Construction method of cable dome central support tower and working platform integrated system

Abstract

The present invention relates to a construction method for a cable dome central support tower and work platform integrated system, comprising a foundation base, a tower crane body and a construction work platform, and is characterized in that: a jacking system and a tower crane jacking sleeve are installed on the tower crane standard section, the tower crane standard section is installed through the jacking system and the tower crane jacking sleeve, a tower crane standard section introduction port is provided on one side of the tower crane jacking sleeve, and a steel plate fixing cover is fixedly installed on the upper end surface of the tower crane jacking sleeve; the construction work platform comprises a main beam, a reinforced secondary beam and a platform steel plate, the main beam is arranged in an equilateral triangle, and the reinforced secondary beam comprises two groups of equilateral triangle inner sleeve layout structures and a group of three diagonally connected structures through a three-way connection mechanism. The method has the advantages of being suitable for large-scale complex reticular cable dome structures, and a symmetrical tie-tying installation method can make the middle load-bearing component stable, firm, safe and reliable; the elevation control of the top construction work platform is very accurate, and in particular, it plays a vital role in the overall construction quality of large-span suspended projects.

Description

Technical Field

[0001] The invention belongs to the technical field of high-altitude installation construction of independent components of a cable dome, and in particular relates to a construction method of a cable dome central support tower and an operating platform integrated system. Background Art

[0002] In recent years, with the development of society and advancements in science and technology, new demands have been placed on long-span spatial structures, necessitating the creation of novel structural forms to meet these needs. Among the numerous types of long-span spatial structures, engineering scholars have developed a radically new structure—the tensegrity cable dome. This structure has captured global attention with its novel design, ingenious design, and economical construction cost. Upon its introduction, it quickly garnered significant attention from both academic and engineering communities. The cable dome, with its unparalleled structural advantages, has gained widespread application. As a leading modern spatial structure system, it integrates new materials, technologies, and processes with high efficiency. Its lightweight construction, unique design, and magnificent scale have earned it a strong reputation among architects. Hailed as the pinnacle of modern global spatial structural technology, it represents the current state of the art in global spatial structure development and boasts promising application value and development prospects.

[0003] Of course, with the emergence of excellent building structures, there are also appropriate high-level construction techniques to match their own construction processes. This is especially evident in the construction industry, where innovation in materials, technology, or processes, whether unilateral or multi-faceted, will bring considerable challenges to construction. Currently, rope formwork structures are rapidly developing in the construction field, with a wide variety of development forms. Due to their flexibility and versatility in spatial modeling, their tie structures vary in form. However, at this stage, most buildings or structures with large spans use an intermediate inner tie ring to complete their top structural layout. For building structures that connect the entire high-altitude roof structure into a unified whole through inner tie rings, the installation quality of the inner tie rings and the ropes extending to the surrounding areas is the key to controlling the overall roof structure. The spatial location of the inner tie rings determines the quality of the subsequent overall rope installation and connection, as well as the difficulty of subsequent construction.

[0004] This project, based on a gymnasium project with a total construction area of ​​17,100 square meters, features an elliptical cable dome roof structure with a major axis of 102 meters and a minor axis of 82 meters. The lowest point of the core inner pull ring at the top is approximately 23 meters above the ground. The inner pull ring is a cylindrical structure with a diameter of 4 meters and a height of 5.08 meters, and its load capacity is approximately 27 tons. Currently, conventional scaffolding systems on the market are mostly lightweight, thin-walled steel pipe scaffolding. This type of scaffolding is lightweight, easy to connect and install, and has a wide range of applications. However, this type of scaffolding has limited load-bearing capacity and relatively low height adjustment flexibility. Considering the existing construction conditions of this project, it was determined that the existing lightweight, thin-walled steel pipe scaffolding on the market could not meet the on-site construction requirements. Therefore, after joint research and discussion between the Group's Technical Center and the project's technical department, it was decided that a tower crane scaffolding would be the right choice, firstly due to its inherent high support strength; secondly, it is easy to select materials, which facilitates construction schedule control; and especially because the tower crane scaffolding has a certain degree of height adjustment, it is well suited for this project.

[0005] When the tower crane frame is selected as the main supporting load-bearing structure system, while meeting the on-site construction requirements, it is determined through calculation that three independent tower crane frames are required and the relative distance between the frames should be controlled within the range of 7 to 8 meters for best results. This makes the gap span between the tower crane frames relatively large. If an inner pull ring capable of carrying a concentrated load of 27 tons is to be erected, it is necessary to lay a transverse reinforcement load-bearing member connected to any two tower crane frames to form an integral load-bearing system. At the same time, it is convenient for construction and installation personnel to operate. An installation work platform needs to be laid on the top of the transverse reinforcement member to enable the inner pull ring to be accurately installed in place through the work platform. Summary of the Invention

[0006] The present invention aims to solve the technical problems existing in the known technologies and provides a construction method of a cable dome central support tower and an operating platform integrated system.

