Method for reinforcing prestressed cable of integrally hoisted single-layer spherical reticulated shell

Abstract

The application discloses a whole lifting special-shaped single-layer spherical net shell prestressed steel strand cable reinforcing method, a middle support rod is arranged below a center ring of a special-shaped single-layer spherical net shell structure, a plurality of reinforcing steel strand connecting pieces are arranged on the lower end of the middle support rod in a ring direction; a plurality of tension connecting pieces are arranged on an outer ring beam of the net shell structure in a ring direction, prestressed steel strand cables are arranged between the reinforcing steel strand connecting pieces and the tension connecting pieces and are tensioned, the lifting part of the net shell is reinforced, and a chord self-balanced net shell reinforcing structure is formed. The method of the scheme solves the difficulty that the special-shaped single-layer spherical net shell has poor rigidity and is easily damaged in the lifting process. Through the prestressed steel strand cable reinforcing method, the single-layer spherical net shell structure with poor rigidity is converted into the chord self-balanced net shell structure with good rigidity, and the structural safety of the whole lifting net shell structure is ensured.

Description

Technical Field

[0001] This invention belongs to the field of steel structure construction in the building construction industry, and specifically relates to a method for reinforcing an irregular single-layer spherical reticulated shell with prestressed cables for overall lifting. Background Technology

[0002] Grid shell structures offer a novel and rational structural form for buildings. They combine the main characteristics of both rod-structured and thin-shell structures, exhibiting rational stress distribution and the ability to span large distances. As a typical spatial structure, the rationally designed curved surfaces ensure uniform force flow, resulting in high stiffness, minimal deformation, high stability, and material savings.

[0003] It can accommodate various shapes on the building plan, such as circles, rectangles, polygons, sectors, and various irregular planes. It can form a variety of curved surfaces on the building exterior.

[0004] For reticulated shell structures, the main task is to perform internal force and displacement calculations for external loads (including vertical and horizontal loads) during the service phase. For single-layer reticulated shells, stability calculations are usually required, and the members are designed accordingly.

[0005] The integral lifting technology for reticulated shells offers significant advantages in terms of construction efficiency, quality, safety, and economy. However, in the construction of some single-layer reticulated shell structures, the integral lifting structure, being an irregularly shaped single-layer spherical reticulated shell with poor structural rigidity, is prone to deformation during the lifting process, potentially leading to structural damage. Therefore, controlling the stress and strain of the structural system and ensuring synchronicity during the lifting process are particularly important in the reinforcement construction of single-layer spherical reticulated shells.

[0006] In conclusion, a safe, stable, efficient, and economical method for reinforcing irregularly shaped single-layer reticulated shells is needed in the construction of single-layer reticulated shell lifting projects. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a method for reinforcing a single-layer spherical reticulated shell with prestressed cables for overall lifting, which solves the problem that the lifting of the single-layer spherical reticulated shell is prone to damage in the prior art.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] The method for reinforcing the irregular single-layer spherical reticulated shell with prestressed steel strand cables involves installing a central strut below the central ring of the irregular single-layer spherical reticulated shell structure, with several reinforcing steel strand connectors circumferentially installed at the lower end of the central strut; several tension connectors are circumferentially installed on the outer ring beam of the reticulated shell structure, and prestressed steel strand cables are stretched and tensioned between the reinforcing steel strand connectors and the tension connectors to reinforce the lifted part of the reticulated shell, thus forming a cable-supported self-balancing reticulated shell reinforcement structure.

[0010] It also includes an adjustable steel bar and a tensioning conversion beam connected to the tension connector. The tension connector is welded to the outer ring beam of the reticulated shell structure, and the two ends of the adjustable steel bar are respectively connected to the tension connector and the tensioning conversion beam.

[0011] After the prestressed steel strand cable passes through the reinforcing steel strand connector and the tensioning conversion beam, both ends of the steel strand cable are fixed by anchor plates.

[0012] A diagonal brace is also provided between the lower end of the central strut and the irregular single-layer spherical mesh shell.

[0013] The specific construction process is as follows:

[0014] Step 1: Install the central support rod. Set the vertical central support rod and diagonal support rod below the central ring of the reticulated shell. The upper end of the central support rod is connected to the reticulated shell structure by a pin. The two ends of the diagonal support rod are connected to the reticulated shell and the central support rod by pins, respectively.

