Floor slab assembly type steel structure

Abstract

The utility model discloses a floor slab assembly type steel structure which comprises a current floor slab provided with a hole. The fixing assembly is used for fixing the supporting assembly on a current floor slab; the supporting assembly is fixed to the current floor and used for supporting the plugging assembly; the plugging assembly is arranged at the hole and used for plugging the hole; the protection assembly is arranged on the plugging assembly; the sound insulation assembly is arranged below the hole; the fixing assembly comprises a fixing piece and a supporting piece, the fixing piece is fixed to the current floor, and the supporting piece is fixed to the current floor through the fixing piece; the supporting assembly comprises a connecting piece, and the connecting piece is connected with the supporting piece; the plugging assembly comprises a plugging plate, the plugging plate is arranged in the frame formed by the connecting pieces and protrudes out of the periphery of the hole, and the periphery of the plugging plate is caulked through a sealing material. According to the utility model, the space limitation can be broken through, the transformation efficiency is improved, a technical path with economical efficiency and reliability is provided for urban updating, the feasibility is strong, and the application and popularization are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of architectural design technology, and in particular to a prefabricated steel structure for floor slabs. Background Technology

[0002] With the continuous advancement of urban renewal, the number of existing building renovation projects is increasing, and the efficient sealing of floor openings has become an urgent problem to be solved. Traditional cast-in-place concrete technology has many drawbacks, such as relying on wet work, requiring ample space and a long curing period of 28 days, making it difficult to apply in water-controlled areas or when the construction period is tight. In addition, it has a large additional load and a high risk of leakage at joints, which seriously affects the efficiency of renovation and building safety. Utility Model Content

[0003] The purpose of this utility model is to provide a prefabricated steel structure for floor slabs, thereby solving the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A prefabricated steel structure for floor slabs, comprising:

[0006] The existing floor slab has an opening in it;

[0007] Fixing components are used to secure the support components to the existing floor slab.

[0008] Support components, fixed to the existing floor slab, are used to support the sealing components;

[0009] A sealing component, installed at the opening, is used to seal the opening;

[0010] A protective component, installed on the sealing component, is used to protect the sealing component;

[0011] Sound insulation components are installed below the opening to block sound transmission;

[0012] The fixing components include fasteners and supports. The fasteners are fixed to the existing floor slab, and the supports are fixed to the existing floor slab through the fasteners.

[0013] The support assembly includes connectors, which are connected to the support assembly;

[0014] The sealing assembly includes a sealing plate, which is set within the frame formed by the connector and protrudes around the opening. The sealing plate is sealed with sealant around its perimeter.

[0015] The protective components include fire-resistant material, waterproof material, protective layer, and extended waterproof material. The fire-resistant material is applied around the sealing plate and on the surface of the metal components, and the waterproof material is laid on top of the sealing plate. The protective layer is placed on top of the waterproof material, and the extended waterproof material is applied to the outside of the protective layer.

[0016] The sound insulation components include a keel, joint filler, sound insulation filling material, and double-layer panels. The keel is fixed to the side wall below the opening. The joint filler fills the gap between the keel and the side wall. The sound insulation filling material is filled inside the keel. The double-layer panels are fixed to the keel.

[0017] In some specific embodiments, the fastener is an anchor bolt with a spacing of 300mm, and the anchor bolt is fixed to the existing floor slab.

[0018] The supporting component is angle steel, which is fixed to the existing floor slab by anchor bolts.

[0019] In some specific embodiments, the connector is a channel steel, which is welded and fixed to the angle steel.

[0020] In some specific embodiments, the sealing plate is a steel plate with a thickness of ≥10mm. The steel plate is arranged along the short side within the frame formed by the channel steel, and the steel plate protrudes ≥200mm around the opening. The steel plate is sealed with sealant around its perimeter.

[0021] In some specific embodiments, the fireproof material is a fireproof coating with a fire resistance rating of ≥1.5h, which is applied around the steel plate and on the surface of the steel components.

[0022] In some specific embodiments, the waterproof material is a waterproof membrane with an outer overlap of ≥500mm, which is fixed with cement nails and sealed with sealant around the perimeter.

[0023] In some specific embodiments, the protective layer is a cement mortar protective layer with a thickness of 30mm and an embedded wire mesh.

