Connecting structure between modularized lightweight concrete column members and construction method

Abstract

The invention relates to a connection structure between modularized lightweight concrete column members and a construction method, and belongs to the technical field of fabricated structures. Comprising two column components which are in butt joint up and down, and each column component is composed of an internal column framework and hollow or non-hollow lightweight concrete wrapping the internal column framework; the upper and lower end parts of the column framework are fixedly connected with connecting end plates; hand hole connecting grooves and corresponding hand hole connecting boxes are formed in eight corners of the column component; the upper end faces and the lower end faces of every two adjacent column components are in butt joint together to form a connecting joint gap, and rock wool boards are fixed in the connecting joint gaps. The adjacent connecting end plates and the rock wool plates clamped between the adjacent connecting end plates are assembled and fixed together through bolts and nuts, and the peripheries of the rock wool plates are sequentially filled with PU polystyrene foam and fireproof sealant. The invention has the characteristics of high standardization degree, light component weight, decoration-structure integration, full-dry connection of joints and the like, and is suitable for various building layer heights.

Description

Technical Field

[0001] This invention relates to a modular lightweight concrete column component connection structure and construction method, belonging to the field of prefabricated structure technology. Background Technology

[0002] In recent years, my country's railway construction has achieved remarkable success. According to statistics from China State Railway Group Co., Ltd., by the end of 2022, the total operating mileage of railways nationwide had reached 155,000 kilometers, of which the operating mileage of high-speed railways exceeded 40,000 kilometers, accounting for two-thirds of the world's total high-speed rail mileage. In 2022, the national railway fixed asset investment reached 710.9 billion yuan, and more than 4,100 kilometers of new railway lines were opened for operation. With the continuous expansion of the railway network and the improvement of transport capacity, the demand for supporting production and living facilities along railway lines is increasing daily. These facilities are characterized by small scale, scattered layout, inconvenient transportation, and scarce water and electricity resources.

[0003] Currently, railway station areas, work areas, and inter-station buildings are mostly constructed using cast-in-place reinforced concrete structures and steel structures. While cast-in-place concrete structures possess good durability, fire resistance, and overall stability, their construction efficiency is low, and the construction cycle is long. In cases of rapid growth in railway construction demand or occasional emergencies, cast-in-place concrete structures are difficult to complete and put into operation in a short time, and the construction process generates large amounts of dust, wastewater, and other pollutants, causing a certain negative impact on the environment. Although steel structures offer faster construction speeds and can quickly respond to railway construction needs, their poor fire and corrosion resistance requires additional anti-corrosion and fireproofing treatments, resulting in higher maintenance costs throughout the structure's lifespan. Furthermore, both construction methods are highly dependent on water and electricity resources and large machinery. Due to the small scale and dispersed layout of these buildings, construction costs remain high.

[0004] Prefabricated construction refers to transferring a large amount of on-site work from traditional construction methods to factories. Building components and accessories are prefabricated in factories, transported to the construction site, and assembled on-site using reliable connection methods. This method effectively improves building quality and efficiency, saves energy and resources, and reduces environmental pollution. In recent years, my country has vigorously promoted the development of prefabricated buildings, resulting in many mature technologies that have been widely applied in actual projects. However, the main application scenarios are high-rise buildings, with relatively little research and application of prefabricated building technologies for mid- and low-rise buildings. Based on the actual needs of railway housing and the development of existing prefabricated concrete technology, prefabricated concrete buildings based on fully dry connections are highly compatible with railway housing construction. The fully dry connection method avoids the complexity and environmental dependence of traditional wet joints during construction, further improving assembly speed and construction quality. Through fully dry connections, prefabricated concrete buildings can achieve a fast and efficient installation process, meeting the needs of the rapid development of railway construction and providing convenience for the subsequent maintenance of railway housing. However, existing prefabricated concrete technology results in heavy components, making transportation extremely difficult in areas with poor transport conditions within the same section. The high transportation costs will significantly increase the cost of building construction.

[0005] In summary, current prefabricated buildings generally suffer from various problems, such as reliance on water, electricity, and large machinery during construction, low standardization of components, high transportation costs, and poor corrosion resistance and fire resistance. Therefore, it is necessary to explore a new type of modular lightweight concrete building unit.

