Lightweight high ductility concrete permanent form with three-dimensional steel reinforcement
Patent Information
- Application Number
- CN202522515240.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-11-27
AI Technical Summary
[0004]但是，现有技术在使用中还存在不足：首先，普通的预制混凝土薄板本身韧性不足，在吊装、搬运及混凝土浇筑冲击下极易开裂；其次，即便薄板完好，其光滑的表面与后浇混凝土的粘结强度有限，易在结合界面形成薄弱层，导致结构在受力时出现“两张皮”现象，严重破坏了整体受力性能
1、本实用新型通过采用由轻质高延性混凝土制成并在内部均匀混合有短切纤维的预制薄板，解决了薄板脆性问题，这些随机分布的短切纤维能够有效地桥接和抑制微裂缝的发展，使薄板在承受吊装、搬运及混凝土浇筑冲击时，表现出高延性和高韧性，从而确保了预制薄板在施工过程中的完整性与可靠性，避免了因开裂导致的失效，预制薄板浇筑后无需拆除，节省了工序、时间和成本。
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Figure CN224870722U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of permanent formwork technology for construction, specifically a lightweight, high-ductility concrete permanent formwork with a three-dimensional steel mesh. Background Technology
[0002] In cast-in-place concrete structure engineering, formwork engineering is a crucial process to ensure the shape and dimensions of the structure. Its design and construction quality directly affect the efficiency, cost, and final structural performance of the project. From traditional wooden and steel formwork to various modern standardized formwork, technological advancements have always revolved around the core goal of better realizing design intent, improving construction efficiency, and reducing overall costs.
[0003] Currently, in the pursuit of improved construction efficiency, the industry has seen attempts to use precast concrete slabs as permanent formwork. This approach aims to use precast slabs as formwork for pouring concrete, which are then retained after the concrete hardens, becoming an integral part of the structure.
[0004] However, existing technologies still have shortcomings in use: First, ordinary precast concrete thin slabs themselves lack toughness and are prone to cracking under the impact of hoisting, handling and concrete pouring; Second, even if the thin slab is intact, its smooth surface has limited bonding strength with the post-poured concrete, which easily forms a weak layer at the interface, causing the structure to exhibit a "two-skin" phenomenon when under stress, which seriously damages the overall load-bearing performance. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a lightweight, high-ductility concrete permanent formwork with a three-dimensional steel mesh. By combining lightweight, high-ductility concrete with short-cut fibers, failure caused by cracking during hoisting, handling and concrete pouring impact is avoided, which can effectively solve the problems in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a lightweight, high-ductility concrete permanent formwork with a three-dimensional steel mesh, comprising a base, an integrated steel mesh on the base, a vertically downward extending main structural steel bar welded joint on the integrated steel mesh, the end of the main structural steel bar welded joint contacting the base, prefabricated thin plates around the base, and thin plate steel bar trusses that cooperate with the main structural steel bar welded joints on the prefabricated thin plates, and installation grooves that cooperate with the main structural steel bar welded joints are provided on the prefabricated thin plates. The base serves as the bottom support and positioning benchmark for the entire structure. An integrated steel mesh is pre-erected and welded onto the base to form a spatial skeleton. The welded joints of the main structural steel bars extend downwards from the steel mesh and contact the base, achieving vertical load-bearing. Precast thin plates are precisely aligned with the welded joints of the main structural steel bars through their mounting grooves, enabling rapid positioning. The thin plate steel trusses on the precast thin plates are clamped on both sides of the welded joints of the main structural steel bars and fixed by welding. Four precast thin plates are installed around the base in sequence, connecting all the precast thin plates and the core steel skeleton into a whole. Finally, concrete is poured, and the precast thin plates and the poured concrete combine into a complete whole with good integrity. The precast thin plates serve as permanent formwork and do not need to be removed after pouring, saving processes, time, and costs.
[0007] Furthermore, the inner surface of the precast thin slab is rough. When the subsequent concrete is poured, the cement slurry will penetrate and coat these uneven areas, effectively preventing separation of the bonding surfaces and enhancing the integrity of the precast thin slab and the subsequent concrete.
[0008] Furthermore, the inner surface of the precast thin plate is a rough surface with holes. These holes will be completely filled by the subsequent concrete pouring, making the bond stronger.