[0024] In some specific embodiments, the extended waterproofing material is a waterproof coating, which is applied to the cement mortar protective layer for ≥1000mm.

[0025] In some specific embodiments, the keel is a light steel keel, which is fixed to the side wall below the opening by expansion bolts.

[0026] In some specific embodiments, the caulking material is an elastic strip, which is used to fill the gap between the light steel keel and the side wall;

[0027] The sound insulation filling material is glass wool, which is filled inside the light steel keel;

[0028] The double-layer panel is a double-layer paper-faced gypsum board with a thickness of ≥12mm. It is fixed to both sides of the light steel keel with self-tapping screws and the seams are sealed with sealant around the edges.

[0029] The beneficial effects of this utility model are as follows: This utility model discloses a prefabricated steel structure for floor slabs, including an existing floor slab with an opening; a fixing component for fixing a support component to the existing floor slab; a support component fixed to the existing floor slab for supporting a sealing component; a sealing component disposed at the opening for sealing the opening; a protective component disposed on the sealing component for protecting the sealing component; and a sound insulation component disposed below the opening for isolating sound transmission. The fixing component includes a fixing member and a support member, the fixing member being fixed to the existing floor slab, and the support member being fixed to the existing floor slab through the fixing member. The support component includes a connector, the connector being connected to the support member. The sealing component includes a sealing plate, the sealing plate being disposed within the frame formed by the connector, and the sealing plate protruding around the opening, with the sealing plate sealed around its perimeter with a sealing material. This utility model adopts a composite structure of "steel frame support - rock wool fireproof and sound insulation - elastic sealing", taking into account the fixing measures during structural construction and the sealing measures after construction. Compared with traditional technology, the construction cycle is shortened by 80%, the structural thickness is reduced by 40%, and the problems of dynamic water tightness and vibration adaptation are systematically solved. Engineering demonstrations have shown that this system can overcome spatial limitations, improve renovation efficiency, and provide an economical and reliable technical path for urban renewal. It is highly feasible and easy to apply and promote. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a prefabricated steel structure for floor slabs according to this utility model.

[0031] In the attached diagram: 1. Existing floor slab; 2. Angle steel; 3. Anchor bolts; 4. Channel steel; 5. Steel plate; 6. Fireproof coating; 7. Waterproof membrane; 8. Cement mortar protective layer; 9. Sealant; 10. Waterproof coating.

[0032] 11. Sealant; 12. Cement nails; 13. Expansion bolts; 14. Light steel keel; 15. Elastic strips; 16. Glass wool; 17. Double-layer paper-faced gypsum board; 18. Finished surface layer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0034] Reference Figure 1 The floor slab prefabricated steel structure shown includes:

[0035] The existing floor slab 1 has an opening in it.

[0036] Existing floor slab 1 serves as the foundation carrier for the entire prefabricated steel structure and is itself a floor slab in the existing building that requires the sealing and modification of openings. It provides a foundation support surface for the installation of subsequent fixing components, supporting components, and all other components. Existing floor slab 1 bears the weight and other forces of the entire prefabricated steel structure system and transmits these forces to the main building structure, maintaining the stability of the structure.

[0037] Fixing components are used to fix the support components to the existing floor slab 1;

[0038] Support components are fixed to the existing floor slab 1 to support the sealing components;

[0039] A sealing component, installed at the opening, is used to seal the opening;

[0040] A protective component, installed on the sealing component, is used to protect the sealing component;

[0041] Sound insulation components are installed below the opening to block sound transmission;

[0042] The fixing components include fasteners and supports. The fasteners are fixed to the existing floor slab 1, and the supports are fixed to the existing floor slab 1 through the fasteners.

[0043] The support assembly includes connectors, which are connected to the support assembly;

[0044] The sealing assembly includes a sealing plate, which is set within the frame formed by the connector and protrudes around the opening. The sealing plate is sealed with sealant around its perimeter.

[0045] The protective components include fire-resistant material, waterproof material, protective layer, and extended waterproof material. The fire-resistant material is applied around the sealing plate and on the surface of the metal components, and the waterproof material is laid on top of the sealing plate. The protective layer is placed on top of the waterproof material, and the extended waterproof material is applied to the outside of the protective layer.

