Beam-penetrating prestressed cable and spiral steel structure construction method

Abstract

The invention provides a beam-penetrating prestressed cable and a construction method of a spiral steel structure, and belongs to the field of building construction. According to the technical scheme, the beam comprises a beam body, prestressed tendons and connecting pieces, and up-down corresponding through holes are formed in the upper surface and the lower surface of the beam body; the positioning ring plate is arranged on the periphery of the upper and lower through holes of the beam body, and internal threads are arranged on the inner wall of the positioning ring plate; the prestressed tendons penetrate through the upper through hole and the lower through hole of the beam body and are in threaded connection with the internal threads of the positioning ring plate; the connecting pieces are used for connecting the ends of the adjacent prestressed tendons on the beam body, so that the prestressed tendons are sequentially connected through the connecting pieces, and the beam-penetrating prestressed cable is formed. The device has the beneficial effects that reliable force transmission between the spiral steel beam and a cable system is achieved by connecting the positioning ring plate with the internal thread and the beam-penetrating prestressed screw, an initial state is formed by combining equivalent weight loading and prestressed tensioning, structural deformation is effectively controlled, and the installation precision and the use geometric shape are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to a construction method for through-beam prestressed cables and spiral steel structures. Background Technology

[0002] With the proliferation of large-span stadiums, convention centers, transportation hubs, and other buildings, the use of a combination of steel and cable structures to form large-space load-bearing systems is becoming increasingly common. Among these systems, the spiral steel beams arranged along spatial curves not only serve as load-bearing components but also meet the requirements of architectural form and functional integration. To meet the demands for overall stiffness and deformation control, prestressed cables are often placed in and around the spiral steel beams in engineering projects. Prestressing is used to "tighten" or "suppress" the structure as a whole, thereby improving the stress state and spatial form during the service phase.

[0003] In existing engineering projects, the connection between prestressed tendons and steel beams often involves pre-drilling holes or sleeves in the beam to allow the prestressing tendons to pass through the interior of the spiral steel beam, and then anchoring them to other components at both ends or mid-span. This approach often treats the point where the tendons pass through the beam merely as a "passage point" for the prestressing tendons, lacking a dedicated beam-through joint structure. On the one hand, the contact between the prestressing tendons and the spiral steel beam is often indirect or simply supported, with prestress primarily transferred at the end anchorages. The beam itself cannot reliably participate in the prestressing action at the beam-through point, leading to unclear force coupling between the beam and tendons. On the other hand, drilling holes in the spiral steel beam weakens the beam's cross-sectional load-bearing capacity. Without appropriate reinforcement, this can easily create localized weak points, affecting structural safety and durability.

[0004] At the construction level, spatial spiral steel beams exhibit large curvature and significant torsion, while on-site working space is limited. Existing methods for threading prestressed tendons through beams often rely on on-site threading of long-length prestressed tendons and multiple adjustments, resulting in a cumbersome construction process and difficulty in ensuring operational precision. Due to the lack of standardized construction techniques that match the structure of the threaded beam joints, extensive on-site measurements, temporary reinforcements, and repeated tensioning adjustments are often required, increasing construction costs and timelines, and making it difficult to accurately control the magnitude of prestress and the force transmission path.

[0005] Furthermore, spiral steel structures are subjected to multiple loads during construction and use, including self-weight, prestressing, structural elements, and decorative finishes, making their overall deflection and torsional deformation quite sensitive. Current construction methods typically follow a sequence of "completing the main spiral steel beam structure first—arranging and tensioning the cable structure—and finally carrying out architectural and decorative construction." This approach lacks equivalent consideration of architectural and decorative loads and a comprehensive set of techniques for controlling the combined deformation of prestressing and subsequent loads. Consequently, the actual geometric shape of the completed spiral steel structure deviates from the design model, making it difficult to fully guarantee the architectural spatial effect and effectively assess and utilize structural safety reserves.

