A conversion layer construction method of a bolt-sphere type steel net rack suspended ceiling

Abstract

The present application relates to the technical field of building construction, in particular to a conversion layer construction method of bolt ball type steel net rack suspended ceiling, comprising the following steps: conversion layer arrangement, using Revit software to model, and carrying out U-shaped hoop blanking processing and conversion layer support processing; conversion layer structure installation, including U-shaped hoop structure installation; conversion layer structure hanger installation, including upper angle steel installation, middle connecting angle steel installation and lower angle steel installation; the beneficial effect is that: the conversion layer construction method of bolt ball type steel net rack suspended ceiling provided by the present application utilizes the original ball node to form a hoop structure, and the lower angle steel is bolted with the suspended ceiling structure to form an overall force system of suspended ceiling structure → conversion layer → original steel structure. The "cold construction" is adopted between the conversion layer and the original steel member, which does not cause thermal influence and structural damage to the formed steel member, and does not cause uneven overall force of the steel structure.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a method for constructing a transition layer in a bolted ball-type steel grid ceiling. Background Technology

[0002] With the rapid development of the national economy, there are more and more tall buildings in cities. The original large-space wooden structure roof and ring beam concrete structure roof are difficult to construct, have high costs, and have long construction cycles. They are gradually being replaced by steel structure space frames.

[0003] In existing technologies, steel space frame structures are spatial structures composed of multiple members connected at nodes according to a certain grid pattern. They possess advantages such as low spatial stress, light weight, high rigidity, and good seismic performance. Steel space frame structures are a modern form of green building. During construction, space frame structures offer short construction time and long lifespan, maximizing resource conservation, improving the quality of the surrounding environment, and providing a better space for healthy and comfortable architecture. Currently, steel space frame structures offer advantages such as light overall weight, short construction time, good seismic resistance, and low foundation costs, enabling factory-style construction. Construction is not limited by time constraints, thus saving costs for construction companies and reducing construction waste.

[0004] However, the disadvantages of steel space frame structures include a large number of members converging at the nodes, the inability to achieve aesthetically pleasing interior ceilings, and the inability to weld the steel space frame structure's stress and overall surface layer. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for the transition layer of a bolted ball-type steel space frame ceiling to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for constructing a transition layer in a bolted ball-type steel space frame ceiling, the method comprising the following steps:

[0007] The layout of the transfer layer was modeled using Revit software, and the U-shaped clamps and transfer layer supports were fabricated.

[0008] Installation of the transfer layer structure, including the installation of the U-shaped clamp structure;

[0009] The installation of the transfer layer structure hangers includes the installation of the upper angle steel, the installation of the intermediate connecting angle steel, and the installation of the lower angle steel.

[0010] Preferably, the specific operations for U-shaped clamp blanking include:

[0011] Two clamping nodes are set at each ball node position. The clamping flat steel is connected to the lower structure by bolts. When cutting the flat steel, M12 bolt holes need to be reserved. After the bolt holes are reserved, the flat steel needs to be processed and bent into a "U" shape.

[0012] Preferably, the specific operations for processing the conversion layer support include:

[0013] The upper angle steel is processed and connected to the clamping structure by M12 bolts. Bolt holes should be reserved during the processing of the upper angle steel.

[0014] The intermediate connecting angle steel is processed to connect the upper and lower angle steels, and together with the upper and lower angle steels, it forms a transfer layer hanger.

[0015] The lower angle steel is processed and connected to the ceiling structure by bolts. Bolt holes need to be reserved when cutting the lower angle steel.

[0016] Preferably, the specific operation for installing the U-shaped clamp structure includes:

[0017] Lay out the lines and determine the distance between the installation point and the ball node using BIM and CAD software. Use a measuring tape to accurately locate the installation point and mark it with a marker or chalk.

[0018] For U-shaped hoop installation, the processed U-shaped hoop is directly fitted onto the connection points on both sides of the ball joint. Before installation, a laser leveling instrument is placed in a suitable position to ensure that the reserved bolt holes are on the same horizontal plane after the U-shaped hoop is installed.