[0007] The construction method for this cable dome's central support tower and work platform integrated system is suitable for large, complex, and lattice-like cable dome structures. The symmetrical tie-down installation method ensures that the intermediate load-bearing components are stable, secure, and reliable. Its construction process is based on the comprehensive utilization of the existing tower crane's inherent load-bearing capacity and its flexible height adjustment as a support frame to meet current construction needs. The elevation control of the top construction platform is extremely precise. By leveraging the tower crane's built-in lifting system, the central support tower and construction platform integrated system can achieve elevation control within a range of 2.8 meters, which is crucial for the overall construction quality of large-span suspended projects.

[0008] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is:

[0009] The cable dome's central support tower and work platform integrated system includes a foundation base, three tower crane fuselages arranged in a triangle, and a construction work platform fixed on top of the tower crane fuselages. The tower crane fuselages include a tower crane base section, a tower crane standard section, and lattice steel positioning rods. The tower crane base section is fixed with multiple tower crane standard sections arranged vertically from bottom to top via fasteners. Lattice steel positioning rods are provided between the three tower crane fuselages for mutual positioning. The construction work platform includes a platform steel plate, a main beam, a reinforced secondary beam, and a guardrail handrail. It is characterized by:

[0010] The tower crane standard section is equipped with a jacking system and a tower crane jacking sleeve, and a tower crane standard section for increasing the height of the tower crane body is installed through the jacking system and the tower crane jacking sleeve. A tower crane standard section introduction port is provided on one side of the tower crane jacking sleeve, and a steel plate fixing cover is fixed on the upper end surface of the tower crane jacking sleeve;

[0011] The main beams of the construction work platform are arranged in an equilateral triangle, and each main beam is respectively erected on the steel plate fixing cover on the upper end face of the tower crane's top lifting sleeve. The reinforced secondary beams include two groups of equilateral triangle inner sleeve layout structures and a group of three diagonally connected structures through a three-way connection mechanism. The main beams are fixed to the steel plate fixing cover arranged on the upper end face of the tower crane's top lifting sleeve through the platform steel plate fastening mechanism. The platform steel plate is fixed on the upper plane of the reinforced secondary beam. Guardrail handrails and climbing escalators are provided around the platform steel plate. A central pull ring for installing a cable dome is provided at the center of the work platform.

[0012] The present invention can also adopt the following technical solutions:

[0013] Preferably, the two groups of reinforcing secondary beams are arranged in an equilateral triangle inner-nested type, and each corner of the two groups of equilateral triangle reinforcing secondary beams is respectively mounted on each side of the main beam. Another group of three reinforcing secondary beams diagonally connected by a three-way connection mechanism have one end fixed to each other, and the other end overlapped and fixed to each side of the main beam to form a hexagonal star-shaped horizontal, solid and stable force-bearing structure system.

[0014] Preferably, the platform steel plate fastening mechanism for fixing the main beam and the steel plate fixing cover includes a hexagonal screw stabilizing mechanism and a square plate screw stabilizing mechanism.

[0015] Preferably, the hexagonal screw stabilization mechanism includes an upper pressure ring plate, a lower pressure ring plate, a gasket, a round steel pressure ring and a hexagonal screw. The hexagonal screw is sequentially equipped with a round steel pressure ring, a lower pressure ring plate and an upper pressure ring plate from bottom to top. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are fixed to the steel plate fixing cover by hexagonal nuts.

[0016] Preferably, the square plate screw stabilizing mechanism includes an upper pressure ring plate, a lower pressure ring plate, a gasket, a round steel pressure ring and a square plate screw. A round steel pressure ring, a lower pressure ring plate and an upper pressure ring plate are installed on the square plate screw in sequence from bottom to top. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are fixed to the steel plate fixing cover by hexagonal nuts.

[0017] Preferably, the U-shaped fixing clip includes a rectangular clip, a U-shaped bolt and a fastening bolt. The two ends of the U-shaped bolt are fixed by the fastening bolts, and the main beam and the reinforced secondary beam are fixed by the U-shaped fixing clip.

[0018] Preferably, the three-way connection mechanism comprises directional connection steel plates and high-strength bolts, and a group of reinforced secondary beams are fixedly connected diagonally to each other through the three-way connection mechanism.

[0019] A construction method for a cable dome central support tower and work platform integrated system, characterized by comprising the following construction steps:

[0020] S1. Pre-embed high-strength fixed foot bolts. During the construction of the foundation base, first determine the vertical projection position of the inner pull ring according to the drawings, then accurately locate the center point of the inner pull ring projection using a total station. Arrange the three tower crane bodies in an equilateral triangle around the reference point, with a distance of 7 to 8 meters between each two. Pre-embed high-strength fixing bolts according to the placement of the tower crane bodies.