[0006] In summary, existing technologies lack, on the one hand, a dedicated through-beam prestressed cable joint structure and supporting construction process that balances the weakening and reinforcement of through holes with the reliable transfer of prestress, making it difficult to achieve the overall stress distribution between the prestressed cable and the spiral steel beam; on the other hand, for the deformation control of spiral steel structures under the combined action of prestressing and building and decoration loads, there is a lack of a construction method that coordinates the design of construction sequence, simulated load and prestressing tensioning process, and it is necessary to propose new technical solutions to improve this. Summary of the Invention

[0007] The purpose of this invention is to provide a construction method for prestressed cables and spiral steel structures that uses a threaded positioning ring plate connected to a prestressed threaded rod to achieve reliable force transmission between the spiral steel beam and the cable system. This method combines equivalent weight loading and prestressing tension to form an initial state, effectively controlling structural deformation and ensuring installation accuracy and usability of the geometric shape.

[0008] This invention is achieved through the following measures: A through-beam prestressed tendon includes a beam, prestressed tendons, and connectors, characterized in that the upper and lower surfaces of the beam have corresponding through holes. A positioning ring plate is disposed around the upper and lower through holes of the beam body, used to reinforce the beam body at the through holes and serve as the connection interface for prestressed tendons. The inner wall of the positioning ring plate is provided with internal threads. A number of prestressed tendons that pass through the upper and lower through holes of the beam and are threadedly connected to the internal thread of the positioning ring plate. And a connector that connects the ends of adjacent prestressing tendons on the beam, so that several prestressing tendons are connected sequentially through the connector to form a through-beam prestressing cable.

[0009] The invention also has the following specific features: The beam is a spatially spirally arranged spiral steel beam, and the continuous prestressed cable system is arranged along the spiral path of the spiral steel beam.

[0010] The prestressing tendon is made of high-strength screw, which is threaded to the positioning ring plate through the internal thread on the inner wall of the positioning ring plate. The high-strength screw is integrated with the spiral steel beam and the upper and lower positioning ring plates.

[0011] The two ends of the high-strength screw are exposed beyond the outer side of the positioning ring plate by a predetermined design length, and the exposed portions at both ends of the high-strength screw are reserved with external threads.

[0012] The connector includes a pair of threaded connecting sleeves that are respectively threaded to the external threads of the ends of adjacent prestressing tendons, and a connecting cable connected between the pair of threaded connecting sleeves; The two ends of the connecting cable are respectively hinged to the corresponding threaded connecting sleeves.

[0013] The positioning ring plate is welded to the outer surface of the beam and surrounds the upper and lower through holes. This is to reinforce the beam that has been weakened by the through holes.

[0014] A construction method for a spiral steel structure, utilizing a through-beam prestressed cable structure, includes the following steps: S1. Erect a formwork or construction frame to carry out the construction of the main spiral steel beam structure, forming the main spiral steel beam structure with the designed spatial geometry; S2. Calculate the weight of the structure and decoration of each area of ​​the spiral steel beam, and suspend sandbags or other heavy objects of equal mass at the corresponding positions on the main structure of the spiral steel beam to simulate the actual load distribution of the building and decoration. S3. The prestressed cable is constructed on the spiral steel beam using the through-beam prestressed cable construction method, so that the prestressed cable passes through the upper and lower through holes of the spiral steel beam and is connected to the spiral steel beam. S4. Tension the prestressed tendons in the prestressed cable, and then remove the formwork or construction frame, so that the structure can produce a predetermined deformation and reach the design displacement state under the combined action of its own weight, suspended sandbags or other heavy objects and prestress. This state is defined as the initial state. S5. Based on the initial state, while removing the sandbags or other heavy objects, carry out building decoration construction, add building and decoration methods until the construction is completed, so that the structural displacement after the construction is completed is controlled within the design allowable range.

[0015] In step S2, sandbags or other heavy objects of equal mass are suspended in corresponding positions according to the calculated weight of the structure and decoration of each area of ​​the spiral steel beam, in order to simulate the actual load distribution of the building and decoration.