[0019] The U-shaped hoop is spot-welded in place. After the U-shaped hoop is installed and adjusted to ensure that everything is correct, it is spot-welded in place.

[0020] Preferably, the installation of the upper angle steel specifically includes:

[0021] After all the clamp structures are installed, the upper angle steel of the transfer layer structure hanger is installed. The upper angle steel is installed horizontally along the steel structure grid, and the upper angle steel is connected to the clamp structure by M12 high-strength bolts.

[0022] Weld the upper angle steels. After the upper angle steels are connected and fixed with the U-shaped hoop bolts, connect the various angle steel components together with butt welds. The butt welds are required to be fully welded on both sides and the welds are full.

[0023] Preferably, the specific operation for installing the intermediate connecting angle steel includes:

[0024] After the installation of the upper angle steel is completed, the intermediate connecting angle steel is installed. Before installation, the arrangement spacing and installation points of the intermediate connecting angle steel are determined according to the arrangement mode, the position is determined by means of a laser leveler, and marks are made on the upper part of the upper angle steel with chalk or a marker pen to ensure the accuracy of the installation position; the intermediate connecting angle steel functions to connect the upper and lower angle steel and transfer the lower load to the upper structure, and an integral body is formed between the intermediate connecting angle steel and each structure through welding.

[0025] Preferably, the specific operation for installing the lower angle steel comprises:

[0026] Welding with the intermediate connecting angle steel, the lower angle steel layer and the intermediate connecting angle steel are connected into an integral body through welding, and a "[-shaped fillet weld is made at the contact position of the two angle steel members;

[0027] Connecting between the lower angle steel layer and the ceiling layer, the main function of the transfer layer structure is to serve as a connecting layer between the original steel structure and the ceiling structure.

[0028] Preferably, the U-shaped hoop comprises a U-shaped plate, two parallel distributed side plates of the U-shaped plate are each provided with a through hole, a screw sleeve is fixedly arranged on each of the two parallel distributed side plates of the U-shaped plate, one end of the screw sleeve is sleeved and fixed with a rubber support ring, and a fastening bolt penetrates through the two screw sleeves.

[0029] Preferably, the inner ring diameter of the screw sleeve is smaller than the diameter of the through hole, an edge groove is formed on the outer annular surface of the screw sleeve, the edge groove is an annular groove, the rubber support ring is sleeved in the edge groove, one end of the rubber support ring is fixed on the surface of the edge groove, the pipe length of the rubber support ring is greater than the depth of the edge groove, a plurality of embedding grooves are formed on the inner annular surface of the screw sleeve, a rubber clamping block is fixed on the surface of the embedding groove, and the rubber clamping block protrudes out of the embedding groove.

[0030] Preferably, one end of the rubber support ring is fixed with a pressure ring, a sliding block is fixed on the inner annular surface of the pressure ring, the sliding block is slidably connected in a sliding groove, and the sliding groove is formed on the surface of the edge groove.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] The transfer layer construction method for a bolted ball-type steel grid ceiling proposed by the present invention utilizes an original spherical node to form a hoop structure, and is fastened with the ceiling structure through a lower angle steel bolt, forming an integral force bearing system of ceiling structure → transfer layer → original steel structure. "Cold construction" is adopted between the transfer layer and the original steel member, which will not cause thermal influence and structural damage to the formed steel member resulting in uneven overall stress of the steel structure, will not damage the anti-corrosion layer and fire-resistant layer that have been sprayed on the surface of the steel structure, avoids the occurrence of secondary re-coating, and is particularly applicable to the situation where main steel members have been hoisted and completed. Description of Drawings

[0033] Figure 1This is a schematic diagram of the U-shaped hoop structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the U-shaped plate structure of the present invention;

[0035] Figure 3 This is a top view of the U-shaped plate structure of the present invention;

[0036] Figure 4 for Figure 3 Sectional view of the structure at point AA;

[0037] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle;

[0038] Figure 6 This is a schematic diagram of the wire sleeve structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the connection structure between the rubber support ring and the pressure ring of the present invention;

[0040] Figure 8 This is a flowchart of the method of the present invention.