[0009] Furthermore, the inner surface of the precast thin slab is uniformly provided with rough bonding blocks. These rough bonding blocks can better bond with the subsequently poured concrete, forming a whole and making the bond stronger.
[0010] Furthermore, the rough bonding block is serrated or stump-shaped.
[0011] Furthermore, the vertical edges of the prefabricated thin plates are provided with beveled edge bonding blocks. When two prefabricated thin plates are spliced together, the prefabricated thin plates can be tightly bonded together through the beveled bonding surfaces on the beveled edge bonding blocks.
[0012] Furthermore, the precast thin slab is uniformly mixed with short-cut fibers. The short-cut fibers are evenly distributed in the concrete, forming a three-dimensional network support, which makes the precast thin slab less prone to cracking under the impact of handling, installation and concrete pouring.
[0013] Furthermore, the precast thin slab is made of lightweight, high-ductility concrete. The lightweight nature of the high-ductility concrete reduces the self-weight of the precast thin slab, making handling and installation easier. Its high ductility allows it to exhibit metal-like plastic deformation capacity rather than brittle fracture when subjected to bending loads, ensuring safety and integrity during construction. When used as an external structural protective layer, it can significantly improve the overall structural durability.
[0014] Based on the above technical solution, the beneficial effects achieved by this utility model of a lightweight, high-ductility concrete permanent formwork with a three-dimensional steel mesh through practical application are as follows: 1. This utility model solves the problem of brittleness of thin slabs by using precast thin slabs made of lightweight, high-ductility concrete and uniformly mixed with short-cut fibers inside. These randomly distributed short-cut fibers can effectively bridge and inhibit the development of micro-cracks, enabling the thin slabs to exhibit high ductility and high toughness when subjected to hoisting, handling and concrete pouring impacts. This ensures the integrity and reliability of the precast thin slabs during construction, avoids failures caused by cracking, and eliminates the need for removal after pouring, saving processes, time and costs.
[0015] 2. The rough bonding blocks or holes provided on the inner side of the precast thin plate in this utility model provide a strong embedding and interlocking surface for the post-cast concrete. This greatly enhances the shear resistance of the bonding surface, prevents relative slippage, and the precast thin plate and the post-cast concrete are integrated into one body with good integrity and no "two-layer" phenomenon. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the prefabricated thin plate of this utility model installed on the base.
[0017] Figure 2 This is a three-dimensional structural diagram of the base and integrated steel mesh in this utility model.
[0018] Figure 3 This is a front-view three-dimensional structural diagram of the prefabricated thin plate in this utility model.
[0019] Figure 4 This is a side-view perspective view of the three-dimensional structure of the present invention, showing the installation of four prefabricated thin plates on the base.
[0020] In the diagram: 1-base, 2-precast thin plate, 3-thin plate steel truss, 4-main structure steel reinforcement welded joint, 5-edge oblique bonding block, 6-rough bonding block, 7-integrated steel mesh, 8-installation groove. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figure 1-4 This embodiment provides a technical solution: a lightweight, high-ductility concrete permanent formwork with a three-dimensional steel mesh, including a base 1, an integrated steel mesh 7 on the base 1, a vertically downward extending main structural steel welded head 4 on the integrated steel mesh 7, and the end of the main structural steel welded head 4 in contact with the base 1. Precast thin plates 2 are provided around the base 1, and thin plate steel trusses 3 that cooperate with the main structural steel welded heads 4 are provided on the precast thin plates 2. Installation grooves 8 that cooperate with the main structural steel welded heads 4 are opened on the precast thin plates 2. The base 1 serves as the bottom support and positioning benchmark for the entire structure. An integrated steel mesh 7 is pre-erected and welded onto the base 1 to form a spatial skeleton. The main structural steel reinforcement welded joints 4 extend downward from the steel mesh 7 and contact the base 1, achieving vertical load bearing. The precast thin plates 2 are precisely aligned with the main structural steel reinforcement welded joints 4 through the mounting grooves 8 on them, thus enabling rapid positioning. The thin plate steel trusses 3 on the precast thin plates 2 are clamped on both sides of the main structural steel reinforcement welded joints 4 and fixed by welding. The four precast thin plates 2 are installed around the base 1 in sequence, connecting all the precast thin plates 2 and the core steel reinforcement skeleton into a whole. Finally, concrete is poured, and the precast thin plates 2 and the poured concrete combine into a complete whole with good integrity. The precast thin plates 2 serve as permanent formwork and do not need to be removed after pouring, saving processes, time, and costs.