[0021] S2. Install and fix the tower crane foundation section. Install and fix the bottom foundation section of the tower crane according to the project requirements, and then connect the two adjacent tower crane foundation sections with lattice steel connecting rods.

[0022] S3. Install the tower crane standard section. When the working platform needs to adjust the height, the three sets of tower crane bodies should be jacked up synchronously. First, install the tower crane standard sections on the tower crane base section in sequence by using a truck crane. When the maximum lifting installation height of the truck crane is reached, the tower crane lifting sleeve section is installed on the tower crane standard section at the upper end of the tower crane body by using the truck crane. When the initial installation height of the tower crane body does not reach the set height of the predetermined construction working platform, the hydraulic jack is fixed on the tower crane standard section at the upper end of the tower crane body. At this time, it is necessary to use Use an external independent tower crane, hydraulic jack and tower crane lifting sleeve to pull the tower crane standard section through the tower crane standard section inlet on one side of the tower crane lifting sleeve to the top of the tower crane standard section at the top of the tower crane body. Then the installer will align the four columns of the added tower crane standard section with the four columns at the top of the original tower crane standard section one by one, and finally firmly connect the four opposite columns with special high-strength bolts; follow the above steps to install the tower crane standard section until the tower crane body can be effectively lifted to the required construction height;

[0023] S4. Install the construction platform. When the three tower cranes are lifted to the required height, the construction platform can be built. First, use the external tower crane to transport the three main beams to the upper part of the tower crane lifting sleeve, and respectively set them on the steel plate fixing covers on the upper end faces of the two adjacent tower crane lifting sleeves, so that the three main beams are placed in a right triangle shape. The installers fix the three main beams on the steel plate fixing covers through the platform steel plate fastening mechanism. After the main beams are fixed and installed, two groups of steel plates placed in a right triangle shape need to be connected on top of the three main beams. The reinforced secondary beams of the two groups of reinforced secondary beams are respectively overlapped and fixed on each side of the main beam by U-shaped fixing clips. At the same time, one end of the other group of three reinforced secondary beams are fixed to each other through a three-way connection mechanism, and the other end is fixed to the corners of the main beam respectively, so as to form a hexagonal horizontal solid and stable force-bearing structure system; after the main beam, secondary beam and reinforced secondary beam are fixed, the installers are required to fully lay platform steel plates and protective railings on the top of the main beam, secondary beam and reinforced secondary beam, and leave an access ladder on the tower crane body for the construction workers to pass through.

[0024] The advantages and positive effects of the present invention are as follows: since the present invention adopts the above-mentioned technical solution, that is, the support structure is mainly composed of the tower crane body, and its construction platform is mainly composed of I-beam main beams, square steel secondary beams and platform steel plates; the direct starting point of the structure and construction method of the present invention is to comprehensively utilize the load-bearing capacity of the existing tower crane hoisting equipment frame itself and its advantage of flexible height adjustment as a support frame to meet current construction needs; and the above-mentioned construction method has more prominent advantages, such as convenient material selection, sufficient market supply, and its frame itself is very strong. The use of this structure and construction method for the erection of frames of the same height can significantly reduce the construction work range. Different construction environments can appropriately increase or decrease the number of tower crane standard sections according to the actual design conditions to meet the requirements of the frame itself. The choice of steel building materials for the construction platform is mainly based on the engineering needs of this project. Since the relative distance between the tower crane frames must be controlled at 7 to 8 meters, this results in a relatively large gap span in the middle. If an inner pull ring capable of carrying a concentrated load of 27 tons is to be erected, it is necessary to lay a separate horizontal flat load-bearing member.

[0025] The present invention utilizes three tower crane bodies as a support system, offering the following advantages: First, the three crane bodies can be sequentially connected using lattice steel locating rods of the same specifications to form a unified equilateral triangle support frame. The equilateral triangle itself is extremely stable, enhancing the overall stability of the support frame and ensuring safe construction operations. Analysis shows that lattice steel locating rods, when tied every 20 meters of the support frame, can meet the overall safety requirements of the support frame. The construction platform utilizes three I-beams, each mounted on three tower crane top-lifting sleeve fixed cover plates. A layer of equilateral triangle-shaped secondary beams, constructed from square steel, is then laid on top of these beams. Finally, a layer of 5mm thick steel sheeting is laid on top of these secondary beams. A safety steel pipe handrail is installed around the perimeter to ensure safe construction operations. Furthermore, this is the first time that a tower crane body has been used as the support foundation for an aerial work platform, and the use of a nested triangle-shaped locating rod significantly improves the safety and reliability of the construction platform and reduces load-related deformation. This technical solution is convenient for material selection and relatively easy to purchase on the market. In particular, the central pull ring support structure has a simple installation and disassembly process, is easy to use, and the support frame occupies a small area and has a strong bearing capacity.