[0041] In the diagram: 1. U-shaped plate; 2. Perforation; 3. Threaded sleeve; 4. Side groove; 5. Rubber support ring; 6. Pressure ring; 7. Slider; 8. Slide groove; 9. Embedding groove; 10. Rubber clamp; 11. Fastening bolt. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] Please see Figure 8 This invention provides a technical solution: a construction method for the transition layer of a bolted ball-type steel space frame ceiling, the method comprising the following steps:

[0045] I. Transition Layer Layout

[0046] To avoid conflicts in elevation and location between the transfer layer and other installation disciplines, a three-dimensional layout should be created for this section before construction, which can be done using Revit software. The layout should start from the design, refine the construction drawings, and optimize the installation method. Based on the layout of the ceiling structure, the arrangement of the longitudinal and transverse members of the transfer layer should be determined according to the principles of structural simplicity, clear load transfer, and high overall stability. This will maximize cost savings, reduce load, and improve work efficiency while meeting construction requirements. In particular, the connection nodes between the transfer layer structure and the original steel components above and the ceiling structure below should be designed to ensure safety and reliability.

[0047] (1.) Material cutting and processing

[0048] (2.) U-shaped clamp blanking processing

[0049] The clamps are made of flat steel, with a specification of 50mm × 4mm, all of which are Q235B steel. Taking into account the spacing between the spherical nodes of the space frame and structural safety, two clamp nodes are provided at each spherical node position. Since the spherical nodes of the lower layer of the space frame are the same size, the flat steel used for the clamps is the same length of 30cm, which reduces the processing difficulty.

[0050] The clamping flat steel is connected to the lower structure by bolts. When cutting the flat steel, M12 bolt holes need to be reserved. When drilling the holes, the drilling position needs to be calculated accurately to ensure a firm connection with the lower structure.

[0051] After the bolt holes are pre-drilled, the flat steel needs to be bent into a "U" shape and then installed directly on site.

[0052] Each U-shaped hoop has two pre-drilled M12 bolt holes for connection to the substructure. 'a' represents the width of the edge of the component with the pre-drilled bolt holes; 'a' should be no less than 3cm to ensure the safety and reliability of the U-shaped hoop.

[0053] (3.) Transition layer support structure

[0054] The conversion layer support is composed of longitudinal and transverse angle steel and vertical connecting angle steel, all made of Q235B steel and L50×4 angle steel.

[0055] 1) Upper angle steel

[0056] The upper angle steel is connected to the clamping structure via M12 bolts; therefore, bolt holes should be pre-drilled during the fabrication of the upper angle steel. The location of the holes should be precisely calculated to ensure they align with the pre-drilled bolt holes in the clamping structure during installation, thus preventing misalignment during installation.

[0057] The cutting length of angle steel should be determined based on actual needs and ease of construction. Welding points should be avoided at the clamp locations and the mid-span of the two ball joints. The clamp locations are load transfer paths; welding points here will cause construction inconvenience and negatively impact structural safety. The mid-span is the connection point between upper angle steels and vertical angle steels; stress concentration will occur here, and multiple welding operations will adversely affect structural safety.

[0058] 2) Intermediate connecting angle steel

[0059] The intermediate connecting angle steel serves to connect the upper and lower angle steels, forming a transition layer hanger together with them. Since the positions of the upper and lower angle steel layers are fixed, the length of the intermediate connecting angle steel is uniform, and the specific length 'a' can be determined according to the ceiling height.

