Fire resistant cage form assembled monolithic vertical member with internal rib construction

Abstract

The utility model belongs to the technical field of fabricated building engineering, concretely relates to a kind of inner rib structure fire-resistant cage mould assembly monolithic vertical component, including the cage mould membrane shell prefabricated by fine stone concrete, the cage mould membrane shell is cavity structure, as permanent formwork and inner cavity post-cast concrete form integral force system;The inner side wall of the cage mould membrane shell is equipped with inner rib structure;The side edge splicing contact surface of the cage mould membrane shell is equipped with depth embossed concave-convex structure;The wall thickness middle part of the cage mould membrane shell is embedded with continuous steel mesh;Modified tensile fibre and hot melt fire-resistant fibre are uniformly doped in the prefabricated substrate of the cage mould membrane shell.The utility model realizes the integration of prefabricated cage mould and post-cast concrete, strengthens the connection integrity, eliminates concrete high-temperature burst hidden danger, improves the anti-cracking and anti-bending ability of component full life cycle, can be widely applied to the vertical load-bearing structure of various buildings, realizes the stress performance equivalent to cast-in-place of assembly monolithic structure.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated building engineering technology, specifically relating to an internally ribbed fire-resistant cage-type prefabricated integral vertical component. Background Technology

[0002] Prefabricated buildings, with their advantages of high construction efficiency, energy conservation and environmental protection, and high degree of industrialization, have become the mainstream direction for the transformation and upgrading of the construction industry. Among them, prefabricated cage-type monolithic vertical components are an important form of prefabricated structure. They use prefabricated cage-type membrane shells as permanent templates, and pour concrete into the cavity on the construction site to form an integral load-bearing wall. They combine the construction convenience of prefabricated components with the overall load-bearing advantages of cast-in-place structures, and have been widely used in the vertical load-bearing shear wall structures of residential and public buildings.

[0003] However, the existing cage-formed vertical components still have several technical defects in practical applications, which restrict the further improvement of their structural safety and durability performance: 1. Poor Interface Coordination: The inner surface of conventional cage-formed membrane shells is usually smooth and flat, relying solely on the adhesive bond of the materials themselves to bond with the subsequently poured inner concrete. This connection method lacks mechanical interlocking, resulting in insufficient effectiveness of the interface contact and poor collaborative working ability. During long-term load bearing or shrinkage deformation of the component, the interface between the membrane shell and the post-poured concrete is prone to delamination, slippage, or even separation, significantly weakening the overall load-bearing capacity and stiffness of the vertical component, making it difficult to achieve the same stress effect as cast-in-place structures. Furthermore, thin-walled cage-formed membrane shells themselves have relatively small wall thickness and weak stiffness, making them prone to deformation and cracking under their own weight and construction loads, further exacerbating the interface separation problem.

[0004] 2. Weak Bonding at the Joints: The side joints of traditional cage-like membrane structures are smooth planes, resulting in weak bonding between the membrane structure sides and the cast-in-place concrete overlay after the components are installed side-by-side. Under horizontal loads, seismic forces, or shrinkage caused by temperature changes, through cracks are prone to form at the joints. This not only compromises the integrity of the wall but also negatively impacts the structure's waterproofing, seepage prevention, and seismic performance.

[0005] 3. Insufficient fire resistance: Existing cage-formed structures typically use ordinary fine-aggregate concrete, which contains a large amount of free water, capillary water, and crystal water. In the event of a fire, under high temperatures, the moisture inside the concrete rapidly vaporizes, forming high-pressure steam. Due to the poor gas permeability of dense concrete, this steam cannot escape in time. The rapidly expanding steam pressure directly causes the concrete surface to crack and peel off, and in severe cases, may even cause the entire structure to burst. This will damage the effective cross-section of vertical members, expose internal reinforcing steel, and lead to a rapid decrease in structural load-bearing capacity, posing a significant fire safety hazard.