[0015] Step 2: Install the tension connector and the tensioning transition beam. The tension connector is welded to the outer ring beam of the grid shell structure. Adjustable steel bars are connected between the tension connector and the tensioning transition beam and fixed with bolts.

[0016] Step 3: Install the prestressed steel strand cable. Pass the prestressed steel strand cable through the lower end of the middle support rod, the reinforcing steel strand connector, and the tensioning conversion beam. Fix both ends of the steel strand cable with anchor plates.

[0017] Step 4: Tensioning of steel strand cables. After all steel strand cables are installed in place, they are tensioned in batches to adjust the deformation and internal force of the lifting shell during the lifting process.

[0018] The number of steel strands included in each prestressed steel strand cable is determined based on the stress calculation at the lifting point.

[0019] The tension connector is set to correspond to the lifting and lowering point of the reticulated shell structure.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The proposed solution addresses the challenges of poor rigidity and structural damage during the overall lifting process of irregular single-layer spherical reticulated shells.

[0022] 2. By using prestressed steel strand cable reinforcement, the single-layer spherical reticulated shell structure with poor rigidity is transformed into a cable-supported self-balancing reticulated shell structure with better rigidity, ensuring the structural safety of the overall lifting of the reticulated shell structure. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the main structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the partitioning of the dome-shaped reticulated shell structure of the present invention.

[0025] Figure 3 This is an elevation view of the reticulated shell structure lifting system of the present invention.

[0026] Figure 4 This is a cross-section showing the completed installation of the raised section of the reticulated shell structure according to the present invention. Figure 1 .

[0027] Figure 5 This is a cross-section showing the completed installation of the raised section of the reticulated shell structure according to the present invention. Figure 2 . Figure 6 This is a plan view of the prestressed steel strand cable arrangement of the present invention.

[0028] Figure 7 This is a partially enlarged view of the connection between the prestressed steel strand cable and the lower lifting point of the present invention.

[0029] Figure 8 The figures show cross-sectional views of the struts and detailed views of each node in this invention; where a1 and a2 are front and side cross-sectional views of node a; b1 and b2 are front and side cross-sectional views of node b; c1 is a partial enlarged view of node 3; and c2 and c3 are front and side cross-sectional views of the diagonal struts.

[0030] Figure 9 This is a top view of the lower node of the strut in this invention.

[0031] Figure 10 for Figure 9 The views are shown along different directions; where a is the view along 1-1; b is the view along 2-2; c is the view along 3-3; and d is the view along 4-4.

[0032] Figure 11 for Figure 10 View along the 5-5 direction.

[0033] Figure 12 This is a schematic diagram of the connection node at the outer ring beam of the steel strand cable of the present invention; wherein, a is a schematic diagram of the connection node, b is a view along the 1-1 direction, c is a schematic diagram of the tension connection member, and d is a view along the 4-4 direction.

[0034] Figure 13 This is a three-dimensional schematic diagram of the reinforced mesh shell of the present invention.

[0035] The markings in the diagram are as follows: 1-Third floor; 2-Fourth floor; 3-19th floor slab; 4-Non-lifting section; 5-Lifting section; 6-Additional support member; 7-Lifting lower suspension point; 8-Lifting steel strand; 9-Outer ring beam of the mesh shell; 10-Tension connector; 11-Adjustable steel bar; 12-Tensioning conversion beam; 13-Steel strand cable; 14-Intermediate strut; 15-Diagonal strut; 16-Stiffening plate. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0037] This proposal suggests a method for reinforcing irregular single-layer spherical reticulated shells with prestressed steel strand cables during overall lifting. This method aims to address the practical difficulties of irregular single-layer spherical reticulated shell structures, such as poor rigidity, easy deformation during overall lifting, and potential structural damage, thereby ensuring the smooth progress of the overall lifting.

[0038] The method for reinforcing the irregular single-layer spherical reticulated shell with prestressed steel strand cables involves installing a central strut below the central ring of the irregular single-layer spherical reticulated shell structure, with several reinforcing steel strand connectors circumferentially installed at the lower end of the central strut; several tension connectors are circumferentially installed on the outer ring beam of the reticulated shell structure, and prestressed steel strand cables are stretched and tensioned between the reinforcing steel strand connectors and the tension connectors to reinforce the lifted part of the reticulated shell, thus forming a cable-supported self-balancing reticulated shell reinforcement structure.