[0060] 3) Lower angle steel

[0061] The lower angle steel connects to the ceiling structure via bolts. Therefore, bolt holes must be pre-drilled when cutting the lower angle steel, and the diameter of the pre-drilled holes depends on the diameter of the bolts. The positions of the bolt holes also need to be precisely calculated based on the ceiling layout to ensure the accuracy of the bolt positions and achieve the desired effect.

[0062] Key points for construction of side trench 4

[0063] 1) Cutting

[0064] Before cutting, oil, rust and moisture should be removed from the surface of the base material; after cutting, the gas-cut surface should be smooth and free of cracks, slag and flying debris should be removed, the sheared edge should be ground, and the cutting slag should be removed after cutting.

[0065] 2) Milling and grinding

[0066] Before welding, beveling should be done in advance, and burrs should be removed and polished using a milling machine.

[0067] punching

[0068] When using scribing drilling, five-pointed star patterns should be punched around the center and perimeter of the hole to facilitate drilling and inspection.

[0069] Drilling tolerances are as follows:

[0070] ① The allowable diameter deviation is 0 to +1.0 mm;

[0071] ② The allowable deviation for roundness is 1.5mm;

[0072] ③ The allowable deviation of verticality is ≤0.03t and ≤2.0mm.

[0073] ④ Hole center offset △L: -1≤△L≤+1;

[0074] ⑤ Hole spacing offset: △P-1≤△P1≤+1 (within the same group of holes), -2≤△P2≤+2 (between groups of holes);

[0075] ⑥ The misalignment of the hole e: e≤1;

[0076] ⑦ Hole edge distance △: △≥-3, L should not be less than 1.5d or meet the design requirements.

[0077] (6.) Anti-corrosion coating of clamp structure and transition layer angle steel

[0078] The clamp structure uses 50mm×4mm flat steel, all of which is Q235B steel. The transfer layer support is also made of Q235B steel and L50×4 angle steel. All surfaces are coated with anti-corrosion coating. Generally, steel structure anti-corrosion uses red lead alkyd anti-rust primer, and then fireproof coating is directly brushed on top. The anti-corrosion paint is not sealed. To ensure the durability of the transfer layer, the following more environmentally friendly and durable supporting solution will be adopted:

[0079] Three coats of epoxy zinc-rich primer (75μm thick) and three coats of epoxy micaceous iron oxide intermediate coat (60μm thick) were applied at the manufacturing plant. Two coats of topcoat were applied on-site, using isocyanate-free acrylic polysiloxane topcoat with a thickness of 25μm, for a total thickness of 160μm.

[0080] In addition, the outermost layer of anti-corrosion paint on the clamp structure is painted fire-resistant red.

[0081] The anti-corrosion coatings used for the transfer layer support and clamp structure, the rust removal grade of the steel surface, and the structural requirements for corrosion protection of the steel structure must comply with the provisions of the "Code for Corrosion Protection Design of Industrial Buildings" (GB50046-2008) and "Rust Grades and Rust Removal Grades of Steel Surfaces Before Painting" (GB / T 8923). In addition, the surface treatment of the steel structure must meet the following requirements: Before painting, burrs, rust, scale, oil stains, and other attachments on the surface of the steel structure must be thoroughly cleaned. Thorough rust removal should be performed using methods such as sandblasting and shot blasting to achieve SIS-Sa2.5 grade. On-site touch-up painting and rust removal can be performed using electric or pneumatic rust removal tools to achieve SIS-Sa3 grade. After the rust-removed steel surface passes inspection, painting should be carried out within the required time limit.

[0082] II. Installation of the transfer layer structure

[0083] 1) Installation of U-shaped clamp structure

[0084] A. Laying out and positioning

[0085] Based on the layout of the initial BIM model, all spherical nodes are designated as installation points for the clamp structure. The distance between the installation points and the spherical nodes is determined using BIM and CAD software. Measurement tools such as tape measures are used to accurately locate the installation points, which are then marked with a marker or chalk. The allowable error range for the distance between the installation point and the spherical node is [-10mm, 10mm]. If this range is exceeded, misalignment will occur between the U-shaped clamp and the bolt holes of the lower angle steel at that location; therefore, the accuracy of this location must be strictly controlled.