[0006] In summary, current prefabricated buildings generally suffer from various problems, such as reliance on water, electricity, and large machinery during construction, low standardization of components, high transportation costs, and poor corrosion resistance and fire resistance. Therefore, it is necessary to explore a new type of modular lightweight concrete column component connection structure and construction method. Summary of the Invention

[0007] To address the aforementioned deficiencies in the existing technologies, this invention proposes a modular lightweight concrete column component connection structure and construction method, which solves the problems commonly found in existing prefabricated buildings, such as inconvenient assembly and disassembly, inability to adjust according to building functions, inability to achieve modular standardization, high transportation costs, and poor corrosion resistance and fire resistance.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A modular lightweight concrete column connection structure includes two column members fixed together vertically, each column member consisting of an internal column frame and lightweight concrete enclosing it. The column frame consists of four rectangularly arranged vertical chord members, with adjacent vertical chord members facing each other. Rectangular end-connecting devices are provided on the inner sides of both ends of each vertical chord member, thus fixing the upper and lower ends of the four vertical chord members together. Simultaneously, web members are fixedly installed between adjacent vertical chord members, connecting the rectangularly arranged vertical chord members into a single unit. The end-connecting devices and web members are welded to the outer walls of the corner members of the vertical chord members. The upper and lower ends of the vertical chord members of the column frame are fixedly connected with connecting end plates; The column member has eight recessed corners forming lightweight concrete grooves, exposing the connecting end plate and the vertical chord of the column frame connected thereto. A handhole connection groove for bolt assembly is formed between the connecting end plate, the exposed vertical chord of the column frame, and the lightweight concrete groove. A handhole connection box is also correspondingly inserted into the handhole connection groove. The upper and lower ends of two adjacent column members are joined together to form a connection node gap, and a rock wool board is fixed in the connection node gap; the rock wool boards between adjacent connecting end plates and in the middle are all assembled and fixed together by bolts and nuts; the outer periphery of the rock wool board in the connection node gap is also filled with PU foam and fireproof sealant in sequence.

[0009] Furthermore, the adjacent sides of the connecting end plate are fixed to the vertical chord.

[0010] Furthermore, the handhole connection box uses a quick-drying inorganic fireproof sealant.

[0011] Furthermore, the cross-section of the handhole connecting box is L-shaped, stepped, or rectangular, for quick filling and matching with the handhole connecting groove.

[0012] Furthermore, the connecting end plate has a bolt hole in the middle for the bolt to pass through.

[0013] Furthermore, rows of shear studs are fixed on the vertical chord members of the column frame facing the inner side of the lightweight concrete. These studs are embedded in the lightweight concrete to provide shear resistance. The number and spacing of the studs on the inner side of the vertical chord members are calculated based on the shear strength.

[0014] Furthermore, a decorative layer is provided on the outer side of the column member; the column member is a solid or hollow structure. For hollow column members, fiberglass tubes, round steel tubes, and spiral stirrups are arranged in the hollow part to enhance the restraint effect and improve the compressive strength.

[0015] Furthermore, the specifications of the vertical chord members, web members, end connection devices of the column frame, and the dimensions of the connecting end plates are all obtained through strength calculations; wherein, the vertical chord members of the column frame are standard specification chord members.

[0016] Furthermore, the beam frame material can be aluminum alloy, steel, fiber composite material, etc.; for the chord members, it can be angle steel, angle aluminum, channel steel, channel aluminum, cold-formed thin-walled steel, basalt fiber composite profile, etc.; for the web members, it can be truss reinforcement, basalt reinforcement, cold-formed thin-walled steel, etc.