[0016] The prestressed cable construction method for beams described in step S3 includes: At the prestressing insertion location of the spiral steel beam, prefabricate or process on-site the upper and lower through holes and positioning ring plate nodes for installing the through-beam prestressed cable structure; The prestressing tendons are threaded through the upper and lower through holes and connected to the internal thread of the positioning ring plate to form a plurality of through-beam prestressing tendons; and adjacent prestressing tendons on the spiral steel beam are connected by connectors so that the prestressing tendons are connected in sequence to form a continuous through-beam prestressing cable.

[0017] After the prestressed tendons are tensioned and the jig or construction frame is removed in step S4, the spiral steel structure reaches the initial state under the combined action of its own weight, suspended sandbags or other heavy objects, and prestress.

[0018] In step S5, by removing the sandbags or other heavy objects and adding architectural and decorative elements, the overall displacement and torsional deformation of the spiral steel structure in its final use state are controlled within the design limits.

[0019] The beneficial effects of this invention are as follows: by connecting the internally threaded positioning ring plate with the through-beam prestressed screw, reliable force transmission between the spiral steel beam and the cable system is achieved. Combined with the equivalent weight loading and prestressing tension to form the initial state, the structural deformation is effectively controlled, ensuring installation accuracy and usage geometry. This invention involves installing positioning ring plates with internal threads on the outer perimeter of the upper and lower through holes in a spiral steel beam. High-strength prestressing tendons are threaded through the spiral steel beam using high-strength bolts, forming an integral load-bearing unit with the positioning ring plates. This achieves two main benefits: firstly, it enables a direct and clear transfer of prestress from the cable system to the beam at the beam-through joint; secondly, it provides circumferential reinforcement to the beam cross-section weakened by the openings, significantly improving the load-bearing capacity and overall stiffness of the beam-through joint and enhancing the load-bearing reliability of the beam-cable joint.

[0020] This invention utilizes a connector consisting of a high-strength screw end external thread, a threaded connecting sleeve, and a hinged connecting cable to sequentially connect several through-beam prestressing tendons, forming a continuous through-beam prestressing cable. This structure facilitates the prefabrication of positioning ring plates, connectors, etc., in the factory, requiring only standardized threaded connections and tensioning operations on site. It eliminates the need for numerous long prestressing tendons to be threaded and repeatedly adjusted on-site, simplifying the prestressing construction process on complex spatial spiral steel beams, shortening the construction period, and improving installation accuracy and construction safety.

[0021] This invention proposes a complete construction sequence: "Erecting a scaffold or construction frame → Suspending sandbags or other heavy objects of equal mass to simulate decorative loads → Constructing and tensioning prestressed cables through beams → Removing the scaffold to form the initial state → Removing heavy objects and implementing architectural decoration construction based on the initial state." By introducing simulated loads equivalent to architectural and decorative practices during the spiral steel structure construction stage, the prestressing effect is considered holistically in conjunction with self-weight, simulated heavy objects, and subsequent actual decorative loads. By replacing simulated loads with actual decorative loads based on the initial state, the overall displacement and torsional deformation of the spiral steel structure in its final service state are controlled within the design limits, ensuring that the structural geometry and architectural spatial effect meet design requirements, while simultaneously improving the predictability and safety margin of the structural stress state. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a spiral steel beam arranged in a spatial spiral configuration according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the prestressed cable through beam in an embodiment of the present invention.

[0024] The attached diagram is labeled as follows: 1. Spiral steel beam; 2. Through-beam prestressed cable; 3. Connecting cable; 4. Threaded connecting sleeve; 5. Positioning ring plate; 6. High-strength screw. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.

[0026] Example 1 See Figure 1 and 2 A type of through-beam prestressed cable 2 includes a beam body, prestressed tendons and connectors, with corresponding through holes on the upper and lower surfaces of the beam body; The positioning ring plate 5 is set around the upper and lower through holes of the beam body, used to reinforce the beam body at the through holes and serve as the connection interface for prestressed tendons. The inner wall of the positioning ring plate 5 is provided with internal threads. Several prestressed tendons that penetrate the upper and lower through holes of the beam and are threadedly connected to the internal threads of the positioning ring plate 5. And connecting pieces at the ends of adjacent prestressing tendons on the beam, so that several prestressing tendons are connected in sequence through the connecting pieces to form a through-beam prestressing cable 2.