[0046] The sound insulation components include a keel, joint filler, sound insulation filling material, and double-layer panels. The keel is fixed to the side wall below the opening. The joint filler fills the gap between the keel and the side wall. The sound insulation filling material is filled inside the keel. The double-layer panels are fixed to the keel.

[0047] In some specific embodiments, the fixing element is an anchor bolt 3, with a spacing of 300mm. The anchor bolt 3 is fixed to the existing floor slab 1. One end of the anchor bolt 3 is anchored to the existing floor slab 1, and the other end is connected to the angle steel 2, serving as a connection and fixation function. The fixing element firmly fixes the support to the existing floor slab, ensuring the stability of the support assembly and providing a reliable connection foundation for the entire prefabricated steel structure.

[0048] The supporting component is angle steel 2, which is fixed to the existing floor slab 1 by anchor bolts 3.

[0049] Anchor bolt installation: First, drill holes in the existing floor slab 1 at 300mm intervals, then insert the anchor bolts 3 into the holes and fix them in the floor slab by means of anchoring agent or mechanical interlocking, so that the bolt part of the anchor bolt protrudes from the surface of the floor slab.

[0050] Angle steel connection: Align the reserved hole on angle steel 2 with the bolt part of anchor bolt 3, put it in and press it down along the bolt to make the angle steel fit tightly with the existing floor slab. Then tighten the nut on the bolt part of the anchor bolt to fix angle steel 2 to the anchor bolt.

[0051] Installation location

[0052] Relative to the existing floor slab: Located on the upper surface of the existing floor slab 1, and arranged around the perimeter of the opening, forming a stable support frame around the opening. The distance from the edge of the opening is determined according to the size of the sealing components and the stress requirements, and generally does not exceed 300mm.

[0053] Compared to anchor bolts: Anchor bolt 3 is fixed to the existing floor slab 1, with its bolt portion protruding from the floor slab surface. Angle steel 2 fits onto the bolt portion of the anchor bolt through its own hole and is tightened with a nut. The long side of the angle steel generally extends along the edge of the hole, while the short side is connected to the anchor bolt.

[0054] Effects

[0055] Provide stable support: Angle steel 2 is firmly fixed to the existing floor slab 1 by anchor bolts 3, providing a stable support foundation for the supporting components above (such as channel steel 4, etc.), ensuring the stability and load-bearing capacity of the entire sealing structure, and effectively supporting the weight of sealing components, protective components, etc., as well as other loads that may be subjected to, such as personnel activities, equipment placement, etc.

[0056] Distributing loads: Since the anchor bolts 3 are arranged at a certain interval (300mm), the angle steel 2 continuously connects multiple anchor bolts to form a continuous support system, which can evenly distribute the load of the sealing structure to a large area of ​​the existing floor slab 1, avoid excessive local loads that could damage the floor slab, and improve the safety and reliability of the entire structure.

[0057] Facilitating subsequent installation: The upper surface of angle steel 2 provides a flat and stable welding or connection base for subsequent installation connectors (such as channel steel 4), facilitating the installation and fixing of subsequent support components and ensuring the installation accuracy and efficiency of the entire prefabricated steel structure. At the same time, its regular shape and uniform spacing also facilitate the arrangement and installation of subsequent components, making the assembly of the entire structure more orderly and efficient.

[0058] In some specific embodiments, the connecting member is a channel steel 4, which is welded and fixed to the angle steel 2.

[0059] It should be noted that the channel steel 4 and the angle steel 2 are connected to form a frame structure to support the sealing plate 5. This frame constitutes the support frame of the sealing assembly, ensuring that the sealing plate can be stably installed at the opening and that the load on the sealing plate is evenly transferred to the angle steel 2.

[0060] In some specific embodiments, the sealing plate is a steel plate 5 with a thickness of ≥10mm. The steel plate 5 is arranged along the short side within the frame formed by the channel steel 4, and the steel plate 5 protrudes ≥200mm around the opening. The steel plate 5 is sealed with sealant 9 around its perimeter.

[0061] The steel plate 5 is placed within the channel steel 4 frame and sealed to the surrounding structure using sealant 9 around its perimeter. The steel plate 5 directly seals the openings in the existing floor slab 1, preventing gases, liquids, and other substances from penetrating through the openings, ensuring the integrity and flatness of the floor slab, and providing a foundation for the subsequent installation of protective and sound insulation components.