[0039] Specific embodiments, such as Figures 1 to 12 As shown,

[0040] This embodiment uses a specific project as an example. The main building is a hollow spherical steel structure resembling the sun, with 19 floors above ground and a height of 97.8 meters, making it the world's largest single spherical building. The main structure of the main building is a high-rise, irregularly shaped steel structure supported by a large-diameter hollow sphere with a polar coordinate system as the main axis. The main structure of the first three floors is cylindrical with an outer diameter of 74.4 meters; the main structure of the fourth floor and above is spherical (the internal atrium space is spherical), with a maximum horizontal outer diameter of 97.2 meters and a structural height of 87 meters. The standard architectural plan of the main building consists of a ring-shaped area and vertical circulation boxes. The ring-shaped area is evenly divided into 44 main bays along the ring direction. The roof dome structure above the atrium is a Lianfang-Kaiweite hybrid single-layer spherical reticulated shell with a span of 58.8 meters and a rise of 10.1 meters. It is composed of welded joints and box-shaped members, connected by welding.

[0041] The dome structure is installed using a combination of high-altitude assembly and cable-stayed self-balancing overall lifting method, including non-lifted part 4 and lifting part 5. That is, the top ring area and vertical traffic box area of ​​the spherical structure are assembled at high altitude, and the atrium area is lifted by cable-stayed self-balancing overall lifting and then connected by supplementary rods 6.

[0042] The atrium's raised mesh shell structure is butterfly-shaped and is not a complete spherical mesh shell. The atrium mesh shell is lifted by setting up six lifting points on the 19th floor of the main structure, with each lifting point equipped with a 60t hydraulic lifting device.

[0043] Because the overall lifting structure is an irregularly shaped single-layer spherical reticulated shell, its structural rigidity is poor, making it prone to deformation and potential damage during the overall lifting process. This patent proposes a prestressed steel cable reinforcement method for the irregularly shaped single-layer spherical reticulated shell during overall lifting, aiming to solve the above difficulties and ensure the smooth overall lifting of the reticulated shell.

[0044] A central strut is installed below the central ring of the integrally lifted irregular single-layer spherical reticulated shell. Prestressed steel strand cables are tensioned between the lower end of the central strut and the lower lifting point, transforming the relatively rigid irregular single-layer spherical reticulated shell structure into a more rigid cable-supported self-balancing reticulated shell structure, ensuring the structural safety of the integral lifting of the reticulated shell structure. The method for reinforcing the integrally lifted irregular single-layer spherical reticulated shell with prestressed steel strand cables includes the following steps:

[0045] 1. The prestressed steel cable reinforcement system includes: one central strut 14, one diagonal strut 15, six lifting lower suspension points 7 (three sets of E, F, and G suspension points respectively), 12 tension connectors 10 in 6 sets, 6 tension conversion beams 12, 12 adjustable steel bars 11 in 6 sets, and 15 Φ15.2mm prestressed steel strand cables 13 in 6 sets (4 steel strands for cable A, 2 steel strands for cable B, and 2 and 1 steel strand for cable C respectively).

[0046] 2. Installation of the lifting section of the grid shell structure floor frame: The lifting section of the grid shell is assembled at the projected positions on the third floor 1 and the fourth floor 2.

[0047] 3. Installation of the central strut system: A vertical central strut 14 and a diagonal strut 15 with a specification of P203×8 are installed below the central ring of the grid shell. The upper end of the central strut 14 is connected to the grid shell structure through a Φ50 pin. The two ends of the diagonal strut 15 are connected to the grid shell and the central strut 14 through Φ50 pins, respectively. Several reinforcing steel strand connectors are installed circumferentially at the lower end of the central strut.

[0048] 4. Installation of tension connectors and tension conversion beam: Several tension connectors are welded circumferentially on the outer ring beam of the grid structure. Stiffening plates 16 are installed on both sides of the tension connectors. The tension connectors 10 are welded to the ring beam 9 of the grid structure at the lower lifting point 7. The two ends of the adjustable steel bar 11 are connected to the tension connectors 10 and the tension conversion beam 12 respectively, and fixed with bolts.

[0049] 5. Installation of prestressed steel strand cables: Prestressed steel strand cables are installed between the reinforcing steel strand connectors and the tension connectors. The prestressed steel strand cables pass through the reinforcing steel strand connectors and the tensioning transition beam at the lower end of the middle strut, and are fixed by anchor plates at both ends of the steel strand cables.