[0027] The beam is a spiral steel beam 1 arranged in a spatial spiral, and the continuous prestressed cable system is arranged along the spiral line of the spiral steel beam 1.

[0028] The prestressing tendons are made of high-strength screws 6. The high-strength screws 6 are threaded to the positioning ring plate 5 through the internal thread on the inner wall of the positioning ring plate 5. The high-strength screws 6 are connected to the spiral steel beam 1 and the upper and lower positioning ring plates 5 to form a whole.

[0029] The two ends of the high-strength screw 6 are exposed beyond the outer side of the positioning ring plate 5 for a predetermined design length, and the exposed parts at both ends of the high-strength screw 6 are reserved with external threads.

[0030] The connector includes a pair of threaded connecting sleeves 4 that are respectively threaded to the external threads of the ends of adjacent prestressing tendons, and a connecting cable 3 connected between the pair of threaded connecting sleeves 4; The two ends of the connecting cable 3 are respectively hinged to the corresponding threaded connecting sleeve 4.

[0031] Positioning ring plate 5 is welded to the outer surface of the beam and set around the upper and lower through holes to reinforce the beam that has been weakened by the opening of the through holes.

[0032] A construction method for a spiral steel structure, utilizing through-beam prestressed cables 2, includes the following steps: S1. Erect a frame or construction scaffold to carry out the construction of the main spiral steel beam 1 structure, forming the main structure of the spiral steel beam 1 with the designed spatial geometry; S2. Calculate the weight of the structure and decoration of each area of ​​the spiral steel beam 1. Hang sandbags or other heavy objects of equal mass on the corresponding positions of the main structure of the spiral steel beam 1 to simulate the actual load distribution of the building and decoration. S3. The prestressed cable is constructed on the spiral steel beam 1 using the through-beam prestressed cable 2 construction method, so that the prestressed cable passes through the upper and lower through holes of the spiral steel beam 1 and is connected to the spiral steel beam 1. S4. Tension the prestressed tendons in the prestressed cables, and then remove the formwork or construction frame so that the structure can undergo a predetermined deformation and reach the design displacement state under the combined action of its own weight, suspended sandbags or other heavy objects and prestress. This state is defined as the initial state. S5. Based on the initial state, while removing sandbags or other heavy objects, carry out architectural decoration construction, add architectural and decorative features until the construction is completed, so that the structural displacement after the completion of construction is controlled within the design allowable range.

[0033] In step S2, medium-mass sandbags or other heavy objects are suspended in corresponding positions according to the calculated weight of the structure and decoration of each area of ​​the spiral steel beam 1, in order to simulate the actual load distribution of the building and decoration.

[0034] The construction method for the prestressed cable 2 through the beam in step S3 includes: At the prestressing insertion location of the spiral steel beam 1, prefabricate or process on-site the upper and lower through holes and positioning ring plate 5 nodes for installing the prestressing cable 2 structure through the beam; The prestressing tendons are threaded through the upper and lower through holes and connected to the internal thread of the positioning ring plate 5 to form several through-beam prestressing tendons; and adjacent prestressing tendons on the spiral steel beam 1 are connected by connectors so that the prestressing tendons are connected in sequence to form a continuous through-beam prestressing cable 2.

[0035] After tensioning the prestressed tendons and removing the jig or construction frame in step S4, the spiral steel structure reaches its initial state under the combined action of its own weight, suspended sandbags or other heavy objects, and prestress.

[0036] In step S5, by removing sandbags or other heavy objects and adding architectural and decorative elements, the overall displacement and torsional deformation of the spiral steel structure in its final use state are controlled within the design limits.