[0086] B. Installation of U-shaped clamps

[0087] Once the installation points for the U-shaped clamps are determined, on-site construction and installation will proceed directly. Two U-shaped clamps will be installed at each ball joint location, one on each side. During installation, the pre-fabricated U-shaped clamps will be directly fitted onto the connection points on both sides of the ball joint. Before installation, a laser level should be placed in a suitable location to ensure that the pre-drilled bolt holes of the U-shaped clamps are on the same horizontal plane. The allowable error range between the bolt hole positions and the design positions is [-10mm, 10mm]. Exceeding this allowable error range may lead to difficulties in installing the angle steel above the transfer layer and may result in the U-shaped clamps not being able to evenly distribute the load.

[0088] Rubber pads are placed at the contact points between the U-shaped hoop and the original space frame structure to reduce wear on the original structure and provide some seismic resistance.

[0089] C. Fixing with U-shaped hoop spot welding

[0090] After the U-shaped hoop is installed and adjusted to ensure it is correct, it is then spot-welded in place. Care must be taken to protect the original steel components during welding to avoid damage.

[0091] III. Installation of Hangers for Transfer Floor Structure

[0092] 1) Installation of upper angle steel

[0093] A. Connection with clamp structure

[0094] After all the clamp structures are installed, the upper angle steel of the transfer layer structure hanger is installed. The upper angle steel is installed laterally along the steel structure space frame. The upper angle steel is connected to the clamp structure using M12 high-strength bolts.

[0095] B. Welding of the upper angle steel sections

[0096] After the upper angle steel is connected and fixed with the U-shaped bolts, the various angle steel components are connected together by butt welds. The butt welds must be fully welded on both sides and the welds must be full.

[0097] 2) Installation of intermediate connecting angle steel

[0098] After the upper angle steel is installed, the intermediate connecting angle steel is installed. Before installation, the arrangement spacing and installation points of the intermediate connecting angle steel are determined according to the layout method. The position is determined by means of a laser level and other measuring instruments and marked on the upper angle steel with chalk or a marker to ensure the accuracy of the installation position.

[0099] The function of the intermediate connecting angle steel is to connect the upper and lower angle steels and transfer the lower load to the upper structure. The intermediate connecting angle steel and each structure are formed into a whole by welding.

[0100] 3) Installation of lower angle steel

[0101] After all the intermediate connecting angle steels are welded, the installation of the lower angle steel starts. Before the construction of the lower angle steel, a laser level is also used to determine an installation horizontal plane on the intermediate connecting angle steel, and the position is marked with a marker or chalk to ensure that the lowermost angle steel layer is on the same horizontal plane after installation, so as to guarantee the aesthetics of the ceiling structure.

[0102] A. Welding with intermediate connecting angle steel

[0103] The lower angle steel layer and the intermediate connecting angle steel are connected into a whole by welding. A "匚"-shaped fillet weld is made at the contact position of the two angle steel members, and the weld is required to be full.

[0104] B. Connection between lower angle steel layer and ceiling layer

[0105] The main function of the conversion layer is to serve as the connecting layer between the original steel structure and the ceiling structure. Therefore, the connection between the lower angle steel layer and the ceiling layer is very important. The ceiling structure is connected with the lower angle steel layer by bolts through suspension wires.