[0017] A construction method for a connection structure between modular lightweight concrete column members, used to form the aforementioned connection structure between modular lightweight concrete column members, includes the following steps: S1. Prefabricate the various components of the column frame in the factory and assemble them into a column frame; S2. Place and position the column frame in the modular lightweight concrete column formwork, and reserve the hand hole connection groove; S3. Pour lightweight concrete into the modular lightweight concrete beam formwork to form standardized column components, and then insulate and cure them. Finally, apply a decorative layer to the outside of the column components. S4. Set up a manhole connection box template, fill it with quick-drying inorganic fireproof sealant, and form a manhole connection box that matches the manhole connection groove; S5. Transport the lightweight concrete column components to the construction site, position and assemble the upper and lower lightweight concrete column components. A rock wool board is placed on top of one lightweight concrete column component, and then the other lightweight concrete column component is aligned to clamp the rock wool board. Next, at the manhole connection box location, bolts are inserted through the adjacent connection end plates and the rock wool board, and nuts are used for fixing. The manhole connection groove is then filled with an insert-type manhole connection box, thereby connecting and sealing the adjacent lightweight concrete column components. S6. Fireproofing and sealing treatment is carried out at the joint gap formed at the end faces of the upper and lower column components. After the joint is fixed, a ring of PU foam is applied around the rock wool board, and then a ring of fireproof sealant is applied around the PU foam. This fills the joint gap between the upper and lower column components into a whole, completing the connection between the modular lightweight concrete column components.

[0018] By adopting the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art: (1) Standardized components, adaptable to various building forms. This invention adopts standardized components + modular design. For example, a column component with a length of 800mm can be assembled into a house with a floor height of 3.2m by using four column components, or into a house with a span of 4.0m by using five beam components. Based on the flexible assembly of basic components, buildings of various shapes, spans and heights can be formed. The production mold amortization cost is low, and the production cost is low.

[0019] (2) No reliance on machinery and high construction efficiency. Several types of standardized components are composed of lightweight concrete and a skeleton. The interior of the lightweight concrete has a dense microporous structure, and its density is much higher than that of the lightweight aggregate concrete commonly used in the industry and academia. The weight reduction effect can reach more than 50%. In addition, by decomposing the entire span of beams and columns into multiple standardized size components, the weight of a single component is only at the level of hundreds of kilograms, which can be handled and installed manually. The construction process does not rely on machinery, and the all-dry node connection structure also greatly improves the construction efficiency.

[0020] (3) Integrated decoration and structure, less on-site work, and better user experience. During the production stage, the components can be integrated with external insulation and decoration according to needs, which can significantly shorten the on-site construction time, improve the overall construction efficiency, eliminate the waste of decoration materials, and ensure that the railway houses can be put into use quickly, which meets the requirements of green building and sustainable development. At the same time, thanks to the lightweight concrete used in the basic components, the structural components themselves also have good corrosion resistance and fire resistance.

[0021] (4) The lightweight concrete prefabricated structure system of the present invention, due to its advantages such as lightweight components, fully dry construction, and guaranteed corrosion and fire resistance, can effectively solve the practical problems of railway housing, such as high requirements for construction speed, difficulty in transporting building materials and components, and high difficulty in subsequent enclosure. Promoting the fully prefabricated lightweight concrete building technology based on modular lightweight components and using a fully dry construction process to railway housing construction is of great significance. The implementation of this project has good economic and social benefits.

[0022] (5) Based on the fully dry connection structure, the present invention can be extended to temporary buildings, and the building form can be flexibly adjusted according to the usage requirements. It is efficient in installation and dismantling, and solves the problems of poor user experience, high maintenance cost, low turnover and difficulty in adjusting the building form of temporary buildings such as container houses. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first type of column component of the present invention; Figure 2 This is a schematic diagram of the column frame connection in the first type of column component of the present invention; Figure 3 This is a schematic diagram of the web member in the first type of column component of the present invention; Figure 4 This is a schematic diagram of the connection between the first type of column components of the present invention; Figure 5 yes Figure 4 Enlarged exploded view of the connection parts of the column components; Figure 6 This is a schematic diagram of the handhole connection box in the first type of column component of the present invention; Figure 7 This is a schematic diagram of the column frame connection in the second type of column component of the present invention; Figure 8 This is a schematic diagram of the overall structure of the column component of the third type of hollow structure of the present invention. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-8 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0025] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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, they should not be construed as limiting this invention.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1 As attached Figure 1-2 As shown, a modular lightweight concrete column connection structure of this embodiment includes two solid column members 100 that are fixed together vertically. Each column member 100 is composed of an internal column frame 101 and lightweight concrete 7 enclosing it.