[0026] The construction method for this cable dome's central support tower and work platform integrated system is suitable for large, complex, and lattice-like cable dome structures. The symmetrical tie-down installation method ensures that the intermediate load-bearing components are stable, secure, and reliable. Its construction process is based on the comprehensive utilization of the existing tower crane's inherent load-bearing capacity and its flexible height adjustment as a support frame to meet current construction needs. The elevation control of the top construction platform is extremely precise. By leveraging the tower crane's built-in lifting system, the central support tower and construction platform integrated system can achieve elevation control within a range of 2.8 meters, which is crucial for the overall construction quality of large-span suspended projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the base structure of the present invention;

[0029] Figure 3 It is a top view of the construction work platform of the present invention;

[0030] Figure 4 yes Figure 1 Schematic diagram of the fixed connection structure of the middle main beam, secondary beam and reinforced secondary beam;

[0031] Figure 5 It is a structural schematic diagram of the U-shaped fixing buckle of the present invention;

[0032] Figure 6 It is a schematic structural diagram of the hexagonal screw stabilizing mechanism of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the square plate screw stabilizing mechanism of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the three-way connection mechanism of the present invention;

[0035] Figure 9 It is a schematic diagram of the construction operation status of installing a tower crane standard section on a tower crane frame according to the present invention.

[0036] Figure: 1. Construction platform; 1-1. Platform steel plate; 1-2. Main beam; 1-3. Reinforced secondary beam; 1-4. Guardrail handrail; 1-5. Climbing ladder; 2. Three-way connection mechanism; 2-1. Directional connection steel plate; 2-2. High-strength bolts; 3. U-shaped fixing clip; 3-1. Rectangular clamp; 3-2. U-shaped bolt; 3-3. Fastening bolt; 4. Platform steel plate fastening mechanism; 4-1. Hexagonal screw stabilization mechanism; 4-2 , square plate screw stabilizing mechanism; 4-3, upper pressure ring plate; 4-4, lower pressure ring plate; 4-5, gasket; 4-6, round steel pressure ring; 4-7, hexagonal screw; 4-8, square plate screw; 5, tower crane standard section; 6, tower crane foundation section; 6-1, high-strength fixed column foot bolt; 7, tower crane jacking sleeve section; 7-1, steel plate fixing cover; 7-2, inlet; 8, lattice steel positioning rod; 9, foundation base; 10, jacking system; 11, inner pull ring. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] See also Figures 1-9 ,

[0039] The cable dome central support tower and work platform integrated system includes a foundation base 9, three groups of tower crane fuselages distributed in an equilateral triangle, and a construction work platform 1 fixed on the top of the tower crane fuselages. The tower crane fuselages include a tower crane base section 6, a tower crane standard section 5, and a lattice steel positioning rod 8. The base 9 of the tower crane base section is fixed with a plurality of tower crane standard sections 5 vertically arranged from bottom to top by fasteners. When fixing the tower crane base section 6, the high-strength fixed column foot bolts 6-1 should be pre-embedded according to the position of the tower crane fuselages. When pre-embedding the high-strength fixed column foot bolts, the vertical depth, vertical deviation, and length of the exposed thread of the high-strength fixed column foot bolts should be ensured to avoid unnecessary engineering accidents caused by the instability of the tower crane fuselages due to the instability of the bottom of the fixed tower crane base section. Lattice steel positioning rods 8 for mutual positioning are provided between the three groups of tower crane fuselages. The lattice steel connecting rods are respectively connected and fixed to the tower crane base sections in pairs to improve the overall stability of the tower crane fuselages and prepare for the later installation of the tower crane standard sections.

[0040] The construction platform comprises a platform steel plate 1-1, a main beam 1-2, reinforced secondary beams 1-3, and guardrail handrails 1-5. The main beams 1-2 are constructed from I-beams and arranged in an equilateral triangle. Each main beam is mounted on a steel plate fixing cover 7-1 on the upper end face of the tower crane's lifting sleeve. Three sets of reinforced secondary beams 1-3, made of square steel, are fixedly attached to the main beams in the equilateral triangle. These reinforced secondary beams comprise two sets of equilateral triangles nested within each other, and one set of three beams diagonally connected to each other via a three-way connection mechanism. The two sets of reinforced secondary beams are arranged in an equilateral triangle nested within each other, with each corner of each set of reinforced secondary beams being fixedly attached to the edges of the main beam via a U-shaped fixing clip 3. Another set of three reinforced secondary beams, diagonally connected via a three-way connection mechanism 2, has one end fixedly connected to each other and the other end fixedly attached to the edges of the main beam, forming a six-pointed star-shaped, horizontal, solid and stable load-bearing structure. The main beam is fixed to the steel plate fixing cover 7-1 arranged on the upper end surface of the tower crane lifting sleeve through the platform steel plate fastening mechanism 4. The platform steel plate 1-1 is laid and fixed on the upper plane of the reinforced secondary beam. Guardrail handrails 1-5 and climbing escalators 1-6 are provided around the platform steel plate. An inner pull ring for installing the cable dome is provided at the center of the working platform.