[0006] 4. Brittle and fragile components: Precast cage-like membrane shells are generally made of fine aggregate concrete, which is inherently brittle and has poor crack resistance. During factory prefabrication, off-site transportation, and on-site hoisting, the thin-walled membrane shells are prone to cracking or localized damage due to lateral shear forces. Simultaneously, during the inner cavity concrete pouring stage, the lateral pressure of the pouring and the localized vibration loads generated by mechanical compaction can also easily cause localized cracking of the thin-walled membrane shells, and even lead to accidents such as bulging or bursting of the formwork, affecting construction quality and safety.

[0007] In summary, existing cage-formed monolithic vertical components urgently need optimization and improvement in terms of interface coordination, overlapping connections, fire resistance, and crack and damage prevention. Utility Model Content

[0008] The purpose of this invention is to provide a fire-resistant, assembled, monolithic vertical cage-like structure with internal ribs. This structure integrates the internal structure of the cage-like structure, the side splicing surface structure, the matrix material, and the reinforcement method. It aims to solve the technical problems of insufficient collaboration between the existing cage-like structure and the post-cast concrete, weak connections in the overlapping zones, susceptibility to cracking at high temperatures, and the brittleness and fragility of the membrane shell, thereby achieving the same load-bearing performance as cast-in-place concrete in an assembled monolithic structure.

[0009] Specifically, this utility model provides the following technical solution: A fire-resistant cage-formed modular vertical component with internal rib structure includes a cage-formed membrane shell prefabricated from fine aggregate concrete; the cage-formed membrane shell is a hollow structure, which serves as a permanent template and forms an integral load-bearing system with the post-poured concrete in the inner cavity; The inner wall of the cage mold shell is provided with an inner rib structure; The side splicing contact surface of the cage mold shell is provided with a deep embossed concave-convex structure; A continuous steel mesh is pre-embedded in the middle of the wall thickness of the cage mold shell; The prefabricated substrate of the cage mold shell is uniformly doped with modified tensile fibers and hot-melt fire-resistant fibers.

[0010] Preferably, the inner rib structure is at least one of the following: a raised strip-shaped inner rib structure, a dot-shaped inner rib structure, and a recessed groove-shaped inner rib structure, used to form an interlocking connection with the post-poured concrete of the inner cavity.

[0011] More preferably, when the inner rib structure is a raised strip-shaped inner rib structure, its raised height is 5-20mm, the spacing is 100-300mm, the raised cross section is rectangular, trapezoidal, or arc-shaped, and it is arranged perpendicular to the inner wall of the precast cage membrane shell or at an angle of 45-60°; when the inner rib structure is a recessed groove-shaped inner rib structure, its recessed depth is 5-15mm, the spacing is 100-300mm, the recessed cross section is rectangular, trapezoidal, or arc-shaped, and it is distributed on the left and right sides of the inner wall of the precast cage membrane shell.

[0012] Preferably, the deep embossed texture is a continuous toothed groove, corrugated, or textured surface; the texture depth of the deep embossed texture is 3-10mm, the texture spacing is 5-20mm, and the texture structure runs through the side splicing surface of the entire precast cage membrane shell, ensuring the micro-mechanical interlocking of adjacent membrane shell splicing and cast-in-place overlapping zone.

[0013] Preferably, the reinforcing mesh is a continuous wire mesh, pre-embedded in the middle of the wall thickness of the precast cage membrane shell, used to resist the tensile stress generated by the hardening shrinkage and thermal shrinkage deformation of the membrane shell concrete, and to inhibit the development of shrinkage cracks; the diameter of the reinforcing bars is 4-6mm, the mesh size is 50-100mm, and the distance between the reinforcing mesh and the inner wall of the precast cage membrane shell is not less than 1 / 3 of the membrane shell wall thickness and not less than 10mm.

[0014] Preferably, the modified tensile fiber is steel fiber, and its dosage is 0.3%-2.0% of the volume of the precast substrate. It is used to improve the overall ductility, toughness and shear resistance of the membrane shell, and reduce the risk of cracking and damage caused by lateral shear load during the prefabrication, off-site transportation and on-site hoisting of the cage.

[0015] More preferably, the modified tensile fiber is one or more of steel fibers that have undergone shaping treatments such as corrugation, end hooks, or end profiles.