[0062] In some specific embodiments, the fireproof material is fireproof coating 6, which has a fire resistance rating of ≥1.5h and is applied to the perimeter of the steel plate 5 and the surface of the steel components.

[0063] Fire-retardant coating 6 adheres directly to the surface of steel plates and steel components, forming a fire-resistant protective layer.

[0064] In the event of a fire, it can effectively delay or prevent the spread of fire on the surface of the steel structure, improve the fire resistance of the steel structure, ensure that the entire prefabricated steel structure maintains structural stability for a certain period of time, and reduce the damage caused by fire to the building.

[0065] In some specific embodiments, the waterproof material is a waterproof membrane 7, with an outer overlap of ≥500mm, which is fixed by cement nails 12 and sealed with sealant 11 around the perimeter.

[0066] The waterproof membrane 7 is fixed to the steel plate 5 with cement nails 12, and the four sides are sealed with sealant 11 to form a waterproof whole with the steel plate and the surrounding structure.

[0067] Waterproof membrane 7 can prevent moisture from seeping from the top of the floor slab to the bottom, protecting the floor slab and the space below from moisture erosion, extending the service life of the building structure, and providing a waterproof base for subsequent protective layers and extended waterproofing materials.

[0068] In some specific embodiments, the protective layer is a cement mortar protective layer 8 with a thickness of 30mm and an embedded wire mesh.

[0069] A cement mortar protective layer 8 is applied above the waterproof membrane 7. Cement mortar is applied to the waterproof membrane 7 to form a 30mm thick protective layer with embedded wire mesh, which is tightly bonded to the waterproof membrane.

[0070] Waterproof membrane 7 can protect the waterproof membrane from external mechanical damage and environmental factors, such as people stepping on it or placing objects on it. At the same time, the embedded wire mesh enhances the integrity and crack resistance of the protective layer, further improving the reliability of the waterproof system.

[0071] In some specific embodiments, the extended waterproofing material is waterproof coating 10, which is applied to a depth of ≥1000mm beyond the cement mortar protective layer 8, and the surface finishing layer 18 is laid normally.

[0072] The waterproof coating 10 is applied from the edge of the cement mortar protective layer 8 outwards, forming a seamless waterproof system with the protective layer and the finishing layer 18.

[0073] Waterproof coating 10 extends the waterproofing range to the surrounding area, forming a wider waterproof barrier, effectively preventing moisture leakage on the floor surface and surrounding area, ensuring the waterproofing effect of the entire floor area, and providing a dry environment for the construction and use of the finishing layer.

[0074] In some specific embodiments, the keel is a light steel keel 14, which is fixed to the side wall below the opening by expansion bolts 13.

[0075] One end of the expansion bolt 13 is anchored to the side wall below the opening, and the other end is connected to the light steel keel 14. The elastic strip 15 fills the gap between the light steel keel 14 and the side wall to ensure the tightness and stability of the connection.

[0076] The expansion bolt 13 serves as the supporting frame for the sound insulation component, providing an installation base for the sound insulation filling material and double-layer panel. At the same time, through its own structure and in conjunction with the joint filling material, it initially plays a sound insulation role, blocking the transmission of sound between the floor opening and the side wall.

[0077] In some specific embodiments, the caulking material is an elastic strip 15, which caulks the gap between the light steel keel 14 and the side wall;

[0078] It fills the gap between the light steel keel 14 and the side wall, making close contact with both to seal and fill the gap.

[0079] The gaps between the light steel keel 14 and the side wall are sealed to prevent sound from propagating through the gaps, thereby enhancing the overall sound insulation effect of the sound insulation components. At the same time, the elastic properties of the elastic strip can also play a certain role in shock absorption, reducing the solid-borne transmission of sound.

[0080] The sound insulation filling material is glass wool 16, which is filled inside the light steel keel 14;

[0081] It fills the cavity formed by the light steel keel 14, and is tightly integrated with the light steel keel, filling the entire cavity.

[0082] Light steel keel 14 utilizes the porosity and fiber structure of glass wool to absorb and attenuate sound, effectively blocking sound transmission below floor openings, improving the sound insulation performance of the entire prefabricated steel structure, and creating a quiet indoor building environment.