[0041] The tower crane standard section 5 is equipped with a jacking system 10 and a tower crane jacking sleeve 7, and the tower crane standard section for increasing the height of the tower crane body is installed through the jacking system and the tower crane jacking sleeve. A tower crane standard section inlet 7-2 is provided on one side of the tower crane jacking sleeve, and a steel plate fixing cover 7-1 is fixed on the upper end face of the tower crane jacking sleeve.

[0042] Specifically, the platform steel plate fastening mechanism 4 for fixing the main beam and the steel plate fixing cover includes a hexagonal screw stabilizing mechanism 4-1 and a square plate screw stabilizing mechanism 4-2.

[0043] Specifically, the hexagonal screw stabilizing mechanism 4-1 includes an upper pressure ring plate 4-3, a lower pressure ring plate 4-4, a gasket 4-5, a round steel pressure ring 4-6 and a hexagonal screw 4-7. The hexagonal screw is sequentially provided with a round steel pressure ring, a lower pressure ring plate and an upper pressure ring plate from bottom to top. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are fixed to the steel plate fixing cover 7-1 through a hexagonal nut.

[0044] Specifically, the square plate screw stabilizing mechanism 4-2 includes an upper pressure ring plate 4-3, a lower pressure ring plate 4-4, a gasket 4-5, a round steel pressure ring 4-6 and a square plate screw 4-8. A round steel pressure ring, a lower pressure ring plate and an upper pressure ring plate are installed on the square plate screw in sequence from bottom to top. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are fixed to the steel plate fixing cover by hexagonal nuts.

[0045] Specifically, the U-shaped fixing clip 3 includes a rectangular clip 3-1, a U-shaped bolt 3-2 and a fastening bolt 3-1. The two ends of the U-shaped bolt pass through the rectangular clip and are fixed by the fastening bolts. The main beam and the reinforced secondary beam are fixed by the U-shaped fixing clip.

[0046] Specifically, the three-way connection mechanism 2 includes a directional connection steel plate 2-1 and a high-strength bolt 2-2. The directional connection steel plate is welded by three channel steels. One end of the three channel steels is welded together to form a 120° angle between two adjacent channel steels, and then the three-way connection mechanism is used to implement a diagonal fixation of a group of reinforced secondary beams.

[0047] A construction method for a cable dome central support tower and work platform integrated system includes the following construction steps:

[0048] S1. Pre-embed high-strength fixed foot bolts 6-1. During the construction of the foundation base 9, first determine the vertical projection position of the inner pull ring using the architectural drawings, and then accurately locate the center point of the inner pull ring projection using a total station. The support frame is erected using the center point of the inner pull ring projection as the reference point. To ensure that the loads on the three tower crane bodies acting as the support frame are as balanced as possible and to improve the overall stability of the support frame, the overall center position of the support frame should coincide with the center point of the inner pull ring projection when erecting the support frame. Based on the height of the support frame and the operating range of the construction work platform to be installed on the top, calculations are performed to arrange the three tower crane bodies acting as the support frame in an equilateral triangle around the reference point, with adjacent tower crane bodies 7 to 8 meters apart, which is ideal. Then, according to the location of the tower crane body, the high-strength fixed column foot bolts 6-1 are pre-embedded respectively. When pre-embedding the high-strength fixed column foot bolts, it is necessary to ensure that the vertical depth of the high-strength fixed column foot bolts is greater than 40 cm, the vertical deviation is ±3 mm, and the length of the exposed thread is maintained at more than 6.5 cm, so as to avoid unnecessary engineering accidents caused by the instability of the tower crane frame due to the unstable bottom.

[0049] S2. Install and fix the tower crane foundation section 6. After the high-strength fixed column foot bolts are pre-embedded and the foundation base strength meets the design requirements, the tower crane foundation section that fixes the tower crane body can be installed first according to the project needs. At the same time, check whether the verticality of the tower crane foundation section meets ±3 mm and whether the elevation of the four sides of the tower crane foundation section is uniform to determine whether it meets the construction quality requirements. If there are dimensional deviations in individual tower crane column feet and pre-embedded bolts, they can be appropriately addressed by adding column foot gaskets to achieve a completely uniform elevation of the four sides of the tower crane foundation section, ensuring that the overall construction quality of the tower crane foundation section installation meets the construction requirements. At the same time, lattice steel positioning rods 8 are connected to the tower crane foundation sections in pairs, that is, two adjacent tower crane foundation sections are connected and fixed to each other by lattice steel positioning rods to improve the overall stability of the tower crane body and prepare for the later installation of the tower crane standard section.