[0106] The present invention overcomes the limiting factors that the force system of the steel structure grid cannot be changed and the integral surface layer cannot be welded, and forms a hoop structure by using the original ball nodes. Through bolting the lower angle steel and the ceiling structure, an integral force system of ceiling structure → conversion layer → original steel structure is formed. "Cold construction" is adopted between the conversion layer and the original steel member, which will not cause thermal influence and structural damage to the formed steel member resulting in uneven overall stress of the steel structure, and will not damage the anti-corrosion layer and fire-resistant layer that have been sprayed on the surface of the steel structure, avoiding the occurrence of secondary recoating. The invention is especially suitable for the situation where the main steel members have been hoisted. It is suitable for large-span and large-space steel structure grid buildings with high requirements on the aesthetics of indoor ceilings. BIM modeling can be carried out for layout in advance, cross construction is reasonably arranged, conflicts among various majors in the construction process are reduced, and work efficiency is improved. The height of the conversion layer can be adjusted according to the actual requirements of the ceiling height, which is flexible and has wide applicability. It can be combined with hydropower installation projects at the same time, the space is reasonably arranged and fully utilized, so that the space has great layering. The construction period benefit is significant. The installation materials are prefabricated in the factory, and can be directly installed after entering the site. The process flow is simple, and it is easy to form flow operation when combined with other installation constructions.

[0107] Example 2

[0108] Based on Embodiment 1, in order to achieve the installation of the reinforced U-shaped hoop, the U-shaped hoop includes a U-shaped plate 1. Two parallel side plates of the U-shaped plate 1 are each provided with a through hole 2, and two parallel side plates of the U-shaped plate 1 are each fixed with a threaded sleeve 3. A rubber support ring 5 is fitted and fixed to one end of the threaded sleeve 3. Two threaded sleeves 3 are pierced by fastening bolts 11. The inner ring diameter of the threaded sleeve 3 is smaller than the diameter of the through hole 2. A side groove 4 is provided on the outer ring surface of the threaded sleeve 3. The side groove 4 is an annular groove. The rubber support ring 5 is fitted in the side groove 4, and one end of the rubber support ring 5 is fixed to the surface of the side groove 4. The tube length of the rubber support ring 5 is greater than the depth of the side groove 4. Multiple fitting grooves 9 are provided on the inner ring surface of the threaded sleeve 3. A rubber clamp 10 is fixed to the surface of the fitting groove 9, and the rubber clamp 10 protrudes from the fitting groove 9. A pressure ring 6 is fixed to one end of the rubber support ring 5. A slider 7 is fixed to the inner ring surface of the pressure ring 6. The slider 7 is slidably connected in a sliding groove 8, which is located on the surface of the side groove 4.

[0109] After the bolt 11 is passed through the two threaded sleeves 3 in sequence, the bolt is simultaneously screwed into the two threaded sleeves 3. Even without a nut, the bolt will not fall off the U-shaped plate 1. The rubber clamp 10 is held between the threaded sleeve 3 and the bolt to prevent gaps and loosening between the bolt and the threaded sleeve 3. To ensure that the U-shaped plate 1 is firmly installed, the nut is screwed onto the bolt and locked until the end plate of the bolt presses against the pressure ring 6. The pressure ring 6 drives the slider 7 to slide along the slide groove 8. At the same time, the pressure ring 6 presses against the rubber support ring 5 to produce elastic deformation. The rebound force of the rubber support ring 5 acts as an elastic washer for the bolt tightening.

