregularly shaped parapet wall, the top surface of the stepped enlarged foot 12 slopes towards the roof.

[0021] Furthermore, such as Figure 1 As shown, a recessed arc-shaped fire-resistant strip 31 is provided at the top of the expansion joint 3; the roof waterproofing uses waterproof membrane 4.

[0022] Furthermore, such as Figure 1 As shown, the waterproof membrane 4 includes a first waterproof membrane 41 and a second waterproof membrane 42. The first waterproof membrane 41 is turned up to the top of the stepped expansion foot 12 on one side of the irregular parapet wall 1, and is fixed to the irregular parapet wall 1 with φ4 nails 43, and the nail holes of the first φ4 nails 43 are sealed with a first sealant 44. The second waterproof membrane 42 is turned up to the top on one side of the straight parapet wall 2, nestled into the horizontal section of the expansion joint 3, and turned out to the side of the cantilever slab 11 for fixation. The second waterproof membrane 42 is fixed to the top of the straight parapet wall 2 with a second φ4 nail 45 and sealed with a second sealant 46. A polyethylene foam rod 47 is pressed into the horizontal section of the expansion joint 3 by the second waterproof membrane 42, and is sealed to the outside of the polyethylene foam rod 47 with a third sealant 48.

[0023] Furthermore, such as Figure 1 As shown, the specified distance is 80mm.

[0024] Furthermore, such as Figure 1 As shown, the slope of the top surface of the cantilever slab 11 towards the irregular parapet wall 1 is 2%, and the thickness of the thinnest part of the cantilever slab 11 is 100mm.

[0025] Furthermore, the height of the parapet wall 2 extends at least 250mm beyond the top surface of the roof building.

[0026] Furthermore, the slope of the top surface of the stepped enlarged foot 12 facing the roof direction is 5%.

[0027] Example 1 This technical solution is a roof expansion joint structure. The construction of the parapet wall is carried out after the main structure roof concrete is poured and the floor slab concrete strength reaches 3MPa (about 4-6 hours after the concrete has set).

[0028] First, pour concrete for the parapet wall 2 according to the construction drawings and relevant construction plan requirements. After the concrete strength reaches 1.2MPa, remove the wall formwork.

[0029] Next, pour the 12-section stepped expansion foot, with a 5% slope towards the roof at the top. The construction joint is placed with the outside higher than the inside. After the concrete strength reaches 1.2 MPa, remove the wall formwork and roughen the construction joint.

[0030] Next, the recessed arc-shaped fire-resistant strip 31 is installed. The arc-shaped fire-resistant strip 31 is composed of two layers of stainless steel lining plates sandwiched with fire-resistant fiber felt, and is firmly fixed to the parapet wall concrete on both sides.

[0031] Next, pour the cantilever slab 11. The top of the cantilever slab 11 slopes towards the roof at 2%, with a minimum thickness of 1000mm, extending 80mm beyond the finished surface of the parapet wall 3. During the pouring of the cantilever slab, the upper reinforcement should be supported by steel bar supports to ensure the load-bearing effect of the upper reinforcement of the cantilever slab and avoid the quality risk of the cantilever slab breaking.

[0032] At this point, all concrete structure construction is complete.

[0033] Next, when constructing the waterproof membrane for the roof project, the first waterproof membrane 41 on one side of the irregular parapet wall 1 is flipped up to the top of the stepped enlarged foot 12 and fixed to the irregular parapet wall 1 with the first φ4 nails 43. The first φ4 nails 43 are spaced 500mm apart and sealed with the first sealant 44.

[0034] Next, after the second waterproof membrane 42 on one side of the parapet wall 2 is turned up to the top, it is pressed into the horizontal section of the expansion joint 3 with flexible material and turned out to the side of the cantilever 11 for fixation.

[0035] Next, the second φ4 nails 45 are used to fix the second waterproof membrane 42 at the top of the parapet wall 2 to prevent the waterproof membrane from collapsing and tearing the upper membrane; the second φ4 nails 45 are spaced 500mm apart and sealed with the second sealant 46.

[0036] Next, a polyethylene foam rod 47 is pressed into the horizontal section of the expansion joint 3 to tighten the second waterproof membrane 42 to prevent it from falling or tearing, and a third sealant 48 is applied to the outside of the polyethylene foam rod 47.

[0037] Finally, along the outer sides of the irregular parapet wall 1 and the straight parapet wall 2, as well as the upper part and sides of the cantilever slab 11, an M10 cement mortar surface layer is applied to protect the parapet walls and waterproof membrane, increasing the structure's durability and long-term waterproofing. The surface mortar layer is 20mm thick. It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A roof expansion joint structure, characterized in that, The structure includes an irregular parapet wall (1) and a straight parapet wall (2), with an expansion joint (3) between the irregular parapet wall (1) and the straight parapet wall (2); a concrete cantilever slab (11) is provided at the upper end of the irregular parapet wall (1), the cantilever slab (11) covers the expansion joint (3) and the straight parapet wall (2), and extends a certain distance beyond the top surface of the straight parapet wall (2), the top surface of the cantilever slab (11) slopes towards the irregular parapet wall (1); a stepped enlarged foot (12) is provided at the lower end of the irregular parapet wall, the top surface of the stepped enlarged foot (12) slopes towards the roof.

2. The roof expansion joint structure according to claim 1, characterized in that, The expansion joint (3) is provided with a recessed arc-shaped fire-resistant strip (31) at the top; the roof is waterproofed with waterproof membrane (4).

3. The roof expansion joint structure according to claim 2, characterized in that, The waterproof membrane (4) includes a first waterproof membrane (41) and a second waterproof membrane (42). The first waterproof membrane (41) is turned up to the top of the stepped expansion foot (12) on one side of the irregular parapet wall (1), and fixed to the irregular parapet wall (1) with φ4 nails (43). The nail holes of the first φ4 nails (43) are sealed with the first sealant (44). The second waterproof membrane (42) is turned up to the top on one side of the straight parapet wall (2), nestled into the horizontal section of the expansion joint (3), and turned out to the side of the cantilever board (11) for fixing. The second waterproof membrane (42) is fixed to the top of the straight parapet wall (2) with the second φ4 nails (45) and sealed with the second sealant (46). A polyethylene foam rod (47) is pressed into the horizontal section of the expansion joint (3) by the second waterproof membrane (42), and sealed to the outside of the polyethylene foam rod (47) with the third sealant (48).

4. The roof expansion joint structure according to claim 1, characterized in that, The specified distance is 80mm.

5. The roof expansion joint structure according to claim 1, characterized in that, The slope of the top of the cantilever slab (11) towards the irregular parapet wall (1) is 2%, and the thickness of the thinnest part of the cantilever slab (11) is 100mm.

6. The roof expansion joint structure according to claim 1, characterized in that, The height of the parapet wall (2) shall exceed the top surface of the roof by no less than 250 mm.

7. The roof expansion joint structure according to claim 1, characterized in that, The slope of the top surface of the stepped enlarged foot (12) facing the roof is 5%.

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