[0050] 6. Steel Strand Cable Tensioning: After the steel strand cables are installed and in place, they are tensioned to adjust the deformation and internal forces of the lifting mesh shell during the lifting process. The six groups of steel strand cables are divided into three categories (A, B, and C). Prestress is applied to steel strand cables A, B, and C in batches to achieve the calculated cable force. The specific batch tensioning process is as follows:

[0051] In the first batch, the A, B, and C steel strand cables were initially pre-tightened to 10% of their tension.

[0052] In the second batch, the tension of the A-steel strand cables was increased to 50% of the cable tension.

[0053] In the third batch, the B-steel strand cables were tensioned to 50% of their tension.

[0054] In the fourth batch, the C-steel strand cables were tensioned to 50% of their tension.

[0055] In the fifth batch, the C-steel strand cables were tensioned to 90% of their tension.

[0056] In the sixth batch, the B-steel strand cables were tensioned to 90% of their tension.

[0057] In the 7th batch, the A-steel strand cables were tensioned to 90% of their tension.

[0058] In the 8th batch, the A-steel strand cables were tensioned to 100% tension.

[0059] In the 9th batch, the B-steel strand cables were tensioned to 100% tension.

[0060] In the 10th batch, the C-steel strand cables were tensioned to 100% tension.

[0061] After the steel strand cables are tensioned, the lifting section of the mesh shell is reinforced to form a cable-supported self-balancing mesh shell reinforcement structure.

[0062] The number of steel strands included in each prestressed steel strand cable is determined based on the stress calculation at the lifting point.

[0063] The tension connector is set to correspond to the lifting and lowering point of the reticulated shell structure.

[0064] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0065] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0066] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0067] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0068] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0069] The circuits, electronic components, and equipment involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this application does not involve any improvement to the software.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for reinforcing prestressed steel strand cables in an irregularly shaped single-layer spherical reticulated shell with overall lifting, characterized in that: A central strut is installed below the central ring of the irregular single-layer spherical reticulated shell structure. Several reinforcing steel strand connectors are circumferentially installed at the lower end of the central strut. Several tension connectors are circumferentially installed on the outer ring beam of the reticulated shell structure. Prestressed steel strand cables are stretched and tensioned between the reinforcing steel strand connectors and the tension connectors to reinforce the raised part of the reticulated shell, forming a cable-supported self-balancing reticulated shell reinforcement structure. It also includes an adjustable steel bar and a tension conversion beam connected to the tension connectors. The tension connectors are welded to the outer ring beam of the reticulated shell structure. The two ends of the adjustable steel bar are respectively connected to the tension connectors and the tension conversion beam. After the prestressed steel strand cables pass through the reinforcing steel strand connectors and the tension conversion beam, the two ends of the steel strand cables are fixed by anchor plates.

2. The method for reinforcing prestressed steel strand cables of an irregularly shaped single-layer spherical reticulated shell with overall lifting according to claim 1, characterized in that: A diagonal brace is also provided between the lower end of the central strut and the irregular single-layer spherical mesh shell.

3. The method for reinforcing prestressed steel strand cables of an irregularly shaped single-layer spherical reticulated shell with overall lifting according to claim 2, characterized in that: The specific construction process is as follows: Step 1: Install the central support rod. Set the vertical central support rod and diagonal support rod below the central ring of the reticulated shell. The upper end of the central support rod is connected to the reticulated shell structure by a pin. The two ends of the diagonal support rod are connected to the reticulated shell and the central support rod by pins, respectively. Step 2: Install the tension connector and the tensioning transition beam. The tension connector is welded to the outer ring beam of the grid shell structure. Adjustable steel bars are connected between the tension connector and the tensioning transition beam and fixed with bolts. Step 3: Install the prestressed steel strand cable. Pass the prestressed steel strand cable through the lower end of the middle support rod, the reinforcing steel strand connector, and the tensioning conversion beam. Fix both ends of the steel strand cable with anchor plates. Step 4: Tensioning of steel strand cables. After all steel strand cables are installed in place, they are tensioned in batches to adjust the deformation and internal force of the lifting shell during the lifting process.

4. The method for reinforcing prestressed steel strand cables of an irregularly shaped single-layer spherical reticulated shell with overall lifting as described in claim 3, characterized in that: The number of steel strands included in each prestressed steel strand cable is determined based on the stress calculation at the lifting point.

5. The method for reinforcing prestressed steel strand cables of an irregularly shaped single-layer spherical reticulated shell with overall lifting according to claim 1, characterized in that: The tension connector is set to correspond to the lifting and lowering point of the reticulated shell structure.

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