[0050] S3. Install the tower crane standard section 5. When the construction platform 1 needs to adjust its height, the three groups of tower crane bodies should be lifted synchronously. First, install the tower crane standard sections 5 in sequence on the tower crane base section 6 through the car crane. When the maximum lifting installation height of the car crane is reached, the tower crane lifting sleeve 7 is installed on the tower crane standard section at the uppermost end of the tower crane body through the car crane. When the initial installation height of the tower crane body does not reach the set height of the predetermined construction platform, the hydraulic jack of the lifting system 10 is fixed to the tower crane standard section at the uppermost end of the tower crane body. At this time, an external independent tower crane, a hydraulic jack and a tower crane lifting sleeve are required to cooperate to pull the tower crane standard section through the tower crane standard section inlet 7-2 on one side of the tower crane lifting sleeve to the top of the tower crane standard section at the uppermost part of the tower crane body. When installing a tower crane standard section, the ear shafts (or hooks) on both sides of the hydraulic jack should be fixed in advance to the supporting steps (or standard section crossbeams) of the penultimate tower crane standard section, and then the tower crane top lifting section should be pushed upward by the hydraulic jack. When the lifting height of the tower crane top lifting section meets the installation height of the tower crane standard section, the jacking operation of the hydraulic jack should be stopped, and then the tower crane standard section should be lifted to the tower crane standard section inlet 7-2 on one side of the tower crane top lifting section by an independent tower crane. At this time, the installation worker will use the traction device to pull it from the outside of the tower crane standard section inlet of the tower crane top lifting section to the inside of the tower crane top lifting section, and then align the four columns of the added tower crane standard section with the four columns at the upper end of the original tower crane standard section one by one, and then firmly connect the four opposite columns by using special high-strength bolts. After the installation quality inspection is passed, retract the hydraulic jack piston rod, so that the ear shafts (or hooks) on both sides of the hydraulic jack base move upward with the hydraulic jack piston rod. After moving to the installed tower crane standard section support step, pressurize the hydraulic jack again to continue to lift and push the tower crane lifting sleeve upward. Repeat the above process of installing the tower crane standard section. In this way, the tower crane body can be effectively lifted to the height required for construction.

[0051] When the tower crane reaches the desired height, the hydraulic jack pressure is reduced to zero, the hydraulic jack assembly is removed, and the fixed end of the tower crane's lifting sleeve is connected to the top vertical pole of the installed tower crane standard section with high-strength bolts. To ensure the safety of the crane's overall load-bearing system, a set of lattice steel locating rods is installed every 15 to 20 meters from the first set of lattice steel locating rods 8 at the tower crane base section to reinforce the fixation and ensure the overall stability of the crane's frame.

[0052] S4. Install the construction work platform 1. When the height of the three tower crane bodies is lifted to the required construction elevation, the construction work platform can be built. First, use an external tower crane to transport the three I-steel main beams 1-2 of model 40a to the top of the tower crane lifting sleeve, and respectively set them up on the steel plate fixing cover 7-1 on the upper end face of the two adjacent tower crane lifting sleeves, so that the three main beams are placed in a right triangle shape as a whole. The installers use the platform steel plate fastening mechanism 4 to fix the three main beams on the steel plate fixing cover. The platform steel plate fastening mechanism includes a hexagonal screw stabilizing mechanism 4-1 and a square plate screw stabilizing mechanism 4-2; the hexagonal screw stabilizing mechanism is suitable for fixing the three main beams separately by punching on the steel plate fixing cover, and the square plate screw stabilizing mechanism is suitable for fixing the three main beams separately by welding on the steel plate fixing cover. When fixing by punching, it can be pressed Figure 6 The main beam is fixed with the hexagonal screw 4-7 through the circular hole punched on the steel plate fixing cover; first, the gasket 4-5 is put on the hexagonal screw 4-7, and then the hexagonal screw 4-7 is passed from bottom to top through the hole punched on the steel plate fixing cover 7-1, and then the lower pressure ring plate 4-4, the upper pressure ring plate 4-3 and the gasket 4-5 are respectively put on the hexagonal bolt 4-7, and then the round steel pressure ring 4-6 is inserted between the lower pressure ring plate 4-4 and the upper pressure ring plate 4-3, and at the same time, the round steel pressure ring 4-6 is fastened to the lower flange of the I-beam main beam, and finally the nut is tightened to make the I-beam main beam firmly fixed on the steel plate fixing cover.