[0023] Furthermore, the inner surface of the precast thin slab 2 is rough. When the subsequent concrete is poured, the cement slurry will penetrate and coat these uneven areas, effectively preventing separation of the bonding surfaces and enhancing the integrity of the precast thin slab 2 and the subsequent concrete.
[0024] Furthermore, the inner surface of the precast thin slab 2 is a rough surface with holes. These holes will be completely filled by the subsequent concrete pouring, making the bond stronger.
[0025] Furthermore, rough bonding blocks 6 are evenly distributed on the inner surface of the precast thin slab 2. The rough bonding blocks 6 can better bond with the post-poured concrete to form a whole, making the bond stronger.
[0026] Furthermore, the rough bonding block 6 is serrated or stump-shaped.
[0027] Furthermore, the vertical edges of the precast thin plate 2 are provided with beveled edge bonding blocks 5. When two precast thin plates 2 are spliced together, the precast thin plates 2 can be tightly bonded by the beveled bonding surfaces on the beveled edge bonding blocks 5.
[0028] Furthermore, the precast thin slab 2 is uniformly mixed with short-cut fibers. The short-cut fibers are evenly distributed in the concrete, forming a three-dimensional network support, which makes the precast thin slab 2 less prone to cracking under the impact of handling, installation and concrete pouring.
[0029] Furthermore, the precast thin slab 2 is made of lightweight, high-ductility concrete. The lightweight nature of the high-ductility concrete reduces the self-weight of the precast thin slab 2, making handling and installation easier. Its high ductility allows it to exhibit metal-like plastic deformation capacity rather than brittle fracture when subjected to bending loads, ensuring safety and integrity during construction. When used as an external structural protective layer, it can significantly improve the overall structural durability.
[0030] The working principle of the lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh provided by this utility model is as follows: In use, the integrated steel mesh 7 is first erected and welded onto the base 1 to form a spatial skeleton. The main structural steel reinforcement welded head 4 extends downward from the steel mesh 7 and contacts the base 1, achieving vertical load bearing. The precast thin plate 2 is precisely aligned with the main structural steel reinforcement welded head 4 through the mounting groove 8 on it, thus achieving rapid positioning. The thin plate steel truss 3 on the precast thin plate 2 is clamped on both sides of the main structural steel reinforcement welded head 4 and fixed by welding. The four precast thin plates 2 are welded and installed around the base 1 in sequence, connecting all the precast thin plates 2 and the core steel reinforcement skeleton into a whole. Finally, concrete is poured. During concrete pouring, the rough bonding block 6 on the inner side of the precast thin plate 2 can better bond with the subsequently poured concrete to form a whole, making the bond stronger and the integrity better, avoiding the "two skins" phenomenon. It is particularly suitable for complex-shaped shear walls, irregular columns, etc. The precast thin plate 2 serves as a permanent formwork and does not need to be removed after pouring, saving procedures, time and costs.
[0031] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A lightweight, high-ductility concrete permanent formwork with a three-dimensional steel mesh, comprising a base, characterized in that: An integrated steel mesh is provided on the base, and vertically downward extending main structural steel bar welded joints are provided on the integrated steel mesh, with the ends of the main structural steel bar welded joints contacting the base. Precast thin plates are provided around the base, and thin plate steel bar trusses that cooperate with the main structural steel bar welded joints are provided on the precast thin plates. Installation grooves that cooperate with the main structural steel bar welded joints are provided on the precast thin plates.
2. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 1, characterized in that: The inner surface of the precast thin plate is rough.
3. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 1, characterized in that: The inner surface of the precast thin plate is a rough surface with holes.
4. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 1, characterized in that: The inner surface of the precast thin plate is uniformly provided with rough bonding blocks.
5. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 4, characterized in that: The rough bonding block is serrated or plum blossom-shaped.
6. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 1, characterized in that: The vertical edge of the precast thin plate is provided with an edge bevel bonding block.
7. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 1, characterized in that: The precast thin plate contains a uniform mixture of short-cut fibers.
8. The lightweight, high-ductility concrete permanent formwork with three-dimensional steel mesh according to claim 1, characterized in that: The precast thin slab is made of lightweight, high-ductility concrete.