[0028] like Figure 2 As shown, the column frame 101 consists of four rectangularly arranged vertical chord members 1011, with adjacent vertical chord members 1011 facing each other. Rectangular column frame end connecting devices 1012 are provided on the inner sides of both ends of each vertical chord member 1011. In this embodiment, these are column frame end stirrups, but they can also be steel sheets or angle steel, thereby fixing the upper and lower ends of the four vertical chord members 1011 together. Simultaneously, web members 23 are also fixedly installed between adjacent vertical chord members 1011, such as... Figure 3 As shown, this connects the rectangularly arranged vertical chord members 1011 of the column frame into a single unit. The column frame end connecting device 1012 and the web member 23 are both welded to the outer wall of the corner members of the vertical chord members 1011 of the column frame.

[0029] like Figure 2 As shown, the upper and lower ends of the vertical chord member 1011 of the column frame are fixedly connected to connecting end plates 24. The adjacent sides of the connecting end plates 24 are fixed to the L-shaped corner members of the vertical chord member 21, and a triangular reinforcing rib 25 is welded between the third side of the connecting end plates 24 and the vertical chord member 21. A bolt hole for the bolt 4 to pass through is provided in the middle of the connecting end plates 24. Furthermore, rows of shear studs 6 are fixed on the L-shaped corner members of the vertical chord member 1011 of the column frame, facing inwards towards the lightweight concrete. These studs are embedded in the lightweight concrete 7 and serve a shear-resistant function. There are nine studs 6 on the inner side of the vertical chord member 21, and their number and spacing are calculated based on shear strength. In this embodiment, the vertical chord member of the column frame is angle steel, but it can also be channel steel, thin-walled steel, square steel pipe, basalt fiber composite profile, etc.; the beam web members are truss reinforcement, but they can also be reinforcing bars, basalt reinforcement, cold-formed thin-walled steel, etc.

[0030] The outer side of the column member 100 is provided with a decorative layer, such as... Figure 4-5 As shown, its eight corners are recessed to form lightweight concrete grooves, exposing the connecting end plate 24 and the vertical chord members 1011 of the column frame connected thereto. A handhole connection groove 3 for bolt 4 assembly is formed between the connecting end plate 24, the exposed vertical chord members 1011 of the column frame, and the lightweight concrete grooves. A handhole connection box 11 is correspondingly inserted into the handhole connection groove 3. The handhole connection box 11 uses quick-drying inorganic fireproof sealant. Figure 6 As shown, the cross-section of the handhole connection box 11 is L-shaped and stepped, which is used for quick filling and matching with the handhole connection groove 3.

[0031] like Figure 4-5 As shown, the upper and lower ends of two adjacent column members 100 are joined together to form a connection node gap. Adjacent connecting end plates 24 are assembled and fixed together by bolts 4 and nuts 5 in the handhole connecting groove 3.

[0032] In this embodiment, the specifications of the vertical chord 1011 of the column frame, the web members 23, the end connecting devices 1012 of the column frame, and the dimensions of the connecting end plates 24 are all obtained through strength calculations. The web members 23 and the end connecting devices 1012 of the column frame are both made of HRB500 steel bars with a diameter of 12mm. The standardized cross-sectional dimensions of the column member 100 can be: width × length × height = 300mm × 300mm × 800mm, 300mm × 300mm × 1000mm, 400mm × 400mm × 800mm, etc., facilitating rapid disassembly and reassembly by manual or mechanical means to create a new building for a new purpose.

[0033] Example 2 In this embodiment, an improvement upon Embodiment 1 is made. The upper and lower ends of two adjacent column members 100 are joined together to form a connection node gap, and a rock wool board 8 is fixed within the connection node gap. The rock wool boards between adjacent connecting end plates 24 and those sandwiched in the middle are assembled and fixed together by bolts 4 and nuts 5 provided in the handhole connecting groove 3. PU foam 9 and fireproof sealant 10 are sequentially provided around the outer periphery of the rock wool board 8 within the connection node gap. That is, PU foam 9 is provided around the outer periphery of the rock wool board 8 within the connection node gap, and fireproof sealant 10 is provided around the outer periphery of the PU foam 9, thereby fixing and composite-filling the connection node gap between the two adjacent column members 100 into a single unit. Other structures are the same as in Embodiment 1.