[0083] The double-layer panel is a double-layer paper-faced gypsum board 17 with a thickness of ≥12mm. It is fixed to both sides of the light steel keel 14 with self-tapping screws and the seams are filled with sealant 9 around the perimeter.

[0084] Self-tapping screws are inserted through double-layered gypsum board 17 and fixed to light steel keel 14. The edges are sealed with sealant 9, forming a whole with light steel keel and sealant.

[0085] Double-layer gypsum board 17 serves as the outer protective layer and sound barrier of the sound insulation component, further blocking the transmission of sound. The double-layer structure and the caulking treatment with sealant can effectively reduce sound penetration. At the same time, the gypsum board also has a certain decorative function, so that the entire prefabricated steel structure of the floor slab has good aesthetics while meeting functional requirements.

[0086] The working method of this utility model

[0087] The main steps are as follows:

[0088] Positioning and layout: Based on the architectural drawings and actual site conditions, determine the location and size of the opening on the existing floor slab, and mark the installation positions of the fixing components, including the anchor bolt placement points. The spacing between adjacent anchor bolts should be controlled at about 300mm, and they should be evenly distributed around the opening.

[0089] Drilling and Anchor Bolt Installation: Using professional drilling equipment, drill holes at the marked installation points on the existing floor slab according to the anchor bolt specifications. The hole depth must meet the anchorage length requirements of the anchor bolt. Insert the anchor bolt into the hole and fix it in the floor slab using anchoring agent or mechanical anchoring methods, ensuring that the verticality of the anchor bolt and the height protruding from the floor slab meet the design requirements.

[0090] Angle steel fixing: Pre-process the angle steel to the size suitable for the shape of the opening, and drill holes in the angle steel according to the spacing and position of the anchor bolts. Place the angle steel on top of the anchor bolts, align the holes on the angle steel with the anchor bolts, put on the nuts and tighten them, so that the angle steel fits tightly against the existing floor slab surface, forming a stable fixing frame around the opening.

[0091] Channel steel installation: According to the dimensions and positions required by the design, the channel steel and angle steel are welded and fixed. First, the welding points of the channel steel are determined on the angle steel, and spot welding is generally carried out every 300-500mm. Then, full welding is performed to ensure that the channel steel and angle steel form a firm connection and constitute the supporting frame of the sealing component.

[0092] Steel plate sealing: Cut steel plates with a thickness of ≥10mm to a size that matches the channel steel frame, and place them along the short side within the frame formed by the channel steel, ensuring that the steel plate protrudes ≥200mm around the opening. Use sealant to fill the gaps around the steel plate where it contacts the existing floor slab and channel steel to ensure a tight seal and prevent gas and liquid from penetrating through the opening.

[0093] Construction of protective components: First, apply a fire-retardant coating with a fire resistance rating of ≥1.5h evenly around the steel plate and on the surfaces of steel components such as angle steel and channel steel. The coating thickness must meet the fire protection design requirements. Next, lay a waterproof membrane with an overlap of ≥500mm on top of the steel plate, fix it with cement nails, and seal the edges with sealant to ensure waterproofing. Then, construct a 30mm thick cement mortar protective layer on top of the waterproof membrane, embedding wire mesh to enhance the integrity and crack resistance of the protective layer. Finally, apply the waterproof coating as an extension waterproofing material, extending it ≥1000mm beyond the cement mortar protective layer to form a complete waterproof system.

[0094] Sound insulation component installation: Secure the light steel keel to the side wall below the opening using expansion bolts. The spacing between the light steel keels is generally 400-600mm, arranged vertically. Fill the gaps between the light steel keel and the side wall with elastic strips, ensuring a tight seal to block sound transmission channels. Fill the light steel keel with glass wool as a sound insulation material, ensuring the glass wool completely fills the keel cavity without being compressed or deformed, to fully utilize its sound absorption and insulation performance. Finally, fix double-layered gypsum board (thickness ≥12mm) to both sides of the light steel keel using self-tapping screws, with the screw spacing controlled at approximately 150-200mm. Seal the edges with sealant to form a complete sound barrier.

[0095] Example 1

[0096] In a renovation project of an old residential community, several openings in the floor slabs of a residential building needed to be sealed. The original building floor slabs were cast-in-place reinforced concrete slabs, and the openings were reserved for the previous installation of equipment. Now that the equipment has been removed, the openings need to be sealed. The dimensions of the openings are approximately 800mm × 1000mm.