[0110] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a transition layer in a bolted ball-type steel space frame ceiling, characterized in that: The method includes the following steps: The layout of the transfer layer was modeled using Revit software, and the U-shaped clamps and transfer layer supports were fabricated. Installation of the transfer layer structure, including the installation of the U-shaped clamp structure; The installation of the transfer layer support includes the installation of the upper angle steel, the installation of the intermediate connecting angle steel, and the installation of the lower angle steel; The specific operations for U-shaped clamp blanking include: Two clamping nodes are set at each ball node position. The clamping flat steel is connected to the lower structure by bolts. When cutting the flat steel, M12 bolt holes need to be reserved. After the bolt holes are reserved, the flat steel needs to be processed and bent into a "U" shape. The specific operations for processing the conversion layer support include: The upper angle steel is processed and connected to the clamping structure by M12 bolts. Bolt holes should be reserved during the processing of the upper angle steel. The intermediate connecting angle steel is processed to connect the upper and lower angle steels, and together with the upper and lower angle steels, it forms a transition layer support. The lower angle steel is processed and connected to the ceiling structure by bolts. Bolt holes need to be reserved when cutting the lower angle steel. The U-shaped clamp includes a U-shaped plate (1), and through holes (2) are provided on the two parallel side plates of the U-shaped plate (1). A threaded sleeve (3) is fixed on the two parallel side plates of the U-shaped plate (1). A rubber support ring (5) is fitted and fixed on one end of the threaded sleeve (3). The two threaded sleeves (3) are penetrated by fastening bolts (11). The inner ring diameter of the thread sleeve (3) is smaller than the diameter of the perforation (2). The outer ring surface of the thread sleeve (3) is provided with a side groove (4). The side groove (4) is an annular groove. The rubber support ring (5) is sleeved in the side groove (4). One end of the rubber support ring (5) is fixed to the surface of the side groove (4). The tube length of the rubber support ring (5) is greater than the depth of the side groove (4). The inner ring surface of the thread sleeve (3) is provided with multiple insert grooves (9). The surface of the insert groove (9) is fixed with a rubber clamp (10). The rubber clamp (10) protrudes from the insert groove (9). One end of the rubber support ring (5) is fixed with a pressure ring (6), and a slider (7) is fixed on the inner ring surface of the pressure ring (6). The slider (7) is slidably connected in the slide groove (8), and the slide groove (8) is opened on the surface of the side groove (4).

2. The construction method for the transition layer of a bolted ball-type steel space frame ceiling according to claim 1, characterized in that: The specific steps for installing the U-shaped clamp structure include: Lay out the lines and determine the distance between the installation point and the ball node using BIM and CAD software. Use a measuring tape to accurately locate the installation point and mark it with a marker or chalk. For U-shaped clamp installation, the processed U-shaped clamp is directly fitted onto the connection points on both sides of the ball joint. Before installation, a laser level is placed in a suitable position to ensure that the reserved bolt holes are on the same horizontal plane after the U-shaped clamp is installed. U-shaped clamps are spot-welded for fixation. After the U-shaped clamps are installed and adjusted to ensure they are correct, they are spot-welded for fixation.

3. The construction method for the transition layer of a bolted ball-type steel grid ceiling according to claim 1, characterized in that: The installation of the upper angle steel specifically includes: After all the clamp structures are installed, the upper angle steel of the conversion layer support is installed. The upper angle steel is installed horizontally along the steel structure grid, and the upper angle steel is connected to the clamp structure with M12 high-strength bolts. Each upper angle steel is welded; after the upper angle steels are connected and fixed with the U-shaped hooping bolts, all the angle steel components are connected together through butt welds, and the butt welds require double-sided full welding with full weld beads.

4. The construction method for the transition layer of a bolted ball-type steel grid ceiling according to claim 1, characterized in that: The specific operation for installing the intermediate connecting angle steel includes: After the installation of the upper angle steels is completed, the installation of the intermediate connecting angle steel is carried out. Before installation, the arrangement spacing and installation points of the intermediate connecting angle steel are determined according to the arrangement mode, the position is determined by means of a laser leveler and other measuring instruments, and marks are made on the upper part of the upper angle steels with chalk or a marker pen to ensure the accuracy of the installation position; the intermediate connecting angle steel functions to connect the upper and lower angle steels and transfer the lower load to the upper structure, and the intermediate connecting angle steel and each structure form an integral body through welding.

5. The construction method for the transition layer of a bolted ball-type steel space frame ceiling according to claim 1, characterized in that: The specific operation for installing the lower angle steels includes: Welding with the intermediate connecting angle steel: the lower angle steel layer and the intermediate connecting angle steel are connected into an integral body through welding, and a "匚"-shaped fillet weld is made at the contact part of the two angle steel components; Connection between the lower angle steel layer and the ceiling layer: the conversion layer structure functions as the connecting layer between the original steel structure and the ceiling structure.

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