[0053] When welding is used for fixing, Figure 7 The main beam is fixed by welding the bottom of the square plate screw directly to the steel plate fixing cover; first, the square plate of the square plate screw 4-8 is fully welded to the steel plate fixing cover 7-1, and then the upper pressure ring plate and gasket 4-5 are inserted into the square plate screw 4-8 at one time, and then the round steel pressure ring 4-6 is inserted into the lower part of the upper pressure ring plate 4-3. At the same time, the round steel pressure ring 4-6 is fastened to the lower flange of the I-beam main beam, and finally the nut is tightened to make the I-beam main beam firmly fixed on the steel plate fixing cover.

[0054] After the main beam is fixed and installed, three sets of reinforced secondary beams need to be fixed and overlapped on the three main beams to improve the overall density of the horizontal load-bearing members. The three sets of reinforced secondary beams include two sets of equilateral triangle-shaped inner-nested layouts and one set of structures fixed end-to-end through a three-way connection mechanism. First, each corner of the two sets of reinforced secondary beams is overlapped and fixed to each side of the main beam through a U-shaped fixing clip 3. The layout of the two sets of reinforced secondary beams is to first overlap the two equilateral triangles with different side lengths through their respective center points, and then make their corners face each other and their sides face each other. At the same time, one end of another set of three reinforced secondary beams is fixed to each other through the three-way connection mechanism 2, and the other end is fixed to the corners of the main beam respectively. This can improve the overall load-bearing stability of the reinforced secondary beams, provide a technical foundation and safety guarantee for the later construction of the platform steel plate, and finally effectively connect the main beam and the reinforced secondary beams to form a hexagonal horizontal load-bearing structure system. After the main beam and the reinforced secondary beam are fixed, the installers need to fully lay the platform steel plate 1-1 and the guardrail handrail 1-5 on the top of the main beam and the reinforced secondary beam, and leave a climbing ladder 1-6 on the tower crane body for construction workers to pass through.

[0055] S5. Assembling the inner tie ring 11: Because the inner tie ring carries too much weight, it cannot be transported to the top of the construction platform in one piece. Therefore, it must be disassembled into its components and transported to the top of the platform in batches. Then, technicians weld and assemble each component according to the construction drawings. This allows the heavily loaded inner tie ring to be lifted to a high altitude, which facilitates the connection and installation of the roof rope structure. The reason for performing step 5 after step 4 is that the construction platform of the tower crane is first raised to or near the end point, then the construction platform is constructed, and then the inner tie ring is reassembled on the elevated platform. This construction sequence primarily reduces the difficulty of the tower crane lifting process and the strain on the lifting system. Because the tower crane support platform itself has an automatic lifting function, this construction sequence can also be reversed by reversing steps 4 and 5. At a lower elevation relative to the tower crane support frame, the construction platform is first constructed, followed by the inner tie ring. Finally, utilizing the inherent lifting capabilities of the tower crane support system, the three tower crane bodies, along with the construction platform, are simultaneously lifted as a whole until they reach the desired height. This construction method can avoid the danger of technicians working at high altitude during installation, but it also increases the difficulty of the overall lifting and installation of the tower crane frame. Therefore, the specific implementation method should be selected according to the actual situation on site.

[0056] The embodiments described in the drawings of the present invention are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

Claims

1. A cable dome central support tower and work platform integrated system, comprising a foundation base, three tower crane bodies arranged in a triangular pattern, and a construction work platform fixed to the top of the tower crane bodies. The tower crane bodies comprise a tower crane base section, a tower crane standard section, and lattice steel locating rods. The tower crane base section is secured with fasteners to a plurality of tower crane standard sections arranged vertically from bottom to top. Lattice steel locating rods are used to connect the three tower crane bodies. The construction work platform includes a platform steel plate, a main beam, a reinforced secondary beam and a protective railing handrail, and is characterized by: The tower crane standard section is equipped with a jacking system and a tower crane jacking sleeve, and a tower crane standard section for increasing the height of the tower crane body is installed through the jacking system and the tower crane jacking sleeve. A tower crane standard section introduction port is provided on one side of the tower crane jacking sleeve, and a steel plate fixing cover is fixed on the upper end surface of the tower crane jacking sleeve; The main beams of the construction platform are arranged in an equilateral triangle. Each main beam is respectively mounted on a steel plate fixing cover on the upper end face of the tower crane's lifting sleeve. The reinforced secondary beams include two groups of equilateral triangle inner sleeve layout structures and a group of three components connected by a three-way connection mechanism. The main beam is fixed to the steel plate fixing cover arranged on the upper end surface of the tower crane lifting sleeve through the platform steel plate fastening mechanism. The platform steel plate is fixed on the upper plane of the reinforced secondary beam. Guardrail handrails and climbing escalators are provided around the platform steel plate. A central pull ring for installing the cable dome is provided at the center of the construction work platform.