[0016] Preferably, the hot-melt fire-resistant fiber is one or more of polypropylene fiber, polyester fiber, polyoxymethylene fiber, or polyethylene fiber, with a melting point of 120-200℃, and the dosage is 0.5%-3.5% of the volume of the precast substrate. Under normal conditions, the hot-melt fire-resistant fiber is uniformly dispersed in the concrete matrix, without affecting the strength, workability, or casting performance of the concrete. When exposed to high-temperature fire conditions, the hot-melt fire-resistant fiber melts and dissolves, forming interconnected micro-capillary pores and gas transport channels inside the concrete cage, which release the expansion pressure generated by the high-temperature water vapor inside the concrete.

[0017] Preferably, the wall thickness of the cage mold shell is 20-50mm, the inner cavity size of the cage mold shell matches the design section of the post-cast concrete, and after casting, the protruding inner rib structure is completely wrapped by the post-cast concrete, and the concave inner rib structure is completely and densely filled by the post-cast concrete, forming a stable mechanical meshing connection structure.

[0018] Preferably, the system also includes a reinforcing cage disposed within the cavity of the cage mold shell.

[0019] Preferably, the cage mold shell is provided with pull holes.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) Significantly improved interface synergy: The internal rib structure set on the inner wall of the cage-form membrane shell realizes the mechanical interlocking and physical bonding between the membrane shell and the post-cast concrete. This fundamentally solves the problems of poor bonding and easy delamination and slippage of traditional smooth interfaces, ensuring that the two are synergistically stressed. At the same time, the internal rib structure is equivalent to the stiffening ribs of the membrane shell, which improves the stiffness of the thin-walled membrane shell itself, making the stress performance of the entire prefabricated component equivalent to that of the cast-in-place structure, and significantly improving the structural safety reserve.

[0021] (2) Enhanced integrity of the overlapping connection: The deep embossed texture on the side of the cage mold shell greatly increases the roughness and contact area of ​​the splicing surface, strengthening the lateral bonding and shear resistance between the splicing surface and the post-cast overlapping concrete. This effectively prevents the splicing interface from cracking or peeling due to stress or deformation, thereby improving the overall waterproofing, earthquake resistance and durability of the wall.

[0022] (3) Outstanding fire safety performance: By incorporating hot-melt fire-resistant fibers into the concrete substrate, the fibers melt and form pressure relief channels when the component encounters a fire, effectively releasing the high-temperature steam pressure generated by the vaporization of moisture inside the concrete. This can prevent the concrete from cracking and peeling off at high temperatures, significantly extending the fire resistance limit of vertical components and meeting the requirements of building fire protection design codes.

[0023] (4) Excellent crack and damage resistance throughout the entire process: This utility model adopts a reinforcement system composed of steel mesh and modified tensile fiber. The steel mesh mainly resists macroscopic shrinkage cracks, while the diffusely distributed tensile fiber inhibits the generation and propagation of microscopic cracks and improves the toughness and shear resistance of the component. This dual reinforcement mechanism takes into account the multiple requirements of shrinkage crack resistance, shear damage resistance and anti-burst mold in casting, and can effectively cope with various loads in the entire construction process, including factory prefabrication, transportation and hoisting, and on-site casting, and significantly reduce the breakage rate of the component.

[0024] (5) Strong construction adaptability and high degree of industrialization: All structures can be prefabricated in one piece using factory molds, without the need for on-site secondary processing and modification. The construction process is simple and the assembly efficiency is high, making it suitable for large-scale and standardized prefabricated building construction promotion and application. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall structure of an embodiment of this utility model.

[0026] Figure 2 yes Figure 1 A schematic diagram of the steel reinforcement cage.

[0027] Figure 3 yes Figure 1 A schematic diagram of the structure of the middle cage mold shell.

[0028] Figure 4 yes Figure 3 A partially enlarged structural diagram of the inner cage mold shell.

[0029] Figure 5 This is a schematic diagram of a single-sided cage-like membrane shell.