[0034] Example 3 like Figure 1 As shown in Figure 7, another modular lightweight concrete column member connection structure in this embodiment includes two column members 100 fixed together. Each column member 100 is composed of an internal column frame 101 and lightweight concrete 7 enclosing it. The column frame 101 is a rectangular perforated stiffened frame composed of a vertical chord 1011, a horizontal chord 10111, an end horizontal connecting chord 203, a diagonal brace 204 (i.e., a web member), and a horizontal connecting plate 10112. In this design, the ends of adjacent vertical chord members 1011 of the column frame are connected to form a rectangular three-dimensional frame via horizontal chord members 10111 and end horizontal connecting chord members 203. The middle of adjacent vertical chord members 1011 is fixed by a horizontal connecting plate 10112. An X-shaped diagonal brace 204 is also fixed between the horizontal connecting plate 10112 and the horizontal chord members 10111 of the column frame and adjacent vertical chord members 10111. The ends of the diagonal brace 204 are fixedly connected to the adjacent vertical chord members 1011. In addition, a conventional vertical connecting plate 10114 is provided on the inner side of each vertical chord member 1011. A connecting end plate 24 is also fixed on the inner side of the horizontal chord member 10111 between the vertical connecting plate 10114 and the vertical chord member 1011. The eight corners of the column member 100 are recessed to form lightweight concrete grooves, exposing the connecting end plate 24 and the vertical chord members 1011 of the column frame connected thereto. A handhole connecting groove 3 for bolt 4 assembly is formed between the connecting end plate 24, the exposed vertical chord members 1011 of the column frame, and the lightweight concrete grooves. Other structural connections and constructions are the same as in Embodiment 1, and will not be described in detail here.

[0035] Example 4 In this embodiment, as Figure 8 As shown, column member 100 is a hollow structure. For the hollow column member 100, fiberglass tubes, round steel tubes and spiral stirrups are arranged in the hollow part to enhance the restraint effect and improve the compressive strength.

[0036] Example 5 A construction method for the connection structure between modular lightweight concrete column members according to embodiments 1-4 above, which is used to form the connection structure between modular lightweight concrete column members in the above embodiments, includes the following steps: S1. The various components of the prefabricated column frame 101 are assembled into the column frame 101.

[0037] S2. Place and position the column frame 101 in the modular lightweight concrete column formwork, and reserve the hand hole connection groove 3.

[0038] S3. Lightweight concrete is poured into the modular lightweight concrete beam formwork to form a standardized column member 1, and then cured with heat insulation. Afterward, a decorative layer is applied to the outside of the column member 100.

[0039] S4. Set up the template for the handhole connection box 11, fill it with quick-drying inorganic fireproof sealant, and form a handhole connection box 11 that matches the handhole connection groove 3.

[0040] S5. Transport the lightweight concrete column components to the construction site, position and assemble the upper and lower lightweight concrete column components, with a rock wool board placed on top of one lightweight concrete column component, and then align the other lightweight concrete column component to clamp the rock wool board. Next, at the manhole connection box 11, bolts 4 are inserted through the adjacent connecting end plates 24 and the rock wool board, and secured with nuts 5. The manhole connection groove 3 is then filled with the insertion manhole connection box 11, thereby connecting and sealing the adjacent lightweight concrete column components.

[0041] S6. Fireproofing and sealing treatment is carried out at the connection node gap formed at the end faces of the upper and lower column components 100. After the butt joint is fixed, a ring of PU foam is applied around the rock wool board, and then a ring of fireproof sealant is applied around the PU foam. This fills the connection node gap between the upper and lower column components 100 into a whole, completing the connection between the modular lightweight concrete column components.

[0042] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the structure of the present invention. The arrangement and quantity of the present invention are not limited to this example and can be optimized according to actual engineering conditions. Any modifications, equivalent changes, and decorations made to the above embodiments based on the technical principles of the present invention, without departing from the scope of the present invention, are still within the scope of the present invention.