2. The cable dome central support tower and work platform integrated system according to claim 1, characterized in that: The two groups of equilateral triangle inner-nested layout structures are respectively installed on each side of the main beam, and one end of the three components of the other group are fixedly connected to each other through a three-way connection mechanism, and the other ends of the three components are fixedly connected to the vertices of the equilateral triangle inner-nested layout structure to form a hexagonal horizontal, solid and stable force-bearing structure system.

3. The cable dome central support tower and work platform integrated system according to claim 1, characterized in that: The platform steel plate fastening mechanism used for fixing the main beam and the steel plate fixing cover includes a hexagonal screw stabilizing mechanism and a square plate screw stabilizing mechanism.

4. The cable dome central support tower and work platform integrated system according to claim 3 is characterized in that: The hexagonal screw stabilizing mechanism includes an upper pressure ring plate, a lower pressure ring plate, a gasket, a round steel pressure ring and a hexagonal screw. The hexagonal screw is sequentially equipped with a round steel pressure ring, a lower pressure ring plate and an upper pressure ring plate from bottom to top. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are fixed to the steel plate fixing cover through a hexagonal nut.

5. The cable dome central support tower and work platform integrated system according to claim 3, characterized in that: The square plate screw stabilizing mechanism includes an upper pressure ring plate, a lower pressure ring plate, a gasket, a round steel pressure ring and a square plate screw. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are sequentially installed on the square plate screw from bottom to top. The round steel pressure ring, the lower pressure ring plate and the upper pressure ring plate are fixed to the steel plate fixing cover by hexagonal nuts.

6. The cable dome central support tower and work platform integrated system according to claim 1, characterized in that: It also includes a U-shaped fixing clip, which includes a rectangular clip, a U-shaped bolt and a fastening bolt. The two ends of the U-shaped bolt are fixed by the fastening bolts, and the main beam and the reinforced secondary beam are fixed by the U-shaped fixing clip.

7. The cable dome central support tower and work platform integrated system according to claim 1, characterized in that: The three-way connection mechanism includes directional connection steel plates and high-strength bolts, and the three components of another group are fixedly connected through the three-way connection mechanism.

8. A construction method for a cable dome central support tower and work platform integrated system, characterized by: The construction steps include: S1. Pre-embed high-strength fixed foot bolts. During the construction of the foundation base, first determine the vertical projection position of the inner pull ring according to the drawings, then accurately locate the center point of the inner pull ring projection using a total station. Arrange the three groups of tower crane bodies in an equilateral triangle around the center point, with a distance of 7 to 8 meters between each group. Pre-embed high-strength fixed foot bolts according to the placement position of the tower crane bodies. S2. Install and fix the tower crane foundation section. Install and fix the bottom of the tower crane foundation section according to the project requirements, and then connect the two adjacent tower crane foundation sections with lattice steel positioning rods. S3. Install the tower crane standard section. When the construction platform needs to adjust the height, the three sets of tower crane bodies will be lifted synchronously. First, the tower crane standard sections will be installed on the tower crane base section in sequence by the car crane. When the maximum lifting height of the car crane is reached, the tower crane lifting sleeve will be installed on the tower crane standard section at the upper end of the tower crane body by the car crane. When the initial installation height of the tower crane body does not reach the set height of the predetermined construction platform, the hydraulic jack will be fixed on the tower crane standard section at the upper end of the tower crane body. Use an external independent tower crane, hydraulic jack and tower crane lifting sleeve to pull the tower crane standard section through the tower crane standard section inlet on one side of the tower crane lifting sleeve to the top of the tower crane standard section at the top of the tower crane body. Then the installer will align the four columns of the added tower crane standard section with the four columns at the top of the original tower crane standard section one by one, and finally firmly connect the four opposite columns with special high-strength bolts. According to the above steps of installing the tower crane standard section, the tower crane body can be effectively lifted to the required construction height. S4. Install the construction platform. When the three tower cranes are lifted to the required height, the construction platform can be built. First, use the external tower crane to transport the three main beams to the upper part of the tower crane lifting sleeve, and respectively set them on the steel plate fixing covers on the upper end faces of the two adjacent tower crane lifting sleeves, so that the three main beams are placed in a right triangle shape. The installers fix the three main beams on the steel plate fixing covers through the platform steel plate fastening mechanism. When the main beams are fixed and installed, two sets of right triangle inner sleeves are placed on the three main beams. Layout structure, the equilateral triangle inner-sheathed layout structure is overlapped and fixed on each side of the main beam through U-shaped fixing clips, and at the same time, one ends of another group of three components are fixed to each other through a three-way connection mechanism, and the other ends of the three components are respectively fixed to the vertices of the equilateral triangle inner-sheathed layout structure to form a hexagonal horizontal, solid and stable force-bearing structure system; after the main beam and the reinforced secondary beam are fixed, the installers will fully lay platform steel plates and protective railings on the top of the main beam and the reinforced secondary beam, and leave an access ladder on the tower crane body to facilitate the passage of construction workers.

Images