[0037] Example 2 See Figure 1 and 2 A type of through-beam prestressed cable 2 includes a beam body, prestressed tendons and connectors, with corresponding through holes on the upper and lower surfaces of the beam body; The positioning ring plate 5 is set around the upper and lower through holes of the beam body, used to reinforce the beam body at the through holes and serve as the connection interface for prestressed tendons. The inner wall of the positioning ring plate 5 is provided with internal threads. Several prestressed tendons that penetrate the upper and lower through holes of the beam and are threadedly connected to the internal threads of the positioning ring plate 5. And connecting pieces at the ends of adjacent prestressing tendons on the beam, so that several prestressing tendons are connected in sequence through the connecting pieces to form a through-beam prestressing cable 2.

[0038] The continuous prestressed cable system is arranged along the spiral path of the spiral steel beam 1.

[0039] The prestressing tendons are made of high-strength screws 6. The high-strength screws 6 are threaded to the positioning ring plate 5 through the internal thread on the inner wall of the positioning ring plate 5. The high-strength screws 6 are connected to the spiral steel beam 1 and the upper and lower positioning ring plates 5 to form a whole.

[0040] The two ends of the high-strength screw 6 are exposed beyond the outer side of the positioning ring plate 5 for a predetermined design length, and the exposed parts at both ends of the high-strength screw 6 are reserved with external threads.

[0041] The connector includes a pair of threaded connecting sleeves 4 that are respectively threaded to the external threads of the ends of adjacent prestressing tendons, and a connecting cable 3 connected between the pair of threaded connecting sleeves 4; The two ends of the connecting cable 3 are respectively hinged to the corresponding threaded connecting sleeve 4.

[0042] Positioning ring plate 5 is welded to the outer surface of the beam and set around the upper and lower through holes to reinforce the beam that has been weakened by the opening of the through holes.

[0043] The through-beam prestressed cable 2 structure of the present invention is applied to a large-span spatial spiral steel structure. The spiral steel beam 1 forms a spatial curve that twists and rises or sinks along the building space, and needs to work together with the overall structural system through the prestressed cable. In this embodiment, several corresponding through holes are opened on the upper and lower surfaces of the spiral steel beam 1 at a designed interval. A positioning ring plate 5 is welded to the upper and lower surfaces of the spiral steel beam 1 at each through hole position. The positioning ring plate 5 is arranged around the through hole and closely attached to the outer surface of the spiral steel beam 1. It is used to reinforce the beam body weakened by the opening of the through hole. The inner wall of the positioning ring plate 5 is machined with internal threads, which are used to connect with the prestressing tendons, thereby forming a rigid connection interface between the prestressing tendons and the spiral steel beam 1.

[0044] The prestressing tendons are made of high-strength screw rods 6. During installation, the high-strength screw rods 6 are inserted into the upper through hole from the upper side of the spiral steel beam 1, pass through the cross-sectional area of ​​the spiral steel beam 1, and exit from the lower through hole, so that the high-strength screw rods 6 pass through the upper and lower through holes. A certain exposed length is reserved at both ends of the high-strength screw rods 6 outside the positioning ring plate 5, and external threads are machined on the exposed part. By screwing in the connecting nut or directly engaging with the internal thread of the positioning ring plate 5, the high-strength screw rods 6 are threadedly connected to the internal threads of the upper and lower positioning ring plates 5, forming an integral load-bearing unit of "upper positioning ring plate 5 - spiral steel beam 1 - lower positioning ring plate 5 - high-strength screw rod 6".

[0045] Several high-strength screw rods 6 are arranged along the length of the spiral steel beam 1 as prestressing tendons. Adjacent prestressing tendons are connected by connectors, which include a pair of threaded connecting sleeves 4 and a connecting cable 3. The threaded connecting sleeves 4 are threaded to the external threaded sections at the ends of two adjacent high-strength screw rods 6. The connecting cable 3 spans between the two threaded connecting sleeves 4. The two ends of the connecting cable 3 are connected to the corresponding threaded connecting sleeves 4 through a hinge structure, so that the connecting cable 3 can deform accordingly with the spatial torsion and prestress adjustment of the spiral steel beam 1 without generating additional constraints.