[0097] Follow the above procedures:

[0098] Positioning and layout: Based on the architectural drawings and on-site verification, the construction personnel accurately marked the location of the opening on the floor slab, and determined the installation points of the anchor bolts around the opening, with the spacing between adjacent anchor bolts set at 300mm.

[0099] Drilling and anchor bolt installation: Use an electric hammer to drill holes in the floor slab according to the markings. After the hole depth reaches the anchor bolt anchoring requirements, install M12×150mm anchor bolts. The length of the anchor bolt protruding from the floor slab surface is about 50mm, and ensure that its verticality deviation is within 5%.

[0100] Angle steel fixing: Select 50×50×5mm angle steel, cut it to a length suitable for the shape of the opening, and drill holes in the angle steel to correspond with the anchor bolts. Place the angle steel on the anchor bolts, put on the nuts and tighten them, so that the angle steel is tightly attached to the floor slab, forming a stable fixing frame.

[0101] Channel steel installation: 50×38×4mm channel steel is used and welded to angle steel. The channel steel is spot-welded to the angle steel every 400mm, and then full welding is performed, with a weld height of not less than 6mm, to ensure that the channel steel and angle steel are firmly connected and form a sealing frame.

[0102] Steel plate sealing: Cut a 12mm thick steel plate to match the dimensions of the channel steel frame, place it inside the channel steel, and protrude 250mm around the opening. Apply sealant to the gaps around the steel plate, floor slab, and channel steel, with a width of approximately 10mm and a depth of approximately 15mm, ensuring a tight seal.

[0103] Construction of protective components: First, apply fire-retardant paint to a thickness of 3mm, ensuring even coverage around the steel plate and on the surface of the steel components. Next, lay modified bitumen waterproof membrane, overlapping 550mm, and fix it with cement nails at 250mm intervals, sealing the perimeter with sealant. Then, construct a 30mm thick cement mortar protective layer, embedding 1.0×1.0mm wire mesh. Finally, apply waterproof coating as an extended waterproofing material, extending the coating width 1200mm beyond the cement mortar protective layer.

[0104] Sound insulation component installation: Secure the light steel keel to the side wall below the opening using M6×60mm expansion bolts, spaced 500mm apart. Fill with polyethylene foam strips as elastic strips, ensuring a tight seal. Fill with 48kg / m³ of foam. 3 The glass wool is placed inside the keel, ensuring it is full and does not deform under pressure. Finally, two layers of 15mm thick paper-faced gypsum board are fixed to both sides of the keel with self-tapping screws spaced 180mm apart, and sealant is applied to fill the gaps, completing the installation of the sound insulation components.

[0105] After on-site testing, the sealed floor slab structure was found to be stable with no leakage, good sound insulation, and a quiet indoor environment, meeting the usage requirements after the renovation of the old community. This effectively improved the quality of life for residents, and the entire construction process was shortened by nearly 20 days compared to the traditional cast-in-place concrete sealing method.

[0106] Example 2

[0107] When a commercial complex is adjusting its indoor functional areas, it needs to seal off multiple ventilation openings on the multi-story floor slabs. The openings vary in size, with the largest being approximately 1200mm × 1500mm and the smallest approximately 400mm × 500mm. The existing floor slabs are precast hollow slabs.

[0108] The above working method is adopted:

[0109] Positioning and layout: Based on the adjustment plan drawings of the commercial complex, accurately locate the position and size of the openings on each floor slab, and determine the installation position of the anchor bolts. For large openings, the anchor bolt spacing is strictly controlled at 300mm, while for small openings, the anchor bolt spacing is adjusted appropriately, but not exceeding 400mm, to ensure that the anchor bolts are evenly distributed around the openings.

[0110] Drilling and Anchor Bolt Installation: For precast hollow core slab floor structures, a professional core drilling machine is used to drill holes to avoid damaging the floor slab. M10×120mm anchor bolts are installed, with approximately 40mm protruding from the floor slab, ensuring that the verticality deviation does not exceed 3% to guarantee the anchor bolt's anchoring effect.