[0030] The markings in the diagram are: 1-cage mold shell, 2-reinforcing cage, 3-deep embossed texture, 4-pull hole, 5-protruding strip-shaped inner rib structure, 6-recessed groove-shaped inner rib structure, 7-reinforcing mesh. Detailed Implementation

[0031] To make the objectives, technical solutions and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0032] Example 1 like Figures 1 to 5 As shown, this utility model provides an integral vertical component with an internally ribbed fire-resistant cage-like structure. The component mainly consists of a prefabricated cage-like membrane shell 1 and a reinforcing cage 2 subsequently installed within it. At the construction site, after assembling both components, concrete is poured into the inner cavity of the cage-like membrane shell 1, ultimately forming an integrally load-bearing vertical component (such as a shear wall).

[0033] Reference Figure 3 , Figure 4 and Figure 5 The cage-like membrane shell 1 is the core of this utility model. It is prefabricated integrally from high-performance fine aggregate concrete using a mold, and its wall thickness is typically 20-50mm. Its key structural features are: First, an integrally formed inner rib structure is formed on the inner wall of the precast membrane shell 1. As shown in the figure, these inner rib structures can be raised strip-shaped inner rib structures 5, recessed groove-shaped inner rib structures 6, or a combination of both. In a preferred embodiment, the height of the raised strip-shaped inner rib structures 5 can be 5-20 mm, the spacing can be 100-300 mm, and their cross-section can be designed as rectangular, trapezoidal, or arc-shaped to enhance the interlocking effect. The depth of the recessed groove-shaped inner rib structures 6 can be 5-15 mm. After the inner cavity concrete is poured and hardened, the subsequent concrete will completely enclose the raised strip-shaped inner rib structures 5 and fill the recessed groove-shaped inner rib structures 6, thereby forming a stable mechanical interlocking connection, which greatly improves the interfacial shear transfer capacity between the precast membrane shell and the subsequent concrete, ensuring that the two work together.

[0034] Second, a deep embossed texture 3 is provided on the side splicing contact surface of the cage mold shell 1. For example... Figure 4As shown, this structure can be continuous toothed, corrugated, or textured, with a preferred texture depth of 3-10 mm. This structure extends throughout the entire side splicing surface, and when adjacent cage mold shells are spliced ​​or connected with post-cast overlapping strips, it can form a microscopic mechanical interlock, significantly enhancing the bonding strength and shear resistance of the splicing joint.

[0035] Third, a composite reinforcement system was adopted to improve the mechanical properties and durability of the cage mold shell 1. For example... Figure 4 As shown, a reinforcing mesh 7 is pre-embedded in the middle of the membrane shell wall thickness. This reinforcing mesh 7 is a wire mesh, with a preferred steel bar diameter of 4-6 mm and a mesh size of 50-100 mm. It effectively constrains the shrinkage deformation of the concrete and prevents the formation of macroscopic cracks. Simultaneously, two functional fibers are uniformly incorporated into the precast substrate (high-performance fine aggregate concrete) of the cage-form membrane shell 1: Modified tensile fibers: such as corrugated or hooked steel fibers, can be added at a rate of 0.3%-2.0% of the substrate volume. These fibers are distributed randomly in three dimensions in the concrete matrix, which can effectively improve the toughness, impact resistance and shear resistance of the membrane shell, and prevent it from cracking and breaking due to uneven stress during transportation and hoisting.

[0036] Hot-melt fire-resistant fibers, such as polypropylene fibers, can be incorporated into the substrate at a rate of 0.5%-3.5% of its volume. These fibers have a low melting point, and during a fire, they melt inside the concrete, forming an interconnected capillary network. This network acts as a "pressure relief channel" for water vapor, allowing high-pressure steam to escape smoothly, thus preventing the concrete from cracking and ensuring the structural integrity of the component under fire.

[0037] like Figure 2 As shown, the reinforcing cage 2 is a conventional reinforcing mesh cage, configured according to the structural design requirements, and hoisted into the cavity of the cage formwork 1 on site. The cage formwork 1 also has pre-drilled tie holes 4 for threading tie bolts to ensure the spacing and stability of the two sides of the formwork during concrete pouring.