[0046] Through the sequential arrangement of the high-strength screws 6 and connectors, a number of prestressing tendons are connected in sequence through the connectors to form a continuous through-beam prestressing cable 2. The through-beam prestressing cable 2 is arranged along the spiral steel beam 1, passing through the cross section of the spiral steel beam 1 and forming an integral connection with the beam body of the spiral steel beam 1 through the positioning ring plate 5, so that the prestress is reliably transmitted to the spiral steel beam 1 through the high-strength screws 6 and the positioning ring plate 5.

[0047] In this embodiment, the opening of the upper and lower through holes, the fabrication and welding of the positioning ring plate 5, and the processing of the internal threads on the inner wall of the positioning ring plate 5 are preferably prefabricated in the factory. The connecting parts are also processed and assembled in the factory. On site, it is only necessary to insert the high-strength screw 6 into the through hole and connect it to the positioning ring plate 5 by thread, and then install the threaded connecting sleeve 4 and the connecting cable 3 in sequence. The construction process is clear and the installation accuracy is high.

[0048] Example 3 See Figure 1 and 2 A construction method for a spiral steel structure, utilizing through-beam prestressed cables 2, includes the following steps: S1. Erect a frame or construction scaffold to carry out the construction of the main spiral steel beam 1 structure, forming the main structure of the spiral steel beam 1 with the designed spatial geometry; Based on the designed spatial geometry of the spiral steel structure, a scaffold or construction frame is erected on the construction site. The spiral steel beam 1 is then hoisted, welded, and installed in sections to form a continuous main structure of the spiral steel beam 1. At this point, the spiral steel beam 1 maintains its designed geometric shape under the support and constraint of the scaffold or construction frame.

[0049] S2. Calculate the weight of the structure and decoration of each area of ​​the spiral steel beam 1. Hang sandbags or other heavy objects of equal mass on the corresponding positions of the main structure of the spiral steel beam 1 to simulate the actual load distribution of the building and decoration. Based on the architectural structure and decorative features of each area of ​​the spiral steel beam 1, the self-weight and decorative loads of each area under future use conditions are calculated. According to the calculation results, sandbags or other heavy objects of equal mass are suspended at corresponding positions on the main structure of the spiral steel beam 1, ensuring that the size and distribution of the suspended weights correspond to the actual load distribution of the future architectural structure and decorative features. This step introduces simulated loads in advance while the spiral steel beam 1 is still supported by a formwork, providing a foundation for subsequent prestressing tensioning and structural deformation control.

[0050] S3. The prestressed cable is constructed on the spiral steel beam 1 using the through-beam prestressed cable 2 construction method, so that the prestressed cable passes through the upper and lower through holes of the spiral steel beam 1 and is connected to the spiral steel beam 1. Corresponding through holes are made on the upper and lower surfaces of the spiral steel beam 1 according to design requirements. Positioning ring plates 5 are welded around the through holes, and internal threads are machined on the inner wall of the positioning ring plates 5. Then, high-strength screw rods 6 are used as prestressing tendons, sequentially passing through the upper and lower through holes, exposing both ends of the high-strength screw rods 6 with pre-drilled external threads. The high-strength screw rods 6 are connected to the internal threads of the upper and lower positioning ring plates 5 through threaded engagement, forming several through-beam prestressing tendons. A pair of threaded connecting sleeves 4 are then threaded onto the external threaded sections at the ends of two adjacent high-strength screw rods 6. A connecting cable 3 is used to bridge the two threaded connecting sleeves 4, with both ends of the connecting cable 3 hinged to the threaded connecting sleeves 4. This allows several high-strength screw rods 6 to be sequentially connected through connectors to form a continuous through-beam prestressing cable 2. This through-beam prestressing cable 2 is arranged along the spiral steel beam 1 and is integrally connected to the spiral steel beam 1 through the positioning ring plates 5.