[0111] Angle steel fixing: Select 45×45×4mm angle steel, cut it to the appropriate length according to the shape of the opening, and drill holes to correspond with the anchor bolts. Put the angle steel onto the anchor bolts, tighten the nuts, and make the angle steel fit tightly against the floor slab surface to form a stable fixing frame, which can reliably fix openings of different sizes.

[0112] Channel steel installation: 40×30×3mm channel steel is welded to angle steel. For large openings, the channel steel is spot-welded to the angle steel every 350mm, followed by full welding, with a weld height of not less than 5mm; for small openings, the welding spacing is adjusted appropriately to ensure a firm connection between the channel steel and angle steel, forming a sealing frame that adapts to different opening sizes.

[0113] Steel plate sealing: For large openings, use 14mm thick steel plates cut to match the dimensions of the channel steel frame, place them inside the channel steel, and protrude 220mm around the opening; for small openings, use 10mm thick steel plates, protruding 200mm around the opening. Sealant is applied around the steel plates to a width of approximately 8mm and a depth of approximately 12mm to ensure a tight seal.

[0114] Construction of protective components: Apply CQW-H tunnel concrete fireproof coating, 2.5mm thick, evenly covering the steel plate and steel components. Lay modified bitumen waterproof membrane, overlapping 500mm, fixed with cement nails at 200mm intervals, and seal the perimeter with sealant. Apply a 30mm thick cement mortar protective layer, embedding 0.8×0.8mm wire mesh. Finally, apply polyurethane waterproof coating as an extended waterproofing material, extending 1000mm beyond the cement mortar protective layer.

[0115] Sound insulation component installation: Fix the light steel keel to the lower side wall of the opening using M5×50mm expansion bolts, spaced 400mm apart. Fill with foamed polyethylene elastic strips, ensuring a tight seal. Fill with 60kg / m³ of foamed polyethylene. 3 The glass wool is placed inside the keel, ensuring it is full and does not deform under pressure. Double layers of 12mm thick paper-faced gypsum board are fixed to both sides of the keel with self-tapping screws spaced 150mm apart. Sealant is then applied to fill the gaps, completing the installation of the sound insulation components.

[0116] After the commercial complex was adjusted, the sealed openings underwent rigorous acceptance testing. The structure was stable, with no leakage, and the sound insulation met the design standards, providing a good building environment for the normal operation of the commercial complex. At the same time, the construction process did not interfere with other areas of the commercial complex, effectively ensuring the project's progress.

[0117] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0118] Prefabricated design: The floor slab sealing structure is decomposed into multiple prefabricated components, such as fixing components, support components, and sealing components. These components can be prefabricated in the factory and only need to be assembled and installed on site, which greatly reduces on-site wet work and avoids the problems of long curing period (28 days) in traditional cast-in-place concrete process. It effectively shortens the construction period and is especially suitable for existing building renovation projects in urban renewal. It can quickly complete the sealing of floor slab openings and improve renovation efficiency.

[0119] Standardized production: Standardized production of each component helps ensure the stability of product quality and performance. Compared with the quality fluctuations caused by factors such as environment and personnel skill level during on-site construction, the quality of prefabricated components is easier to control, thereby improving the overall quality of the entire prefabricated steel structure of the floor slab.

[0120] Enhance structural performance

[0121] Stable and reliable connection: Anchor bolts, angle steel, channel steel and other steel materials are used as fixing and support components. They are connected by reliable methods such as welding and bolting to form a stable support system. This can effectively transfer the load of the sealing structure to the existing floor slab, ensuring the load-bearing capacity and stability of the structure, and avoiding problems such as structural loosening and deformation that may occur with traditional sealing methods.

[0122] Multiple layers of protection: The fire-retardant coating, waterproof membrane, and cement mortar protective layer in the protective components work together to provide comprehensive protection for the sealed structure. The fire-retardant coating can improve the fire resistance limit of the steel structure, ensuring the stability of the structure in the event of a fire; the waterproof membrane and protective layer effectively prevent moisture penetration, protecting the floor slab and the space below from moisture erosion and extending the service life of the building structure; the extended waterproofing materials further expand the waterproofing range and enhance the waterproofing effect.