Claims

1. A modular lightweight concrete column connection structure, comprising two column members (100) fixed together vertically, characterized in that: Each of the column members (100) consists of an internal column frame (101) and lightweight concrete (7) enclosing it; The column frame (101) is composed of four rectangularly arranged vertical chord members (1011), with adjacent vertical chord members (1011) arranged opposite each other. Rectangular column frame end connecting devices (1012) are provided on the inner sides of both ends of the vertical chord members (1011), thereby fixing the upper and lower ends of the four vertical chord members (1011) together. At the same time, web members (23) are also fixedly provided between adjacent vertical chord members (1011), thereby connecting the rectangularly arranged vertical chord members (1011) into a whole. The column frame end connecting devices (1012) and the web members (23) are welded or bolted to the outer wall of the corner members of the vertical chord members (1011). The upper and lower ends of the vertical chord (1011) of the column frame are fixedly connected with connecting end plates (24). The eight corners of the column member (100) are recessed to form lightweight concrete grooves, exposing the connecting end plate (24) and the vertical chord members (1011) of the column skeleton connected thereto. A handhole connecting groove (3) for bolt (4) assembly is formed between the connecting end plate (24), the exposed vertical chord members (1011) of the column skeleton, and the lightweight concrete grooves. A handhole connecting box (11) is also correspondingly inserted into the handhole connecting groove (3). The upper and lower ends of two adjacent column members (100) are joined together to form a connection node gap, and a rock wool board is fixed in the connection node gap; the rock wool boards between adjacent connecting end plates (24) and the rock wool boards sandwiched in the middle are assembled and fixed together by bolts (4) and nuts (5); the outer periphery of the rock wool board in the connection node gap is also filled with PU foam and fireproof sealant in sequence.

2. The modular lightweight concrete column member connection structure according to claim 1, characterized in that: The connecting end plate (24) is fixed to the vertical chord (21) on two adjacent sides, and a triangular reinforcing rib (25) is welded between the third side of the connecting end plate (24) and the vertical chord (21).

3. The modular lightweight concrete column member connection structure according to claim 1, characterized in that: The handhole connection box (11) is made of quick-drying inorganic fireproof sealant.

4. The modular lightweight concrete column component connection structure according to claim 3, characterized in that: The cross-section of the handhole connecting box (11) is L-shaped, stepped, or rectangular, and is used to quickly fill and match the handhole connecting groove (3).

5. The modular lightweight concrete column connection structure according to claim 1, characterized in that: The connecting end plate (24) has a bolt hole in the middle for the bolt (4) to pass through.

6. The modular lightweight concrete column member connection structure according to claim 1, characterized in that: The vertical chord (1011) of the column frame is fixed with rows of shear studs (6) facing the inside of the lightweight concrete. These studs are embedded in the lightweight concrete (7) and serve to resist shear.

7. The modular lightweight concrete column member connection structure according to claim 6, characterized in that: The column member (100) may be provided with a decorative layer as required; the column member (100) may be solid or hollow. For hollow column members (100), fiberglass tubes, round steel tubes and spiral stirrups are arranged in the hollow part to enhance the restraint effect and improve the compressive strength.

8. The modular lightweight concrete column member connection structure according to claim 1, characterized in that: The column frame (101) is made of aluminum alloy, steel or fiber composite material.

9. A construction method for a modular lightweight concrete column component connection structure, used to form the modular lightweight concrete column component connection structure as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. The various components in the prefabricated column frame (101) are assembled into the column frame (101). S2. Place the column frame (101) into and position it in the modular lightweight concrete column formwork, and reserve the hand hole connection groove (3). S3. Lightweight concrete is poured into the modular lightweight concrete beam formwork to form a standardized column member (1), and then thermally cured. After that, a decorative layer is applied to the outside of the column member (100). S4. Set up a template for the handhole connection box (11), fill it with quick-drying inorganic fireproof sealant, and form a handhole connection box (11) that matches the handhole connection groove (3). S5. Transport the lightweight concrete column components to the construction site, position and assemble the upper and lower lightweight concrete column components, wherein a rock wool board is installed on the upper part of one lightweight concrete column component, and then the other lightweight concrete column component is aligned to clamp the rock wool board; then, at the handhole connection box (11) part, bolts (4) are inserted through the adjacent connection end plate (24) and the rock wool board, and nuts (5) are used to fix them, and the handhole connection box (11) is filled in the handhole connection groove (3) to connect and close the adjacent lightweight concrete column components; S6. Fireproofing and sealing treatment is carried out at the joint gap formed at the end faces of the upper and lower column members (100). After the joint is fixed, a ring of PU foam is applied around the rock wool board, and then a ring of fireproof sealant is applied around the PU foam to fill the joint gap between the upper and lower column members (100) into a whole, thus completing the connection between the modular lightweight concrete column members.

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