[0051] S4. Tension the prestressed tendons in the prestressed cables, and then remove the formwork or construction frame so that the structure can undergo a predetermined deformation and reach the design displacement state under the combined action of its own weight, suspended sandbags or other heavy objects and prestress. This state is defined as the initial state. After the installation of the through-beam prestressed cable 2 is completed, while the spiral steel beam 1 is still supported by the support frame and the suspended sandbags or other heavy objects are in place, a predetermined prestress is applied to the high-strength bolts 6 in the through-beam prestressed cable 2. The prestress is adjusted to the design value using methods such as staged tensioning. After the prestressing is completed, the support of the support frame or construction scaffold is gradually removed, so that the spiral steel structure bears the load solely through its own stiffness, the through-beam prestressed cable 2, and the suspended sandbags or other heavy objects. In this stage, the reverse deformation generated by the prestressing, together with the deformation generated by the simulated building and decoration loads, causes the spiral steel structure to reach a predetermined displacement state, which is defined as the initial state. In the initial state, the overall torsion and deflection of the spiral steel structure meet the needs of subsequent decoration construction.

[0052] S5. Based on the initial state, while removing sandbags or other heavy objects, carry out architectural and decorative construction, add architectural and decorative methods until the construction is completed, so that the structural displacement after the construction is completed is controlled within the design allowable range. In the initial stage of the structure, sandbags or other heavy objects suspended from the spiral steel beam 1 are removed, while architectural decoration construction is carried out on the spiral steel beam 1, gradually applying actual architectural and decorative loads. As the sandbags or other heavy objects are removed and the actual decorative loads gradually increase, the stress state of the spiral steel structure gradually transitions from "prestress + self-weight + simulated weight" to "prestress + self-weight + actual decorative loads". By reasonably setting the magnitude of the prestress and the substitution process between simulated loads and actual decorative loads, the overall displacement and torsional deformation of the spiral steel structure in the final service state are controlled within the design allowable range, thereby ensuring that the structural geometry and architectural effect meet the design objectives.

[0053] In step S2, medium-mass sandbags or other heavy objects are suspended in corresponding positions according to the calculated weight of the structure and decoration of each area of ​​the spiral steel beam 1, in order to simulate the actual load distribution of the building and decoration.

[0054] The construction method for the prestressed cable 2 through the beam in step S3 includes: At the prestressing insertion location of the spiral steel beam 1, prefabricate or process on-site the upper and lower through holes and positioning ring plate 5 nodes for installing the prestressing cable 2 structure through the beam; The prestressing tendons are threaded through the upper and lower through holes and connected to the internal thread of the positioning ring plate 5 to form several through-beam prestressing tendons; and adjacent prestressing tendons on the spiral steel beam 1 are connected by connectors so that the prestressing tendons are connected in sequence to form a continuous through-beam prestressing cable 2.

[0055] After tensioning the prestressed tendons and removing the jig or construction frame in step S4, the spiral steel structure reaches its initial state under the combined action of its own weight, suspended sandbags or other heavy objects, and prestress.

[0056] In step S5, by removing sandbags or other heavy objects and adding architectural and decorative elements, the overall displacement and torsional deformation of the spiral steel structure in its final use state are controlled within the design limits.

[0057] Through the above implementation methods, the present invention utilizes the through-beam prestressed cable 2 structure to achieve reliable force transmission between prestress and spiral steel beam 1, and achieves active control of the overall deformation of the spiral steel structure through the construction sequence of "suspending equal mass weights - prestressing tensioning - forming the initial state - decorative load replacement".

[0058] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A prestressed tendon for beams, comprising a beam body, prestressed tendons, and connectors, characterized in that, The upper and lower surfaces of the beam are provided with corresponding through holes. A positioning ring plate is disposed around the upper and lower through holes of the beam body, used to reinforce the beam body at the through holes and serve as the connection interface for prestressed tendons. The inner wall of the positioning ring plate is provided with internal threads. A number of prestressed tendons that pass through the upper and lower through holes of the beam and are threadedly connected to the internal thread of the positioning ring plate. And a connector that connects the ends of adjacent prestressing tendons on the beam, so that several prestressing tendons are connected sequentially through the connector to form a through-beam prestressing cable.