[0123] Optimize usage functions

[0124] Excellent sound insulation: The light steel keel, elastic strips, glass wool, and double-layer gypsum board in the sound insulation components work together to effectively isolate sound transmission. The porous fiber structure of the glass wool absorbs and attenuates sound, while the double-layer gypsum board and elastic strips act as sound barriers and vibration dampers, significantly improving the sound insulation performance of the floor slab. This creates a quiet and comfortable indoor environment for building users, meeting the needs of places with high requirements for acoustic environment.

[0125] Facilitates finishing construction: After the prefabricated steel structure is installed, its surface cement mortar protective layer and double-layer paper-faced gypsum board and other components can be directly used as the base layer for the finishing surface. The finishing surface can be laid normally without affecting subsequent decoration work, simplifying the construction process and improving the convenience of construction.

[0126] Energy saving and environmental protection

[0127] Recyclable materials: Most steel structure materials are recyclable and reusable, reducing construction waste and meeting the requirements of sustainable development. Compared with traditional concrete materials, they reduce the negative impact on the environment.

[0128] Reduced resource consumption: Prefabricated construction methods reduce on-site formwork erection and concrete pouring, thus lowering the consumption of resources such as timber and cement. It also avoids the need for large amounts of water for curing, contributing to resource conservation and achieving green building.

[0129] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A prefabricated steel structure for floor slabs, characterized in that, include: The existing floor slab (1) has an opening in it; Fixing components are used to fix the support components to the existing floor slab (1); Support components are fixed to the existing floor slab (1) and are used to support the sealing components; A sealing component, installed at the opening, is used to seal the opening; A protective component, installed on the sealing component, is used to protect the sealing component; Sound insulation components are installed below the opening to block sound transmission; The fixing components include a fixing member and a support member. The fixing member is fixed to the existing floor slab (1), and the support member is fixed to the existing floor slab (1) through the fixing member. The support assembly includes a connector, which is connected to the support assembly. The sealing assembly includes a sealing plate, which is disposed within the frame formed by the connector and protrudes around the opening. The sealing plate is sealed with a sealant around its perimeter. The protective component includes fireproof material, waterproof material, protective layer and extended waterproof material. The fireproof material is applied around the sealing plate and on the surface of the metal components. The waterproof material is laid on top of the sealing plate. The protective layer is placed on top of the waterproof material. The extended waterproof material is applied to the outside of the protective layer. The sound insulation component includes a keel, a sealant, a sound insulation filling material, and a double-layer panel. The keel is fixed to the side wall below the opening, the sealant fills the gap between the keel and the side wall, the sound insulation filling material is filled inside the keel, and the double-layer panel is fixed to the keel.

2. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The fastener is an anchor bolt (3), the spacing of the anchor bolts (3) is 300mm, and the anchor bolts (3) are fixed on the existing floor slab (1); The support is an angle steel (2), which is fixed to the existing floor slab (1) by anchor bolts (3).

3. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The connecting component is a channel steel (4), which is welded and fixed to the angle steel (2).

4. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The sealing plate is a steel plate (5) with a thickness of ≥10mm. The steel plate (5) is arranged along the short side within the frame formed by the channel steel (4), and the steel plate (5) protrudes ≥200mm around the opening. The steel plate (5) is sealed with sealant (9) around its perimeter.

5. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The fireproof material is a fireproof coating (6), which has a fire resistance limit of ≥1.5h and is applied around the steel plate (5) and on the surface of the steel components.

6. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The waterproof material is a waterproof membrane (7), with an outer overlap of ≥500mm, and is fixed with cement nails (12), and sealed with sealant (11) around the perimeter.

7. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The protective layer is a cement mortar protective layer (8), which is 30mm thick and has an embedded wire mesh.

8. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The extended waterproofing material is a waterproof coating (10), which is applied to the cement mortar protective layer (8) for ≥1000mm.

9. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The keel is a light steel keel (14), which is fixed to the side wall below the opening by expansion bolts (13).

10. The prefabricated steel structure for floor slabs according to claim 1, characterized in that: The caulking material is an elastic strip (15), which caulks the gap between the light steel keel (14) and the side wall; The sound insulation filling material is glass wool (16), which is filled in the light steel keel (14); The double-layer panel is a double-layer paper-faced gypsum board (17), the thickness of the double-layer paper-faced gypsum board (17) is ≥12mm, and it is fixed to both sides of the light steel keel (14) by self-tapping screws, and the seams are filled with sealant (9) around the perimeter.

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