[0038] The working process and principle of this utility model are summarized as follows: A precast membrane shell 1, incorporating the aforementioned optimized structures, is prefabricated in a factory. After being transported to the construction site, it is hoisted, assembled, and fitted with a reinforcing cage 2. Subsequently, concrete is poured into the inner cavity of the membrane shell. Due to the presence of the raised strip-shaped inner rib structure 5 and the recessed groove-shaped inner rib structure 6, the precast membrane shell and the subsequently poured concrete form a strong mechanical interlock; due to the presence of the deep-embossed concave-convex structure 3, the connection between adjacent components is more compact and reliable; due to the presence of the composite reinforcement system (steel mesh 7 + two types of fibers), the component exhibits excellent crack resistance, damage resistance, and fire resistance throughout its entire life cycle.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fire-resistant, integrated vertical cage-formed structure with internal ribs, comprising a cage-formed membrane shell (1) prefabricated from fine aggregate concrete, wherein the cage-formed membrane shell (1) is a hollow structure, serving as a permanent formwork and forming an integral load-bearing system with the post-cast concrete of the inner cavity; characterized in that: The inner wall of the cage mold shell (1) is provided with an inner rib structure; The side splicing contact surface of the cage mold shell (1) is provided with a deep embossed concave-convex structure (3). The middle of the wall thickness of the cage mold shell (1) is pre-embedded with continuous steel mesh (7). The precast substrate of the cage mold shell (1) is uniformly doped with modified tensile fibers and hot-melt fire-resistant fibers.

2. The inner-ribbed constructionally fireproofed cage modular monolithic vertical element according to claim 1, characterized in that: The inner rib structure is at least one of the following: a raised strip-shaped inner rib structure, a dot-shaped inner rib structure, and a recessed groove-shaped inner rib structure, used to form an interlocking connection with the post-poured concrete of the inner cavity.

3. The inner-ribbed constructionally fireproofed cage modular assembled monolithic vertical element according to claim 2, characterized by the fact that: When the inner rib structure is a raised strip-shaped inner rib structure (5), its raised height is 5-20mm and the spacing is 100-300mm; when the inner rib structure is a recessed groove-shaped inner rib structure (6), its recessed depth is 5-15mm and the spacing is 100-300mm.

4. The inner-ribbed constructionally fire-typed cage die-assembled monolithic vertical member according to any one of claims 1-3, characterized by the fact that: The deep embossed texture (3) is a continuous toothed, wavy, or rough surface, with a texture depth of 3-10 mm.

5. The inner-ribbed constructionally fireproofed cage modular monolithic vertical element according to any one of claims 1 to 3, characterized by the fact that: The steel mesh (7) is a wire mesh with a steel bar diameter of 4-6 mm and a mesh size of 50-100 mm.

6. The inner-ribbed constructionally fire-typed cage die-assembled monolithic vertical member according to any one of claims 1-3, characterized by the fact that: The modified tensile fiber is steel fiber, and its dosage is 0.3%-2.0% of the volume of the precast substrate.

7. The inner-ribbed constructionally fireproofed cage modular monolithic vertical element according to any of claims 1 to 3, characterized by the fact that: The hot-melt fire-resistant fiber is one or more of polypropylene fiber, polyester fiber, polyoxymethylene fiber or polyethylene fiber, with a melting point of 120-200℃, and the dosage is 0.5%-3.5% of the volume of the precast substrate.

8. The inner-ribbed constructionally fire-typed cage die-assembled monolithic vertical member according to any one of claims 1-3, characterized by the fact that: The wall thickness of the cage mold shell (1) is 20-50mm.

9. The inner-ribbed constructionally fireproofed cage modular monolithic vertical element according to any of claims 1-3, characterized in that: It also includes a steel cage (2), which is disposed in the cavity of the cage mold shell (1).

10. The inner-ribbed constructionally fireproofed cage modular monolithic vertical element according to any of claims 1-3, characterized in that: Pull holes (4) are provided on the cage mold shell (1).

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