2. The through-beam prestressed cable according to claim 1, characterized in that, The beam is a spatially spirally arranged spiral steel beam, and the continuous prestressed cable system is arranged along the spiral path of the spiral steel beam.

3. The through-beam prestressed cable according to claim 1, characterized in that, The prestressing tendon is made of high-strength screw, which is threaded to the positioning ring plate through the internal thread on the inner wall of the positioning ring plate. The high-strength screw is integrated with the spiral steel beam and the upper and lower positioning ring plates. The two ends of the high-strength screw are exposed beyond the outer side of the positioning ring plate by a predetermined design length, and the exposed portions at both ends of the high-strength screw are reserved with external threads.

4. The through-beam prestressed cable according to claim 1, characterized in that, The connector includes a pair of threaded connecting sleeves that are respectively threaded to the external threads of the ends of adjacent prestressing tendons, and a connecting cable connected between the pair of threaded connecting sleeves; The two ends of the connecting cable are respectively hinged to the corresponding threaded connecting sleeves.

5. The through-beam prestressed cable according to claim 1, characterized in that, The positioning ring plate is welded to the outer surface of the beam and surrounds the upper and lower through holes. This is to reinforce the beam that has been weakened by the through holes.

6. A construction method for a spiral steel structure, characterized in that, The method of using the through-beam prestressed cable structure as described in any one of claims 1 to 5 includes the following steps: S1. Erect a formwork or construction frame to carry out the construction of the main spiral steel beam structure, forming the main spiral steel beam structure with the designed spatial geometry; S2. Calculate the weight of the structure and decoration of each area of ​​the spiral steel beam, and suspend sandbags or other heavy objects of equal mass at the corresponding positions on the main structure of the spiral steel beam to simulate the actual load distribution of the building and decoration. S3. The prestressed cable is constructed on the spiral steel beam using the through-beam prestressed cable construction method, so that the prestressed cable passes through the upper and lower through holes of the spiral steel beam and is connected to the spiral steel beam. S4. Tension the prestressed tendons in the prestressed cable, and then remove the formwork or construction frame, so that the structure can produce a predetermined deformation and reach the design displacement state under the combined action of its own weight, suspended sandbags or other heavy objects and prestress. This state is defined as the initial state. S5. Based on the initial state, while removing the sandbags or other heavy objects, carry out building decoration construction, add building and decoration methods until the construction is completed, so that the structural displacement after the construction is completed is controlled within the design allowable range.

7. The construction method for the spiral steel structure according to claim 6, characterized in that, In step S2, sandbags or other heavy objects of equal mass are suspended in corresponding positions according to the calculated weight of the structure and decoration of each area of ​​the spiral steel beam, in order to simulate the actual load distribution of the building and decoration.

8. The construction method of the spiral steel structure according to claim 7, characterized in that, The prestressed cable construction method for beams described in step S3 includes: At the prestressing insertion location of the spiral steel beam, prefabricate or process on-site the upper and lower through holes and positioning ring plate nodes for installing the through-beam prestressed cable structure; The prestressing tendons are threaded through the upper and lower through holes and connected to the internal thread of the positioning ring plate to form a plurality of through-beam prestressing tendons; and adjacent prestressing tendons on the spiral steel beam are connected by connectors so that the prestressing tendons are connected in sequence to form a continuous through-beam prestressing cable.

9. The construction method of the spiral steel structure according to claim 8, characterized in that, After the prestressed tendons are tensioned and the jig or construction frame is removed in step S4, the spiral steel structure reaches the initial state under the combined action of its own weight, suspended sandbags or other heavy objects, and prestress.

10. The construction method of the spiral steel structure according to claim 9, characterized in that, In step S5, by removing the sandbags or other heavy objects and adding architectural and decorative elements, the overall displacement and torsional deformation of the spiral steel structure in its final use state are controlled within the design limits.

Images